Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 6
   3 PATCHLEVEL = 1
   4 SUBLEVEL = 18
   5 EXTRAVERSION =
   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 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
  97
  98 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
  99 silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
 100 else
 101 silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
 102 endif
 103
 104 ifeq ($(silence),s)
 105 quiet=silent_
 106 KBUILD_VERBOSE = 0
 107 endif
 108
 109 export quiet Q KBUILD_VERBOSE
 110
 111 # Call a source code checker (by default, "sparse") as part of the
 112 # C compilation.
 113 #
 114 # Use 'make C=1' to enable checking of only re-compiled files.
 115 # Use 'make C=2' to enable checking of *all* source files, regardless
 116 # of whether they are re-compiled or not.
 117 #
 118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 119 # including where to get the "sparse" utility.
 120
 121 ifeq ("$(origin C)", "command line")
 122   KBUILD_CHECKSRC = $(C)
 123 endif
 124 ifndef KBUILD_CHECKSRC
 125   KBUILD_CHECKSRC = 0
 126 endif
 127
 128 export KBUILD_CHECKSRC
 129
 130 # Enable "clippy" (a linter) as part of the Rust compilation.
 131 #
 132 # Use 'make CLIPPY=1' to enable it.
 133 ifeq ("$(origin CLIPPY)", "command line")
 134   KBUILD_CLIPPY := $(CLIPPY)
 135 endif
 136
 137 export KBUILD_CLIPPY
 138
 139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 140 # directory of external module to build. Setting M= takes precedence.
 141 ifeq ("$(origin M)", "command line")
 142   KBUILD_EXTMOD := $(M)
 143 endif
 144
 145 $(if $(word 2, $(KBUILD_EXTMOD)), \
 146         $(error building multiple external modules is not supported))
 147
 148 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
 149         $(error module directory path cannot contain '$x')))
 150
 151 # Remove trailing slashes
 152 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 153 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 154 endif
 155
 156 export KBUILD_EXTMOD
 157
 158 # Kbuild will save output files in the current working directory.
 159 # This does not need to match to the root of the kernel source tree.
 160 #
 161 # For example, you can do this:
 162 #
 163 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 164 #
 165 # If you want to save output files in a different location, there are
 166 # two syntaxes to specify it.
 167 #
 168 # 1) O=
 169 # Use "make O=dir/to/store/output/files/"
 170 #
 171 # 2) Set KBUILD_OUTPUT
 172 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 173 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 174 #
 175 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 176 # variable.
 177
 178 # Do we want to change the working directory?
 179 ifeq ("$(origin O)", "command line")
 180   KBUILD_OUTPUT := $(O)
 181 endif
 182
 183 ifneq ($(KBUILD_OUTPUT),)
 184 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 185 # expand a shell special character '~'. We use a somewhat tedious way here.
 186 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 187 $(if $(abs_objtree),, \
 188      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 189
 190 # $(realpath ...) resolves symlinks
 191 abs_objtree := $(realpath $(abs_objtree))
 192 else
 193 abs_objtree := $(CURDIR)
 194 endif # ifneq ($(KBUILD_OUTPUT),)
 195
 196 ifeq ($(abs_objtree),$(CURDIR))
 197 # Suppress "Entering directory ..." unless we are changing the work directory.
 198 MAKEFLAGS += --no-print-directory
 199 else
 200 need-sub-make := 1
 201 endif
 202
 203 this-makefile := $(lastword $(MAKEFILE_LIST))
 204 abs_srctree := $(realpath $(dir $(this-makefile)))
 205
 206 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 207 $(error source directory cannot contain spaces or colons)
 208 endif
 209
 210 ifneq ($(abs_srctree),$(abs_objtree))
 211 # Look for make include files relative to root of kernel src
 212 #
 213 # --included-dir is added for backward compatibility, but you should not rely on
 214 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
 215 MAKEFLAGS += --include-dir=$(abs_srctree)
 216 endif
 217
 218 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 219 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 220 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 221 need-sub-make := 1
 222 # Cancel implicit rules for this Makefile.
 223 $(this-makefile): ;
 224 endif
 225
 226 export abs_srctree abs_objtree
 227 export sub_make_done := 1
 228
 229 ifeq ($(need-sub-make),1)
 230
 231 PHONY += $(MAKECMDGOALS) __sub-make
 232
 233 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 234         @:
 235
 236 # Invoke a second make in the output directory, passing relevant variables
 237 __sub-make:
 238         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 239
 240 endif # need-sub-make
 241 endif # sub_make_done
 242
 243 # We process the rest of the Makefile if this is the final invocation of make
 244 ifeq ($(need-sub-make),)
 245
 246 # Do not print "Entering directory ...",
 247 # but we want to display it when entering to the output directory
 248 # so that IDEs/editors are able to understand relative filenames.
 249 MAKEFLAGS += --no-print-directory
 250
 251 ifeq ($(abs_srctree),$(abs_objtree))
 252         # building in the source tree
 253         srctree := .
 254         building_out_of_srctree :=
 255 else
 256         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 257                 # building in a subdirectory of the source tree
 258                 srctree := ..
 259         else
 260                 srctree := $(abs_srctree)
 261         endif
 262         building_out_of_srctree := 1
 263 endif
 264
 265 ifneq ($(KBUILD_ABS_SRCTREE),)
 266 srctree := $(abs_srctree)
 267 endif
 268
 269 objtree         := .
 270 VPATH           := $(srctree)
 271
 272 export building_out_of_srctree srctree objtree VPATH
 273
 274 # To make sure we do not include .config for any of the *config targets
 275 # catch them early, and hand them over to scripts/kconfig/Makefile
 276 # It is allowed to specify more targets when calling make, including
 277 # mixing *config targets and build targets.
 278 # For example 'make oldconfig all'.
 279 # Detect when mixed targets is specified, and make a second invocation
 280 # of make so .config is not included in this case either (for *config).
 281
 282 version_h := include/generated/uapi/linux/version.h
 283
 284 clean-targets := %clean mrproper cleandocs
 285 no-dot-config-targets := $(clean-targets) \
 286                          cscope gtags TAGS tags help% %docs check% coccicheck \
 287                          $(version_h) headers headers_% archheaders archscripts \
 288                          %asm-generic kernelversion %src-pkg dt_binding_check \
 289                          outputmakefile rustavailable rustfmt rustfmtcheck
 290 # Installation targets should not require compiler. Unfortunately, vdso_install
 291 # is an exception where build artifacts may be updated. This must be fixed.
 292 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
 293                         headers_install modules_install kernelrelease image_name
 294 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
 295                           image_name
 296 single-targets := %.a %.i %.rsi %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 297
 298 config-build    :=
 299 mixed-build     :=
 300 need-config     := 1
 301 need-compiler   := 1
 302 may-sync-config := 1
 303 single-build    :=
 304
 305 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 306         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 307                 need-config :=
 308         endif
 309 endif
 310
 311 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
 312         ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
 313                 need-compiler :=
 314         endif
 315 endif
 316
 317 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 318         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 319                 may-sync-config :=
 320         endif
 321 endif
 322
 323 ifneq ($(KBUILD_EXTMOD),)
 324         may-sync-config :=
 325 endif
 326
 327 ifeq ($(KBUILD_EXTMOD),)
 328         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 329                 config-build := 1
 330                 ifneq ($(words $(MAKECMDGOALS)),1)
 331                         mixed-build := 1
 332                 endif
 333         endif
 334 endif
 335
 336 # We cannot build single targets and the others at the same time
 337 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 338         single-build := 1
 339         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 340                 mixed-build := 1
 341         endif
 342 endif
 343
 344 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 345 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 346         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 347                 mixed-build := 1
 348         endif
 349 endif
 350
 351 # install and modules_install need also be processed one by one
 352 ifneq ($(filter install,$(MAKECMDGOALS)),)
 353         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 354                 mixed-build := 1
 355         endif
 356 endif
 357
 358 ifdef mixed-build
 359 # ===========================================================================
 360 # We're called with mixed targets (*config and build targets).
 361 # Handle them one by one.
 362
 363 PHONY += $(MAKECMDGOALS) __build_one_by_one
 364
 365 $(MAKECMDGOALS): __build_one_by_one
 366         @:
 367
 368 __build_one_by_one:
 369         $(Q)set -e; \
 370         for i in $(MAKECMDGOALS); do \
 371                 $(MAKE) -f $(srctree)/Makefile $$i; \
 372         done
 373
 374 else # !mixed-build
 375
 376 include $(srctree)/scripts/Kbuild.include
 377
 378 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 379 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 380 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 381 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 382
 383 include $(srctree)/scripts/subarch.include
 384
 385 # Cross compiling and selecting different set of gcc/bin-utils
 386 # ---------------------------------------------------------------------------
 387 #
 388 # When performing cross compilation for other architectures ARCH shall be set
 389 # to the target architecture. (See arch/* for the possibilities).
 390 # ARCH can be set during invocation of make:
 391 # make ARCH=ia64
 392 # Another way is to have ARCH set in the environment.
 393 # The default ARCH is the host where make is executed.
 394
 395 # CROSS_COMPILE specify the prefix used for all executables used
 396 # during compilation. Only gcc and related bin-utils executables
 397 # are prefixed with $(CROSS_COMPILE).
 398 # CROSS_COMPILE can be set on the command line
 399 # make CROSS_COMPILE=ia64-linux-
 400 # Alternatively CROSS_COMPILE can be set in the environment.
 401 # Default value for CROSS_COMPILE is not to prefix executables
 402 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 403 ARCH            ?= $(SUBARCH)
 404
 405 # Architecture as present in compile.h
 406 UTS_MACHINE     := $(ARCH)
 407 SRCARCH         := $(ARCH)
 408
 409 # Additional ARCH settings for x86
 410 ifeq ($(ARCH),i386)
 411         SRCARCH := x86
 412 endif
 413 ifeq ($(ARCH),x86_64)
 414         SRCARCH := x86
 415 endif
 416
 417 # Additional ARCH settings for sparc
 418 ifeq ($(ARCH),sparc32)
 419        SRCARCH := sparc
 420 endif
 421 ifeq ($(ARCH),sparc64)
 422        SRCARCH := sparc
 423 endif
 424
 425 # Additional ARCH settings for parisc
 426 ifeq ($(ARCH),parisc64)
 427        SRCARCH := parisc
 428 endif
 429
 430 export cross_compiling :=
 431 ifneq ($(SRCARCH),$(SUBARCH))
 432 cross_compiling := 1
 433 endif
 434
 435 KCONFIG_CONFIG  ?= .config
 436 export KCONFIG_CONFIG
 437
 438 # SHELL used by kbuild
 439 CONFIG_SHELL := sh
 440
 441 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 442 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 443 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 444
 445 ifneq ($(LLVM),)
 446 ifneq ($(filter %/,$(LLVM)),)
 447 LLVM_PREFIX := $(LLVM)
 448 else ifneq ($(filter -%,$(LLVM)),)
 449 LLVM_SUFFIX := $(LLVM)
 450 endif
 451
 452 HOSTCC  = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 453 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 454 else
 455 HOSTCC  = gcc
 456 HOSTCXX = g++
 457 endif
 458 HOSTRUSTC = rustc
 459 HOSTPKG_CONFIG  = pkg-config
 460
 461 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 462                          -O2 -fomit-frame-pointer -std=gnu11 \
 463                          -Wdeclaration-after-statement
 464 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 465 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 466
 467 # These flags apply to all Rust code in the tree, including the kernel and
 468 # host programs.
 469 export rust_common_flags := --edition=2021 \
 470                             -Zbinary_dep_depinfo=y \
 471                             -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
 472                             -Dunreachable_pub -Dnon_ascii_idents \
 473                             -Wmissing_docs \
 474                             -Drustdoc::missing_crate_level_docs \
 475                             -Dclippy::correctness -Dclippy::style \
 476                             -Dclippy::suspicious -Dclippy::complexity \
 477                             -Dclippy::perf \
 478                             -Dclippy::let_unit_value -Dclippy::mut_mut \
 479                             -Dclippy::needless_bitwise_bool \
 480                             -Dclippy::needless_continue \
 481                             -Wclippy::dbg_macro
 482
 483 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 484 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 485 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 486                         -Zallow-features= $(HOSTRUSTFLAGS)
 487 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 488 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 489
 490 # Make variables (CC, etc...)
 491 CPP             = $(CC) -E
 492 ifneq ($(LLVM),)
 493 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 494 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 495 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 496 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 497 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 498 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 499 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 500 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 501 else
 502 CC              = $(CROSS_COMPILE)gcc
 503 LD              = $(CROSS_COMPILE)ld
 504 AR              = $(CROSS_COMPILE)ar
 505 NM              = $(CROSS_COMPILE)nm
 506 OBJCOPY         = $(CROSS_COMPILE)objcopy
 507 OBJDUMP         = $(CROSS_COMPILE)objdump
 508 READELF         = $(CROSS_COMPILE)readelf
 509 STRIP           = $(CROSS_COMPILE)strip
 510 endif
 511 RUSTC           = rustc
 512 RUSTDOC         = rustdoc
 513 RUSTFMT         = rustfmt
 514 CLIPPY_DRIVER   = clippy-driver
 515 BINDGEN         = bindgen
 516 CARGO           = cargo
 517 PAHOLE          = pahole
 518 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 519 LEX             = flex
 520 YACC            = bison
 521 AWK             = awk
 522 INSTALLKERNEL  := installkernel
 523 DEPMOD          = depmod
 524 PERL            = perl
 525 PYTHON3         = python3
 526 CHECK           = sparse
 527 BASH            = bash
 528 KGZIP           = gzip
 529 KBZIP2          = bzip2
 530 KLZOP           = lzop
 531 LZMA            = lzma
 532 LZ4             = lz4c
 533 XZ              = xz
 534 ZSTD            = zstd
 535
 536 PAHOLE_FLAGS    = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
 537
 538 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 539                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 540 NOSTDINC_FLAGS :=
 541 CFLAGS_MODULE   =
 542 RUSTFLAGS_MODULE =
 543 AFLAGS_MODULE   =
 544 LDFLAGS_MODULE  =
 545 CFLAGS_KERNEL   =
 546 RUSTFLAGS_KERNEL =
 547 AFLAGS_KERNEL   =
 548 LDFLAGS_vmlinux =
 549
 550 # Use USERINCLUDE when you must reference the UAPI directories only.
 551 USERINCLUDE    := \
 552                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 553                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 554                 -I$(srctree)/include/uapi \
 555                 -I$(objtree)/include/generated/uapi \
 556                 -include $(srctree)/include/linux/compiler-version.h \
 557                 -include $(srctree)/include/linux/kconfig.h
 558
 559 # Use LINUXINCLUDE when you must reference the include/ directory.
 560 # Needed to be compatible with the O= option
 561 LINUXINCLUDE    := \
 562                 -I$(srctree)/arch/$(SRCARCH)/include \
 563                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 564                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 565                 -I$(objtree)/include \
 566                 $(USERINCLUDE)
 567
 568 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 569 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 570                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 571                    -Werror=implicit-function-declaration -Werror=implicit-int \
 572                    -Werror=return-type -Wno-format-security \
 573                    -std=gnu11
 574 KBUILD_CPPFLAGS := -D__KERNEL__
 575 KBUILD_RUSTFLAGS := $(rust_common_flags) \
 576                     --target=$(objtree)/rust/target.json \
 577                     -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 578                     -Cforce-unwind-tables=n -Ccodegen-units=1 \
 579                     -Csymbol-mangling-version=v0 \
 580                     -Crelocation-model=static \
 581                     -Zfunction-sections=n \
 582                     -Dclippy::float_arithmetic
 583
 584 KBUILD_AFLAGS_KERNEL :=
 585 KBUILD_CFLAGS_KERNEL :=
 586 KBUILD_RUSTFLAGS_KERNEL :=
 587 KBUILD_AFLAGS_MODULE  := -DMODULE
 588 KBUILD_CFLAGS_MODULE  := -DMODULE
 589 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 590 KBUILD_LDFLAGS_MODULE :=
 591 KBUILD_LDFLAGS :=
 592 CLANG_FLAGS :=
 593
 594 ifeq ($(KBUILD_CLIPPY),1)
 595         RUSTC_OR_CLIPPY_QUIET := CLIPPY
 596         RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 597 else
 598         RUSTC_OR_CLIPPY_QUIET := RUSTC
 599         RUSTC_OR_CLIPPY = $(RUSTC)
 600 endif
 601
 602 ifdef RUST_LIB_SRC
 603         export RUST_LIB_SRC
 604 endif
 605
 606 # Allows the usage of unstable features in stable compilers.
 607 export RUSTC_BOOTSTRAP := 1
 608
 609 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 610 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
 611 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 612 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 613 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 614 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 615 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 616 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 617
 618 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 619 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 620 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 621 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 622 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 623 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 624 export PAHOLE_FLAGS
 625
 626 # Files to ignore in find ... statements
 627
 628 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 629                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 630                           -prune -o
 631 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 632                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 633
 634 # ===========================================================================
 635 # Rules shared between *config targets and build targets
 636
 637 # Basic helpers built in scripts/basic/
 638 PHONY += scripts_basic
 639 scripts_basic:
 640         $(Q)$(MAKE) $(build)=scripts/basic
 641
 642 PHONY += outputmakefile
 643 ifdef building_out_of_srctree
 644 # Before starting out-of-tree build, make sure the source tree is clean.
 645 # outputmakefile generates a Makefile in the output directory, if using a
 646 # separate output directory. This allows convenient use of make in the
 647 # output directory.
 648 # At the same time when output Makefile generated, generate .gitignore to
 649 # ignore whole output directory
 650
 651 quiet_cmd_makefile = GEN     Makefile
 652       cmd_makefile = { \
 653         echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 654         echo "include $(srctree)/Makefile"; \
 655         } > Makefile
 656
 657 outputmakefile:
 658         @if [ -f $(srctree)/.config -o \
 659                  -d $(srctree)/include/config -o \
 660                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 661                 echo >&2 "***"; \
 662                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 663                 echo >&2 "*** in $(abs_srctree)";\
 664                 echo >&2 "***"; \
 665                 false; \
 666         fi
 667         $(Q)ln -fsn $(srctree) source
 668         $(call cmd,makefile)
 669         $(Q)test -e .gitignore || \
 670         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 671 endif
 672
 673 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 674 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 675 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 676 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 677 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 678
 679 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 680 include $(srctree)/scripts/Makefile.clang
 681 endif
 682
 683 # Include this also for config targets because some architectures need
 684 # cc-cross-prefix to determine CROSS_COMPILE.
 685 ifdef need-compiler
 686 include $(srctree)/scripts/Makefile.compiler
 687 endif
 688
 689 ifdef config-build
 690 # ===========================================================================
 691 # *config targets only - make sure prerequisites are updated, and descend
 692 # in scripts/kconfig to make the *config target
 693
 694 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 695 # KBUILD_DEFCONFIG may point out an alternative default configuration
 696 # used for 'make defconfig'
 697 include $(srctree)/arch/$(SRCARCH)/Makefile
 698 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 699
 700 config: outputmakefile scripts_basic FORCE
 701         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 702
 703 %config: outputmakefile scripts_basic FORCE
 704         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 705
 706 else #!config-build
 707 # ===========================================================================
 708 # Build targets only - this includes vmlinux, arch specific targets, clean
 709 # targets and others. In general all targets except *config targets.
 710
 711 # If building an external module we do not care about the all: rule
 712 # but instead __all depend on modules
 713 PHONY += all
 714 ifeq ($(KBUILD_EXTMOD),)
 715 __all: all
 716 else
 717 __all: modules
 718 endif
 719
 720 targets :=
 721
 722 # Decide whether to build built-in, modular, or both.
 723 # Normally, just do built-in.
 724
 725 KBUILD_MODULES :=
 726 KBUILD_BUILTIN := 1
 727
 728 # If we have only "make modules", don't compile built-in objects.
 729 ifeq ($(MAKECMDGOALS),modules)
 730   KBUILD_BUILTIN :=
 731 endif
 732
 733 # If we have "make <whatever> modules", compile modules
 734 # in addition to whatever we do anyway.
 735 # Just "make" or "make all" shall build modules as well
 736
 737 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 738   KBUILD_MODULES := 1
 739 endif
 740
 741 ifeq ($(MAKECMDGOALS),)
 742   KBUILD_MODULES := 1
 743 endif
 744
 745 export KBUILD_MODULES KBUILD_BUILTIN
 746
 747 ifdef need-config
 748 include include/config/auto.conf
 749 endif
 750
 751 ifeq ($(KBUILD_EXTMOD),)
 752 # Objects we will link into vmlinux / subdirs we need to visit
 753 core-y          :=
 754 drivers-y       :=
 755 libs-y          := lib/
 756 endif # KBUILD_EXTMOD
 757
 758 # The all: target is the default when no target is given on the
 759 # command line.
 760 # This allow a user to issue only 'make' to build a kernel including modules
 761 # Defaults to vmlinux, but the arch makefile usually adds further targets
 762 all: vmlinux
 763
 764 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 765 ifdef CONFIG_CC_IS_GCC
 766 CFLAGS_GCOV     += -fno-tree-loop-im
 767 endif
 768 export CFLAGS_GCOV
 769
 770 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 771 ifdef CONFIG_FUNCTION_TRACER
 772   CC_FLAGS_FTRACE := -pg
 773 endif
 774
 775 include $(srctree)/arch/$(SRCARCH)/Makefile
 776
 777 ifdef need-config
 778 ifdef may-sync-config
 779 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 780 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 781 # because some architectures define CROSS_COMPILE there.
 782 include include/config/auto.conf.cmd
 783
 784 $(KCONFIG_CONFIG):
 785         @echo >&2 '***'
 786         @echo >&2 '*** Configuration file "$@" not found!'
 787         @echo >&2 '***'
 788         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 789         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 790         @echo >&2 '***'
 791         @/bin/false
 792
 793 # The actual configuration files used during the build are stored in
 794 # include/generated/ and include/config/. Update them if .config is newer than
 795 # include/config/auto.conf (which mirrors .config).
 796 #
 797 # This exploits the 'multi-target pattern rule' trick.
 798 # The syncconfig should be executed only once to make all the targets.
 799 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 800 #
 801 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 802 # so you cannot notice that Kconfig is waiting for the user input.
 803 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 804         $(Q)$(kecho) "  SYNC    $@"
 805         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 806 else # !may-sync-config
 807 # External modules and some install targets need include/generated/autoconf.h
 808 # and include/config/auto.conf but do not care if they are up-to-date.
 809 # Use auto.conf to trigger the test
 810 PHONY += include/config/auto.conf
 811
 812 include/config/auto.conf:
 813         @test -e include/generated/autoconf.h -a -e $@ || (             \
 814         echo >&2;                                                       \
 815         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 816         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 817         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 818         echo >&2 ;                                                      \
 819         /bin/false)
 820
 821 endif # may-sync-config
 822 endif # need-config
 823
 824 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 825 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 826 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 827 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 828 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 829
 830 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 831 KBUILD_CFLAGS += -O2
 832 KBUILD_RUSTFLAGS += -Copt-level=2
 833 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 834 KBUILD_CFLAGS += -Os
 835 KBUILD_RUSTFLAGS += -Copt-level=s
 836 endif
 837
 838 # Always set `debug-assertions` and `overflow-checks` because their default
 839 # depends on `opt-level` and `debug-assertions`, respectively.
 840 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 841 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 842
 843 # Tell gcc to never replace conditional load with a non-conditional one
 844 ifdef CONFIG_CC_IS_GCC
 845 # gcc-10 renamed --param=allow-store-data-races=0 to
 846 # -fno-allow-store-data-races.
 847 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 848 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 849 endif
 850
 851 ifdef CONFIG_READABLE_ASM
 852 # Disable optimizations that make assembler listings hard to read.
 853 # reorder blocks reorders the control in the function
 854 # ipa clone creates specialized cloned functions
 855 # partial inlining inlines only parts of functions
 856 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 857 endif
 858
 859 ifneq ($(CONFIG_FRAME_WARN),0)
 860 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 861 endif
 862
 863 stackp-flags-y                                    := -fno-stack-protector
 864 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 865 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 866
 867 KBUILD_CFLAGS += $(stackp-flags-y)
 868
 869 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
 870 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
 871
 872 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 873 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 874
 875 ifdef CONFIG_CC_IS_CLANG
 876 KBUILD_CPPFLAGS += -Qunused-arguments
 877 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
 878 KBUILD_CFLAGS += -Wno-gnu
 879 else
 880
 881 # gcc inanely warns about local variables called 'main'
 882 KBUILD_CFLAGS += -Wno-main
 883 endif
 884
 885 # These warnings generated too much noise in a regular build.
 886 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 887 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 888 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 889
 890 # These result in bogus false positives
 891 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
 892
 893 ifdef CONFIG_FRAME_POINTER
 894 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 895 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 896 else
 897 # Some targets (ARM with Thumb2, for example), can't be built with frame
 898 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 899 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 900 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 901 # -fomit-frame-pointer with FUNCTION_TRACER.
 902 # In the Rust target specification, "frame-pointer" is set explicitly
 903 # to "may-omit".
 904 ifndef CONFIG_FUNCTION_TRACER
 905 KBUILD_CFLAGS   += -fomit-frame-pointer
 906 endif
 907 endif
 908
 909 # Initialize all stack variables with a 0xAA pattern.
 910 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 911 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 912 endif
 913
 914 # Initialize all stack variables with a zero value.
 915 ifdef CONFIG_INIT_STACK_ALL_ZERO
 916 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 917 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 918 # https://github.com/llvm/llvm-project/issues/44842
 919 KBUILD_CFLAGS   += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 920 endif
 921 endif
 922
 923 # While VLAs have been removed, GCC produces unreachable stack probes
 924 # for the randomize_kstack_offset feature. Disable it for all compilers.
 925 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 926
 927 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 928 ifdef CONFIG_ZERO_CALL_USED_REGS
 929 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 930 endif
 931
 932 ifdef CONFIG_FUNCTION_TRACER
 933 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 934   CC_FLAGS_FTRACE       += -mrecord-mcount
 935   ifdef CONFIG_HAVE_NOP_MCOUNT
 936     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 937       CC_FLAGS_FTRACE   += -mnop-mcount
 938       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 939     endif
 940   endif
 941 endif
 942 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 943   CC_FLAGS_USING        += -DCC_USING_NOP_MCOUNT
 944 endif
 945 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 946   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 947     BUILD_C_RECORDMCOUNT := y
 948     export BUILD_C_RECORDMCOUNT
 949   endif
 950 endif
 951 ifdef CONFIG_HAVE_FENTRY
 952   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 953   ifeq ($(call cc-option-yn, -mfentry),y)
 954     CC_FLAGS_FTRACE     += -mfentry
 955     CC_FLAGS_USING      += -DCC_USING_FENTRY
 956   endif
 957 endif
 958 export CC_FLAGS_FTRACE
 959 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 960 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 961 endif
 962
 963 # We trigger additional mismatches with less inlining
 964 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 965 KBUILD_CFLAGS += -fno-inline-functions-called-once
 966 endif
 967
 968 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 969 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 970 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 971 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 972 LDFLAGS_vmlinux += --gc-sections
 973 endif
 974
 975 ifdef CONFIG_SHADOW_CALL_STACK
 976 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 977 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 978 export CC_FLAGS_SCS
 979 endif
 980
 981 ifdef CONFIG_LTO_CLANG
 982 ifdef CONFIG_LTO_CLANG_THIN
 983 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 984 KBUILD_LDFLAGS  += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 985 else
 986 CC_FLAGS_LTO    := -flto
 987 endif
 988 CC_FLAGS_LTO    += -fvisibility=hidden
 989
 990 # Limit inlining across translation units to reduce binary size
 991 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 992
 993 # Check for frame size exceeding threshold during prolog/epilog insertion
 994 # when using lld < 13.0.0.
 995 ifneq ($(CONFIG_FRAME_WARN),0)
 996 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
 997 KBUILD_LDFLAGS  += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
 998 endif
 999 endif
1000 endif
1001
1002 ifdef CONFIG_LTO
1003 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
1004 KBUILD_AFLAGS   += -fno-lto
1005 export CC_FLAGS_LTO
1006 endif
1007
1008 ifdef CONFIG_CFI_CLANG
1009 CC_FLAGS_CFI    := -fsanitize=kcfi
1010 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
1011 export CC_FLAGS_CFI
1012 endif
1013
1014 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
1015 KBUILD_CFLAGS += -falign-functions=64
1016 endif
1017
1018 # arch Makefile may override CC so keep this after arch Makefile is included
1019 NOSTDINC_FLAGS += -nostdinc
1020
1021 # warn about C99 declaration after statement
1022 KBUILD_CFLAGS += -Wdeclaration-after-statement
1023
1024 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1025 KBUILD_CFLAGS += -Wvla
1026
1027 # disable pointer signed / unsigned warnings in gcc 4.0
1028 KBUILD_CFLAGS += -Wno-pointer-sign
1029
1030 # In order to make sure new function cast mismatches are not introduced
1031 # in the kernel (to avoid tripping CFI checking), the kernel should be
1032 # globally built with -Wcast-function-type.
1033 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
1034
1035 # disable stringop warnings in gcc 8+
1036 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1037
1038 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1039 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1040
1041 # Another good warning that we'll want to enable eventually
1042 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1043
1044 # Enabled with W=2, disabled by default as noisy
1045 ifdef CONFIG_CC_IS_GCC
1046 KBUILD_CFLAGS += -Wno-maybe-uninitialized
1047 endif
1048
1049 # The allocators already balk at large sizes, so silence the compiler
1050 # warnings for bounds checks involving those possible values. While
1051 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1052 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1053 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1054 # doesn't work (as it is documented to), silently resolving to "0" prior to
1055 # version 9.1 (and producing an error more recently). Numeric values larger
1056 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1057 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1058 # choice, we must perform a versioned check to disable this warning.
1059 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1060 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
1061 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
1062
1063 # disable invalid "can't wrap" optimizations for signed / pointers
1064 KBUILD_CFLAGS   += -fno-strict-overflow
1065
1066 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1067 KBUILD_CFLAGS  += -fno-stack-check
1068
1069 # conserve stack if available
1070 ifdef CONFIG_CC_IS_GCC
1071 KBUILD_CFLAGS   += -fconserve-stack
1072 endif
1073
1074 # Prohibit date/time macros, which would make the build non-deterministic
1075 KBUILD_CFLAGS   += -Werror=date-time
1076
1077 # enforce correct pointer usage
1078 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
1079
1080 # Require designated initializers for all marked structures
1081 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
1082
1083 # change __FILE__ to the relative path from the srctree
1084 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1085
1086 # include additional Makefiles when needed
1087 include-y                       := scripts/Makefile.extrawarn
1088 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1089 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1090 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1091 include-$(CONFIG_KMSAN)         += scripts/Makefile.kmsan
1092 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1093 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1094 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1095 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1096
1097 include $(addprefix $(srctree)/, $(include-y))
1098
1099 # scripts/Makefile.gcc-plugins is intentionally included last.
1100 # Do not add $(call cc-option,...) below this line. When you build the kernel
1101 # from the clean source tree, the GCC plugins do not exist at this point.
1102
1103 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1104 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1105 KBUILD_AFLAGS   += $(KAFLAGS)
1106 KBUILD_CFLAGS   += $(KCFLAGS)
1107 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1108
1109 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1110 LDFLAGS_vmlinux += --build-id=sha1
1111
1112 KBUILD_LDFLAGS  += -z noexecstack
1113 ifeq ($(CONFIG_LD_IS_BFD),y)
1114 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
1115 endif
1116
1117 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1118 LDFLAGS_vmlinux += -X
1119 endif
1120
1121 ifeq ($(CONFIG_RELR),y)
1122 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1123 endif
1124
1125 # We never want expected sections to be placed heuristically by the
1126 # linker. All sections should be explicitly named in the linker script.
1127 ifdef CONFIG_LD_ORPHAN_WARN
1128 LDFLAGS_vmlinux += --orphan-handling=warn
1129 endif
1130
1131 # Align the bit size of userspace programs with the kernel
1132 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1133 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1134
1135 # make the checker run with the right architecture
1136 CHECKFLAGS += --arch=$(ARCH)
1137
1138 # insure the checker run with the right endianness
1139 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1140
1141 # the checker needs the correct machine size
1142 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1143
1144 # Default kernel image to build when no specific target is given.
1145 # KBUILD_IMAGE may be overruled on the command line or
1146 # set in the environment
1147 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1148 # this default value
1149 export KBUILD_IMAGE ?= vmlinux
1150
1151 #
1152 # INSTALL_PATH specifies where to place the updated kernel and system map
1153 # images. Default is /boot, but you can set it to other values
1154 export  INSTALL_PATH ?= /boot
1155
1156 #
1157 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1158 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1159 # an argument if needed. Otherwise it defaults to the kernel install path
1160 #
1161 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1162
1163 #
1164 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1165 # relocations required by build roots.  This is not defined in the
1166 # makefile but the argument can be passed to make if needed.
1167 #
1168
1169 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1170 export MODLIB
1171
1172 PHONY += prepare0
1173
1174 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1175 export MODORDER := $(extmod_prefix)modules.order
1176 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1177
1178 ifeq ($(KBUILD_EXTMOD),)
1179
1180 build-dir       := .
1181 clean-dirs      := $(sort . Documentation \
1182                      $(patsubst %/,%,$(filter %/, $(core-) \
1183                         $(drivers-) $(libs-))))
1184
1185 export ARCH_CORE        := $(core-y)
1186 export ARCH_LIB         := $(filter %/, $(libs-y))
1187 export ARCH_DRIVERS     := $(drivers-y) $(drivers-m)
1188 # Externally visible symbols (used by link-vmlinux.sh)
1189
1190 KBUILD_VMLINUX_OBJS := ./built-in.a
1191 ifdef CONFIG_MODULES
1192 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1193 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1194 else
1195 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1196 endif
1197
1198 export KBUILD_VMLINUX_LIBS
1199 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1200
1201 # Recurse until adjust_autoksyms.sh is satisfied
1202 PHONY += autoksyms_recursive
1203 ifdef CONFIG_TRIM_UNUSED_KSYMS
1204 # For the kernel to actually contain only the needed exported symbols,
1205 # we have to build modules as well to determine what those symbols are.
1206 # (this can be evaluated only once include/config/auto.conf has been included)
1207 KBUILD_MODULES := 1
1208
1209 autoksyms_recursive: $(build-dir) modules.order
1210         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1211           "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1212 endif
1213
1214 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1215
1216 quiet_cmd_autoksyms_h = GEN     $@
1217       cmd_autoksyms_h = mkdir -p $(dir $@); \
1218                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1219
1220 $(autoksyms_h):
1221         $(call cmd,autoksyms_h)
1222
1223 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1224 quiet_cmd_ar_vmlinux.a = AR      $@
1225       cmd_ar_vmlinux.a = \
1226         rm -f $@; \
1227         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1228         $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1229
1230 targets += vmlinux.a
1231 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
1232         $(call if_changed,ar_vmlinux.a)
1233
1234 PHONY += vmlinux_o
1235 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1236         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1237
1238 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1239         @:
1240
1241 PHONY += vmlinux
1242 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1243 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1244 # unrelated; the decompressors just happen to have the same base name,
1245 # arch/*/boot/compressed/vmlinux.
1246 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1247 #
1248 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1249 #   https://savannah.gnu.org/bugs/?61463
1250 # For Make > 4.4, the following simple code will work:
1251 #  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1252 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1253 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1254 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1255         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1256
1257 # The actual objects are generated when descending,
1258 # make sure no implicit rule kicks in
1259 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1260
1261 filechk_kernel.release = \
1262         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1263
1264 # Store (new) KERNELRELEASE string in include/config/kernel.release
1265 include/config/kernel.release: FORCE
1266         $(call filechk,kernel.release)
1267
1268 # Additional helpers built in scripts/
1269 # Carefully list dependencies so we do not try to build scripts twice
1270 # in parallel
1271 PHONY += scripts
1272 scripts: scripts_basic scripts_dtc
1273         $(Q)$(MAKE) $(build)=$(@)
1274
1275 # Things we need to do before we recursively start building the kernel
1276 # or the modules are listed in "prepare".
1277 # A multi level approach is used. prepareN is processed before prepareN-1.
1278 # archprepare is used in arch Makefiles and when processed asm symlink,
1279 # version.h and scripts_basic is processed / created.
1280
1281 PHONY += prepare archprepare
1282
1283 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1284         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1285         include/generated/compile.h include/generated/autoconf.h remove-stale-files
1286
1287 prepare0: archprepare
1288         $(Q)$(MAKE) $(build)=scripts/mod
1289         $(Q)$(MAKE) $(build)=. prepare
1290
1291 # All the preparing..
1292 prepare: prepare0
1293 ifdef CONFIG_RUST
1294         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v
1295         $(Q)$(MAKE) $(build)=rust
1296 endif
1297
1298 PHONY += remove-stale-files
1299 remove-stale-files:
1300         $(Q)$(srctree)/scripts/remove-stale-files
1301
1302 # Support for using generic headers in asm-generic
1303 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1304
1305 PHONY += asm-generic uapi-asm-generic
1306 asm-generic: uapi-asm-generic
1307         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1308         generic=include/asm-generic
1309 uapi-asm-generic:
1310         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1311         generic=include/uapi/asm-generic
1312
1313 # Generate some files
1314 # ---------------------------------------------------------------------------
1315
1316 # KERNELRELEASE can change from a few different places, meaning version.h
1317 # needs to be updated, so this check is forced on all builds
1318
1319 uts_len := 64
1320 define filechk_utsrelease.h
1321         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1322           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1323           exit 1;                                                         \
1324         fi;                                                               \
1325         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1326 endef
1327
1328 define filechk_version.h
1329         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1330                 echo \#define LINUX_VERSION_CODE $(shell                 \
1331                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1332         else                                                             \
1333                 echo \#define LINUX_VERSION_CODE $(shell                 \
1334                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1335         fi;                                                              \
1336         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1337         ((c) > 255 ? 255 : (c)))';                                       \
1338         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1339         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1340         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1341 endef
1342
1343 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1344 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1345 $(version_h): FORCE
1346         $(call filechk,version.h)
1347
1348 include/generated/utsrelease.h: include/config/kernel.release FORCE
1349         $(call filechk,utsrelease.h)
1350
1351 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1352         "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1353
1354 include/generated/compile.h: FORCE
1355         $(call filechk,compile.h)
1356
1357 PHONY += headerdep
1358 headerdep:
1359         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1360         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1361
1362 # ---------------------------------------------------------------------------
1363 # Kernel headers
1364
1365 #Default location for installed headers
1366 export INSTALL_HDR_PATH = $(objtree)/usr
1367
1368 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1369       cmd_headers_install = \
1370         mkdir -p $(INSTALL_HDR_PATH); \
1371         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1372         usr/include $(INSTALL_HDR_PATH)
1373
1374 PHONY += headers_install
1375 headers_install: headers
1376         $(call cmd,headers_install)
1377
1378 PHONY += archheaders archscripts
1379
1380 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1381
1382 PHONY += headers
1383 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1384         $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1385         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1386         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1387
1388 ifdef CONFIG_HEADERS_INSTALL
1389 prepare: headers
1390 endif
1391
1392 PHONY += scripts_unifdef
1393 scripts_unifdef: scripts_basic
1394         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1395
1396 # ---------------------------------------------------------------------------
1397 # Install
1398
1399 # Many distributions have the custom install script, /sbin/installkernel.
1400 # If DKMS is installed, 'make install' will eventually recurse back
1401 # to this Makefile to build and install external modules.
1402 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1403
1404 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1405       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1406
1407 # ---------------------------------------------------------------------------
1408 # Tools
1409
1410 ifdef CONFIG_OBJTOOL
1411 prepare: tools/objtool
1412 endif
1413
1414 ifdef CONFIG_BPF
1415 ifdef CONFIG_DEBUG_INFO_BTF
1416 prepare: tools/bpf/resolve_btfids
1417 endif
1418 endif
1419
1420 PHONY += resolve_btfids_clean
1421
1422 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1423
1424 # tools/bpf/resolve_btfids directory might not exist
1425 # in output directory, skip its clean in that case
1426 resolve_btfids_clean:
1427 ifneq ($(wildcard $(resolve_btfids_O)),)
1428         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1429 endif
1430
1431 # Clear a bunch of variables before executing the submake
1432 ifeq ($(quiet),silent_)
1433 tools_silent=s
1434 endif
1435
1436 tools/: FORCE
1437         $(Q)mkdir -p $(objtree)/tools
1438         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1439
1440 tools/%: FORCE
1441         $(Q)mkdir -p $(objtree)/tools
1442         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1443
1444 # ---------------------------------------------------------------------------
1445 # Kernel selftest
1446
1447 PHONY += kselftest
1448 kselftest: headers
1449         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1450
1451 kselftest-%: headers FORCE
1452         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1453
1454 PHONY += kselftest-merge
1455 kselftest-merge:
1456         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1457         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1458                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1459         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1460
1461 # ---------------------------------------------------------------------------
1462 # Devicetree files
1463
1464 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1465 dtstree := arch/$(SRCARCH)/boot/dts
1466 endif
1467
1468 ifneq ($(dtstree),)
1469
1470 %.dtb: dtbs_prepare
1471         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1472
1473 %.dtbo: dtbs_prepare
1474         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1475
1476 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1477 dtbs: dtbs_prepare
1478         $(Q)$(MAKE) $(build)=$(dtstree)
1479
1480 # include/config/kernel.release is actually needed when installing DTBs because
1481 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1482 # dtbs_install depend on it as dtbs_install may run as root.
1483 dtbs_prepare: include/config/kernel.release scripts_dtc
1484
1485 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1486 export CHECK_DTBS=y
1487 dtbs: dt_binding_check
1488 endif
1489
1490 dtbs_check: dtbs
1491
1492 dtbs_install:
1493         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1494
1495 ifdef CONFIG_OF_EARLY_FLATTREE
1496 all: dtbs
1497 endif
1498
1499 endif
1500
1501 PHONY += scripts_dtc
1502 scripts_dtc: scripts_basic
1503         $(Q)$(MAKE) $(build)=scripts/dtc
1504
1505 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1506 export CHECK_DT_BINDING=y
1507 endif
1508
1509 PHONY += dt_binding_check
1510 dt_binding_check: scripts_dtc
1511         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1512
1513 PHONY += dt_compatible_check
1514 dt_compatible_check: dt_binding_check
1515         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1516
1517 # ---------------------------------------------------------------------------
1518 # Modules
1519
1520 ifdef CONFIG_MODULES
1521
1522 # By default, build modules as well
1523
1524 all: modules
1525
1526 # When we're building modules with modversions, we need to consider
1527 # the built-in objects during the descend as well, in order to
1528 # make sure the checksums are up to date before we record them.
1529 ifdef CONFIG_MODVERSIONS
1530   KBUILD_BUILTIN := 1
1531 endif
1532
1533 # Build modules
1534 #
1535
1536 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
1537 # is an exception.
1538 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1539 KBUILD_BUILTIN := 1
1540 modules: vmlinux
1541 endif
1542
1543 modules: modules_prepare
1544
1545 # Target to prepare building external modules
1546 modules_prepare: prepare
1547         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1548
1549 export modules_sign_only :=
1550
1551 ifeq ($(CONFIG_MODULE_SIG),y)
1552 PHONY += modules_sign
1553 modules_sign: modules_install
1554         @:
1555
1556 # modules_sign is a subset of modules_install.
1557 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1558 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1559 modules_sign_only := y
1560 endif
1561 endif
1562
1563 modinst_pre :=
1564 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1565 modinst_pre := __modinst_pre
1566 endif
1567
1568 modules_install: $(modinst_pre)
1569 PHONY += __modinst_pre
1570 __modinst_pre:
1571         @rm -rf $(MODLIB)/kernel
1572         @rm -f $(MODLIB)/source
1573         @mkdir -p $(MODLIB)/kernel
1574         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1575         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1576                 rm -f $(MODLIB)/build ; \
1577                 ln -s $(CURDIR) $(MODLIB)/build ; \
1578         fi
1579         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1580         @cp -f modules.builtin $(MODLIB)/
1581         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1582
1583 endif # CONFIG_MODULES
1584
1585 ###
1586 # Cleaning is done on three levels.
1587 # make clean     Delete most generated files
1588 #                Leave enough to build external modules
1589 # make mrproper  Delete the current configuration, and all generated files
1590 # make distclean Remove editor backup files, patch leftover files and the like
1591
1592 # Directories & files removed with 'make clean'
1593 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1594                modules.builtin modules.builtin.modinfo modules.nsdeps \
1595                compile_commands.json .thinlto-cache rust/test rust/doc \
1596                .vmlinux.objs .vmlinux.export.c
1597
1598 # Directories & files removed with 'make mrproper'
1599 MRPROPER_FILES += include/config include/generated          \
1600                   arch/$(SRCARCH)/include/generated .objdiff \
1601                   debian snap tar-install \
1602                   .config .config.old .version \
1603                   Module.symvers \
1604                   certs/signing_key.pem \
1605                   certs/x509.genkey \
1606                   vmlinux-gdb.py \
1607                   *.spec \
1608                   rust/target.json rust/libmacros.so
1609
1610 # clean - Delete most, but leave enough to build external modules
1611 #
1612 clean: rm-files := $(CLEAN_FILES)
1613
1614 PHONY += archclean vmlinuxclean
1615
1616 vmlinuxclean:
1617         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1618         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1619
1620 clean: archclean vmlinuxclean resolve_btfids_clean
1621
1622 # mrproper - Delete all generated files, including .config
1623 #
1624 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1625 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1626
1627 PHONY += $(mrproper-dirs) mrproper
1628 $(mrproper-dirs):
1629         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1630
1631 mrproper: clean $(mrproper-dirs)
1632         $(call cmd,rmfiles)
1633         @find . $(RCS_FIND_IGNORE) \
1634                 \( -name '*.rmeta' \) \
1635                 -type f -print | xargs rm -f
1636
1637 # distclean
1638 #
1639 PHONY += distclean
1640
1641 distclean: mrproper
1642         @find . $(RCS_FIND_IGNORE) \
1643                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1644                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1645                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1646                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1647                 -type f -print | xargs rm -f
1648
1649
1650 # Packaging of the kernel to various formats
1651 # ---------------------------------------------------------------------------
1652
1653 %src-pkg: FORCE
1654         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1655 %pkg: include/config/kernel.release FORCE
1656         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1657
1658 # Brief documentation of the typical targets used
1659 # ---------------------------------------------------------------------------
1660
1661 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1662 boards := $(sort $(notdir $(boards)))
1663 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1664 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1665
1666 PHONY += help
1667 help:
1668         @echo  'Cleaning targets:'
1669         @echo  '  clean           - Remove most generated files but keep the config and'
1670         @echo  '                    enough build support to build external modules'
1671         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1672         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1673         @echo  ''
1674         @echo  'Configuration targets:'
1675         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1676         @echo  ''
1677         @echo  'Other generic targets:'
1678         @echo  '  all             - Build all targets marked with [*]'
1679         @echo  '* vmlinux         - Build the bare kernel'
1680         @echo  '* modules         - Build all modules'
1681         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1682         @echo  '  dir/            - Build all files in dir and below'
1683         @echo  '  dir/file.[ois]  - Build specified target only'
1684         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1685         @echo  '                    (requires compiler support for LLVM assembly generation)'
1686         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1687         @echo  '                    (requires a recent binutils and recent build (System.map))'
1688         @echo  '  dir/file.ko     - Build module including final link'
1689         @echo  '  modules_prepare - Set up for building external modules'
1690         @echo  '  tags/TAGS       - Generate tags file for editors'
1691         @echo  '  cscope          - Generate cscope index'
1692         @echo  '  gtags           - Generate GNU GLOBAL index'
1693         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1694         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1695         @echo  '  image_name      - Output the image name (use with make -s)'
1696         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1697          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1698          echo  ''
1699         @echo  'Static analysers:'
1700         @echo  '  checkstack      - Generate a list of stack hogs'
1701         @echo  '  versioncheck    - Sanity check on version.h usage'
1702         @echo  '  includecheck    - Check for duplicate included header files'
1703         @echo  '  export_report   - List the usages of all exported symbols'
1704         @echo  '  headerdep       - Detect inclusion cycles in headers'
1705         @echo  '  coccicheck      - Check with Coccinelle'
1706         @echo  '  clang-analyzer  - Check with clang static analyzer'
1707         @echo  '  clang-tidy      - Check with clang-tidy'
1708         @echo  ''
1709         @echo  'Tools:'
1710         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1711         @echo  ''
1712         @echo  'Kernel selftest:'
1713         @echo  '  kselftest         - Build and run kernel selftest'
1714         @echo  '                      Build, install, and boot kernel before'
1715         @echo  '                      running kselftest on it'
1716         @echo  '                      Run as root for full coverage'
1717         @echo  '  kselftest-all     - Build kernel selftest'
1718         @echo  '  kselftest-install - Build and install kernel selftest'
1719         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1720         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1721         @echo  '                      kselftest to existing .config.'
1722         @echo  ''
1723         @echo  'Rust targets:'
1724         @echo  '  rustavailable   - Checks whether the Rust toolchain is'
1725         @echo  '                    available and, if not, explains why.'
1726         @echo  '  rustfmt         - Reformat all the Rust code in the kernel'
1727         @echo  '  rustfmtcheck    - Checks if all the Rust code in the kernel'
1728         @echo  '                    is formatted, printing a diff otherwise.'
1729         @echo  '  rustdoc         - Generate Rust documentation'
1730         @echo  '                    (requires kernel .config)'
1731         @echo  '  rusttest        - Runs the Rust tests'
1732         @echo  '                    (requires kernel .config; downloads external repos)'
1733         @echo  '  rust-analyzer   - Generate rust-project.json rust-analyzer support file'
1734         @echo  '                    (requires kernel .config)'
1735         @echo  '  dir/file.[os]   - Build specified target only'
1736         @echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1737         @echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1738         @echo  '                    The output is not intended to be compilable.'
1739         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1740         @echo  ''
1741         @$(if $(dtstree), \
1742                 echo 'Devicetree:'; \
1743                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1744                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1745                 echo '  dt_binding_check - Validate device tree binding documents'; \
1746                 echo '  dtbs_check       - Validate device tree source files';\
1747                 echo '')
1748
1749         @echo 'Userspace tools targets:'
1750         @echo '  use "make tools/help"'
1751         @echo '  or  "cd tools; make help"'
1752         @echo  ''
1753         @echo  'Kernel packaging:'
1754         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1755         @echo  ''
1756         @echo  'Documentation targets:'
1757         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1758         @echo  ''
1759         @echo  'Architecture specific targets ($(SRCARCH)):'
1760         @$(or $(archhelp),\
1761                 echo '  No architecture specific help defined for $(SRCARCH)')
1762         @echo  ''
1763         @$(if $(boards), \
1764                 $(foreach b, $(boards), \
1765                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1766                 echo '')
1767         @$(if $(board-dirs), \
1768                 $(foreach b, $(board-dirs), \
1769                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1770                 printf "  %-16s - Show all of the above\\n" help-boards; \
1771                 echo '')
1772
1773         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1774         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1775         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1776         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1777         @echo  '                       (sparse by default)'
1778         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1779         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1780         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1781         @echo  '                1: warnings which may be relevant and do not occur too often'
1782         @echo  '                2: warnings which occur quite often but may still be relevant'
1783         @echo  '                3: more obscure warnings, can most likely be ignored'
1784         @echo  '                e: warnings are being treated as errors'
1785         @echo  '                Multiple levels can be combined with W=12 or W=123'
1786         @echo  ''
1787         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1788         @echo  'For further info see the ./README file'
1789
1790
1791 help-board-dirs := $(addprefix help-,$(board-dirs))
1792
1793 help-boards: $(help-board-dirs)
1794
1795 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1796
1797 $(help-board-dirs): help-%:
1798         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1799         @$(if $(boards-per-dir), \
1800                 $(foreach b, $(boards-per-dir), \
1801                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1802                 echo '')
1803
1804
1805 # Documentation targets
1806 # ---------------------------------------------------------------------------
1807 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1808                linkcheckdocs dochelp refcheckdocs
1809 PHONY += $(DOC_TARGETS)
1810 $(DOC_TARGETS):
1811         $(Q)$(MAKE) $(build)=Documentation $@
1812
1813
1814 # Rust targets
1815 # ---------------------------------------------------------------------------
1816
1817 # "Is Rust available?" target
1818 PHONY += rustavailable
1819 rustavailable:
1820         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!"
1821
1822 # Documentation target
1823 #
1824 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1825 PHONY += rustdoc
1826 rustdoc: prepare
1827         $(Q)$(MAKE) $(build)=rust $@
1828
1829 # Testing target
1830 PHONY += rusttest
1831 rusttest: prepare
1832         $(Q)$(MAKE) $(build)=rust $@
1833
1834 # Formatting targets
1835 PHONY += rustfmt rustfmtcheck
1836
1837 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1838 #
1839 # We match using absolute paths since `find` does not resolve them
1840 # when matching, which is a problem when e.g. `srctree` is `..`.
1841 # We `grep` afterwards in order to remove the directory entry itself.
1842 rustfmt:
1843         $(Q)find $(abs_srctree) -type f -name '*.rs' \
1844                 -o -path $(abs_srctree)/rust/alloc -prune \
1845                 -o -path $(abs_objtree)/rust/test -prune \
1846                 | grep -Fv $(abs_srctree)/rust/alloc \
1847                 | grep -Fv $(abs_objtree)/rust/test \
1848                 | grep -Fv generated \
1849                 | xargs $(RUSTFMT) $(rustfmt_flags)
1850
1851 rustfmtcheck: rustfmt_flags = --check
1852 rustfmtcheck: rustfmt
1853
1854 # IDE support targets
1855 PHONY += rust-analyzer
1856 rust-analyzer:
1857         $(Q)$(MAKE) $(build)=rust $@
1858
1859 # Misc
1860 # ---------------------------------------------------------------------------
1861
1862 PHONY += scripts_gdb
1863 scripts_gdb: prepare0
1864         $(Q)$(MAKE) $(build)=scripts/gdb
1865         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1866
1867 ifdef CONFIG_GDB_SCRIPTS
1868 all: scripts_gdb
1869 endif
1870
1871 else # KBUILD_EXTMOD
1872
1873 ###
1874 # External module support.
1875 # When building external modules the kernel used as basis is considered
1876 # read-only, and no consistency checks are made and the make
1877 # system is not used on the basis kernel. If updates are required
1878 # in the basis kernel ordinary make commands (without M=...) must be used.
1879
1880 # We are always building only modules.
1881 KBUILD_BUILTIN :=
1882 KBUILD_MODULES := 1
1883
1884 build-dir := $(KBUILD_EXTMOD)
1885
1886 compile_commands.json: $(extmod_prefix)compile_commands.json
1887 PHONY += compile_commands.json
1888
1889 clean-dirs := $(KBUILD_EXTMOD)
1890 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1891         $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1892
1893 PHONY += prepare
1894 # now expand this into a simple variable to reduce the cost of shell evaluations
1895 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1896 prepare:
1897         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1898                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1899                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1900                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1901         fi
1902
1903 PHONY += help
1904 help:
1905         @echo  '  Building external modules.'
1906         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1907         @echo  ''
1908         @echo  '  modules         - default target, build the module(s)'
1909         @echo  '  modules_install - install the module'
1910         @echo  '  clean           - remove generated files in module directory only'
1911         @echo  ''
1912
1913 endif # KBUILD_EXTMOD
1914
1915 # ---------------------------------------------------------------------------
1916 # Modules
1917
1918 PHONY += modules modules_install modules_prepare
1919
1920 ifdef CONFIG_MODULES
1921
1922 $(MODORDER): $(build-dir)
1923         @:
1924
1925 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1926 # This is solely useful to speed up test compiles.
1927 modules: modpost
1928 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1929         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1930 endif
1931
1932 PHONY += modules_check
1933 modules_check: $(MODORDER)
1934         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1935
1936 quiet_cmd_depmod = DEPMOD  $(MODLIB)
1937       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1938                    $(KERNELRELEASE)
1939
1940 modules_install:
1941         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1942         $(call cmd,depmod)
1943
1944 else # CONFIG_MODULES
1945
1946 # Modules not configured
1947 # ---------------------------------------------------------------------------
1948
1949 modules modules_install:
1950         @echo >&2 '***'
1951         @echo >&2 '*** The present kernel configuration has modules disabled.'
1952         @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1953         @echo >&2 '*** to enable CONFIG_MODULES.'
1954         @echo >&2 '***'
1955         @exit 1
1956
1957 KBUILD_MODULES :=
1958
1959 endif # CONFIG_MODULES
1960
1961 PHONY += modpost
1962 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1963          $(if $(KBUILD_MODULES), modules_check)
1964         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1965
1966 # Single targets
1967 # ---------------------------------------------------------------------------
1968 # To build individual files in subdirectories, you can do like this:
1969 #
1970 #   make foo/bar/baz.s
1971 #
1972 # The supported suffixes for single-target are listed in 'single-targets'
1973 #
1974 # To build only under specific subdirectories, you can do like this:
1975 #
1976 #   make foo/bar/baz/
1977
1978 ifdef single-build
1979
1980 # .ko is special because modpost is needed
1981 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1982 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1983                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1984
1985 $(single-ko): single_modules
1986         @:
1987 $(single-no-ko): $(build-dir)
1988         @:
1989
1990 # Remove MODORDER when done because it is not the real one.
1991 PHONY += single_modules
1992 single_modules: $(single-no-ko) modules_prepare
1993         $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1994         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1995 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1996         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1997 endif
1998         $(Q)rm -f $(MODORDER)
1999
2000 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
2001
2002 KBUILD_MODULES := 1
2003
2004 endif
2005
2006 # Preset locale variables to speed up the build process. Limit locale
2007 # tweaks to this spot to avoid wrong language settings when running
2008 # make menuconfig etc.
2009 # Error messages still appears in the original language
2010 PHONY += $(build-dir)
2011 $(build-dir): prepare
2012         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2013
2014 clean-dirs := $(addprefix _clean_, $(clean-dirs))
2015 PHONY += $(clean-dirs) clean
2016 $(clean-dirs):
2017         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2018
2019 clean: $(clean-dirs)
2020         $(call cmd,rmfiles)
2021         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
2022                 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2023                 -o -name '*.ko.*' \
2024                 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
2025                 -o -name '*.dwo' -o -name '*.lst' \
2026                 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
2027                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2028                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2029                 -o -name '*.asn1.[ch]' \
2030                 -o -name '*.symtypes' -o -name 'modules.order' \
2031                 -o -name '.tmp_*' \
2032                 -o -name '*.c.[012]*.*' \
2033                 -o -name '*.ll' \
2034                 -o -name '*.gcno' \
2035                 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
2036
2037 # Generate tags for editors
2038 # ---------------------------------------------------------------------------
2039 quiet_cmd_tags = GEN     $@
2040       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2041
2042 tags TAGS cscope gtags: FORCE
2043         $(call cmd,tags)
2044
2045 # Script to generate missing namespace dependencies
2046 # ---------------------------------------------------------------------------
2047
2048 PHONY += nsdeps
2049 nsdeps: export KBUILD_NSDEPS=1
2050 nsdeps: modules
2051         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2052
2053 # Clang Tooling
2054 # ---------------------------------------------------------------------------
2055
2056 quiet_cmd_gen_compile_commands = GEN     $@
2057       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2058
2059 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
2060         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2061         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2062         $(call if_changed,gen_compile_commands)
2063
2064 targets += $(extmod_prefix)compile_commands.json
2065
2066 PHONY += clang-tidy clang-analyzer
2067
2068 ifdef CONFIG_CC_IS_CLANG
2069 quiet_cmd_clang_tools = CHECK   $<
2070       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2071
2072 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2073         $(call cmd,clang_tools)
2074 else
2075 clang-tidy clang-analyzer:
2076         @echo "$@ requires CC=clang" >&2
2077         @false
2078 endif
2079
2080 # Scripts to check various things for consistency
2081 # ---------------------------------------------------------------------------
2082
2083 PHONY += includecheck versioncheck coccicheck export_report
2084
2085 includecheck:
2086         find $(srctree)/* $(RCS_FIND_IGNORE) \
2087                 -name '*.[hcS]' -type f -print | sort \
2088                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2089
2090 versioncheck:
2091         find $(srctree)/* $(RCS_FIND_IGNORE) \
2092                 -name '*.[hcS]' -type f -print | sort \
2093                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2094
2095 coccicheck:
2096         $(Q)$(BASH) $(srctree)/scripts/$@
2097
2098 export_report:
2099         $(PERL) $(srctree)/scripts/export_report.pl
2100
2101 PHONY += checkstack kernelrelease kernelversion image_name
2102
2103 # UML needs a little special treatment here.  It wants to use the host
2104 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2105 # else wants $(ARCH), including people doing cross-builds, which means
2106 # that $(SUBARCH) doesn't work here.
2107 ifeq ($(ARCH), um)
2108 CHECKSTACK_ARCH := $(SUBARCH)
2109 else
2110 CHECKSTACK_ARCH := $(ARCH)
2111 endif
2112 checkstack:
2113         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2114         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2115
2116 kernelrelease:
2117         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2118
2119 kernelversion:
2120         @echo $(KERNELVERSION)
2121
2122 image_name:
2123         @echo $(KBUILD_IMAGE)
2124
2125 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2126       cmd_rmfiles = rm -rf $(rm-files)
2127
2128 # read saved command lines for existing targets
2129 existing-targets := $(wildcard $(sort $(targets)))
2130
2131 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2132
2133 endif # config-build
2134 endif # mixed-build
2135 endif # need-sub-make
2136
2137 PHONY += FORCE
2138 FORCE:
2139
2140 # Declare the contents of the PHONY variable as phony.  We keep that
2141 # information in a variable so we can use it in if_changed and friends.
2142 .PHONY: $(PHONY)