Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 14
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc4
   6 NAME = Opossums on Parade
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 $(if $(filter __%, $(MAKECMDGOALS)), \
  15         $(error targets prefixed with '__' are only for internal use))
  16
  17 # That's our default target when none is given on the command line
  18 PHONY := __all
  19 __all:
  20
  21 # We are using a recursive build, so we need to do a little thinking
  22 # to get the ordering right.
  23 #
  24 # Most importantly: sub-Makefiles should only ever modify files in
  25 # their own directory. If in some directory we have a dependency on
  26 # a file in another dir (which doesn't happen often, but it's often
  27 # unavoidable when linking the built-in.a targets which finally
  28 # turn into vmlinux), we will call a sub make in that other dir, and
  29 # after that we are sure that everything which is in that other dir
  30 # is now up to date.
  31 #
  32 # The only cases where we need to modify files which have global
  33 # effects are thus separated out and done before the recursive
  34 # descending is started. They are now explicitly listed as the
  35 # prepare rule.
  36
  37 ifneq ($(sub_make_done),1)
  38
  39 # Do not use make's built-in rules and variables
  40 # (this increases performance and avoids hard-to-debug behaviour)
  41 MAKEFLAGS += -rR
  42
  43 # Avoid funny character set dependencies
  44 unexport LC_ALL
  45 LC_COLLATE=C
  46 LC_NUMERIC=C
  47 export LC_COLLATE LC_NUMERIC
  48
  49 # Avoid interference with shell env settings
  50 unexport GREP_OPTIONS
  51
  52 # Beautify output
  53 # ---------------------------------------------------------------------------
  54 #
  55 # Normally, we echo the whole command before executing it. By making
  56 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  57 # $(quiet) to choose other forms of output instead, e.g.
  58 #
  59 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  60 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  61 #
  62 # If $(quiet) is empty, the whole command will be printed.
  63 # If it is set to "quiet_", only the short version will be printed.
  64 # If it is set to "silent_", nothing will be printed at all, since
  65 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  66 #
  67 # A simple variant is to prefix commands with $(Q) - that's useful
  68 # for commands that shall be hidden in non-verbose mode.
  69 #
  70 #       $(Q)ln $@ :<
  71 #
  72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
  75 #
  76 # To put more focus on warnings, be less verbose as default
  77 # Use 'make V=1' to see the full commands
  78
  79 ifeq ("$(origin V)", "command line")
  80   KBUILD_VERBOSE = $(V)
  81 endif
  82 ifndef KBUILD_VERBOSE
  83   KBUILD_VERBOSE = 0
  84 endif
  85
  86 ifeq ($(KBUILD_VERBOSE),1)
  87   quiet =
  88   Q =
  89 else
  90   quiet=quiet_
  91   Q = @
  92 endif
  93
  94 # If the user is running make -s (silent mode), suppress echoing of
  95 # commands
  96
  97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  98   quiet=silent_
  99   KBUILD_VERBOSE = 0
 100 endif
 101
 102 export quiet Q KBUILD_VERBOSE
 103
 104 # Call a source code checker (by default, "sparse") as part of the
 105 # C compilation.
 106 #
 107 # Use 'make C=1' to enable checking of only re-compiled files.
 108 # Use 'make C=2' to enable checking of *all* source files, regardless
 109 # of whether they are re-compiled or not.
 110 #
 111 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 112 # including where to get the "sparse" utility.
 113
 114 ifeq ("$(origin C)", "command line")
 115   KBUILD_CHECKSRC = $(C)
 116 endif
 117 ifndef KBUILD_CHECKSRC
 118   KBUILD_CHECKSRC = 0
 119 endif
 120
 121 export KBUILD_CHECKSRC
 122
 123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 124 # directory of external module to build. Setting M= takes precedence.
 125 ifeq ("$(origin M)", "command line")
 126   KBUILD_EXTMOD := $(M)
 127 endif
 128
 129 $(if $(word 2, $(KBUILD_EXTMOD)), \
 130         $(error building multiple external modules is not supported))
 131
 132 # Remove trailing slashes
 133 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 134 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 135 endif
 136
 137 export KBUILD_EXTMOD
 138
 139 # Kbuild will save output files in the current working directory.
 140 # This does not need to match to the root of the kernel source tree.
 141 #
 142 # For example, you can do this:
 143 #
 144 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 145 #
 146 # If you want to save output files in a different location, there are
 147 # two syntaxes to specify it.
 148 #
 149 # 1) O=
 150 # Use "make O=dir/to/store/output/files/"
 151 #
 152 # 2) Set KBUILD_OUTPUT
 153 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 154 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 155 #
 156 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 157 # variable.
 158
 159 # Do we want to change the working directory?
 160 ifeq ("$(origin O)", "command line")
 161   KBUILD_OUTPUT := $(O)
 162 endif
 163
 164 ifneq ($(KBUILD_OUTPUT),)
 165 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 166 # expand a shell special character '~'. We use a somewhat tedious way here.
 167 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 168 $(if $(abs_objtree),, \
 169      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 170
 171 # $(realpath ...) resolves symlinks
 172 abs_objtree := $(realpath $(abs_objtree))
 173 else
 174 abs_objtree := $(CURDIR)
 175 endif # ifneq ($(KBUILD_OUTPUT),)
 176
 177 ifeq ($(abs_objtree),$(CURDIR))
 178 # Suppress "Entering directory ..." unless we are changing the work directory.
 179 MAKEFLAGS += --no-print-directory
 180 else
 181 need-sub-make := 1
 182 endif
 183
 184 this-makefile := $(lastword $(MAKEFILE_LIST))
 185 abs_srctree := $(realpath $(dir $(this-makefile)))
 186
 187 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 188 $(error source directory cannot contain spaces or colons)
 189 endif
 190
 191 ifneq ($(abs_srctree),$(abs_objtree))
 192 # Look for make include files relative to root of kernel src
 193 #
 194 # This does not become effective immediately because MAKEFLAGS is re-parsed
 195 # once after the Makefile is read. We need to invoke sub-make.
 196 MAKEFLAGS += --include-dir=$(abs_srctree)
 197 need-sub-make := 1
 198 endif
 199
 200 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 201 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 202 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 203 need-sub-make := 1
 204 # Cancel implicit rules for this Makefile.
 205 $(this-makefile): ;
 206 endif
 207
 208 export abs_srctree abs_objtree
 209 export sub_make_done := 1
 210
 211 ifeq ($(need-sub-make),1)
 212
 213 PHONY += $(MAKECMDGOALS) __sub-make
 214
 215 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 216         @:
 217
 218 # Invoke a second make in the output directory, passing relevant variables
 219 __sub-make:
 220         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 221
 222 endif # need-sub-make
 223 endif # sub_make_done
 224
 225 # We process the rest of the Makefile if this is the final invocation of make
 226 ifeq ($(need-sub-make),)
 227
 228 # Do not print "Entering directory ...",
 229 # but we want to display it when entering to the output directory
 230 # so that IDEs/editors are able to understand relative filenames.
 231 MAKEFLAGS += --no-print-directory
 232
 233 ifeq ($(abs_srctree),$(abs_objtree))
 234         # building in the source tree
 235         srctree := .
 236         building_out_of_srctree :=
 237 else
 238         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 239                 # building in a subdirectory of the source tree
 240                 srctree := ..
 241         else
 242                 srctree := $(abs_srctree)
 243         endif
 244         building_out_of_srctree := 1
 245 endif
 246
 247 ifneq ($(KBUILD_ABS_SRCTREE),)
 248 srctree := $(abs_srctree)
 249 endif
 250
 251 objtree         := .
 252 VPATH           := $(srctree)
 253
 254 export building_out_of_srctree srctree objtree VPATH
 255
 256 # To make sure we do not include .config for any of the *config targets
 257 # catch them early, and hand them over to scripts/kconfig/Makefile
 258 # It is allowed to specify more targets when calling make, including
 259 # mixing *config targets and build targets.
 260 # For example 'make oldconfig all'.
 261 # Detect when mixed targets is specified, and make a second invocation
 262 # of make so .config is not included in this case either (for *config).
 263
 264 version_h := include/generated/uapi/linux/version.h
 265
 266 clean-targets := %clean mrproper cleandocs
 267 no-dot-config-targets := $(clean-targets) \
 268                          cscope gtags TAGS tags help% %docs check% coccicheck \
 269                          $(version_h) headers headers_% archheaders archscripts \
 270                          %asm-generic kernelversion %src-pkg dt_binding_check \
 271                          outputmakefile
 272 # Installation targets should not require compiler. Unfortunately, vdso_install
 273 # is an exception where build artifacts may be updated. This must be fixed.
 274 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
 275                         headers_install modules_install kernelrelease image_name
 276 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
 277                           image_name
 278 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 279
 280 config-build    :=
 281 mixed-build     :=
 282 need-config     := 1
 283 need-compiler   := 1
 284 may-sync-config := 1
 285 single-build    :=
 286
 287 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 288         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 289                 need-config :=
 290         endif
 291 endif
 292
 293 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
 294         ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
 295                 need-compiler :=
 296         endif
 297 endif
 298
 299 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 300         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 301                 may-sync-config :=
 302         endif
 303 endif
 304
 305 ifneq ($(KBUILD_EXTMOD),)
 306         may-sync-config :=
 307 endif
 308
 309 ifeq ($(KBUILD_EXTMOD),)
 310         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 311                 config-build := 1
 312                 ifneq ($(words $(MAKECMDGOALS)),1)
 313                         mixed-build := 1
 314                 endif
 315         endif
 316 endif
 317
 318 # We cannot build single targets and the others at the same time
 319 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 320         single-build := 1
 321         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 322                 mixed-build := 1
 323         endif
 324 endif
 325
 326 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 327 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 328         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 329                 mixed-build := 1
 330         endif
 331 endif
 332
 333 # install and modules_install need also be processed one by one
 334 ifneq ($(filter install,$(MAKECMDGOALS)),)
 335         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 336                 mixed-build := 1
 337         endif
 338 endif
 339
 340 ifdef mixed-build
 341 # ===========================================================================
 342 # We're called with mixed targets (*config and build targets).
 343 # Handle them one by one.
 344
 345 PHONY += $(MAKECMDGOALS) __build_one_by_one
 346
 347 $(MAKECMDGOALS): __build_one_by_one
 348         @:
 349
 350 __build_one_by_one:
 351         $(Q)set -e; \
 352         for i in $(MAKECMDGOALS); do \
 353                 $(MAKE) -f $(srctree)/Makefile $$i; \
 354         done
 355
 356 else # !mixed-build
 357
 358 include $(srctree)/scripts/Kbuild.include
 359
 360 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 361 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 362 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 363 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 364
 365 include $(srctree)/scripts/subarch.include
 366
 367 # Cross compiling and selecting different set of gcc/bin-utils
 368 # ---------------------------------------------------------------------------
 369 #
 370 # When performing cross compilation for other architectures ARCH shall be set
 371 # to the target architecture. (See arch/* for the possibilities).
 372 # ARCH can be set during invocation of make:
 373 # make ARCH=ia64
 374 # Another way is to have ARCH set in the environment.
 375 # The default ARCH is the host where make is executed.
 376
 377 # CROSS_COMPILE specify the prefix used for all executables used
 378 # during compilation. Only gcc and related bin-utils executables
 379 # are prefixed with $(CROSS_COMPILE).
 380 # CROSS_COMPILE can be set on the command line
 381 # make CROSS_COMPILE=ia64-linux-
 382 # Alternatively CROSS_COMPILE can be set in the environment.
 383 # Default value for CROSS_COMPILE is not to prefix executables
 384 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 385 ARCH            ?= $(SUBARCH)
 386
 387 # Architecture as present in compile.h
 388 UTS_MACHINE     := $(ARCH)
 389 SRCARCH         := $(ARCH)
 390
 391 # Additional ARCH settings for x86
 392 ifeq ($(ARCH),i386)
 393         SRCARCH := x86
 394 endif
 395 ifeq ($(ARCH),x86_64)
 396         SRCARCH := x86
 397 endif
 398
 399 # Additional ARCH settings for sparc
 400 ifeq ($(ARCH),sparc32)
 401        SRCARCH := sparc
 402 endif
 403 ifeq ($(ARCH),sparc64)
 404        SRCARCH := sparc
 405 endif
 406
 407 export cross_compiling :=
 408 ifneq ($(SRCARCH),$(SUBARCH))
 409 cross_compiling := 1
 410 endif
 411
 412 KCONFIG_CONFIG  ?= .config
 413 export KCONFIG_CONFIG
 414
 415 # SHELL used by kbuild
 416 CONFIG_SHELL := sh
 417
 418 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 419 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 420 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 421
 422 ifneq ($(LLVM),)
 423 HOSTCC  = clang
 424 HOSTCXX = clang++
 425 else
 426 HOSTCC  = gcc
 427 HOSTCXX = g++
 428 endif
 429
 430 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 431                               -O2 -fomit-frame-pointer -std=gnu89
 432 export KBUILD_USERLDFLAGS :=
 433
 434 KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 435 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 436 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 437 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 438
 439 # Make variables (CC, etc...)
 440 CPP             = $(CC) -E
 441 ifneq ($(LLVM),)
 442 CC              = clang
 443 LD              = ld.lld
 444 AR              = llvm-ar
 445 NM              = llvm-nm
 446 OBJCOPY         = llvm-objcopy
 447 OBJDUMP         = llvm-objdump
 448 READELF         = llvm-readelf
 449 STRIP           = llvm-strip
 450 else
 451 CC              = $(CROSS_COMPILE)gcc
 452 LD              = $(CROSS_COMPILE)ld
 453 AR              = $(CROSS_COMPILE)ar
 454 NM              = $(CROSS_COMPILE)nm
 455 OBJCOPY         = $(CROSS_COMPILE)objcopy
 456 OBJDUMP         = $(CROSS_COMPILE)objdump
 457 READELF         = $(CROSS_COMPILE)readelf
 458 STRIP           = $(CROSS_COMPILE)strip
 459 endif
 460 PAHOLE          = pahole
 461 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 462 LEX             = flex
 463 YACC            = bison
 464 AWK             = awk
 465 INSTALLKERNEL  := installkernel
 466 DEPMOD          = depmod
 467 PERL            = perl
 468 PYTHON3         = python3
 469 CHECK           = sparse
 470 BASH            = bash
 471 KGZIP           = gzip
 472 KBZIP2          = bzip2
 473 KLZOP           = lzop
 474 LZMA            = lzma
 475 LZ4             = lz4c
 476 XZ              = xz
 477 ZSTD            = zstd
 478
 479 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 480                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 481 NOSTDINC_FLAGS :=
 482 CFLAGS_MODULE   =
 483 AFLAGS_MODULE   =
 484 LDFLAGS_MODULE  =
 485 CFLAGS_KERNEL   =
 486 AFLAGS_KERNEL   =
 487 LDFLAGS_vmlinux =
 488
 489 # Use USERINCLUDE when you must reference the UAPI directories only.
 490 USERINCLUDE    := \
 491                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 492                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 493                 -I$(srctree)/include/uapi \
 494                 -I$(objtree)/include/generated/uapi \
 495                 -include $(srctree)/include/linux/compiler-version.h \
 496                 -include $(srctree)/include/linux/kconfig.h
 497
 498 # Use LINUXINCLUDE when you must reference the include/ directory.
 499 # Needed to be compatible with the O= option
 500 LINUXINCLUDE    := \
 501                 -I$(srctree)/arch/$(SRCARCH)/include \
 502                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 503                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 504                 -I$(objtree)/include \
 505                 $(USERINCLUDE)
 506
 507 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 508 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 509                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 510                    -Werror=implicit-function-declaration -Werror=implicit-int \
 511                    -Werror=return-type -Wno-format-security \
 512                    -std=gnu89
 513 KBUILD_CPPFLAGS := -D__KERNEL__
 514 KBUILD_AFLAGS_KERNEL :=
 515 KBUILD_CFLAGS_KERNEL :=
 516 KBUILD_AFLAGS_MODULE  := -DMODULE
 517 KBUILD_CFLAGS_MODULE  := -DMODULE
 518 KBUILD_LDFLAGS_MODULE :=
 519 KBUILD_LDFLAGS :=
 520 CLANG_FLAGS :=
 521
 522 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 523 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 524 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 525 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 526 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 527
 528 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 529 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 530 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 531 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 532 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 533
 534 # Files to ignore in find ... statements
 535
 536 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 537                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 538                           -prune -o
 539 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 540                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 541
 542 # ===========================================================================
 543 # Rules shared between *config targets and build targets
 544
 545 # Basic helpers built in scripts/basic/
 546 PHONY += scripts_basic
 547 scripts_basic:
 548         $(Q)$(MAKE) $(build)=scripts/basic
 549         $(Q)rm -f .tmp_quiet_recordmcount
 550
 551 PHONY += outputmakefile
 552 ifdef building_out_of_srctree
 553 # Before starting out-of-tree build, make sure the source tree is clean.
 554 # outputmakefile generates a Makefile in the output directory, if using a
 555 # separate output directory. This allows convenient use of make in the
 556 # output directory.
 557 # At the same time when output Makefile generated, generate .gitignore to
 558 # ignore whole output directory
 559
 560 quiet_cmd_makefile = GEN     Makefile
 561       cmd_makefile = { \
 562         echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 563         echo "include $(srctree)/Makefile"; \
 564         } > Makefile
 565
 566 outputmakefile:
 567         $(Q)if [ -f $(srctree)/.config -o \
 568                  -d $(srctree)/include/config -o \
 569                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 570                 echo >&2 "***"; \
 571                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 572                 echo >&2 "*** in $(abs_srctree)";\
 573                 echo >&2 "***"; \
 574                 false; \
 575         fi
 576         $(Q)ln -fsn $(srctree) source
 577         $(call cmd,makefile)
 578         $(Q)test -e .gitignore || \
 579         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 580 endif
 581
 582 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 583 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 584 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 585 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 586 CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1))
 587
 588 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 589 ifneq ($(CROSS_COMPILE),)
 590 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 591 endif
 592 ifeq ($(LLVM_IAS),1)
 593 CLANG_FLAGS     += -integrated-as
 594 else
 595 CLANG_FLAGS     += -no-integrated-as
 596 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 597 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 598 endif
 599 CLANG_FLAGS     += -Werror=unknown-warning-option
 600 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 601 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 602 export CLANG_FLAGS
 603 endif
 604
 605 # Include this also for config targets because some architectures need
 606 # cc-cross-prefix to determine CROSS_COMPILE.
 607 ifdef need-compiler
 608 include $(srctree)/scripts/Makefile.compiler
 609 endif
 610
 611 ifdef config-build
 612 # ===========================================================================
 613 # *config targets only - make sure prerequisites are updated, and descend
 614 # in scripts/kconfig to make the *config target
 615
 616 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 617 # KBUILD_DEFCONFIG may point out an alternative default configuration
 618 # used for 'make defconfig'
 619 include $(srctree)/arch/$(SRCARCH)/Makefile
 620 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 621
 622 config: outputmakefile scripts_basic FORCE
 623         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 624
 625 %config: outputmakefile scripts_basic FORCE
 626         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 627
 628 else #!config-build
 629 # ===========================================================================
 630 # Build targets only - this includes vmlinux, arch specific targets, clean
 631 # targets and others. In general all targets except *config targets.
 632
 633 # If building an external module we do not care about the all: rule
 634 # but instead __all depend on modules
 635 PHONY += all
 636 ifeq ($(KBUILD_EXTMOD),)
 637 __all: all
 638 else
 639 __all: modules
 640 endif
 641
 642 # Decide whether to build built-in, modular, or both.
 643 # Normally, just do built-in.
 644
 645 KBUILD_MODULES :=
 646 KBUILD_BUILTIN := 1
 647
 648 # If we have only "make modules", don't compile built-in objects.
 649 ifeq ($(MAKECMDGOALS),modules)
 650   KBUILD_BUILTIN :=
 651 endif
 652
 653 # If we have "make <whatever> modules", compile modules
 654 # in addition to whatever we do anyway.
 655 # Just "make" or "make all" shall build modules as well
 656
 657 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 658   KBUILD_MODULES := 1
 659 endif
 660
 661 ifeq ($(MAKECMDGOALS),)
 662   KBUILD_MODULES := 1
 663 endif
 664
 665 export KBUILD_MODULES KBUILD_BUILTIN
 666
 667 ifdef need-config
 668 include include/config/auto.conf
 669 endif
 670
 671 ifeq ($(KBUILD_EXTMOD),)
 672 # Objects we will link into vmlinux / subdirs we need to visit
 673 core-y          := init/ usr/ arch/$(SRCARCH)/
 674 drivers-y       := drivers/ sound/
 675 drivers-$(CONFIG_SAMPLES) += samples/
 676 drivers-$(CONFIG_NET) += net/
 677 drivers-y       += virt/
 678 libs-y          := lib/
 679 endif # KBUILD_EXTMOD
 680
 681 # The all: target is the default when no target is given on the
 682 # command line.
 683 # This allow a user to issue only 'make' to build a kernel including modules
 684 # Defaults to vmlinux, but the arch makefile usually adds further targets
 685 all: vmlinux
 686
 687 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 688         $(call cc-option,-fno-tree-loop-im) \
 689         $(call cc-disable-warning,maybe-uninitialized,)
 690 export CFLAGS_GCOV
 691
 692 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 693 ifdef CONFIG_FUNCTION_TRACER
 694   CC_FLAGS_FTRACE := -pg
 695 endif
 696
 697 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 698 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 699 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 700 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 701 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 702 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 703 export RETPOLINE_CFLAGS
 704 export RETPOLINE_VDSO_CFLAGS
 705
 706 include $(srctree)/arch/$(SRCARCH)/Makefile
 707
 708 ifdef need-config
 709 ifdef may-sync-config
 710 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 711 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 712 # because some architectures define CROSS_COMPILE there.
 713 include include/config/auto.conf.cmd
 714
 715 $(KCONFIG_CONFIG):
 716         @echo >&2 '***'
 717         @echo >&2 '*** Configuration file "$@" not found!'
 718         @echo >&2 '***'
 719         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 720         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 721         @echo >&2 '***'
 722         @/bin/false
 723
 724 # The actual configuration files used during the build are stored in
 725 # include/generated/ and include/config/. Update them if .config is newer than
 726 # include/config/auto.conf (which mirrors .config).
 727 #
 728 # This exploits the 'multi-target pattern rule' trick.
 729 # The syncconfig should be executed only once to make all the targets.
 730 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 731 #
 732 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 733 # so you cannot notice that Kconfig is waiting for the user input.
 734 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
 735         $(Q)$(kecho) "  SYNC    $@"
 736         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 737 else # !may-sync-config
 738 # External modules and some install targets need include/generated/autoconf.h
 739 # and include/config/auto.conf but do not care if they are up-to-date.
 740 # Use auto.conf to trigger the test
 741 PHONY += include/config/auto.conf
 742
 743 include/config/auto.conf:
 744         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 745         echo >&2;                                                       \
 746         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 747         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 748         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 749         echo >&2 ;                                                      \
 750         /bin/false)
 751
 752 endif # may-sync-config
 753 endif # need-config
 754
 755 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 756 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 757 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 758 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 759 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 760
 761 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 762 KBUILD_CFLAGS += -O2
 763 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 764 KBUILD_CFLAGS += -O3
 765 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 766 KBUILD_CFLAGS += -Os
 767 endif
 768
 769 # Tell gcc to never replace conditional load with a non-conditional one
 770 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 771 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 772
 773 ifdef CONFIG_READABLE_ASM
 774 # Disable optimizations that make assembler listings hard to read.
 775 # reorder blocks reorders the control in the function
 776 # ipa clone creates specialized cloned functions
 777 # partial inlining inlines only parts of functions
 778 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 779                  $(call cc-option,-fno-ipa-cp-clone,) \
 780                  $(call cc-option,-fno-partial-inlining)
 781 endif
 782
 783 ifneq ($(CONFIG_FRAME_WARN),0)
 784 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 785 endif
 786
 787 stackp-flags-y                                    := -fno-stack-protector
 788 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 789 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 790
 791 KBUILD_CFLAGS += $(stackp-flags-y)
 792
 793 ifdef CONFIG_CC_IS_CLANG
 794 KBUILD_CPPFLAGS += -Qunused-arguments
 795 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 796 KBUILD_CFLAGS += -Wno-gnu
 797 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 798 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 799 # See modpost pattern 2
 800 KBUILD_CFLAGS += -mno-global-merge
 801 else
 802
 803 # Warn about unmarked fall-throughs in switch statement.
 804 # Disabled for clang while comment to attribute conversion happens and
 805 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 806 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,)
 807 endif
 808
 809 # These warnings generated too much noise in a regular build.
 810 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 811 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 812
 813 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 814 ifdef CONFIG_FRAME_POINTER
 815 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 816 else
 817 # Some targets (ARM with Thumb2, for example), can't be built with frame
 818 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 819 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 820 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 821 # -fomit-frame-pointer with FUNCTION_TRACER.
 822 ifndef CONFIG_FUNCTION_TRACER
 823 KBUILD_CFLAGS   += -fomit-frame-pointer
 824 endif
 825 endif
 826
 827 # Initialize all stack variables with a 0xAA pattern.
 828 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 829 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 830 endif
 831
 832 # Initialize all stack variables with a zero value.
 833 ifdef CONFIG_INIT_STACK_ALL_ZERO
 834 # Future support for zero initialization is still being debated, see
 835 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
 836 # renamed or dropped.
 837 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 838 KBUILD_CFLAGS   += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 839 endif
 840
 841 # While VLAs have been removed, GCC produces unreachable stack probes
 842 # for the randomize_kstack_offset feature. Disable it for all compilers.
 843 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 844
 845 DEBUG_CFLAGS    :=
 846
 847 # Workaround for GCC versions < 5.0
 848 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
 849 ifdef CONFIG_CC_IS_GCC
 850 DEBUG_CFLAGS    += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
 851 endif
 852
 853 ifdef CONFIG_DEBUG_INFO
 854
 855 ifdef CONFIG_DEBUG_INFO_SPLIT
 856 DEBUG_CFLAGS    += -gsplit-dwarf
 857 else
 858 DEBUG_CFLAGS    += -g
 859 endif
 860
 861 ifneq ($(LLVM_IAS),1)
 862 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 863 endif
 864
 865 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
 866 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
 867 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
 868 DEBUG_CFLAGS    += -gdwarf-$(dwarf-version-y)
 869 endif
 870
 871 ifdef CONFIG_DEBUG_INFO_REDUCED
 872 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 873                    $(call cc-option,-fno-var-tracking)
 874 endif
 875
 876 ifdef CONFIG_DEBUG_INFO_COMPRESSED
 877 DEBUG_CFLAGS    += -gz=zlib
 878 KBUILD_AFLAGS   += -gz=zlib
 879 KBUILD_LDFLAGS  += --compress-debug-sections=zlib
 880 endif
 881
 882 endif # CONFIG_DEBUG_INFO
 883
 884 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 885 export DEBUG_CFLAGS
 886
 887 ifdef CONFIG_FUNCTION_TRACER
 888 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 889   CC_FLAGS_FTRACE       += -mrecord-mcount
 890   ifdef CONFIG_HAVE_NOP_MCOUNT
 891     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 892       CC_FLAGS_FTRACE   += -mnop-mcount
 893       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 894     endif
 895   endif
 896 endif
 897 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 898   CC_FLAGS_USING        += -DCC_USING_NOP_MCOUNT
 899 endif
 900 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 901   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 902     BUILD_C_RECORDMCOUNT := y
 903     export BUILD_C_RECORDMCOUNT
 904   endif
 905 endif
 906 ifdef CONFIG_HAVE_FENTRY
 907   ifeq ($(call cc-option-yn, -mfentry),y)
 908     CC_FLAGS_FTRACE     += -mfentry
 909     CC_FLAGS_USING      += -DCC_USING_FENTRY
 910   endif
 911 endif
 912 export CC_FLAGS_FTRACE
 913 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 914 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 915 endif
 916
 917 # We trigger additional mismatches with less inlining
 918 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 919 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 920 endif
 921
 922 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 923 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 924 LDFLAGS_vmlinux += --gc-sections
 925 endif
 926
 927 ifdef CONFIG_SHADOW_CALL_STACK
 928 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 929 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 930 export CC_FLAGS_SCS
 931 endif
 932
 933 ifdef CONFIG_LTO_CLANG
 934 ifdef CONFIG_LTO_CLANG_THIN
 935 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 936 KBUILD_LDFLAGS  += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 937 else
 938 CC_FLAGS_LTO    := -flto
 939 endif
 940 CC_FLAGS_LTO    += -fvisibility=hidden
 941
 942 # Limit inlining across translation units to reduce binary size
 943 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 944
 945 # Check for frame size exceeding threshold during prolog/epilog insertion
 946 # when using lld < 13.0.0.
 947 ifneq ($(CONFIG_FRAME_WARN),0)
 948 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
 949 KBUILD_LDFLAGS  += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
 950 endif
 951 endif
 952 endif
 953
 954 ifdef CONFIG_LTO
 955 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
 956 KBUILD_AFLAGS   += -fno-lto
 957 export CC_FLAGS_LTO
 958 endif
 959
 960 ifdef CONFIG_CFI_CLANG
 961 CC_FLAGS_CFI    := -fsanitize=cfi \
 962                    -fsanitize-cfi-cross-dso \
 963                    -fno-sanitize-cfi-canonical-jump-tables \
 964                    -fno-sanitize-trap=cfi \
 965                    -fno-sanitize-blacklist
 966
 967 ifdef CONFIG_CFI_PERMISSIVE
 968 CC_FLAGS_CFI    += -fsanitize-recover=cfi
 969 endif
 970
 971 # If LTO flags are filtered out, we must also filter out CFI.
 972 CC_FLAGS_LTO    += $(CC_FLAGS_CFI)
 973 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
 974 export CC_FLAGS_CFI
 975 endif
 976
 977 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
 978 KBUILD_CFLAGS += -falign-functions=64
 979 endif
 980
 981 # arch Makefile may override CC so keep this after arch Makefile is included
 982 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 983
 984 # warn about C99 declaration after statement
 985 KBUILD_CFLAGS += -Wdeclaration-after-statement
 986
 987 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 988 KBUILD_CFLAGS += -Wvla
 989
 990 # disable pointer signed / unsigned warnings in gcc 4.0
 991 KBUILD_CFLAGS += -Wno-pointer-sign
 992
 993 # disable stringop warnings in gcc 8+
 994 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 995
 996 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 997 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 998 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 999 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1000
1001 # Another good warning that we'll want to enable eventually
1002 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1003
1004 # Enabled with W=2, disabled by default as noisy
1005 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
1006
1007 # disable invalid "can't wrap" optimizations for signed / pointers
1008 KBUILD_CFLAGS   += -fno-strict-overflow
1009
1010 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1011 KBUILD_CFLAGS  += -fno-stack-check
1012
1013 # conserve stack if available
1014 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
1015
1016 # Prohibit date/time macros, which would make the build non-deterministic
1017 KBUILD_CFLAGS   += -Werror=date-time
1018
1019 # enforce correct pointer usage
1020 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
1021
1022 # Require designated initializers for all marked structures
1023 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
1024
1025 # change __FILE__ to the relative path from the srctree
1026 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1027
1028 # include additional Makefiles when needed
1029 include-y                       := scripts/Makefile.extrawarn
1030 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1031 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1032 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1033 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1034 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1035
1036 include $(addprefix $(srctree)/, $(include-y))
1037
1038 # scripts/Makefile.gcc-plugins is intentionally included last.
1039 # Do not add $(call cc-option,...) below this line. When you build the kernel
1040 # from the clean source tree, the GCC plugins do not exist at this point.
1041
1042 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1043 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1044 KBUILD_AFLAGS   += $(KAFLAGS)
1045 KBUILD_CFLAGS   += $(KCFLAGS)
1046
1047 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1048 LDFLAGS_vmlinux += --build-id=sha1
1049
1050 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1051 LDFLAGS_vmlinux += $(call ld-option, -X,)
1052 endif
1053
1054 ifeq ($(CONFIG_RELR),y)
1055 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1056 endif
1057
1058 # We never want expected sections to be placed heuristically by the
1059 # linker. All sections should be explicitly named in the linker script.
1060 ifdef CONFIG_LD_ORPHAN_WARN
1061 LDFLAGS_vmlinux += --orphan-handling=warn
1062 endif
1063
1064 # Align the bit size of userspace programs with the kernel
1065 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1066 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1067
1068 # make the checker run with the right architecture
1069 CHECKFLAGS += --arch=$(ARCH)
1070
1071 # insure the checker run with the right endianness
1072 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1073
1074 # the checker needs the correct machine size
1075 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1076
1077 # Default kernel image to build when no specific target is given.
1078 # KBUILD_IMAGE may be overruled on the command line or
1079 # set in the environment
1080 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1081 # this default value
1082 export KBUILD_IMAGE ?= vmlinux
1083
1084 #
1085 # INSTALL_PATH specifies where to place the updated kernel and system map
1086 # images. Default is /boot, but you can set it to other values
1087 export  INSTALL_PATH ?= /boot
1088
1089 #
1090 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1091 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1092 # an argument if needed. Otherwise it defaults to the kernel install path
1093 #
1094 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1095
1096 #
1097 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1098 # relocations required by build roots.  This is not defined in the
1099 # makefile but the argument can be passed to make if needed.
1100 #
1101
1102 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1103 export MODLIB
1104
1105 PHONY += prepare0
1106
1107 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1108 export MODORDER := $(extmod_prefix)modules.order
1109 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1110
1111 ifeq ($(KBUILD_EXTMOD),)
1112 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1113
1114 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, \
1115                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1116                      $(libs-y) $(libs-m)))
1117
1118 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1119                      $(patsubst %/,%,$(filter %/, $(core-) \
1120                         $(drivers-) $(libs-))))
1121
1122 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1123                         $(core-y) $(core-m) $(libs-y) $(libs-m) \
1124                         $(drivers-y) $(drivers-m)))
1125
1126 build-dirs      := $(vmlinux-dirs)
1127 clean-dirs      := $(vmlinux-alldirs)
1128
1129 # Externally visible symbols (used by link-vmlinux.sh)
1130 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1131 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1132 ifdef CONFIG_MODULES
1133 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1134 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1135 else
1136 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1137 endif
1138 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1139
1140 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1141 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1142 # used by scripts/Makefile.package
1143 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1144
1145 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1146
1147 # Recurse until adjust_autoksyms.sh is satisfied
1148 PHONY += autoksyms_recursive
1149 ifdef CONFIG_TRIM_UNUSED_KSYMS
1150 # For the kernel to actually contain only the needed exported symbols,
1151 # we have to build modules as well to determine what those symbols are.
1152 # (this can be evaluated only once include/config/auto.conf has been included)
1153 KBUILD_MODULES := 1
1154
1155 autoksyms_recursive: descend modules.order
1156         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1157           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1158 endif
1159
1160 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1161
1162 quiet_cmd_autoksyms_h = GEN     $@
1163       cmd_autoksyms_h = mkdir -p $(dir $@); \
1164                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1165
1166 $(autoksyms_h):
1167         $(call cmd,autoksyms_h)
1168
1169 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1170
1171 # Final link of vmlinux with optional arch pass after final link
1172 cmd_link-vmlinux =                                                 \
1173         $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1174         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1175
1176 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1177         +$(call if_changed_dep,link-vmlinux)
1178
1179 targets := vmlinux
1180
1181 # The actual objects are generated when descending,
1182 # make sure no implicit rule kicks in
1183 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1184
1185 filechk_kernel.release = \
1186         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1187
1188 # Store (new) KERNELRELEASE string in include/config/kernel.release
1189 include/config/kernel.release: FORCE
1190         $(call filechk,kernel.release)
1191
1192 # Additional helpers built in scripts/
1193 # Carefully list dependencies so we do not try to build scripts twice
1194 # in parallel
1195 PHONY += scripts
1196 scripts: scripts_basic scripts_dtc
1197         $(Q)$(MAKE) $(build)=$(@)
1198
1199 # Things we need to do before we recursively start building the kernel
1200 # or the modules are listed in "prepare".
1201 # A multi level approach is used. prepareN is processed before prepareN-1.
1202 # archprepare is used in arch Makefiles and when processed asm symlink,
1203 # version.h and scripts_basic is processed / created.
1204
1205 PHONY += prepare archprepare
1206
1207 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1208         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1209         include/generated/autoconf.h remove-stale-files
1210
1211 prepare0: archprepare
1212         $(Q)$(MAKE) $(build)=scripts/mod
1213         $(Q)$(MAKE) $(build)=.
1214
1215 # All the preparing..
1216 prepare: prepare0
1217
1218 PHONY += remove-stale-files
1219 remove-stale-files:
1220         $(Q)$(srctree)/scripts/remove-stale-files
1221
1222 # Support for using generic headers in asm-generic
1223 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1224
1225 PHONY += asm-generic uapi-asm-generic
1226 asm-generic: uapi-asm-generic
1227         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1228         generic=include/asm-generic
1229 uapi-asm-generic:
1230         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1231         generic=include/uapi/asm-generic
1232
1233 # Generate some files
1234 # ---------------------------------------------------------------------------
1235
1236 # KERNELRELEASE can change from a few different places, meaning version.h
1237 # needs to be updated, so this check is forced on all builds
1238
1239 uts_len := 64
1240 define filechk_utsrelease.h
1241         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1242           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1243           exit 1;                                                         \
1244         fi;                                                               \
1245         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1246 endef
1247
1248 define filechk_version.h
1249         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1250                 echo \#define LINUX_VERSION_CODE $(shell                 \
1251                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1252         else                                                             \
1253                 echo \#define LINUX_VERSION_CODE $(shell                 \
1254                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1255         fi;                                                              \
1256         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1257         ((c) > 255 ? 255 : (c)))';                                       \
1258         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1259         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1260         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1261 endef
1262
1263 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1264 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1265 $(version_h): FORCE
1266         $(call filechk,version.h)
1267
1268 include/generated/utsrelease.h: include/config/kernel.release FORCE
1269         $(call filechk,utsrelease.h)
1270
1271 PHONY += headerdep
1272 headerdep:
1273         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1274         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1275
1276 # ---------------------------------------------------------------------------
1277 # Kernel headers
1278
1279 #Default location for installed headers
1280 export INSTALL_HDR_PATH = $(objtree)/usr
1281
1282 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1283       cmd_headers_install = \
1284         mkdir -p $(INSTALL_HDR_PATH); \
1285         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1286         usr/include $(INSTALL_HDR_PATH)
1287
1288 PHONY += headers_install
1289 headers_install: headers
1290         $(call cmd,headers_install)
1291
1292 PHONY += archheaders archscripts
1293
1294 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1295
1296 PHONY += headers
1297 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1298         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1299           $(error Headers not exportable for the $(SRCARCH) architecture))
1300         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1301         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1302
1303 # Deprecated. It is no-op now.
1304 PHONY += headers_check
1305 headers_check:
1306         @echo >&2 "=================== WARNING ==================="
1307         @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1308         @echo >&2 "and will be removed after Linux 5.15 release."
1309         @echo >&2 "Please remove headers_check from your scripts."
1310         @echo >&2 "==============================================="
1311
1312 ifdef CONFIG_HEADERS_INSTALL
1313 prepare: headers
1314 endif
1315
1316 PHONY += scripts_unifdef
1317 scripts_unifdef: scripts_basic
1318         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1319
1320 # ---------------------------------------------------------------------------
1321 # Install
1322
1323 # Many distributions have the custom install script, /sbin/installkernel.
1324 # If DKMS is installed, 'make install' will eventually recuses back
1325 # to the this Makefile to build and install external modules.
1326 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1327
1328 install: sub_make_done :=
1329
1330 # ---------------------------------------------------------------------------
1331 # Tools
1332
1333 ifdef CONFIG_STACK_VALIDATION
1334 prepare: tools/objtool
1335 endif
1336
1337 ifdef CONFIG_BPF
1338 ifdef CONFIG_DEBUG_INFO_BTF
1339 prepare: tools/bpf/resolve_btfids
1340 endif
1341 endif
1342
1343 PHONY += resolve_btfids_clean
1344
1345 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1346
1347 # tools/bpf/resolve_btfids directory might not exist
1348 # in output directory, skip its clean in that case
1349 resolve_btfids_clean:
1350 ifneq ($(wildcard $(resolve_btfids_O)),)
1351         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1352 endif
1353
1354 # Clear a bunch of variables before executing the submake
1355 ifeq ($(quiet),silent_)
1356 tools_silent=s
1357 endif
1358
1359 tools/: FORCE
1360         $(Q)mkdir -p $(objtree)/tools
1361         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1362
1363 tools/%: FORCE
1364         $(Q)mkdir -p $(objtree)/tools
1365         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1366
1367 # ---------------------------------------------------------------------------
1368 # Kernel selftest
1369
1370 PHONY += kselftest
1371 kselftest:
1372         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1373
1374 kselftest-%: FORCE
1375         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1376
1377 PHONY += kselftest-merge
1378 kselftest-merge:
1379         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1380         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1381                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1382         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1383
1384 # ---------------------------------------------------------------------------
1385 # Devicetree files
1386
1387 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1388 dtstree := arch/$(SRCARCH)/boot/dts
1389 endif
1390
1391 ifneq ($(dtstree),)
1392
1393 %.dtb: include/config/kernel.release scripts_dtc
1394         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1395
1396 %.dtbo: include/config/kernel.release scripts_dtc
1397         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1398
1399 PHONY += dtbs dtbs_install dtbs_check
1400 dtbs: include/config/kernel.release scripts_dtc
1401         $(Q)$(MAKE) $(build)=$(dtstree)
1402
1403 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1404 export CHECK_DTBS=y
1405 dtbs: dt_binding_check
1406 endif
1407
1408 dtbs_check: dtbs
1409
1410 dtbs_install:
1411         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1412
1413 ifdef CONFIG_OF_EARLY_FLATTREE
1414 all: dtbs
1415 endif
1416
1417 endif
1418
1419 PHONY += scripts_dtc
1420 scripts_dtc: scripts_basic
1421         $(Q)$(MAKE) $(build)=scripts/dtc
1422
1423 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1424 export CHECK_DT_BINDING=y
1425 endif
1426
1427 PHONY += dt_binding_check
1428 dt_binding_check: scripts_dtc
1429         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1430
1431 # ---------------------------------------------------------------------------
1432 # Modules
1433
1434 ifdef CONFIG_MODULES
1435
1436 # By default, build modules as well
1437
1438 all: modules
1439
1440 # When we're building modules with modversions, we need to consider
1441 # the built-in objects during the descend as well, in order to
1442 # make sure the checksums are up to date before we record them.
1443 ifdef CONFIG_MODVERSIONS
1444   KBUILD_BUILTIN := 1
1445 endif
1446
1447 # Build modules
1448 #
1449 # A module can be listed more than once in obj-m resulting in
1450 # duplicate lines in modules.order files.  Those are removed
1451 # using awk while concatenating to the final file.
1452
1453 PHONY += modules
1454 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1455
1456 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1457
1458 modules.order: $(subdir-modorder) FORCE
1459         $(call if_changed,modules_order)
1460
1461 targets += modules.order
1462
1463 # Target to prepare building external modules
1464 PHONY += modules_prepare
1465 modules_prepare: prepare
1466         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1467
1468 export modules_sign_only :=
1469
1470 ifeq ($(CONFIG_MODULE_SIG),y)
1471 PHONY += modules_sign
1472 modules_sign: modules_install
1473         @:
1474
1475 # modules_sign is a subset of modules_install.
1476 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1477 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1478 modules_sign_only := y
1479 endif
1480 endif
1481
1482 modinst_pre :=
1483 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1484 modinst_pre := __modinst_pre
1485 endif
1486
1487 modules_install: $(modinst_pre)
1488 PHONY += __modinst_pre
1489 __modinst_pre:
1490         @rm -rf $(MODLIB)/kernel
1491         @rm -f $(MODLIB)/source
1492         @mkdir -p $(MODLIB)/kernel
1493         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1494         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1495                 rm -f $(MODLIB)/build ; \
1496                 ln -s $(CURDIR) $(MODLIB)/build ; \
1497         fi
1498         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1499         @cp -f modules.builtin $(MODLIB)/
1500         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1501
1502 endif # CONFIG_MODULES
1503
1504 ###
1505 # Cleaning is done on three levels.
1506 # make clean     Delete most generated files
1507 #                Leave enough to build external modules
1508 # make mrproper  Delete the current configuration, and all generated files
1509 # make distclean Remove editor backup files, patch leftover files and the like
1510
1511 # Directories & files removed with 'make clean'
1512 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1513                modules.builtin modules.builtin.modinfo modules.nsdeps \
1514                compile_commands.json .thinlto-cache
1515
1516 # Directories & files removed with 'make mrproper'
1517 MRPROPER_FILES += include/config include/generated          \
1518                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1519                   debian snap tar-install \
1520                   .config .config.old .version \
1521                   Module.symvers \
1522                   certs/signing_key.pem certs/signing_key.x509 \
1523                   certs/x509.genkey \
1524                   vmlinux-gdb.py \
1525                   *.spec
1526
1527 # clean - Delete most, but leave enough to build external modules
1528 #
1529 clean: rm-files := $(CLEAN_FILES)
1530
1531 PHONY += archclean vmlinuxclean
1532
1533 vmlinuxclean:
1534         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1535         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1536
1537 clean: archclean vmlinuxclean resolve_btfids_clean
1538
1539 # mrproper - Delete all generated files, including .config
1540 #
1541 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1542 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1543
1544 PHONY += $(mrproper-dirs) mrproper
1545 $(mrproper-dirs):
1546         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1547
1548 mrproper: clean $(mrproper-dirs)
1549         $(call cmd,rmfiles)
1550
1551 # distclean
1552 #
1553 PHONY += distclean
1554
1555 distclean: mrproper
1556         @find . $(RCS_FIND_IGNORE) \
1557                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1558                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1559                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1560                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1561                 -type f -print | xargs rm -f
1562
1563
1564 # Packaging of the kernel to various formats
1565 # ---------------------------------------------------------------------------
1566
1567 %src-pkg: FORCE
1568         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1569 %pkg: include/config/kernel.release FORCE
1570         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1571
1572 # Brief documentation of the typical targets used
1573 # ---------------------------------------------------------------------------
1574
1575 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1576 boards := $(sort $(notdir $(boards)))
1577 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1578 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1579
1580 PHONY += help
1581 help:
1582         @echo  'Cleaning targets:'
1583         @echo  '  clean           - Remove most generated files but keep the config and'
1584         @echo  '                    enough build support to build external modules'
1585         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1586         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1587         @echo  ''
1588         @echo  'Configuration targets:'
1589         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1590         @echo  ''
1591         @echo  'Other generic targets:'
1592         @echo  '  all             - Build all targets marked with [*]'
1593         @echo  '* vmlinux         - Build the bare kernel'
1594         @echo  '* modules         - Build all modules'
1595         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1596         @echo  '  dir/            - Build all files in dir and below'
1597         @echo  '  dir/file.[ois]  - Build specified target only'
1598         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1599         @echo  '                    (requires compiler support for LLVM assembly generation)'
1600         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1601         @echo  '                    (requires a recent binutils and recent build (System.map))'
1602         @echo  '  dir/file.ko     - Build module including final link'
1603         @echo  '  modules_prepare - Set up for building external modules'
1604         @echo  '  tags/TAGS       - Generate tags file for editors'
1605         @echo  '  cscope          - Generate cscope index'
1606         @echo  '  gtags           - Generate GNU GLOBAL index'
1607         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1608         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1609         @echo  '  image_name      - Output the image name (use with make -s)'
1610         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1611          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1612          echo  ''
1613         @echo  'Static analysers:'
1614         @echo  '  checkstack      - Generate a list of stack hogs'
1615         @echo  '  versioncheck    - Sanity check on version.h usage'
1616         @echo  '  includecheck    - Check for duplicate included header files'
1617         @echo  '  export_report   - List the usages of all exported symbols'
1618         @echo  '  headerdep       - Detect inclusion cycles in headers'
1619         @echo  '  coccicheck      - Check with Coccinelle'
1620         @echo  '  clang-analyzer  - Check with clang static analyzer'
1621         @echo  '  clang-tidy      - Check with clang-tidy'
1622         @echo  ''
1623         @echo  'Tools:'
1624         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1625         @echo  ''
1626         @echo  'Kernel selftest:'
1627         @echo  '  kselftest         - Build and run kernel selftest'
1628         @echo  '                      Build, install, and boot kernel before'
1629         @echo  '                      running kselftest on it'
1630         @echo  '                      Run as root for full coverage'
1631         @echo  '  kselftest-all     - Build kernel selftest'
1632         @echo  '  kselftest-install - Build and install kernel selftest'
1633         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1634         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1635         @echo  '                      kselftest to existing .config.'
1636         @echo  ''
1637         @$(if $(dtstree), \
1638                 echo 'Devicetree:'; \
1639                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1640                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1641                 echo '  dt_binding_check - Validate device tree binding documents'; \
1642                 echo '  dtbs_check       - Validate device tree source files';\
1643                 echo '')
1644
1645         @echo 'Userspace tools targets:'
1646         @echo '  use "make tools/help"'
1647         @echo '  or  "cd tools; make help"'
1648         @echo  ''
1649         @echo  'Kernel packaging:'
1650         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1651         @echo  ''
1652         @echo  'Documentation targets:'
1653         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1654         @echo  ''
1655         @echo  'Architecture specific targets ($(SRCARCH)):'
1656         @$(if $(archhelp),$(archhelp),\
1657                 echo '  No architecture specific help defined for $(SRCARCH)')
1658         @echo  ''
1659         @$(if $(boards), \
1660                 $(foreach b, $(boards), \
1661                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1662                 echo '')
1663         @$(if $(board-dirs), \
1664                 $(foreach b, $(board-dirs), \
1665                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1666                 printf "  %-16s - Show all of the above\\n" help-boards; \
1667                 echo '')
1668
1669         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1670         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1671         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1672         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1673         @echo  '                       (sparse by default)'
1674         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1675         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1676         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1677         @echo  '                1: warnings which may be relevant and do not occur too often'
1678         @echo  '                2: warnings which occur quite often but may still be relevant'
1679         @echo  '                3: more obscure warnings, can most likely be ignored'
1680         @echo  '                Multiple levels can be combined with W=12 or W=123'
1681         @echo  ''
1682         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1683         @echo  'For further info see the ./README file'
1684
1685
1686 help-board-dirs := $(addprefix help-,$(board-dirs))
1687
1688 help-boards: $(help-board-dirs)
1689
1690 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1691
1692 $(help-board-dirs): help-%:
1693         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1694         @$(if $(boards-per-dir), \
1695                 $(foreach b, $(boards-per-dir), \
1696                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1697                 echo '')
1698
1699
1700 # Documentation targets
1701 # ---------------------------------------------------------------------------
1702 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1703                linkcheckdocs dochelp refcheckdocs
1704 PHONY += $(DOC_TARGETS)
1705 $(DOC_TARGETS):
1706         $(Q)$(MAKE) $(build)=Documentation $@
1707
1708 # Misc
1709 # ---------------------------------------------------------------------------
1710
1711 PHONY += scripts_gdb
1712 scripts_gdb: prepare0
1713         $(Q)$(MAKE) $(build)=scripts/gdb
1714         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1715
1716 ifdef CONFIG_GDB_SCRIPTS
1717 all: scripts_gdb
1718 endif
1719
1720 else # KBUILD_EXTMOD
1721
1722 ###
1723 # External module support.
1724 # When building external modules the kernel used as basis is considered
1725 # read-only, and no consistency checks are made and the make
1726 # system is not used on the basis kernel. If updates are required
1727 # in the basis kernel ordinary make commands (without M=...) must be used.
1728
1729 # We are always building only modules.
1730 KBUILD_BUILTIN :=
1731 KBUILD_MODULES := 1
1732
1733 build-dirs := $(KBUILD_EXTMOD)
1734 $(MODORDER): descend
1735         @:
1736
1737 compile_commands.json: $(extmod_prefix)compile_commands.json
1738 PHONY += compile_commands.json
1739
1740 clean-dirs := $(KBUILD_EXTMOD)
1741 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1742         $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1743
1744 PHONY += help
1745 help:
1746         @echo  '  Building external modules.'
1747         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1748         @echo  ''
1749         @echo  '  modules         - default target, build the module(s)'
1750         @echo  '  modules_install - install the module'
1751         @echo  '  clean           - remove generated files in module directory only'
1752         @echo  ''
1753
1754 # no-op for external module builds
1755 PHONY += prepare modules_prepare
1756
1757 endif # KBUILD_EXTMOD
1758
1759 # ---------------------------------------------------------------------------
1760 # Modules
1761
1762 PHONY += modules modules_install
1763
1764 ifdef CONFIG_MODULES
1765
1766 modules: modules_check
1767         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1768
1769 PHONY += modules_check
1770 modules_check: $(MODORDER)
1771         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1772
1773 quiet_cmd_depmod = DEPMOD  $(MODLIB)
1774       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1775                    $(KERNELRELEASE)
1776
1777 modules_install:
1778         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1779         $(call cmd,depmod)
1780
1781 else # CONFIG_MODULES
1782
1783 # Modules not configured
1784 # ---------------------------------------------------------------------------
1785
1786 modules modules_install:
1787         @echo >&2 '***'
1788         @echo >&2 '*** The present kernel configuration has modules disabled.'
1789         @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1790         @echo >&2 '*** to enable CONFIG_MODULES.'
1791         @echo >&2 '***'
1792         @exit 1
1793
1794 endif # CONFIG_MODULES
1795
1796 # Single targets
1797 # ---------------------------------------------------------------------------
1798 # To build individual files in subdirectories, you can do like this:
1799 #
1800 #   make foo/bar/baz.s
1801 #
1802 # The supported suffixes for single-target are listed in 'single-targets'
1803 #
1804 # To build only under specific subdirectories, you can do like this:
1805 #
1806 #   make foo/bar/baz/
1807
1808 ifdef single-build
1809
1810 # .ko is special because modpost is needed
1811 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1812 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1813
1814 $(single-ko): single_modpost
1815         @:
1816 $(single-no-ko): descend
1817         @:
1818
1819 ifeq ($(KBUILD_EXTMOD),)
1820 # For the single build of in-tree modules, use a temporary file to avoid
1821 # the situation of modules_install installing an invalid modules.order.
1822 MODORDER := .modules.tmp
1823 endif
1824
1825 PHONY += single_modpost
1826 single_modpost: $(single-no-ko) modules_prepare
1827         $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1828         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1829
1830 KBUILD_MODULES := 1
1831
1832 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1833
1834 # trim unrelated directories
1835 build-dirs := $(foreach d, $(build-dirs), \
1836                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1837
1838 endif
1839
1840 ifndef CONFIG_MODULES
1841 KBUILD_MODULES :=
1842 endif
1843
1844 # Handle descending into subdirectories listed in $(build-dirs)
1845 # Preset locale variables to speed up the build process. Limit locale
1846 # tweaks to this spot to avoid wrong language settings when running
1847 # make menuconfig etc.
1848 # Error messages still appears in the original language
1849 PHONY += descend $(build-dirs)
1850 descend: $(build-dirs)
1851 $(build-dirs): prepare
1852         $(Q)$(MAKE) $(build)=$@ \
1853         single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1854         need-builtin=1 need-modorder=1
1855
1856 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1857 PHONY += $(clean-dirs) clean
1858 $(clean-dirs):
1859         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1860
1861 clean: $(clean-dirs)
1862         $(call cmd,rmfiles)
1863         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1864                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1865                 -o -name '*.ko.*' \
1866                 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1867                 -o -name '*.dwo' -o -name '*.lst' \
1868                 -o -name '*.su' -o -name '*.mod' \
1869                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1870                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1871                 -o -name '*.asn1.[ch]' \
1872                 -o -name '*.symtypes' -o -name 'modules.order' \
1873                 -o -name '.tmp_*.o.*' \
1874                 -o -name '*.c.[012]*.*' \
1875                 -o -name '*.ll' \
1876                 -o -name '*.gcno' \
1877                 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1878
1879 # Generate tags for editors
1880 # ---------------------------------------------------------------------------
1881 quiet_cmd_tags = GEN     $@
1882       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1883
1884 tags TAGS cscope gtags: FORCE
1885         $(call cmd,tags)
1886
1887 # Script to generate missing namespace dependencies
1888 # ---------------------------------------------------------------------------
1889
1890 PHONY += nsdeps
1891 nsdeps: export KBUILD_NSDEPS=1
1892 nsdeps: modules
1893         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1894
1895 # Clang Tooling
1896 # ---------------------------------------------------------------------------
1897
1898 quiet_cmd_gen_compile_commands = GEN     $@
1899       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1900
1901 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1902         $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1903         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1904         $(call if_changed,gen_compile_commands)
1905
1906 targets += $(extmod_prefix)compile_commands.json
1907
1908 PHONY += clang-tidy clang-analyzer
1909
1910 ifdef CONFIG_CC_IS_CLANG
1911 quiet_cmd_clang_tools = CHECK   $<
1912       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1913
1914 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1915         $(call cmd,clang_tools)
1916 else
1917 clang-tidy clang-analyzer:
1918         @echo "$@ requires CC=clang" >&2
1919         @false
1920 endif
1921
1922 # Scripts to check various things for consistency
1923 # ---------------------------------------------------------------------------
1924
1925 PHONY += includecheck versioncheck coccicheck export_report
1926
1927 includecheck:
1928         find $(srctree)/* $(RCS_FIND_IGNORE) \
1929                 -name '*.[hcS]' -type f -print | sort \
1930                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1931
1932 versioncheck:
1933         find $(srctree)/* $(RCS_FIND_IGNORE) \
1934                 -name '*.[hcS]' -type f -print | sort \
1935                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1936
1937 coccicheck:
1938         $(Q)$(BASH) $(srctree)/scripts/$@
1939
1940 export_report:
1941         $(PERL) $(srctree)/scripts/export_report.pl
1942
1943 PHONY += checkstack kernelrelease kernelversion image_name
1944
1945 # UML needs a little special treatment here.  It wants to use the host
1946 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1947 # else wants $(ARCH), including people doing cross-builds, which means
1948 # that $(SUBARCH) doesn't work here.
1949 ifeq ($(ARCH), um)
1950 CHECKSTACK_ARCH := $(SUBARCH)
1951 else
1952 CHECKSTACK_ARCH := $(ARCH)
1953 endif
1954 checkstack:
1955         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1956         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1957
1958 kernelrelease:
1959         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1960
1961 kernelversion:
1962         @echo $(KERNELVERSION)
1963
1964 image_name:
1965         @echo $(KBUILD_IMAGE)
1966
1967 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1968       cmd_rmfiles = rm -rf $(rm-files)
1969
1970 # read saved command lines for existing targets
1971 existing-targets := $(wildcard $(sort $(targets)))
1972
1973 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1974
1975 endif # config-build
1976 endif # mixed-build
1977 endif # need-sub-make
1978
1979 PHONY += FORCE
1980 FORCE:
1981
1982 # Declare the contents of the PHONY variable as phony.  We keep that
1983 # information in a variable so we can use it in if_changed and friends.
1984 .PHONY: $(PHONY)