scripts/checkpatch.pl

   1 #!/usr/bin/env perl
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # (c) 2001, Dave Jones. (the file handling bit)
   5 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
   6 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
   7 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
   8 # (c) 2010-2018 Joe Perches <joe@perches.com>
   9
  10 use strict;
  11 use warnings;
  12 use POSIX;
  13 use File::Basename;
  14 use Cwd 'abs_path';
  15 use Term::ANSIColor qw(:constants);
  16 use Encode qw(decode encode);
  17
  18 my $P = $0;
  19 my $D = dirname(abs_path($P));
  20
  21 my $V = '0.32';
  22
  23 use Getopt::Long qw(:config no_auto_abbrev);
  24
  25 my $quiet = 0;
  26 my $verbose = 0;
  27 my %verbose_messages = ();
  28 my %verbose_emitted = ();
  29 my $tree = 1;
  30 my $chk_signoff = 1;
  31 my $chk_patch = 1;
  32 my $tst_only;
  33 my $emacs = 0;
  34 my $terse = 0;
  35 my $showfile = 0;
  36 my $file = 0;
  37 my $git = 0;
  38 my %git_commits = ();
  39 my $check = 0;
  40 my $check_orig = 0;
  41 my $summary = 1;
  42 my $mailback = 0;
  43 my $summary_file = 0;
  44 my $show_types = 0;
  45 my $list_types = 0;
  46 my $fix = 0;
  47 my $fix_inplace = 0;
  48 my $root;
  49 my $gitroot = $ENV{'GIT_DIR'};
  50 $gitroot = ".git" if !defined($gitroot);
  51 my %debug;
  52 my %camelcase = ();
  53 my %use_type = ();
  54 my @use = ();
  55 my %ignore_type = ();
  56 my @ignore = ();
  57 my $help = 0;
  58 my $configuration_file = ".checkpatch.conf";
  59 my $max_line_length = 100;
  60 my $ignore_perl_version = 0;
  61 my $minimum_perl_version = 5.10.0;
  62 my $min_conf_desc_length = 4;
  63 my $spelling_file = "$D/spelling.txt";
  64 my $codespell = 0;
  65 my $codespellfile = "/usr/share/codespell/dictionary.txt";
  66 my $user_codespellfile = "";
  67 my $conststructsfile = "$D/const_structs.checkpatch";
  68 my $u_boot = 0;
  69 my $docsfile = "$D/../doc/develop/checkpatch.rst";
  70 my $typedefsfile;
  71 my $color = "auto";
  72 my $allow_c99_comments = 1; # Can be overridden by --ignore C99_COMMENT_TOLERANCE
  73 # git output parsing needs US English output, so first set backtick child process LANGUAGE
  74 my $git_command ='export LANGUAGE=en_US.UTF-8; git';
  75 my $tabsize = 8;
  76 my ${CONFIG_} = "CONFIG_";
  77
  78 sub help {
  79         my ($exitcode) = @_;
  80
  81         print << "EOM";
  82 Usage: $P [OPTION]... [FILE]...
  83 Version: $V
  84
  85 Options:
  86   -q, --quiet                quiet
  87   -v, --verbose              verbose mode
  88   --no-tree                  run without a kernel tree
  89   --no-signoff               do not check for 'Signed-off-by' line
  90   --patch                    treat FILE as patchfile (default)
  91   --emacs                    emacs compile window format
  92   --terse                    one line per report
  93   --showfile                 emit diffed file position, not input file position
  94   -g, --git                  treat FILE as a single commit or git revision range
  95                              single git commit with:
  96                                <rev>
  97                                <rev>^
  98                                <rev>~n
  99                              multiple git commits with:
 100                                <rev1>..<rev2>
 101                                <rev1>...<rev2>
 102                                <rev>-<count>
 103                              git merges are ignored
 104   -f, --file                 treat FILE as regular source file
 105   --subjective, --strict     enable more subjective tests
 106   --list-types               list the possible message types
 107   --types TYPE(,TYPE2...)    show only these comma separated message types
 108   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
 109   --show-types               show the specific message type in the output
 110   --max-line-length=n        set the maximum line length, (default $max_line_length)
 111                              if exceeded, warn on patches
 112                              requires --strict for use with --file
 113   --min-conf-desc-length=n   set the min description length, if shorter, warn
 114   --tab-size=n               set the number of spaces for tab (default $tabsize)
 115   --root=PATH                PATH to the kernel tree root
 116   --no-summary               suppress the per-file summary
 117   --mailback                 only produce a report in case of warnings/errors
 118   --summary-file             include the filename in summary
 119   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
 120                              'values', 'possible', 'type', and 'attr' (default
 121                              is all off)
 122   --test-only=WORD           report only warnings/errors containing WORD
 123                              literally
 124   --fix                      EXPERIMENTAL - may create horrible results
 125                              If correctable single-line errors exist, create
 126                              "<inputfile>.EXPERIMENTAL-checkpatch-fixes"
 127                              with potential errors corrected to the preferred
 128                              checkpatch style
 129   --fix-inplace              EXPERIMENTAL - may create horrible results
 130                              Is the same as --fix, but overwrites the input
 131                              file.  It's your fault if there's no backup or git
 132   --ignore-perl-version      override checking of perl version.  expect
 133                              runtime errors.
 134   --codespell                Use the codespell dictionary for spelling/typos
 135                              (default:$codespellfile)
 136   --codespellfile            Use this codespell dictionary
 137   --typedefsfile             Read additional types from this file
 138   --color[=WHEN]             Use colors 'always', 'never', or only when output
 139                              is a terminal ('auto'). Default is 'auto'.
 140   --u-boot                   Run additional checks for U-Boot
 141   --kconfig-prefix=WORD      use WORD as a prefix for Kconfig symbols (default
 142                              ${CONFIG_})
 143   -h, --help, --version      display this help and exit
 144
 145 When FILE is - read standard input.
 146 EOM
 147
 148         exit($exitcode);
 149 }
 150
 151 sub uniq {
 152         my %seen;
 153         return grep { !$seen{$_}++ } @_;
 154 }
 155
 156 sub list_types {
 157         my ($exitcode) = @_;
 158
 159         my $count = 0;
 160
 161         local $/ = undef;
 162
 163         open(my $script, '<', abs_path($P)) or
 164             die "$P: Can't read '$P' $!\n";
 165
 166         my $text = <$script>;
 167         close($script);
 168
 169         my %types = ();
 170         # Also catch when type or level is passed through a variable
 171         while ($text =~ /(?:(\bCHK|\bWARN|\bERROR|&\{\$msg_level})\s*\(|\$msg_type\s*=)\s*"([^"]+)"/g) {
 172                 if (defined($1)) {
 173                         if (exists($types{$2})) {
 174                                 $types{$2} .= ",$1" if ($types{$2} ne $1);
 175                         } else {
 176                                 $types{$2} = $1;
 177                         }
 178                 } else {
 179                         $types{$2} = "UNDETERMINED";
 180                 }
 181         }
 182
 183         print("#\tMessage type\n\n");
 184         if ($color) {
 185                 print(" ( Color coding: ");
 186                 print(RED . "ERROR" . RESET);
 187                 print(" | ");
 188                 print(YELLOW . "WARNING" . RESET);
 189                 print(" | ");
 190                 print(GREEN . "CHECK" . RESET);
 191                 print(" | ");
 192                 print("Multiple levels / Undetermined");
 193                 print(" )\n\n");
 194         }
 195
 196         foreach my $type (sort keys %types) {
 197                 my $orig_type = $type;
 198                 if ($color) {
 199                         my $level = $types{$type};
 200                         if ($level eq "ERROR") {
 201                                 $type = RED . $type . RESET;
 202                         } elsif ($level eq "WARN") {
 203                                 $type = YELLOW . $type . RESET;
 204                         } elsif ($level eq "CHK") {
 205                                 $type = GREEN . $type . RESET;
 206                         }
 207                 }
 208                 print(++$count . "\t" . $type . "\n");
 209                 if ($verbose && exists($verbose_messages{$orig_type})) {
 210                         my $message = $verbose_messages{$orig_type};
 211                         $message =~ s/\n/\n\t/g;
 212                         print("\t" . $message . "\n\n");
 213                 }
 214         }
 215
 216         exit($exitcode);
 217 }
 218
 219 my $conf = which_conf($configuration_file);
 220 if (-f $conf) {
 221         my @conf_args;
 222         open(my $conffile, '<', "$conf")
 223             or warn "$P: Can't find a readable $configuration_file file $!\n";
 224
 225         while (<$conffile>) {
 226                 my $line = $_;
 227
 228                 $line =~ s/\s*\n?$//g;
 229                 $line =~ s/^\s*//g;
 230                 $line =~ s/\s+/ /g;
 231
 232                 next if ($line =~ m/^\s*#/);
 233                 next if ($line =~ m/^\s*$/);
 234
 235                 my @words = split(" ", $line);
 236                 foreach my $word (@words) {
 237                         last if ($word =~ m/^#/);
 238                         push (@conf_args, $word);
 239                 }
 240         }
 241         close($conffile);
 242         unshift(@ARGV, @conf_args) if @conf_args;
 243 }
 244
 245 sub load_docs {
 246         open(my $docs, '<', "$docsfile")
 247             or warn "$P: Can't read the documentation file $docsfile $!\n";
 248
 249         my $type = '';
 250         my $desc = '';
 251         my $in_desc = 0;
 252
 253         while (<$docs>) {
 254                 chomp;
 255                 my $line = $_;
 256                 $line =~ s/\s+$//;
 257
 258                 if ($line =~ /^\s*\*\*(.+)\*\*$/) {
 259                         if ($desc ne '') {
 260                                 $verbose_messages{$type} = trim($desc);
 261                         }
 262                         $type = $1;
 263                         $desc = '';
 264                         $in_desc = 1;
 265                 } elsif ($in_desc) {
 266                         if ($line =~ /^(?:\s{4,}|$)/) {
 267                                 $line =~ s/^\s{4}//;
 268                                 $desc .= $line;
 269                                 $desc .= "\n";
 270                         } else {
 271                                 $verbose_messages{$type} = trim($desc);
 272                                 $type = '';
 273                                 $desc = '';
 274                                 $in_desc = 0;
 275                         }
 276                 }
 277         }
 278
 279         if ($desc ne '') {
 280                 $verbose_messages{$type} = trim($desc);
 281         }
 282         close($docs);
 283 }
 284
 285 # Perl's Getopt::Long allows options to take optional arguments after a space.
 286 # Prevent --color by itself from consuming other arguments
 287 foreach (@ARGV) {
 288         if ($_ eq "--color" || $_ eq "-color") {
 289                 $_ = "--color=$color";
 290         }
 291 }
 292
 293 GetOptions(
 294         'q|quiet+'      => \$quiet,
 295         'v|verbose!'    => \$verbose,
 296         'tree!'         => \$tree,
 297         'signoff!'      => \$chk_signoff,
 298         'patch!'        => \$chk_patch,
 299         'emacs!'        => \$emacs,
 300         'terse!'        => \$terse,
 301         'showfile!'     => \$showfile,
 302         'f|file!'       => \$file,
 303         'g|git!'        => \$git,
 304         'subjective!'   => \$check,
 305         'strict!'       => \$check,
 306         'ignore=s'      => \@ignore,
 307         'types=s'       => \@use,
 308         'show-types!'   => \$show_types,
 309         'list-types!'   => \$list_types,
 310         'max-line-length=i' => \$max_line_length,
 311         'min-conf-desc-length=i' => \$min_conf_desc_length,
 312         'tab-size=i'    => \$tabsize,
 313         'root=s'        => \$root,
 314         'summary!'      => \$summary,
 315         'mailback!'     => \$mailback,
 316         'summary-file!' => \$summary_file,
 317         'fix!'          => \$fix,
 318         'fix-inplace!'  => \$fix_inplace,
 319         'ignore-perl-version!' => \$ignore_perl_version,
 320         'debug=s'       => \%debug,
 321         'test-only=s'   => \$tst_only,
 322         'codespell!'    => \$codespell,
 323         'codespellfile=s'       => \$user_codespellfile,
 324         'typedefsfile=s'        => \$typedefsfile,
 325         'u-boot'        => \$u_boot,
 326         'color=s'       => \$color,
 327         'no-color'      => \$color,     #keep old behaviors of -nocolor
 328         'nocolor'       => \$color,     #keep old behaviors of -nocolor
 329         'kconfig-prefix=s'      => \${CONFIG_},
 330         'h|help'        => \$help,
 331         'version'       => \$help
 332 ) or $help = 2;
 333
 334 if ($user_codespellfile) {
 335         # Use the user provided codespell file unconditionally
 336         $codespellfile = $user_codespellfile;
 337 } elsif (!(-f $codespellfile)) {
 338         # If /usr/share/codespell/dictionary.txt is not present, try to find it
 339         # under codespell's install directory: <codespell_root>/data/dictionary.txt
 340         if (($codespell || $help) && which("codespell") ne "" && which("python") ne "") {
 341                 my $python_codespell_dict = << "EOF";
 342
 343 import os.path as op
 344 import codespell_lib
 345 codespell_dir = op.dirname(codespell_lib.__file__)
 346 codespell_file = op.join(codespell_dir, 'data', 'dictionary.txt')
 347 print(codespell_file, end='')
 348 EOF
 349
 350                 my $codespell_dict = `python -c "$python_codespell_dict" 2> /dev/null`;
 351                 $codespellfile = $codespell_dict if (-f $codespell_dict);
 352         }
 353 }
 354
 355 # $help is 1 if either -h, --help or --version is passed as option - exitcode: 0
 356 # $help is 2 if invalid option is passed - exitcode: 1
 357 help($help - 1) if ($help);
 358
 359 die "$P: --git cannot be used with --file or --fix\n" if ($git && ($file || $fix));
 360 die "$P: --verbose cannot be used with --terse\n" if ($verbose && $terse);
 361
 362 if ($color =~ /^[01]$/) {
 363         $color = !$color;
 364 } elsif ($color =~ /^always$/i) {
 365         $color = 1;
 366 } elsif ($color =~ /^never$/i) {
 367         $color = 0;
 368 } elsif ($color =~ /^auto$/i) {
 369         $color = (-t STDOUT);
 370 } else {
 371         die "$P: Invalid color mode: $color\n";
 372 }
 373
 374 load_docs() if ($verbose);
 375 list_types(0) if ($list_types);
 376
 377 $fix = 1 if ($fix_inplace);
 378 $check_orig = $check;
 379
 380 my $exit = 0;
 381
 382 my $perl_version_ok = 1;
 383 if ($^V && $^V lt $minimum_perl_version) {
 384         $perl_version_ok = 0;
 385         printf "$P: requires at least perl version %vd\n", $minimum_perl_version;
 386         exit(1) if (!$ignore_perl_version);
 387 }
 388
 389 #if no filenames are given, push '-' to read patch from stdin
 390 if ($#ARGV < 0) {
 391         push(@ARGV, '-');
 392 }
 393
 394 # skip TAB size 1 to avoid additional checks on $tabsize - 1
 395 die "$P: Invalid TAB size: $tabsize\n" if ($tabsize < 2);
 396
 397 sub hash_save_array_words {
 398         my ($hashRef, $arrayRef) = @_;
 399
 400         my @array = split(/,/, join(',', @$arrayRef));
 401         foreach my $word (@array) {
 402                 $word =~ s/\s*\n?$//g;
 403                 $word =~ s/^\s*//g;
 404                 $word =~ s/\s+/ /g;
 405                 $word =~ tr/[a-z]/[A-Z]/;
 406
 407                 next if ($word =~ m/^\s*#/);
 408                 next if ($word =~ m/^\s*$/);
 409
 410                 $hashRef->{$word}++;
 411         }
 412 }
 413
 414 sub hash_show_words {
 415         my ($hashRef, $prefix) = @_;
 416
 417         if (keys %$hashRef) {
 418                 print "\nNOTE: $prefix message types:";
 419                 foreach my $word (sort keys %$hashRef) {
 420                         print " $word";
 421                 }
 422                 print "\n";
 423         }
 424 }
 425
 426 hash_save_array_words(\%ignore_type, \@ignore);
 427 hash_save_array_words(\%use_type, \@use);
 428
 429 my $dbg_values = 0;
 430 my $dbg_possible = 0;
 431 my $dbg_type = 0;
 432 my $dbg_attr = 0;
 433 for my $key (keys %debug) {
 434         ## no critic
 435         eval "\${dbg_$key} = '$debug{$key}';";
 436         die "$@" if ($@);
 437 }
 438
 439 my $rpt_cleaners = 0;
 440
 441 if ($terse) {
 442         $emacs = 1;
 443         $quiet++;
 444 }
 445
 446 if ($tree) {
 447         if (defined $root) {
 448                 if (!top_of_kernel_tree($root)) {
 449                         die "$P: $root: --root does not point at a valid tree\n";
 450                 }
 451         } else {
 452                 if (top_of_kernel_tree('.')) {
 453                         $root = '.';
 454                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 455                                                 top_of_kernel_tree($1)) {
 456                         $root = $1;
 457                 }
 458         }
 459
 460         if (!defined $root) {
 461                 print "Must be run from the top-level dir. of a kernel tree\n";
 462                 exit(2);
 463         }
 464 }
 465
 466 my $emitted_corrupt = 0;
 467
 468 our $Ident      = qr{
 469                         [A-Za-z_][A-Za-z\d_]*
 470                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 471                 }x;
 472 our $Storage    = qr{extern|static|asmlinkage};
 473 our $Sparse     = qr{
 474                         __user|
 475                         __kernel|
 476                         __force|
 477                         __iomem|
 478                         __must_check|
 479                         __kprobes|
 480                         __ref|
 481                         __refconst|
 482                         __refdata|
 483                         __rcu|
 484                         __private
 485                 }x;
 486 our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)};
 487 our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)};
 488 our $InitAttributeConst = qr{$InitAttributePrefix(?:initconst\b)};
 489 our $InitAttributeInit = qr{$InitAttributePrefix(?:init\b)};
 490 our $InitAttribute = qr{$InitAttributeData|$InitAttributeConst|$InitAttributeInit};
 491
 492 # Notes to $Attribute:
 493 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 494 our $Attribute  = qr{
 495                         const|
 496                         volatile|
 497                         __percpu|
 498                         __nocast|
 499                         __safe|
 500                         __bitwise|
 501                         __packed__|
 502                         __packed2__|
 503                         __naked|
 504                         __maybe_unused|
 505                         __always_unused|
 506                         __noreturn|
 507                         __used|
 508                         __cold|
 509                         __pure|
 510                         __noclone|
 511                         __deprecated|
 512                         __read_mostly|
 513                         __ro_after_init|
 514                         __kprobes|
 515                         $InitAttribute|
 516                         ____cacheline_aligned|
 517                         ____cacheline_aligned_in_smp|
 518                         ____cacheline_internodealigned_in_smp|
 519                         __weak|
 520                         __alloc_size\s*\(\s*\d+\s*(?:,\s*\d+\s*)?\)
 521                   }x;
 522 our $Modifier;
 523 our $Inline     = qr{inline|__always_inline|noinline|__inline|__inline__};
 524 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 525 our $Lval       = qr{$Ident(?:$Member)*};
 526
 527 our $Int_type   = qr{(?i)llu|ull|ll|lu|ul|l|u};
 528 our $Binary     = qr{(?i)0b[01]+$Int_type?};
 529 our $Hex        = qr{(?i)0x[0-9a-f]+$Int_type?};
 530 our $Int        = qr{[0-9]+$Int_type?};
 531 our $Octal      = qr{0[0-7]+$Int_type?};
 532 our $String     = qr{(?:\b[Lu])?"[X\t]*"};
 533 our $Float_hex  = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 534 our $Float_dec  = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 535 our $Float_int  = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
 536 our $Float      = qr{$Float_hex|$Float_dec|$Float_int};
 537 our $Constant   = qr{$Float|$Binary|$Octal|$Hex|$Int};
 538 our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
 539 our $Compare    = qr{<=|>=|==|!=|<|(?<!-)>};
 540 our $Arithmetic = qr{\+|-|\*|\/|%};
 541 our $Operators  = qr{
 542                         <=|>=|==|!=|
 543                         =>|->|<<|>>|<|>|!|~|
 544                         &&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
 545                   }x;
 546
 547 our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x;
 548
 549 our $BasicType;
 550 our $NonptrType;
 551 our $NonptrTypeMisordered;
 552 our $NonptrTypeWithAttr;
 553 our $Type;
 554 our $TypeMisordered;
 555 our $Declare;
 556 our $DeclareMisordered;
 557
 558 our $NON_ASCII_UTF8     = qr{
 559         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 560         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 561         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 562         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 563         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 564         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 565         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 566 }x;
 567
 568 our $UTF8       = qr{
 569         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 570         | $NON_ASCII_UTF8
 571 }x;
 572
 573 our $typeC99Typedefs = qr{(?:__)?(?:[us]_?)?int_?(?:8|16|32|64)_t};
 574 our $typeOtherOSTypedefs = qr{(?x:
 575         u_(?:char|short|int|long) |          # bsd
 576         u(?:nchar|short|int|long)            # sysv
 577 )};
 578 our $typeKernelTypedefs = qr{(?x:
 579         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 580         atomic_t
 581 )};
 582 our $typeTypedefs = qr{(?x:
 583         $typeC99Typedefs\b|
 584         $typeOtherOSTypedefs\b|
 585         $typeKernelTypedefs\b
 586 )};
 587
 588 our $zero_initializer = qr{(?:(?:0[xX])?0+$Int_type?|NULL|false)\b};
 589
 590 our $logFunctions = qr{(?x:
 591         printk(?:_ratelimited|_once|_deferred_once|_deferred|)|
 592         (?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 593         TP_printk|
 594         WARN(?:_RATELIMIT|_ONCE|)|
 595         panic|
 596         debug|
 597         printf|
 598         MODULE_[A-Z_]+|
 599         seq_vprintf|seq_printf|seq_puts
 600 )};
 601
 602 our $allocFunctions = qr{(?x:
 603         (?:(?:devm_)?
 604                 (?:kv|k|v)[czm]alloc(?:_array)?(?:_node)? |
 605                 kstrdup(?:_const)? |
 606                 kmemdup(?:_nul)?) |
 607         (?:\w+)?alloc_skb(?:_ip_align)? |
 608                                 # dev_alloc_skb/netdev_alloc_skb, et al
 609         dma_alloc_coherent
 610 )};
 611
 612 our $signature_tags = qr{(?xi:
 613         Signed-off-by:|
 614         Co-developed-by:|
 615         Acked-by:|
 616         Tested-by:|
 617         Reviewed-by:|
 618         Reported-by:|
 619         Suggested-by:|
 620         To:|
 621         Cc:
 622 )};
 623
 624 our $tracing_logging_tags = qr{(?xi:
 625         [=-]*> |
 626         <[=-]* |
 627         \[ |
 628         \] |
 629         start |
 630         called |
 631         entered |
 632         entry |
 633         enter |
 634         in |
 635         inside |
 636         here |
 637         begin |
 638         exit |
 639         end |
 640         done |
 641         leave |
 642         completed |
 643         out |
 644         return |
 645         [\.\!:\s]*
 646 )};
 647
 648 sub edit_distance_min {
 649         my (@arr) = @_;
 650         my $len = scalar @arr;
 651         if ((scalar @arr) < 1) {
 652                 # if underflow, return
 653                 return;
 654         }
 655         my $min = $arr[0];
 656         for my $i (0 .. ($len-1)) {
 657                 if ($arr[$i] < $min) {
 658                         $min = $arr[$i];
 659                 }
 660         }
 661         return $min;
 662 }
 663
 664 sub get_edit_distance {
 665         my ($str1, $str2) = @_;
 666         $str1 = lc($str1);
 667         $str2 = lc($str2);
 668         $str1 =~ s/-//g;
 669         $str2 =~ s/-//g;
 670         my $len1 = length($str1);
 671         my $len2 = length($str2);
 672         # two dimensional array storing minimum edit distance
 673         my @distance;
 674         for my $i (0 .. $len1) {
 675                 for my $j (0 .. $len2) {
 676                         if ($i == 0) {
 677                                 $distance[$i][$j] = $j;
 678                         } elsif ($j == 0) {
 679                                 $distance[$i][$j] = $i;
 680                         } elsif (substr($str1, $i-1, 1) eq substr($str2, $j-1, 1)) {
 681                                 $distance[$i][$j] = $distance[$i - 1][$j - 1];
 682                         } else {
 683                                 my $dist1 = $distance[$i][$j - 1]; #insert distance
 684                                 my $dist2 = $distance[$i - 1][$j]; # remove
 685                                 my $dist3 = $distance[$i - 1][$j - 1]; #replace
 686                                 $distance[$i][$j] = 1 + edit_distance_min($dist1, $dist2, $dist3);
 687                         }
 688                 }
 689         }
 690         return $distance[$len1][$len2];
 691 }
 692
 693 sub find_standard_signature {
 694         my ($sign_off) = @_;
 695         my @standard_signature_tags = (
 696                 'Signed-off-by:', 'Co-developed-by:', 'Acked-by:', 'Tested-by:',
 697                 'Reviewed-by:', 'Reported-by:', 'Suggested-by:'
 698         );
 699         foreach my $signature (@standard_signature_tags) {
 700                 return $signature if (get_edit_distance($sign_off, $signature) <= 2);
 701         }
 702
 703         return "";
 704 }
 705
 706 our @typeListMisordered = (
 707         qr{char\s+(?:un)?signed},
 708         qr{int\s+(?:(?:un)?signed\s+)?short\s},
 709         qr{int\s+short(?:\s+(?:un)?signed)},
 710         qr{short\s+int(?:\s+(?:un)?signed)},
 711         qr{(?:un)?signed\s+int\s+short},
 712         qr{short\s+(?:un)?signed},
 713         qr{long\s+int\s+(?:un)?signed},
 714         qr{int\s+long\s+(?:un)?signed},
 715         qr{long\s+(?:un)?signed\s+int},
 716         qr{int\s+(?:un)?signed\s+long},
 717         qr{int\s+(?:un)?signed},
 718         qr{int\s+long\s+long\s+(?:un)?signed},
 719         qr{long\s+long\s+int\s+(?:un)?signed},
 720         qr{long\s+long\s+(?:un)?signed\s+int},
 721         qr{long\s+long\s+(?:un)?signed},
 722         qr{long\s+(?:un)?signed},
 723 );
 724
 725 our @typeList = (
 726         qr{void},
 727         qr{(?:(?:un)?signed\s+)?char},
 728         qr{(?:(?:un)?signed\s+)?short\s+int},
 729         qr{(?:(?:un)?signed\s+)?short},
 730         qr{(?:(?:un)?signed\s+)?int},
 731         qr{(?:(?:un)?signed\s+)?long\s+int},
 732         qr{(?:(?:un)?signed\s+)?long\s+long\s+int},
 733         qr{(?:(?:un)?signed\s+)?long\s+long},
 734         qr{(?:(?:un)?signed\s+)?long},
 735         qr{(?:un)?signed},
 736         qr{float},
 737         qr{double},
 738         qr{bool},
 739         qr{struct\s+$Ident},
 740         qr{union\s+$Ident},
 741         qr{enum\s+$Ident},
 742         qr{${Ident}_t},
 743         qr{${Ident}_handler},
 744         qr{${Ident}_handler_fn},
 745         @typeListMisordered,
 746 );
 747
 748 our $C90_int_types = qr{(?x:
 749         long\s+long\s+int\s+(?:un)?signed|
 750         long\s+long\s+(?:un)?signed\s+int|
 751         long\s+long\s+(?:un)?signed|
 752         (?:(?:un)?signed\s+)?long\s+long\s+int|
 753         (?:(?:un)?signed\s+)?long\s+long|
 754         int\s+long\s+long\s+(?:un)?signed|
 755         int\s+(?:(?:un)?signed\s+)?long\s+long|
 756
 757         long\s+int\s+(?:un)?signed|
 758         long\s+(?:un)?signed\s+int|
 759         long\s+(?:un)?signed|
 760         (?:(?:un)?signed\s+)?long\s+int|
 761         (?:(?:un)?signed\s+)?long|
 762         int\s+long\s+(?:un)?signed|
 763         int\s+(?:(?:un)?signed\s+)?long|
 764
 765         int\s+(?:un)?signed|
 766         (?:(?:un)?signed\s+)?int
 767 )};
 768
 769 our @typeListFile = ();
 770 our @typeListWithAttr = (
 771         @typeList,
 772         qr{struct\s+$InitAttribute\s+$Ident},
 773         qr{union\s+$InitAttribute\s+$Ident},
 774 );
 775
 776 our @modifierList = (
 777         qr{fastcall},
 778 );
 779 our @modifierListFile = ();
 780
 781 our @mode_permission_funcs = (
 782         ["module_param", 3],
 783         ["module_param_(?:array|named|string)", 4],
 784         ["module_param_array_named", 5],
 785         ["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2],
 786         ["proc_create(?:_data|)", 2],
 787         ["(?:CLASS|DEVICE|SENSOR|SENSOR_DEVICE|IIO_DEVICE)_ATTR", 2],
 788         ["IIO_DEV_ATTR_[A-Z_]+", 1],
 789         ["SENSOR_(?:DEVICE_|)ATTR_2", 2],
 790         ["SENSOR_TEMPLATE(?:_2|)", 3],
 791         ["__ATTR", 2],
 792 );
 793
 794 my $word_pattern = '\b[A-Z]?[a-z]{2,}\b';
 795
 796 #Create a search pattern for all these functions to speed up a loop below
 797 our $mode_perms_search = "";
 798 foreach my $entry (@mode_permission_funcs) {
 799         $mode_perms_search .= '|' if ($mode_perms_search ne "");
 800         $mode_perms_search .= $entry->[0];
 801 }
 802 $mode_perms_search = "(?:${mode_perms_search})";
 803
 804 our %deprecated_apis = (
 805         "synchronize_rcu_bh"                    => "synchronize_rcu",
 806         "synchronize_rcu_bh_expedited"          => "synchronize_rcu_expedited",
 807         "call_rcu_bh"                           => "call_rcu",
 808         "rcu_barrier_bh"                        => "rcu_barrier",
 809         "synchronize_sched"                     => "synchronize_rcu",
 810         "synchronize_sched_expedited"           => "synchronize_rcu_expedited",
 811         "call_rcu_sched"                        => "call_rcu",
 812         "rcu_barrier_sched"                     => "rcu_barrier",
 813         "get_state_synchronize_sched"           => "get_state_synchronize_rcu",
 814         "cond_synchronize_sched"                => "cond_synchronize_rcu",
 815 );
 816
 817 #Create a search pattern for all these strings to speed up a loop below
 818 our $deprecated_apis_search = "";
 819 foreach my $entry (keys %deprecated_apis) {
 820         $deprecated_apis_search .= '|' if ($deprecated_apis_search ne "");
 821         $deprecated_apis_search .= $entry;
 822 }
 823 $deprecated_apis_search = "(?:${deprecated_apis_search})";
 824
 825 our $mode_perms_world_writable = qr{
 826         S_IWUGO         |
 827         S_IWOTH         |
 828         S_IRWXUGO       |
 829         S_IALLUGO       |
 830         0[0-7][0-7][2367]
 831 }x;
 832
 833 our %mode_permission_string_types = (
 834         "S_IRWXU" => 0700,
 835         "S_IRUSR" => 0400,
 836         "S_IWUSR" => 0200,
 837         "S_IXUSR" => 0100,
 838         "S_IRWXG" => 0070,
 839         "S_IRGRP" => 0040,
 840         "S_IWGRP" => 0020,
 841         "S_IXGRP" => 0010,
 842         "S_IRWXO" => 0007,
 843         "S_IROTH" => 0004,
 844         "S_IWOTH" => 0002,
 845         "S_IXOTH" => 0001,
 846         "S_IRWXUGO" => 0777,
 847         "S_IRUGO" => 0444,
 848         "S_IWUGO" => 0222,
 849         "S_IXUGO" => 0111,
 850 );
 851
 852 #Create a search pattern for all these strings to speed up a loop below
 853 our $mode_perms_string_search = "";
 854 foreach my $entry (keys %mode_permission_string_types) {
 855         $mode_perms_string_search .= '|' if ($mode_perms_string_search ne "");
 856         $mode_perms_string_search .= $entry;
 857 }
 858 our $single_mode_perms_string_search = "(?:${mode_perms_string_search})";
 859 our $multi_mode_perms_string_search = qr{
 860         ${single_mode_perms_string_search}
 861         (?:\s*\|\s*${single_mode_perms_string_search})*
 862 }x;
 863
 864 sub perms_to_octal {
 865         my ($string) = @_;
 866
 867         return trim($string) if ($string =~ /^\s*0[0-7]{3,3}\s*$/);
 868
 869         my $val = "";
 870         my $oval = "";
 871         my $to = 0;
 872         my $curpos = 0;
 873         my $lastpos = 0;
 874         while ($string =~ /\b(($single_mode_perms_string_search)\b(?:\s*\|\s*)?\s*)/g) {
 875                 $curpos = pos($string);
 876                 my $match = $2;
 877                 my $omatch = $1;
 878                 last if ($lastpos > 0 && ($curpos - length($omatch) != $lastpos));
 879                 $lastpos = $curpos;
 880                 $to |= $mode_permission_string_types{$match};
 881                 $val .= '\s*\|\s*' if ($val ne "");
 882                 $val .= $match;
 883                 $oval .= $omatch;
 884         }
 885         $oval =~ s/^\s*\|\s*//;
 886         $oval =~ s/\s*\|\s*$//;
 887         return sprintf("%04o", $to);
 888 }
 889
 890 our $allowed_asm_includes = qr{(?x:
 891         irq|
 892         memory|
 893         time|
 894         reboot
 895 )};
 896 # memory.h: ARM has a custom one
 897
 898 # Load common spelling mistakes and build regular expression list.
 899 my $misspellings;
 900 my %spelling_fix;
 901
 902 if (open(my $spelling, '<', $spelling_file)) {
 903         while (<$spelling>) {
 904                 my $line = $_;
 905
 906                 $line =~ s/\s*\n?$//g;
 907                 $line =~ s/^\s*//g;
 908
 909                 next if ($line =~ m/^\s*#/);
 910                 next if ($line =~ m/^\s*$/);
 911
 912                 my ($suspect, $fix) = split(/\|\|/, $line);
 913
 914                 $spelling_fix{$suspect} = $fix;
 915         }
 916         close($spelling);
 917 } else {
 918         warn "No typos will be found - file '$spelling_file': $!\n";
 919 }
 920
 921 if ($codespell) {
 922         if (open(my $spelling, '<', $codespellfile)) {
 923                 while (<$spelling>) {
 924                         my $line = $_;
 925
 926                         $line =~ s/\s*\n?$//g;
 927                         $line =~ s/^\s*//g;
 928
 929                         next if ($line =~ m/^\s*#/);
 930                         next if ($line =~ m/^\s*$/);
 931                         next if ($line =~ m/, disabled/i);
 932
 933                         $line =~ s/,.*$//;
 934
 935                         my ($suspect, $fix) = split(/->/, $line);
 936
 937                         $spelling_fix{$suspect} = $fix;
 938                 }
 939                 close($spelling);
 940         } else {
 941                 warn "No codespell typos will be found - file '$codespellfile': $!\n";
 942         }
 943 }
 944
 945 $misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;
 946
 947 sub read_words {
 948         my ($wordsRef, $file) = @_;
 949
 950         if (open(my $words, '<', $file)) {
 951                 while (<$words>) {
 952                         my $line = $_;
 953
 954                         $line =~ s/\s*\n?$//g;
 955                         $line =~ s/^\s*//g;
 956
 957                         next if ($line =~ m/^\s*#/);
 958                         next if ($line =~ m/^\s*$/);
 959                         if ($line =~ /\s/) {
 960                                 print("$file: '$line' invalid - ignored\n");
 961                                 next;
 962                         }
 963
 964                         $$wordsRef .= '|' if (defined $$wordsRef);
 965                         $$wordsRef .= $line;
 966                 }
 967                 close($file);
 968                 return 1;
 969         }
 970
 971         return 0;
 972 }
 973
 974 my $const_structs;
 975 if (show_type("CONST_STRUCT")) {
 976         read_words(\$const_structs, $conststructsfile)
 977             or warn "No structs that should be const will be found - file '$conststructsfile': $!\n";
 978 }
 979
 980 if (defined($typedefsfile)) {
 981         my $typeOtherTypedefs;
 982         read_words(\$typeOtherTypedefs, $typedefsfile)
 983             or warn "No additional types will be considered - file '$typedefsfile': $!\n";
 984         $typeTypedefs .= '|' . $typeOtherTypedefs if (defined $typeOtherTypedefs);
 985 }
 986
 987 sub build_types {
 988         my $mods = "(?x:  \n" . join("|\n  ", (@modifierList, @modifierListFile)) . "\n)";
 989         my $all = "(?x:  \n" . join("|\n  ", (@typeList, @typeListFile)) . "\n)";
 990         my $Misordered = "(?x:  \n" . join("|\n  ", @typeListMisordered) . "\n)";
 991         my $allWithAttr = "(?x:  \n" . join("|\n  ", @typeListWithAttr) . "\n)";
 992         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 993         $BasicType      = qr{
 994                                 (?:$typeTypedefs\b)|
 995                                 (?:${all}\b)
 996                 }x;
 997         $NonptrType     = qr{
 998                         (?:$Modifier\s+|const\s+)*
 999                         (?:
1000                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
1001                                 (?:$typeTypedefs\b)|
1002                                 (?:${all}\b)
1003                         )
1004                         (?:\s+$Modifier|\s+const)*
1005                   }x;
1006         $NonptrTypeMisordered   = qr{
1007                         (?:$Modifier\s+|const\s+)*
1008                         (?:
1009                                 (?:${Misordered}\b)
1010                         )
1011                         (?:\s+$Modifier|\s+const)*
1012                   }x;
1013         $NonptrTypeWithAttr     = qr{
1014                         (?:$Modifier\s+|const\s+)*
1015                         (?:
1016                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
1017                                 (?:$typeTypedefs\b)|
1018                                 (?:${allWithAttr}\b)
1019                         )
1020                         (?:\s+$Modifier|\s+const)*
1021                   }x;
1022         $Type   = qr{
1023                         $NonptrType
1024                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+){0,4}
1025                         (?:\s+$Inline|\s+$Modifier)*
1026                   }x;
1027         $TypeMisordered = qr{
1028                         $NonptrTypeMisordered
1029                         (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+){0,4}
1030                         (?:\s+$Inline|\s+$Modifier)*
1031                   }x;
1032         $Declare        = qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
1033         $DeclareMisordered      = qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered};
1034 }
1035 build_types();
1036
1037 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
1038
1039 # Using $balanced_parens, $LvalOrFunc, or $FuncArg
1040 # requires at least perl version v5.10.0
1041 # Any use must be runtime checked with $^V
1042
1043 our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
1044 our $LvalOrFunc = qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
1045 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)};
1046
1047 our $declaration_macros = qr{(?x:
1048         (?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,6}\s*\(|
1049         (?:$Storage\s+)?[HLP]?LIST_HEAD\s*\(|
1050         (?:SKCIPHER_REQUEST|SHASH_DESC|AHASH_REQUEST)_ON_STACK\s*\(
1051 )};
1052
1053 our %allow_repeated_words = (
1054         add => '',
1055         added => '',
1056         bad => '',
1057         be => '',
1058 );
1059
1060 sub deparenthesize {
1061         my ($string) = @_;
1062         return "" if (!defined($string));
1063
1064         while ($string =~ /^\s*\(.*\)\s*$/) {
1065                 $string =~ s@^\s*\(\s*@@;
1066                 $string =~ s@\s*\)\s*$@@;
1067         }
1068
1069         $string =~ s@\s+@ @g;
1070
1071         return $string;
1072 }
1073
1074 sub seed_camelcase_file {
1075         my ($file) = @_;
1076
1077         return if (!(-f $file));
1078
1079         local $/;
1080
1081         open(my $include_file, '<', "$file")
1082             or warn "$P: Can't read '$file' $!\n";
1083         my $text = <$include_file>;
1084         close($include_file);
1085
1086         my @lines = split('\n', $text);
1087
1088         foreach my $line (@lines) {
1089                 next if ($line !~ /(?:[A-Z][a-z]|[a-z][A-Z])/);
1090                 if ($line =~ /^[ \t]*(?:#[ \t]*define|typedef\s+$Type)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)/) {
1091                         $camelcase{$1} = 1;
1092                 } elsif ($line =~ /^\s*$Declare\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[\(\[,;]/) {
1093                         $camelcase{$1} = 1;
1094                 } elsif ($line =~ /^\s*(?:union|struct|enum)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[;\{]/) {
1095                         $camelcase{$1} = 1;
1096                 }
1097         }
1098 }
1099
1100 our %maintained_status = ();
1101
1102 sub is_maintained_obsolete {
1103         my ($filename) = @_;
1104
1105         return 0 if (!$tree || !(-e "$root/scripts/get_maintainer.pl"));
1106
1107         if (!exists($maintained_status{$filename})) {
1108                 $maintained_status{$filename} = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback -f $filename 2>&1`;
1109         }
1110
1111         return $maintained_status{$filename} =~ /obsolete/i;
1112 }
1113
1114 sub is_SPDX_License_valid {
1115         my ($license) = @_;
1116
1117         return 1 if (!$tree || which("python3") eq "" || !(-x "$root/scripts/spdxcheck.py") || !(-e "$gitroot"));
1118
1119         my $root_path = abs_path($root);
1120         my $status = `cd "$root_path"; echo "$license" | scripts/spdxcheck.py -`;
1121         return 0 if ($status ne "");
1122         return 1;
1123 }
1124
1125 my $camelcase_seeded = 0;
1126 sub seed_camelcase_includes {
1127         return if ($camelcase_seeded);
1128
1129         my $files;
1130         my $camelcase_cache = "";
1131         my @include_files = ();
1132
1133         $camelcase_seeded = 1;
1134
1135         if (-e "$gitroot") {
1136                 my $git_last_include_commit = `${git_command} log --no-merges --pretty=format:"%h%n" -1 -- include`;
1137                 chomp $git_last_include_commit;
1138                 $camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
1139         } else {
1140                 my $last_mod_date = 0;
1141                 $files = `find $root/include -name "*.h"`;
1142                 @include_files = split('\n', $files);
1143                 foreach my $file (@include_files) {
1144                         my $date = POSIX::strftime("%Y%m%d%H%M",
1145                                                    localtime((stat $file)[9]));
1146                         $last_mod_date = $date if ($last_mod_date < $date);
1147                 }
1148                 $camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
1149         }
1150
1151         if ($camelcase_cache ne "" && -f $camelcase_cache) {
1152                 open(my $camelcase_file, '<', "$camelcase_cache")
1153                     or warn "$P: Can't read '$camelcase_cache' $!\n";
1154                 while (<$camelcase_file>) {
1155                         chomp;
1156                         $camelcase{$_} = 1;
1157                 }
1158                 close($camelcase_file);
1159
1160                 return;
1161         }
1162
1163         if (-e "$gitroot") {
1164                 $files = `${git_command} ls-files "include/*.h"`;
1165                 @include_files = split('\n', $files);
1166         }
1167
1168         foreach my $file (@include_files) {
1169                 seed_camelcase_file($file);
1170         }
1171
1172         if ($camelcase_cache ne "") {
1173                 unlink glob ".checkpatch-camelcase.*";
1174                 open(my $camelcase_file, '>', "$camelcase_cache")
1175                     or warn "$P: Can't write '$camelcase_cache' $!\n";
1176                 foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
1177                         print $camelcase_file ("$_\n");
1178                 }
1179                 close($camelcase_file);
1180         }
1181 }
1182
1183 sub git_is_single_file {
1184         my ($filename) = @_;
1185
1186         return 0 if ((which("git") eq "") || !(-e "$gitroot"));
1187
1188         my $output = `${git_command} ls-files -- $filename 2>/dev/null`;
1189         my $count = $output =~ tr/\n//;
1190         return $count eq 1 && $output =~ m{^${filename}$};
1191 }
1192
1193 sub git_commit_info {
1194         my ($commit, $id, $desc) = @_;
1195
1196         return ($id, $desc) if ((which("git") eq "") || !(-e "$gitroot"));
1197
1198         my $output = `${git_command} log --no-color --format='%H %s' -1 $commit 2>&1`;
1199         $output =~ s/^\s*//gm;
1200         my @lines = split("\n", $output);
1201
1202         return ($id, $desc) if ($#lines < 0);
1203
1204         if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous/) {
1205 # Maybe one day convert this block of bash into something that returns
1206 # all matching commit ids, but it's very slow...
1207 #
1208 #               echo "checking commits $1..."
1209 #               git rev-list --remotes | grep -i "^$1" |
1210 #               while read line ; do
1211 #                   git log --format='%H %s' -1 $line |
1212 #                   echo "commit $(cut -c 1-12,41-)"
1213 #               done
1214         } elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./ ||
1215                  $lines[0] =~ /^fatal: bad object $commit/) {
1216                 $id = undef;
1217         } else {
1218                 $id = substr($lines[0], 0, 12);
1219                 $desc = substr($lines[0], 41);
1220         }
1221
1222         return ($id, $desc);
1223 }
1224
1225 $chk_signoff = 0 if ($file);
1226
1227 my @rawlines = ();
1228 my @lines = ();
1229 my @fixed = ();
1230 my @fixed_inserted = ();
1231 my @fixed_deleted = ();
1232 my $fixlinenr = -1;
1233
1234 # If input is git commits, extract all commits from the commit expressions.
1235 # For example, HEAD-3 means we need check 'HEAD, HEAD~1, HEAD~2'.
1236 die "$P: No git repository found\n" if ($git && !-e "$gitroot");
1237
1238 if ($git) {
1239         my @commits = ();
1240         foreach my $commit_expr (@ARGV) {
1241                 my $git_range;
1242                 if ($commit_expr =~ m/^(.*)-(\d+)$/) {
1243                         $git_range = "-$2 $1";
1244                 } elsif ($commit_expr =~ m/\.\./) {
1245                         $git_range = "$commit_expr";
1246                 } else {
1247                         $git_range = "-1 $commit_expr";
1248                 }
1249                 my $lines = `${git_command} log --no-color --no-merges --pretty=format:'%H %s' $git_range`;
1250                 foreach my $line (split(/\n/, $lines)) {
1251                         $line =~ /^([0-9a-fA-F]{40,40}) (.*)$/;
1252                         next if (!defined($1) || !defined($2));
1253                         my $sha1 = $1;
1254                         my $subject = $2;
1255                         unshift(@commits, $sha1);
1256                         $git_commits{$sha1} = $subject;
1257                 }
1258         }
1259         die "$P: no git commits after extraction!\n" if (@commits == 0);
1260         @ARGV = @commits;
1261 }
1262
1263 my $vname;
1264 $allow_c99_comments = !defined $ignore_type{"C99_COMMENT_TOLERANCE"};
1265 for my $filename (@ARGV) {
1266         my $FILE;
1267         my $is_git_file = git_is_single_file($filename);
1268         my $oldfile = $file;
1269         $file = 1 if ($is_git_file);
1270         if ($git) {
1271                 open($FILE, '-|', "git format-patch -M --stdout -1 $filename") ||
1272                         die "$P: $filename: git format-patch failed - $!\n";
1273         } elsif ($file) {
1274                 open($FILE, '-|', "diff -u /dev/null $filename") ||
1275                         die "$P: $filename: diff failed - $!\n";
1276         } elsif ($filename eq '-') {
1277                 open($FILE, '<&STDIN');
1278         } else {
1279                 open($FILE, '<', "$filename") ||
1280                         die "$P: $filename: open failed - $!\n";
1281         }
1282         if ($filename eq '-') {
1283                 $vname = 'Your patch';
1284         } elsif ($git) {
1285                 $vname = "Commit " . substr($filename, 0, 12) . ' ("' . $git_commits{$filename} . '")';
1286         } else {
1287                 $vname = $filename;
1288         }
1289         while (<$FILE>) {
1290                 chomp;
1291                 push(@rawlines, $_);
1292                 $vname = qq("$1") if ($filename eq '-' && $_ =~ m/^Subject:\s+(.+)/i);
1293         }
1294         close($FILE);
1295
1296         if ($#ARGV > 0 && $quiet == 0) {
1297                 print '-' x length($vname) . "\n";
1298                 print "$vname\n";
1299                 print '-' x length($vname) . "\n";
1300         }
1301
1302         if (!process($filename)) {
1303                 $exit = 1;
1304         }
1305         @rawlines = ();
1306         @lines = ();
1307         @fixed = ();
1308         @fixed_inserted = ();
1309         @fixed_deleted = ();
1310         $fixlinenr = -1;
1311         @modifierListFile = ();
1312         @typeListFile = ();
1313         build_types();
1314         $file = $oldfile if ($is_git_file);
1315 }
1316
1317 if (!$quiet) {
1318         hash_show_words(\%use_type, "Used");
1319         hash_show_words(\%ignore_type, "Ignored");
1320
1321         if (!$perl_version_ok) {
1322                 print << "EOM"
1323
1324 NOTE: perl $^V is not modern enough to detect all possible issues.
1325       An upgrade to at least perl $minimum_perl_version is suggested.
1326 EOM
1327         }
1328         if ($exit) {
1329                 print << "EOM"
1330
1331 NOTE: If any of the errors are false positives, please report
1332       them to the maintainer, see CHECKPATCH in MAINTAINERS.
1333 EOM
1334         }
1335 }
1336
1337 exit($exit);
1338
1339 sub top_of_kernel_tree {
1340         my ($root) = @_;
1341
1342         my @tree_check = (
1343                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
1344                 "README", "Documentation", "arch", "include", "drivers",
1345                 "fs", "init", "ipc", "kernel", "lib", "scripts",
1346         );
1347
1348         foreach my $check (@tree_check) {
1349                 if (! -e $root . '/' . $check) {
1350                         return 0;
1351                 }
1352         }
1353         return 1;
1354 }
1355
1356 sub parse_email {
1357         my ($formatted_email) = @_;
1358
1359         my $name = "";
1360         my $quoted = "";
1361         my $name_comment = "";
1362         my $address = "";
1363         my $comment = "";
1364
1365         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
1366                 $name = $1;
1367                 $address = $2;
1368                 $comment = $3 if defined $3;
1369         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
1370                 $address = $1;
1371                 $comment = $2 if defined $2;
1372         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
1373                 $address = $1;
1374                 $comment = $2 if defined $2;
1375                 $formatted_email =~ s/\Q$address\E.*$//;
1376                 $name = $formatted_email;
1377                 $name = trim($name);
1378                 $name =~ s/^\"|\"$//g;
1379                 # If there's a name left after stripping spaces and
1380                 # leading quotes, and the address doesn't have both
1381                 # leading and trailing angle brackets, the address
1382                 # is invalid. ie:
1383                 #   "joe smith joe@smith.com" bad
1384                 #   "joe smith <joe@smith.com" bad
1385                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
1386                         $name = "";
1387                         $address = "";
1388                         $comment = "";
1389                 }
1390         }
1391
1392         # Extract comments from names excluding quoted parts
1393         # "John D. (Doe)" - Do not extract
1394         if ($name =~ s/\"(.+)\"//) {
1395                 $quoted = $1;
1396         }
1397         while ($name =~ s/\s*($balanced_parens)\s*/ /) {
1398                 $name_comment .= trim($1);
1399         }
1400         $name =~ s/^[ \"]+|[ \"]+$//g;
1401         $name = trim("$quoted $name");
1402
1403         $address = trim($address);
1404         $address =~ s/^\<|\>$//g;
1405         $comment = trim($comment);
1406
1407         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
1408                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
1409                 $name = "\"$name\"";
1410         }
1411
1412         return ($name, $name_comment, $address, $comment);
1413 }
1414
1415 sub format_email {
1416         my ($name, $name_comment, $address, $comment) = @_;
1417
1418         my $formatted_email;
1419
1420         $name =~ s/^[ \"]+|[ \"]+$//g;
1421         $address = trim($address);
1422         $address =~ s/(?:\.|\,|\")+$//; ##trailing commas, dots or quotes
1423
1424         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
1425                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
1426                 $name = "\"$name\"";
1427         }
1428
1429         $name_comment = trim($name_comment);
1430         $name_comment = " $name_comment" if ($name_comment ne "");
1431         $comment = trim($comment);
1432         $comment = " $comment" if ($comment ne "");
1433
1434         if ("$name" eq "") {
1435                 $formatted_email = "$address";
1436         } else {
1437                 $formatted_email = "$name$name_comment <$address>";
1438         }
1439         $formatted_email .= "$comment";
1440         return $formatted_email;
1441 }
1442
1443 sub reformat_email {
1444         my ($email) = @_;
1445
1446         my ($email_name, $name_comment, $email_address, $comment) = parse_email($email);
1447         return format_email($email_name, $name_comment, $email_address, $comment);
1448 }
1449
1450 sub same_email_addresses {
1451         my ($email1, $email2) = @_;
1452
1453         my ($email1_name, $name1_comment, $email1_address, $comment1) = parse_email($email1);
1454         my ($email2_name, $name2_comment, $email2_address, $comment2) = parse_email($email2);
1455
1456         return $email1_name eq $email2_name &&
1457                $email1_address eq $email2_address &&
1458                $name1_comment eq $name2_comment &&
1459                $comment1 eq $comment2;
1460 }
1461
1462 sub which {
1463         my ($bin) = @_;
1464
1465         foreach my $path (split(/:/, $ENV{PATH})) {
1466                 if (-e "$path/$bin") {
1467                         return "$path/$bin";
1468                 }
1469         }
1470
1471         return "";
1472 }
1473
1474 sub which_conf {
1475         my ($conf) = @_;
1476
1477         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
1478                 if (-e "$path/$conf") {
1479                         return "$path/$conf";
1480                 }
1481         }
1482
1483         return "";
1484 }
1485
1486 sub expand_tabs {
1487         my ($str) = @_;
1488
1489         my $res = '';
1490         my $n = 0;
1491         for my $c (split(//, $str)) {
1492                 if ($c eq "\t") {
1493                         $res .= ' ';
1494                         $n++;
1495                         for (; ($n % $tabsize) != 0; $n++) {
1496                                 $res .= ' ';
1497                         }
1498                         next;
1499                 }
1500                 $res .= $c;
1501                 $n++;
1502         }
1503
1504         return $res;
1505 }
1506 sub copy_spacing {
1507         (my $res = shift) =~ tr/\t/ /c;
1508         return $res;
1509 }
1510
1511 sub line_stats {
1512         my ($line) = @_;
1513
1514         # Drop the diff line leader and expand tabs
1515         $line =~ s/^.//;
1516         $line = expand_tabs($line);
1517
1518         # Pick the indent from the front of the line.
1519         my ($white) = ($line =~ /^(\s*)/);
1520
1521         return (length($line), length($white));
1522 }
1523
1524 my $sanitise_quote = '';
1525
1526 sub sanitise_line_reset {
1527         my ($in_comment) = @_;
1528
1529         if ($in_comment) {
1530                 $sanitise_quote = '*/';
1531         } else {
1532                 $sanitise_quote = '';
1533         }
1534 }
1535 sub sanitise_line {
1536         my ($line) = @_;
1537
1538         my $res = '';
1539         my $l = '';
1540
1541         my $qlen = 0;
1542         my $off = 0;
1543         my $c;
1544
1545         # Always copy over the diff marker.
1546         $res = substr($line, 0, 1);
1547
1548         for ($off = 1; $off < length($line); $off++) {
1549                 $c = substr($line, $off, 1);
1550
1551                 # Comments we are whacking completely including the begin
1552                 # and end, all to $;.
1553                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
1554                         $sanitise_quote = '*/';
1555
1556                         substr($res, $off, 2, "$;$;");
1557                         $off++;
1558                         next;
1559                 }
1560                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
1561                         $sanitise_quote = '';
1562                         substr($res, $off, 2, "$;$;");
1563                         $off++;
1564                         next;
1565                 }
1566                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
1567                         $sanitise_quote = '//';
1568
1569                         substr($res, $off, 2, $sanitise_quote);
1570                         $off++;
1571                         next;
1572                 }
1573
1574                 # A \ in a string means ignore the next character.
1575                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
1576                     $c eq "\\") {
1577                         substr($res, $off, 2, 'XX');
1578                         $off++;
1579                         next;
1580                 }
1581                 # Regular quotes.
1582                 if ($c eq "'" || $c eq '"') {
1583                         if ($sanitise_quote eq '') {
1584                                 $sanitise_quote = $c;
1585
1586                                 substr($res, $off, 1, $c);
1587                                 next;
1588                         } elsif ($sanitise_quote eq $c) {
1589                                 $sanitise_quote = '';
1590                         }
1591                 }
1592
1593                 #print "c<$c> SQ<$sanitise_quote>\n";
1594                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
1595                         substr($res, $off, 1, $;);
1596                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
1597                         substr($res, $off, 1, $;);
1598                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
1599                         substr($res, $off, 1, 'X');
1600                 } else {
1601                         substr($res, $off, 1, $c);
1602                 }
1603         }
1604
1605         if ($sanitise_quote eq '//') {
1606                 $sanitise_quote = '';
1607         }
1608
1609         # The pathname on a #include may be surrounded by '<' and '>'.
1610         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
1611                 my $clean = 'X' x length($1);
1612                 $res =~ s@\<.*\>@<$clean>@;
1613
1614         # The whole of a #error is a string.
1615         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
1616                 my $clean = 'X' x length($1);
1617                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
1618         }
1619
1620         if ($allow_c99_comments && $res =~ m@(//.*$)@) {
1621                 my $match = $1;
1622                 $res =~ s/\Q$match\E/"$;" x length($match)/e;
1623         }
1624
1625         return $res;
1626 }
1627
1628 sub get_quoted_string {
1629         my ($line, $rawline) = @_;
1630
1631         return "" if (!defined($line) || !defined($rawline));
1632         return "" if ($line !~ m/($String)/g);
1633         return substr($rawline, $-[0], $+[0] - $-[0]);
1634 }
1635
1636 sub ctx_statement_block {
1637         my ($linenr, $remain, $off) = @_;
1638         my $line = $linenr - 1;
1639         my $blk = '';
1640         my $soff = $off;
1641         my $coff = $off - 1;
1642         my $coff_set = 0;
1643
1644         my $loff = 0;
1645
1646         my $type = '';
1647         my $level = 0;
1648         my @stack = ();
1649         my $p;
1650         my $c;
1651         my $len = 0;
1652
1653         my $remainder;
1654         while (1) {
1655                 @stack = (['', 0]) if ($#stack == -1);
1656
1657                 #warn "CSB: blk<$blk> remain<$remain>\n";
1658                 # If we are about to drop off the end, pull in more
1659                 # context.
1660                 if ($off >= $len) {
1661                         for (; $remain > 0; $line++) {
1662                                 last if (!defined $lines[$line]);
1663                                 next if ($lines[$line] =~ /^-/);
1664                                 $remain--;
1665                                 $loff = $len;
1666                                 $blk .= $lines[$line] . "\n";
1667                                 $len = length($blk);
1668                                 $line++;
1669                                 last;
1670                         }
1671                         # Bail if there is no further context.
1672                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
1673                         if ($off >= $len) {
1674                                 last;
1675                         }
1676                         if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
1677                                 $level++;
1678                                 $type = '#';
1679                         }
1680                 }
1681                 $p = $c;
1682                 $c = substr($blk, $off, 1);
1683                 $remainder = substr($blk, $off);
1684
1685                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
1686
1687                 # Handle nested #if/#else.
1688                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
1689                         push(@stack, [ $type, $level ]);
1690                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
1691                         ($type, $level) = @{$stack[$#stack - 1]};
1692                 } elsif ($remainder =~ /^#\s*endif\b/) {
1693                         ($type, $level) = @{pop(@stack)};
1694                 }
1695
1696                 # Statement ends at the ';' or a close '}' at the
1697                 # outermost level.
1698                 if ($level == 0 && $c eq ';') {
1699                         last;
1700                 }
1701
1702                 # An else is really a conditional as long as its not else if
1703                 if ($level == 0 && $coff_set == 0 &&
1704                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
1705                                 $remainder =~ /^(else)(?:\s|{)/ &&
1706                                 $remainder !~ /^else\s+if\b/) {
1707                         $coff = $off + length($1) - 1;
1708                         $coff_set = 1;
1709                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
1710                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
1711                 }
1712
1713                 if (($type eq '' || $type eq '(') && $c eq '(') {
1714                         $level++;
1715                         $type = '(';
1716                 }
1717                 if ($type eq '(' && $c eq ')') {
1718                         $level--;
1719                         $type = ($level != 0)? '(' : '';
1720
1721                         if ($level == 0 && $coff < $soff) {
1722                                 $coff = $off;
1723                                 $coff_set = 1;
1724                                 #warn "CSB: mark coff<$coff>\n";
1725                         }
1726                 }
1727                 if (($type eq '' || $type eq '{') && $c eq '{') {
1728                         $level++;
1729                         $type = '{';
1730                 }
1731                 if ($type eq '{' && $c eq '}') {
1732                         $level--;
1733                         $type = ($level != 0)? '{' : '';
1734
1735                         if ($level == 0) {
1736                                 if (substr($blk, $off + 1, 1) eq ';') {
1737                                         $off++;
1738                                 }
1739                                 last;
1740                         }
1741                 }
1742                 # Preprocessor commands end at the newline unless escaped.
1743                 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
1744                         $level--;
1745                         $type = '';
1746                         $off++;
1747                         last;
1748                 }
1749                 $off++;
1750         }
1751         # We are truly at the end, so shuffle to the next line.
1752         if ($off == $len) {
1753                 $loff = $len + 1;
1754                 $line++;
1755                 $remain--;
1756         }
1757
1758         my $statement = substr($blk, $soff, $off - $soff + 1);
1759         my $condition = substr($blk, $soff, $coff - $soff + 1);
1760
1761         #warn "STATEMENT<$statement>\n";
1762         #warn "CONDITION<$condition>\n";
1763
1764         #print "coff<$coff> soff<$off> loff<$loff>\n";
1765
1766         return ($statement, $condition,
1767                         $line, $remain + 1, $off - $loff + 1, $level);
1768 }
1769
1770 sub statement_lines {
1771         my ($stmt) = @_;
1772
1773         # Strip the diff line prefixes and rip blank lines at start and end.
1774         $stmt =~ s/(^|\n)./$1/g;
1775         $stmt =~ s/^\s*//;
1776         $stmt =~ s/\s*$//;
1777
1778         my @stmt_lines = ($stmt =~ /\n/g);
1779
1780         return $#stmt_lines + 2;
1781 }
1782
1783 sub statement_rawlines {
1784         my ($stmt) = @_;
1785
1786         my @stmt_lines = ($stmt =~ /\n/g);
1787
1788         return $#stmt_lines + 2;
1789 }
1790
1791 sub statement_block_size {
1792         my ($stmt) = @_;
1793
1794         $stmt =~ s/(^|\n)./$1/g;
1795         $stmt =~ s/^\s*{//;
1796         $stmt =~ s/}\s*$//;
1797         $stmt =~ s/^\s*//;
1798         $stmt =~ s/\s*$//;
1799
1800         my @stmt_lines = ($stmt =~ /\n/g);
1801         my @stmt_statements = ($stmt =~ /;/g);
1802
1803         my $stmt_lines = $#stmt_lines + 2;
1804         my $stmt_statements = $#stmt_statements + 1;
1805
1806         if ($stmt_lines > $stmt_statements) {
1807                 return $stmt_lines;
1808         } else {
1809                 return $stmt_statements;
1810         }
1811 }
1812
1813 sub ctx_statement_full {
1814         my ($linenr, $remain, $off) = @_;
1815         my ($statement, $condition, $level);
1816
1817         my (@chunks);
1818
1819         # Grab the first conditional/block pair.
1820         ($statement, $condition, $linenr, $remain, $off, $level) =
1821                                 ctx_statement_block($linenr, $remain, $off);
1822         #print "F: c<$condition> s<$statement> remain<$remain>\n";
1823         push(@chunks, [ $condition, $statement ]);
1824         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
1825                 return ($level, $linenr, @chunks);
1826         }
1827
1828         # Pull in the following conditional/block pairs and see if they
1829         # could continue the statement.
1830         for (;;) {
1831                 ($statement, $condition, $linenr, $remain, $off, $level) =
1832                                 ctx_statement_block($linenr, $remain, $off);
1833                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
1834                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
1835                 #print "C: push\n";
1836                 push(@chunks, [ $condition, $statement ]);
1837         }
1838
1839         return ($level, $linenr, @chunks);
1840 }
1841
1842 sub ctx_block_get {
1843         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
1844         my $line;
1845         my $start = $linenr - 1;
1846         my $blk = '';
1847         my @o;
1848         my @c;
1849         my @res = ();
1850
1851         my $level = 0;
1852         my @stack = ($level);
1853         for ($line = $start; $remain > 0; $line++) {
1854                 next if ($rawlines[$line] =~ /^-/);
1855                 $remain--;
1856
1857                 $blk .= $rawlines[$line];
1858
1859                 # Handle nested #if/#else.
1860                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
1861                         push(@stack, $level);
1862                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
1863                         $level = $stack[$#stack - 1];
1864                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
1865                         $level = pop(@stack);
1866                 }
1867
1868                 foreach my $c (split(//, $lines[$line])) {
1869                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
1870                         if ($off > 0) {
1871                                 $off--;
1872                                 next;
1873                         }
1874
1875                         if ($c eq $close && $level > 0) {
1876                                 $level--;
1877                                 last if ($level == 0);
1878                         } elsif ($c eq $open) {
1879                                 $level++;
1880                         }
1881                 }
1882
1883                 if (!$outer || $level <= 1) {
1884                         push(@res, $rawlines[$line]);
1885                 }
1886
1887                 last if ($level == 0);
1888         }
1889
1890         return ($level, @res);
1891 }
1892 sub ctx_block_outer {
1893         my ($linenr, $remain) = @_;
1894
1895         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
1896         return @r;
1897 }
1898 sub ctx_block {
1899         my ($linenr, $remain) = @_;
1900
1901         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1902         return @r;
1903 }
1904 sub ctx_statement {
1905         my ($linenr, $remain, $off) = @_;
1906
1907         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1908         return @r;
1909 }
1910 sub ctx_block_level {
1911         my ($linenr, $remain) = @_;
1912
1913         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
1914 }
1915 sub ctx_statement_level {
1916         my ($linenr, $remain, $off) = @_;
1917
1918         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
1919 }
1920
1921 sub ctx_locate_comment {
1922         my ($first_line, $end_line) = @_;
1923
1924         # If c99 comment on the current line, or the line before or after
1925         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@^\+.*(//.*$)@);
1926         return $current_comment if (defined $current_comment);
1927         ($current_comment) = ($rawlines[$end_line - 2] =~ m@^[\+ ].*(//.*$)@);
1928         return $current_comment if (defined $current_comment);
1929         ($current_comment) = ($rawlines[$end_line] =~ m@^[\+ ].*(//.*$)@);
1930         return $current_comment if (defined $current_comment);
1931
1932         # Catch a comment on the end of the line itself.
1933         ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
1934         return $current_comment if (defined $current_comment);
1935
1936         # Look through the context and try and figure out if there is a
1937         # comment.
1938         my $in_comment = 0;
1939         $current_comment = '';
1940         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
1941                 my $line = $rawlines[$linenr - 1];
1942                 #warn "           $line\n";
1943                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
1944                         $in_comment = 1;
1945                 }
1946                 if ($line =~ m@/\*@) {
1947                         $in_comment = 1;
1948                 }
1949                 if (!$in_comment && $current_comment ne '') {
1950                         $current_comment = '';
1951                 }
1952                 $current_comment .= $line . "\n" if ($in_comment);
1953                 if ($line =~ m@\*/@) {
1954                         $in_comment = 0;
1955                 }
1956         }
1957
1958         chomp($current_comment);
1959         return($current_comment);
1960 }
1961 sub ctx_has_comment {
1962         my ($first_line, $end_line) = @_;
1963         my $cmt = ctx_locate_comment($first_line, $end_line);
1964
1965         ##print "LINE: $rawlines[$end_line - 1 ]\n";
1966         ##print "CMMT: $cmt\n";
1967
1968         return ($cmt ne '');
1969 }
1970
1971 sub raw_line {
1972         my ($linenr, $cnt) = @_;
1973
1974         my $offset = $linenr - 1;
1975         $cnt++;
1976
1977         my $line;
1978         while ($cnt) {
1979                 $line = $rawlines[$offset++];
1980                 next if (defined($line) && $line =~ /^-/);
1981                 $cnt--;
1982         }
1983
1984         return $line;
1985 }
1986
1987 sub get_stat_real {
1988         my ($linenr, $lc) = @_;
1989
1990         my $stat_real = raw_line($linenr, 0);
1991         for (my $count = $linenr + 1; $count <= $lc; $count++) {
1992                 $stat_real = $stat_real . "\n" . raw_line($count, 0);
1993         }
1994
1995         return $stat_real;
1996 }
1997
1998 sub get_stat_here {
1999         my ($linenr, $cnt, $here) = @_;
2000
2001         my $herectx = $here . "\n";
2002         for (my $n = 0; $n < $cnt; $n++) {
2003                 $herectx .= raw_line($linenr, $n) . "\n";
2004         }
2005
2006         return $herectx;
2007 }
2008
2009 sub cat_vet {
2010         my ($vet) = @_;
2011         my ($res, $coded);
2012
2013         $res = '';
2014         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
2015                 $res .= $1;
2016                 if ($2 ne '') {
2017                         $coded = sprintf("^%c", unpack('C', $2) + 64);
2018                         $res .= $coded;
2019                 }
2020         }
2021         $res =~ s/$/\$/;
2022
2023         return $res;
2024 }
2025
2026 my $av_preprocessor = 0;
2027 my $av_pending;
2028 my @av_paren_type;
2029 my $av_pend_colon;
2030
2031 sub annotate_reset {
2032         $av_preprocessor = 0;
2033         $av_pending = '_';
2034         @av_paren_type = ('E');
2035         $av_pend_colon = 'O';
2036 }
2037
2038 sub annotate_values {
2039         my ($stream, $type) = @_;
2040
2041         my $res;
2042         my $var = '_' x length($stream);
2043         my $cur = $stream;
2044
2045         print "$stream\n" if ($dbg_values > 1);
2046
2047         while (length($cur)) {
2048                 @av_paren_type = ('E') if ($#av_paren_type < 0);
2049                 print " <" . join('', @av_paren_type) .
2050                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
2051                 if ($cur =~ /^(\s+)/o) {
2052                         print "WS($1)\n" if ($dbg_values > 1);
2053                         if ($1 =~ /\n/ && $av_preprocessor) {
2054                                 $type = pop(@av_paren_type);
2055                                 $av_preprocessor = 0;
2056                         }
2057
2058                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
2059                         print "CAST($1)\n" if ($dbg_values > 1);
2060                         push(@av_paren_type, $type);
2061                         $type = 'c';
2062
2063                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
2064                         print "DECLARE($1)\n" if ($dbg_values > 1);
2065                         $type = 'T';
2066
2067                 } elsif ($cur =~ /^($Modifier)\s*/) {
2068                         print "MODIFIER($1)\n" if ($dbg_values > 1);
2069                         $type = 'T';
2070
2071                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
2072                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
2073                         $av_preprocessor = 1;
2074                         push(@av_paren_type, $type);
2075                         if ($2 ne '') {
2076                                 $av_pending = 'N';
2077                         }
2078                         $type = 'E';
2079
2080                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
2081                         print "UNDEF($1)\n" if ($dbg_values > 1);
2082                         $av_preprocessor = 1;
2083                         push(@av_paren_type, $type);
2084
2085                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
2086                         print "PRE_START($1)\n" if ($dbg_values > 1);
2087                         $av_preprocessor = 1;
2088
2089                         push(@av_paren_type, $type);
2090                         push(@av_paren_type, $type);
2091                         $type = 'E';
2092
2093                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
2094                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
2095                         $av_preprocessor = 1;
2096
2097                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
2098
2099                         $type = 'E';
2100
2101                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
2102                         print "PRE_END($1)\n" if ($dbg_values > 1);
2103
2104                         $av_preprocessor = 1;
2105
2106                         # Assume all arms of the conditional end as this
2107                         # one does, and continue as if the #endif was not here.
2108                         pop(@av_paren_type);
2109                         push(@av_paren_type, $type);
2110                         $type = 'E';
2111
2112                 } elsif ($cur =~ /^(\\\n)/o) {
2113                         print "PRECONT($1)\n" if ($dbg_values > 1);
2114
2115                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
2116                         print "ATTR($1)\n" if ($dbg_values > 1);
2117                         $av_pending = $type;
2118                         $type = 'N';
2119
2120                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
2121                         print "SIZEOF($1)\n" if ($dbg_values > 1);
2122                         if (defined $2) {
2123                                 $av_pending = 'V';
2124                         }
2125                         $type = 'N';
2126
2127                 } elsif ($cur =~ /^(if|while|for)\b/o) {
2128                         print "COND($1)\n" if ($dbg_values > 1);
2129                         $av_pending = 'E';
2130                         $type = 'N';
2131
2132                 } elsif ($cur =~/^(case)/o) {
2133                         print "CASE($1)\n" if ($dbg_values > 1);
2134                         $av_pend_colon = 'C';
2135                         $type = 'N';
2136
2137                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
2138                         print "KEYWORD($1)\n" if ($dbg_values > 1);
2139                         $type = 'N';
2140
2141                 } elsif ($cur =~ /^(\()/o) {
2142                         print "PAREN('$1')\n" if ($dbg_values > 1);
2143                         push(@av_paren_type, $av_pending);
2144                         $av_pending = '_';
2145                         $type = 'N';
2146
2147                 } elsif ($cur =~ /^(\))/o) {
2148                         my $new_type = pop(@av_paren_type);
2149                         if ($new_type ne '_') {
2150                                 $type = $new_type;
2151                                 print "PAREN('$1') -> $type\n"
2152                                                         if ($dbg_values > 1);
2153                         } else {
2154                                 print "PAREN('$1')\n" if ($dbg_values > 1);
2155                         }
2156
2157                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
2158                         print "FUNC($1)\n" if ($dbg_values > 1);
2159                         $type = 'V';
2160                         $av_pending = 'V';
2161
2162                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
2163                         if (defined $2 && $type eq 'C' || $type eq 'T') {
2164                                 $av_pend_colon = 'B';
2165                         } elsif ($type eq 'E') {
2166                                 $av_pend_colon = 'L';
2167                         }
2168                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
2169                         $type = 'V';
2170
2171                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
2172                         print "IDENT($1)\n" if ($dbg_values > 1);
2173                         $type = 'V';
2174
2175                 } elsif ($cur =~ /^($Assignment)/o) {
2176                         print "ASSIGN($1)\n" if ($dbg_values > 1);
2177                         $type = 'N';
2178
2179                 } elsif ($cur =~/^(;|{|})/) {
2180                         print "END($1)\n" if ($dbg_values > 1);
2181                         $type = 'E';
2182                         $av_pend_colon = 'O';
2183
2184                 } elsif ($cur =~/^(,)/) {
2185                         print "COMMA($1)\n" if ($dbg_values > 1);
2186                         $type = 'C';
2187
2188                 } elsif ($cur =~ /^(\?)/o) {
2189                         print "QUESTION($1)\n" if ($dbg_values > 1);
2190                         $type = 'N';
2191
2192                 } elsif ($cur =~ /^(:)/o) {
2193                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
2194
2195                         substr($var, length($res), 1, $av_pend_colon);
2196                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
2197                                 $type = 'E';
2198                         } else {
2199                                 $type = 'N';
2200                         }
2201                         $av_pend_colon = 'O';
2202
2203                 } elsif ($cur =~ /^(\[)/o) {
2204                         print "CLOSE($1)\n" if ($dbg_values > 1);
2205                         $type = 'N';
2206
2207                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
2208                         my $variant;
2209
2210                         print "OPV($1)\n" if ($dbg_values > 1);
2211                         if ($type eq 'V') {
2212                                 $variant = 'B';
2213                         } else {
2214                                 $variant = 'U';
2215                         }
2216
2217                         substr($var, length($res), 1, $variant);
2218                         $type = 'N';
2219
2220                 } elsif ($cur =~ /^($Operators)/o) {
2221                         print "OP($1)\n" if ($dbg_values > 1);
2222                         if ($1 ne '++' && $1 ne '--') {
2223                                 $type = 'N';
2224                         }
2225
2226                 } elsif ($cur =~ /(^.)/o) {
2227                         print "C($1)\n" if ($dbg_values > 1);
2228                 }
2229                 if (defined $1) {
2230                         $cur = substr($cur, length($1));
2231                         $res .= $type x length($1);
2232                 }
2233         }
2234
2235         return ($res, $var);
2236 }
2237
2238 sub possible {
2239         my ($possible, $line) = @_;
2240         my $notPermitted = qr{(?:
2241                 ^(?:
2242                         $Modifier|
2243                         $Storage|
2244                         $Type|
2245                         DEFINE_\S+
2246                 )$|
2247                 ^(?:
2248                         goto|
2249                         return|
2250                         case|
2251                         else|
2252                         asm|__asm__|
2253                         do|
2254                         \#|
2255                         \#\#|
2256                 )(?:\s|$)|
2257                 ^(?:typedef|struct|enum)\b
2258             )}x;
2259         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
2260         if ($possible !~ $notPermitted) {
2261                 # Check for modifiers.
2262                 $possible =~ s/\s*$Storage\s*//g;
2263                 $possible =~ s/\s*$Sparse\s*//g;
2264                 if ($possible =~ /^\s*$/) {
2265
2266                 } elsif ($possible =~ /\s/) {
2267                         $possible =~ s/\s*$Type\s*//g;
2268                         for my $modifier (split(' ', $possible)) {
2269                                 if ($modifier !~ $notPermitted) {
2270                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
2271                                         push(@modifierListFile, $modifier);
2272                                 }
2273                         }
2274
2275                 } else {
2276                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
2277                         push(@typeListFile, $possible);
2278                 }
2279                 build_types();
2280         } else {
2281                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
2282         }
2283 }
2284
2285 my $prefix = '';
2286
2287 sub show_type {
2288         my ($type) = @_;
2289
2290         $type =~ tr/[a-z]/[A-Z]/;
2291
2292         return defined $use_type{$type} if (scalar keys %use_type > 0);
2293
2294         return !defined $ignore_type{$type};
2295 }
2296
2297 sub report {
2298         my ($level, $type, $msg) = @_;
2299
2300         if (!show_type($type) ||
2301             (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
2302                 return 0;
2303         }
2304         my $output = '';
2305         if ($color) {
2306                 if ($level eq 'ERROR') {
2307                         $output .= RED;
2308                 } elsif ($level eq 'WARNING') {
2309                         $output .= YELLOW;
2310                 } else {
2311                         $output .= GREEN;
2312                 }
2313         }
2314         $output .= $prefix . $level . ':';
2315         if ($show_types) {
2316                 $output .= BLUE if ($color);
2317                 $output .= "$type:";
2318         }
2319         $output .= RESET if ($color);
2320         $output .= ' ' . $msg . "\n";
2321
2322         if ($showfile) {
2323                 my @lines = split("\n", $output, -1);
2324                 splice(@lines, 1, 1);
2325                 $output = join("\n", @lines);
2326         }
2327
2328         if ($terse) {
2329                 $output = (split('\n', $output))[0] . "\n";
2330         }
2331
2332         if ($verbose && exists($verbose_messages{$type}) &&
2333             !exists($verbose_emitted{$type})) {
2334                 $output .= $verbose_messages{$type} . "\n\n";
2335                 $verbose_emitted{$type} = 1;
2336         }
2337
2338         push(our @report, $output);
2339
2340         return 1;
2341 }
2342
2343 sub report_dump {
2344         our @report;
2345 }
2346
2347 sub fixup_current_range {
2348         my ($lineRef, $offset, $length) = @_;
2349
2350         if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) {
2351                 my $o = $1;
2352                 my $l = $2;
2353                 my $no = $o + $offset;
2354                 my $nl = $l + $length;
2355                 $$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/;
2356         }
2357 }
2358
2359 sub fix_inserted_deleted_lines {
2360         my ($linesRef, $insertedRef, $deletedRef) = @_;
2361
2362         my $range_last_linenr = 0;
2363         my $delta_offset = 0;
2364
2365         my $old_linenr = 0;
2366         my $new_linenr = 0;
2367
2368         my $next_insert = 0;
2369         my $next_delete = 0;
2370
2371         my @lines = ();
2372
2373         my $inserted = @{$insertedRef}[$next_insert++];
2374         my $deleted = @{$deletedRef}[$next_delete++];
2375
2376         foreach my $old_line (@{$linesRef}) {
2377                 my $save_line = 1;
2378                 my $line = $old_line;   #don't modify the array
2379                 if ($line =~ /^(?:\+\+\+|\-\-\-)\s+\S+/) {      #new filename
2380                         $delta_offset = 0;
2381                 } elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) {    #new hunk
2382                         $range_last_linenr = $new_linenr;
2383                         fixup_current_range(\$line, $delta_offset, 0);
2384                 }
2385
2386                 while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) {
2387                         $deleted = @{$deletedRef}[$next_delete++];
2388                         $save_line = 0;
2389                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1);
2390                 }
2391
2392                 while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) {
2393                         push(@lines, ${$inserted}{'LINE'});
2394                         $inserted = @{$insertedRef}[$next_insert++];
2395                         $new_linenr++;
2396                         fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1);
2397                 }
2398
2399                 if ($save_line) {
2400                         push(@lines, $line);
2401                         $new_linenr++;
2402                 }
2403
2404                 $old_linenr++;
2405         }
2406
2407         return @lines;
2408 }
2409
2410 sub fix_insert_line {
2411         my ($linenr, $line) = @_;
2412
2413         my $inserted = {
2414                 LINENR => $linenr,
2415                 LINE => $line,
2416         };
2417         push(@fixed_inserted, $inserted);
2418 }
2419
2420 sub fix_delete_line {
2421         my ($linenr, $line) = @_;
2422
2423         my $deleted = {
2424                 LINENR => $linenr,
2425                 LINE => $line,
2426         };
2427
2428         push(@fixed_deleted, $deleted);
2429 }
2430
2431 sub ERROR {
2432         my ($type, $msg) = @_;
2433
2434         if (report("ERROR", $type, $msg)) {
2435                 our $clean = 0;
2436                 our $cnt_error++;
2437                 return 1;
2438         }
2439         return 0;
2440 }
2441 sub WARN {
2442         my ($type, $msg) = @_;
2443
2444         if (report("WARNING", $type, $msg)) {
2445                 our $clean = 0;
2446                 our $cnt_warn++;
2447                 return 1;
2448         }
2449         return 0;
2450 }
2451 sub CHK {
2452         my ($type, $msg) = @_;
2453
2454         if ($check && report("CHECK", $type, $msg)) {
2455                 our $clean = 0;
2456                 our $cnt_chk++;
2457                 return 1;
2458         }
2459         return 0;
2460 }
2461
2462 sub check_absolute_file {
2463         my ($absolute, $herecurr) = @_;
2464         my $file = $absolute;
2465
2466         ##print "absolute<$absolute>\n";
2467
2468         # See if any suffix of this path is a path within the tree.
2469         while ($file =~ s@^[^/]*/@@) {
2470                 if (-f "$root/$file") {
2471                         ##print "file<$file>\n";
2472                         last;
2473                 }
2474         }
2475         if (! -f _)  {
2476                 return 0;
2477         }
2478
2479         # It is, so see if the prefix is acceptable.
2480         my $prefix = $absolute;
2481         substr($prefix, -length($file)) = '';
2482
2483         ##print "prefix<$prefix>\n";
2484         if ($prefix ne ".../") {
2485                 WARN("USE_RELATIVE_PATH",
2486                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
2487         }
2488 }
2489
2490 sub trim {
2491         my ($string) = @_;
2492
2493         $string =~ s/^\s+|\s+$//g;
2494
2495         return $string;
2496 }
2497
2498 sub ltrim {
2499         my ($string) = @_;
2500
2501         $string =~ s/^\s+//;
2502
2503         return $string;
2504 }
2505
2506 sub rtrim {
2507         my ($string) = @_;
2508
2509         $string =~ s/\s+$//;
2510
2511         return $string;
2512 }
2513
2514 sub string_find_replace {
2515         my ($string, $find, $replace) = @_;
2516
2517         $string =~ s/$find/$replace/g;
2518
2519         return $string;
2520 }
2521
2522 sub tabify {
2523         my ($leading) = @_;
2524
2525         my $source_indent = $tabsize;
2526         my $max_spaces_before_tab = $source_indent - 1;
2527         my $spaces_to_tab = " " x $source_indent;
2528
2529         #convert leading spaces to tabs
2530         1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g;
2531         #Remove spaces before a tab
2532         1 while $leading =~ s@^([\t]*)( {1,$max_spaces_before_tab})\t@$1\t@g;
2533
2534         return "$leading";
2535 }
2536
2537 sub pos_last_openparen {
2538         my ($line) = @_;
2539
2540         my $pos = 0;
2541
2542         my $opens = $line =~ tr/\(/\(/;
2543         my $closes = $line =~ tr/\)/\)/;
2544
2545         my $last_openparen = 0;
2546
2547         if (($opens == 0) || ($closes >= $opens)) {
2548                 return -1;
2549         }
2550
2551         my $len = length($line);
2552
2553         for ($pos = 0; $pos < $len; $pos++) {
2554                 my $string = substr($line, $pos);
2555                 if ($string =~ /^($FuncArg|$balanced_parens)/) {
2556                         $pos += length($1) - 1;
2557                 } elsif (substr($line, $pos, 1) eq '(') {
2558                         $last_openparen = $pos;
2559                 } elsif (index($string, '(') == -1) {
2560                         last;
2561                 }
2562         }
2563
2564         return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
2565 }
2566
2567 sub get_raw_comment {
2568         my ($line, $rawline) = @_;
2569         my $comment = '';
2570
2571         for my $i (0 .. (length($line) - 1)) {
2572                 if (substr($line, $i, 1) eq "$;") {
2573                         $comment .= substr($rawline, $i, 1);
2574                 }
2575         }
2576
2577         return $comment;
2578 }
2579
2580 # Args:
2581 #   line: Patch line to check
2582 #   auto: Auto variable name, e.g. "per_child_auto"
2583 #   suffix: Suffix to expect on member, e.g. "_priv"
2584 #   warning: Warning name, e.g. "PRIV_AUTO"
2585 sub u_boot_struct_name {
2586         my ($line, $auto, $suffix, $warning, $herecurr) = @_;
2587
2588         # Use _priv as a suffix for the device-private data struct
2589         if ($line =~ /^\+\s*\.${auto}\s*=\s*sizeof\(struct\((\w+)\).*/) {
2590                 my $struct_name = $1;
2591                 if ($struct_name !~ /^\w+${suffix}/) {
2592                         WARN($warning,
2593                                  "struct \'$struct_name\' should have a ${suffix} suffix\n"
2594                                  . $herecurr);
2595                 }
2596         }
2597 }
2598
2599 # Checks specific to U-Boot
2600 sub u_boot_line {
2601         my ($realfile, $line, $rawline, $herecurr) = @_;
2602
2603         # ask for a test if a new uclass ID is added
2604         if ($realfile =~ /uclass-id.h/ && $line =~ /^\+/) {
2605                 WARN("NEW_UCLASS",
2606                      "Possible new uclass - make sure to add a sandbox driver, plus a test in test/dm/<name>.c\n" . $herecurr);
2607         }
2608
2609         # try to get people to use the livetree API, except when changing tooling
2610         if ($line =~ /^\+.*fdtdec_/ && $realfile !~ /^tools\//) {
2611                 WARN("LIVETREE",
2612                      "Use the livetree API (dev_read_...)\n" . $herecurr);
2613         }
2614
2615         # add tests for new commands
2616         if ($line =~ /^\+.*do_($Ident)\(struct cmd_tbl.*/) {
2617                 WARN("CMD_TEST",
2618                      "Possible new command - make sure you add a test\n" . $herecurr);
2619         }
2620
2621         # use if instead of #if
2622         if ($realfile =~ /\.c$/ && $line =~ /^\+#if.*CONFIG.*/) {
2623                 WARN("PREFER_IF",
2624                      "Use 'if (IS_ENABLED(CONFIG...))' instead of '#if or #ifdef' where possible\n" . $herecurr);
2625         }
2626
2627         # prefer strl(cpy|cat) over strn(cpy|cat)
2628         if ($line =~ /\bstrn(cpy|cat)\s*\(/) {
2629                 WARN("STRL",
2630                      "strl$1 is preferred over strn$1 because it always produces a nul-terminated string\n" . $herecurr);
2631         }
2632
2633         # use Kconfig for all CONFIG symbols
2634         if ($line =~ /\+\s*#\s*(define|undef)\s+(CONFIG_\w*)\b/) {
2635                 ERROR("DEFINE_CONFIG_SYM",
2636                       "All CONFIG symbols are managed by Kconfig\n" . $herecurr);
2637         }
2638
2639         # Don't put common.h and dm.h in header files
2640         if ($realfile =~ /\.h$/ && $rawline =~ /^\+#include\s*<(common|dm)\.h>*/) {
2641                 ERROR("BARRED_INCLUDE_IN_HDR",
2642                       "Avoid including common.h and dm.h in header files\n" . $herecurr);
2643         }
2644
2645         # Do not disable fdt / initrd relocation
2646         if ($rawline =~ /^\+.*(fdt|initrd)_high=0xffffffff/) {
2647                 ERROR("DISABLE_FDT_OR_INITRD_RELOC",
2648                      "fdt or initrd relocation disabled at boot time\n" . $herecurr);
2649         }
2650
2651         # make sure 'skip_board_fixup' is not
2652         if ($rawline =~ /.*skip_board_fixup.*/) {
2653                 ERROR("SKIP_BOARD_FIXUP",
2654                      "Avoid setting skip_board_fixup env variable\n" . $herecurr);
2655         }
2656
2657         # Do not use CONFIG_ prefix in CONFIG_IS_ENABLED() calls
2658         if ($line =~ /^\+.*CONFIG_IS_ENABLED\(CONFIG_\w*\).*/) {
2659                 ERROR("CONFIG_IS_ENABLED_CONFIG",
2660                       "CONFIG_IS_ENABLED() takes values without the CONFIG_ prefix\n" . $herecurr);
2661         }
2662
2663         # Use _priv as a suffix for the device-private data struct
2664         if ($line =~ /^\+\s*\.priv_auto\s*=\s*sizeof\(struct\((\w+)\).*/) {
2665                 my $struct_name = $1;
2666                 if ($struct_name !~ /^\w+_priv/) {
2667                         WARN("PRIV_AUTO", "struct \'$struct_name\' should have a _priv suffix");
2668                 }
2669         }
2670
2671         # Check struct names for the 'auto' members of struct driver
2672         u_boot_struct_name($line, "priv_auto", "_priv", "PRIV_AUTO", $herecurr);
2673         u_boot_struct_name($line, "plat_auto", "_plat", "PLAT_AUTO", $herecurr);
2674         u_boot_struct_name($line, "per_child_auto", "_priv", "CHILD_PRIV_AUTO", $herecurr);
2675         u_boot_struct_name($line, "per_child_plat_auto", "_plat",
2676                 "CHILD_PLAT_AUTO", $herecurr);
2677
2678         # Now the ones for struct uclass, skipping those in common with above
2679         u_boot_struct_name($line, "per_device_auto", "_priv",
2680                 "DEVICE_PRIV_AUTO", $herecurr);
2681         u_boot_struct_name($line, "per_device_plat_auto", "_plat",
2682                 "DEVICE_PLAT_AUTO", $herecurr);
2683
2684         # Avoid using the pre-schema driver model tags
2685         if ($line =~ /^\+.*u-boot,dm-.*/) {
2686                 ERROR("PRE_SCHEMA",
2687                       "Driver model schema uses 'bootph-...' tags now\n" . $herecurr);
2688         }
2689 }
2690
2691 sub exclude_global_initialisers {
2692         my ($realfile) = @_;
2693
2694         # Do not check for BPF programs (tools/testing/selftests/bpf/progs/*.c, samples/bpf/*_kern.c, *.bpf.c).
2695         return $realfile =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
2696                 $realfile =~ m@^samples/bpf/.*_kern\.c$@ ||
2697                 $realfile =~ m@/bpf/.*\.bpf\.c$@;
2698 }
2699
2700 sub process {
2701         my $filename = shift;
2702
2703         my $linenr=0;
2704         my $prevline="";
2705         my $prevrawline="";
2706         my $stashline="";
2707         my $stashrawline="";
2708
2709         my $length;
2710         my $indent;
2711         my $previndent=0;
2712         my $stashindent=0;
2713
2714         our $clean = 1;
2715         my $signoff = 0;
2716         my $author = '';
2717         my $authorsignoff = 0;
2718         my $author_sob = '';
2719         my $is_patch = 0;
2720         my $is_binding_patch = -1;
2721         my $in_header_lines = $file ? 0 : 1;
2722         my $in_commit_log = 0;          #Scanning lines before patch
2723         my $has_patch_separator = 0;    #Found a --- line
2724         my $has_commit_log = 0;         #Encountered lines before patch
2725         my $commit_log_lines = 0;       #Number of commit log lines
2726         my $commit_log_possible_stack_dump = 0;
2727         my $commit_log_long_line = 0;
2728         my $commit_log_has_diff = 0;
2729         my $reported_maintainer_file = 0;
2730         my $non_utf8_charset = 0;
2731
2732         my $last_git_commit_id_linenr = -1;
2733
2734         my $last_blank_line = 0;
2735         my $last_coalesced_string_linenr = -1;
2736
2737         our @report = ();
2738         our $cnt_lines = 0;
2739         our $cnt_error = 0;
2740         our $cnt_warn = 0;
2741         our $cnt_chk = 0;
2742
2743         # Trace the real file/line as we go.
2744         my $realfile = '';
2745         my $realline = 0;
2746         my $realcnt = 0;
2747         my $here = '';
2748         my $context_function;           #undef'd unless there's a known function
2749         my $in_comment = 0;
2750         my $comment_edge = 0;
2751         my $first_line = 0;
2752         my $p1_prefix = '';
2753
2754         my $prev_values = 'E';
2755
2756         # suppression flags
2757         my %suppress_ifbraces;
2758         my %suppress_whiletrailers;
2759         my %suppress_export;
2760         my $suppress_statement = 0;
2761
2762         my %signatures = ();
2763
2764         # Pre-scan the patch sanitizing the lines.
2765         # Pre-scan the patch looking for any __setup documentation.
2766         #
2767         my @setup_docs = ();
2768         my $setup_docs = 0;
2769
2770         my $camelcase_file_seeded = 0;
2771
2772         my $checklicenseline = 1;
2773
2774         sanitise_line_reset();
2775         my $line;
2776         foreach my $rawline (@rawlines) {
2777                 $linenr++;
2778                 $line = $rawline;
2779
2780                 push(@fixed, $rawline) if ($fix);
2781
2782                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
2783                         $setup_docs = 0;
2784                         if ($1 =~ m@Documentation/admin-guide/kernel-parameters.txt$@) {
2785                                 $setup_docs = 1;
2786                         }
2787                         #next;
2788                 }
2789                 if ($rawline =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
2790                         $realline=$1-1;
2791                         if (defined $2) {
2792                                 $realcnt=$3+1;
2793                         } else {
2794                                 $realcnt=1+1;
2795                         }
2796                         $in_comment = 0;
2797
2798                         # Guestimate if this is a continuing comment.  Run
2799                         # the context looking for a comment "edge".  If this
2800                         # edge is a close comment then we must be in a comment
2801                         # at context start.
2802                         my $edge;
2803                         my $cnt = $realcnt;
2804                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
2805                                 next if (defined $rawlines[$ln - 1] &&
2806                                          $rawlines[$ln - 1] =~ /^-/);
2807                                 $cnt--;
2808                                 #print "RAW<$rawlines[$ln - 1]>\n";
2809                                 last if (!defined $rawlines[$ln - 1]);
2810                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
2811                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
2812                                         ($edge) = $1;
2813                                         last;
2814                                 }
2815                         }
2816                         if (defined $edge && $edge eq '*/') {
2817                                 $in_comment = 1;
2818                         }
2819
2820                         # Guestimate if this is a continuing comment.  If this
2821                         # is the start of a diff block and this line starts
2822                         # ' *' then it is very likely a comment.
2823                         if (!defined $edge &&
2824                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
2825                         {
2826                                 $in_comment = 1;
2827                         }
2828
2829                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
2830                         sanitise_line_reset($in_comment);
2831
2832                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
2833                         # Standardise the strings and chars within the input to
2834                         # simplify matching -- only bother with positive lines.
2835                         $line = sanitise_line($rawline);
2836                 }
2837                 push(@lines, $line);
2838
2839                 if ($realcnt > 1) {
2840                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
2841                 } else {
2842                         $realcnt = 0;
2843                 }
2844
2845                 #print "==>$rawline\n";
2846                 #print "-->$line\n";
2847
2848                 if ($setup_docs && $line =~ /^\+/) {
2849                         push(@setup_docs, $line);
2850                 }
2851         }
2852
2853         $prefix = '';
2854
2855         $realcnt = 0;
2856         $linenr = 0;
2857         $fixlinenr = -1;
2858         foreach my $line (@lines) {
2859                 $linenr++;
2860                 $fixlinenr++;
2861                 my $sline = $line;      #copy of $line
2862                 $sline =~ s/$;/ /g;     #with comments as spaces
2863
2864                 my $rawline = $rawlines[$linenr - 1];
2865                 my $raw_comment = get_raw_comment($line, $rawline);
2866
2867 # check if it's a mode change, rename or start of a patch
2868                 if (!$in_commit_log &&
2869                     ($line =~ /^ mode change [0-7]+ => [0-7]+ \S+\s*$/ ||
2870                     ($line =~ /^rename (?:from|to) \S+\s*$/ ||
2871                      $line =~ /^diff --git a\/[\w\/\.\_\-]+ b\/\S+\s*$/))) {
2872                         $is_patch = 1;
2873                 }
2874
2875 #extract the line range in the file after the patch is applied
2876                 if (!$in_commit_log &&
2877                     $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) {
2878                         my $context = $4;
2879                         $is_patch = 1;
2880                         $first_line = $linenr + 1;
2881                         $realline=$1-1;
2882                         if (defined $2) {
2883                                 $realcnt=$3+1;
2884                         } else {
2885                                 $realcnt=1+1;
2886                         }
2887                         annotate_reset();
2888                         $prev_values = 'E';
2889
2890                         %suppress_ifbraces = ();
2891                         %suppress_whiletrailers = ();
2892                         %suppress_export = ();
2893                         $suppress_statement = 0;
2894                         if ($context =~ /\b(\w+)\s*\(/) {
2895                                 $context_function = $1;
2896                         } else {
2897                                 undef $context_function;
2898                         }
2899                         next;
2900
2901 # track the line number as we move through the hunk, note that
2902 # new versions of GNU diff omit the leading space on completely
2903 # blank context lines so we need to count that too.
2904                 } elsif ($line =~ /^( |\+|$)/) {
2905                         $realline++;
2906                         $realcnt-- if ($realcnt != 0);
2907
2908                         # Measure the line length and indent.
2909                         ($length, $indent) = line_stats($rawline);
2910
2911                         # Track the previous line.
2912                         ($prevline, $stashline) = ($stashline, $line);
2913                         ($previndent, $stashindent) = ($stashindent, $indent);
2914                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
2915
2916                         #warn "line<$line>\n";
2917
2918                 } elsif ($realcnt == 1) {
2919                         $realcnt--;
2920                 }
2921
2922                 my $hunk_line = ($realcnt != 0);
2923
2924                 $here = "#$linenr: " if (!$file);
2925                 $here = "#$realline: " if ($file);
2926
2927                 my $found_file = 0;
2928                 # extract the filename as it passes
2929                 if ($line =~ /^diff --git.*?(\S+)$/) {
2930                         $realfile = $1;
2931                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2932                         $in_commit_log = 0;
2933                         $found_file = 1;
2934                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
2935                         $realfile = $1;
2936                         $realfile =~ s@^([^/]*)/@@ if (!$file);
2937                         $in_commit_log = 0;
2938
2939                         $p1_prefix = $1;
2940                         if (!$file && $tree && $p1_prefix ne '' &&
2941                             -e "$root/$p1_prefix") {
2942                                 WARN("PATCH_PREFIX",
2943                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
2944                         }
2945
2946                         if ($realfile =~ m@^include/asm/@) {
2947                                 ERROR("MODIFIED_INCLUDE_ASM",
2948                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
2949                         }
2950                         $found_file = 1;
2951                 }
2952
2953 #make up the handle for any error we report on this line
2954                 if ($showfile) {
2955                         $prefix = "$realfile:$realline: "
2956                 } elsif ($emacs) {
2957                         if ($file) {
2958                                 $prefix = "$filename:$realline: ";
2959                         } else {
2960                                 $prefix = "$filename:$linenr: ";
2961                         }
2962                 }
2963
2964                 if ($found_file) {
2965                         if (is_maintained_obsolete($realfile)) {
2966                                 WARN("OBSOLETE",
2967                                      "$realfile is marked as 'obsolete' in the MAINTAINERS hierarchy.  No unnecessary modifications please.\n");
2968                         }
2969                         if ($realfile =~ m@^(?:drivers/net/|net/|drivers/staging/)@) {
2970                                 $check = 1;
2971                         } else {
2972                                 $check = $check_orig;
2973                         }
2974                         $checklicenseline = 1;
2975
2976                         if ($realfile !~ /^MAINTAINERS/) {
2977                                 my $last_binding_patch = $is_binding_patch;
2978
2979                                 $is_binding_patch = () = $realfile =~ m@^(?:Documentation/devicetree/|include/dt-bindings/)@;
2980
2981                                 if (($last_binding_patch != -1) &&
2982                                     ($last_binding_patch ^ $is_binding_patch)) {
2983                                         WARN("DT_SPLIT_BINDING_PATCH",
2984                                              "DT binding docs and includes should be a separate patch. See: Documentation/devicetree/bindings/submitting-patches.rst\n");
2985                                 }
2986                         }
2987
2988                         next;
2989                 }
2990
2991                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
2992
2993                 my $hereline = "$here\n$rawline\n";
2994                 my $herecurr = "$here\n$rawline\n";
2995                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
2996
2997                 $cnt_lines++ if ($realcnt != 0);
2998
2999 # Verify the existence of a commit log if appropriate
3000 # 2 is used because a $signature is counted in $commit_log_lines
3001                 if ($in_commit_log) {
3002                         if ($line !~ /^\s*$/) {
3003                                 $commit_log_lines++;    #could be a $signature
3004                         }
3005                 } elsif ($has_commit_log && $commit_log_lines < 2) {
3006                         WARN("COMMIT_MESSAGE",
3007                              "Missing commit description - Add an appropriate one\n");
3008                         $commit_log_lines = 2;  #warn only once
3009                 }
3010
3011 # Check if the commit log has what seems like a diff which can confuse patch
3012                 if ($in_commit_log && !$commit_log_has_diff &&
3013                     (($line =~ m@^\s+diff\b.*a/([\w/]+)@ &&
3014                       $line =~ m@^\s+diff\b.*a/[\w/]+\s+b/$1\b@) ||
3015                      $line =~ m@^\s*(?:\-\-\-\s+a/|\+\+\+\s+b/)@ ||
3016                      $line =~ m/^\s*\@\@ \-\d+,\d+ \+\d+,\d+ \@\@/)) {
3017                         ERROR("DIFF_IN_COMMIT_MSG",
3018                               "Avoid using diff content in the commit message - patch(1) might not work\n" . $herecurr);
3019                         $commit_log_has_diff = 1;
3020                 }
3021
3022 # Check for incorrect file permissions
3023                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
3024                         my $permhere = $here . "FILE: $realfile\n";
3025                         if ($realfile !~ m@scripts/@ &&
3026                             $realfile !~ /\.(py|pl|awk|sh)$/) {
3027                                 ERROR("EXECUTE_PERMISSIONS",
3028                                       "do not set execute permissions for source files\n" . $permhere);
3029                         }
3030                 }
3031
3032 # Check the patch for a From:
3033                 if (decode("MIME-Header", $line) =~ /^From:\s*(.*)/) {
3034                         $author = $1;
3035                         my $curline = $linenr;
3036                         while(defined($rawlines[$curline]) && ($rawlines[$curline++] =~ /^[ \t]\s*(.*)/)) {
3037                                 $author .= $1;
3038                         }
3039                         $author = encode("utf8", $author) if ($line =~ /=\?utf-8\?/i);
3040                         $author =~ s/"//g;
3041                         $author = reformat_email($author);
3042                 }
3043
3044 # Check the patch for a signoff:
3045                 if ($line =~ /^\s*signed-off-by:\s*(.*)/i) {
3046                         $signoff++;
3047                         $in_commit_log = 0;
3048                         if ($author ne ''  && $authorsignoff != 1) {
3049                                 if (same_email_addresses($1, $author)) {
3050                                         $authorsignoff = 1;
3051                                 } else {
3052                                         my $ctx = $1;
3053                                         my ($email_name, $email_comment, $email_address, $comment1) = parse_email($ctx);
3054                                         my ($author_name, $author_comment, $author_address, $comment2) = parse_email($author);
3055
3056                                         if (lc $email_address eq lc $author_address && $email_name eq $author_name) {
3057                                                 $author_sob = $ctx;
3058                                                 $authorsignoff = 2;
3059                                         } elsif (lc $email_address eq lc $author_address) {
3060                                                 $author_sob = $ctx;
3061                                                 $authorsignoff = 3;
3062                                         } elsif ($email_name eq $author_name) {
3063                                                 $author_sob = $ctx;
3064                                                 $authorsignoff = 4;
3065
3066                                                 my $address1 = $email_address;
3067                                                 my $address2 = $author_address;
3068
3069                                                 if ($address1 =~ /(\S+)\+\S+(\@.*)/) {
3070                                                         $address1 = "$1$2";
3071                                                 }
3072                                                 if ($address2 =~ /(\S+)\+\S+(\@.*)/) {
3073                                                         $address2 = "$1$2";
3074                                                 }
3075                                                 if ($address1 eq $address2) {
3076                                                         $authorsignoff = 5;
3077                                                 }
3078                                         }
3079                                 }
3080                         }
3081                 }
3082
3083 # Check for patch separator
3084                 if ($line =~ /^---$/) {
3085                         $has_patch_separator = 1;
3086                         $in_commit_log = 0;
3087                 }
3088
3089 # Check if MAINTAINERS is being updated.  If so, there's probably no need to
3090 # emit the "does MAINTAINERS need updating?" message on file add/move/delete
3091                 if ($line =~ /^\s*MAINTAINERS\s*\|/) {
3092                         $reported_maintainer_file = 1;
3093                 }
3094
3095 # Check signature styles
3096                 if (!$in_header_lines &&
3097                     $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
3098                         my $space_before = $1;
3099                         my $sign_off = $2;
3100                         my $space_after = $3;
3101                         my $email = $4;
3102                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
3103
3104                         if ($sign_off !~ /$signature_tags/) {
3105                                 my $suggested_signature = find_standard_signature($sign_off);
3106                                 if ($suggested_signature eq "") {
3107                                         WARN("BAD_SIGN_OFF",
3108                                              "Non-standard signature: $sign_off\n" . $herecurr);
3109                                 } else {
3110                                         if (WARN("BAD_SIGN_OFF",
3111                                                  "Non-standard signature: '$sign_off' - perhaps '$suggested_signature'?\n" . $herecurr) &&
3112                                             $fix) {
3113                                                 $fixed[$fixlinenr] =~ s/$sign_off/$suggested_signature/;
3114                                         }
3115                                 }
3116                         }
3117                         if (defined $space_before && $space_before ne "") {
3118                                 if (WARN("BAD_SIGN_OFF",
3119                                          "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) &&
3120                                     $fix) {
3121                                         $fixed[$fixlinenr] =
3122                                             "$ucfirst_sign_off $email";
3123                                 }
3124                         }
3125                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
3126                                 if (WARN("BAD_SIGN_OFF",
3127                                          "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) &&
3128                                     $fix) {
3129                                         $fixed[$fixlinenr] =
3130                                             "$ucfirst_sign_off $email";
3131                                 }
3132
3133                         }
3134                         if (!defined $space_after || $space_after ne " ") {
3135                                 if (WARN("BAD_SIGN_OFF",
3136                                          "Use a single space after $ucfirst_sign_off\n" . $herecurr) &&
3137                                     $fix) {
3138                                         $fixed[$fixlinenr] =
3139                                             "$ucfirst_sign_off $email";
3140                                 }
3141                         }
3142
3143                         my ($email_name, $name_comment, $email_address, $comment) = parse_email($email);
3144                         my $suggested_email = format_email(($email_name, $name_comment, $email_address, $comment));
3145                         if ($suggested_email eq "") {
3146                                 ERROR("BAD_SIGN_OFF",
3147                                       "Unrecognized email address: '$email'\n" . $herecurr);
3148                         } else {
3149                                 my $dequoted = $suggested_email;
3150                                 $dequoted =~ s/^"//;
3151                                 $dequoted =~ s/" </ </;
3152                                 # Don't force email to have quotes
3153                                 # Allow just an angle bracketed address
3154                                 if (!same_email_addresses($email, $suggested_email)) {
3155                                         if (WARN("BAD_SIGN_OFF",
3156                                                  "email address '$email' might be better as '$suggested_email'\n" . $herecurr) &&
3157                                             $fix) {
3158                                                 $fixed[$fixlinenr] =~ s/\Q$email\E/$suggested_email/;
3159                                         }
3160                                 }
3161
3162                                 # Address part shouldn't have comments
3163                                 my $stripped_address = $email_address;
3164                                 $stripped_address =~ s/\([^\(\)]*\)//g;
3165                                 if ($email_address ne $stripped_address) {
3166                                         if (WARN("BAD_SIGN_OFF",
3167                                                  "address part of email should not have comments: '$email_address'\n" . $herecurr) &&
3168                                             $fix) {
3169                                                 $fixed[$fixlinenr] =~ s/\Q$email_address\E/$stripped_address/;
3170                                         }
3171                                 }
3172
3173                                 # Only one name comment should be allowed
3174                                 my $comment_count = () = $name_comment =~ /\([^\)]+\)/g;
3175                                 if ($comment_count > 1) {
3176                                         WARN("BAD_SIGN_OFF",
3177                                              "Use a single name comment in email: '$email'\n" . $herecurr);
3178                                 }
3179
3180
3181                                 # stable@vger.kernel.org or stable@kernel.org shouldn't
3182                                 # have an email name. In addition comments should strictly
3183                                 # begin with a #
3184                                 if ($email =~ /^.*stable\@(?:vger\.)?kernel\.org/i) {
3185                                         if (($comment ne "" && $comment !~ /^#.+/) ||
3186                                             ($email_name ne "")) {
3187                                                 my $cur_name = $email_name;
3188                                                 my $new_comment = $comment;
3189                                                 $cur_name =~ s/[a-zA-Z\s\-\"]+//g;
3190
3191                                                 # Remove brackets enclosing comment text
3192                                                 # and # from start of comments to get comment text
3193                                                 $new_comment =~ s/^\((.*)\)$/$1/;
3194                                                 $new_comment =~ s/^\[(.*)\]$/$1/;
3195                                                 $new_comment =~ s/^[\s\#]+|\s+$//g;
3196
3197                                                 $new_comment = trim("$new_comment $cur_name") if ($cur_name ne $new_comment);
3198                                                 $new_comment = " # $new_comment" if ($new_comment ne "");
3199                                                 my $new_email = "$email_address$new_comment";
3200
3201                                                 if (WARN("BAD_STABLE_ADDRESS_STYLE",
3202                                                          "Invalid email format for stable: '$email', prefer '$new_email'\n" . $herecurr) &&
3203                                                     $fix) {
3204                                                         $fixed[$fixlinenr] =~ s/\Q$email\E/$new_email/;
3205                                                 }
3206                                         }
3207                                 } elsif ($comment ne "" && $comment !~ /^(?:#.+|\(.+\))$/) {
3208                                         my $new_comment = $comment;
3209
3210                                         # Extract comment text from within brackets or
3211                                         # c89 style /*...*/ comments
3212                                         $new_comment =~ s/^\[(.*)\]$/$1/;
3213                                         $new_comment =~ s/^\/\*(.*)\*\/$/$1/;
3214
3215                                         $new_comment = trim($new_comment);
3216                                         $new_comment =~ s/^[^\w]$//; # Single lettered comment with non word character is usually a typo
3217                                         $new_comment = "($new_comment)" if ($new_comment ne "");
3218                                         my $new_email = format_email($email_name, $name_comment, $email_address, $new_comment);
3219
3220                                         if (WARN("BAD_SIGN_OFF",
3221                                                  "Unexpected content after email: '$email', should be: '$new_email'\n" . $herecurr) &&
3222                                             $fix) {
3223                                                 $fixed[$fixlinenr] =~ s/\Q$email\E/$new_email/;
3224                                         }
3225                                 }
3226                         }
3227
3228 # Check for duplicate signatures
3229                         my $sig_nospace = $line;
3230                         $sig_nospace =~ s/\s//g;
3231                         $sig_nospace = lc($sig_nospace);
3232                         if (defined $signatures{$sig_nospace}) {
3233                                 WARN("BAD_SIGN_OFF",
3234                                      "Duplicate signature\n" . $herecurr);
3235                         } else {
3236                                 $signatures{$sig_nospace} = 1;
3237                         }
3238
3239 # Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
3240                         if ($sign_off =~ /^co-developed-by:$/i) {
3241                                 if ($email eq $author) {
3242                                         WARN("BAD_SIGN_OFF",
3243                                               "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
3244                                 }
3245                                 if (!defined $lines[$linenr]) {
3246                                         WARN("BAD_SIGN_OFF",
3247                                              "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline);
3248                                 } elsif ($rawlines[$linenr] !~ /^\s*signed-off-by:\s*(.*)/i) {
3249                                         WARN("BAD_SIGN_OFF",
3250                                              "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
3251                                 } elsif ($1 ne $email) {
3252                                         WARN("BAD_SIGN_OFF",
3253                                              "Co-developed-by and Signed-off-by: name/email do not match \n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
3254                                 }
3255                         }
3256                 }
3257
3258 # Check email subject for common tools that don't need to be mentioned
3259                 if ($in_header_lines &&
3260                     $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
3261                         WARN("EMAIL_SUBJECT",
3262                              "A patch subject line should describe the change not the tool that found it\n" . $herecurr);
3263                 }
3264
3265 # Check for Gerrit Change-Ids not in any patch context
3266                 if ($realfile eq '' && !$has_patch_separator && $line =~ /^\s*change-id:/i) {
3267                         if (ERROR("GERRIT_CHANGE_ID",
3268                                   "Remove Gerrit Change-Id's before submitting upstream\n" . $herecurr) &&
3269                             $fix) {
3270                                 fix_delete_line($fixlinenr, $rawline);
3271                         }
3272                 }
3273
3274 # Check if the commit log is in a possible stack dump
3275                 if ($in_commit_log && !$commit_log_possible_stack_dump &&
3276                     ($line =~ /^\s*(?:WARNING:|BUG:)/ ||
3277                      $line =~ /^\s*\[\s*\d+\.\d{6,6}\s*\]/ ||
3278                                         # timestamp
3279                      $line =~ /^\s*\[\<[0-9a-fA-F]{8,}\>\]/) ||
3280                      $line =~ /^(?:\s+\w+:\s+[0-9a-fA-F]+){3,3}/ ||
3281                      $line =~ /^\s*\#\d+\s*\[[0-9a-fA-F]+\]\s*\w+ at [0-9a-fA-F]+/) {
3282                                         # stack dump address styles
3283                         $commit_log_possible_stack_dump = 1;
3284                 }
3285
3286 # Check for line lengths > 75 in commit log, warn once
3287                 if ($in_commit_log && !$commit_log_long_line &&
3288                     length($line) > 75 &&
3289                     !($line =~ /^\s*[a-zA-Z0-9_\/\.]+\s+\|\s+\d+/ ||
3290                                         # file delta changes
3291                       $line =~ /^\s*(?:[\w\.\-]+\/)++[\w\.\-]+:/ ||
3292                                         # filename then :
3293                       $line =~ /^\s*(?:Fixes:|Link:|$signature_tags)/i ||
3294                                         # A Fixes: or Link: line or signature tag line
3295                       $commit_log_possible_stack_dump)) {
3296                         WARN("COMMIT_LOG_LONG_LINE",
3297                              "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr);
3298                         $commit_log_long_line = 1;
3299                 }
3300
3301 # Reset possible stack dump if a blank line is found
3302                 if ($in_commit_log && $commit_log_possible_stack_dump &&
3303                     $line =~ /^\s*$/) {
3304                         $commit_log_possible_stack_dump = 0;
3305                 }
3306
3307 # Check for lines starting with a #
3308                 if ($in_commit_log && $line =~ /^#/) {
3309                         if (WARN("COMMIT_COMMENT_SYMBOL",
3310                                  "Commit log lines starting with '#' are dropped by git as comments\n" . $herecurr) &&
3311                             $fix) {
3312                                 $fixed[$fixlinenr] =~ s/^/ /;
3313                         }
3314                 }
3315
3316 # Check for git id commit length and improperly formed commit descriptions
3317 # A correctly formed commit description is:
3318 #    commit <SHA-1 hash length 12+ chars> ("Complete commit subject")
3319 # with the commit subject '("' prefix and '")' suffix
3320 # This is a fairly compilicated block as it tests for what appears to be
3321 # bare SHA-1 hash with  minimum length of 5.  It also avoids several types of
3322 # possible SHA-1 matches.
3323 # A commit match can span multiple lines so this block attempts to find a
3324 # complete typical commit on a maximum of 3 lines
3325                 if ($perl_version_ok &&
3326                     $in_commit_log && !$commit_log_possible_stack_dump &&
3327                     $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink|base-commit):/i &&
3328                     $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
3329                     (($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
3330                       ($line =~ /\bcommit\s*$/i && defined($rawlines[$linenr]) && $rawlines[$linenr] =~ /^\s*[0-9a-f]{5,}\b/i)) ||
3331                      ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
3332                       $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&
3333                       $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i))) {
3334                         my $init_char = "c";
3335                         my $orig_commit = "";
3336                         my $short = 1;
3337                         my $long = 0;
3338                         my $case = 1;
3339                         my $space = 1;
3340                         my $id = '0123456789ab';
3341                         my $orig_desc = "commit description";
3342                         my $description = "";
3343                         my $herectx = $herecurr;
3344                         my $has_parens = 0;
3345                         my $has_quotes = 0;
3346
3347                         my $input = $line;
3348                         if ($line =~ /(?:\bcommit\s+[0-9a-f]{5,}|\bcommit\s*$)/i) {
3349                                 for (my $n = 0; $n < 2; $n++) {
3350                                         if ($input =~ /\bcommit\s+[0-9a-f]{5,}\s*($balanced_parens)/i) {
3351                                                 $orig_desc = $1;
3352                                                 $has_parens = 1;
3353                                                 # Always strip leading/trailing parens then double quotes if existing
3354                                                 $orig_desc = substr($orig_desc, 1, -1);
3355                                                 if ($orig_desc =~ /^".*"$/) {
3356                                                         $orig_desc = substr($orig_desc, 1, -1);
3357                                                         $has_quotes = 1;
3358                                                 }
3359                                                 last;
3360                                         }
3361                                         last if ($#lines < $linenr + $n);
3362                                         $input .= " " . trim($rawlines[$linenr + $n]);
3363                                         $herectx .= "$rawlines[$linenr + $n]\n";
3364                                 }
3365                                 $herectx = $herecurr if (!$has_parens);
3366                         }
3367
3368                         if ($input =~ /\b(c)ommit\s+([0-9a-f]{5,})\b/i) {
3369                                 $init_char = $1;
3370                                 $orig_commit = lc($2);
3371                                 $short = 0 if ($input =~ /\bcommit\s+[0-9a-f]{12,40}/i);
3372                                 $long = 1 if ($input =~ /\bcommit\s+[0-9a-f]{41,}/i);
3373                                 $space = 0 if ($input =~ /\bcommit [0-9a-f]/i);
3374                                 $case = 0 if ($input =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/);
3375                         } elsif ($input =~ /\b([0-9a-f]{12,40})\b/i) {
3376                                 $orig_commit = lc($1);
3377                         }
3378
3379                         ($id, $description) = git_commit_info($orig_commit,
3380                                                               $id, $orig_desc);
3381
3382                         if (defined($id) &&
3383                             ($short || $long || $space || $case || ($orig_desc ne $description) || !$has_quotes) &&
3384                             $last_git_commit_id_linenr != $linenr - 1) {
3385                                 ERROR("GIT_COMMIT_ID",
3386                                       "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'\n" . $herectx);
3387                         }
3388                         #don't report the next line if this line ends in commit and the sha1 hash is the next line
3389                         $last_git_commit_id_linenr = $linenr if ($line =~ /\bcommit\s*$/i);
3390                 }
3391
3392 # Check for added, moved or deleted files
3393                 if (!$reported_maintainer_file && !$in_commit_log &&
3394                     ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
3395                      $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
3396                      ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
3397                       (defined($1) || defined($2))))) {
3398                         $is_patch = 1;
3399                         $reported_maintainer_file = 1;
3400                         WARN("FILE_PATH_CHANGES",
3401                              "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
3402                 }
3403
3404 # Check for adding new DT bindings not in schema format
3405                 if (!$in_commit_log &&
3406                     ($line =~ /^new file mode\s*\d+\s*$/) &&
3407                     ($realfile =~ m@^Documentation/devicetree/bindings/.*\.txt$@)) {
3408                         WARN("DT_SCHEMA_BINDING_PATCH",
3409                              "DT bindings should be in DT schema format. See: Documentation/devicetree/bindings/writing-schema.rst\n");
3410                 }
3411
3412 # Check for wrappage within a valid hunk of the file
3413                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
3414                         ERROR("CORRUPTED_PATCH",
3415                               "patch seems to be corrupt (line wrapped?)\n" .
3416                                 $herecurr) if (!$emitted_corrupt++);
3417                 }
3418
3419 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
3420                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
3421                     $rawline !~ m/^$UTF8*$/) {
3422                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
3423
3424                         my $blank = copy_spacing($rawline);
3425                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
3426                         my $hereptr = "$hereline$ptr\n";
3427
3428                         CHK("INVALID_UTF8",
3429                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
3430                 }
3431
3432 # Check if it's the start of a commit log
3433 # (not a header line and we haven't seen the patch filename)
3434                 if ($in_header_lines && $realfile =~ /^$/ &&
3435                     !($rawline =~ /^\s+(?:\S|$)/ ||
3436                       $rawline =~ /^(?:commit\b|from\b|[\w-]+:)/i)) {
3437                         $in_header_lines = 0;
3438                         $in_commit_log = 1;
3439                         $has_commit_log = 1;
3440                 }
3441
3442 # Check if there is UTF-8 in a commit log when a mail header has explicitly
3443 # declined it, i.e defined some charset where it is missing.
3444                 if ($in_header_lines &&
3445                     $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
3446                     $1 !~ /utf-8/i) {
3447                         $non_utf8_charset = 1;
3448                 }
3449
3450                 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
3451                     $rawline =~ /$NON_ASCII_UTF8/) {
3452                         WARN("UTF8_BEFORE_PATCH",
3453                             "8-bit UTF-8 used in possible commit log\n" . $herecurr);
3454                 }
3455
3456 # Check for absolute kernel paths in commit message
3457                 if ($tree && $in_commit_log) {
3458                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
3459                                 my $file = $1;
3460
3461                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
3462                                     check_absolute_file($1, $herecurr)) {
3463                                         #
3464                                 } else {
3465                                         check_absolute_file($file, $herecurr);
3466                                 }
3467                         }
3468                 }
3469
3470 # Check for various typo / spelling mistakes
3471                 if (defined($misspellings) &&
3472                     ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
3473                         while ($rawline =~ /(?:^|[^\w\-'`])($misspellings)(?:[^\w\-'`]|$)/gi) {
3474                                 my $typo = $1;
3475                                 my $blank = copy_spacing($rawline);
3476                                 my $ptr = substr($blank, 0, $-[1]) . "^" x length($typo);
3477                                 my $hereptr = "$hereline$ptr\n";
3478                                 my $typo_fix = $spelling_fix{lc($typo)};
3479                                 $typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
3480                                 $typo_fix = uc($typo_fix) if ($typo =~ /^[A-Z]+$/);
3481                                 my $msg_level = \&WARN;
3482                                 $msg_level = \&CHK if ($file);
3483                                 if (&{$msg_level}("TYPO_SPELLING",
3484                                                   "'$typo' may be misspelled - perhaps '$typo_fix'?\n" . $hereptr) &&
3485                                     $fix) {
3486                                         $fixed[$fixlinenr] =~ s/(^|[^A-Za-z@])($typo)($|[^A-Za-z@])/$1$typo_fix$3/;
3487                                 }
3488                         }
3489                 }
3490
3491 # check for invalid commit id
3492                 if ($in_commit_log && $line =~ /(^fixes:|\bcommit)\s+([0-9a-f]{6,40})\b/i) {
3493                         my $id;
3494                         my $description;
3495                         ($id, $description) = git_commit_info($2, undef, undef);
3496                         if (!defined($id)) {
3497                                 WARN("UNKNOWN_COMMIT_ID",
3498                                      "Unknown commit id '$2', maybe rebased or not pulled?\n" . $herecurr);
3499                         }
3500                 }
3501
3502 # check for repeated words separated by a single space
3503 # avoid false positive from list command eg, '-rw-r--r-- 1 root root'
3504                 if (($rawline =~ /^\+/ || $in_commit_log) &&
3505                     $rawline !~ /[bcCdDlMnpPs\?-][rwxsStT-]{9}/) {
3506                         pos($rawline) = 1 if (!$in_commit_log);
3507                         while ($rawline =~ /\b($word_pattern) (?=($word_pattern))/g) {
3508
3509                                 my $first = $1;
3510                                 my $second = $2;
3511                                 my $start_pos = $-[1];
3512                                 my $end_pos = $+[2];
3513                                 if ($first =~ /(?:struct|union|enum)/) {
3514                                         pos($rawline) += length($first) + length($second) + 1;
3515                                         next;
3516                                 }
3517
3518                                 next if (lc($first) ne lc($second));
3519                                 next if ($first eq 'long');
3520
3521                                 # check for character before and after the word matches
3522                                 my $start_char = '';
3523                                 my $end_char = '';
3524                                 $start_char = substr($rawline, $start_pos - 1, 1) if ($start_pos > ($in_commit_log ? 0 : 1));
3525                                 $end_char = substr($rawline, $end_pos, 1) if ($end_pos < length($rawline));
3526
3527                                 next if ($start_char =~ /^\S$/);
3528                                 next if (index(" \t.,;?!", $end_char) == -1);
3529
3530                                 # avoid repeating hex occurrences like 'ff ff fe 09 ...'
3531                                 if ($first =~ /\b[0-9a-f]{2,}\b/i) {
3532                                         next if (!exists($allow_repeated_words{lc($first)}));
3533                                 }
3534
3535                                 if (WARN("REPEATED_WORD",
3536                                          "Possible repeated word: '$first'\n" . $herecurr) &&
3537                                     $fix) {
3538                                         $fixed[$fixlinenr] =~ s/\b$first $second\b/$first/;
3539                                 }
3540                         }
3541
3542                         # if it's a repeated word on consecutive lines in a comment block
3543                         if ($prevline =~ /$;+\s*$/ &&
3544                             $prevrawline =~ /($word_pattern)\s*$/) {
3545                                 my $last_word = $1;
3546                                 if ($rawline =~ /^\+\s*\*\s*$last_word /) {
3547                                         if (WARN("REPEATED_WORD",
3548                                                  "Possible repeated word: '$last_word'\n" . $hereprev) &&
3549                                             $fix) {
3550                                                 $fixed[$fixlinenr] =~ s/(\+\s*\*\s*)$last_word /$1/;
3551                                         }
3552                                 }
3553                         }
3554                 }
3555
3556 # ignore non-hunk lines and lines being removed
3557                 next if (!$hunk_line || $line =~ /^-/);
3558
3559 #trailing whitespace
3560                 if ($line =~ /^\+.*\015/) {
3561                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3562                         if (ERROR("DOS_LINE_ENDINGS",
3563                                   "DOS line endings\n" . $herevet) &&
3564                             $fix) {
3565                                 $fixed[$fixlinenr] =~ s/[\s\015]+$//;
3566                         }
3567                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
3568                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3569                         if (ERROR("TRAILING_WHITESPACE",
3570                                   "trailing whitespace\n" . $herevet) &&
3571                             $fix) {
3572                                 $fixed[$fixlinenr] =~ s/\s+$//;
3573                         }
3574
3575                         $rpt_cleaners = 1;
3576                 }
3577
3578 # Check for FSF mailing addresses.
3579                 if ($rawline =~ /\bwrite to the Free/i ||
3580                     $rawline =~ /\b675\s+Mass\s+Ave/i ||
3581                     $rawline =~ /\b59\s+Temple\s+Pl/i ||
3582                     $rawline =~ /\b51\s+Franklin\s+St/i) {
3583                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3584                         my $msg_level = \&ERROR;
3585                         $msg_level = \&CHK if ($file);
3586                         &{$msg_level}("FSF_MAILING_ADDRESS",
3587                                       "Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL.\n" . $herevet)
3588                 }
3589
3590 # check for Kconfig help text having a real description
3591 # Only applies when adding the entry originally, after that we do not have
3592 # sufficient context to determine whether it is indeed long enough.
3593                 if ($realfile =~ /Kconfig/ &&
3594                     # 'choice' is usually the last thing on the line (though
3595                     # Kconfig supports named choices), so use a word boundary
3596                     # (\b) rather than a whitespace character (\s)
3597                     $line =~ /^\+\s*(?:config|menuconfig|choice)\b/) {
3598                         my $length = 0;
3599                         my $cnt = $realcnt;
3600                         my $ln = $linenr + 1;
3601                         my $f;
3602                         my $is_start = 0;
3603                         my $is_end = 0;
3604                         for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
3605                                 $f = $lines[$ln - 1];
3606                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
3607                                 $is_end = $lines[$ln - 1] =~ /^\+/;
3608
3609                                 next if ($f =~ /^-/);
3610                                 last if (!$file && $f =~ /^\@\@/);
3611
3612                                 if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate|prompt)\s*["']/) {
3613                                         $is_start = 1;
3614                                 } elsif ($lines[$ln - 1] =~ /^\+\s*(?:---)?help(?:---)?$/) {
3615                                         $length = -1;
3616                                 }
3617
3618                                 $f =~ s/^.//;
3619                                 $f =~ s/#.*//;
3620                                 $f =~ s/^\s+//;
3621                                 next if ($f =~ /^$/);
3622
3623                                 # This only checks context lines in the patch
3624                                 # and so hopefully shouldn't trigger false
3625                                 # positives, even though some of these are
3626                                 # common words in help texts
3627                                 if ($f =~ /^\s*(?:config|menuconfig|choice|endchoice|
3628                                                   if|endif|menu|endmenu|source)\b/x) {
3629                                         $is_end = 1;
3630                                         last;
3631                                 }
3632                                 $length++;
3633                         }
3634                         if ($is_start && $is_end && $length < $min_conf_desc_length) {
3635                                 WARN("CONFIG_DESCRIPTION",
3636                                      "please write a paragraph that describes the config symbol fully\n" . $herecurr);
3637                         }
3638                         #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
3639                 }
3640
3641 # check MAINTAINERS entries
3642                 if ($realfile =~ /^MAINTAINERS$/) {
3643 # check MAINTAINERS entries for the right form
3644                         if ($rawline =~ /^\+[A-Z]:/ &&
3645                             $rawline !~ /^\+[A-Z]:\t\S/) {
3646                                 if (WARN("MAINTAINERS_STYLE",
3647                                          "MAINTAINERS entries use one tab after TYPE:\n" . $herecurr) &&
3648                                     $fix) {
3649                                         $fixed[$fixlinenr] =~ s/^(\+[A-Z]):\s*/$1:\t/;
3650                                 }
3651                         }
3652 # check MAINTAINERS entries for the right ordering too
3653                         my $preferred_order = 'MRLSWQBCPTFXNK';
3654                         if ($rawline =~ /^\+[A-Z]:/ &&
3655                             $prevrawline =~ /^[\+ ][A-Z]:/) {
3656                                 $rawline =~ /^\+([A-Z]):\s*(.*)/;
3657                                 my $cur = $1;
3658                                 my $curval = $2;
3659                                 $prevrawline =~ /^[\+ ]([A-Z]):\s*(.*)/;
3660                                 my $prev = $1;
3661                                 my $prevval = $2;
3662                                 my $curindex = index($preferred_order, $cur);
3663                                 my $previndex = index($preferred_order, $prev);
3664                                 if ($curindex < 0) {
3665                                         WARN("MAINTAINERS_STYLE",
3666                                              "Unknown MAINTAINERS entry type: '$cur'\n" . $herecurr);
3667                                 } else {
3668                                         if ($previndex >= 0 && $curindex < $previndex) {
3669                                                 WARN("MAINTAINERS_STYLE",
3670                                                      "Misordered MAINTAINERS entry - list '$cur:' before '$prev:'\n" . $hereprev);
3671                                         } elsif ((($prev eq 'F' && $cur eq 'F') ||
3672                                                   ($prev eq 'X' && $cur eq 'X')) &&
3673                                                  ($prevval cmp $curval) > 0) {
3674                                                 WARN("MAINTAINERS_STYLE",
3675                                                      "Misordered MAINTAINERS entry - list file patterns in alphabetic order\n" . $hereprev);
3676                                         }
3677                                 }
3678                         }
3679                 }
3680
3681                 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
3682                     ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
3683                         my $flag = $1;
3684                         my $replacement = {
3685                                 'EXTRA_AFLAGS' =>   'asflags-y',
3686                                 'EXTRA_CFLAGS' =>   'ccflags-y',
3687                                 'EXTRA_CPPFLAGS' => 'cppflags-y',
3688                                 'EXTRA_LDFLAGS' =>  'ldflags-y',
3689                         };
3690
3691                         WARN("DEPRECATED_VARIABLE",
3692                              "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
3693                 }
3694
3695 # check for DT compatible documentation
3696                 if (defined $root &&
3697                         (($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
3698                          ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) {
3699
3700                         my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;
3701
3702                         my $dt_path = $root . "/Documentation/devicetree/bindings/";
3703                         my $vp_file = $dt_path . "vendor-prefixes.yaml";
3704
3705                         foreach my $compat (@compats) {
3706                                 my $compat2 = $compat;
3707                                 $compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
3708                                 my $compat3 = $compat;
3709                                 $compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
3710                                 `grep -Erq "$compat|$compat2|$compat3" $dt_path`;
3711                                 if ( $? >> 8 ) {
3712                                         WARN("UNDOCUMENTED_DT_STRING",
3713                                              "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
3714                                 }
3715
3716                                 next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
3717                                 my $vendor = $1;
3718                                 `grep -Eq "\\"\\^\Q$vendor\E,\\.\\*\\":" $vp_file`;
3719                                 if ( $? >> 8 ) {
3720                                         WARN("UNDOCUMENTED_DT_STRING",
3721                                              "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);
3722                                 }
3723                         }
3724                 }
3725
3726 # check for using SPDX license tag at beginning of files
3727                 if ($realline == $checklicenseline) {
3728                         if ($rawline =~ /^[ \+]\s*\#\!\s*\//) {
3729                                 $checklicenseline = 2;
3730                         } elsif ($rawline =~ /^\+/) {
3731                                 my $comment = "";
3732                                 if ($realfile =~ /\.(h|s|S)$/) {
3733                                         $comment = '/*';
3734                                 } elsif ($realfile =~ /\.(c|dts|dtsi)$/) {
3735                                         $comment = '//';
3736                                 } elsif (($checklicenseline == 2) || $realfile =~ /\.(sh|pl|py|awk|tc|yaml)$/) {
3737                                         $comment = '#';
3738                                 } elsif ($realfile =~ /\.rst$/) {
3739                                         $comment = '..';
3740                                 }
3741
3742 # check SPDX comment style for .[chsS] files
3743                                 if ($realfile =~ /\.[chsS]$/ &&
3744                                     $rawline =~ /SPDX-License-Identifier:/ &&
3745                                     $rawline !~ m@^\+\s*\Q$comment\E\s*@) {
3746                                         WARN("SPDX_LICENSE_TAG",
3747                                              "Improper SPDX comment style for '$realfile', please use '$comment' instead\n" . $herecurr);
3748                                 }
3749
3750                                 if ($comment !~ /^$/ &&
3751                                     $rawline !~ m@^\+\Q$comment\E SPDX-License-Identifier: @) {
3752                                         WARN("SPDX_LICENSE_TAG",
3753                                              "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
3754                                 } elsif ($rawline =~ /(SPDX-License-Identifier: .*)/) {
3755                                         my $spdx_license = $1;
3756                                         if (!is_SPDX_License_valid($spdx_license)) {
3757                                                 WARN("SPDX_LICENSE_TAG",
3758                                                      "'$spdx_license' is not supported in LICENSES/...\n" . $herecurr);
3759                                         }
3760                                         if ($realfile =~ m@^Documentation/devicetree/bindings/@ &&
3761                                             not $spdx_license =~ /GPL-2\.0.*BSD-2-Clause/) {
3762                                                 my $msg_level = \&WARN;
3763                                                 $msg_level = \&CHK if ($file);
3764                                                 if (&{$msg_level}("SPDX_LICENSE_TAG",
3765
3766                                                                   "DT binding documents should be licensed (GPL-2.0-only OR BSD-2-Clause)\n" . $herecurr) &&
3767                                                     $fix) {
3768                                                         $fixed[$fixlinenr] =~ s/SPDX-License-Identifier: .*/SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)/;
3769                                                 }
3770                                         }
3771                                 }
3772                         }
3773                 }
3774
3775 # check for embedded filenames
3776                 if ($rawline =~ /^\+.*\Q$realfile\E/) {
3777                         WARN("EMBEDDED_FILENAME",
3778                              "It's generally not useful to have the filename in the file\n" . $herecurr);
3779                 }
3780
3781 # check we are in a valid source file if not then ignore this hunk
3782                 next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);
3783
3784 # check for using SPDX-License-Identifier on the wrong line number
3785                 if ($realline != $checklicenseline &&
3786                     $rawline =~ /\bSPDX-License-Identifier:/ &&
3787                     substr($line, @-, @+ - @-) eq "$;" x (@+ - @-)) {
3788                         WARN("SPDX_LICENSE_TAG",
3789                              "Misplaced SPDX-License-Identifier tag - use line $checklicenseline instead\n" . $herecurr);
3790                 }
3791
3792 # line length limit (with some exclusions)
3793 #
3794 # There are a few types of lines that may extend beyond $max_line_length:
3795 #       logging functions like pr_info that end in a string
3796 #       lines with a single string
3797 #       #defines that are a single string
3798 #       lines with an RFC3986 like URL
3799 #
3800 # There are 3 different line length message types:
3801 # LONG_LINE_COMMENT     a comment starts before but extends beyond $max_line_length
3802 # LONG_LINE_STRING      a string starts before but extends beyond $max_line_length
3803 # LONG_LINE             all other lines longer than $max_line_length
3804 #
3805 # if LONG_LINE is ignored, the other 2 types are also ignored
3806 #
3807
3808                 if ($line =~ /^\+/ && $length > $max_line_length) {
3809                         my $msg_type = "LONG_LINE";
3810
3811                         # Check the allowed long line types first
3812
3813                         # logging functions that end in a string that starts
3814                         # before $max_line_length
3815                         if ($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(?:KERN_\S+\s*|[^"]*))?($String\s*(?:|,|\)\s*;)\s*)$/ &&
3816                             length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
3817                                 $msg_type = "";
3818
3819                         # lines with only strings (w/ possible termination)
3820                         # #defines with only strings
3821                         } elsif ($line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ ||
3822                                  $line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) {
3823                                 $msg_type = "";
3824
3825                         # More special cases
3826                         } elsif ($line =~ /^\+.*\bEFI_GUID\s*\(/ ||
3827                                  $line =~ /^\+\s*(?:\w+)?\s*DEFINE_PER_CPU/) {
3828                                 $msg_type = "";
3829
3830                         # URL ($rawline is used in case the URL is in a comment)
3831                         } elsif ($rawline =~ /^\+.*\b[a-z][\w\.\+\-]*:\/\/\S+/i) {
3832                                 $msg_type = "";
3833
3834                         # Otherwise set the alternate message types
3835
3836                         # a comment starts before $max_line_length
3837                         } elsif ($line =~ /($;[\s$;]*)$/ &&
3838                                  length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
3839                                 $msg_type = "LONG_LINE_COMMENT"
3840
3841                         # a quoted string starts before $max_line_length
3842                         } elsif ($sline =~ /\s*($String(?:\s*(?:\\|,\s*|\)\s*;\s*))?)$/ &&
3843                                  length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
3844                                 $msg_type = "LONG_LINE_STRING"
3845                         }
3846
3847                         if ($msg_type ne "" &&
3848                             (show_type("LONG_LINE") || show_type($msg_type))) {
3849                                 my $msg_level = \&WARN;
3850                                 $msg_level = \&CHK if ($file);
3851                                 &{$msg_level}($msg_type,
3852                                               "line length of $length exceeds $max_line_length columns\n" . $herecurr);
3853                         }
3854                 }
3855
3856 # check for adding lines without a newline.
3857                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
3858                         if (WARN("MISSING_EOF_NEWLINE",
3859                                  "adding a line without newline at end of file\n" . $herecurr) &&
3860                             $fix) {
3861                                 fix_delete_line($fixlinenr+1, "No newline at end of file");
3862                         }
3863                 }
3864
3865 # check for .L prefix local symbols in .S files
3866                 if ($realfile =~ /\.S$/ &&
3867                     $line =~ /^\+\s*(?:[A-Z]+_)?SYM_[A-Z]+_(?:START|END)(?:_[A-Z_]+)?\s*\(\s*\.L/) {
3868                         WARN("AVOID_L_PREFIX",
3869                              "Avoid using '.L' prefixed local symbol names for denoting a range of code via 'SYM_*_START/END' annotations; see Documentation/asm-annotations.rst\n" . $herecurr);
3870                 }
3871
3872                 if ($u_boot) {
3873                         u_boot_line($realfile, $line, $rawline, $herecurr);
3874                 }
3875
3876 # check we are in a valid source file C or perl if not then ignore this hunk
3877                 next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);
3878
3879 # at the beginning of a line any tabs must come first and anything
3880 # more than $tabsize must use tabs.
3881                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
3882                     $rawline =~ /^\+\s*        \s*/) {
3883                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3884                         $rpt_cleaners = 1;
3885                         if (ERROR("CODE_INDENT",
3886                                   "code indent should use tabs where possible\n" . $herevet) &&
3887                             $fix) {
3888                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
3889                         }
3890                 }
3891
3892 # check for space before tabs.
3893                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
3894                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
3895                         if (WARN("SPACE_BEFORE_TAB",
3896                                 "please, no space before tabs\n" . $herevet) &&
3897                             $fix) {
3898                                 while ($fixed[$fixlinenr] =~
3899                                            s/(^\+.*) {$tabsize,$tabsize}\t/$1\t\t/) {}
3900                                 while ($fixed[$fixlinenr] =~
3901                                            s/(^\+.*) +\t/$1\t/) {}
3902                         }
3903                 }
3904
3905 # check for assignments on the start of a line
3906                 if ($sline =~ /^\+\s+($Assignment)[^=]/) {
3907                         my $operator = $1;
3908                         if (CHK("ASSIGNMENT_CONTINUATIONS",
3909                                 "Assignment operator '$1' should be on the previous line\n" . $hereprev) &&
3910                             $fix && $prevrawline =~ /^\+/) {
3911                                 # add assignment operator to the previous line, remove from current line
3912                                 $fixed[$fixlinenr - 1] .= " $operator";
3913                                 $fixed[$fixlinenr] =~ s/\Q$operator\E\s*//;
3914                         }
3915                 }
3916
3917 # check for && or || at the start of a line
3918                 if ($rawline =~ /^\+\s*(&&|\|\|)/) {
3919                         my $operator = $1;
3920                         if (CHK("LOGICAL_CONTINUATIONS",
3921                                 "Logical continuations should be on the previous line\n" . $hereprev) &&
3922                             $fix && $prevrawline =~ /^\+/) {
3923                                 # insert logical operator at last non-comment, non-whitepsace char on previous line
3924                                 $prevline =~ /[\s$;]*$/;
3925                                 my $line_end = substr($prevrawline, $-[0]);
3926                                 $fixed[$fixlinenr - 1] =~ s/\Q$line_end\E$/ $operator$line_end/;
3927                                 $fixed[$fixlinenr] =~ s/\Q$operator\E\s*//;
3928                         }
3929                 }
3930
3931 # check indentation starts on a tab stop
3932                 if ($perl_version_ok &&
3933                     $sline =~ /^\+\t+( +)(?:$c90_Keywords\b|\{\s*$|\}\s*(?:else\b|while\b|\s*$)|$Declare\s*$Ident\s*[;=])/) {
3934                         my $indent = length($1);
3935                         if ($indent % $tabsize) {
3936                                 if (WARN("TABSTOP",
3937                                          "Statements should start on a tabstop\n" . $herecurr) &&
3938                                     $fix) {
3939                                         $fixed[$fixlinenr] =~ s@(^\+\t+) +@$1 . "\t" x ($indent/$tabsize)@e;
3940                                 }
3941                         }
3942                 }
3943
3944 # check multi-line statement indentation matches previous line
3945                 if ($perl_version_ok &&
3946                     $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|(?:\*\s*)*$Lval\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) {
3947                         $prevline =~ /^\+(\t*)(.*)$/;
3948                         my $oldindent = $1;
3949                         my $rest = $2;
3950
3951                         my $pos = pos_last_openparen($rest);
3952                         if ($pos >= 0) {
3953                                 $line =~ /^(\+| )([ \t]*)/;
3954                                 my $newindent = $2;
3955
3956                                 my $goodtabindent = $oldindent .
3957                                         "\t" x ($pos / $tabsize) .
3958                                         " "  x ($pos % $tabsize);
3959                                 my $goodspaceindent = $oldindent . " "  x $pos;
3960
3961                                 if ($newindent ne $goodtabindent &&
3962                                     $newindent ne $goodspaceindent) {
3963
3964                                         if (CHK("PARENTHESIS_ALIGNMENT",
3965                                                 "Alignment should match open parenthesis\n" . $hereprev) &&
3966                                             $fix && $line =~ /^\+/) {
3967                                                 $fixed[$fixlinenr] =~
3968                                                     s/^\+[ \t]*/\+$goodtabindent/;
3969                                         }
3970                                 }
3971                         }
3972                 }
3973
3974 # check for space after cast like "(int) foo" or "(struct foo) bar"
3975 # avoid checking a few false positives:
3976 #   "sizeof(<type>)" or "__alignof__(<type>)"
3977 #   function pointer declarations like "(*foo)(int) = bar;"
3978 #   structure definitions like "(struct foo) { 0 };"
3979 #   multiline macros that define functions
3980 #   known attributes or the __attribute__ keyword
3981                 if ($line =~ /^\+(.*)\(\s*$Type\s*\)([ \t]++)((?![={]|\\$|$Attribute|__attribute__))/ &&
3982                     (!defined($1) || $1 !~ /\b(?:sizeof|__alignof__)\s*$/)) {
3983                         if (CHK("SPACING",
3984                                 "No space is necessary after a cast\n" . $herecurr) &&
3985                             $fix) {
3986                                 $fixed[$fixlinenr] =~
3987                                     s/(\(\s*$Type\s*\))[ \t]+/$1/;
3988                         }
3989                 }
3990
3991 # Block comment styles
3992 # Networking with an initial /*
3993                 if ($realfile =~ m@^(drivers/net/|net/)@ &&
3994                     $prevrawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
3995                     $rawline =~ /^\+[ \t]*\*/ &&
3996                     $realline > 3) { # Do not warn about the initial copyright comment block after SPDX-License-Identifier
3997                         WARN("NETWORKING_BLOCK_COMMENT_STYLE",
3998                              "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
3999                 }
4000
4001 # Block comments use * on subsequent lines
4002                 if ($prevline =~ /$;[ \t]*$/ &&                 #ends in comment
4003                     $prevrawline =~ /^\+.*?\/\*/ &&             #starting /*
4004                     $prevrawline !~ /\*\/[ \t]*$/ &&            #no trailing */
4005                     $rawline =~ /^\+/ &&                        #line is new
4006                     $rawline !~ /^\+[ \t]*\*/) {                #no leading *
4007                         WARN("BLOCK_COMMENT_STYLE",
4008                              "Block comments use * on subsequent lines\n" . $hereprev);
4009                 }
4010
4011 # Block comments use */ on trailing lines
4012                 if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
4013                     $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
4014                     $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
4015                     $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
4016                         WARN("BLOCK_COMMENT_STYLE",
4017                              "Block comments use a trailing */ on a separate line\n" . $herecurr);
4018                 }
4019
4020 # Block comment * alignment
4021                 if ($prevline =~ /$;[ \t]*$/ &&                 #ends in comment
4022                     $line =~ /^\+[ \t]*$;/ &&                   #leading comment
4023                     $rawline =~ /^\+[ \t]*\*/ &&                #leading *
4024                     (($prevrawline =~ /^\+.*?\/\*/ &&           #leading /*
4025                       $prevrawline !~ /\*\/[ \t]*$/) ||         #no trailing */
4026                      $prevrawline =~ /^\+[ \t]*\*/)) {          #leading *
4027                         my $oldindent;
4028                         $prevrawline =~ m@^\+([ \t]*/?)\*@;
4029                         if (defined($1)) {
4030                                 $oldindent = expand_tabs($1);
4031                         } else {
4032                                 $prevrawline =~ m@^\+(.*/?)\*@;
4033                                 $oldindent = expand_tabs($1);
4034                         }
4035                         $rawline =~ m@^\+([ \t]*)\*@;
4036                         my $newindent = $1;
4037                         $newindent = expand_tabs($newindent);
4038                         if (length($oldindent) ne length($newindent)) {
4039                                 WARN("BLOCK_COMMENT_STYLE",
4040                                      "Block comments should align the * on each line\n" . $hereprev);
4041                         }
4042                 }
4043
4044 # check for missing blank lines after struct/union declarations
4045 # with exceptions for various attributes and macros
4046                 if ($prevline =~ /^[\+ ]};?\s*$/ &&
4047                     $line =~ /^\+/ &&
4048                     !($line =~ /^\+\s*$/ ||
4049                       $line =~ /^\+\s*EXPORT_SYMBOL/ ||
4050                       $line =~ /^\+\s*MODULE_/i ||
4051                       $line =~ /^\+\s*\#\s*(?:end|elif|else)/ ||
4052                       $line =~ /^\+[a-z_]*init/ ||
4053                       $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ ||
4054                       $line =~ /^\+\s*DECLARE/ ||
4055                       $line =~ /^\+\s*builtin_[\w_]*driver/ ||
4056                       $line =~ /^\+\s*__setup/)) {
4057                         if (CHK("LINE_SPACING",
4058                                 "Please use a blank line after function/struct/union/enum declarations\n" . $hereprev) &&
4059                             $fix) {
4060                                 fix_insert_line($fixlinenr, "\+");
4061                         }
4062                 }
4063
4064 # check for multiple consecutive blank lines
4065                 if ($prevline =~ /^[\+ ]\s*$/ &&
4066                     $line =~ /^\+\s*$/ &&
4067                     $last_blank_line != ($linenr - 1)) {
4068                         if (CHK("LINE_SPACING",
4069                                 "Please don't use multiple blank lines\n" . $hereprev) &&
4070                             $fix) {
4071                                 fix_delete_line($fixlinenr, $rawline);
4072                         }
4073
4074                         $last_blank_line = $linenr;
4075                 }
4076
4077 # check for missing blank lines after declarations
4078 # (declarations must have the same indentation and not be at the start of line)
4079                 if (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/) {
4080                         # use temporaries
4081                         my $sl = $sline;
4082                         my $pl = $prevline;
4083                         # remove $Attribute/$Sparse uses to simplify comparisons
4084                         $sl =~ s/\b(?:$Attribute|$Sparse)\b//g;
4085                         $pl =~ s/\b(?:$Attribute|$Sparse)\b//g;
4086                         if (($pl =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
4087                         # function pointer declarations
4088                              $pl =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
4089                         # foo bar; where foo is some local typedef or #define
4090                              $pl =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
4091                         # known declaration macros
4092                              $pl =~ /^\+\s+$declaration_macros/) &&
4093                         # for "else if" which can look like "$Ident $Ident"
4094                             !($pl =~ /^\+\s+$c90_Keywords\b/ ||
4095                         # other possible extensions of declaration lines
4096                               $pl =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
4097                         # not starting a section or a macro "\" extended line
4098                               $pl =~ /(?:\{\s*|\\)$/) &&
4099                         # looks like a declaration
4100                             !($sl =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
4101                         # function pointer declarations
4102                               $sl =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ ||
4103                         # foo bar; where foo is some local typedef or #define
4104                               $sl =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
4105                         # known declaration macros
4106                               $sl =~ /^\+\s+$declaration_macros/ ||
4107                         # start of struct or union or enum
4108                               $sl =~ /^\+\s+(?:static\s+)?(?:const\s+)?(?:union|struct|enum|typedef)\b/ ||
4109                         # start or end of block or continuation of declaration
4110                               $sl =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
4111                         # bitfield continuation
4112                               $sl =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
4113                         # other possible extensions of declaration lines
4114                               $sl =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/)) {
4115                                 if (WARN("LINE_SPACING",
4116                                          "Missing a blank line after declarations\n" . $hereprev) &&
4117                                     $fix) {
4118                                         fix_insert_line($fixlinenr, "\+");
4119                                 }
4120                         }
4121                 }
4122
4123 # check for spaces at the beginning of a line.
4124 # Exceptions:
4125 #  1) within comments
4126 #  2) indented preprocessor commands
4127 #  3) hanging labels
4128                 if ($rawline =~ /^\+ / && $line !~ /^\+ *(?:$;|#|$Ident:)/)  {
4129                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
4130                         if (WARN("LEADING_SPACE",
4131                                  "please, no spaces at the start of a line\n" . $herevet) &&
4132                             $fix) {
4133                                 $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;
4134                         }
4135                 }
4136
4137 # check we are in a valid C source file if not then ignore this hunk
4138                 next if ($realfile !~ /\.(h|c)$/);
4139
4140 # check for unusual line ending [ or (
4141                 if ($line =~ /^\+.*([\[\(])\s*$/) {
4142                         CHK("OPEN_ENDED_LINE",
4143                             "Lines should not end with a '$1'\n" . $herecurr);
4144                 }
4145
4146 # check if this appears to be the start function declaration, save the name
4147                 if ($sline =~ /^\+\{\s*$/ &&
4148                     $prevline =~ /^\+(?:(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*)?($Ident)\(/) {
4149                         $context_function = $1;
4150                 }
4151
4152 # check if this appears to be the end of function declaration
4153                 if ($sline =~ /^\+\}\s*$/) {
4154                         undef $context_function;
4155                 }
4156
4157 # check indentation of any line with a bare else
4158 # (but not if it is a multiple line "if (foo) return bar; else return baz;")
4159 # if the previous line is a break or return and is indented 1 tab more...
4160                 if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
4161                         my $tabs = length($1) + 1;
4162                         if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ ||
4163                             ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ &&
4164                              defined $lines[$linenr] &&
4165                              $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) {
4166                                 WARN("UNNECESSARY_ELSE",
4167                                      "else is not generally useful after a break or return\n" . $hereprev);
4168                         }
4169                 }
4170
4171 # check indentation of a line with a break;
4172 # if the previous line is a goto, return or break
4173 # and is indented the same # of tabs
4174                 if ($sline =~ /^\+([\t]+)break\s*;\s*$/) {
4175                         my $tabs = $1;
4176                         if ($prevline =~ /^\+$tabs(goto|return|break)\b/) {
4177                                 if (WARN("UNNECESSARY_BREAK",
4178                                          "break is not useful after a $1\n" . $hereprev) &&
4179                                     $fix) {
4180                                         fix_delete_line($fixlinenr, $rawline);
4181                                 }
4182                         }
4183                 }
4184
4185 # check for RCS/CVS revision markers
4186                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
4187                         WARN("CVS_KEYWORD",
4188                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
4189                 }
4190
4191 # check for old HOTPLUG __dev<foo> section markings
4192                 if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
4193                         WARN("HOTPLUG_SECTION",
4194                              "Using $1 is unnecessary\n" . $herecurr);
4195                 }
4196
4197 # Check for potential 'bare' types
4198                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
4199                     $realline_next);
4200 #print "LINE<$line>\n";
4201                 if ($linenr > $suppress_statement &&
4202                     $realcnt && $sline =~ /.\s*\S/) {
4203                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
4204                                 ctx_statement_block($linenr, $realcnt, 0);
4205                         $stat =~ s/\n./\n /g;
4206                         $cond =~ s/\n./\n /g;
4207
4208 #print "linenr<$linenr> <$stat>\n";
4209                         # If this statement has no statement boundaries within
4210                         # it there is no point in retrying a statement scan
4211                         # until we hit end of it.
4212                         my $frag = $stat; $frag =~ s/;+\s*$//;
4213                         if ($frag !~ /(?:{|;)/) {
4214 #print "skip<$line_nr_next>\n";
4215                                 $suppress_statement = $line_nr_next;
4216                         }
4217
4218                         # Find the real next line.
4219                         $realline_next = $line_nr_next;
4220                         if (defined $realline_next &&
4221                             (!defined $lines[$realline_next - 1] ||
4222                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
4223                                 $realline_next++;
4224                         }
4225
4226                         my $s = $stat;
4227                         $s =~ s/{.*$//s;
4228
4229                         # Ignore goto labels.
4230                         if ($s =~ /$Ident:\*$/s) {
4231
4232                         # Ignore functions being called
4233                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
4234
4235                         } elsif ($s =~ /^.\s*else\b/s) {
4236
4237                         # declarations always start with types
4238                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
4239                                 my $type = $1;
4240                                 $type =~ s/\s+/ /g;
4241                                 possible($type, "A:" . $s);
4242
4243                         # definitions in global scope can only start with types
4244                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
4245                                 possible($1, "B:" . $s);
4246                         }
4247
4248                         # any (foo ... *) is a pointer cast, and foo is a type
4249                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
4250                                 possible($1, "C:" . $s);
4251                         }
4252
4253                         # Check for any sort of function declaration.
4254                         # int foo(something bar, other baz);
4255                         # void (*store_gdt)(x86_descr_ptr *);
4256                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
4257                                 my ($name_len) = length($1);
4258
4259                                 my $ctx = $s;
4260                                 substr($ctx, 0, $name_len + 1, '');
4261                                 $ctx =~ s/\)[^\)]*$//;
4262
4263                                 for my $arg (split(/\s*,\s*/, $ctx)) {
4264                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
4265
4266                                                 possible($1, "D:" . $s);
4267                                         }
4268                                 }
4269                         }
4270
4271                 }
4272
4273 #
4274 # Checks which may be anchored in the context.
4275 #
4276
4277 # Check for switch () and associated case and default
4278 # statements should be at the same indent.
4279                 if ($line=~/\bswitch\s*\(.*\)/) {
4280                         my $err = '';
4281                         my $sep = '';
4282                         my @ctx = ctx_block_outer($linenr, $realcnt);
4283                         shift(@ctx);
4284                         for my $ctx (@ctx) {
4285                                 my ($clen, $cindent) = line_stats($ctx);
4286                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
4287                                                         $indent != $cindent) {
4288                                         $err .= "$sep$ctx\n";
4289                                         $sep = '';
4290                                 } else {
4291                                         $sep = "[...]\n";
4292                                 }
4293                         }
4294                         if ($err ne '') {
4295                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
4296                                       "switch and case should be at the same indent\n$hereline$err");
4297                         }
4298                 }
4299
4300 # if/while/etc brace do not go on next line, unless defining a do while loop,
4301 # or if that brace on the next line is for something else
4302                 if ($line =~ /(.*)\b((?:if|while|for|switch|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
4303                         my $pre_ctx = "$1$2";
4304
4305                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
4306
4307                         if ($line =~ /^\+\t{6,}/) {
4308                                 WARN("DEEP_INDENTATION",
4309                                      "Too many leading tabs - consider code refactoring\n" . $herecurr);
4310                         }
4311
4312                         my $ctx_cnt = $realcnt - $#ctx - 1;
4313                         my $ctx = join("\n", @ctx);
4314
4315                         my $ctx_ln = $linenr;
4316                         my $ctx_skip = $realcnt;
4317
4318                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
4319                                         defined $lines[$ctx_ln - 1] &&
4320                                         $lines[$ctx_ln - 1] =~ /^-/)) {
4321                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
4322                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
4323                                 $ctx_ln++;
4324                         }
4325
4326                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
4327                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
4328
4329                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
4330                                 ERROR("OPEN_BRACE",
4331                                       "that open brace { should be on the previous line\n" .
4332                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
4333                         }
4334                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
4335                             $ctx =~ /\)\s*\;\s*$/ &&
4336                             defined $lines[$ctx_ln - 1])
4337                         {
4338                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
4339                                 if ($nindent > $indent) {
4340                                         WARN("TRAILING_SEMICOLON",
4341                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
4342                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
4343                                 }
4344                         }
4345                 }
4346
4347 # Check relative indent for conditionals and blocks.
4348                 if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|(?:do|else)\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
4349                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
4350                                 ctx_statement_block($linenr, $realcnt, 0)
4351                                         if (!defined $stat);
4352                         my ($s, $c) = ($stat, $cond);
4353
4354                         substr($s, 0, length($c), '');
4355
4356                         # remove inline comments
4357                         $s =~ s/$;/ /g;
4358                         $c =~ s/$;/ /g;
4359
4360                         # Find out how long the conditional actually is.
4361                         my @newlines = ($c =~ /\n/gs);
4362                         my $cond_lines = 1 + $#newlines;
4363
4364                         # Make sure we remove the line prefixes as we have
4365                         # none on the first line, and are going to readd them
4366                         # where necessary.
4367                         $s =~ s/\n./\n/gs;
4368                         while ($s =~ /\n\s+\\\n/) {
4369                                 $cond_lines += $s =~ s/\n\s+\\\n/\n/g;
4370                         }
4371
4372                         # We want to check the first line inside the block
4373                         # starting at the end of the conditional, so remove:
4374                         #  1) any blank line termination
4375                         #  2) any opening brace { on end of the line
4376                         #  3) any do (...) {
4377                         my $continuation = 0;
4378                         my $check = 0;
4379                         $s =~ s/^.*\bdo\b//;
4380                         $s =~ s/^\s*{//;
4381                         if ($s =~ s/^\s*\\//) {
4382                                 $continuation = 1;
4383                         }
4384                         if ($s =~ s/^\s*?\n//) {
4385                                 $check = 1;
4386                                 $cond_lines++;
4387                         }
4388
4389                         # Also ignore a loop construct at the end of a
4390                         # preprocessor statement.
4391                         if (($prevline =~ /^.\s*#\s*define\s/ ||
4392                             $prevline =~ /\\\s*$/) && $continuation == 0) {
4393                                 $check = 0;
4394                         }
4395
4396                         my $cond_ptr = -1;
4397                         $continuation = 0;
4398                         while ($cond_ptr != $cond_lines) {
4399                                 $cond_ptr = $cond_lines;
4400
4401                                 # If we see an #else/#elif then the code
4402                                 # is not linear.
4403                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
4404                                         $check = 0;
4405                                 }
4406
4407                                 # Ignore:
4408                                 #  1) blank lines, they should be at 0,
4409                                 #  2) preprocessor lines, and
4410                                 #  3) labels.
4411                                 if ($continuation ||
4412                                     $s =~ /^\s*?\n/ ||
4413                                     $s =~ /^\s*#\s*?/ ||
4414                                     $s =~ /^\s*$Ident\s*:/) {
4415                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
4416                                         if ($s =~ s/^.*?\n//) {
4417                                                 $cond_lines++;
4418                                         }
4419                                 }
4420                         }
4421
4422                         my (undef, $sindent) = line_stats("+" . $s);
4423                         my $stat_real = raw_line($linenr, $cond_lines);
4424
4425                         # Check if either of these lines are modified, else
4426                         # this is not this patch's fault.
4427                         if (!defined($stat_real) ||
4428                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
4429                                 $check = 0;
4430                         }
4431                         if (defined($stat_real) && $cond_lines > 1) {
4432                                 $stat_real = "[...]\n$stat_real";
4433                         }
4434
4435                         #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
4436
4437                         if ($check && $s ne '' &&
4438                             (($sindent % $tabsize) != 0 ||
4439                              ($sindent < $indent) ||
4440                              ($sindent == $indent &&
4441                               ($s !~ /^\s*(?:\}|\{|else\b)/)) ||
4442                              ($sindent > $indent + $tabsize))) {
4443                                 WARN("SUSPECT_CODE_INDENT",
4444                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
4445                         }
4446                 }
4447
4448                 # Track the 'values' across context and added lines.
4449                 my $opline = $line; $opline =~ s/^./ /;
4450                 my ($curr_values, $curr_vars) =
4451                                 annotate_values($opline . "\n", $prev_values);
4452                 $curr_values = $prev_values . $curr_values;
4453                 if ($dbg_values) {
4454                         my $outline = $opline; $outline =~ s/\t/ /g;
4455                         print "$linenr > .$outline\n";
4456                         print "$linenr > $curr_values\n";
4457                         print "$linenr >  $curr_vars\n";
4458                 }
4459                 $prev_values = substr($curr_values, -1);
4460
4461 #ignore lines not being added
4462                 next if ($line =~ /^[^\+]/);
4463
4464 # check for self assignments used to avoid compiler warnings
4465 # e.g.: int foo = foo, *bar = NULL;
4466 #       struct foo bar = *(&(bar));
4467                 if ($line =~ /^\+\s*(?:$Declare)?([A-Za-z_][A-Za-z\d_]*)\s*=/) {
4468                         my $var = $1;
4469                         if ($line =~ /^\+\s*(?:$Declare)?$var\s*=\s*(?:$var|\*\s*\(?\s*&\s*\(?\s*$var\s*\)?\s*\)?)\s*[;,]/) {
4470                                 WARN("SELF_ASSIGNMENT",
4471                                      "Do not use self-assignments to avoid compiler warnings\n" . $herecurr);
4472                         }
4473                 }
4474
4475 # check for dereferences that span multiple lines
4476                 if ($prevline =~ /^\+.*$Lval\s*(?:\.|->)\s*$/ &&
4477                     $line =~ /^\+\s*(?!\#\s*(?!define\s+|if))\s*$Lval/) {
4478                         $prevline =~ /($Lval\s*(?:\.|->))\s*$/;
4479                         my $ref = $1;
4480                         $line =~ /^.\s*($Lval)/;
4481                         $ref .= $1;
4482                         $ref =~ s/\s//g;
4483                         WARN("MULTILINE_DEREFERENCE",
4484                              "Avoid multiple line dereference - prefer '$ref'\n" . $hereprev);
4485                 }
4486
4487 # check for declarations of signed or unsigned without int
4488                 while ($line =~ m{\b($Declare)\s*(?!char\b|short\b|int\b|long\b)\s*($Ident)?\s*[=,;\[\)\(]}g) {
4489                         my $type = $1;
4490                         my $var = $2;
4491                         $var = "" if (!defined $var);
4492                         if ($type =~ /^(?:(?:$Storage|$Inline|$Attribute)\s+)*((?:un)?signed)((?:\s*\*)*)\s*$/) {
4493                                 my $sign = $1;
4494                                 my $pointer = $2;
4495
4496                                 $pointer = "" if (!defined $pointer);
4497
4498                                 if (WARN("UNSPECIFIED_INT",
4499                                          "Prefer '" . trim($sign) . " int" . rtrim($pointer) . "' to bare use of '$sign" . rtrim($pointer) . "'\n" . $herecurr) &&
4500                                     $fix) {
4501                                         my $decl = trim($sign) . " int ";
4502                                         my $comp_pointer = $pointer;
4503                                         $comp_pointer =~ s/\s//g;
4504                                         $decl .= $comp_pointer;
4505                                         $decl = rtrim($decl) if ($var eq "");
4506                                         $fixed[$fixlinenr] =~ s@\b$sign\s*\Q$pointer\E\s*$var\b@$decl$var@;
4507                                 }
4508                         }
4509                 }
4510
4511 # TEST: allow direct testing of the type matcher.
4512                 if ($dbg_type) {
4513                         if ($line =~ /^.\s*$Declare\s*$/) {
4514                                 ERROR("TEST_TYPE",
4515                                       "TEST: is type\n" . $herecurr);
4516                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
4517                                 ERROR("TEST_NOT_TYPE",
4518                                       "TEST: is not type ($1 is)\n". $herecurr);
4519                         }
4520                         next;
4521                 }
4522 # TEST: allow direct testing of the attribute matcher.
4523                 if ($dbg_attr) {
4524                         if ($line =~ /^.\s*$Modifier\s*$/) {
4525                                 ERROR("TEST_ATTR",
4526                                       "TEST: is attr\n" . $herecurr);
4527                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
4528                                 ERROR("TEST_NOT_ATTR",
4529                                       "TEST: is not attr ($1 is)\n". $herecurr);
4530                         }
4531                         next;
4532                 }
4533
4534 # check for initialisation to aggregates open brace on the next line
4535                 if ($line =~ /^.\s*{/ &&
4536                     $prevline =~ /(?:^|[^=])=\s*$/) {
4537                         if (ERROR("OPEN_BRACE",
4538                                   "that open brace { should be on the previous line\n" . $hereprev) &&
4539                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4540                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4541                                 fix_delete_line($fixlinenr, $rawline);
4542                                 my $fixedline = $prevrawline;
4543                                 $fixedline =~ s/\s*=\s*$/ = {/;
4544                                 fix_insert_line($fixlinenr, $fixedline);
4545                                 $fixedline = $line;
4546                                 $fixedline =~ s/^(.\s*)\{\s*/$1/;
4547                                 fix_insert_line($fixlinenr, $fixedline);
4548                         }
4549                 }
4550
4551 #
4552 # Checks which are anchored on the added line.
4553 #
4554
4555 # check for malformed paths in #include statements (uses RAW line)
4556                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
4557                         my $path = $1;
4558                         if ($path =~ m{//}) {
4559                                 ERROR("MALFORMED_INCLUDE",
4560                                       "malformed #include filename\n" . $herecurr);
4561                         }
4562                         if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
4563                                 ERROR("UAPI_INCLUDE",
4564                                       "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
4565                         }
4566                 }
4567
4568 # no C99 // comments
4569                 if ($line =~ m{//}) {
4570                         if (ERROR("C99_COMMENTS",
4571                                   "do not use C99 // comments\n" . $herecurr) &&
4572                             $fix) {
4573                                 my $line = $fixed[$fixlinenr];
4574                                 if ($line =~ /\/\/(.*)$/) {
4575                                         my $comment = trim($1);
4576                                         $fixed[$fixlinenr] =~ s@\/\/(.*)$@/\* $comment \*/@;
4577                                 }
4578                         }
4579                 }
4580                 # Remove C99 comments.
4581                 $line =~ s@//.*@@;
4582                 $opline =~ s@//.*@@;
4583
4584 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
4585 # the whole statement.
4586 #print "APW <$lines[$realline_next - 1]>\n";
4587                 if (defined $realline_next &&
4588                     exists $lines[$realline_next - 1] &&
4589                     !defined $suppress_export{$realline_next} &&
4590                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/)) {
4591                         # Handle definitions which produce identifiers with
4592                         # a prefix:
4593                         #   XXX(foo);
4594                         #   EXPORT_SYMBOL(something_foo);
4595                         my $name = $1;
4596                         $name =~ s/^\s*($Ident).*/$1/;
4597                         if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
4598                             $name =~ /^${Ident}_$2/) {
4599 #print "FOO C name<$name>\n";
4600                                 $suppress_export{$realline_next} = 1;
4601
4602                         } elsif ($stat !~ /(?:
4603                                 \n.}\s*$|
4604                                 ^.DEFINE_$Ident\(\Q$name\E\)|
4605                                 ^.DECLARE_$Ident\(\Q$name\E\)|
4606                                 ^.LIST_HEAD\(\Q$name\E\)|
4607                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
4608                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
4609                             )/x) {
4610 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
4611                                 $suppress_export{$realline_next} = 2;
4612                         } else {
4613                                 $suppress_export{$realline_next} = 1;
4614                         }
4615                 }
4616                 if (!defined $suppress_export{$linenr} &&
4617                     $prevline =~ /^.\s*$/ &&
4618                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/)) {
4619 #print "FOO B <$lines[$linenr - 1]>\n";
4620                         $suppress_export{$linenr} = 2;
4621                 }
4622                 if (defined $suppress_export{$linenr} &&
4623                     $suppress_export{$linenr} == 2) {
4624                         WARN("EXPORT_SYMBOL",
4625                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
4626                 }
4627
4628 # check for global initialisers.
4629                 if ($line =~ /^\+$Type\s*$Ident(?:\s+$Modifier)*\s*=\s*($zero_initializer)\s*;/ &&
4630                     !exclude_global_initialisers($realfile)) {
4631                         if (ERROR("GLOBAL_INITIALISERS",
4632                                   "do not initialise globals to $1\n" . $herecurr) &&
4633                             $fix) {
4634                                 $fixed[$fixlinenr] =~ s/(^.$Type\s*$Ident(?:\s+$Modifier)*)\s*=\s*$zero_initializer\s*;/$1;/;
4635                         }
4636                 }
4637 # check for static initialisers.
4638                 if ($line =~ /^\+.*\bstatic\s.*=\s*($zero_initializer)\s*;/) {
4639                         if (ERROR("INITIALISED_STATIC",
4640                                   "do not initialise statics to $1\n" .
4641                                       $herecurr) &&
4642                             $fix) {
4643                                 $fixed[$fixlinenr] =~ s/(\bstatic\s.*?)\s*=\s*$zero_initializer\s*;/$1;/;
4644                         }
4645                 }
4646
4647 # check for misordered declarations of char/short/int/long with signed/unsigned
4648                 while ($sline =~ m{(\b$TypeMisordered\b)}g) {
4649                         my $tmp = trim($1);
4650                         WARN("MISORDERED_TYPE",
4651                              "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order\n" . $herecurr);
4652                 }
4653
4654 # check for unnecessary <signed> int declarations of short/long/long long
4655                 while ($sline =~ m{\b($TypeMisordered(\s*\*)*|$C90_int_types)\b}g) {
4656                         my $type = trim($1);
4657                         next if ($type !~ /\bint\b/);
4658                         next if ($type !~ /\b(?:short|long\s+long|long)\b/);
4659                         my $new_type = $type;
4660                         $new_type =~ s/\b\s*int\s*\b/ /;
4661                         $new_type =~ s/\b\s*(?:un)?signed\b\s*/ /;
4662                         $new_type =~ s/^const\s+//;
4663                         $new_type = "unsigned $new_type" if ($type =~ /\bunsigned\b/);
4664                         $new_type = "const $new_type" if ($type =~ /^const\b/);
4665                         $new_type =~ s/\s+/ /g;
4666                         $new_type = trim($new_type);
4667                         if (WARN("UNNECESSARY_INT",
4668                                  "Prefer '$new_type' over '$type' as the int is unnecessary\n" . $herecurr) &&
4669                             $fix) {
4670                                 $fixed[$fixlinenr] =~ s/\b\Q$type\E\b/$new_type/;
4671                         }
4672                 }
4673
4674 # check for static const char * arrays.
4675                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
4676                         WARN("STATIC_CONST_CHAR_ARRAY",
4677                              "static const char * array should probably be static const char * const\n" .
4678                                 $herecurr);
4679                 }
4680
4681 # check for initialized const char arrays that should be static const
4682                 if ($line =~ /^\+\s*const\s+(char|unsigned\s+char|_*u8|(?:[us]_)?int8_t)\s+\w+\s*\[\s*(?:\w+\s*)?\]\s*=\s*"/) {
4683                         if (WARN("STATIC_CONST_CHAR_ARRAY",
4684                                  "const array should probably be static const\n" . $herecurr) &&
4685                             $fix) {
4686                                 $fixed[$fixlinenr] =~ s/(^.\s*)const\b/${1}static const/;
4687                         }
4688                 }
4689
4690 # check for static char foo[] = "bar" declarations.
4691                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
4692                         WARN("STATIC_CONST_CHAR_ARRAY",
4693                              "static char array declaration should probably be static const char\n" .
4694                                 $herecurr);
4695                 }
4696
4697 # check for const <foo> const where <foo> is not a pointer or array type
4698                 if ($sline =~ /\bconst\s+($BasicType)\s+const\b/) {
4699                         my $found = $1;
4700                         if ($sline =~ /\bconst\s+\Q$found\E\s+const\b\s*\*/) {
4701                                 WARN("CONST_CONST",
4702                                      "'const $found const *' should probably be 'const $found * const'\n" . $herecurr);
4703                         } elsif ($sline !~ /\bconst\s+\Q$found\E\s+const\s+\w+\s*\[/) {
4704                                 WARN("CONST_CONST",
4705                                      "'const $found const' should probably be 'const $found'\n" . $herecurr);
4706                         }
4707                 }
4708
4709 # check for const static or static <non ptr type> const declarations
4710 # prefer 'static const <foo>' over 'const static <foo>' and 'static <foo> const'
4711                 if ($sline =~ /^\+\s*const\s+static\s+($Type)\b/ ||
4712                     $sline =~ /^\+\s*static\s+($BasicType)\s+const\b/) {
4713                         if (WARN("STATIC_CONST",
4714                                  "Move const after static - use 'static const $1'\n" . $herecurr) &&
4715                             $fix) {
4716                                 $fixed[$fixlinenr] =~ s/\bconst\s+static\b/static const/;
4717                                 $fixed[$fixlinenr] =~ s/\bstatic\s+($BasicType)\s+const\b/static const $1/;
4718                         }
4719                 }
4720
4721 # check for non-global char *foo[] = {"bar", ...} declarations.
4722                 if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
4723                         WARN("STATIC_CONST_CHAR_ARRAY",
4724                              "char * array declaration might be better as static const\n" .
4725                                 $herecurr);
4726                 }
4727
4728 # check for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo)
4729                 if ($line =~ m@\bsizeof\s*\(\s*($Lval)\s*\)@) {
4730                         my $array = $1;
4731                         if ($line =~ m@\b(sizeof\s*\(\s*\Q$array\E\s*\)\s*/\s*sizeof\s*\(\s*\Q$array\E\s*\[\s*0\s*\]\s*\))@) {
4732                                 my $array_div = $1;
4733                                 if (WARN("ARRAY_SIZE",
4734                                          "Prefer ARRAY_SIZE($array)\n" . $herecurr) &&
4735                                     $fix) {
4736                                         $fixed[$fixlinenr] =~ s/\Q$array_div\E/ARRAY_SIZE($array)/;
4737                                 }
4738                         }
4739                 }
4740
4741 # check for function declarations without arguments like "int foo()"
4742                 if ($line =~ /(\b$Type\s*$Ident)\s*\(\s*\)/) {
4743                         if (ERROR("FUNCTION_WITHOUT_ARGS",
4744                                   "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) &&
4745                             $fix) {
4746                                 $fixed[$fixlinenr] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/;
4747                         }
4748                 }
4749
4750 # check for new typedefs, only function parameters and sparse annotations
4751 # make sense.
4752                 if ($line =~ /\btypedef\s/ &&
4753                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
4754                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
4755                     $line !~ /\b$typeTypedefs\b/ &&
4756                     $line !~ /\b__bitwise\b/) {
4757                         WARN("NEW_TYPEDEFS",
4758                              "do not add new typedefs\n" . $herecurr);
4759                 }
4760
4761 # * goes on variable not on type
4762                 # (char*[ const])
4763                 while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
4764                         #print "AA<$1>\n";
4765                         my ($ident, $from, $to) = ($1, $2, $2);
4766
4767                         # Should start with a space.
4768                         $to =~ s/^(\S)/ $1/;
4769                         # Should not end with a space.
4770                         $to =~ s/\s+$//;
4771                         # '*'s should not have spaces between.
4772                         while ($to =~ s/\*\s+\*/\*\*/) {
4773                         }
4774
4775 ##                      print "1: from<$from> to<$to> ident<$ident>\n";
4776                         if ($from ne $to) {
4777                                 if (ERROR("POINTER_LOCATION",
4778                                           "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr) &&
4779                                     $fix) {
4780                                         my $sub_from = $ident;
4781                                         my $sub_to = $ident;
4782                                         $sub_to =~ s/\Q$from\E/$to/;
4783                                         $fixed[$fixlinenr] =~
4784                                             s@\Q$sub_from\E@$sub_to@;
4785                                 }
4786                         }
4787                 }
4788                 while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
4789                         #print "BB<$1>\n";
4790                         my ($match, $from, $to, $ident) = ($1, $2, $2, $3);
4791
4792                         # Should start with a space.
4793                         $to =~ s/^(\S)/ $1/;
4794                         # Should not end with a space.
4795                         $to =~ s/\s+$//;
4796                         # '*'s should not have spaces between.
4797                         while ($to =~ s/\*\s+\*/\*\*/) {
4798                         }
4799                         # Modifiers should have spaces.
4800                         $to =~ s/(\b$Modifier$)/$1 /;
4801
4802 ##                      print "2: from<$from> to<$to> ident<$ident>\n";
4803                         if ($from ne $to && $ident !~ /^$Modifier$/) {
4804                                 if (ERROR("POINTER_LOCATION",
4805                                           "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr) &&
4806                                     $fix) {
4807
4808                                         my $sub_from = $match;
4809                                         my $sub_to = $match;
4810                                         $sub_to =~ s/\Q$from\E/$to/;
4811                                         $fixed[$fixlinenr] =~
4812                                             s@\Q$sub_from\E@$sub_to@;
4813                                 }
4814                         }
4815                 }
4816
4817 # avoid BUG() or BUG_ON()
4818                 if ($line =~ /\b(?:BUG|BUG_ON)\b/) {
4819                         my $msg_level = \&WARN;
4820                         $msg_level = \&CHK if ($file);
4821                         &{$msg_level}("AVOID_BUG",
4822                                       "Avoid crashing the kernel - try using WARN_ON & recovery code rather than BUG() or BUG_ON()\n" . $herecurr);
4823                 }
4824
4825 # avoid LINUX_VERSION_CODE
4826                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
4827                         WARN("LINUX_VERSION_CODE",
4828                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
4829                 }
4830
4831 # check for uses of printk_ratelimit
4832                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
4833                         WARN("PRINTK_RATELIMITED",
4834                              "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
4835                 }
4836
4837 # printk should use KERN_* levels
4838                 if ($line =~ /\bprintk\s*\(\s*(?!KERN_[A-Z]+\b)/) {
4839                         WARN("PRINTK_WITHOUT_KERN_LEVEL",
4840                              "printk() should include KERN_<LEVEL> facility level\n" . $herecurr);
4841                 }
4842
4843 # prefer variants of (subsystem|netdev|dev|pr)_<level> to printk(KERN_<LEVEL>
4844                 if ($line =~ /\b(printk(_once|_ratelimited)?)\s*\(\s*KERN_([A-Z]+)/) {
4845                         my $printk = $1;
4846                         my $modifier = $2;
4847                         my $orig = $3;
4848                         $modifier = "" if (!defined($modifier));
4849                         my $level = lc($orig);
4850                         $level = "warn" if ($level eq "warning");
4851                         my $level2 = $level;
4852                         $level2 = "dbg" if ($level eq "debug");
4853                         $level .= $modifier;
4854                         $level2 .= $modifier;
4855                         WARN("PREFER_PR_LEVEL",
4856                              "Prefer [subsystem eg: netdev]_$level2([subsystem]dev, ... then dev_$level2(dev, ... then pr_$level(...  to $printk(KERN_$orig ...\n" . $herecurr);
4857                 }
4858
4859 # prefer dev_<level> to dev_printk(KERN_<LEVEL>
4860                 if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
4861                         my $orig = $1;
4862                         my $level = lc($orig);
4863                         $level = "warn" if ($level eq "warning");
4864                         $level = "dbg" if ($level eq "debug");
4865                         WARN("PREFER_DEV_LEVEL",
4866                              "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
4867                 }
4868
4869 # trace_printk should not be used in production code.
4870                 if ($line =~ /\b(trace_printk|trace_puts|ftrace_vprintk)\s*\(/) {
4871                         WARN("TRACE_PRINTK",
4872                              "Do not use $1() in production code (this can be ignored if built only with a debug config option)\n" . $herecurr);
4873                 }
4874
4875 # ENOSYS means "bad syscall nr" and nothing else.  This will have a small
4876 # number of false positives, but assembly files are not checked, so at
4877 # least the arch entry code will not trigger this warning.
4878                 if ($line =~ /\bENOSYS\b/) {
4879                         WARN("ENOSYS",
4880                              "ENOSYS means 'invalid syscall nr' and nothing else\n" . $herecurr);
4881                 }
4882
4883 # ENOTSUPP is not a standard error code and should be avoided in new patches.
4884 # Folks usually mean EOPNOTSUPP (also called ENOTSUP), when they type ENOTSUPP.
4885 # Similarly to ENOSYS warning a small number of false positives is expected.
4886                 if (!$file && $line =~ /\bENOTSUPP\b/) {
4887                         if (WARN("ENOTSUPP",
4888                                  "ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP\n" . $herecurr) &&
4889                             $fix) {
4890                                 $fixed[$fixlinenr] =~ s/\bENOTSUPP\b/EOPNOTSUPP/;
4891                         }
4892                 }
4893
4894 # function brace can't be on same line, except for #defines of do while,
4895 # or if closed on same line
4896                 if ($perl_version_ok &&
4897                     $sline =~ /$Type\s*$Ident\s*$balanced_parens\s*\{/ &&
4898                     $sline !~ /\#\s*define\b.*do\s*\{/ &&
4899                     $sline !~ /}/) {
4900                         if (ERROR("OPEN_BRACE",
4901                                   "open brace '{' following function definitions go on the next line\n" . $herecurr) &&
4902                             $fix) {
4903                                 fix_delete_line($fixlinenr, $rawline);
4904                                 my $fixed_line = $rawline;
4905                                 $fixed_line =~ /(^..*$Type\s*$Ident\(.*\)\s*)\{(.*)$/;
4906                                 my $line1 = $1;
4907                                 my $line2 = $2;
4908                                 fix_insert_line($fixlinenr, ltrim($line1));
4909                                 fix_insert_line($fixlinenr, "\+{");
4910                                 if ($line2 !~ /^\s*$/) {
4911                                         fix_insert_line($fixlinenr, "\+\t" . trim($line2));
4912                                 }
4913                         }
4914                 }
4915
4916 # open braces for enum, union and struct go on the same line.
4917                 if ($line =~ /^.\s*{/ &&
4918                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
4919                         if (ERROR("OPEN_BRACE",
4920                                   "open brace '{' following $1 go on the same line\n" . $hereprev) &&
4921                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
4922                                 fix_delete_line($fixlinenr - 1, $prevrawline);
4923                                 fix_delete_line($fixlinenr, $rawline);
4924                                 my $fixedline = rtrim($prevrawline) . " {";
4925                                 fix_insert_line($fixlinenr, $fixedline);
4926                                 $fixedline = $rawline;
4927                                 $fixedline =~ s/^(.\s*)\{\s*/$1\t/;
4928                                 if ($fixedline !~ /^\+\s*$/) {
4929                                         fix_insert_line($fixlinenr, $fixedline);
4930                                 }
4931                         }
4932                 }
4933
4934 # missing space after union, struct or enum definition
4935                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident){1,2}[=\{]/) {
4936                         if (WARN("SPACING",
4937                                  "missing space after $1 definition\n" . $herecurr) &&
4938                             $fix) {
4939                                 $fixed[$fixlinenr] =~
4940                                     s/^(.\s*(?:typedef\s+)?(?:enum|union|struct)(?:\s+$Ident){1,2})([=\{])/$1 $2/;
4941                         }
4942                 }
4943
4944 # Function pointer declarations
4945 # check spacing between type, funcptr, and args
4946 # canonical declaration is "type (*funcptr)(args...)"
4947                 if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)($Ident)(\s*)\)(\s*)\(/) {
4948                         my $declare = $1;
4949                         my $pre_pointer_space = $2;
4950                         my $post_pointer_space = $3;
4951                         my $funcname = $4;
4952                         my $post_funcname_space = $5;
4953                         my $pre_args_space = $6;
4954
4955 # the $Declare variable will capture all spaces after the type
4956 # so check it for a missing trailing missing space but pointer return types
4957 # don't need a space so don't warn for those.
4958                         my $post_declare_space = "";
4959                         if ($declare =~ /(\s+)$/) {
4960                                 $post_declare_space = $1;
4961                                 $declare = rtrim($declare);
4962                         }
4963                         if ($declare !~ /\*$/ && $post_declare_space =~ /^$/) {
4964                                 WARN("SPACING",
4965                                      "missing space after return type\n" . $herecurr);
4966                                 $post_declare_space = " ";
4967                         }
4968
4969 # unnecessary space "type  (*funcptr)(args...)"
4970 # This test is not currently implemented because these declarations are
4971 # equivalent to
4972 #       int  foo(int bar, ...)
4973 # and this is form shouldn't/doesn't generate a checkpatch warning.
4974 #
4975 #                       elsif ($declare =~ /\s{2,}$/) {
4976 #                               WARN("SPACING",
4977 #                                    "Multiple spaces after return type\n" . $herecurr);
4978 #                       }
4979
4980 # unnecessary space "type ( *funcptr)(args...)"
4981                         if (defined $pre_pointer_space &&
4982                             $pre_pointer_space =~ /^\s/) {
4983                                 WARN("SPACING",
4984                                      "Unnecessary space after function pointer open parenthesis\n" . $herecurr);
4985                         }
4986
4987 # unnecessary space "type (* funcptr)(args...)"
4988                         if (defined $post_pointer_space &&
4989                             $post_pointer_space =~ /^\s/) {
4990                                 WARN("SPACING",
4991                                      "Unnecessary space before function pointer name\n" . $herecurr);
4992                         }
4993
4994 # unnecessary space "type (*funcptr )(args...)"
4995                         if (defined $post_funcname_space &&
4996                             $post_funcname_space =~ /^\s/) {
4997                                 WARN("SPACING",
4998                                      "Unnecessary space after function pointer name\n" . $herecurr);
4999                         }
5000
5001 # unnecessary space "type (*funcptr) (args...)"
5002                         if (defined $pre_args_space &&
5003                             $pre_args_space =~ /^\s/) {
5004                                 WARN("SPACING",
5005                                      "Unnecessary space before function pointer arguments\n" . $herecurr);
5006                         }
5007
5008                         if (show_type("SPACING") && $fix) {
5009                                 $fixed[$fixlinenr] =~
5010                                     s/^(.\s*)$Declare\s*\(\s*\*\s*$Ident\s*\)\s*\(/$1 . $declare . $post_declare_space . '(*' . $funcname . ')('/ex;
5011                         }
5012                 }
5013
5014 # check for spacing round square brackets; allowed:
5015 #  1. with a type on the left -- int [] a;
5016 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
5017 #  3. inside a curly brace -- = { [0...10] = 5 }
5018                 while ($line =~ /(.*?\s)\[/g) {
5019                         my ($where, $prefix) = ($-[1], $1);
5020                         if ($prefix !~ /$Type\s+$/ &&
5021                             ($where != 0 || $prefix !~ /^.\s+$/) &&
5022                             $prefix !~ /[{,:]\s+$/) {
5023                                 if (ERROR("BRACKET_SPACE",
5024                                           "space prohibited before open square bracket '['\n" . $herecurr) &&
5025                                     $fix) {
5026                                     $fixed[$fixlinenr] =~
5027                                         s/^(\+.*?)\s+\[/$1\[/;
5028                                 }
5029                         }
5030                 }
5031
5032 # check for spaces between functions and their parentheses.
5033                 while ($line =~ /($Ident)\s+\(/g) {
5034                         my $name = $1;
5035                         my $ctx_before = substr($line, 0, $-[1]);
5036                         my $ctx = "$ctx_before$name";
5037
5038                         # Ignore those directives where spaces _are_ permitted.
5039                         if ($name =~ /^(?:
5040                                 if|for|while|switch|return|case|
5041                                 volatile|__volatile__|
5042                                 __attribute__|format|__extension__|
5043                                 asm|__asm__)$/x)
5044                         {
5045                         # cpp #define statements have non-optional spaces, ie
5046                         # if there is a space between the name and the open
5047                         # parenthesis it is simply not a parameter group.
5048                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
5049
5050                         # cpp #elif statement condition may start with a (
5051                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
5052
5053                         # If this whole things ends with a type its most
5054                         # likely a typedef for a function.
5055                         } elsif ($ctx =~ /$Type$/) {
5056
5057                         } else {
5058                                 if (WARN("SPACING",
5059                                          "space prohibited between function name and open parenthesis '('\n" . $herecurr) &&
5060                                              $fix) {
5061                                         $fixed[$fixlinenr] =~
5062                                             s/\b$name\s+\(/$name\(/;
5063                                 }
5064                         }
5065                 }
5066
5067 # Check operator spacing.
5068                 if (!($line=~/\#\s*include/)) {
5069                         my $fixed_line = "";
5070                         my $line_fixed = 0;
5071
5072                         my $ops = qr{
5073                                 <<=|>>=|<=|>=|==|!=|
5074                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
5075                                 =>|->|<<|>>|<|>|=|!|~|
5076                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
5077                                 \?:|\?|:
5078                         }x;
5079                         my @elements = split(/($ops|;)/, $opline);
5080
5081 ##                      print("element count: <" . $#elements . ">\n");
5082 ##                      foreach my $el (@elements) {
5083 ##                              print("el: <$el>\n");
5084 ##                      }
5085
5086                         my @fix_elements = ();
5087                         my $off = 0;
5088
5089                         foreach my $el (@elements) {
5090                                 push(@fix_elements, substr($rawline, $off, length($el)));
5091                                 $off += length($el);
5092                         }
5093
5094                         $off = 0;
5095
5096                         my $blank = copy_spacing($opline);
5097                         my $last_after = -1;
5098
5099                         for (my $n = 0; $n < $#elements; $n += 2) {
5100
5101                                 my $good = $fix_elements[$n] . $fix_elements[$n + 1];
5102
5103 ##                              print("n: <$n> good: <$good>\n");
5104
5105                                 $off += length($elements[$n]);
5106
5107                                 # Pick up the preceding and succeeding characters.
5108                                 my $ca = substr($opline, 0, $off);
5109                                 my $cc = '';
5110                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
5111                                         $cc = substr($opline, $off + length($elements[$n + 1]));
5112                                 }
5113                                 my $cb = "$ca$;$cc";
5114
5115                                 my $a = '';
5116                                 $a = 'V' if ($elements[$n] ne '');
5117                                 $a = 'W' if ($elements[$n] =~ /\s$/);
5118                                 $a = 'C' if ($elements[$n] =~ /$;$/);
5119                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
5120                                 $a = 'O' if ($elements[$n] eq '');
5121                                 $a = 'E' if ($ca =~ /^\s*$/);
5122
5123                                 my $op = $elements[$n + 1];
5124
5125                                 my $c = '';
5126                                 if (defined $elements[$n + 2]) {
5127                                         $c = 'V' if ($elements[$n + 2] ne '');
5128                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
5129                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
5130                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
5131                                         $c = 'O' if ($elements[$n + 2] eq '');
5132                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
5133                                 } else {
5134                                         $c = 'E';
5135                                 }
5136
5137                                 my $ctx = "${a}x${c}";
5138
5139                                 my $at = "(ctx:$ctx)";
5140
5141                                 my $ptr = substr($blank, 0, $off) . "^";
5142                                 my $hereptr = "$hereline$ptr\n";
5143
5144                                 # Pull out the value of this operator.
5145                                 my $op_type = substr($curr_values, $off + 1, 1);
5146
5147                                 # Get the full operator variant.
5148                                 my $opv = $op . substr($curr_vars, $off, 1);
5149
5150                                 # Ignore operators passed as parameters.
5151                                 if ($op_type ne 'V' &&
5152                                     $ca =~ /\s$/ && $cc =~ /^\s*[,\)]/) {
5153
5154 #                               # Ignore comments
5155 #                               } elsif ($op =~ /^$;+$/) {
5156
5157                                 # ; should have either the end of line or a space or \ after it
5158                                 } elsif ($op eq ';') {
5159                                         if ($ctx !~ /.x[WEBC]/ &&
5160                                             $cc !~ /^\\/ && $cc !~ /^;/) {
5161                                                 if (ERROR("SPACING",
5162                                                           "space required after that '$op' $at\n" . $hereptr)) {
5163                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
5164                                                         $line_fixed = 1;
5165                                                 }
5166                                         }
5167
5168                                 # // is a comment
5169                                 } elsif ($op eq '//') {
5170
5171                                 #   :   when part of a bitfield
5172                                 } elsif ($opv eq ':B') {
5173                                         # skip the bitfield test for now
5174
5175                                 # No spaces for:
5176                                 #   ->
5177                                 } elsif ($op eq '->') {
5178                                         if ($ctx =~ /Wx.|.xW/) {
5179                                                 if (ERROR("SPACING",
5180                                                           "spaces prohibited around that '$op' $at\n" . $hereptr)) {
5181                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
5182                                                         if (defined $fix_elements[$n + 2]) {
5183                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
5184                                                         }
5185                                                         $line_fixed = 1;
5186                                                 }
5187                                         }
5188
5189                                 # , must not have a space before and must have a space on the right.
5190                                 } elsif ($op eq ',') {
5191                                         my $rtrim_before = 0;
5192                                         my $space_after = 0;
5193                                         if ($ctx =~ /Wx./) {
5194                                                 if (ERROR("SPACING",
5195                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
5196                                                         $line_fixed = 1;
5197                                                         $rtrim_before = 1;
5198                                                 }
5199                                         }
5200                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
5201                                                 if (ERROR("SPACING",
5202                                                           "space required after that '$op' $at\n" . $hereptr)) {
5203                                                         $line_fixed = 1;
5204                                                         $last_after = $n;
5205                                                         $space_after = 1;
5206                                                 }
5207                                         }
5208                                         if ($rtrim_before || $space_after) {
5209                                                 if ($rtrim_before) {
5210                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
5211                                                 } else {
5212                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
5213                                                 }
5214                                                 if ($space_after) {
5215                                                         $good .= " ";
5216                                                 }
5217                                         }
5218
5219                                 # '*' as part of a type definition -- reported already.
5220                                 } elsif ($opv eq '*_') {
5221                                         #warn "'*' is part of type\n";
5222
5223                                 # unary operators should have a space before and
5224                                 # none after.  May be left adjacent to another
5225                                 # unary operator, or a cast
5226                                 } elsif ($op eq '!' || $op eq '~' ||
5227                                          $opv eq '*U' || $opv eq '-U' ||
5228                                          $opv eq '&U' || $opv eq '&&U') {
5229                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
5230                                                 if (ERROR("SPACING",
5231                                                           "space required before that '$op' $at\n" . $hereptr)) {
5232                                                         if ($n != $last_after + 2) {
5233                                                                 $good = $fix_elements[$n] . " " . ltrim($fix_elements[$n + 1]);
5234                                                                 $line_fixed = 1;
5235                                                         }
5236                                                 }
5237                                         }
5238                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
5239                                                 # A unary '*' may be const
5240
5241                                         } elsif ($ctx =~ /.xW/) {
5242                                                 if (ERROR("SPACING",
5243                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
5244                                                         $good = $fix_elements[$n] . rtrim($fix_elements[$n + 1]);
5245                                                         if (defined $fix_elements[$n + 2]) {
5246                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
5247                                                         }
5248                                                         $line_fixed = 1;
5249                                                 }
5250                                         }
5251
5252                                 # unary ++ and unary -- are allowed no space on one side.
5253                                 } elsif ($op eq '++' or $op eq '--') {
5254                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
5255                                                 if (ERROR("SPACING",
5256                                                           "space required one side of that '$op' $at\n" . $hereptr)) {
5257                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
5258                                                         $line_fixed = 1;
5259                                                 }
5260                                         }
5261                                         if ($ctx =~ /Wx[BE]/ ||
5262                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
5263                                                 if (ERROR("SPACING",
5264                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
5265                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
5266                                                         $line_fixed = 1;
5267                                                 }
5268                                         }
5269                                         if ($ctx =~ /ExW/) {
5270                                                 if (ERROR("SPACING",
5271                                                           "space prohibited after that '$op' $at\n" . $hereptr)) {
5272                                                         $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
5273                                                         if (defined $fix_elements[$n + 2]) {
5274                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
5275                                                         }
5276                                                         $line_fixed = 1;
5277                                                 }
5278                                         }
5279
5280                                 # << and >> may either have or not have spaces both sides
5281                                 } elsif ($op eq '<<' or $op eq '>>' or
5282                                          $op eq '&' or $op eq '^' or $op eq '|' or
5283                                          $op eq '+' or $op eq '-' or
5284                                          $op eq '*' or $op eq '/' or
5285                                          $op eq '%')
5286                                 {
5287                                         if ($check) {
5288                                                 if (defined $fix_elements[$n + 2] && $ctx !~ /[EW]x[EW]/) {
5289                                                         if (CHK("SPACING",
5290                                                                 "spaces preferred around that '$op' $at\n" . $hereptr)) {
5291                                                                 $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
5292                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
5293                                                                 $line_fixed = 1;
5294                                                         }
5295                                                 } elsif (!defined $fix_elements[$n + 2] && $ctx !~ /Wx[OE]/) {
5296                                                         if (CHK("SPACING",
5297                                                                 "space preferred before that '$op' $at\n" . $hereptr)) {
5298                                                                 $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]);
5299                                                                 $line_fixed = 1;
5300                                                         }
5301                                                 }
5302                                         } elsif ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
5303                                                 if (ERROR("SPACING",
5304                                                           "need consistent spacing around '$op' $at\n" . $hereptr)) {
5305                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
5306                                                         if (defined $fix_elements[$n + 2]) {
5307                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
5308                                                         }
5309                                                         $line_fixed = 1;
5310                                                 }
5311                                         }
5312
5313                                 # A colon needs no spaces before when it is
5314                                 # terminating a case value or a label.
5315                                 } elsif ($opv eq ':C' || $opv eq ':L') {
5316                                         if ($ctx =~ /Wx./ and $realfile !~ m@.*\.lds\.h$@) {
5317                                                 if (ERROR("SPACING",
5318                                                           "space prohibited before that '$op' $at\n" . $hereptr)) {
5319                                                         $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
5320                                                         $line_fixed = 1;
5321                                                 }
5322                                         }
5323
5324                                 # All the others need spaces both sides.
5325                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
5326                                         my $ok = 0;
5327
5328                                         # Ignore email addresses <foo@bar>
5329                                         if (($op eq '<' &&
5330                                              $cc =~ /^\S+\@\S+>/) ||
5331                                             ($op eq '>' &&
5332                                              $ca =~ /<\S+\@\S+$/))
5333                                         {
5334                                                 $ok = 1;
5335                                         }
5336
5337                                         # for asm volatile statements
5338                                         # ignore a colon with another
5339                                         # colon immediately before or after
5340                                         if (($op eq ':') &&
5341                                             ($ca =~ /:$/ || $cc =~ /^:/)) {
5342                                                 $ok = 1;
5343                                         }
5344
5345                                         # messages are ERROR, but ?: are CHK
5346                                         if ($ok == 0) {
5347                                                 my $msg_level = \&ERROR;
5348                                                 $msg_level = \&CHK if (($op eq '?:' || $op eq '?' || $op eq ':') && $ctx =~ /VxV/);
5349
5350                                                 if (&{$msg_level}("SPACING",
5351                                                                   "spaces required around that '$op' $at\n" . $hereptr)) {
5352                                                         $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
5353                                                         if (defined $fix_elements[$n + 2]) {
5354                                                                 $fix_elements[$n + 2] =~ s/^\s+//;
5355                                                         }
5356                                                         $line_fixed = 1;
5357                                                 }
5358                                         }
5359                                 }
5360                                 $off += length($elements[$n + 1]);
5361
5362 ##                              print("n: <$n> GOOD: <$good>\n");
5363
5364                                 $fixed_line = $fixed_line . $good;
5365                         }
5366
5367                         if (($#elements % 2) == 0) {
5368                                 $fixed_line = $fixed_line . $fix_elements[$#elements];
5369                         }
5370
5371                         if ($fix && $line_fixed && $fixed_line ne $fixed[$fixlinenr]) {
5372                                 $fixed[$fixlinenr] = $fixed_line;
5373                         }
5374
5375
5376                 }
5377
5378 # check for whitespace before a non-naked semicolon
5379                 if ($line =~ /^\+.*\S\s+;\s*$/) {
5380                         if (WARN("SPACING",
5381                                  "space prohibited before semicolon\n" . $herecurr) &&
5382                             $fix) {
5383                                 1 while $fixed[$fixlinenr] =~
5384                                     s/^(\+.*\S)\s+;/$1;/;
5385                         }
5386                 }
5387
5388 # check for multiple assignments
5389                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
5390                         CHK("MULTIPLE_ASSIGNMENTS",
5391                             "multiple assignments should be avoided\n" . $herecurr);
5392                 }
5393
5394 ## # check for multiple declarations, allowing for a function declaration
5395 ## # continuation.
5396 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
5397 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
5398 ##
5399 ##                      # Remove any bracketed sections to ensure we do not
5400 ##                      # falsely report the parameters of functions.
5401 ##                      my $ln = $line;
5402 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
5403 ##                      }
5404 ##                      if ($ln =~ /,/) {
5405 ##                              WARN("MULTIPLE_DECLARATION",
5406 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
5407 ##                      }
5408 ##              }
5409
5410 #need space before brace following if, while, etc
5411                 if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
5412                     $line =~ /\b(?:else|do)\{/) {
5413                         if (ERROR("SPACING",
5414                                   "space required before the open brace '{'\n" . $herecurr) &&
5415                             $fix) {
5416                                 $fixed[$fixlinenr] =~ s/^(\+.*(?:do|else|\)))\{/$1 {/;
5417                         }
5418                 }
5419
5420 ## # check for blank lines before declarations
5421 ##              if ($line =~ /^.\t+$Type\s+$Ident(?:\s*=.*)?;/ &&
5422 ##                  $prevrawline =~ /^.\s*$/) {
5423 ##                      WARN("SPACING",
5424 ##                           "No blank lines before declarations\n" . $hereprev);
5425 ##              }
5426 ##
5427
5428 # closing brace should have a space following it when it has anything
5429 # on the line
5430                 if ($line =~ /}(?!(?:,|;|\)|\}))\S/) {
5431                         if (ERROR("SPACING",
5432                                   "space required after that close brace '}'\n" . $herecurr) &&
5433                             $fix) {
5434                                 $fixed[$fixlinenr] =~
5435                                     s/}((?!(?:,|;|\)))\S)/} $1/;
5436                         }
5437                 }
5438
5439 # check spacing on square brackets
5440                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
5441                         if (ERROR("SPACING",
5442                                   "space prohibited after that open square bracket '['\n" . $herecurr) &&
5443                             $fix) {
5444                                 $fixed[$fixlinenr] =~
5445                                     s/\[\s+/\[/;
5446                         }
5447                 }
5448                 if ($line =~ /\s\]/) {
5449                         if (ERROR("SPACING",
5450                                   "space prohibited before that close square bracket ']'\n" . $herecurr) &&
5451                             $fix) {
5452                                 $fixed[$fixlinenr] =~
5453                                     s/\s+\]/\]/;
5454                         }
5455                 }
5456
5457 # check spacing on parentheses
5458                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
5459                     $line !~ /for\s*\(\s+;/) {
5460                         if (ERROR("SPACING",
5461                                   "space prohibited after that open parenthesis '('\n" . $herecurr) &&
5462                             $fix) {
5463                                 $fixed[$fixlinenr] =~
5464                                     s/\(\s+/\(/;
5465                         }
5466                 }
5467                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
5468                     $line !~ /for\s*\(.*;\s+\)/ &&
5469                     $line !~ /:\s+\)/) {
5470                         if (ERROR("SPACING",
5471                                   "space prohibited before that close parenthesis ')'\n" . $herecurr) &&
5472                             $fix) {
5473                                 $fixed[$fixlinenr] =~
5474                                     s/\s+\)/\)/;
5475                         }
5476                 }
5477
5478 # check unnecessary parentheses around addressof/dereference single $Lvals
5479 # ie: &(foo->bar) should be &foo->bar and *(foo->bar) should be *foo->bar
5480
5481                 while ($line =~ /(?:[^&]&\s*|\*)\(\s*($Ident\s*(?:$Member\s*)+)\s*\)/g) {
5482                         my $var = $1;
5483                         if (CHK("UNNECESSARY_PARENTHESES",
5484                                 "Unnecessary parentheses around $var\n" . $herecurr) &&
5485                             $fix) {
5486                                 $fixed[$fixlinenr] =~ s/\(\s*\Q$var\E\s*\)/$var/;
5487                         }
5488                 }
5489
5490 # check for unnecessary parentheses around function pointer uses
5491 # ie: (foo->bar)(); should be foo->bar();
5492 # but not "if (foo->bar) (" to avoid some false positives
5493                 if ($line =~ /(\bif\s*|)(\(\s*$Ident\s*(?:$Member\s*)+\))[ \t]*\(/ && $1 !~ /^if/) {
5494                         my $var = $2;
5495                         if (CHK("UNNECESSARY_PARENTHESES",
5496                                 "Unnecessary parentheses around function pointer $var\n" . $herecurr) &&
5497                             $fix) {
5498                                 my $var2 = deparenthesize($var);
5499                                 $var2 =~ s/\s//g;
5500                                 $fixed[$fixlinenr] =~ s/\Q$var\E/$var2/;
5501                         }
5502                 }
5503
5504 # check for unnecessary parentheses around comparisons in if uses
5505 # when !drivers/staging or command-line uses --strict
5506                 if (($realfile !~ m@^(?:drivers/staging/)@ || $check_orig) &&
5507                     $perl_version_ok && defined($stat) &&
5508                     $stat =~ /(^.\s*if\s*($balanced_parens))/) {
5509                         my $if_stat = $1;
5510                         my $test = substr($2, 1, -1);
5511                         my $herectx;
5512                         while ($test =~ /(?:^|[^\w\&\!\~])+\s*\(\s*([\&\!\~]?\s*$Lval\s*(?:$Compare\s*$FuncArg)?)\s*\)/g) {
5513                                 my $match = $1;
5514                                 # avoid parentheses around potential macro args
5515                                 next if ($match =~ /^\s*\w+\s*$/);
5516                                 if (!defined($herectx)) {
5517                                         $herectx = $here . "\n";
5518                                         my $cnt = statement_rawlines($if_stat);
5519                                         for (my $n = 0; $n < $cnt; $n++) {
5520                                                 my $rl = raw_line($linenr, $n);
5521                                                 $herectx .=  $rl . "\n";
5522                                                 last if $rl =~ /^[ \+].*\{/;
5523                                         }
5524                                 }
5525                                 CHK("UNNECESSARY_PARENTHESES",
5526                                     "Unnecessary parentheses around '$match'\n" . $herectx);
5527                         }
5528                 }
5529
5530 # check that goto labels aren't indented (allow a single space indentation)
5531 # and ignore bitfield definitions like foo:1
5532 # Strictly, labels can have whitespace after the identifier and before the :
5533 # but this is not allowed here as many ?: uses would appear to be labels
5534                 if ($sline =~ /^.\s+[A-Za-z_][A-Za-z\d_]*:(?!\s*\d+)/ &&
5535                     $sline !~ /^. [A-Za-z\d_][A-Za-z\d_]*:/ &&
5536                     $sline !~ /^.\s+default:/) {
5537                         if (WARN("INDENTED_LABEL",
5538                                  "labels should not be indented\n" . $herecurr) &&
5539                             $fix) {
5540                                 $fixed[$fixlinenr] =~
5541                                     s/^(.)\s+/$1/;
5542                         }
5543                 }
5544
5545 # check if a statement with a comma should be two statements like:
5546 #       foo = bar(),    /* comma should be semicolon */
5547 #       bar = baz();
5548                 if (defined($stat) &&
5549                     $stat =~ /^\+\s*(?:$Lval\s*$Assignment\s*)?$FuncArg\s*,\s*(?:$Lval\s*$Assignment\s*)?$FuncArg\s*;\s*$/) {
5550                         my $cnt = statement_rawlines($stat);
5551                         my $herectx = get_stat_here($linenr, $cnt, $here);
5552                         WARN("SUSPECT_COMMA_SEMICOLON",
5553                              "Possible comma where semicolon could be used\n" . $herectx);
5554                 }
5555
5556 # return is not a function
5557                 if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) {
5558                         my $spacing = $1;
5559                         if ($perl_version_ok &&
5560                             $stat =~ /^.\s*return\s*($balanced_parens)\s*;\s*$/) {
5561                                 my $value = $1;
5562                                 $value = deparenthesize($value);
5563                                 if ($value =~ m/^\s*$FuncArg\s*(?:\?|$)/) {
5564                                         ERROR("RETURN_PARENTHESES",
5565                                               "return is not a function, parentheses are not required\n" . $herecurr);
5566                                 }
5567                         } elsif ($spacing !~ /\s+/) {
5568                                 ERROR("SPACING",
5569                                       "space required before the open parenthesis '('\n" . $herecurr);
5570                         }
5571                 }
5572
5573 # unnecessary return in a void function
5574 # at end-of-function, with the previous line a single leading tab, then return;
5575 # and the line before that not a goto label target like "out:"
5576                 if ($sline =~ /^[ \+]}\s*$/ &&
5577                     $prevline =~ /^\+\treturn\s*;\s*$/ &&
5578                     $linenr >= 3 &&
5579                     $lines[$linenr - 3] =~ /^[ +]/ &&
5580                     $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
5581                         WARN("RETURN_VOID",
5582                              "void function return statements are not generally useful\n" . $hereprev);
5583                 }
5584
5585 # if statements using unnecessary parentheses - ie: if ((foo == bar))
5586                 if ($perl_version_ok &&
5587                     $line =~ /\bif\s*((?:\(\s*){2,})/) {
5588                         my $openparens = $1;
5589                         my $count = $openparens =~ tr@\(@\(@;
5590                         my $msg = "";
5591                         if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
5592                                 my $comp = $4;  #Not $1 because of $LvalOrFunc
5593                                 $msg = " - maybe == should be = ?" if ($comp eq "==");
5594                                 WARN("UNNECESSARY_PARENTHESES",
5595                                      "Unnecessary parentheses$msg\n" . $herecurr);
5596                         }
5597                 }
5598
5599 # comparisons with a constant or upper case identifier on the left
5600 #       avoid cases like "foo + BAR < baz"
5601 #       only fix matches surrounded by parentheses to avoid incorrect
5602 #       conversions like "FOO < baz() + 5" being "misfixed" to "baz() > FOO + 5"
5603                 if ($perl_version_ok &&
5604                     $line =~ /^\+(.*)\b($Constant|[A-Z_][A-Z0-9_]*)\s*($Compare)\s*($LvalOrFunc)/) {
5605                         my $lead = $1;
5606                         my $const = $2;
5607                         my $comp = $3;
5608                         my $to = $4;
5609                         my $newcomp = $comp;
5610                         if ($lead !~ /(?:$Operators|\.)\s*$/ &&
5611                             $to !~ /^(?:Constant|[A-Z_][A-Z0-9_]*)$/ &&
5612                             WARN("CONSTANT_COMPARISON",
5613                                  "Comparisons should place the constant on the right side of the test\n" . $herecurr) &&
5614                             $fix) {
5615                                 if ($comp eq "<") {
5616                                         $newcomp = ">";
5617                                 } elsif ($comp eq "<=") {
5618                                         $newcomp = ">=";
5619                                 } elsif ($comp eq ">") {
5620                                         $newcomp = "<";
5621                                 } elsif ($comp eq ">=") {
5622                                         $newcomp = "<=";
5623                                 }
5624                                 $fixed[$fixlinenr] =~ s/\(\s*\Q$const\E\s*$Compare\s*\Q$to\E\s*\)/($to $newcomp $const)/;
5625                         }
5626                 }
5627
5628 # Return of what appears to be an errno should normally be negative
5629                 if ($sline =~ /\breturn(?:\s*\(+\s*|\s+)(E[A-Z]+)(?:\s*\)+\s*|\s*)[;:,]/) {
5630                         my $name = $1;
5631                         if ($name ne 'EOF' && $name ne 'ERROR' && $name !~ /^EPOLL/) {
5632                                 WARN("USE_NEGATIVE_ERRNO",
5633                                      "return of an errno should typically be negative (ie: return -$1)\n" . $herecurr);
5634                         }
5635                 }
5636
5637 # Need a space before open parenthesis after if, while etc
5638                 if ($line =~ /\b(if|while|for|switch)\(/) {
5639                         if (ERROR("SPACING",
5640                                   "space required before the open parenthesis '('\n" . $herecurr) &&
5641                             $fix) {
5642                                 $fixed[$fixlinenr] =~
5643                                     s/\b(if|while|for|switch)\(/$1 \(/;
5644                         }
5645                 }
5646
5647 # Check for illegal assignment in if conditional -- and check for trailing
5648 # statements after the conditional.
5649                 if ($line =~ /do\s*(?!{)/) {
5650                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
5651                                 ctx_statement_block($linenr, $realcnt, 0)
5652                                         if (!defined $stat);
5653                         my ($stat_next) = ctx_statement_block($line_nr_next,
5654                                                 $remain_next, $off_next);
5655                         $stat_next =~ s/\n./\n /g;
5656                         ##print "stat<$stat> stat_next<$stat_next>\n";
5657
5658                         if ($stat_next =~ /^\s*while\b/) {
5659                                 # If the statement carries leading newlines,
5660                                 # then count those as offsets.
5661                                 my ($whitespace) =
5662                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
5663                                 my $offset =
5664                                         statement_rawlines($whitespace) - 1;
5665
5666                                 $suppress_whiletrailers{$line_nr_next +
5667                                                                 $offset} = 1;
5668                         }
5669                 }
5670                 if (!defined $suppress_whiletrailers{$linenr} &&
5671                     defined($stat) && defined($cond) &&
5672                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
5673                         my ($s, $c) = ($stat, $cond);
5674
5675                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
5676                                 if (ERROR("ASSIGN_IN_IF",
5677                                           "do not use assignment in if condition\n" . $herecurr) &&
5678                                     $fix && $perl_version_ok) {
5679                                         if ($rawline =~ /^\+(\s+)if\s*\(\s*(\!)?\s*\(\s*(($Lval)\s*=\s*$LvalOrFunc)\s*\)\s*(?:($Compare)\s*($FuncArg))?\s*\)\s*(\{)?\s*$/) {
5680                                                 my $space = $1;
5681                                                 my $not = $2;
5682                                                 my $statement = $3;
5683                                                 my $assigned = $4;
5684                                                 my $test = $8;
5685                                                 my $against = $9;
5686                                                 my $brace = $15;
5687                                                 fix_delete_line($fixlinenr, $rawline);
5688                                                 fix_insert_line($fixlinenr, "$space$statement;");
5689                                                 my $newline = "${space}if (";
5690                                                 $newline .= '!' if defined($not);
5691                                                 $newline .= '(' if (defined $not && defined($test) && defined($against));
5692                                                 $newline .= "$assigned";
5693                                                 $newline .= " $test $against" if (defined($test) && defined($against));
5694                                                 $newline .= ')' if (defined $not && defined($test) && defined($against));
5695                                                 $newline .= ')';
5696                                                 $newline .= " {" if (defined($brace));
5697                                                 fix_insert_line($fixlinenr + 1, $newline);
5698                                         }
5699                                 }
5700                         }
5701
5702                         # Find out what is on the end of the line after the
5703                         # conditional.
5704                         substr($s, 0, length($c), '');
5705                         $s =~ s/\n.*//g;
5706                         $s =~ s/$;//g;  # Remove any comments
5707                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
5708                             $c !~ /}\s*while\s*/)
5709                         {
5710                                 # Find out how long the conditional actually is.
5711                                 my @newlines = ($c =~ /\n/gs);
5712                                 my $cond_lines = 1 + $#newlines;
5713                                 my $stat_real = '';
5714
5715                                 $stat_real = raw_line($linenr, $cond_lines)
5716                                                         . "\n" if ($cond_lines);
5717                                 if (defined($stat_real) && $cond_lines > 1) {
5718                                         $stat_real = "[...]\n$stat_real";
5719                                 }
5720
5721                                 ERROR("TRAILING_STATEMENTS",
5722                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
5723                         }
5724                 }
5725
5726 # Check for bitwise tests written as boolean
5727                 if ($line =~ /
5728                         (?:
5729                                 (?:\[|\(|\&\&|\|\|)
5730                                 \s*0[xX][0-9]+\s*
5731                                 (?:\&\&|\|\|)
5732                         |
5733                                 (?:\&\&|\|\|)
5734                                 \s*0[xX][0-9]+\s*
5735                                 (?:\&\&|\|\||\)|\])
5736                         )/x)
5737                 {
5738                         WARN("HEXADECIMAL_BOOLEAN_TEST",
5739                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
5740                 }
5741
5742 # if and else should not have general statements after it
5743                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
5744                         my $s = $1;
5745                         $s =~ s/$;//g;  # Remove any comments
5746                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
5747                                 ERROR("TRAILING_STATEMENTS",
5748                                       "trailing statements should be on next line\n" . $herecurr);
5749                         }
5750                 }
5751 # if should not continue a brace
5752                 if ($line =~ /}\s*if\b/) {
5753                         ERROR("TRAILING_STATEMENTS",
5754                               "trailing statements should be on next line (or did you mean 'else if'?)\n" .
5755                                 $herecurr);
5756                 }
5757 # case and default should not have general statements after them
5758                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
5759                     $line !~ /\G(?:
5760                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
5761                         \s*return\s+
5762                     )/xg)
5763                 {
5764                         ERROR("TRAILING_STATEMENTS",
5765                               "trailing statements should be on next line\n" . $herecurr);
5766                 }
5767
5768                 # Check for }<nl>else {, these must be at the same
5769                 # indent level to be relevant to each other.
5770                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ &&
5771                     $previndent == $indent) {
5772                         if (ERROR("ELSE_AFTER_BRACE",
5773                                   "else should follow close brace '}'\n" . $hereprev) &&
5774                             $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
5775                                 fix_delete_line($fixlinenr - 1, $prevrawline);
5776                                 fix_delete_line($fixlinenr, $rawline);
5777                                 my $fixedline = $prevrawline;
5778                                 $fixedline =~ s/}\s*$//;
5779                                 if ($fixedline !~ /^\+\s*$/) {
5780                                         fix_insert_line($fixlinenr, $fixedline);
5781                                 }
5782                                 $fixedline = $rawline;
5783                                 $fixedline =~ s/^(.\s*)else/$1} else/;
5784                                 fix_insert_line($fixlinenr, $fixedline);
5785                         }
5786                 }
5787
5788                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ &&
5789                     $previndent == $indent) {
5790                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
5791
5792                         # Find out what is on the end of the line after the
5793                         # conditional.
5794                         substr($s, 0, length($c), '');
5795                         $s =~ s/\n.*//g;
5796
5797                         if ($s =~ /^\s*;/) {
5798                                 if (ERROR("WHILE_AFTER_BRACE",
5799                                           "while should follow close brace '}'\n" . $hereprev) &&
5800                                     $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
5801                                         fix_delete_line($fixlinenr - 1, $prevrawline);
5802                                         fix_delete_line($fixlinenr, $rawline);
5803                                         my $fixedline = $prevrawline;
5804                                         my $trailing = $rawline;
5805                                         $trailing =~ s/^\+//;
5806                                         $trailing = trim($trailing);
5807                                         $fixedline =~ s/}\s*$/} $trailing/;
5808                                         fix_insert_line($fixlinenr, $fixedline);
5809                                 }
5810                         }
5811                 }
5812
5813 #Specific variable tests
5814                 while ($line =~ m{($Constant|$Lval)}g) {
5815                         my $var = $1;
5816
5817 #CamelCase
5818                         if ($var !~ /^$Constant$/ &&
5819                             $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
5820 #Ignore some autogenerated defines and enum values
5821                             $var !~ /^(?:[A-Z]+_){1,5}[A-Z]{1,3}[a-z]/ &&
5822 #Ignore Page<foo> variants
5823                             $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
5824 #Ignore SI style variants like nS, mV and dB
5825 #(ie: max_uV, regulator_min_uA_show, RANGE_mA_VALUE)
5826                             $var !~ /^(?:[a-z0-9_]*|[A-Z0-9_]*)?_?[a-z][A-Z](?:_[a-z0-9_]+|_[A-Z0-9_]+)?$/ &&
5827 #Ignore some three character SI units explicitly, like MiB and KHz
5828                             $var !~ /^(?:[a-z_]*?)_?(?:[KMGT]iB|[KMGT]?Hz)(?:_[a-z_]+)?$/) {
5829                                 while ($var =~ m{($Ident)}g) {
5830                                         my $word = $1;
5831                                         next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/);
5832                                         if ($check) {
5833                                                 seed_camelcase_includes();
5834                                                 if (!$file && !$camelcase_file_seeded) {
5835                                                         seed_camelcase_file($realfile);
5836                                                         $camelcase_file_seeded = 1;
5837                                                 }
5838                                         }
5839                                         if (!defined $camelcase{$word}) {
5840                                                 $camelcase{$word} = 1;
5841                                                 CHK("CAMELCASE",
5842                                                     "Avoid CamelCase: <$word>\n" . $herecurr);
5843                                         }
5844                                 }
5845                         }
5846                 }
5847
5848 #no spaces allowed after \ in define
5849                 if ($line =~ /\#\s*define.*\\\s+$/) {
5850                         if (WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
5851                                  "Whitespace after \\ makes next lines useless\n" . $herecurr) &&
5852                             $fix) {
5853                                 $fixed[$fixlinenr] =~ s/\s+$//;
5854                         }
5855                 }
5856
5857 # warn if <asm/foo.h> is #included and <linux/foo.h> is available and includes
5858 # itself <asm/foo.h> (uses RAW line)
5859                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
5860                         my $file = "$1.h";
5861                         my $checkfile = "include/linux/$file";
5862                         if (-f "$root/$checkfile" &&
5863                             $realfile ne $checkfile &&
5864                             $1 !~ /$allowed_asm_includes/)
5865                         {
5866                                 my $asminclude = `grep -Ec "#include\\s+<asm/$file>" $root/$checkfile`;
5867                                 if ($asminclude > 0) {
5868                                         if ($realfile =~ m{^arch/}) {
5869                                                 CHK("ARCH_INCLUDE_LINUX",
5870                                                     "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
5871                                         } else {
5872                                                 WARN("INCLUDE_LINUX",
5873                                                      "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
5874                                         }
5875                                 }
5876                         }
5877                 }
5878
5879 # multi-statement macros should be enclosed in a do while loop, grab the
5880 # first statement and ensure its the whole macro if its not enclosed
5881 # in a known good container
5882                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
5883                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
5884                         my $ln = $linenr;
5885                         my $cnt = $realcnt;
5886                         my ($off, $dstat, $dcond, $rest);
5887                         my $ctx = '';
5888                         my $has_flow_statement = 0;
5889                         my $has_arg_concat = 0;
5890                         ($dstat, $dcond, $ln, $cnt, $off) =
5891                                 ctx_statement_block($linenr, $realcnt, 0);
5892                         $ctx = $dstat;
5893                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
5894                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
5895
5896                         $has_flow_statement = 1 if ($ctx =~ /\b(goto|return)\b/);
5897                         $has_arg_concat = 1 if ($ctx =~ /\#\#/ && $ctx !~ /\#\#\s*(?:__VA_ARGS__|args)\b/);
5898
5899                         $dstat =~ s/^.\s*\#\s*define\s+$Ident(\([^\)]*\))?\s*//;
5900                         my $define_args = $1;
5901                         my $define_stmt = $dstat;
5902                         my @def_args = ();
5903
5904                         if (defined $define_args && $define_args ne "") {
5905                                 $define_args = substr($define_args, 1, length($define_args) - 2);
5906                                 $define_args =~ s/\s*//g;
5907                                 $define_args =~ s/\\\+?//g;
5908                                 @def_args = split(",", $define_args);
5909                         }
5910
5911                         $dstat =~ s/$;//g;
5912                         $dstat =~ s/\\\n.//g;
5913                         $dstat =~ s/^\s*//s;
5914                         $dstat =~ s/\s*$//s;
5915
5916                         # Flatten any parentheses and braces
5917                         while ($dstat =~ s/\([^\(\)]*\)/1u/ ||
5918                                $dstat =~ s/\{[^\{\}]*\}/1u/ ||
5919                                $dstat =~ s/.\[[^\[\]]*\]/1u/)
5920                         {
5921                         }
5922
5923                         # Flatten any obvious string concatenation.
5924                         while ($dstat =~ s/($String)\s*$Ident/$1/ ||
5925                                $dstat =~ s/$Ident\s*($String)/$1/)
5926                         {
5927                         }
5928
5929                         # Make asm volatile uses seem like a generic function
5930                         $dstat =~ s/\b_*asm_*\s+_*volatile_*\b/asm_volatile/g;
5931
5932                         my $exceptions = qr{
5933                                 $Declare|
5934                                 module_param_named|
5935                                 MODULE_PARM_DESC|
5936                                 DECLARE_PER_CPU|
5937                                 DEFINE_PER_CPU|
5938                                 __typeof__\(|
5939                                 union|
5940                                 struct|
5941                                 \.$Ident\s*=\s*|
5942                                 ^\"|\"$|
5943                                 ^\[
5944                         }x;
5945                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
5946
5947                         $ctx =~ s/\n*$//;
5948                         my $stmt_cnt = statement_rawlines($ctx);
5949                         my $herectx = get_stat_here($linenr, $stmt_cnt, $here);
5950
5951                         if ($dstat ne '' &&
5952                             $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
5953                             $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
5954                             $dstat !~ /^[!~-]?(?:$Lval|$Constant)$/ &&          # 10 // foo() // !foo // ~foo // -foo // foo->bar // foo.bar->baz
5955                             $dstat !~ /^'X'$/ && $dstat !~ /^'XX'$/ &&                  # character constants
5956                             $dstat !~ /$exceptions/ &&
5957                             $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
5958                             $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&          # stringification #foo
5959                             $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&       # do {...} while (...); // do {...} while (...)
5960                             $dstat !~ /^while\s*$Constant\s*$Constant\s*$/ &&           # while (...) {...}
5961                             $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
5962                             $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
5963                             $dstat !~ /^do\s*{/ &&                                      # do {...
5964                             $dstat !~ /^\(\{/ &&                                                # ({...
5965                             $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
5966                         {
5967                                 if ($dstat =~ /^\s*if\b/) {
5968                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
5969                                               "Macros starting with if should be enclosed by a do - while loop to avoid possible if/else logic defects\n" . "$herectx");
5970                                 } elsif ($dstat =~ /;/) {
5971                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
5972                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
5973                                 } else {
5974                                         ERROR("COMPLEX_MACRO",
5975                                               "Macros with complex values should be enclosed in parentheses\n" . "$herectx");
5976                                 }
5977
5978                         }
5979
5980                         # Make $define_stmt single line, comment-free, etc
5981                         my @stmt_array = split('\n', $define_stmt);
5982                         my $first = 1;
5983                         $define_stmt = "";
5984                         foreach my $l (@stmt_array) {
5985                                 $l =~ s/\\$//;
5986                                 if ($first) {
5987                                         $define_stmt = $l;
5988                                         $first = 0;
5989                                 } elsif ($l =~ /^[\+ ]/) {
5990                                         $define_stmt .= substr($l, 1);
5991                                 }
5992                         }
5993                         $define_stmt =~ s/$;//g;
5994                         $define_stmt =~ s/\s+/ /g;
5995                         $define_stmt = trim($define_stmt);
5996
5997 # check if any macro arguments are reused (ignore '...' and 'type')
5998                         foreach my $arg (@def_args) {
5999                                 next if ($arg =~ /\.\.\./);
6000                                 next if ($arg =~ /^type$/i);
6001                                 my $tmp_stmt = $define_stmt;
6002                                 $tmp_stmt =~ s/\b(__must_be_array|offsetof|sizeof|sizeof_field|__stringify|typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
6003                                 $tmp_stmt =~ s/\#+\s*$arg\b//g;
6004                                 $tmp_stmt =~ s/\b$arg\s*\#\#//g;
6005                                 my $use_cnt = () = $tmp_stmt =~ /\b$arg\b/g;
6006                                 if ($use_cnt > 1) {
6007                                         CHK("MACRO_ARG_REUSE",
6008                                             "Macro argument reuse '$arg' - possible side-effects?\n" . "$herectx");
6009                                     }
6010 # check if any macro arguments may have other precedence issues
6011                                 if ($tmp_stmt =~ m/($Operators)?\s*\b$arg\b\s*($Operators)?/m &&
6012                                     ((defined($1) && $1 ne ',') ||
6013                                      (defined($2) && $2 ne ','))) {
6014                                         CHK("MACRO_ARG_PRECEDENCE",
6015                                             "Macro argument '$arg' may be better as '($arg)' to avoid precedence issues\n" . "$herectx");
6016                                 }
6017                         }
6018
6019 # check for macros with flow control, but without ## concatenation
6020 # ## concatenation is commonly a macro that defines a function so ignore those
6021                         if ($has_flow_statement && !$has_arg_concat) {
6022                                 my $cnt = statement_rawlines($ctx);
6023                                 my $herectx = get_stat_here($linenr, $cnt, $here);
6024
6025                                 WARN("MACRO_WITH_FLOW_CONTROL",
6026                                      "Macros with flow control statements should be avoided\n" . "$herectx");
6027                         }
6028
6029 # check for line continuations outside of #defines, preprocessor #, and asm
6030
6031                 } else {
6032                         if ($prevline !~ /^..*\\$/ &&
6033                             $line !~ /^\+\s*\#.*\\$/ &&         # preprocessor
6034                             $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&   # asm
6035                             $line =~ /^\+.*\\$/) {
6036                                 WARN("LINE_CONTINUATIONS",
6037                                      "Avoid unnecessary line continuations\n" . $herecurr);
6038                         }
6039                 }
6040
6041 # do {} while (0) macro tests:
6042 # single-statement macros do not need to be enclosed in do while (0) loop,
6043 # macro should not end with a semicolon
6044                 if ($perl_version_ok &&
6045                     $realfile !~ m@/vmlinux.lds.h$@ &&
6046                     $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
6047                         my $ln = $linenr;
6048                         my $cnt = $realcnt;
6049                         my ($off, $dstat, $dcond, $rest);
6050                         my $ctx = '';
6051                         ($dstat, $dcond, $ln, $cnt, $off) =
6052                                 ctx_statement_block($linenr, $realcnt, 0);
6053                         $ctx = $dstat;
6054
6055                         $dstat =~ s/\\\n.//g;
6056                         $dstat =~ s/$;/ /g;
6057
6058                         if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
6059                                 my $stmts = $2;
6060                                 my $semis = $3;
6061
6062                                 $ctx =~ s/\n*$//;
6063                                 my $cnt = statement_rawlines($ctx);
6064                                 my $herectx = get_stat_here($linenr, $cnt, $here);
6065
6066                                 if (($stmts =~ tr/;/;/) == 1 &&
6067                                     $stmts !~ /^\s*(if|while|for|switch)\b/) {
6068                                         WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
6069                                              "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
6070                                 }
6071                                 if (defined $semis && $semis ne "") {
6072                                         WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
6073                                              "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
6074                                 }
6075                         } elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) {
6076                                 $ctx =~ s/\n*$//;
6077                                 my $cnt = statement_rawlines($ctx);
6078                                 my $herectx = get_stat_here($linenr, $cnt, $here);
6079
6080                                 WARN("TRAILING_SEMICOLON",
6081                                      "macros should not use a trailing semicolon\n" . "$herectx");
6082                         }
6083                 }
6084
6085 # check for redundant bracing round if etc
6086                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
6087                         my ($level, $endln, @chunks) =
6088                                 ctx_statement_full($linenr, $realcnt, 1);
6089                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
6090                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
6091                         if ($#chunks > 0 && $level == 0) {
6092                                 my @allowed = ();
6093                                 my $allow = 0;
6094                                 my $seen = 0;
6095                                 my $herectx = $here . "\n";
6096                                 my $ln = $linenr - 1;
6097                                 for my $chunk (@chunks) {
6098                                         my ($cond, $block) = @{$chunk};
6099
6100                                         # If the condition carries leading newlines, then count those as offsets.
6101                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
6102                                         my $offset = statement_rawlines($whitespace) - 1;
6103
6104                                         $allowed[$allow] = 0;
6105                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
6106
6107                                         # We have looked at and allowed this specific line.
6108                                         $suppress_ifbraces{$ln + $offset} = 1;
6109
6110                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
6111                                         $ln += statement_rawlines($block) - 1;
6112
6113                                         substr($block, 0, length($cond), '');
6114
6115                                         $seen++ if ($block =~ /^\s*{/);
6116
6117                                         #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
6118                                         if (statement_lines($cond) > 1) {
6119                                                 #print "APW: ALLOWED: cond<$cond>\n";
6120                                                 $allowed[$allow] = 1;
6121                                         }
6122                                         if ($block =~/\b(?:if|for|while)\b/) {
6123                                                 #print "APW: ALLOWED: block<$block>\n";
6124                                                 $allowed[$allow] = 1;
6125                                         }
6126                                         if (statement_block_size($block) > 1) {
6127                                                 #print "APW: ALLOWED: lines block<$block>\n";
6128                                                 $allowed[$allow] = 1;
6129                                         }
6130                                         $allow++;
6131                                 }
6132                                 if ($seen) {
6133                                         my $sum_allowed = 0;
6134                                         foreach (@allowed) {
6135                                                 $sum_allowed += $_;
6136                                         }
6137                                         if ($sum_allowed == 0) {
6138                                                 WARN("BRACES",
6139                                                      "braces {} are not necessary for any arm of this statement\n" . $herectx);
6140                                         } elsif ($sum_allowed != $allow &&
6141                                                  $seen != $allow) {
6142                                                 CHK("BRACES",
6143                                                     "braces {} should be used on all arms of this statement\n" . $herectx);
6144                                         }
6145                                 }
6146                         }
6147                 }
6148                 if (!defined $suppress_ifbraces{$linenr - 1} &&
6149                                         $line =~ /\b(if|while|for|else)\b/) {
6150                         my $allowed = 0;
6151
6152                         # Check the pre-context.
6153                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
6154                                 #print "APW: ALLOWED: pre<$1>\n";
6155                                 $allowed = 1;
6156                         }
6157
6158                         my ($level, $endln, @chunks) =
6159                                 ctx_statement_full($linenr, $realcnt, $-[0]);
6160
6161                         # Check the condition.
6162                         my ($cond, $block) = @{$chunks[0]};
6163                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
6164                         if (defined $cond) {
6165                                 substr($block, 0, length($cond), '');
6166                         }
6167                         if (statement_lines($cond) > 1) {
6168                                 #print "APW: ALLOWED: cond<$cond>\n";
6169                                 $allowed = 1;
6170                         }
6171                         if ($block =~/\b(?:if|for|while)\b/) {
6172                                 #print "APW: ALLOWED: block<$block>\n";
6173                                 $allowed = 1;
6174                         }
6175                         if (statement_block_size($block) > 1) {
6176                                 #print "APW: ALLOWED: lines block<$block>\n";
6177                                 $allowed = 1;
6178                         }
6179                         # Check the post-context.
6180                         if (defined $chunks[1]) {
6181                                 my ($cond, $block) = @{$chunks[1]};
6182                                 if (defined $cond) {
6183                                         substr($block, 0, length($cond), '');
6184                                 }
6185                                 if ($block =~ /^\s*\{/) {
6186                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
6187                                         $allowed = 1;
6188                                 }
6189                         }
6190                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
6191                                 my $cnt = statement_rawlines($block);
6192                                 my $herectx = get_stat_here($linenr, $cnt, $here);
6193
6194                                 WARN("BRACES",
6195                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
6196                         }
6197                 }
6198
6199 # check for single line unbalanced braces
6200                 if ($sline =~ /^.\s*\}\s*else\s*$/ ||
6201                     $sline =~ /^.\s*else\s*\{\s*$/) {
6202                         CHK("BRACES", "Unbalanced braces around else statement\n" . $herecurr);
6203                 }
6204
6205 # check for unnecessary blank lines around braces
6206                 if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) {
6207                         if (CHK("BRACES",
6208                                 "Blank lines aren't necessary before a close brace '}'\n" . $hereprev) &&
6209                             $fix && $prevrawline =~ /^\+/) {
6210                                 fix_delete_line($fixlinenr - 1, $prevrawline);
6211                         }
6212                 }
6213                 if (($rawline =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
6214                         if (CHK("BRACES",
6215                                 "Blank lines aren't necessary after an open brace '{'\n" . $hereprev) &&
6216                             $fix) {
6217                                 fix_delete_line($fixlinenr, $rawline);
6218                         }
6219                 }
6220
6221 # no volatiles please
6222                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
6223                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
6224                         WARN("VOLATILE",
6225                              "Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst\n" . $herecurr);
6226                 }
6227
6228 # Check for user-visible strings broken across lines, which breaks the ability
6229 # to grep for the string.  Make exceptions when the previous string ends in a
6230 # newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
6231 # (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
6232                 if ($line =~ /^\+\s*$String/ &&
6233                     $prevline =~ /"\s*$/ &&
6234                     $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
6235                         if (WARN("SPLIT_STRING",
6236                                  "quoted string split across lines\n" . $hereprev) &&
6237                                      $fix &&
6238                                      $prevrawline =~ /^\+.*"\s*$/ &&
6239                                      $last_coalesced_string_linenr != $linenr - 1) {
6240                                 my $extracted_string = get_quoted_string($line, $rawline);
6241                                 my $comma_close = "";
6242                                 if ($rawline =~ /\Q$extracted_string\E(\s*\)\s*;\s*$|\s*,\s*)/) {
6243                                         $comma_close = $1;
6244                                 }
6245
6246                                 fix_delete_line($fixlinenr - 1, $prevrawline);
6247                                 fix_delete_line($fixlinenr, $rawline);
6248                                 my $fixedline = $prevrawline;
6249                                 $fixedline =~ s/"\s*$//;
6250                                 $fixedline .= substr($extracted_string, 1) . trim($comma_close);
6251                                 fix_insert_line($fixlinenr - 1, $fixedline);
6252                                 $fixedline = $rawline;
6253                                 $fixedline =~ s/\Q$extracted_string\E\Q$comma_close\E//;
6254                                 if ($fixedline !~ /\+\s*$/) {
6255                                         fix_insert_line($fixlinenr, $fixedline);
6256                                 }
6257                                 $last_coalesced_string_linenr = $linenr;
6258                         }
6259                 }
6260
6261 # check for missing a space in a string concatenation
6262                 if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) {
6263                         WARN('MISSING_SPACE',
6264                              "break quoted strings at a space character\n" . $hereprev);
6265                 }
6266
6267 # check for an embedded function name in a string when the function is known
6268 # This does not work very well for -f --file checking as it depends on patch
6269 # context providing the function name or a single line form for in-file
6270 # function declarations
6271                 if ($line =~ /^\+.*$String/ &&
6272                     defined($context_function) &&
6273                     get_quoted_string($line, $rawline) =~ /\b$context_function\b/ &&
6274                     length(get_quoted_string($line, $rawline)) != (length($context_function) + 2)) {
6275                         WARN("EMBEDDED_FUNCTION_NAME",
6276                              "Prefer using '\"%s...\", __func__' to using '$context_function', this function's name, in a string\n" . $herecurr);
6277                 }
6278
6279 # check for unnecessary function tracing like uses
6280 # This does not use $logFunctions because there are many instances like
6281 # 'dprintk(FOO, "%s()\n", __func__);' which do not match $logFunctions
6282                 if ($rawline =~ /^\+.*\([^"]*"$tracing_logging_tags{0,3}%s(?:\s*\(\s*\)\s*)?$tracing_logging_tags{0,3}(?:\\n)?"\s*,\s*__func__\s*\)\s*;/) {
6283                         if (WARN("TRACING_LOGGING",
6284                                  "Unnecessary ftrace-like logging - prefer using ftrace\n" . $herecurr) &&
6285                             $fix) {
6286                                 fix_delete_line($fixlinenr, $rawline);
6287                         }
6288                 }
6289
6290 # check for spaces before a quoted newline
6291                 if ($rawline =~ /^.*\".*\s\\n/) {
6292                         if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
6293                                  "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
6294                             $fix) {
6295                                 $fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
6296                         }
6297
6298                 }
6299
6300 # concatenated string without spaces between elements
6301                 if ($line =~ /$String[A-Z_]/ ||
6302                     ($line =~ /([A-Za-z0-9_]+)$String/ && $1 !~ /^[Lu]$/)) {
6303                         if (CHK("CONCATENATED_STRING",
6304                                 "Concatenated strings should use spaces between elements\n" . $herecurr) &&
6305                             $fix) {
6306                                 while ($line =~ /($String)/g) {
6307                                         my $extracted_string = substr($rawline, $-[0], $+[0] - $-[0]);
6308                                         $fixed[$fixlinenr] =~ s/\Q$extracted_string\E([A-Za-z0-9_])/$extracted_string $1/;
6309                                         $fixed[$fixlinenr] =~ s/([A-Za-z0-9_])\Q$extracted_string\E/$1 $extracted_string/;
6310                                 }
6311                         }
6312                 }
6313
6314 # uncoalesced string fragments
6315                 if ($line =~ /$String\s*[Lu]?"/) {
6316                         if (WARN("STRING_FRAGMENTS",
6317                                  "Consecutive strings are generally better as a single string\n" . $herecurr) &&
6318                             $fix) {
6319                                 while ($line =~ /($String)(?=\s*")/g) {
6320                                         my $extracted_string = substr($rawline, $-[0], $+[0] - $-[0]);
6321                                         $fixed[$fixlinenr] =~ s/\Q$extracted_string\E\s*"/substr($extracted_string, 0, -1)/e;
6322                                 }
6323                         }
6324                 }
6325
6326 # check for non-standard and hex prefixed decimal printf formats
6327                 my $show_L = 1; #don't show the same defect twice
6328                 my $show_Z = 1;
6329                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
6330                         my $string = substr($rawline, $-[1], $+[1] - $-[1]);
6331                         $string =~ s/%%/__/g;
6332                         # check for %L
6333                         if ($show_L && $string =~ /%[\*\d\.\$]*L([diouxX])/) {
6334                                 WARN("PRINTF_L",
6335                                      "\%L$1 is non-standard C, use %ll$1\n" . $herecurr);
6336                                 $show_L = 0;
6337                         }
6338                         # check for %Z
6339                         if ($show_Z && $string =~ /%[\*\d\.\$]*Z([diouxX])/) {
6340                                 WARN("PRINTF_Z",
6341                                      "%Z$1 is non-standard C, use %z$1\n" . $herecurr);
6342                                 $show_Z = 0;
6343                         }
6344                         # check for 0x<decimal>
6345                         if ($string =~ /0x%[\*\d\.\$\Llzth]*[diou]/) {
6346                                 ERROR("PRINTF_0XDECIMAL",
6347                                       "Prefixing 0x with decimal output is defective\n" . $herecurr);
6348                         }
6349                 }
6350
6351 # check for line continuations in quoted strings with odd counts of "
6352                 if ($rawline =~ /\\$/ && $sline =~ tr/"/"/ % 2) {
6353                         WARN("LINE_CONTINUATIONS",
6354                              "Avoid line continuations in quoted strings\n" . $herecurr);
6355                 }
6356
6357 # warn about #if 0
6358                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
6359                         WARN("IF_0",
6360                              "Consider removing the code enclosed by this #if 0 and its #endif\n" . $herecurr);
6361                 }
6362
6363 # warn about #if 1
6364                 if ($line =~ /^.\s*\#\s*if\s+1\b/) {
6365                         WARN("IF_1",
6366                              "Consider removing the #if 1 and its #endif\n" . $herecurr);
6367                 }
6368
6369 # check for needless "if (<foo>) fn(<foo>)" uses
6370                 if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
6371                         my $tested = quotemeta($1);
6372                         my $expr = '\s*\(\s*' . $tested . '\s*\)\s*;';
6373                         if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?|(?:kmem_cache|mempool|dma_pool)_destroy)$expr/) {
6374                                 my $func = $1;
6375                                 if (WARN('NEEDLESS_IF',
6376                                          "$func(NULL) is safe and this check is probably not required\n" . $hereprev) &&
6377                                     $fix) {
6378                                         my $do_fix = 1;
6379                                         my $leading_tabs = "";
6380                                         my $new_leading_tabs = "";
6381                                         if ($lines[$linenr - 2] =~ /^\+(\t*)if\s*\(\s*$tested\s*\)\s*$/) {
6382                                                 $leading_tabs = $1;
6383                                         } else {
6384                                                 $do_fix = 0;
6385                                         }
6386                                         if ($lines[$linenr - 1] =~ /^\+(\t+)$func\s*\(\s*$tested\s*\)\s*;\s*$/) {
6387                                                 $new_leading_tabs = $1;
6388                                                 if (length($leading_tabs) + 1 ne length($new_leading_tabs)) {
6389                                                         $do_fix = 0;
6390                                                 }
6391                                         } else {
6392                                                 $do_fix = 0;
6393                                         }
6394                                         if ($do_fix) {
6395                                                 fix_delete_line($fixlinenr - 1, $prevrawline);
6396                                                 $fixed[$fixlinenr] =~ s/^\+$new_leading_tabs/\+$leading_tabs/;
6397                                         }
6398                                 }
6399                         }
6400                 }
6401
6402 # check for unnecessary "Out of Memory" messages
6403                 if ($line =~ /^\+.*\b$logFunctions\s*\(/ &&
6404                     $prevline =~ /^[ \+]\s*if\s*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ &&
6405                     (defined $1 || defined $3) &&
6406                     $linenr > 3) {
6407                         my $testval = $2;
6408                         my $testline = $lines[$linenr - 3];
6409
6410                         my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
6411 #                       print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n");
6412
6413                         if ($s =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*$allocFunctions\s*\(/ &&
6414                             $s !~ /\b__GFP_NOWARN\b/ ) {
6415                                 WARN("OOM_MESSAGE",
6416                                      "Possible unnecessary 'out of memory' message\n" . $hereprev);
6417                         }
6418                 }
6419
6420 # check for logging functions with KERN_<LEVEL>
6421                 if ($line !~ /printk(?:_ratelimited|_once)?\s*\(/ &&
6422                     $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) {
6423                         my $level = $1;
6424                         if (WARN("UNNECESSARY_KERN_LEVEL",
6425                                  "Possible unnecessary $level\n" . $herecurr) &&
6426                             $fix) {
6427                                 $fixed[$fixlinenr] =~ s/\s*$level\s*//;
6428                         }
6429                 }
6430
6431 # check for logging continuations
6432                 if ($line =~ /\bprintk\s*\(\s*KERN_CONT\b|\bpr_cont\s*\(/) {
6433                         WARN("LOGGING_CONTINUATION",
6434                              "Avoid logging continuation uses where feasible\n" . $herecurr);
6435                 }
6436
6437 # check for unnecessary use of %h[xudi] and %hh[xudi] in logging functions
6438                 if (defined $stat &&
6439                     $line =~ /\b$logFunctions\s*\(/ &&
6440                     index($stat, '"') >= 0) {
6441                         my $lc = $stat =~ tr@\n@@;
6442                         $lc = $lc + $linenr;
6443                         my $stat_real = get_stat_real($linenr, $lc);
6444                         pos($stat_real) = index($stat_real, '"');
6445                         while ($stat_real =~ /[^\"%]*(%[\#\d\.\*\-]*(h+)[idux])/g) {
6446                                 my $pspec = $1;
6447                                 my $h = $2;
6448                                 my $lineoff = substr($stat_real, 0, $-[1]) =~ tr@\n@@;
6449                                 if (WARN("UNNECESSARY_MODIFIER",
6450                                          "Integer promotion: Using '$h' in '$pspec' is unnecessary\n" . "$here\n$stat_real\n") &&
6451                                     $fix && $fixed[$fixlinenr + $lineoff] =~ /^\+/) {
6452                                         my $nspec = $pspec;
6453                                         $nspec =~ s/h//g;
6454                                         $fixed[$fixlinenr + $lineoff] =~ s/\Q$pspec\E/$nspec/;
6455                                 }
6456                         }
6457                 }
6458
6459 # check for mask then right shift without a parentheses
6460                 if ($perl_version_ok &&
6461                     $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ &&
6462                     $4 !~ /^\&/) { # $LvalOrFunc may be &foo, ignore if so
6463                         WARN("MASK_THEN_SHIFT",
6464                              "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr);
6465                 }
6466
6467 # check for pointer comparisons to NULL
6468                 if ($perl_version_ok) {
6469                         while ($line =~ /\b$LvalOrFunc\s*(==|\!=)\s*NULL\b/g) {
6470                                 my $val = $1;
6471                                 my $equal = "!";
6472                                 $equal = "" if ($4 eq "!=");
6473                                 if (CHK("COMPARISON_TO_NULL",
6474                                         "Comparison to NULL could be written \"${equal}${val}\"\n" . $herecurr) &&
6475                                             $fix) {
6476                                         $fixed[$fixlinenr] =~ s/\b\Q$val\E\s*(?:==|\!=)\s*NULL\b/$equal$val/;
6477                                 }
6478                         }
6479                 }
6480
6481 # check for bad placement of section $InitAttribute (e.g.: __initdata)
6482                 if ($line =~ /(\b$InitAttribute\b)/) {
6483                         my $attr = $1;
6484                         if ($line =~ /^\+\s*static\s+(?:const\s+)?(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*[=;]/) {
6485                                 my $ptr = $1;
6486                                 my $var = $2;
6487                                 if ((($ptr =~ /\b(union|struct)\s+$attr\b/ &&
6488                                       ERROR("MISPLACED_INIT",
6489                                             "$attr should be placed after $var\n" . $herecurr)) ||
6490                                      ($ptr !~ /\b(union|struct)\s+$attr\b/ &&
6491                                       WARN("MISPLACED_INIT",
6492                                            "$attr should be placed after $var\n" . $herecurr))) &&
6493                                     $fix) {
6494                                         $fixed[$fixlinenr] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e;
6495                                 }
6496                         }
6497                 }
6498
6499 # check for $InitAttributeData (ie: __initdata) with const
6500                 if ($line =~ /\bconst\b/ && $line =~ /($InitAttributeData)/) {
6501                         my $attr = $1;
6502                         $attr =~ /($InitAttributePrefix)(.*)/;
6503                         my $attr_prefix = $1;
6504                         my $attr_type = $2;
6505                         if (ERROR("INIT_ATTRIBUTE",
6506                                   "Use of const init definition must use ${attr_prefix}initconst\n" . $herecurr) &&
6507                             $fix) {
6508                                 $fixed[$fixlinenr] =~
6509                                     s/$InitAttributeData/${attr_prefix}initconst/;
6510                         }
6511                 }
6512
6513 # check for $InitAttributeConst (ie: __initconst) without const
6514                 if ($line !~ /\bconst\b/ && $line =~ /($InitAttributeConst)/) {
6515                         my $attr = $1;
6516                         if (ERROR("INIT_ATTRIBUTE",
6517                                   "Use of $attr requires a separate use of const\n" . $herecurr) &&
6518                             $fix) {
6519                                 my $lead = $fixed[$fixlinenr] =~
6520                                     /(^\+\s*(?:static\s+))/;
6521                                 $lead = rtrim($1);
6522                                 $lead = "$lead " if ($lead !~ /^\+$/);
6523                                 $lead = "${lead}const ";
6524                                 $fixed[$fixlinenr] =~ s/(^\+\s*(?:static\s+))/$lead/;
6525                         }
6526                 }
6527
6528 # check for __read_mostly with const non-pointer (should just be const)
6529                 if ($line =~ /\b__read_mostly\b/ &&
6530                     $line =~ /($Type)\s*$Ident/ && $1 !~ /\*\s*$/ && $1 =~ /\bconst\b/) {
6531                         if (ERROR("CONST_READ_MOSTLY",
6532                                   "Invalid use of __read_mostly with const type\n" . $herecurr) &&
6533                             $fix) {
6534                                 $fixed[$fixlinenr] =~ s/\s+__read_mostly\b//;
6535                         }
6536                 }
6537
6538 # don't use __constant_<foo> functions outside of include/uapi/
6539                 if ($realfile !~ m@^include/uapi/@ &&
6540                     $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {
6541                         my $constant_func = $1;
6542                         my $func = $constant_func;
6543                         $func =~ s/^__constant_//;
6544                         if (WARN("CONSTANT_CONVERSION",
6545                                  "$constant_func should be $func\n" . $herecurr) &&
6546                             $fix) {
6547                                 $fixed[$fixlinenr] =~ s/\b$constant_func\b/$func/g;
6548                         }
6549                 }
6550
6551 # prefer usleep_range over udelay
6552                 if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
6553                         my $delay = $1;
6554                         # ignore udelay's < 10, however
6555                         if (! ($delay < 10) ) {
6556                                 CHK("USLEEP_RANGE",
6557                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.rst\n" . $herecurr);
6558                         }
6559                         if ($delay > 2000) {
6560                                 WARN("LONG_UDELAY",
6561                                      "long udelay - prefer mdelay; see arch/arm/include/asm/delay.h\n" . $herecurr);
6562                         }
6563                 }
6564
6565 # warn about unexpectedly long msleep's
6566                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
6567                         if ($1 < 20) {
6568                                 WARN("MSLEEP",
6569                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.rst\n" . $herecurr);
6570                         }
6571                 }
6572
6573 # check for comparisons of jiffies
6574                 if ($line =~ /\bjiffies\s*$Compare|$Compare\s*jiffies\b/) {
6575                         WARN("JIFFIES_COMPARISON",
6576                              "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
6577                 }
6578
6579 # check for comparisons of get_jiffies_64()
6580                 if ($line =~ /\bget_jiffies_64\s*\(\s*\)\s*$Compare|$Compare\s*get_jiffies_64\s*\(\s*\)/) {
6581                         WARN("JIFFIES_COMPARISON",
6582                              "Comparing get_jiffies_64() is almost always wrong; prefer time_after64, time_before64 and friends\n" . $herecurr);
6583                 }
6584
6585 # warn about #ifdefs in C files
6586 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
6587 #                       print "#ifdef in C files should be avoided\n";
6588 #                       print "$herecurr";
6589 #                       $clean = 0;
6590 #               }
6591
6592 # warn about spacing in #ifdefs
6593                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
6594                         if (ERROR("SPACING",
6595                                   "exactly one space required after that #$1\n" . $herecurr) &&
6596                             $fix) {
6597                                 $fixed[$fixlinenr] =~
6598                                     s/^(.\s*\#\s*(ifdef|ifndef|elif))\s{2,}/$1 /;
6599                         }
6600
6601                 }
6602
6603 # check for spinlock_t definitions without a comment.
6604                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
6605                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
6606                         my $which = $1;
6607                         if (!ctx_has_comment($first_line, $linenr)) {
6608                                 CHK("UNCOMMENTED_DEFINITION",
6609                                     "$1 definition without comment\n" . $herecurr);
6610                         }
6611                 }
6612 # check for memory barriers without a comment.
6613
6614                 my $barriers = qr{
6615                         mb|
6616                         rmb|
6617                         wmb
6618                 }x;
6619                 my $barrier_stems = qr{
6620                         mb__before_atomic|
6621                         mb__after_atomic|
6622                         store_release|
6623                         load_acquire|
6624                         store_mb|
6625                         (?:$barriers)
6626                 }x;
6627                 my $all_barriers = qr{
6628                         (?:$barriers)|
6629                         smp_(?:$barrier_stems)|
6630                         virt_(?:$barrier_stems)
6631                 }x;
6632
6633                 if ($line =~ /\b(?:$all_barriers)\s*\(/) {
6634                         if (!ctx_has_comment($first_line, $linenr)) {
6635                                 WARN("MEMORY_BARRIER",
6636                                      "memory barrier without comment\n" . $herecurr);
6637                         }
6638                 }
6639
6640                 my $underscore_smp_barriers = qr{__smp_(?:$barrier_stems)}x;
6641
6642                 if ($realfile !~ m@^include/asm-generic/@ &&
6643                     $realfile !~ m@/barrier\.h$@ &&
6644                     $line =~ m/\b(?:$underscore_smp_barriers)\s*\(/ &&
6645                     $line !~ m/^.\s*\#\s*define\s+(?:$underscore_smp_barriers)\s*\(/) {
6646                         WARN("MEMORY_BARRIER",
6647                              "__smp memory barriers shouldn't be used outside barrier.h and asm-generic\n" . $herecurr);
6648                 }
6649
6650 # check for waitqueue_active without a comment.
6651                 if ($line =~ /\bwaitqueue_active\s*\(/) {
6652                         if (!ctx_has_comment($first_line, $linenr)) {
6653                                 WARN("WAITQUEUE_ACTIVE",
6654                                      "waitqueue_active without comment\n" . $herecurr);
6655                         }
6656                 }
6657
6658 # check for data_race without a comment.
6659                 if ($line =~ /\bdata_race\s*\(/) {
6660                         if (!ctx_has_comment($first_line, $linenr)) {
6661                                 WARN("DATA_RACE",
6662                                      "data_race without comment\n" . $herecurr);
6663                         }
6664                 }
6665
6666 # check of hardware specific defines
6667                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
6668                         CHK("ARCH_DEFINES",
6669                             "architecture specific defines should be avoided\n" .  $herecurr);
6670                 }
6671
6672 # check that the storage class is not after a type
6673                 if ($line =~ /\b($Type)\s+($Storage)\b/) {
6674                         WARN("STORAGE_CLASS",
6675                              "storage class '$2' should be located before type '$1'\n" . $herecurr);
6676                 }
6677 # Check that the storage class is at the beginning of a declaration
6678                 if ($line =~ /\b$Storage\b/ &&
6679                     $line !~ /^.\s*$Storage/ &&
6680                     $line =~ /^.\s*(.+?)\$Storage\s/ &&
6681                     $1 !~ /[\,\)]\s*$/) {
6682                         WARN("STORAGE_CLASS",
6683                              "storage class should be at the beginning of the declaration\n" . $herecurr);
6684                 }
6685
6686 # check the location of the inline attribute, that it is between
6687 # storage class and type.
6688                 if ($line =~ /\b$Type\s+$Inline\b/ ||
6689                     $line =~ /\b$Inline\s+$Storage\b/) {
6690                         ERROR("INLINE_LOCATION",
6691                               "inline keyword should sit between storage class and type\n" . $herecurr);
6692                 }
6693
6694 # Check for __inline__ and __inline, prefer inline
6695                 if ($realfile !~ m@\binclude/uapi/@ &&
6696                     $line =~ /\b(__inline__|__inline)\b/) {
6697                         if (WARN("INLINE",
6698                                  "plain inline is preferred over $1\n" . $herecurr) &&
6699                             $fix) {
6700                                 $fixed[$fixlinenr] =~ s/\b(__inline__|__inline)\b/inline/;
6701
6702                         }
6703                 }
6704
6705 # Check for compiler attributes
6706                 if ($realfile !~ m@\binclude/uapi/@ &&
6707                     $rawline =~ /\b__attribute__\s*\(\s*($balanced_parens)\s*\)/) {
6708                         my $attr = $1;
6709                         $attr =~ s/\s*\(\s*(.*)\)\s*/$1/;
6710
6711                         my %attr_list = (
6712                                 "alias"                         => "__alias",
6713                                 "aligned"                       => "__aligned",
6714                                 "always_inline"                 => "__always_inline",
6715                                 "assume_aligned"                => "__assume_aligned",
6716                                 "cold"                          => "__cold",
6717                                 "const"                         => "__attribute_const__",
6718                                 "copy"                          => "__copy",
6719                                 "designated_init"               => "__designated_init",
6720                                 "externally_visible"            => "__visible",
6721                                 "format"                        => "printf|scanf",
6722                                 "gnu_inline"                    => "__gnu_inline",
6723                                 "malloc"                        => "__malloc",
6724                                 "mode"                          => "__mode",
6725                                 "no_caller_saved_registers"     => "__no_caller_saved_registers",
6726                                 "noclone"                       => "__noclone",
6727                                 "noinline"                      => "noinline",
6728                                 "nonstring"                     => "__nonstring",
6729                                 "noreturn"                      => "__noreturn",
6730                                 "packed"                        => "__packed",
6731                                 "pure"                          => "__pure",
6732                                 "section"                       => "__section",
6733                                 "used"                          => "__used",
6734                                 "weak"                          => "__weak"
6735                         );
6736
6737                         while ($attr =~ /\s*(\w+)\s*(${balanced_parens})?/g) {
6738                                 my $orig_attr = $1;
6739                                 my $params = '';
6740                                 $params = $2 if defined($2);
6741                                 my $curr_attr = $orig_attr;
6742                                 $curr_attr =~ s/^[\s_]+|[\s_]+$//g;
6743                                 if (exists($attr_list{$curr_attr})) {
6744                                         my $new = $attr_list{$curr_attr};
6745                                         if ($curr_attr eq "format" && $params) {
6746                                                 $params =~ /^\s*\(\s*(\w+)\s*,\s*(.*)/;
6747                                                 $new = "__$1\($2";
6748                                         } else {
6749                                                 $new = "$new$params";
6750                                         }
6751                                         if (WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
6752                                                  "Prefer $new over __attribute__(($orig_attr$params))\n" . $herecurr) &&
6753                                             $fix) {
6754                                                 my $remove = "\Q$orig_attr\E" . '\s*' . "\Q$params\E" . '(?:\s*,\s*)?';
6755                                                 $fixed[$fixlinenr] =~ s/$remove//;
6756                                                 $fixed[$fixlinenr] =~ s/\b__attribute__/$new __attribute__/;
6757                                                 $fixed[$fixlinenr] =~ s/\}\Q$new\E/} $new/;
6758                                                 $fixed[$fixlinenr] =~ s/ __attribute__\s*\(\s*\(\s*\)\s*\)//;
6759                                         }
6760                                 }
6761                         }
6762
6763                         # Check for __attribute__ unused, prefer __always_unused or __maybe_unused
6764                         if ($attr =~ /^_*unused/) {
6765                                 WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
6766                                      "__always_unused or __maybe_unused is preferred over __attribute__((__unused__))\n" . $herecurr);
6767                         }
6768                 }
6769
6770 # Check for __attribute__ weak, or __weak declarations (may have link issues)
6771                 if ($perl_version_ok &&
6772                     $line =~ /(?:$Declare|$DeclareMisordered)\s*$Ident\s*$balanced_parens\s*(?:$Attribute)?\s*;/ &&
6773                     ($line =~ /\b__attribute__\s*\(\s*\(.*\bweak\b/ ||
6774                      $line =~ /\b__weak\b/)) {
6775                         ERROR("WEAK_DECLARATION",
6776                               "Using weak declarations can have unintended link defects\n" . $herecurr);
6777                 }
6778
6779 # check for c99 types like uint8_t used outside of uapi/ and tools/
6780                 if ($realfile !~ m@\binclude/uapi/@ &&
6781                     $realfile !~ m@\btools/@ &&
6782                     $line =~ /\b($Declare)\s*$Ident\s*[=;,\[]/) {
6783                         my $type = $1;
6784                         if ($type =~ /\b($typeC99Typedefs)\b/) {
6785                                 $type = $1;
6786                                 my $kernel_type = 'u';
6787                                 $kernel_type = 's' if ($type =~ /^_*[si]/);
6788                                 $type =~ /(\d+)/;
6789                                 $kernel_type .= $1;
6790                                 if (CHK("PREFER_KERNEL_TYPES",
6791                                         "Prefer kernel type '$kernel_type' over '$type'\n" . $herecurr) &&
6792                                     $fix) {
6793                                         $fixed[$fixlinenr] =~ s/\b$type\b/$kernel_type/;
6794                                 }
6795                         }
6796                 }
6797
6798 # check for cast of C90 native int or longer types constants
6799                 if ($line =~ /(\(\s*$C90_int_types\s*\)\s*)($Constant)\b/) {
6800                         my $cast = $1;
6801                         my $const = $2;
6802                         my $suffix = "";
6803                         my $newconst = $const;
6804                         $newconst =~ s/${Int_type}$//;
6805                         $suffix .= 'U' if ($cast =~ /\bunsigned\b/);
6806                         if ($cast =~ /\blong\s+long\b/) {
6807                             $suffix .= 'LL';
6808                         } elsif ($cast =~ /\blong\b/) {
6809                             $suffix .= 'L';
6810                         }
6811                         if (WARN("TYPECAST_INT_CONSTANT",
6812                                  "Unnecessary typecast of c90 int constant - '$cast$const' could be '$const$suffix'\n" . $herecurr) &&
6813                             $fix) {
6814                                 $fixed[$fixlinenr] =~ s/\Q$cast\E$const\b/$newconst$suffix/;
6815                         }
6816                 }
6817
6818 # check for sizeof(&)
6819                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
6820                         WARN("SIZEOF_ADDRESS",
6821                              "sizeof(& should be avoided\n" . $herecurr);
6822                 }
6823
6824 # check for sizeof without parenthesis
6825                 if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
6826                         if (WARN("SIZEOF_PARENTHESIS",
6827                                  "sizeof $1 should be sizeof($1)\n" . $herecurr) &&
6828                             $fix) {
6829                                 $fixed[$fixlinenr] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex;
6830                         }
6831                 }
6832
6833 # check for struct spinlock declarations
6834                 if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
6835                         WARN("USE_SPINLOCK_T",
6836                              "struct spinlock should be spinlock_t\n" . $herecurr);
6837                 }
6838
6839 # check for seq_printf uses that could be seq_puts
6840                 if ($sline =~ /\bseq_printf\s*\(.*"\s*\)\s*;\s*$/) {
6841                         my $fmt = get_quoted_string($line, $rawline);
6842                         $fmt =~ s/%%//g;
6843                         if ($fmt !~ /%/) {
6844                                 if (WARN("PREFER_SEQ_PUTS",
6845                                          "Prefer seq_puts to seq_printf\n" . $herecurr) &&
6846                                     $fix) {
6847                                         $fixed[$fixlinenr] =~ s/\bseq_printf\b/seq_puts/;
6848                                 }
6849                         }
6850                 }
6851
6852 # check for vsprintf extension %p<foo> misuses
6853                 if ($perl_version_ok &&
6854                     defined $stat &&
6855                     $stat =~ /^\+(?![^\{]*\{\s*).*\b(\w+)\s*\(.*$String\s*,/s &&
6856                     $1 !~ /^_*volatile_*$/) {
6857                         my $stat_real;
6858
6859                         my $lc = $stat =~ tr@\n@@;
6860                         $lc = $lc + $linenr;
6861                         for (my $count = $linenr; $count <= $lc; $count++) {
6862                                 my $specifier;
6863                                 my $extension;
6864                                 my $qualifier;
6865                                 my $bad_specifier = "";
6866                                 my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0));
6867                                 $fmt =~ s/%%//g;
6868
6869                                 while ($fmt =~ /(\%[\*\d\.]*p(\w)(\w*))/g) {
6870                                         $specifier = $1;
6871                                         $extension = $2;
6872                                         $qualifier = $3;
6873                                         if ($extension !~ /[4SsBKRraEehMmIiUDdgVCbGNOxtf]/ ||
6874                                             ($extension eq "f" &&
6875                                              defined $qualifier && $qualifier !~ /^w/) ||
6876                                             ($extension eq "4" &&
6877                                              defined $qualifier && $qualifier !~ /^cc/)) {
6878                                                 $bad_specifier = $specifier;
6879                                                 last;
6880                                         }
6881                                         if ($extension eq "x" && !defined($stat_real)) {
6882                                                 if (!defined($stat_real)) {
6883                                                         $stat_real = get_stat_real($linenr, $lc);
6884                                                 }
6885                                                 WARN("VSPRINTF_SPECIFIER_PX",
6886                                                      "Using vsprintf specifier '\%px' potentially exposes the kernel memory layout, if you don't really need the address please consider using '\%p'.\n" . "$here\n$stat_real\n");
6887                                         }
6888                                 }
6889                                 if ($bad_specifier ne "") {
6890                                         my $stat_real = get_stat_real($linenr, $lc);
6891                                         my $ext_type = "Invalid";
6892                                         my $use = "";
6893                                         if ($bad_specifier =~ /p[Ff]/) {
6894                                                 $use = " - use %pS instead";
6895                                                 $use =~ s/pS/ps/ if ($bad_specifier =~ /pf/);
6896                                         }
6897
6898                                         WARN("VSPRINTF_POINTER_EXTENSION",
6899                                              "$ext_type vsprintf pointer extension '$bad_specifier'$use\n" . "$here\n$stat_real\n");
6900                                 }
6901                         }
6902                 }
6903
6904 # Check for misused memsets
6905                 if ($perl_version_ok &&
6906                     defined $stat &&
6907                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/) {
6908
6909                         my $ms_addr = $2;
6910                         my $ms_val = $7;
6911                         my $ms_size = $12;
6912
6913                         if ($ms_size =~ /^(0x|)0$/i) {
6914                                 ERROR("MEMSET",
6915                                       "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
6916                         } elsif ($ms_size =~ /^(0x|)1$/i) {
6917                                 WARN("MEMSET",
6918                                      "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
6919                         }
6920                 }
6921
6922 # Check for memcpy(foo, bar, ETH_ALEN) that could be ether_addr_copy(foo, bar)
6923 #               if ($perl_version_ok &&
6924 #                   defined $stat &&
6925 #                   $stat =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
6926 #                       if (WARN("PREFER_ETHER_ADDR_COPY",
6927 #                                "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . "$here\n$stat\n") &&
6928 #                           $fix) {
6929 #                               $fixed[$fixlinenr] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/;
6930 #                       }
6931 #               }
6932
6933 # Check for memcmp(foo, bar, ETH_ALEN) that could be ether_addr_equal*(foo, bar)
6934 #               if ($perl_version_ok &&
6935 #                   defined $stat &&
6936 #                   $stat =~ /^\+(?:.*?)\bmemcmp\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
6937 #                       WARN("PREFER_ETHER_ADDR_EQUAL",
6938 #                            "Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()\n" . "$here\n$stat\n")
6939 #               }
6940
6941 # check for memset(foo, 0x0, ETH_ALEN) that could be eth_zero_addr
6942 # check for memset(foo, 0xFF, ETH_ALEN) that could be eth_broadcast_addr
6943 #               if ($perl_version_ok &&
6944 #                   defined $stat &&
6945 #                   $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
6946 #
6947 #                       my $ms_val = $7;
6948 #
6949 #                       if ($ms_val =~ /^(?:0x|)0+$/i) {
6950 #                               if (WARN("PREFER_ETH_ZERO_ADDR",
6951 #                                        "Prefer eth_zero_addr over memset()\n" . "$here\n$stat\n") &&
6952 #                                   $fix) {
6953 #                                       $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_zero_addr($2)/;
6954 #                               }
6955 #                       } elsif ($ms_val =~ /^(?:0xff|255)$/i) {
6956 #                               if (WARN("PREFER_ETH_BROADCAST_ADDR",
6957 #                                        "Prefer eth_broadcast_addr() over memset()\n" . "$here\n$stat\n") &&
6958 #                                   $fix) {
6959 #                                       $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_broadcast_addr($2)/;
6960 #                               }
6961 #                       }
6962 #               }
6963
6964 # typecasts on min/max could be min_t/max_t
6965                 if ($perl_version_ok &&
6966                     defined $stat &&
6967                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
6968                         if (defined $2 || defined $7) {
6969                                 my $call = $1;
6970                                 my $cast1 = deparenthesize($2);
6971                                 my $arg1 = $3;
6972                                 my $cast2 = deparenthesize($7);
6973                                 my $arg2 = $8;
6974                                 my $cast;
6975
6976                                 if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
6977                                         $cast = "$cast1 or $cast2";
6978                                 } elsif ($cast1 ne "") {
6979                                         $cast = $cast1;
6980                                 } else {
6981                                         $cast = $cast2;
6982                                 }
6983                                 WARN("MINMAX",
6984                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
6985                         }
6986                 }
6987
6988 # check usleep_range arguments
6989                 if ($perl_version_ok &&
6990                     defined $stat &&
6991                     $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
6992                         my $min = $1;
6993                         my $max = $7;
6994                         if ($min eq $max) {
6995                                 WARN("USLEEP_RANGE",
6996                                      "usleep_range should not use min == max args; see Documentation/timers/timers-howto.rst\n" . "$here\n$stat\n");
6997                         } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
6998                                  $min > $max) {
6999                                 WARN("USLEEP_RANGE",
7000                                      "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.rst\n" . "$here\n$stat\n");
7001                         }
7002                 }
7003
7004 # check for naked sscanf
7005                 if ($perl_version_ok &&
7006                     defined $stat &&
7007                     $line =~ /\bsscanf\b/ &&
7008                     ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ &&
7009                      $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ &&
7010                      $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) {
7011                         my $lc = $stat =~ tr@\n@@;
7012                         $lc = $lc + $linenr;
7013                         my $stat_real = get_stat_real($linenr, $lc);
7014                         WARN("NAKED_SSCANF",
7015                              "unchecked sscanf return value\n" . "$here\n$stat_real\n");
7016                 }
7017
7018 # check for simple sscanf that should be kstrto<foo>
7019                 if ($perl_version_ok &&
7020                     defined $stat &&
7021                     $line =~ /\bsscanf\b/) {
7022                         my $lc = $stat =~ tr@\n@@;
7023                         $lc = $lc + $linenr;
7024                         my $stat_real = get_stat_real($linenr, $lc);
7025                         if ($stat_real =~ /\bsscanf\b\s*\(\s*$FuncArg\s*,\s*("[^"]+")/) {
7026                                 my $format = $6;
7027                                 my $count = $format =~ tr@%@%@;
7028                                 if ($count == 1 &&
7029                                     $format =~ /^"\%(?i:ll[udxi]|[udxi]ll|ll|[hl]h?[udxi]|[udxi][hl]h?|[hl]h?|[udxi])"$/) {
7030                                         WARN("SSCANF_TO_KSTRTO",
7031                                              "Prefer kstrto<type> to single variable sscanf\n" . "$here\n$stat_real\n");
7032                                 }
7033                         }
7034                 }
7035
7036 # check for new externs in .h files.
7037                 if ($realfile =~ /\.h$/ &&
7038                     $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) {
7039                         if (CHK("AVOID_EXTERNS",
7040                                 "extern prototypes should be avoided in .h files\n" . $herecurr) &&
7041                             $fix) {
7042                                 $fixed[$fixlinenr] =~ s/(.*)\bextern\b\s*(.*)/$1$2/;
7043                         }
7044                 }
7045
7046 # check for new externs in .c files.
7047                 if ($realfile =~ /\.c$/ && defined $stat &&
7048                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
7049                 {
7050                         my $function_name = $1;
7051                         my $paren_space = $2;
7052
7053                         my $s = $stat;
7054                         if (defined $cond) {
7055                                 substr($s, 0, length($cond), '');
7056                         }
7057                         if ($s =~ /^\s*;/)
7058                         {
7059                                 WARN("AVOID_EXTERNS",
7060                                      "externs should be avoided in .c files\n" .  $herecurr);
7061                         }
7062
7063                         if ($paren_space =~ /\n/) {
7064                                 WARN("FUNCTION_ARGUMENTS",
7065                                      "arguments for function declarations should follow identifier\n" . $herecurr);
7066                         }
7067
7068                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
7069                     $stat =~ /^.\s*extern\s+/)
7070                 {
7071                         WARN("AVOID_EXTERNS",
7072                              "externs should be avoided in .c files\n" .  $herecurr);
7073                 }
7074
7075 # check for function declarations that have arguments without identifier names
7076                 if (defined $stat &&
7077                     $stat =~ /^.\s*(?:extern\s+)?$Type\s*(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*\(\s*([^{]+)\s*\)\s*;/s &&
7078                     $1 ne "void") {
7079                         my $args = trim($1);
7080                         while ($args =~ m/\s*($Type\s*(?:$Ident|\(\s*\*\s*$Ident?\s*\)\s*$balanced_parens)?)/g) {
7081                                 my $arg = trim($1);
7082                                 if ($arg =~ /^$Type$/ && $arg !~ /enum\s+$Ident$/) {
7083                                         WARN("FUNCTION_ARGUMENTS",
7084                                              "function definition argument '$arg' should also have an identifier name\n" . $herecurr);
7085                                 }
7086                         }
7087                 }
7088
7089 # check for function definitions
7090                 if ($perl_version_ok &&
7091                     defined $stat &&
7092                     $stat =~ /^.\s*(?:$Storage\s+)?$Type\s*($Ident)\s*$balanced_parens\s*{/s) {
7093                         $context_function = $1;
7094
7095 # check for multiline function definition with misplaced open brace
7096                         my $ok = 0;
7097                         my $cnt = statement_rawlines($stat);
7098                         my $herectx = $here . "\n";
7099                         for (my $n = 0; $n < $cnt; $n++) {
7100                                 my $rl = raw_line($linenr, $n);
7101                                 $herectx .=  $rl . "\n";
7102                                 $ok = 1 if ($rl =~ /^[ \+]\{/);
7103                                 $ok = 1 if ($rl =~ /\{/ && $n == 0);
7104                                 last if $rl =~ /^[ \+].*\{/;
7105                         }
7106                         if (!$ok) {
7107                                 ERROR("OPEN_BRACE",
7108                                       "open brace '{' following function definitions go on the next line\n" . $herectx);
7109                         }
7110                 }
7111
7112 # checks for new __setup's
7113                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
7114                         my $name = $1;
7115
7116                         if (!grep(/$name/, @setup_docs)) {
7117                                 CHK("UNDOCUMENTED_SETUP",
7118                                     "__setup appears un-documented -- check Documentation/admin-guide/kernel-parameters.txt\n" . $herecurr);
7119                         }
7120                 }
7121
7122 # check for pointless casting of alloc functions
7123                 if ($line =~ /\*\s*\)\s*$allocFunctions\b/) {
7124                         WARN("UNNECESSARY_CASTS",
7125                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
7126                 }
7127
7128 # alloc style
7129 # p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
7130                 if ($perl_version_ok &&
7131                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k|v)[mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
7132                         CHK("ALLOC_SIZEOF_STRUCT",
7133                             "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
7134                 }
7135
7136 # check for k[mz]alloc with multiplies that could be kmalloc_array/kcalloc
7137                 if ($perl_version_ok &&
7138                     defined $stat &&
7139                     $stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
7140                         my $oldfunc = $3;
7141                         my $a1 = $4;
7142                         my $a2 = $10;
7143                         my $newfunc = "kmalloc_array";
7144                         $newfunc = "kcalloc" if ($oldfunc eq "kzalloc");
7145                         my $r1 = $a1;
7146                         my $r2 = $a2;
7147                         if ($a1 =~ /^sizeof\s*\S/) {
7148                                 $r1 = $a2;
7149                                 $r2 = $a1;
7150                         }
7151                         if ($r1 !~ /^sizeof\b/ && $r2 =~ /^sizeof\s*\S/ &&
7152                             !($r1 =~ /^$Constant$/ || $r1 =~ /^[A-Z_][A-Z0-9_]*$/)) {
7153                                 my $cnt = statement_rawlines($stat);
7154                                 my $herectx = get_stat_here($linenr, $cnt, $here);
7155
7156                                 if (WARN("ALLOC_WITH_MULTIPLY",
7157                                          "Prefer $newfunc over $oldfunc with multiply\n" . $herectx) &&
7158                                     $cnt == 1 &&
7159                                     $fix) {
7160                                         $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
7161                                 }
7162                         }
7163                 }
7164
7165 # check for krealloc arg reuse
7166                 if ($perl_version_ok &&
7167                     $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*($Lval)\s*,/ &&
7168                     $1 eq $3) {
7169                         WARN("KREALLOC_ARG_REUSE",
7170                              "Reusing the krealloc arg is almost always a bug\n" . $herecurr);
7171                 }
7172
7173 # check for alloc argument mismatch
7174                 if ($line =~ /\b((?:devm_)?(?:kcalloc|kmalloc_array))\s*\(\s*sizeof\b/) {
7175                         WARN("ALLOC_ARRAY_ARGS",
7176                              "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
7177                 }
7178
7179 # check for multiple semicolons
7180                 if ($line =~ /;\s*;\s*$/) {
7181                         if (WARN("ONE_SEMICOLON",
7182                                  "Statements terminations use 1 semicolon\n" . $herecurr) &&
7183                             $fix) {
7184                                 $fixed[$fixlinenr] =~ s/(\s*;\s*){2,}$/;/g;
7185                         }
7186                 }
7187
7188 # check for #defines like: 1 << <digit> that could be BIT(digit), it is not exported to uapi
7189                 if ($realfile !~ m@^include/uapi/@ &&
7190                     $line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
7191                         my $ull = "";
7192                         $ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
7193                         if (CHK("BIT_MACRO",
7194                                 "Prefer using the BIT$ull macro\n" . $herecurr) &&
7195                             $fix) {
7196                                 $fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
7197                         }
7198                 }
7199
7200 # check for IS_ENABLED() without CONFIG_<FOO> ($rawline for comments too)
7201                 if ($rawline =~ /\bIS_ENABLED\s*\(\s*(\w+)\s*\)/ && $1 !~ /^${CONFIG_}/) {
7202                         WARN("IS_ENABLED_CONFIG",
7203                              "IS_ENABLED($1) is normally used as IS_ENABLED(${CONFIG_}$1)\n" . $herecurr);
7204                 }
7205
7206 # check for #if defined CONFIG_<FOO> || defined CONFIG_<FOO>_MODULE
7207                 if ($line =~ /^\+\s*#\s*if\s+defined(?:\s*\(?\s*|\s+)(${CONFIG_}[A-Z_]+)\s*\)?\s*\|\|\s*defined(?:\s*\(?\s*|\s+)\1_MODULE\s*\)?\s*$/) {
7208                         my $config = $1;
7209                         if (WARN("PREFER_IS_ENABLED",
7210                                  "Prefer IS_ENABLED(<FOO>) to ${CONFIG_}<FOO> || ${CONFIG_}<FOO>_MODULE\n" . $herecurr) &&
7211                             $fix) {
7212                                 $fixed[$fixlinenr] = "\+#if IS_ENABLED($config)";
7213                         }
7214                 }
7215
7216 # check for /* fallthrough */ like comment, prefer fallthrough;
7217                 my @fallthroughs = (
7218                         'fallthrough',
7219                         '@fallthrough@',
7220                         'lint -fallthrough[ \t]*',
7221                         'intentional(?:ly)?[ \t]*fall(?:(?:s | |-)[Tt]|t)hr(?:ough|u|ew)',
7222                         '(?:else,?\s*)?FALL(?:S | |-)?THR(?:OUGH|U|EW)[ \t.!]*(?:-[^\n\r]*)?',
7223                         'Fall(?:(?:s | |-)[Tt]|t)hr(?:ough|u|ew)[ \t.!]*(?:-[^\n\r]*)?',
7224                         'fall(?:s | |-)?thr(?:ough|u|ew)[ \t.!]*(?:-[^\n\r]*)?',
7225                     );
7226                 if ($raw_comment ne '') {
7227                         foreach my $ft (@fallthroughs) {
7228                                 if ($raw_comment =~ /$ft/) {
7229                                         my $msg_level = \&WARN;
7230                                         $msg_level = \&CHK if ($file);
7231                                         &{$msg_level}("PREFER_FALLTHROUGH",
7232                                                       "Prefer 'fallthrough;' over fallthrough comment\n" . $herecurr);
7233                                         last;
7234                                 }
7235                         }
7236                 }
7237
7238 # check for switch/default statements without a break;
7239                 if ($perl_version_ok &&
7240                     defined $stat &&
7241                     $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
7242                         my $cnt = statement_rawlines($stat);
7243                         my $herectx = get_stat_here($linenr, $cnt, $here);
7244
7245                         WARN("DEFAULT_NO_BREAK",
7246                              "switch default: should use break\n" . $herectx);
7247                 }
7248
7249 # check for gcc specific __FUNCTION__
7250                 if ($line =~ /\b__FUNCTION__\b/) {
7251                         if (WARN("USE_FUNC",
7252                                  "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr) &&
7253                             $fix) {
7254                                 $fixed[$fixlinenr] =~ s/\b__FUNCTION__\b/__func__/g;
7255                         }
7256                 }
7257
7258 # check for uses of __DATE__, __TIME__, __TIMESTAMP__
7259                 while ($line =~ /\b(__(?:DATE|TIME|TIMESTAMP)__)\b/g) {
7260                         ERROR("DATE_TIME",
7261                               "Use of the '$1' macro makes the build non-deterministic\n" . $herecurr);
7262                 }
7263
7264 # check for use of yield()
7265                 if ($line =~ /\byield\s*\(\s*\)/) {
7266                         WARN("YIELD",
7267                              "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n"  . $herecurr);
7268                 }
7269
7270 # check for comparisons against true and false
7271                 if ($line =~ /\+\s*(.*?)\b(true|false|$Lval)\s*(==|\!=)\s*(true|false|$Lval)\b(.*)$/i) {
7272                         my $lead = $1;
7273                         my $arg = $2;
7274                         my $test = $3;
7275                         my $otype = $4;
7276                         my $trail = $5;
7277                         my $op = "!";
7278
7279                         ($arg, $otype) = ($otype, $arg) if ($arg =~ /^(?:true|false)$/i);
7280
7281                         my $type = lc($otype);
7282                         if ($type =~ /^(?:true|false)$/) {
7283                                 if (("$test" eq "==" && "$type" eq "true") ||
7284                                     ("$test" eq "!=" && "$type" eq "false")) {
7285                                         $op = "";
7286                                 }
7287
7288                                 CHK("BOOL_COMPARISON",
7289                                     "Using comparison to $otype is error prone\n" . $herecurr);
7290
7291 ## maybe suggesting a correct construct would better
7292 ##                                  "Using comparison to $otype is error prone.  Perhaps use '${lead}${op}${arg}${trail}'\n" . $herecurr);
7293
7294                         }
7295                 }
7296
7297 # check for semaphores initialized locked
7298                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
7299                         WARN("CONSIDER_COMPLETION",
7300                              "consider using a completion\n" . $herecurr);
7301                 }
7302
7303 # recommend kstrto* over simple_strto* and strict_strto*
7304                 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
7305                         WARN("CONSIDER_KSTRTO",
7306                              "$1 is obsolete, use k$3 instead\n" . $herecurr);
7307                 }
7308
7309 # check for __initcall(), use device_initcall() explicitly or more appropriate function please
7310                 if ($line =~ /^.\s*__initcall\s*\(/) {
7311                         WARN("USE_DEVICE_INITCALL",
7312                              "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr);
7313                 }
7314
7315 # check for spin_is_locked(), suggest lockdep instead
7316                 if ($line =~ /\bspin_is_locked\(/) {
7317                         WARN("USE_LOCKDEP",
7318                              "Where possible, use lockdep_assert_held instead of assertions based on spin_is_locked\n" . $herecurr);
7319                 }
7320
7321 # check for deprecated apis
7322                 if ($line =~ /\b($deprecated_apis_search)\b\s*\(/) {
7323                         my $deprecated_api = $1;
7324                         my $new_api = $deprecated_apis{$deprecated_api};
7325                         WARN("DEPRECATED_API",
7326                              "Deprecated use of '$deprecated_api', prefer '$new_api' instead\n" . $herecurr);
7327                 }
7328
7329 # check for various structs that are normally const (ops, kgdb, device_tree)
7330 # and avoid what seem like struct definitions 'struct foo {'
7331                 if (defined($const_structs) &&
7332                     $line !~ /\bconst\b/ &&
7333                     $line =~ /\bstruct\s+($const_structs)\b(?!\s*\{)/) {
7334                         WARN("CONST_STRUCT",
7335                              "struct $1 should normally be const\n" . $herecurr);
7336                 }
7337
7338 # use of NR_CPUS is usually wrong
7339 # ignore definitions of NR_CPUS and usage to define arrays as likely right
7340 # ignore designated initializers using NR_CPUS
7341                 if ($line =~ /\bNR_CPUS\b/ &&
7342                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
7343                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
7344                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
7345                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
7346                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/ &&
7347                     $line !~ /^.\s*\.\w+\s*=\s*.*\bNR_CPUS\b/)
7348                 {
7349                         WARN("NR_CPUS",
7350                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
7351                 }
7352
7353 # Use of __ARCH_HAS_<FOO> or ARCH_HAVE_<BAR> is wrong.
7354                 if ($line =~ /\+\s*#\s*define\s+((?:__)?ARCH_(?:HAS|HAVE)\w*)\b/) {
7355                         ERROR("DEFINE_ARCH_HAS",
7356                               "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr);
7357                 }
7358
7359 # likely/unlikely comparisons similar to "(likely(foo) > 0)"
7360                 if ($perl_version_ok &&
7361                     $line =~ /\b((?:un)?likely)\s*\(\s*$FuncArg\s*\)\s*$Compare/) {
7362                         WARN("LIKELY_MISUSE",
7363                              "Using $1 should generally have parentheses around the comparison\n" . $herecurr);
7364                 }
7365
7366 # return sysfs_emit(foo, fmt, ...) fmt without newline
7367                 if ($line =~ /\breturn\s+sysfs_emit\s*\(\s*$FuncArg\s*,\s*($String)/ &&
7368                     substr($rawline, $-[6], $+[6] - $-[6]) !~ /\\n"$/) {
7369                         my $offset = $+[6] - 1;
7370                         if (WARN("SYSFS_EMIT",
7371                                  "return sysfs_emit(...) formats should include a terminating newline\n" . $herecurr) &&
7372                             $fix) {
7373                                 substr($fixed[$fixlinenr], $offset, 0) = '\\n';
7374                         }
7375                 }
7376
7377 # nested likely/unlikely calls
7378                 if ($line =~ /\b(?:(?:un)?likely)\s*\(\s*!?\s*(IS_ERR(?:_OR_NULL|_VALUE)?|WARN)/) {
7379                         WARN("LIKELY_MISUSE",
7380                              "nested (un)?likely() calls, $1 already uses unlikely() internally\n" . $herecurr);
7381                 }
7382
7383 # whine mightly about in_atomic
7384                 if ($line =~ /\bin_atomic\s*\(/) {
7385                         if ($realfile =~ m@^drivers/@) {
7386                                 ERROR("IN_ATOMIC",
7387                                       "do not use in_atomic in drivers\n" . $herecurr);
7388                         } elsif ($realfile !~ m@^kernel/@) {
7389                                 WARN("IN_ATOMIC",
7390                                      "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
7391                         }
7392                 }
7393
7394 # check for lockdep_set_novalidate_class
7395                 if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
7396                     $line =~ /__lockdep_no_validate__\s*\)/ ) {
7397                         if ($realfile !~ m@^kernel/lockdep@ &&
7398                             $realfile !~ m@^include/linux/lockdep@ &&
7399                             $realfile !~ m@^drivers/base/core@) {
7400                                 ERROR("LOCKDEP",
7401                                       "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
7402                         }
7403                 }
7404
7405                 if ($line =~ /debugfs_create_\w+.*\b$mode_perms_world_writable\b/ ||
7406                     $line =~ /DEVICE_ATTR.*\b$mode_perms_world_writable\b/) {
7407                         WARN("EXPORTED_WORLD_WRITABLE",
7408                              "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
7409                 }
7410
7411 # check for DEVICE_ATTR uses that could be DEVICE_ATTR_<FOO>
7412 # and whether or not function naming is typical and if
7413 # DEVICE_ATTR permissions uses are unusual too
7414                 if ($perl_version_ok &&
7415                     defined $stat &&
7416                     $stat =~ /\bDEVICE_ATTR\s*\(\s*(\w+)\s*,\s*\(?\s*(\s*(?:${multi_mode_perms_string_search}|0[0-7]{3,3})\s*)\s*\)?\s*,\s*(\w+)\s*,\s*(\w+)\s*\)/) {
7417                         my $var = $1;
7418                         my $perms = $2;
7419                         my $show = $3;
7420                         my $store = $4;
7421                         my $octal_perms = perms_to_octal($perms);
7422                         if ($show =~ /^${var}_show$/ &&
7423                             $store =~ /^${var}_store$/ &&
7424                             $octal_perms eq "0644") {
7425                                 if (WARN("DEVICE_ATTR_RW",
7426                                          "Use DEVICE_ATTR_RW\n" . $herecurr) &&
7427                                     $fix) {
7428                                         $fixed[$fixlinenr] =~ s/\bDEVICE_ATTR\s*\(\s*$var\s*,\s*\Q$perms\E\s*,\s*$show\s*,\s*$store\s*\)/DEVICE_ATTR_RW(${var})/;
7429                                 }
7430                         } elsif ($show =~ /^${var}_show$/ &&
7431                                  $store =~ /^NULL$/ &&
7432                                  $octal_perms eq "0444") {
7433                                 if (WARN("DEVICE_ATTR_RO",
7434                                          "Use DEVICE_ATTR_RO\n" . $herecurr) &&
7435                                     $fix) {
7436                                         $fixed[$fixlinenr] =~ s/\bDEVICE_ATTR\s*\(\s*$var\s*,\s*\Q$perms\E\s*,\s*$show\s*,\s*NULL\s*\)/DEVICE_ATTR_RO(${var})/;
7437                                 }
7438                         } elsif ($show =~ /^NULL$/ &&
7439                                  $store =~ /^${var}_store$/ &&
7440                                  $octal_perms eq "0200") {
7441                                 if (WARN("DEVICE_ATTR_WO",
7442                                          "Use DEVICE_ATTR_WO\n" . $herecurr) &&
7443                                     $fix) {
7444                                         $fixed[$fixlinenr] =~ s/\bDEVICE_ATTR\s*\(\s*$var\s*,\s*\Q$perms\E\s*,\s*NULL\s*,\s*$store\s*\)/DEVICE_ATTR_WO(${var})/;
7445                                 }
7446                         } elsif ($octal_perms eq "0644" ||
7447                                  $octal_perms eq "0444" ||
7448                                  $octal_perms eq "0200") {
7449                                 my $newshow = "$show";
7450                                 $newshow = "${var}_show" if ($show ne "NULL" && $show ne "${var}_show");
7451                                 my $newstore = $store;
7452                                 $newstore = "${var}_store" if ($store ne "NULL" && $store ne "${var}_store");
7453                                 my $rename = "";
7454                                 if ($show ne $newshow) {
7455                                         $rename .= " '$show' to '$newshow'";
7456                                 }
7457                                 if ($store ne $newstore) {
7458                                         $rename .= " '$store' to '$newstore'";
7459                                 }
7460                                 WARN("DEVICE_ATTR_FUNCTIONS",
7461                                      "Consider renaming function(s)$rename\n" . $herecurr);
7462                         } else {
7463                                 WARN("DEVICE_ATTR_PERMS",
7464                                      "DEVICE_ATTR unusual permissions '$perms' used\n" . $herecurr);
7465                         }
7466                 }
7467
7468 # Mode permission misuses where it seems decimal should be octal
7469 # This uses a shortcut match to avoid unnecessary uses of a slow foreach loop
7470 # o Ignore module_param*(...) uses with a decimal 0 permission as that has a
7471 #   specific definition of not visible in sysfs.
7472 # o Ignore proc_create*(...) uses with a decimal 0 permission as that means
7473 #   use the default permissions
7474                 if ($perl_version_ok &&
7475                     defined $stat &&
7476                     $line =~ /$mode_perms_search/) {
7477                         foreach my $entry (@mode_permission_funcs) {
7478                                 my $func = $entry->[0];
7479                                 my $arg_pos = $entry->[1];
7480
7481                                 my $lc = $stat =~ tr@\n@@;
7482                                 $lc = $lc + $linenr;
7483                                 my $stat_real = get_stat_real($linenr, $lc);
7484
7485                                 my $skip_args = "";
7486                                 if ($arg_pos > 1) {
7487                                         $arg_pos--;
7488                                         $skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}";
7489                                 }
7490                                 my $test = "\\b$func\\s*\\(${skip_args}($FuncArg(?:\\|\\s*$FuncArg)*)\\s*[,\\)]";
7491                                 if ($stat =~ /$test/) {
7492                                         my $val = $1;
7493                                         $val = $6 if ($skip_args ne "");
7494                                         if (!($func =~ /^(?:module_param|proc_create)/ && $val eq "0") &&
7495                                             (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
7496                                              ($val =~ /^$Octal$/ && length($val) ne 4))) {
7497                                                 ERROR("NON_OCTAL_PERMISSIONS",
7498                                                       "Use 4 digit octal (0777) not decimal permissions\n" . "$here\n" . $stat_real);
7499                                         }
7500                                         if ($val =~ /^$Octal$/ && (oct($val) & 02)) {
7501                                                 ERROR("EXPORTED_WORLD_WRITABLE",
7502                                                       "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . "$here\n" . $stat_real);
7503                                         }
7504                                 }
7505                         }
7506                 }
7507
7508 # check for uses of S_<PERMS> that could be octal for readability
7509                 while ($line =~ m{\b($multi_mode_perms_string_search)\b}g) {
7510                         my $oval = $1;
7511                         my $octal = perms_to_octal($oval);
7512                         if (WARN("SYMBOLIC_PERMS",
7513                                  "Symbolic permissions '$oval' are not preferred. Consider using octal permissions '$octal'.\n" . $herecurr) &&
7514                             $fix) {
7515                                 $fixed[$fixlinenr] =~ s/\Q$oval\E/$octal/;
7516                         }
7517                 }
7518
7519 # validate content of MODULE_LICENSE against list from include/linux/module.h
7520                 if ($line =~ /\bMODULE_LICENSE\s*\(\s*($String)\s*\)/) {
7521                         my $extracted_string = get_quoted_string($line, $rawline);
7522                         my $valid_licenses = qr{
7523                                                 GPL|
7524                                                 GPL\ v2|
7525                                                 GPL\ and\ additional\ rights|
7526                                                 Dual\ BSD/GPL|
7527                                                 Dual\ MIT/GPL|
7528                                                 Dual\ MPL/GPL|
7529                                                 Proprietary
7530                                         }x;
7531                         if ($extracted_string !~ /^"(?:$valid_licenses)"$/x) {
7532                                 WARN("MODULE_LICENSE",
7533                                      "unknown module license " . $extracted_string . "\n" . $herecurr);
7534                         }
7535                 }
7536
7537 # check for sysctl duplicate constants
7538                 if ($line =~ /\.extra[12]\s*=\s*&(zero|one|int_max)\b/) {
7539                         WARN("DUPLICATED_SYSCTL_CONST",
7540                                 "duplicated sysctl range checking value '$1', consider using the shared one in include/linux/sysctl.h\n" . $herecurr);
7541                 }
7542         }
7543
7544         # If we have no input at all, then there is nothing to report on
7545         # so just keep quiet.
7546         if ($#rawlines == -1) {
7547                 exit(0);
7548         }
7549
7550         # In mailback mode only produce a report in the negative, for
7551         # things that appear to be patches.
7552         if ($mailback && ($clean == 1 || !$is_patch)) {
7553                 exit(0);
7554         }
7555
7556         # This is not a patch, and we are in 'no-patch' mode so
7557         # just keep quiet.
7558         if (!$chk_patch && !$is_patch) {
7559                 exit(0);
7560         }
7561
7562         if (!$is_patch && $filename !~ /cover-letter\.patch$/) {
7563                 ERROR("NOT_UNIFIED_DIFF",
7564                       "Does not appear to be a unified-diff format patch\n");
7565         }
7566         if ($is_patch && $has_commit_log && $chk_signoff) {
7567                 if ($signoff == 0) {
7568                         ERROR("MISSING_SIGN_OFF",
7569                               "Missing Signed-off-by: line(s)\n");
7570                 } elsif ($authorsignoff != 1) {
7571                         # authorsignoff values:
7572                         # 0 -> missing sign off
7573                         # 1 -> sign off identical
7574                         # 2 -> names and addresses match, comments mismatch
7575                         # 3 -> addresses match, names different
7576                         # 4 -> names match, addresses different
7577                         # 5 -> names match, addresses excluding subaddress details (refer RFC 5233) match
7578
7579                         my $sob_msg = "'From: $author' != 'Signed-off-by: $author_sob'";
7580
7581                         if ($authorsignoff == 0) {
7582                                 ERROR("NO_AUTHOR_SIGN_OFF",
7583                                       "Missing Signed-off-by: line by nominal patch author '$author'\n");
7584                         } elsif ($authorsignoff == 2) {
7585                                 CHK("FROM_SIGN_OFF_MISMATCH",
7586                                     "From:/Signed-off-by: email comments mismatch: $sob_msg\n");
7587                         } elsif ($authorsignoff == 3) {
7588                                 WARN("FROM_SIGN_OFF_MISMATCH",
7589                                      "From:/Signed-off-by: email name mismatch: $sob_msg\n");
7590                         } elsif ($authorsignoff == 4) {
7591                                 WARN("FROM_SIGN_OFF_MISMATCH",
7592                                      "From:/Signed-off-by: email address mismatch: $sob_msg\n");
7593                         } elsif ($authorsignoff == 5) {
7594                                 WARN("FROM_SIGN_OFF_MISMATCH",
7595                                      "From:/Signed-off-by: email subaddress mismatch: $sob_msg\n");
7596                         }
7597                 }
7598         }
7599
7600         print report_dump();
7601         if ($summary && !($clean == 1 && $quiet == 1)) {
7602                 print "$filename " if ($summary_file);
7603                 print "total: $cnt_error errors, $cnt_warn warnings, " .
7604                         (($check)? "$cnt_chk checks, " : "") .
7605                         "$cnt_lines lines checked\n";
7606         }
7607
7608         if ($quiet == 0) {
7609                 # If there were any defects found and not already fixing them
7610                 if (!$clean and !$fix) {
7611                         print << "EOM"
7612
7613 NOTE: For some of the reported defects, checkpatch may be able to
7614       mechanically convert to the typical style using --fix or --fix-inplace.
7615 EOM
7616                 }
7617                 # If there were whitespace errors which cleanpatch can fix
7618                 # then suggest that.
7619                 if ($rpt_cleaners) {
7620                         $rpt_cleaners = 0;
7621                         print << "EOM"
7622
7623 NOTE: Whitespace errors detected.
7624       You may wish to use scripts/cleanpatch or scripts/cleanfile
7625 EOM
7626                 }
7627         }
7628
7629         if ($clean == 0 && $fix &&
7630             ("@rawlines" ne "@fixed" ||
7631              $#fixed_inserted >= 0 || $#fixed_deleted >= 0)) {
7632                 my $newfile = $filename;
7633                 $newfile .= ".EXPERIMENTAL-checkpatch-fixes" if (!$fix_inplace);
7634                 my $linecount = 0;
7635                 my $f;
7636
7637                 @fixed = fix_inserted_deleted_lines(\@fixed, \@fixed_inserted, \@fixed_deleted);
7638
7639                 open($f, '>', $newfile)
7640                     or die "$P: Can't open $newfile for write\n";
7641                 foreach my $fixed_line (@fixed) {
7642                         $linecount++;
7643                         if ($file) {
7644                                 if ($linecount > 3) {
7645                                         $fixed_line =~ s/^\+//;
7646                                         print $f $fixed_line . "\n";
7647                                 }
7648                         } else {
7649                                 print $f $fixed_line . "\n";
7650                         }
7651                 }
7652                 close($f);
7653
7654                 if (!$quiet) {
7655                         print << "EOM";
7656
7657 Wrote EXPERIMENTAL --fix correction(s) to '$newfile'
7658
7659 Do _NOT_ trust the results written to this file.
7660 Do _NOT_ submit these changes without inspecting them for correctness.
7661
7662 This EXPERIMENTAL file is simply a convenience to help rewrite patches.
7663 No warranties, expressed or implied...
7664 EOM
7665                 }
7666         }
7667
7668         if ($quiet == 0) {
7669                 print "\n";
7670                 if ($clean == 1) {
7671                         print "$vname has no obvious style problems and is ready for submission.\n";
7672                 } else {
7673                         print "$vname has style problems, please review.\n";
7674                 }
7675         }
7676         return $clean;
7677 }