Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 6
   3 PATCHLEVEL = 1
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc4
   6 NAME = Hurr durr I'ma ninja sloth
   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 = $(C)
 116 endif
 117 ifndef KBUILD_CHECKSRC
 118   KBUILD_CHECKSRC = 0
 119 endif
 120
 121 export KBUILD_CHECKSRC
 122
 123 # Enable "clippy" (a linter) as part of the Rust compilation.
 124 #
 125 # Use 'make CLIPPY=1' to enable it.
 126 ifeq ("$(origin CLIPPY)", "command line")
 127   KBUILD_CLIPPY := $(CLIPPY)
 128 endif
 129
 130 export KBUILD_CLIPPY
 131
 132 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 133 # directory of external module to build. Setting M= takes precedence.
 134 ifeq ("$(origin M)", "command line")
 135   KBUILD_EXTMOD := $(M)
 136 endif
 137
 138 $(if $(word 2, $(KBUILD_EXTMOD)), \
 139         $(error building multiple external modules is not supported))
 140
 141 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
 142         $(error module directory path cannot contain '$x')))
 143
 144 # Remove trailing slashes
 145 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 146 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 147 endif
 148
 149 export KBUILD_EXTMOD
 150
 151 # Kbuild will save output files in the current working directory.
 152 # This does not need to match to the root of the kernel source tree.
 153 #
 154 # For example, you can do this:
 155 #
 156 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 157 #
 158 # If you want to save output files in a different location, there are
 159 # two syntaxes to specify it.
 160 #
 161 # 1) O=
 162 # Use "make O=dir/to/store/output/files/"
 163 #
 164 # 2) Set KBUILD_OUTPUT
 165 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 166 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 167 #
 168 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 169 # variable.
 170
 171 # Do we want to change the working directory?
 172 ifeq ("$(origin O)", "command line")
 173   KBUILD_OUTPUT := $(O)
 174 endif
 175
 176 ifneq ($(KBUILD_OUTPUT),)
 177 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 178 # expand a shell special character '~'. We use a somewhat tedious way here.
 179 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 180 $(if $(abs_objtree),, \
 181      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 182
 183 # $(realpath ...) resolves symlinks
 184 abs_objtree := $(realpath $(abs_objtree))
 185 else
 186 abs_objtree := $(CURDIR)
 187 endif # ifneq ($(KBUILD_OUTPUT),)
 188
 189 ifeq ($(abs_objtree),$(CURDIR))
 190 # Suppress "Entering directory ..." unless we are changing the work directory.
 191 MAKEFLAGS += --no-print-directory
 192 else
 193 need-sub-make := 1
 194 endif
 195
 196 this-makefile := $(lastword $(MAKEFILE_LIST))
 197 abs_srctree := $(realpath $(dir $(this-makefile)))
 198
 199 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 200 $(error source directory cannot contain spaces or colons)
 201 endif
 202
 203 ifneq ($(abs_srctree),$(abs_objtree))
 204 # Look for make include files relative to root of kernel src
 205 #
 206 # --included-dir is added for backward compatibility, but you should not rely on
 207 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
 208 MAKEFLAGS += --include-dir=$(abs_srctree)
 209 endif
 210
 211 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 212 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 213 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 214 need-sub-make := 1
 215 # Cancel implicit rules for this Makefile.
 216 $(this-makefile): ;
 217 endif
 218
 219 export abs_srctree abs_objtree
 220 export sub_make_done := 1
 221
 222 ifeq ($(need-sub-make),1)
 223
 224 PHONY += $(MAKECMDGOALS) __sub-make
 225
 226 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 227         @:
 228
 229 # Invoke a second make in the output directory, passing relevant variables
 230 __sub-make:
 231         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 232
 233 endif # need-sub-make
 234 endif # sub_make_done
 235
 236 # We process the rest of the Makefile if this is the final invocation of make
 237 ifeq ($(need-sub-make),)
 238
 239 # Do not print "Entering directory ...",
 240 # but we want to display it when entering to the output directory
 241 # so that IDEs/editors are able to understand relative filenames.
 242 MAKEFLAGS += --no-print-directory
 243
 244 ifeq ($(abs_srctree),$(abs_objtree))
 245         # building in the source tree
 246         srctree := .
 247         building_out_of_srctree :=
 248 else
 249         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 250                 # building in a subdirectory of the source tree
 251                 srctree := ..
 252         else
 253                 srctree := $(abs_srctree)
 254         endif
 255         building_out_of_srctree := 1
 256 endif
 257
 258 ifneq ($(KBUILD_ABS_SRCTREE),)
 259 srctree := $(abs_srctree)
 260 endif
 261
 262 objtree         := .
 263 VPATH           := $(srctree)
 264
 265 export building_out_of_srctree srctree objtree VPATH
 266
 267 # To make sure we do not include .config for any of the *config targets
 268 # catch them early, and hand them over to scripts/kconfig/Makefile
 269 # It is allowed to specify more targets when calling make, including
 270 # mixing *config targets and build targets.
 271 # For example 'make oldconfig all'.
 272 # Detect when mixed targets is specified, and make a second invocation
 273 # of make so .config is not included in this case either (for *config).
 274
 275 version_h := include/generated/uapi/linux/version.h
 276
 277 clean-targets := %clean mrproper cleandocs
 278 no-dot-config-targets := $(clean-targets) \
 279                          cscope gtags TAGS tags help% %docs check% coccicheck \
 280                          $(version_h) headers headers_% archheaders archscripts \
 281                          %asm-generic kernelversion %src-pkg dt_binding_check \
 282                          outputmakefile rustavailable rustfmt rustfmtcheck
 283 # Installation targets should not require compiler. Unfortunately, vdso_install
 284 # is an exception where build artifacts may be updated. This must be fixed.
 285 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
 286                         headers_install modules_install kernelrelease image_name
 287 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
 288                           image_name
 289 single-targets := %.a %.i %.rsi %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 290
 291 config-build    :=
 292 mixed-build     :=
 293 need-config     := 1
 294 need-compiler   := 1
 295 may-sync-config := 1
 296 single-build    :=
 297
 298 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 299         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 300                 need-config :=
 301         endif
 302 endif
 303
 304 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
 305         ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
 306                 need-compiler :=
 307         endif
 308 endif
 309
 310 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 311         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 312                 may-sync-config :=
 313         endif
 314 endif
 315
 316 ifneq ($(KBUILD_EXTMOD),)
 317         may-sync-config :=
 318 endif
 319
 320 ifeq ($(KBUILD_EXTMOD),)
 321         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 322                 config-build := 1
 323                 ifneq ($(words $(MAKECMDGOALS)),1)
 324                         mixed-build := 1
 325                 endif
 326         endif
 327 endif
 328
 329 # We cannot build single targets and the others at the same time
 330 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 331         single-build := 1
 332         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 333                 mixed-build := 1
 334         endif
 335 endif
 336
 337 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 338 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 339         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 340                 mixed-build := 1
 341         endif
 342 endif
 343
 344 # install and modules_install need also be processed one by one
 345 ifneq ($(filter install,$(MAKECMDGOALS)),)
 346         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 347                 mixed-build := 1
 348         endif
 349 endif
 350
 351 ifdef mixed-build
 352 # ===========================================================================
 353 # We're called with mixed targets (*config and build targets).
 354 # Handle them one by one.
 355
 356 PHONY += $(MAKECMDGOALS) __build_one_by_one
 357
 358 $(MAKECMDGOALS): __build_one_by_one
 359         @:
 360
 361 __build_one_by_one:
 362         $(Q)set -e; \
 363         for i in $(MAKECMDGOALS); do \
 364                 $(MAKE) -f $(srctree)/Makefile $$i; \
 365         done
 366
 367 else # !mixed-build
 368
 369 include $(srctree)/scripts/Kbuild.include
 370
 371 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 372 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 373 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 374 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 375
 376 include $(srctree)/scripts/subarch.include
 377
 378 # Cross compiling and selecting different set of gcc/bin-utils
 379 # ---------------------------------------------------------------------------
 380 #
 381 # When performing cross compilation for other architectures ARCH shall be set
 382 # to the target architecture. (See arch/* for the possibilities).
 383 # ARCH can be set during invocation of make:
 384 # make ARCH=ia64
 385 # Another way is to have ARCH set in the environment.
 386 # The default ARCH is the host where make is executed.
 387
 388 # CROSS_COMPILE specify the prefix used for all executables used
 389 # during compilation. Only gcc and related bin-utils executables
 390 # are prefixed with $(CROSS_COMPILE).
 391 # CROSS_COMPILE can be set on the command line
 392 # make CROSS_COMPILE=ia64-linux-
 393 # Alternatively CROSS_COMPILE can be set in the environment.
 394 # Default value for CROSS_COMPILE is not to prefix executables
 395 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 396 ARCH            ?= $(SUBARCH)
 397
 398 # Architecture as present in compile.h
 399 UTS_MACHINE     := $(ARCH)
 400 SRCARCH         := $(ARCH)
 401
 402 # Additional ARCH settings for x86
 403 ifeq ($(ARCH),i386)
 404         SRCARCH := x86
 405 endif
 406 ifeq ($(ARCH),x86_64)
 407         SRCARCH := x86
 408 endif
 409
 410 # Additional ARCH settings for sparc
 411 ifeq ($(ARCH),sparc32)
 412        SRCARCH := sparc
 413 endif
 414 ifeq ($(ARCH),sparc64)
 415        SRCARCH := sparc
 416 endif
 417
 418 # Additional ARCH settings for parisc
 419 ifeq ($(ARCH),parisc64)
 420        SRCARCH := parisc
 421 endif
 422
 423 export cross_compiling :=
 424 ifneq ($(SRCARCH),$(SUBARCH))
 425 cross_compiling := 1
 426 endif
 427
 428 KCONFIG_CONFIG  ?= .config
 429 export KCONFIG_CONFIG
 430
 431 # SHELL used by kbuild
 432 CONFIG_SHELL := sh
 433
 434 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 435 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 436 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 437
 438 ifneq ($(LLVM),)
 439 ifneq ($(filter %/,$(LLVM)),)
 440 LLVM_PREFIX := $(LLVM)
 441 else ifneq ($(filter -%,$(LLVM)),)
 442 LLVM_SUFFIX := $(LLVM)
 443 endif
 444
 445 HOSTCC  = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 446 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 447 else
 448 HOSTCC  = gcc
 449 HOSTCXX = g++
 450 endif
 451 HOSTRUSTC = rustc
 452 HOSTPKG_CONFIG  = pkg-config
 453
 454 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 455                          -O2 -fomit-frame-pointer -std=gnu11 \
 456                          -Wdeclaration-after-statement
 457 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 458 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 459
 460 # These flags apply to all Rust code in the tree, including the kernel and
 461 # host programs.
 462 export rust_common_flags := --edition=2021 \
 463                             -Zbinary_dep_depinfo=y \
 464                             -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
 465                             -Dunreachable_pub -Dnon_ascii_idents \
 466                             -Wmissing_docs \
 467                             -Drustdoc::missing_crate_level_docs \
 468                             -Dclippy::correctness -Dclippy::style \
 469                             -Dclippy::suspicious -Dclippy::complexity \
 470                             -Dclippy::perf \
 471                             -Dclippy::let_unit_value -Dclippy::mut_mut \
 472                             -Dclippy::needless_bitwise_bool \
 473                             -Dclippy::needless_continue \
 474                             -Wclippy::dbg_macro
 475
 476 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 477 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 478 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 479                         -Zallow-features= $(HOSTRUSTFLAGS)
 480 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 481 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 482
 483 # Make variables (CC, etc...)
 484 CPP             = $(CC) -E
 485 ifneq ($(LLVM),)
 486 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 487 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 488 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 489 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 490 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 491 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 492 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 493 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 494 else
 495 CC              = $(CROSS_COMPILE)gcc
 496 LD              = $(CROSS_COMPILE)ld
 497 AR              = $(CROSS_COMPILE)ar
 498 NM              = $(CROSS_COMPILE)nm
 499 OBJCOPY         = $(CROSS_COMPILE)objcopy
 500 OBJDUMP         = $(CROSS_COMPILE)objdump
 501 READELF         = $(CROSS_COMPILE)readelf
 502 STRIP           = $(CROSS_COMPILE)strip
 503 endif
 504 RUSTC           = rustc
 505 RUSTDOC         = rustdoc
 506 RUSTFMT         = rustfmt
 507 CLIPPY_DRIVER   = clippy-driver
 508 BINDGEN         = bindgen
 509 CARGO           = cargo
 510 PAHOLE          = pahole
 511 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 512 LEX             = flex
 513 YACC            = bison
 514 AWK             = awk
 515 INSTALLKERNEL  := installkernel
 516 DEPMOD          = depmod
 517 PERL            = perl
 518 PYTHON3         = python3
 519 CHECK           = sparse
 520 BASH            = bash
 521 KGZIP           = gzip
 522 KBZIP2          = bzip2
 523 KLZOP           = lzop
 524 LZMA            = lzma
 525 LZ4             = lz4c
 526 XZ              = xz
 527 ZSTD            = zstd
 528
 529 PAHOLE_FLAGS    = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
 530
 531 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 532                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 533 NOSTDINC_FLAGS :=
 534 CFLAGS_MODULE   =
 535 RUSTFLAGS_MODULE =
 536 AFLAGS_MODULE   =
 537 LDFLAGS_MODULE  =
 538 CFLAGS_KERNEL   =
 539 RUSTFLAGS_KERNEL =
 540 AFLAGS_KERNEL   =
 541 export LDFLAGS_vmlinux =
 542
 543 # Use USERINCLUDE when you must reference the UAPI directories only.
 544 USERINCLUDE    := \
 545                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 546                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 547                 -I$(srctree)/include/uapi \
 548                 -I$(objtree)/include/generated/uapi \
 549                 -include $(srctree)/include/linux/compiler-version.h \
 550                 -include $(srctree)/include/linux/kconfig.h
 551
 552 # Use LINUXINCLUDE when you must reference the include/ directory.
 553 # Needed to be compatible with the O= option
 554 LINUXINCLUDE    := \
 555                 -I$(srctree)/arch/$(SRCARCH)/include \
 556                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 557                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 558                 -I$(objtree)/include \
 559                 $(USERINCLUDE)
 560
 561 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 562 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 563                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 564                    -Werror=implicit-function-declaration -Werror=implicit-int \
 565                    -Werror=return-type -Wno-format-security \
 566                    -std=gnu11
 567 KBUILD_CPPFLAGS := -D__KERNEL__
 568 KBUILD_RUSTFLAGS := $(rust_common_flags) \
 569                     --target=$(objtree)/rust/target.json \
 570                     -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 571                     -Cforce-unwind-tables=n -Ccodegen-units=1 \
 572                     -Csymbol-mangling-version=v0 \
 573                     -Crelocation-model=static \
 574                     -Zfunction-sections=n \
 575                     -Dclippy::float_arithmetic
 576
 577 KBUILD_AFLAGS_KERNEL :=
 578 KBUILD_CFLAGS_KERNEL :=
 579 KBUILD_RUSTFLAGS_KERNEL :=
 580 KBUILD_AFLAGS_MODULE  := -DMODULE
 581 KBUILD_CFLAGS_MODULE  := -DMODULE
 582 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 583 KBUILD_LDFLAGS_MODULE :=
 584 KBUILD_LDFLAGS :=
 585 CLANG_FLAGS :=
 586
 587 ifeq ($(KBUILD_CLIPPY),1)
 588         RUSTC_OR_CLIPPY_QUIET := CLIPPY
 589         RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 590 else
 591         RUSTC_OR_CLIPPY_QUIET := RUSTC
 592         RUSTC_OR_CLIPPY = $(RUSTC)
 593 endif
 594
 595 ifdef RUST_LIB_SRC
 596         export RUST_LIB_SRC
 597 endif
 598
 599 # Allows the usage of unstable features in stable compilers.
 600 export RUSTC_BOOTSTRAP := 1
 601
 602 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 603 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
 604 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 605 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 606 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 607 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 608 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 609 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 610
 611 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 612 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 613 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 614 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 615 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 616 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 617 export PAHOLE_FLAGS
 618
 619 # Files to ignore in find ... statements
 620
 621 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 622                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 623                           -prune -o
 624 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 625                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 626
 627 # ===========================================================================
 628 # Rules shared between *config targets and build targets
 629
 630 # Basic helpers built in scripts/basic/
 631 PHONY += scripts_basic
 632 scripts_basic:
 633         $(Q)$(MAKE) $(build)=scripts/basic
 634
 635 PHONY += outputmakefile
 636 ifdef building_out_of_srctree
 637 # Before starting out-of-tree build, make sure the source tree is clean.
 638 # outputmakefile generates a Makefile in the output directory, if using a
 639 # separate output directory. This allows convenient use of make in the
 640 # output directory.
 641 # At the same time when output Makefile generated, generate .gitignore to
 642 # ignore whole output directory
 643
 644 quiet_cmd_makefile = GEN     Makefile
 645       cmd_makefile = { \
 646         echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 647         echo "include $(srctree)/Makefile"; \
 648         } > Makefile
 649
 650 outputmakefile:
 651         @if [ -f $(srctree)/.config -o \
 652                  -d $(srctree)/include/config -o \
 653                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 654                 echo >&2 "***"; \
 655                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 656                 echo >&2 "*** in $(abs_srctree)";\
 657                 echo >&2 "***"; \
 658                 false; \
 659         fi
 660         $(Q)ln -fsn $(srctree) source
 661         $(call cmd,makefile)
 662         $(Q)test -e .gitignore || \
 663         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 664 endif
 665
 666 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 667 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 668 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 669 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 670 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 671
 672 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 673 include $(srctree)/scripts/Makefile.clang
 674 endif
 675
 676 # Include this also for config targets because some architectures need
 677 # cc-cross-prefix to determine CROSS_COMPILE.
 678 ifdef need-compiler
 679 include $(srctree)/scripts/Makefile.compiler
 680 endif
 681
 682 ifdef config-build
 683 # ===========================================================================
 684 # *config targets only - make sure prerequisites are updated, and descend
 685 # in scripts/kconfig to make the *config target
 686
 687 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 688 # KBUILD_DEFCONFIG may point out an alternative default configuration
 689 # used for 'make defconfig'
 690 include $(srctree)/arch/$(SRCARCH)/Makefile
 691 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 692
 693 config: outputmakefile scripts_basic FORCE
 694         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 695
 696 %config: outputmakefile scripts_basic FORCE
 697         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 698
 699 else #!config-build
 700 # ===========================================================================
 701 # Build targets only - this includes vmlinux, arch specific targets, clean
 702 # targets and others. In general all targets except *config targets.
 703
 704 # If building an external module we do not care about the all: rule
 705 # but instead __all depend on modules
 706 PHONY += all
 707 ifeq ($(KBUILD_EXTMOD),)
 708 __all: all
 709 else
 710 __all: modules
 711 endif
 712
 713 targets :=
 714
 715 # Decide whether to build built-in, modular, or both.
 716 # Normally, just do built-in.
 717
 718 KBUILD_MODULES :=
 719 KBUILD_BUILTIN := 1
 720
 721 # If we have only "make modules", don't compile built-in objects.
 722 ifeq ($(MAKECMDGOALS),modules)
 723   KBUILD_BUILTIN :=
 724 endif
 725
 726 # If we have "make <whatever> modules", compile modules
 727 # in addition to whatever we do anyway.
 728 # Just "make" or "make all" shall build modules as well
 729
 730 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 731   KBUILD_MODULES := 1
 732 endif
 733
 734 ifeq ($(MAKECMDGOALS),)
 735   KBUILD_MODULES := 1
 736 endif
 737
 738 export KBUILD_MODULES KBUILD_BUILTIN
 739
 740 ifdef need-config
 741 include include/config/auto.conf
 742 endif
 743
 744 ifeq ($(KBUILD_EXTMOD),)
 745 # Objects we will link into vmlinux / subdirs we need to visit
 746 core-y          :=
 747 drivers-y       :=
 748 libs-y          := lib/
 749 endif # KBUILD_EXTMOD
 750
 751 # The all: target is the default when no target is given on the
 752 # command line.
 753 # This allow a user to issue only 'make' to build a kernel including modules
 754 # Defaults to vmlinux, but the arch makefile usually adds further targets
 755 all: vmlinux
 756
 757 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 758 ifdef CONFIG_CC_IS_GCC
 759 CFLAGS_GCOV     += -fno-tree-loop-im
 760 endif
 761 export CFLAGS_GCOV
 762
 763 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 764 ifdef CONFIG_FUNCTION_TRACER
 765   CC_FLAGS_FTRACE := -pg
 766 endif
 767
 768 include $(srctree)/arch/$(SRCARCH)/Makefile
 769
 770 ifdef need-config
 771 ifdef may-sync-config
 772 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 773 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 774 # because some architectures define CROSS_COMPILE there.
 775 include include/config/auto.conf.cmd
 776
 777 $(KCONFIG_CONFIG):
 778         @echo >&2 '***'
 779         @echo >&2 '*** Configuration file "$@" not found!'
 780         @echo >&2 '***'
 781         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 782         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 783         @echo >&2 '***'
 784         @/bin/false
 785
 786 # The actual configuration files used during the build are stored in
 787 # include/generated/ and include/config/. Update them if .config is newer than
 788 # include/config/auto.conf (which mirrors .config).
 789 #
 790 # This exploits the 'multi-target pattern rule' trick.
 791 # The syncconfig should be executed only once to make all the targets.
 792 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 793 #
 794 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 795 # so you cannot notice that Kconfig is waiting for the user input.
 796 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 797         $(Q)$(kecho) "  SYNC    $@"
 798         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 799 else # !may-sync-config
 800 # External modules and some install targets need include/generated/autoconf.h
 801 # and include/config/auto.conf but do not care if they are up-to-date.
 802 # Use auto.conf to trigger the test
 803 PHONY += include/config/auto.conf
 804
 805 include/config/auto.conf:
 806         @test -e include/generated/autoconf.h -a -e $@ || (             \
 807         echo >&2;                                                       \
 808         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 809         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 810         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 811         echo >&2 ;                                                      \
 812         /bin/false)
 813
 814 endif # may-sync-config
 815 endif # need-config
 816
 817 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 818 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 819 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 820 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 821 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 822
 823 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 824 KBUILD_CFLAGS += -O2
 825 KBUILD_RUSTFLAGS += -Copt-level=2
 826 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 827 KBUILD_CFLAGS += -Os
 828 KBUILD_RUSTFLAGS += -Copt-level=s
 829 endif
 830
 831 # Always set `debug-assertions` and `overflow-checks` because their default
 832 # depends on `opt-level` and `debug-assertions`, respectively.
 833 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 834 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 835
 836 # Tell gcc to never replace conditional load with a non-conditional one
 837 ifdef CONFIG_CC_IS_GCC
 838 # gcc-10 renamed --param=allow-store-data-races=0 to
 839 # -fno-allow-store-data-races.
 840 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 841 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 842 endif
 843
 844 ifdef CONFIG_READABLE_ASM
 845 # Disable optimizations that make assembler listings hard to read.
 846 # reorder blocks reorders the control in the function
 847 # ipa clone creates specialized cloned functions
 848 # partial inlining inlines only parts of functions
 849 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 850 endif
 851
 852 ifneq ($(CONFIG_FRAME_WARN),0)
 853 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 854 endif
 855
 856 stackp-flags-y                                    := -fno-stack-protector
 857 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 858 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 859
 860 KBUILD_CFLAGS += $(stackp-flags-y)
 861
 862 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
 863 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
 864
 865 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 866 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 867
 868 ifdef CONFIG_CC_IS_CLANG
 869 KBUILD_CPPFLAGS += -Qunused-arguments
 870 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
 871 KBUILD_CFLAGS += -Wno-gnu
 872 else
 873
 874 # gcc inanely warns about local variables called 'main'
 875 KBUILD_CFLAGS += -Wno-main
 876 endif
 877
 878 # These warnings generated too much noise in a regular build.
 879 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 880 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 881 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 882
 883 # These result in bogus false positives
 884 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
 885
 886 ifdef CONFIG_FRAME_POINTER
 887 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 888 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 889 else
 890 # Some targets (ARM with Thumb2, for example), can't be built with frame
 891 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 892 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 893 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 894 # -fomit-frame-pointer with FUNCTION_TRACER.
 895 # In the Rust target specification, "frame-pointer" is set explicitly
 896 # to "may-omit".
 897 ifndef CONFIG_FUNCTION_TRACER
 898 KBUILD_CFLAGS   += -fomit-frame-pointer
 899 endif
 900 endif
 901
 902 # Initialize all stack variables with a 0xAA pattern.
 903 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 904 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 905 endif
 906
 907 # Initialize all stack variables with a zero value.
 908 ifdef CONFIG_INIT_STACK_ALL_ZERO
 909 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 910 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 911 # https://github.com/llvm/llvm-project/issues/44842
 912 KBUILD_CFLAGS   += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 913 endif
 914 endif
 915
 916 # While VLAs have been removed, GCC produces unreachable stack probes
 917 # for the randomize_kstack_offset feature. Disable it for all compilers.
 918 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 919
 920 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 921 ifdef CONFIG_ZERO_CALL_USED_REGS
 922 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 923 endif
 924
 925 ifdef CONFIG_FUNCTION_TRACER
 926 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 927   CC_FLAGS_FTRACE       += -mrecord-mcount
 928   ifdef CONFIG_HAVE_NOP_MCOUNT
 929     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 930       CC_FLAGS_FTRACE   += -mnop-mcount
 931       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 932     endif
 933   endif
 934 endif
 935 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 936   CC_FLAGS_USING        += -DCC_USING_NOP_MCOUNT
 937 endif
 938 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 939   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 940     BUILD_C_RECORDMCOUNT := y
 941     export BUILD_C_RECORDMCOUNT
 942   endif
 943 endif
 944 ifdef CONFIG_HAVE_FENTRY
 945   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 946   ifeq ($(call cc-option-yn, -mfentry),y)
 947     CC_FLAGS_FTRACE     += -mfentry
 948     CC_FLAGS_USING      += -DCC_USING_FENTRY
 949   endif
 950 endif
 951 export CC_FLAGS_FTRACE
 952 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 953 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 954 endif
 955
 956 # We trigger additional mismatches with less inlining
 957 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 958 KBUILD_CFLAGS += -fno-inline-functions-called-once
 959 endif
 960
 961 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 962 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 963 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 964 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 965 LDFLAGS_vmlinux += --gc-sections
 966 endif
 967
 968 ifdef CONFIG_SHADOW_CALL_STACK
 969 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 970 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 971 export CC_FLAGS_SCS
 972 endif
 973
 974 ifdef CONFIG_LTO_CLANG
 975 ifdef CONFIG_LTO_CLANG_THIN
 976 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 977 KBUILD_LDFLAGS  += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 978 else
 979 CC_FLAGS_LTO    := -flto
 980 endif
 981 CC_FLAGS_LTO    += -fvisibility=hidden
 982
 983 # Limit inlining across translation units to reduce binary size
 984 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 985
 986 # Check for frame size exceeding threshold during prolog/epilog insertion
 987 # when using lld < 13.0.0.
 988 ifneq ($(CONFIG_FRAME_WARN),0)
 989 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
 990 KBUILD_LDFLAGS  += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
 991 endif
 992 endif
 993 endif
 994
 995 ifdef CONFIG_LTO
 996 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
 997 KBUILD_AFLAGS   += -fno-lto
 998 export CC_FLAGS_LTO
 999 endif
1000
1001 ifdef CONFIG_CFI_CLANG
1002 CC_FLAGS_CFI    := -fsanitize=kcfi
1003 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
1004 export CC_FLAGS_CFI
1005 endif
1006
1007 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
1008 KBUILD_CFLAGS += -falign-functions=64
1009 endif
1010
1011 # arch Makefile may override CC so keep this after arch Makefile is included
1012 NOSTDINC_FLAGS += -nostdinc
1013
1014 # warn about C99 declaration after statement
1015 KBUILD_CFLAGS += -Wdeclaration-after-statement
1016
1017 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1018 KBUILD_CFLAGS += -Wvla
1019
1020 # disable pointer signed / unsigned warnings in gcc 4.0
1021 KBUILD_CFLAGS += -Wno-pointer-sign
1022
1023 # In order to make sure new function cast mismatches are not introduced
1024 # in the kernel (to avoid tripping CFI checking), the kernel should be
1025 # globally built with -Wcast-function-type.
1026 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
1027
1028 # disable stringop warnings in gcc 8+
1029 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1030
1031 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1032 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1033
1034 # Another good warning that we'll want to enable eventually
1035 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1036
1037 # Enabled with W=2, disabled by default as noisy
1038 ifdef CONFIG_CC_IS_GCC
1039 KBUILD_CFLAGS += -Wno-maybe-uninitialized
1040 endif
1041
1042 # The allocators already balk at large sizes, so silence the compiler
1043 # warnings for bounds checks involving those possible values. While
1044 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1045 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1046 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1047 # doesn't work (as it is documented to), silently resolving to "0" prior to
1048 # version 9.1 (and producing an error more recently). Numeric values larger
1049 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1050 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1051 # choice, we must perform a versioned check to disable this warning.
1052 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1053 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
1054 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
1055
1056 # disable invalid "can't wrap" optimizations for signed / pointers
1057 KBUILD_CFLAGS   += -fno-strict-overflow
1058
1059 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1060 KBUILD_CFLAGS  += -fno-stack-check
1061
1062 # conserve stack if available
1063 ifdef CONFIG_CC_IS_GCC
1064 KBUILD_CFLAGS   += -fconserve-stack
1065 endif
1066
1067 # Prohibit date/time macros, which would make the build non-deterministic
1068 KBUILD_CFLAGS   += -Werror=date-time
1069
1070 # enforce correct pointer usage
1071 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
1072
1073 # Require designated initializers for all marked structures
1074 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
1075
1076 # change __FILE__ to the relative path from the srctree
1077 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1078
1079 # include additional Makefiles when needed
1080 include-y                       := scripts/Makefile.extrawarn
1081 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1082 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1083 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1084 include-$(CONFIG_KMSAN)         += scripts/Makefile.kmsan
1085 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1086 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1087 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1088 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1089
1090 include $(addprefix $(srctree)/, $(include-y))
1091
1092 # scripts/Makefile.gcc-plugins is intentionally included last.
1093 # Do not add $(call cc-option,...) below this line. When you build the kernel
1094 # from the clean source tree, the GCC plugins do not exist at this point.
1095
1096 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1097 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1098 KBUILD_AFLAGS   += $(KAFLAGS)
1099 KBUILD_CFLAGS   += $(KCFLAGS)
1100 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1101
1102 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1103 LDFLAGS_vmlinux += --build-id=sha1
1104
1105 KBUILD_LDFLAGS  += -z noexecstack
1106 ifeq ($(CONFIG_LD_IS_BFD),y)
1107 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
1108 endif
1109
1110 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1111 LDFLAGS_vmlinux += -X
1112 endif
1113
1114 ifeq ($(CONFIG_RELR),y)
1115 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1116 endif
1117
1118 # We never want expected sections to be placed heuristically by the
1119 # linker. All sections should be explicitly named in the linker script.
1120 ifdef CONFIG_LD_ORPHAN_WARN
1121 LDFLAGS_vmlinux += --orphan-handling=warn
1122 endif
1123
1124 # Align the bit size of userspace programs with the kernel
1125 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1126 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1127
1128 # make the checker run with the right architecture
1129 CHECKFLAGS += --arch=$(ARCH)
1130
1131 # insure the checker run with the right endianness
1132 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1133
1134 # the checker needs the correct machine size
1135 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1136
1137 # Default kernel image to build when no specific target is given.
1138 # KBUILD_IMAGE may be overruled on the command line or
1139 # set in the environment
1140 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1141 # this default value
1142 export KBUILD_IMAGE ?= vmlinux
1143
1144 #
1145 # INSTALL_PATH specifies where to place the updated kernel and system map
1146 # images. Default is /boot, but you can set it to other values
1147 export  INSTALL_PATH ?= /boot
1148
1149 #
1150 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1151 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1152 # an argument if needed. Otherwise it defaults to the kernel install path
1153 #
1154 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1155
1156 #
1157 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1158 # relocations required by build roots.  This is not defined in the
1159 # makefile but the argument can be passed to make if needed.
1160 #
1161
1162 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1163 export MODLIB
1164
1165 PHONY += prepare0
1166
1167 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1168 export MODORDER := $(extmod_prefix)modules.order
1169 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1170
1171 ifeq ($(KBUILD_EXTMOD),)
1172
1173 build-dir       := .
1174 clean-dirs      := $(sort . Documentation \
1175                      $(patsubst %/,%,$(filter %/, $(core-) \
1176                         $(drivers-) $(libs-))))
1177
1178 export ARCH_CORE        := $(core-y)
1179 export ARCH_LIB         := $(filter %/, $(libs-y))
1180 export ARCH_DRIVERS     := $(drivers-y) $(drivers-m)
1181 # Externally visible symbols (used by link-vmlinux.sh)
1182
1183 KBUILD_VMLINUX_OBJS := ./built-in.a
1184 ifdef CONFIG_MODULES
1185 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1186 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1187 else
1188 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1189 endif
1190
1191 export KBUILD_VMLINUX_LIBS
1192 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1193
1194 # Recurse until adjust_autoksyms.sh is satisfied
1195 PHONY += autoksyms_recursive
1196 ifdef CONFIG_TRIM_UNUSED_KSYMS
1197 # For the kernel to actually contain only the needed exported symbols,
1198 # we have to build modules as well to determine what those symbols are.
1199 # (this can be evaluated only once include/config/auto.conf has been included)
1200 KBUILD_MODULES := 1
1201
1202 autoksyms_recursive: $(build-dir) modules.order
1203         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1204           "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1205 endif
1206
1207 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1208
1209 quiet_cmd_autoksyms_h = GEN     $@
1210       cmd_autoksyms_h = mkdir -p $(dir $@); \
1211                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1212
1213 $(autoksyms_h):
1214         $(call cmd,autoksyms_h)
1215
1216 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1217 quiet_cmd_ar_vmlinux.a = AR      $@
1218       cmd_ar_vmlinux.a = \
1219         rm -f $@; \
1220         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1221         $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1222
1223 targets += vmlinux.a
1224 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
1225         $(call if_changed,ar_vmlinux.a)
1226
1227 PHONY += vmlinux_o
1228 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1229         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1230
1231 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1232         @:
1233
1234 PHONY += vmlinux
1235 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1236         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1237
1238 # The actual objects are generated when descending,
1239 # make sure no implicit rule kicks in
1240 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1241
1242 filechk_kernel.release = \
1243         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1244
1245 # Store (new) KERNELRELEASE string in include/config/kernel.release
1246 include/config/kernel.release: FORCE
1247         $(call filechk,kernel.release)
1248
1249 # Additional helpers built in scripts/
1250 # Carefully list dependencies so we do not try to build scripts twice
1251 # in parallel
1252 PHONY += scripts
1253 scripts: scripts_basic scripts_dtc
1254         $(Q)$(MAKE) $(build)=$(@)
1255
1256 # Things we need to do before we recursively start building the kernel
1257 # or the modules are listed in "prepare".
1258 # A multi level approach is used. prepareN is processed before prepareN-1.
1259 # archprepare is used in arch Makefiles and when processed asm symlink,
1260 # version.h and scripts_basic is processed / created.
1261
1262 PHONY += prepare archprepare
1263
1264 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1265         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1266         include/generated/compile.h include/generated/autoconf.h remove-stale-files
1267
1268 prepare0: archprepare
1269         $(Q)$(MAKE) $(build)=scripts/mod
1270         $(Q)$(MAKE) $(build)=. prepare
1271
1272 # All the preparing..
1273 prepare: prepare0
1274 ifdef CONFIG_RUST
1275         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v
1276         $(Q)$(MAKE) $(build)=rust
1277 endif
1278
1279 PHONY += remove-stale-files
1280 remove-stale-files:
1281         $(Q)$(srctree)/scripts/remove-stale-files
1282
1283 # Support for using generic headers in asm-generic
1284 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1285
1286 PHONY += asm-generic uapi-asm-generic
1287 asm-generic: uapi-asm-generic
1288         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1289         generic=include/asm-generic
1290 uapi-asm-generic:
1291         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1292         generic=include/uapi/asm-generic
1293
1294 # Generate some files
1295 # ---------------------------------------------------------------------------
1296
1297 # KERNELRELEASE can change from a few different places, meaning version.h
1298 # needs to be updated, so this check is forced on all builds
1299
1300 uts_len := 64
1301 define filechk_utsrelease.h
1302         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1303           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1304           exit 1;                                                         \
1305         fi;                                                               \
1306         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1307 endef
1308
1309 define filechk_version.h
1310         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1311                 echo \#define LINUX_VERSION_CODE $(shell                 \
1312                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1313         else                                                             \
1314                 echo \#define LINUX_VERSION_CODE $(shell                 \
1315                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1316         fi;                                                              \
1317         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1318         ((c) > 255 ? 255 : (c)))';                                       \
1319         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1320         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1321         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1322 endef
1323
1324 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1325 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1326 $(version_h): FORCE
1327         $(call filechk,version.h)
1328
1329 include/generated/utsrelease.h: include/config/kernel.release FORCE
1330         $(call filechk,utsrelease.h)
1331
1332 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1333         "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1334
1335 include/generated/compile.h: FORCE
1336         $(call filechk,compile.h)
1337
1338 PHONY += headerdep
1339 headerdep:
1340         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1341         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1342
1343 # ---------------------------------------------------------------------------
1344 # Kernel headers
1345
1346 #Default location for installed headers
1347 export INSTALL_HDR_PATH = $(objtree)/usr
1348
1349 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1350       cmd_headers_install = \
1351         mkdir -p $(INSTALL_HDR_PATH); \
1352         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1353         usr/include $(INSTALL_HDR_PATH)
1354
1355 PHONY += headers_install
1356 headers_install: headers
1357         $(call cmd,headers_install)
1358
1359 PHONY += archheaders archscripts
1360
1361 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1362
1363 PHONY += headers
1364 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1365         $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1366         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1367         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1368
1369 ifdef CONFIG_HEADERS_INSTALL
1370 prepare: headers
1371 endif
1372
1373 PHONY += scripts_unifdef
1374 scripts_unifdef: scripts_basic
1375         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1376
1377 # ---------------------------------------------------------------------------
1378 # Install
1379
1380 # Many distributions have the custom install script, /sbin/installkernel.
1381 # If DKMS is installed, 'make install' will eventually recurse back
1382 # to this Makefile to build and install external modules.
1383 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1384
1385 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1386       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1387
1388 # ---------------------------------------------------------------------------
1389 # Tools
1390
1391 ifdef CONFIG_OBJTOOL
1392 prepare: tools/objtool
1393 endif
1394
1395 ifdef CONFIG_BPF
1396 ifdef CONFIG_DEBUG_INFO_BTF
1397 prepare: tools/bpf/resolve_btfids
1398 endif
1399 endif
1400
1401 PHONY += resolve_btfids_clean
1402
1403 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1404
1405 # tools/bpf/resolve_btfids directory might not exist
1406 # in output directory, skip its clean in that case
1407 resolve_btfids_clean:
1408 ifneq ($(wildcard $(resolve_btfids_O)),)
1409         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1410 endif
1411
1412 # Clear a bunch of variables before executing the submake
1413 ifeq ($(quiet),silent_)
1414 tools_silent=s
1415 endif
1416
1417 tools/: FORCE
1418         $(Q)mkdir -p $(objtree)/tools
1419         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1420
1421 tools/%: FORCE
1422         $(Q)mkdir -p $(objtree)/tools
1423         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1424
1425 # ---------------------------------------------------------------------------
1426 # Kernel selftest
1427
1428 PHONY += kselftest
1429 kselftest: headers
1430         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1431
1432 kselftest-%: headers FORCE
1433         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1434
1435 PHONY += kselftest-merge
1436 kselftest-merge:
1437         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1438         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1439                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1440         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1441
1442 # ---------------------------------------------------------------------------
1443 # Devicetree files
1444
1445 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1446 dtstree := arch/$(SRCARCH)/boot/dts
1447 endif
1448
1449 ifneq ($(dtstree),)
1450
1451 %.dtb: dtbs_prepare
1452         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1453
1454 %.dtbo: dtbs_prepare
1455         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1456
1457 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1458 dtbs: dtbs_prepare
1459         $(Q)$(MAKE) $(build)=$(dtstree)
1460
1461 # include/config/kernel.release is actually needed when installing DTBs because
1462 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1463 # dtbs_install depend on it as dtbs_install may run as root.
1464 dtbs_prepare: include/config/kernel.release scripts_dtc
1465
1466 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1467 export CHECK_DTBS=y
1468 dtbs: dt_binding_check
1469 endif
1470
1471 dtbs_check: dtbs
1472
1473 dtbs_install:
1474         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1475
1476 ifdef CONFIG_OF_EARLY_FLATTREE
1477 all: dtbs
1478 endif
1479
1480 endif
1481
1482 PHONY += scripts_dtc
1483 scripts_dtc: scripts_basic
1484         $(Q)$(MAKE) $(build)=scripts/dtc
1485
1486 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1487 export CHECK_DT_BINDING=y
1488 endif
1489
1490 PHONY += dt_binding_check
1491 dt_binding_check: scripts_dtc
1492         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1493
1494 PHONY += dt_compatible_check
1495 dt_compatible_check: dt_binding_check
1496         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1497
1498 # ---------------------------------------------------------------------------
1499 # Modules
1500
1501 ifdef CONFIG_MODULES
1502
1503 # By default, build modules as well
1504
1505 all: modules
1506
1507 # When we're building modules with modversions, we need to consider
1508 # the built-in objects during the descend as well, in order to
1509 # make sure the checksums are up to date before we record them.
1510 ifdef CONFIG_MODVERSIONS
1511   KBUILD_BUILTIN := 1
1512 endif
1513
1514 # Build modules
1515 #
1516
1517 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
1518 # is an exception.
1519 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1520 modules: vmlinux
1521 endif
1522
1523 modules: modules_prepare
1524
1525 # Target to prepare building external modules
1526 modules_prepare: prepare
1527         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1528
1529 export modules_sign_only :=
1530
1531 ifeq ($(CONFIG_MODULE_SIG),y)
1532 PHONY += modules_sign
1533 modules_sign: modules_install
1534         @:
1535
1536 # modules_sign is a subset of modules_install.
1537 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1538 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1539 modules_sign_only := y
1540 endif
1541 endif
1542
1543 modinst_pre :=
1544 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1545 modinst_pre := __modinst_pre
1546 endif
1547
1548 modules_install: $(modinst_pre)
1549 PHONY += __modinst_pre
1550 __modinst_pre:
1551         @rm -rf $(MODLIB)/kernel
1552         @rm -f $(MODLIB)/source
1553         @mkdir -p $(MODLIB)/kernel
1554         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1555         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1556                 rm -f $(MODLIB)/build ; \
1557                 ln -s $(CURDIR) $(MODLIB)/build ; \
1558         fi
1559         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1560         @cp -f modules.builtin $(MODLIB)/
1561         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1562
1563 endif # CONFIG_MODULES
1564
1565 ###
1566 # Cleaning is done on three levels.
1567 # make clean     Delete most generated files
1568 #                Leave enough to build external modules
1569 # make mrproper  Delete the current configuration, and all generated files
1570 # make distclean Remove editor backup files, patch leftover files and the like
1571
1572 # Directories & files removed with 'make clean'
1573 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1574                modules.builtin modules.builtin.modinfo modules.nsdeps \
1575                compile_commands.json .thinlto-cache rust/test rust/doc \
1576                .vmlinux.objs .vmlinux.export.c
1577
1578 # Directories & files removed with 'make mrproper'
1579 MRPROPER_FILES += include/config include/generated          \
1580                   arch/$(SRCARCH)/include/generated .objdiff \
1581                   debian snap tar-install \
1582                   .config .config.old .version \
1583                   Module.symvers \
1584                   certs/signing_key.pem \
1585                   certs/x509.genkey \
1586                   vmlinux-gdb.py \
1587                   *.spec \
1588                   rust/target.json rust/libmacros.so
1589
1590 # clean - Delete most, but leave enough to build external modules
1591 #
1592 clean: rm-files := $(CLEAN_FILES)
1593
1594 PHONY += archclean vmlinuxclean
1595
1596 vmlinuxclean:
1597         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1598         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1599
1600 clean: archclean vmlinuxclean resolve_btfids_clean
1601
1602 # mrproper - Delete all generated files, including .config
1603 #
1604 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1605 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1606
1607 PHONY += $(mrproper-dirs) mrproper
1608 $(mrproper-dirs):
1609         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1610
1611 mrproper: clean $(mrproper-dirs)
1612         $(call cmd,rmfiles)
1613         @find . $(RCS_FIND_IGNORE) \
1614                 \( -name '*.rmeta' \) \
1615                 -type f -print | xargs rm -f
1616
1617 # distclean
1618 #
1619 PHONY += distclean
1620
1621 distclean: mrproper
1622         @find . $(RCS_FIND_IGNORE) \
1623                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1624                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1625                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1626                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1627                 -type f -print | xargs rm -f
1628
1629
1630 # Packaging of the kernel to various formats
1631 # ---------------------------------------------------------------------------
1632
1633 %src-pkg: FORCE
1634         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1635 %pkg: include/config/kernel.release FORCE
1636         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1637
1638 # Brief documentation of the typical targets used
1639 # ---------------------------------------------------------------------------
1640
1641 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1642 boards := $(sort $(notdir $(boards)))
1643 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1644 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1645
1646 PHONY += help
1647 help:
1648         @echo  'Cleaning targets:'
1649         @echo  '  clean           - Remove most generated files but keep the config and'
1650         @echo  '                    enough build support to build external modules'
1651         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1652         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1653         @echo  ''
1654         @echo  'Configuration targets:'
1655         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1656         @echo  ''
1657         @echo  'Other generic targets:'
1658         @echo  '  all             - Build all targets marked with [*]'
1659         @echo  '* vmlinux         - Build the bare kernel'
1660         @echo  '* modules         - Build all modules'
1661         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1662         @echo  '  dir/            - Build all files in dir and below'
1663         @echo  '  dir/file.[ois]  - Build specified target only'
1664         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1665         @echo  '                    (requires compiler support for LLVM assembly generation)'
1666         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1667         @echo  '                    (requires a recent binutils and recent build (System.map))'
1668         @echo  '  dir/file.ko     - Build module including final link'
1669         @echo  '  modules_prepare - Set up for building external modules'
1670         @echo  '  tags/TAGS       - Generate tags file for editors'
1671         @echo  '  cscope          - Generate cscope index'
1672         @echo  '  gtags           - Generate GNU GLOBAL index'
1673         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1674         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1675         @echo  '  image_name      - Output the image name (use with make -s)'
1676         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1677          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1678          echo  ''
1679         @echo  'Static analysers:'
1680         @echo  '  checkstack      - Generate a list of stack hogs'
1681         @echo  '  versioncheck    - Sanity check on version.h usage'
1682         @echo  '  includecheck    - Check for duplicate included header files'
1683         @echo  '  export_report   - List the usages of all exported symbols'
1684         @echo  '  headerdep       - Detect inclusion cycles in headers'
1685         @echo  '  coccicheck      - Check with Coccinelle'
1686         @echo  '  clang-analyzer  - Check with clang static analyzer'
1687         @echo  '  clang-tidy      - Check with clang-tidy'
1688         @echo  ''
1689         @echo  'Tools:'
1690         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1691         @echo  ''
1692         @echo  'Kernel selftest:'
1693         @echo  '  kselftest         - Build and run kernel selftest'
1694         @echo  '                      Build, install, and boot kernel before'
1695         @echo  '                      running kselftest on it'
1696         @echo  '                      Run as root for full coverage'
1697         @echo  '  kselftest-all     - Build kernel selftest'
1698         @echo  '  kselftest-install - Build and install kernel selftest'
1699         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1700         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1701         @echo  '                      kselftest to existing .config.'
1702         @echo  ''
1703         @echo  'Rust targets:'
1704         @echo  '  rustavailable   - Checks whether the Rust toolchain is'
1705         @echo  '                    available and, if not, explains why.'
1706         @echo  '  rustfmt         - Reformat all the Rust code in the kernel'
1707         @echo  '  rustfmtcheck    - Checks if all the Rust code in the kernel'
1708         @echo  '                    is formatted, printing a diff otherwise.'
1709         @echo  '  rustdoc         - Generate Rust documentation'
1710         @echo  '                    (requires kernel .config)'
1711         @echo  '  rusttest        - Runs the Rust tests'
1712         @echo  '                    (requires kernel .config; downloads external repos)'
1713         @echo  '  rust-analyzer   - Generate rust-project.json rust-analyzer support file'
1714         @echo  '                    (requires kernel .config)'
1715         @echo  '  dir/file.[os]   - Build specified target only'
1716         @echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1717         @echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1718         @echo  '                    The output is not intended to be compilable.'
1719         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1720         @echo  ''
1721         @$(if $(dtstree), \
1722                 echo 'Devicetree:'; \
1723                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1724                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1725                 echo '  dt_binding_check - Validate device tree binding documents'; \
1726                 echo '  dtbs_check       - Validate device tree source files';\
1727                 echo '')
1728
1729         @echo 'Userspace tools targets:'
1730         @echo '  use "make tools/help"'
1731         @echo '  or  "cd tools; make help"'
1732         @echo  ''
1733         @echo  'Kernel packaging:'
1734         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1735         @echo  ''
1736         @echo  'Documentation targets:'
1737         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1738         @echo  ''
1739         @echo  'Architecture specific targets ($(SRCARCH)):'
1740         @$(or $(archhelp),\
1741                 echo '  No architecture specific help defined for $(SRCARCH)')
1742         @echo  ''
1743         @$(if $(boards), \
1744                 $(foreach b, $(boards), \
1745                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1746                 echo '')
1747         @$(if $(board-dirs), \
1748                 $(foreach b, $(board-dirs), \
1749                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1750                 printf "  %-16s - Show all of the above\\n" help-boards; \
1751                 echo '')
1752
1753         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1754         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1755         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1756         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1757         @echo  '                       (sparse by default)'
1758         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1759         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1760         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1761         @echo  '                1: warnings which may be relevant and do not occur too often'
1762         @echo  '                2: warnings which occur quite often but may still be relevant'
1763         @echo  '                3: more obscure warnings, can most likely be ignored'
1764         @echo  '                e: warnings are being treated as errors'
1765         @echo  '                Multiple levels can be combined with W=12 or W=123'
1766         @echo  ''
1767         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1768         @echo  'For further info see the ./README file'
1769
1770
1771 help-board-dirs := $(addprefix help-,$(board-dirs))
1772
1773 help-boards: $(help-board-dirs)
1774
1775 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1776
1777 $(help-board-dirs): help-%:
1778         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1779         @$(if $(boards-per-dir), \
1780                 $(foreach b, $(boards-per-dir), \
1781                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1782                 echo '')
1783
1784
1785 # Documentation targets
1786 # ---------------------------------------------------------------------------
1787 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1788                linkcheckdocs dochelp refcheckdocs
1789 PHONY += $(DOC_TARGETS)
1790 $(DOC_TARGETS):
1791         $(Q)$(MAKE) $(build)=Documentation $@
1792
1793
1794 # Rust targets
1795 # ---------------------------------------------------------------------------
1796
1797 # "Is Rust available?" target
1798 PHONY += rustavailable
1799 rustavailable:
1800         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!"
1801
1802 # Documentation target
1803 #
1804 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1805 PHONY += rustdoc
1806 rustdoc: prepare
1807         $(Q)$(MAKE) $(build)=rust $@
1808
1809 # Testing target
1810 PHONY += rusttest
1811 rusttest: prepare
1812         $(Q)$(MAKE) $(build)=rust $@
1813
1814 # Formatting targets
1815 PHONY += rustfmt rustfmtcheck
1816
1817 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1818 #
1819 # We match using absolute paths since `find` does not resolve them
1820 # when matching, which is a problem when e.g. `srctree` is `..`.
1821 # We `grep` afterwards in order to remove the directory entry itself.
1822 rustfmt:
1823         $(Q)find $(abs_srctree) -type f -name '*.rs' \
1824                 -o -path $(abs_srctree)/rust/alloc -prune \
1825                 -o -path $(abs_objtree)/rust/test -prune \
1826                 | grep -Fv $(abs_srctree)/rust/alloc \
1827                 | grep -Fv $(abs_objtree)/rust/test \
1828                 | grep -Fv generated \
1829                 | xargs $(RUSTFMT) $(rustfmt_flags)
1830
1831 rustfmtcheck: rustfmt_flags = --check
1832 rustfmtcheck: rustfmt
1833
1834 # IDE support targets
1835 PHONY += rust-analyzer
1836 rust-analyzer:
1837         $(Q)$(MAKE) $(build)=rust $@
1838
1839 # Misc
1840 # ---------------------------------------------------------------------------
1841
1842 PHONY += scripts_gdb
1843 scripts_gdb: prepare0
1844         $(Q)$(MAKE) $(build)=scripts/gdb
1845         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1846
1847 ifdef CONFIG_GDB_SCRIPTS
1848 all: scripts_gdb
1849 endif
1850
1851 else # KBUILD_EXTMOD
1852
1853 ###
1854 # External module support.
1855 # When building external modules the kernel used as basis is considered
1856 # read-only, and no consistency checks are made and the make
1857 # system is not used on the basis kernel. If updates are required
1858 # in the basis kernel ordinary make commands (without M=...) must be used.
1859
1860 # We are always building only modules.
1861 KBUILD_BUILTIN :=
1862 KBUILD_MODULES := 1
1863
1864 build-dir := $(KBUILD_EXTMOD)
1865
1866 compile_commands.json: $(extmod_prefix)compile_commands.json
1867 PHONY += compile_commands.json
1868
1869 clean-dirs := $(KBUILD_EXTMOD)
1870 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1871         $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1872
1873 PHONY += prepare
1874 # now expand this into a simple variable to reduce the cost of shell evaluations
1875 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1876 prepare:
1877         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1878                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1879                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1880                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1881         fi
1882
1883 PHONY += help
1884 help:
1885         @echo  '  Building external modules.'
1886         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1887         @echo  ''
1888         @echo  '  modules         - default target, build the module(s)'
1889         @echo  '  modules_install - install the module'
1890         @echo  '  clean           - remove generated files in module directory only'
1891         @echo  ''
1892
1893 endif # KBUILD_EXTMOD
1894
1895 # ---------------------------------------------------------------------------
1896 # Modules
1897
1898 PHONY += modules modules_install modules_prepare
1899
1900 ifdef CONFIG_MODULES
1901
1902 $(MODORDER): $(build-dir)
1903         @:
1904
1905 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1906 # This is solely useful to speed up test compiles.
1907 modules: modpost
1908 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1909         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1910 endif
1911
1912 PHONY += modules_check
1913 modules_check: $(MODORDER)
1914         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1915
1916 quiet_cmd_depmod = DEPMOD  $(MODLIB)
1917       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1918                    $(KERNELRELEASE)
1919
1920 modules_install:
1921         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1922         $(call cmd,depmod)
1923
1924 else # CONFIG_MODULES
1925
1926 # Modules not configured
1927 # ---------------------------------------------------------------------------
1928
1929 modules modules_install:
1930         @echo >&2 '***'
1931         @echo >&2 '*** The present kernel configuration has modules disabled.'
1932         @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1933         @echo >&2 '*** to enable CONFIG_MODULES.'
1934         @echo >&2 '***'
1935         @exit 1
1936
1937 KBUILD_MODULES :=
1938
1939 endif # CONFIG_MODULES
1940
1941 PHONY += modpost
1942 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1943          $(if $(KBUILD_MODULES), modules_check)
1944         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1945
1946 # Single targets
1947 # ---------------------------------------------------------------------------
1948 # To build individual files in subdirectories, you can do like this:
1949 #
1950 #   make foo/bar/baz.s
1951 #
1952 # The supported suffixes for single-target are listed in 'single-targets'
1953 #
1954 # To build only under specific subdirectories, you can do like this:
1955 #
1956 #   make foo/bar/baz/
1957
1958 ifdef single-build
1959
1960 # .ko is special because modpost is needed
1961 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1962 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1963                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1964
1965 $(single-ko): single_modules
1966         @:
1967 $(single-no-ko): $(build-dir)
1968         @:
1969
1970 # Remove MODORDER when done because it is not the real one.
1971 PHONY += single_modules
1972 single_modules: $(single-no-ko) modules_prepare
1973         $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1974         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1975 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1976         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1977 endif
1978         $(Q)rm -f $(MODORDER)
1979
1980 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1981
1982 KBUILD_MODULES := 1
1983
1984 endif
1985
1986 # Preset locale variables to speed up the build process. Limit locale
1987 # tweaks to this spot to avoid wrong language settings when running
1988 # make menuconfig etc.
1989 # Error messages still appears in the original language
1990 PHONY += $(build-dir)
1991 $(build-dir): prepare
1992         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1993
1994 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1995 PHONY += $(clean-dirs) clean
1996 $(clean-dirs):
1997         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1998
1999 clean: $(clean-dirs)
2000         $(call cmd,rmfiles)
2001         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
2002                 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2003                 -o -name '*.ko.*' \
2004                 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
2005                 -o -name '*.dwo' -o -name '*.lst' \
2006                 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
2007                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2008                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2009                 -o -name '*.asn1.[ch]' \
2010                 -o -name '*.symtypes' -o -name 'modules.order' \
2011                 -o -name '.tmp_*' \
2012                 -o -name '*.c.[012]*.*' \
2013                 -o -name '*.ll' \
2014                 -o -name '*.gcno' \
2015                 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
2016
2017 # Generate tags for editors
2018 # ---------------------------------------------------------------------------
2019 quiet_cmd_tags = GEN     $@
2020       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2021
2022 tags TAGS cscope gtags: FORCE
2023         $(call cmd,tags)
2024
2025 # Script to generate missing namespace dependencies
2026 # ---------------------------------------------------------------------------
2027
2028 PHONY += nsdeps
2029 nsdeps: export KBUILD_NSDEPS=1
2030 nsdeps: modules
2031         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2032
2033 # Clang Tooling
2034 # ---------------------------------------------------------------------------
2035
2036 quiet_cmd_gen_compile_commands = GEN     $@
2037       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2038
2039 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
2040         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2041         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2042         $(call if_changed,gen_compile_commands)
2043
2044 targets += $(extmod_prefix)compile_commands.json
2045
2046 PHONY += clang-tidy clang-analyzer
2047
2048 ifdef CONFIG_CC_IS_CLANG
2049 quiet_cmd_clang_tools = CHECK   $<
2050       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2051
2052 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2053         $(call cmd,clang_tools)
2054 else
2055 clang-tidy clang-analyzer:
2056         @echo "$@ requires CC=clang" >&2
2057         @false
2058 endif
2059
2060 # Scripts to check various things for consistency
2061 # ---------------------------------------------------------------------------
2062
2063 PHONY += includecheck versioncheck coccicheck export_report
2064
2065 includecheck:
2066         find $(srctree)/* $(RCS_FIND_IGNORE) \
2067                 -name '*.[hcS]' -type f -print | sort \
2068                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2069
2070 versioncheck:
2071         find $(srctree)/* $(RCS_FIND_IGNORE) \
2072                 -name '*.[hcS]' -type f -print | sort \
2073                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2074
2075 coccicheck:
2076         $(Q)$(BASH) $(srctree)/scripts/$@
2077
2078 export_report:
2079         $(PERL) $(srctree)/scripts/export_report.pl
2080
2081 PHONY += checkstack kernelrelease kernelversion image_name
2082
2083 # UML needs a little special treatment here.  It wants to use the host
2084 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2085 # else wants $(ARCH), including people doing cross-builds, which means
2086 # that $(SUBARCH) doesn't work here.
2087 ifeq ($(ARCH), um)
2088 CHECKSTACK_ARCH := $(SUBARCH)
2089 else
2090 CHECKSTACK_ARCH := $(ARCH)
2091 endif
2092 checkstack:
2093         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2094         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2095
2096 kernelrelease:
2097         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2098
2099 kernelversion:
2100         @echo $(KERNELVERSION)
2101
2102 image_name:
2103         @echo $(KBUILD_IMAGE)
2104
2105 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2106       cmd_rmfiles = rm -rf $(rm-files)
2107
2108 # read saved command lines for existing targets
2109 existing-targets := $(wildcard $(sort $(targets)))
2110
2111 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2112
2113 endif # config-build
2114 endif # mixed-build
2115 endif # need-sub-make
2116
2117 PHONY += FORCE
2118 FORCE:
2119
2120 # Declare the contents of the PHONY variable as phony.  We keep that
2121 # information in a variable so we can use it in if_changed and friends.
2122 .PHONY: $(PHONY)