Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 6
   3 PATCHLEVEL = 13
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc4
   6 NAME = Baby Opossum Posse
   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 ifeq ($(filter output-sync,$(.FEATURES)),)
  15 $(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION))
  16 endif
  17
  18 $(if $(filter __%, $(MAKECMDGOALS)), \
  19         $(error targets prefixed with '__' are only for internal use))
  20
  21 # That's our default target when none is given on the command line
  22 PHONY := __all
  23 __all:
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.a targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 this-makefile := $(lastword $(MAKEFILE_LIST))
  42 abs_srctree := $(realpath $(dir $(this-makefile)))
  43 abs_output := $(CURDIR)
  44
  45 ifneq ($(sub_make_done),1)
  46
  47 # Do not use make's built-in rules and variables
  48 # (this increases performance and avoids hard-to-debug behaviour)
  49 MAKEFLAGS += -rR
  50
  51 # Avoid funny character set dependencies
  52 unexport LC_ALL
  53 LC_COLLATE=C
  54 LC_NUMERIC=C
  55 export LC_COLLATE LC_NUMERIC
  56
  57 # Avoid interference with shell env settings
  58 unexport GREP_OPTIONS
  59
  60 # Beautify output
  61 # ---------------------------------------------------------------------------
  62 #
  63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
  64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
  65 # that command is printed by default.
  66 #
  67 # e.g.)
  68 #    quiet_cmd_depmod = DEPMOD  $(MODLIB)
  69 #          cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
  70 #
  71 # A simple variant is to prefix commands with $(Q) - that's useful
  72 # for commands that shall be hidden in non-verbose mode.
  73 #
  74 #    $(Q)$(MAKE) $(build)=scripts/basic
  75 #
  76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
  77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
  78 #
  79 # To put more focus on warnings, be less verbose as default
  80 # Use 'make V=1' to see the full commands
  81
  82 ifeq ("$(origin V)", "command line")
  83   KBUILD_VERBOSE = $(V)
  84 endif
  85
  86 quiet = quiet_
  87 Q = @
  88
  89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
  90   quiet =
  91   Q =
  92 endif
  93
  94 # If the user is running make -s (silent mode), suppress echoing of
  95 # commands
  96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),)
  97 quiet=silent_
  98 override KBUILD_VERBOSE :=
  99 endif
 100
 101 export quiet Q KBUILD_VERBOSE
 102
 103 # Call a source code checker (by default, "sparse") as part of the
 104 # C compilation.
 105 #
 106 # Use 'make C=1' to enable checking of only re-compiled files.
 107 # Use 'make C=2' to enable checking of *all* source files, regardless
 108 # of whether they are re-compiled or not.
 109 #
 110 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 111 # including where to get the "sparse" utility.
 112
 113 ifeq ("$(origin C)", "command line")
 114   KBUILD_CHECKSRC = $(C)
 115 endif
 116 ifndef KBUILD_CHECKSRC
 117   KBUILD_CHECKSRC = 0
 118 endif
 119
 120 export KBUILD_CHECKSRC
 121
 122 # Enable "clippy" (a linter) as part of the Rust compilation.
 123 #
 124 # Use 'make CLIPPY=1' to enable it.
 125 ifeq ("$(origin CLIPPY)", "command line")
 126   KBUILD_CLIPPY := $(CLIPPY)
 127 endif
 128
 129 export KBUILD_CLIPPY
 130
 131 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 132 # directory of external module to build. Setting M= takes precedence.
 133 ifeq ("$(origin M)", "command line")
 134   KBUILD_EXTMOD := $(M)
 135 endif
 136
 137 ifeq ("$(origin MO)", "command line")
 138   KBUILD_EXTMOD_OUTPUT := $(MO)
 139 endif
 140
 141 $(if $(word 2, $(KBUILD_EXTMOD)), \
 142         $(error building multiple external modules is not supported))
 143
 144 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
 145         $(error module directory path cannot contain '$x')))
 146
 147 # Remove trailing slashes
 148 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 149 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 150 endif
 151
 152 export KBUILD_EXTMOD
 153
 154 # backward compatibility
 155 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
 156
 157 ifeq ("$(origin W)", "command line")
 158   KBUILD_EXTRA_WARN := $(W)
 159 endif
 160
 161 export KBUILD_EXTRA_WARN
 162
 163 # Kbuild will save output files in the current working directory.
 164 # This does not need to match to the root of the kernel source tree.
 165 #
 166 # For example, you can do this:
 167 #
 168 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 169 #
 170 # If you want to save output files in a different location, there are
 171 # two syntaxes to specify it.
 172 #
 173 # 1) O=
 174 # Use "make O=dir/to/store/output/files/"
 175 #
 176 # 2) Set KBUILD_OUTPUT
 177 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 178 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 179 #
 180 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 181 # variable.
 182
 183 ifeq ("$(origin O)", "command line")
 184   KBUILD_OUTPUT := $(O)
 185 endif
 186
 187 ifdef KBUILD_EXTMOD
 188     ifdef KBUILD_OUTPUT
 189         objtree := $(realpath $(KBUILD_OUTPUT))
 190         $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist))
 191     else
 192         objtree := $(abs_srctree)
 193     endif
 194     # If Make is invoked from the kernel directory (either kernel
 195     # source directory or kernel build directory), external modules
 196     # are built in $(KBUILD_EXTMOD) for backward compatibility,
 197     # otherwise, built in the current directory.
 198     output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD)))
 199     # KBUILD_EXTMOD might be a relative path. Remember its absolute path before
 200     # Make changes the working directory.
 201     srcroot := $(realpath $(KBUILD_EXTMOD))
 202     $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist))
 203 else
 204     objtree := .
 205     output := $(KBUILD_OUTPUT)
 206 endif
 207
 208 export objtree srcroot
 209
 210 # Do we want to change the working directory?
 211 ifneq ($(output),)
 212 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
 213 $(shell mkdir -p "$(output)")
 214 # $(realpath ...) resolves symlinks
 215 abs_output := $(realpath $(output))
 216 $(if $(abs_output),,$(error failed to create output directory "$(output)"))
 217 endif
 218
 219 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 220 $(error source directory cannot contain spaces or colons)
 221 endif
 222
 223 export sub_make_done := 1
 224
 225 endif # sub_make_done
 226
 227 ifeq ($(abs_output),$(CURDIR))
 228 # Suppress "Entering directory ..." if we are at the final work directory.
 229 no-print-directory := --no-print-directory
 230 else
 231 # Recursion to show "Entering directory ..."
 232 need-sub-make := 1
 233 endif
 234
 235 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
 236 # If --no-print-directory is unset, recurse once again to set it.
 237 # You may end up recursing into __sub-make twice. This is needed due to the
 238 # behavior change in GNU Make 4.4.1.
 239 need-sub-make := 1
 240 endif
 241
 242 ifeq ($(need-sub-make),1)
 243
 244 PHONY += $(MAKECMDGOALS) __sub-make
 245
 246 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 247         @:
 248
 249 # Invoke a second make in the output directory, passing relevant variables
 250 __sub-make:
 251         $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \
 252         -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 253
 254 else # need-sub-make
 255
 256 # We process the rest of the Makefile if this is the final invocation of make
 257
 258 ifndef KBUILD_EXTMOD
 259 srcroot := $(abs_srctree)
 260 endif
 261
 262 ifeq ($(srcroot),$(CURDIR))
 263 building_out_of_srctree :=
 264 else
 265 export building_out_of_srctree := 1
 266 endif
 267
 268 ifdef KBUILD_ABS_SRCTREE
 269     # Do nothing. Use the absolute path.
 270 else ifeq ($(srcroot),$(CURDIR))
 271     # Building in the source.
 272     srcroot := .
 273 else ifeq ($(srcroot)/,$(dir $(CURDIR)))
 274     # Building in a subdirectory of the source.
 275     srcroot := ..
 276 endif
 277
 278 export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot))
 279
 280 ifdef building_out_of_srctree
 281 export VPATH := $(srcroot)
 282 else
 283 VPATH :=
 284 endif
 285
 286 # To make sure we do not include .config for any of the *config targets
 287 # catch them early, and hand them over to scripts/kconfig/Makefile
 288 # It is allowed to specify more targets when calling make, including
 289 # mixing *config targets and build targets.
 290 # For example 'make oldconfig all'.
 291 # Detect when mixed targets is specified, and make a second invocation
 292 # of make so .config is not included in this case either (for *config).
 293
 294 version_h := include/generated/uapi/linux/version.h
 295
 296 clean-targets := %clean mrproper cleandocs
 297 no-dot-config-targets := $(clean-targets) \
 298                          cscope gtags TAGS tags help% %docs check% coccicheck \
 299                          $(version_h) headers headers_% archheaders archscripts \
 300                          %asm-generic kernelversion %src-pkg dt_binding_check \
 301                          outputmakefile rustavailable rustfmt rustfmtcheck
 302 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
 303                           image_name
 304 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/
 305
 306 config-build    :=
 307 mixed-build     :=
 308 need-config     := 1
 309 may-sync-config := 1
 310 single-build    :=
 311
 312 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 313     ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 314         need-config :=
 315     endif
 316 endif
 317
 318 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 319     ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 320         may-sync-config :=
 321     endif
 322 endif
 323
 324 need-compiler := $(may-sync-config)
 325
 326 ifneq ($(KBUILD_EXTMOD),)
 327     may-sync-config :=
 328 endif
 329
 330 ifeq ($(KBUILD_EXTMOD),)
 331     ifneq ($(filter %config,$(MAKECMDGOALS)),)
 332         config-build := 1
 333         ifneq ($(words $(MAKECMDGOALS)),1)
 334             mixed-build := 1
 335         endif
 336     endif
 337 endif
 338
 339 # We cannot build single targets and the others at the same time
 340 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 341     single-build := 1
 342     ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 343         mixed-build := 1
 344     endif
 345 endif
 346
 347 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 348 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 349     ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 350         mixed-build := 1
 351     endif
 352 endif
 353
 354 # install and modules_install need also be processed one by one
 355 ifneq ($(filter install,$(MAKECMDGOALS)),)
 356     ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 357         mixed-build := 1
 358     endif
 359 endif
 360
 361 ifdef mixed-build
 362 # ===========================================================================
 363 # We're called with mixed targets (*config and build targets).
 364 # Handle them one by one.
 365
 366 PHONY += $(MAKECMDGOALS) __build_one_by_one
 367
 368 $(MAKECMDGOALS): __build_one_by_one
 369         @:
 370
 371 __build_one_by_one:
 372         $(Q)set -e; \
 373         for i in $(MAKECMDGOALS); do \
 374                 $(MAKE) -f $(srctree)/Makefile $$i; \
 375         done
 376
 377 else # !mixed-build
 378
 379 include $(srctree)/scripts/Kbuild.include
 380
 381 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 382 KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release)
 383 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 384 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 385
 386 include $(srctree)/scripts/subarch.include
 387
 388 # Cross compiling and selecting different set of gcc/bin-utils
 389 # ---------------------------------------------------------------------------
 390 #
 391 # When performing cross compilation for other architectures ARCH shall be set
 392 # to the target architecture. (See arch/* for the possibilities).
 393 # ARCH can be set during invocation of make:
 394 # make ARCH=arm64
 395 # Another way is to have ARCH set in the environment.
 396 # The default ARCH is the host where make is executed.
 397
 398 # CROSS_COMPILE specify the prefix used for all executables used
 399 # during compilation. Only gcc and related bin-utils executables
 400 # are prefixed with $(CROSS_COMPILE).
 401 # CROSS_COMPILE can be set on the command line
 402 # make CROSS_COMPILE=aarch64-linux-gnu-
 403 # Alternatively CROSS_COMPILE can be set in the environment.
 404 # Default value for CROSS_COMPILE is not to prefix executables
 405 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 406 ARCH            ?= $(SUBARCH)
 407
 408 # Architecture as present in compile.h
 409 UTS_MACHINE     := $(ARCH)
 410 SRCARCH         := $(ARCH)
 411
 412 # Additional ARCH settings for x86
 413 ifeq ($(ARCH),i386)
 414         SRCARCH := x86
 415 endif
 416 ifeq ($(ARCH),x86_64)
 417         SRCARCH := x86
 418 endif
 419
 420 # Additional ARCH settings for sparc
 421 ifeq ($(ARCH),sparc32)
 422        SRCARCH := sparc
 423 endif
 424 ifeq ($(ARCH),sparc64)
 425        SRCARCH := sparc
 426 endif
 427
 428 # Additional ARCH settings for parisc
 429 ifeq ($(ARCH),parisc64)
 430        SRCARCH := parisc
 431 endif
 432
 433 export cross_compiling :=
 434 ifneq ($(SRCARCH),$(SUBARCH))
 435 cross_compiling := 1
 436 endif
 437
 438 KCONFIG_CONFIG  ?= .config
 439 export KCONFIG_CONFIG
 440
 441 # SHELL used by kbuild
 442 CONFIG_SHELL := sh
 443
 444 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 445 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 446 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 447
 448 ifneq ($(LLVM),)
 449 ifneq ($(filter %/,$(LLVM)),)
 450 LLVM_PREFIX := $(LLVM)
 451 else ifneq ($(filter -%,$(LLVM)),)
 452 LLVM_SUFFIX := $(LLVM)
 453 endif
 454
 455 HOSTCC  = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 456 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 457 else
 458 HOSTCC  = gcc
 459 HOSTCXX = g++
 460 endif
 461 HOSTRUSTC = rustc
 462 HOSTPKG_CONFIG  = pkg-config
 463
 464 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 465                          -O2 -fomit-frame-pointer -std=gnu11
 466 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 467 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 468
 469 # These flags apply to all Rust code in the tree, including the kernel and
 470 # host programs.
 471 export rust_common_flags := --edition=2021 \
 472                             -Zbinary_dep_depinfo=y \
 473                             -Astable_features \
 474                             -Dnon_ascii_idents \
 475                             -Dunsafe_op_in_unsafe_fn \
 476                             -Wmissing_docs \
 477                             -Wrust_2018_idioms \
 478                             -Wunreachable_pub \
 479                             -Wclippy::all \
 480                             -Wclippy::ignored_unit_patterns \
 481                             -Wclippy::mut_mut \
 482                             -Wclippy::needless_bitwise_bool \
 483                             -Wclippy::needless_continue \
 484                             -Aclippy::needless_lifetimes \
 485                             -Wclippy::no_mangle_with_rust_abi \
 486                             -Wclippy::undocumented_unsafe_blocks \
 487                             -Wclippy::unnecessary_safety_comment \
 488                             -Wclippy::unnecessary_safety_doc \
 489                             -Wrustdoc::missing_crate_level_docs \
 490                             -Wrustdoc::unescaped_backticks
 491
 492 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
 493                        $(HOSTCFLAGS) -I $(srctree)/scripts/include
 494 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
 495                        -I $(srctree)/scripts/include
 496 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 497                         -Zallow-features= $(HOSTRUSTFLAGS)
 498 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 499 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 500
 501 # Make variables (CC, etc...)
 502 CPP             = $(CC) -E
 503 ifneq ($(LLVM),)
 504 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 505 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 506 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 507 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 508 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 509 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 510 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 511 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 512 else
 513 CC              = $(CROSS_COMPILE)gcc
 514 LD              = $(CROSS_COMPILE)ld
 515 AR              = $(CROSS_COMPILE)ar
 516 NM              = $(CROSS_COMPILE)nm
 517 OBJCOPY         = $(CROSS_COMPILE)objcopy
 518 OBJDUMP         = $(CROSS_COMPILE)objdump
 519 READELF         = $(CROSS_COMPILE)readelf
 520 STRIP           = $(CROSS_COMPILE)strip
 521 endif
 522 RUSTC           = rustc
 523 RUSTDOC         = rustdoc
 524 RUSTFMT         = rustfmt
 525 CLIPPY_DRIVER   = clippy-driver
 526 BINDGEN         = bindgen
 527 PAHOLE          = pahole
 528 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 529 LEX             = flex
 530 YACC            = bison
 531 AWK             = awk
 532 INSTALLKERNEL  := installkernel
 533 PERL            = perl
 534 PYTHON3         = python3
 535 CHECK           = sparse
 536 BASH            = bash
 537 KGZIP           = gzip
 538 KBZIP2          = bzip2
 539 KLZOP           = lzop
 540 LZMA            = lzma
 541 LZ4             = lz4
 542 XZ              = xz
 543 ZSTD            = zstd
 544
 545 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 546                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 547 NOSTDINC_FLAGS :=
 548 CFLAGS_MODULE   =
 549 RUSTFLAGS_MODULE =
 550 AFLAGS_MODULE   =
 551 LDFLAGS_MODULE  =
 552 CFLAGS_KERNEL   =
 553 RUSTFLAGS_KERNEL =
 554 AFLAGS_KERNEL   =
 555 LDFLAGS_vmlinux =
 556
 557 # Use USERINCLUDE when you must reference the UAPI directories only.
 558 USERINCLUDE    := \
 559                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 560                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 561                 -I$(srctree)/include/uapi \
 562                 -I$(objtree)/include/generated/uapi \
 563                 -include $(srctree)/include/linux/compiler-version.h \
 564                 -include $(srctree)/include/linux/kconfig.h
 565
 566 # Use LINUXINCLUDE when you must reference the include/ directory.
 567 # Needed to be compatible with the O= option
 568 LINUXINCLUDE    := \
 569                 -I$(srctree)/arch/$(SRCARCH)/include \
 570                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 571                 -I$(srctree)/include \
 572                 -I$(objtree)/include \
 573                 $(USERINCLUDE)
 574
 575 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 576
 577 KBUILD_CFLAGS :=
 578 KBUILD_CFLAGS += -std=gnu11
 579 KBUILD_CFLAGS += -fshort-wchar
 580 KBUILD_CFLAGS += -funsigned-char
 581 KBUILD_CFLAGS += -fno-common
 582 KBUILD_CFLAGS += -fno-PIE
 583 KBUILD_CFLAGS += -fno-strict-aliasing
 584
 585 KBUILD_CPPFLAGS := -D__KERNEL__
 586 KBUILD_RUSTFLAGS := $(rust_common_flags) \
 587                     -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 588                     -Cforce-unwind-tables=n -Ccodegen-units=1 \
 589                     -Csymbol-mangling-version=v0 \
 590                     -Crelocation-model=static \
 591                     -Zfunction-sections=n \
 592                     -Wclippy::float_arithmetic
 593
 594 KBUILD_AFLAGS_KERNEL :=
 595 KBUILD_CFLAGS_KERNEL :=
 596 KBUILD_RUSTFLAGS_KERNEL :=
 597 KBUILD_AFLAGS_MODULE  := -DMODULE
 598 KBUILD_CFLAGS_MODULE  := -DMODULE
 599 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 600 KBUILD_LDFLAGS_MODULE :=
 601 KBUILD_LDFLAGS :=
 602 CLANG_FLAGS :=
 603
 604 ifeq ($(KBUILD_CLIPPY),1)
 605         RUSTC_OR_CLIPPY_QUIET := CLIPPY
 606         RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 607 else
 608         RUSTC_OR_CLIPPY_QUIET := RUSTC
 609         RUSTC_OR_CLIPPY = $(RUSTC)
 610 endif
 611
 612 # Allows the usage of unstable features in stable compilers.
 613 export RUSTC_BOOTSTRAP := 1
 614
 615 # Allows finding `.clippy.toml` in out-of-srctree builds.
 616 export CLIPPY_CONF_DIR := $(srctree)
 617
 618 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 619 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
 620 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 621 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 622 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 623 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 624 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 625 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 626
 627 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 628 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 629 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 630 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 631 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 632 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 633
 634 # Files to ignore in find ... statements
 635
 636 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 637                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 638                           -prune -o
 639
 640 # ===========================================================================
 641 # Rules shared between *config targets and build targets
 642
 643 # Basic helpers built in scripts/basic/
 644 PHONY += scripts_basic
 645 scripts_basic:
 646         $(Q)$(MAKE) $(build)=scripts/basic
 647
 648 PHONY += outputmakefile
 649 ifdef building_out_of_srctree
 650 # Before starting out-of-tree build, make sure the source tree is clean.
 651 # outputmakefile generates a Makefile in the output directory, if using a
 652 # separate output directory. This allows convenient use of make in the
 653 # output directory.
 654 # At the same time when output Makefile generated, generate .gitignore to
 655 # ignore whole output directory
 656
 657 ifdef KBUILD_EXTMOD
 658 print_env_for_makefile = \
 659         echo "export KBUILD_OUTPUT = $(objtree)"; \
 660         echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \
 661         echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)"
 662 else
 663 print_env_for_makefile = \
 664         echo "export KBUILD_OUTPUT = $(CURDIR)"
 665 endif
 666
 667 quiet_cmd_makefile = GEN     Makefile
 668       cmd_makefile = { \
 669         echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \
 670         $(print_env_for_makefile); \
 671         echo "include $(abs_srctree)/Makefile"; \
 672         } > Makefile
 673
 674 outputmakefile:
 675 ifeq ($(KBUILD_EXTMOD),)
 676         @if [ -f $(srctree)/.config -o \
 677                  -d $(srctree)/include/config -o \
 678                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 679                 echo >&2 "***"; \
 680                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 681                 echo >&2 "*** in $(abs_srctree)";\
 682                 echo >&2 "***"; \
 683                 false; \
 684         fi
 685 else
 686         @if [ -f $(srcroot)/modules.order ]; then \
 687                 echo >&2 "***"; \
 688                 echo >&2 "*** The external module source tree is not clean."; \
 689                 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \
 690                 echo >&2 "***"; \
 691                 false; \
 692         fi
 693 endif
 694         $(Q)ln -fsn $(srcroot) source
 695         $(call cmd,makefile)
 696         $(Q)test -e .gitignore || \
 697         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 698 endif
 699
 700 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 701 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 702 # CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they
 703 # need export), and from include/config/auto.conf.cmd to detect the compiler
 704 # upgrade.
 705 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 706 RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null))
 707
 708 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 709 include $(srctree)/scripts/Makefile.clang
 710 endif
 711
 712 # Include this also for config targets because some architectures need
 713 # cc-cross-prefix to determine CROSS_COMPILE.
 714 ifdef need-compiler
 715 include $(srctree)/scripts/Makefile.compiler
 716 endif
 717
 718 ifdef config-build
 719 # ===========================================================================
 720 # *config targets only - make sure prerequisites are updated, and descend
 721 # in scripts/kconfig to make the *config target
 722
 723 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
 724 # KBUILD_DEFCONFIG may point out an alternative default configuration
 725 # used for 'make defconfig'
 726 include $(srctree)/arch/$(SRCARCH)/Makefile
 727 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT
 728
 729 config: outputmakefile scripts_basic FORCE
 730         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 731
 732 %config: outputmakefile scripts_basic FORCE
 733         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 734
 735 else #!config-build
 736 # ===========================================================================
 737 # Build targets only - this includes vmlinux, arch-specific targets, clean
 738 # targets and others. In general all targets except *config targets.
 739
 740 # If building an external module we do not care about the all: rule
 741 # but instead __all depend on modules
 742 PHONY += all
 743 ifeq ($(KBUILD_EXTMOD),)
 744 __all: all
 745 else
 746 __all: modules
 747 endif
 748
 749 targets :=
 750
 751 # Decide whether to build built-in, modular, or both.
 752 # Normally, just do built-in.
 753
 754 KBUILD_MODULES :=
 755 KBUILD_BUILTIN := 1
 756
 757 # If we have only "make modules", don't compile built-in objects.
 758 ifeq ($(MAKECMDGOALS),modules)
 759   KBUILD_BUILTIN :=
 760 endif
 761
 762 # If we have "make <whatever> modules", compile modules
 763 # in addition to whatever we do anyway.
 764 # Just "make" or "make all" shall build modules as well
 765
 766 ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),)
 767   KBUILD_MODULES := 1
 768 endif
 769
 770 ifeq ($(MAKECMDGOALS),)
 771   KBUILD_MODULES := 1
 772 endif
 773
 774 export KBUILD_MODULES KBUILD_BUILTIN
 775
 776 ifdef need-config
 777 include $(objtree)/include/config/auto.conf
 778 endif
 779
 780 ifeq ($(KBUILD_EXTMOD),)
 781 # Objects we will link into vmlinux / subdirs we need to visit
 782 core-y          :=
 783 drivers-y       :=
 784 libs-y          := lib/
 785 endif # KBUILD_EXTMOD
 786
 787 # The all: target is the default when no target is given on the
 788 # command line.
 789 # This allow a user to issue only 'make' to build a kernel including modules
 790 # Defaults to vmlinux, but the arch makefile usually adds further targets
 791 all: vmlinux
 792
 793 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 794 ifdef CONFIG_CC_IS_GCC
 795 CFLAGS_GCOV     += -fno-tree-loop-im
 796 endif
 797 export CFLAGS_GCOV
 798
 799 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 800 ifdef CONFIG_FUNCTION_TRACER
 801   CC_FLAGS_FTRACE := -pg
 802 endif
 803
 804 include $(srctree)/arch/$(SRCARCH)/Makefile
 805
 806 ifdef need-config
 807 ifdef may-sync-config
 808 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 809 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 810 # because some architectures define CROSS_COMPILE there.
 811 include include/config/auto.conf.cmd
 812
 813 $(KCONFIG_CONFIG):
 814         @echo >&2 '***'
 815         @echo >&2 '*** Configuration file "$@" not found!'
 816         @echo >&2 '***'
 817         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 818         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 819         @echo >&2 '***'
 820         @/bin/false
 821
 822 # The actual configuration files used during the build are stored in
 823 # include/generated/ and include/config/. Update them if .config is newer than
 824 # include/config/auto.conf (which mirrors .config).
 825 #
 826 # This exploits the 'multi-target pattern rule' trick.
 827 # The syncconfig should be executed only once to make all the targets.
 828 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 829 #
 830 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 831 # so you cannot notice that Kconfig is waiting for the user input.
 832 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 833         $(Q)$(kecho) "  SYNC    $@"
 834         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 835 else # !may-sync-config
 836 # External modules and some install targets need include/generated/autoconf.h
 837 # and include/config/auto.conf but do not care if they are up-to-date.
 838 # Use auto.conf to show the error message
 839
 840 checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf)
 841 missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs))
 842
 843 ifdef missing-configs
 844 PHONY += $(objtree)/include/config/auto.conf
 845
 846 $(objtree)/include/config/auto.conf:
 847         @echo   >&2 '***'
 848         @echo   >&2 '***  ERROR: Kernel configuration is invalid. The following files are missing:'
 849         @printf >&2 '***    - %s\n' $(missing-configs)
 850         @echo   >&2 '***  Run "make oldconfig && make prepare" on kernel source to fix it.'
 851         @echo   >&2 '***'
 852         @/bin/false
 853 endif
 854
 855 endif # may-sync-config
 856 endif # need-config
 857
 858 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 859
 860 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 861 KBUILD_CFLAGS += -O2
 862 KBUILD_RUSTFLAGS += -Copt-level=2
 863 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 864 KBUILD_CFLAGS += -Os
 865 KBUILD_RUSTFLAGS += -Copt-level=s
 866 endif
 867
 868 # Always set `debug-assertions` and `overflow-checks` because their default
 869 # depends on `opt-level` and `debug-assertions`, respectively.
 870 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 871 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 872
 873 # Tell gcc to never replace conditional load with a non-conditional one
 874 ifdef CONFIG_CC_IS_GCC
 875 # gcc-10 renamed --param=allow-store-data-races=0 to
 876 # -fno-allow-store-data-races.
 877 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 878 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 879 endif
 880
 881 ifdef CONFIG_READABLE_ASM
 882 # Disable optimizations that make assembler listings hard to read.
 883 # reorder blocks reorders the control in the function
 884 # ipa clone creates specialized cloned functions
 885 # partial inlining inlines only parts of functions
 886 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 887 endif
 888
 889 stackp-flags-y                                    := -fno-stack-protector
 890 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 891 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 892
 893 KBUILD_CFLAGS += $(stackp-flags-y)
 894
 895 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 896 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 897
 898 ifdef CONFIG_FRAME_POINTER
 899 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 900 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 901 else
 902 # Some targets (ARM with Thumb2, for example), can't be built with frame
 903 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 904 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 905 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 906 # -fomit-frame-pointer with FUNCTION_TRACER.
 907 # In the Rust target specification, "frame-pointer" is set explicitly
 908 # to "may-omit".
 909 ifndef CONFIG_FUNCTION_TRACER
 910 KBUILD_CFLAGS   += -fomit-frame-pointer
 911 endif
 912 endif
 913
 914 # Initialize all stack variables with a 0xAA pattern.
 915 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 916 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 917 endif
 918
 919 # Initialize all stack variables with a zero value.
 920 ifdef CONFIG_INIT_STACK_ALL_ZERO
 921 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 922 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 923 # https://github.com/llvm/llvm-project/issues/44842
 924 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 925 export CC_AUTO_VAR_INIT_ZERO_ENABLER
 926 KBUILD_CFLAGS   += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
 927 endif
 928 endif
 929
 930 # While VLAs have been removed, GCC produces unreachable stack probes
 931 # for the randomize_kstack_offset feature. Disable it for all compilers.
 932 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 933
 934 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 935 ifdef CONFIG_ZERO_CALL_USED_REGS
 936 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 937 endif
 938
 939 ifdef CONFIG_FUNCTION_TRACER
 940 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 941   CC_FLAGS_FTRACE       += -mrecord-mcount
 942   ifdef CONFIG_HAVE_NOP_MCOUNT
 943     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 944       CC_FLAGS_FTRACE   += -mnop-mcount
 945       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 946     endif
 947   endif
 948 endif
 949 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 950   ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
 951     CC_FLAGS_USING      += -DCC_USING_NOP_MCOUNT
 952   endif
 953 endif
 954 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 955   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 956     BUILD_C_RECORDMCOUNT := y
 957     export BUILD_C_RECORDMCOUNT
 958   endif
 959 endif
 960 ifdef CONFIG_HAVE_FENTRY
 961   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 962   ifeq ($(call cc-option-yn, -mfentry),y)
 963     CC_FLAGS_FTRACE     += -mfentry
 964     CC_FLAGS_USING      += -DCC_USING_FENTRY
 965   endif
 966 endif
 967 export CC_FLAGS_FTRACE
 968 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 969 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 970 endif
 971
 972 # We trigger additional mismatches with less inlining
 973 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 974 KBUILD_CFLAGS += -fno-inline-functions-called-once
 975 endif
 976
 977 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 978 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 979 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 980 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 981 LDFLAGS_vmlinux += --gc-sections
 982 endif
 983
 984 ifdef CONFIG_SHADOW_CALL_STACK
 985 ifndef CONFIG_DYNAMIC_SCS
 986 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 987 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 988 KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack
 989 endif
 990 export CC_FLAGS_SCS
 991 endif
 992
 993 ifdef CONFIG_LTO_CLANG
 994 ifdef CONFIG_LTO_CLANG_THIN
 995 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 996 else
 997 CC_FLAGS_LTO    := -flto
 998 endif
 999 CC_FLAGS_LTO    += -fvisibility=hidden
1000
1001 # Limit inlining across translation units to reduce binary size
1002 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
1003 endif
1004
1005 ifdef CONFIG_LTO
1006 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
1007 KBUILD_AFLAGS   += -fno-lto
1008 export CC_FLAGS_LTO
1009 endif
1010
1011 ifdef CONFIG_CFI_CLANG
1012 CC_FLAGS_CFI    := -fsanitize=kcfi
1013 ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS
1014         CC_FLAGS_CFI    += -fsanitize-cfi-icall-experimental-normalize-integers
1015 endif
1016 ifdef CONFIG_RUST
1017         # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects
1018         # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS.
1019         RUSTC_FLAGS_CFI   := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers
1020         KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI)
1021         export RUSTC_FLAGS_CFI
1022 endif
1023 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
1024 export CC_FLAGS_CFI
1025 endif
1026
1027 # Architectures can define flags to add/remove for floating-point support
1028 CC_FLAGS_FPU    += -D_LINUX_FPU_COMPILATION_UNIT
1029 export CC_FLAGS_FPU
1030 export CC_FLAGS_NO_FPU
1031
1032 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1033 # Set the minimal function alignment. Use the newer GCC option
1034 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
1035 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
1036 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
1037 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
1038 else
1039 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1040 endif
1041 endif
1042
1043 # arch Makefile may override CC so keep this after arch Makefile is included
1044 NOSTDINC_FLAGS += -nostdinc
1045
1046 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
1047 # the kernel uses only C99 flexible arrays for dynamically sized trailing
1048 # arrays. Enforce this for everything that may examine structure sizes and
1049 # perform bounds checking.
1050 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
1051
1052 #Currently, disable -Wstringop-overflow for GCC 11, globally.
1053 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
1054 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
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 # change __FILE__ to the relative path to the source directory
1068 ifdef building_out_of_srctree
1069 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
1070 endif
1071
1072 # include additional Makefiles when needed
1073 include-y                       := scripts/Makefile.extrawarn
1074 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1075 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1076 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1077 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1078 include-$(CONFIG_KMSAN)         += scripts/Makefile.kmsan
1079 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1080 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1081 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1082 include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo
1083 include-$(CONFIG_PROPELLER_CLANG)       += scripts/Makefile.propeller
1084 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1085
1086 include $(addprefix $(srctree)/, $(include-y))
1087
1088 # scripts/Makefile.gcc-plugins is intentionally included last.
1089 # Do not add $(call cc-option,...) below this line. When you build the kernel
1090 # from the clean source tree, the GCC plugins do not exist at this point.
1091
1092 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1093 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1094 KBUILD_AFLAGS   += $(KAFLAGS)
1095 KBUILD_CFLAGS   += $(KCFLAGS)
1096 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1097
1098 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1099 LDFLAGS_vmlinux += --build-id=sha1
1100
1101 KBUILD_LDFLAGS  += -z noexecstack
1102 ifeq ($(CONFIG_LD_IS_BFD),y)
1103 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
1104 endif
1105
1106 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1107 LDFLAGS_vmlinux += -X
1108 endif
1109
1110 ifeq ($(CONFIG_RELR),y)
1111 # ld.lld before 15 did not support -z pack-relative-relocs.
1112 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1113 endif
1114
1115 # We never want expected sections to be placed heuristically by the
1116 # linker. All sections should be explicitly named in the linker script.
1117 ifdef CONFIG_LD_ORPHAN_WARN
1118 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1119 endif
1120
1121 # Align the bit size of userspace programs with the kernel
1122 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1123 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1124
1125 # make the checker run with the right architecture
1126 CHECKFLAGS += --arch=$(ARCH)
1127
1128 # insure the checker run with the right endianness
1129 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1130
1131 # the checker needs the correct machine size
1132 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1133
1134 # Default kernel image to build when no specific target is given.
1135 # KBUILD_IMAGE may be overruled on the command line or
1136 # set in the environment
1137 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1138 # this default value
1139 export KBUILD_IMAGE ?= vmlinux
1140
1141 #
1142 # INSTALL_PATH specifies where to place the updated kernel and system map
1143 # images. Default is /boot, but you can set it to other values
1144 export  INSTALL_PATH ?= /boot
1145
1146 #
1147 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1148 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1149 # an argument if needed. Otherwise it defaults to the kernel install path
1150 #
1151 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1152
1153 #
1154 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1155 # relocations required by build roots.  This is not defined in the
1156 # makefile but the argument can be passed to make if needed.
1157 #
1158
1159 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1160 export MODLIB
1161
1162 PHONY += prepare0
1163
1164 ifeq ($(KBUILD_EXTMOD),)
1165
1166 build-dir       := .
1167 clean-dirs      := $(sort . Documentation \
1168                      $(patsubst %/,%,$(filter %/, $(core-) \
1169                         $(drivers-) $(libs-))))
1170
1171 export ARCH_CORE        := $(core-y)
1172 export ARCH_LIB         := $(filter %/, $(libs-y))
1173 export ARCH_DRIVERS     := $(drivers-y) $(drivers-m)
1174 # Externally visible symbols (used by link-vmlinux.sh)
1175
1176 KBUILD_VMLINUX_OBJS := ./built-in.a
1177 ifdef CONFIG_MODULES
1178 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1179 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1180 else
1181 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1182 endif
1183
1184 export KBUILD_VMLINUX_LIBS
1185 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1186
1187 ifdef CONFIG_TRIM_UNUSED_KSYMS
1188 # For the kernel to actually contain only the needed exported symbols,
1189 # we have to build modules as well to determine what those symbols are.
1190 KBUILD_MODULES := 1
1191 endif
1192
1193 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1194 quiet_cmd_ar_vmlinux.a = AR      $@
1195       cmd_ar_vmlinux.a = \
1196         rm -f $@; \
1197         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1198         $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1199
1200 targets += vmlinux.a
1201 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1202         $(call if_changed,ar_vmlinux.a)
1203
1204 PHONY += vmlinux_o
1205 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1206         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1207
1208 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1209         @:
1210
1211 PHONY += vmlinux
1212 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1213 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1214 # unrelated; the decompressors just happen to have the same base name,
1215 # arch/*/boot/compressed/vmlinux.
1216 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1217 #
1218 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1219 #   https://savannah.gnu.org/bugs/?61463
1220 # For Make > 4.4, the following simple code will work:
1221 #  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1222 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1223 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1224 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1225         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1226
1227 # The actual objects are generated when descending,
1228 # make sure no implicit rule kicks in
1229 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1230
1231 ifeq ($(origin KERNELRELEASE),file)
1232 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1233 else
1234 filechk_kernel.release = echo $(KERNELRELEASE)
1235 endif
1236
1237 # Store (new) KERNELRELEASE string in include/config/kernel.release
1238 include/config/kernel.release: FORCE
1239         $(call filechk,kernel.release)
1240
1241 # Additional helpers built in scripts/
1242 # Carefully list dependencies so we do not try to build scripts twice
1243 # in parallel
1244 PHONY += scripts
1245 scripts: scripts_basic scripts_dtc
1246         $(Q)$(MAKE) $(build)=$(@)
1247
1248 # Things we need to do before we recursively start building the kernel
1249 # or the modules are listed in "prepare".
1250 # A multi level approach is used. prepareN is processed before prepareN-1.
1251 # archprepare is used in arch Makefiles and when processed asm symlink,
1252 # version.h and scripts_basic is processed / created.
1253
1254 PHONY += prepare archprepare
1255
1256 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1257         asm-generic $(version_h) include/generated/utsrelease.h \
1258         include/generated/compile.h include/generated/autoconf.h \
1259         include/generated/rustc_cfg remove-stale-files
1260
1261 prepare0: archprepare
1262         $(Q)$(MAKE) $(build)=scripts/mod
1263         $(Q)$(MAKE) $(build)=. prepare
1264
1265 # All the preparing..
1266 prepare: prepare0
1267 ifdef CONFIG_RUST
1268         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1269         $(Q)$(MAKE) $(build)=rust
1270 endif
1271
1272 PHONY += remove-stale-files
1273 remove-stale-files:
1274         $(Q)$(srctree)/scripts/remove-stale-files
1275
1276 # Support for using generic headers in asm-generic
1277 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1278
1279 PHONY += asm-generic uapi-asm-generic
1280 asm-generic: uapi-asm-generic
1281         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1282         generic=include/asm-generic
1283 uapi-asm-generic:
1284         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1285         generic=include/uapi/asm-generic
1286
1287 # Generate some files
1288 # ---------------------------------------------------------------------------
1289
1290 # KERNELRELEASE can change from a few different places, meaning version.h
1291 # needs to be updated, so this check is forced on all builds
1292
1293 uts_len := 64
1294 define filechk_utsrelease.h
1295         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1296           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1297           exit 1;                                                         \
1298         fi;                                                               \
1299         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1300 endef
1301
1302 define filechk_version.h
1303         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1304                 echo \#define LINUX_VERSION_CODE $(shell                 \
1305                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1306         else                                                             \
1307                 echo \#define LINUX_VERSION_CODE $(shell                 \
1308                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1309         fi;                                                              \
1310         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1311         ((c) > 255 ? 255 : (c)))';                                       \
1312         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1313         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1314         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1315 endef
1316
1317 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1318 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1319 $(version_h): FORCE
1320         $(call filechk,version.h)
1321
1322 include/generated/utsrelease.h: include/config/kernel.release FORCE
1323         $(call filechk,utsrelease.h)
1324
1325 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1326         "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1327
1328 include/generated/compile.h: FORCE
1329         $(call filechk,compile.h)
1330
1331 PHONY += headerdep
1332 headerdep:
1333         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1334         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1335
1336 # ---------------------------------------------------------------------------
1337 # Kernel headers
1338
1339 #Default location for installed headers
1340 export INSTALL_HDR_PATH = $(objtree)/usr
1341
1342 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1343       cmd_headers_install = \
1344         mkdir -p $(INSTALL_HDR_PATH); \
1345         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1346         usr/include $(INSTALL_HDR_PATH)
1347
1348 PHONY += headers_install
1349 headers_install: headers
1350         $(call cmd,headers_install)
1351
1352 PHONY += archheaders archscripts
1353
1354 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1355
1356 PHONY += headers
1357 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1358         $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1359         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1360         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1361
1362 ifdef CONFIG_HEADERS_INSTALL
1363 prepare: headers
1364 endif
1365
1366 PHONY += scripts_unifdef
1367 scripts_unifdef: scripts_basic
1368         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1369
1370 # ---------------------------------------------------------------------------
1371 # Install
1372
1373 # Many distributions have the custom install script, /sbin/installkernel.
1374 # If DKMS is installed, 'make install' will eventually recurse back
1375 # to this Makefile to build and install external modules.
1376 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1377
1378 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1379       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1380
1381 # ---------------------------------------------------------------------------
1382 # vDSO install
1383
1384 PHONY += vdso_install
1385 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1386 vdso_install:
1387         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1388
1389 # ---------------------------------------------------------------------------
1390 # Tools
1391
1392 ifdef CONFIG_OBJTOOL
1393 prepare: tools/objtool
1394 endif
1395
1396 ifdef CONFIG_BPF
1397 ifdef CONFIG_DEBUG_INFO_BTF
1398 prepare: tools/bpf/resolve_btfids
1399 endif
1400 endif
1401
1402 # The tools build system is not a part of Kbuild and tends to introduce
1403 # its own unique issues. If you need to integrate a new tool into Kbuild,
1404 # please consider locating that tool outside the tools/ tree and using the
1405 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1406 # here. See Documentation/kbuild/makefiles.rst for details.
1407
1408 PHONY += resolve_btfids_clean
1409
1410 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1411
1412 # tools/bpf/resolve_btfids directory might not exist
1413 # in output directory, skip its clean in that case
1414 resolve_btfids_clean:
1415 ifneq ($(wildcard $(resolve_btfids_O)),)
1416         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1417 endif
1418
1419 # Clear a bunch of variables before executing the submake
1420 ifeq ($(quiet),silent_)
1421 tools_silent=s
1422 endif
1423
1424 tools/: FORCE
1425         $(Q)mkdir -p $(objtree)/tools
1426         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1427
1428 tools/%: FORCE
1429         $(Q)mkdir -p $(objtree)/tools
1430         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1431
1432 # ---------------------------------------------------------------------------
1433 # Kernel selftest
1434
1435 PHONY += kselftest
1436 kselftest: headers
1437         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1438
1439 kselftest-%: headers FORCE
1440         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1441
1442 PHONY += kselftest-merge
1443 kselftest-merge:
1444         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1445         $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1446                 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1447         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1448
1449 # ---------------------------------------------------------------------------
1450 # Devicetree files
1451
1452 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1453 dtstree := arch/$(SRCARCH)/boot/dts
1454 endif
1455
1456 ifneq ($(dtstree),)
1457
1458 %.dtb: dtbs_prepare
1459         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1460
1461 %.dtbo: dtbs_prepare
1462         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1463
1464 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1465 dtbs: dtbs_prepare
1466         $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1467
1468 # include/config/kernel.release is actually needed when installing DTBs because
1469 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1470 # dtbs_install depend on it as dtbs_install may run as root.
1471 dtbs_prepare: include/config/kernel.release scripts_dtc
1472
1473 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1474 export CHECK_DTBS=y
1475 endif
1476
1477 ifneq ($(CHECK_DTBS),)
1478 dtbs_prepare: dt_binding_schemas
1479 endif
1480
1481 dtbs_check: dtbs
1482
1483 dtbs_install:
1484         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1485
1486 ifdef CONFIG_OF_EARLY_FLATTREE
1487 all: dtbs
1488 endif
1489
1490 ifdef CONFIG_GENERIC_BUILTIN_DTB
1491 vmlinux: dtbs
1492 endif
1493
1494 endif
1495
1496 PHONY += scripts_dtc
1497 scripts_dtc: scripts_basic
1498         $(Q)$(MAKE) $(build)=scripts/dtc
1499
1500 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1501 export CHECK_DTBS=y
1502 endif
1503
1504 PHONY += dt_binding_check dt_binding_schemas
1505 dt_binding_check: dt_binding_schemas scripts_dtc
1506         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1507
1508 dt_binding_schemas:
1509         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1510
1511 PHONY += dt_compatible_check
1512 dt_compatible_check: dt_binding_schemas
1513         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1514
1515 # ---------------------------------------------------------------------------
1516 # Modules
1517
1518 ifdef CONFIG_MODULES
1519
1520 # By default, build modules as well
1521
1522 all: modules
1523
1524 # When we're building modules with modversions, we need to consider
1525 # the built-in objects during the descend as well, in order to
1526 # make sure the checksums are up to date before we record them.
1527 ifdef CONFIG_MODVERSIONS
1528   KBUILD_BUILTIN := 1
1529 endif
1530
1531 # Build modules
1532 #
1533
1534 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1535 # is an exception.
1536 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1537 KBUILD_BUILTIN := 1
1538 modules: vmlinux
1539 endif
1540
1541 modules: modules_prepare
1542
1543 # Target to prepare building external modules
1544 modules_prepare: prepare
1545         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1546
1547 endif # CONFIG_MODULES
1548
1549 ###
1550 # Cleaning is done on three levels.
1551 # make clean     Delete most generated files
1552 #                Leave enough to build external modules
1553 # make mrproper  Delete the current configuration, and all generated files
1554 # make distclean Remove editor backup files, patch leftover files and the like
1555
1556 # Directories & files removed with 'make clean'
1557 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1558                modules.builtin modules.builtin.modinfo modules.nsdeps \
1559                modules.builtin.ranges vmlinux.o.map \
1560                compile_commands.json rust/test \
1561                rust-project.json .vmlinux.objs .vmlinux.export.c \
1562                .builtin-dtbs-list .builtin-dtb.S
1563
1564 # Directories & files removed with 'make mrproper'
1565 MRPROPER_FILES += include/config include/generated          \
1566                   arch/$(SRCARCH)/include/generated .objdiff \
1567                   debian snap tar-install PKGBUILD pacman \
1568                   .config .config.old .version \
1569                   Module.symvers \
1570                   certs/signing_key.pem \
1571                   certs/x509.genkey \
1572                   vmlinux-gdb.py \
1573                   rpmbuild \
1574                   rust/libmacros.so
1575
1576 # clean - Delete most, but leave enough to build external modules
1577 #
1578 clean: private rm-files := $(CLEAN_FILES)
1579
1580 PHONY += archclean vmlinuxclean
1581
1582 vmlinuxclean:
1583         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1584         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1585
1586 clean: archclean vmlinuxclean resolve_btfids_clean
1587
1588 # mrproper - Delete all generated files, including .config
1589 #
1590 mrproper: private rm-files := $(MRPROPER_FILES)
1591 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1592
1593 PHONY += $(mrproper-dirs) mrproper
1594 $(mrproper-dirs):
1595         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1596
1597 mrproper: clean $(mrproper-dirs)
1598         $(call cmd,rmfiles)
1599         @find . $(RCS_FIND_IGNORE) \
1600                 \( -name '*.rmeta' \) \
1601                 -type f -print | xargs rm -f
1602
1603 # distclean
1604 #
1605 PHONY += distclean
1606
1607 distclean: mrproper
1608         @find . $(RCS_FIND_IGNORE) \
1609                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1610                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1611                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1612                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1613                 -type f -print | xargs rm -f
1614
1615
1616 # Packaging of the kernel to various formats
1617 # ---------------------------------------------------------------------------
1618
1619 %src-pkg: FORCE
1620         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1621 %pkg: include/config/kernel.release FORCE
1622         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1623
1624 # Brief documentation of the typical targets used
1625 # ---------------------------------------------------------------------------
1626
1627 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1628 boards := $(sort $(notdir $(boards)))
1629 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1630 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1631
1632 PHONY += help
1633 help:
1634         @echo  'Cleaning targets:'
1635         @echo  '  clean           - Remove most generated files but keep the config and'
1636         @echo  '                    enough build support to build external modules'
1637         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1638         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1639         @echo  ''
1640         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1641         @echo  ''
1642         @echo  'Other generic targets:'
1643         @echo  '  all             - Build all targets marked with [*]'
1644         @echo  '* vmlinux         - Build the bare kernel'
1645         @echo  '* modules         - Build all modules'
1646         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1647         @echo  '  vdso_install    - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1648         @echo  '  dir/            - Build all files in dir and below'
1649         @echo  '  dir/file.[ois]  - Build specified target only'
1650         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1651         @echo  '                    (requires compiler support for LLVM assembly generation)'
1652         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1653         @echo  '                    (requires a recent binutils and recent build (System.map))'
1654         @echo  '  dir/file.ko     - Build module including final link'
1655         @echo  '  modules_prepare - Set up for building external modules'
1656         @echo  '  tags/TAGS       - Generate tags file for editors'
1657         @echo  '  cscope          - Generate cscope index'
1658         @echo  '  gtags           - Generate GNU GLOBAL index'
1659         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1660         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1661         @echo  '  image_name      - Output the image name (use with make -s)'
1662         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1663          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1664          echo  ''
1665         @echo  'Static analysers:'
1666         @echo  '  checkstack      - Generate a list of stack hogs and consider all functions'
1667         @echo  '                    with a stack size larger than MINSTACKSIZE (default: 100)'
1668         @echo  '  versioncheck    - Sanity check on version.h usage'
1669         @echo  '  includecheck    - Check for duplicate included header files'
1670         @echo  '  headerdep       - Detect inclusion cycles in headers'
1671         @echo  '  coccicheck      - Check with Coccinelle'
1672         @echo  '  clang-analyzer  - Check with clang static analyzer'
1673         @echo  '  clang-tidy      - Check with clang-tidy'
1674         @echo  ''
1675         @echo  'Tools:'
1676         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1677         @echo  ''
1678         @echo  'Kernel selftest:'
1679         @echo  '  kselftest         - Build and run kernel selftest'
1680         @echo  '                      Build, install, and boot kernel before'
1681         @echo  '                      running kselftest on it'
1682         @echo  '                      Run as root for full coverage'
1683         @echo  '  kselftest-all     - Build kernel selftest'
1684         @echo  '  kselftest-install - Build and install kernel selftest'
1685         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1686         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1687         @echo  '                      kselftest to existing .config.'
1688         @echo  ''
1689         @echo  'Rust targets:'
1690         @echo  '  rustavailable   - Checks whether the Rust toolchain is'
1691         @echo  '                    available and, if not, explains why.'
1692         @echo  '  rustfmt         - Reformat all the Rust code in the kernel'
1693         @echo  '  rustfmtcheck    - Checks if all the Rust code in the kernel'
1694         @echo  '                    is formatted, printing a diff otherwise.'
1695         @echo  '  rustdoc         - Generate Rust documentation'
1696         @echo  '                    (requires kernel .config)'
1697         @echo  '  rusttest        - Runs the Rust tests'
1698         @echo  '                    (requires kernel .config; downloads external repos)'
1699         @echo  '  rust-analyzer   - Generate rust-project.json rust-analyzer support file'
1700         @echo  '                    (requires kernel .config)'
1701         @echo  '  dir/file.[os]   - Build specified target only'
1702         @echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1703         @echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1704         @echo  '                    The output is not intended to be compilable.'
1705         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1706         @echo  ''
1707         @$(if $(dtstree), \
1708                 echo 'Devicetree:'; \
1709                 echo '* dtbs               - Build device tree blobs for enabled boards'; \
1710                 echo '  dtbs_install       - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1711                 echo '  dt_binding_check   - Validate device tree binding documents and examples'; \
1712                 echo '  dt_binding_schemas - Build processed device tree binding schemas'; \
1713                 echo '  dtbs_check         - Validate device tree source files';\
1714                 echo '')
1715
1716         @echo 'Userspace tools targets:'
1717         @echo '  use "make tools/help"'
1718         @echo '  or  "cd tools; make help"'
1719         @echo  ''
1720         @echo  'Kernel packaging:'
1721         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1722         @echo  ''
1723         @echo  'Documentation targets:'
1724         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1725         @echo  ''
1726         @echo  'Architecture-specific targets ($(SRCARCH)):'
1727         @$(or $(archhelp),\
1728                 echo '  No architecture-specific help defined for $(SRCARCH)')
1729         @echo  ''
1730         @$(if $(boards), \
1731                 $(foreach b, $(boards), \
1732                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1733                 echo '')
1734         @$(if $(board-dirs), \
1735                 $(foreach b, $(board-dirs), \
1736                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1737                 printf "  %-16s - Show all of the above\\n" help-boards; \
1738                 echo '')
1739
1740         @echo  '  make V=n   [targets] 1: verbose build'
1741         @echo  '                       2: give reason for rebuild of target'
1742         @echo  '                       V=1 and V=2 can be combined with V=12'
1743         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1744         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1745         @echo  '                       (sparse by default)'
1746         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1747         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1748         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3,c,e where'
1749         @echo  '                1: warnings which may be relevant and do not occur too often'
1750         @echo  '                2: warnings which occur quite often but may still be relevant'
1751         @echo  '                3: more obscure warnings, can most likely be ignored'
1752         @echo  '                c: extra checks in the configuration stage (Kconfig)'
1753         @echo  '                e: warnings are being treated as errors'
1754         @echo  '                Multiple levels can be combined with W=12 or W=123'
1755         @$(if $(dtstree), \
1756                 echo '  make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1757                 echo '         This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1758                 )
1759         @echo  ''
1760         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1761         @echo  'For further info see the ./README file'
1762
1763
1764 help-board-dirs := $(addprefix help-,$(board-dirs))
1765
1766 help-boards: $(help-board-dirs)
1767
1768 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1769
1770 $(help-board-dirs): help-%:
1771         @echo  'Architecture-specific targets ($(SRCARCH) $*):'
1772         @$(if $(boards-per-dir), \
1773                 $(foreach b, $(boards-per-dir), \
1774                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1775                 echo '')
1776
1777
1778 # Documentation targets
1779 # ---------------------------------------------------------------------------
1780 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1781                linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1782 PHONY += $(DOC_TARGETS)
1783 $(DOC_TARGETS):
1784         $(Q)$(MAKE) $(build)=Documentation $@
1785
1786
1787 # Rust targets
1788 # ---------------------------------------------------------------------------
1789
1790 # "Is Rust available?" target
1791 PHONY += rustavailable
1792 rustavailable:
1793         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1794
1795 # Documentation target
1796 #
1797 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1798 PHONY += rustdoc
1799 rustdoc: prepare
1800         $(Q)$(MAKE) $(build)=rust $@
1801
1802 # Testing target
1803 PHONY += rusttest
1804 rusttest: prepare
1805         $(Q)$(MAKE) $(build)=rust $@
1806
1807 # Formatting targets
1808 PHONY += rustfmt rustfmtcheck
1809
1810 rustfmt:
1811         $(Q)find $(srctree) $(RCS_FIND_IGNORE) \
1812                 -type f -a -name '*.rs' -a ! -name '*generated*' -print \
1813                 | xargs $(RUSTFMT) $(rustfmt_flags)
1814
1815 rustfmtcheck: rustfmt_flags = --check
1816 rustfmtcheck: rustfmt
1817
1818 # Misc
1819 # ---------------------------------------------------------------------------
1820
1821 PHONY += misc-check
1822 misc-check:
1823         $(Q)$(srctree)/scripts/misc-check
1824
1825 all: misc-check
1826
1827 PHONY += scripts_gdb
1828 scripts_gdb: prepare0
1829         $(Q)$(MAKE) $(build)=scripts/gdb
1830         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1831
1832 ifdef CONFIG_GDB_SCRIPTS
1833 all: scripts_gdb
1834 endif
1835
1836 else # KBUILD_EXTMOD
1837
1838 filechk_kernel.release = echo $(KERNELRELEASE)
1839
1840 ###
1841 # External module support.
1842 # When building external modules the kernel used as basis is considered
1843 # read-only, and no consistency checks are made and the make
1844 # system is not used on the basis kernel. If updates are required
1845 # in the basis kernel ordinary make commands (without M=...) must be used.
1846
1847 # We are always building only modules.
1848 KBUILD_BUILTIN :=
1849 KBUILD_MODULES := 1
1850
1851 build-dir := .
1852
1853 clean-dirs := .
1854 clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json
1855
1856 PHONY += prepare
1857 # now expand this into a simple variable to reduce the cost of shell evaluations
1858 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1859 prepare:
1860         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1861                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1862                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1863                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1864         fi
1865
1866 PHONY += help
1867 help:
1868         @echo  '  Building external modules.'
1869         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1870         @echo  ''
1871         @echo  '  modules         - default target, build the module(s)'
1872         @echo  '  modules_install - install the module'
1873         @echo  '  clean           - remove generated files in module directory only'
1874         @echo  '  rust-analyzer   - generate rust-project.json rust-analyzer support file'
1875         @echo  ''
1876
1877 ifndef CONFIG_MODULES
1878 modules modules_install: __external_modules_error
1879 __external_modules_error:
1880         @echo >&2 '***'
1881         @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1882         @echo >&2 '*** You cannot build or install external modules.'
1883         @echo >&2 '***'
1884         @false
1885 endif
1886
1887 endif # KBUILD_EXTMOD
1888
1889 # ---------------------------------------------------------------------------
1890 # Modules
1891
1892 PHONY += modules modules_install modules_sign modules_prepare
1893
1894 modules_install:
1895         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1896         sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1897
1898 ifeq ($(CONFIG_MODULE_SIG),y)
1899 # modules_sign is a subset of modules_install.
1900 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1901 modules_sign: modules_install
1902         @:
1903 else
1904 modules_sign:
1905         @echo >&2 '***'
1906         @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1907         @echo >&2 '***'
1908         @false
1909 endif
1910
1911 ifdef CONFIG_MODULES
1912
1913 modules.order: $(build-dir)
1914         @:
1915
1916 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1917 # This is solely useful to speed up test compiles.
1918 modules: modpost
1919 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1920         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1921 endif
1922
1923 PHONY += modules_check
1924 modules_check: modules.order
1925         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1926
1927 else # CONFIG_MODULES
1928
1929 modules:
1930         @:
1931
1932 KBUILD_MODULES :=
1933
1934 endif # CONFIG_MODULES
1935
1936 PHONY += modpost
1937 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1938          $(if $(KBUILD_MODULES), modules_check)
1939         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1940
1941 # Single targets
1942 # ---------------------------------------------------------------------------
1943 # To build individual files in subdirectories, you can do like this:
1944 #
1945 #   make foo/bar/baz.s
1946 #
1947 # The supported suffixes for single-target are listed in 'single-targets'
1948 #
1949 # To build only under specific subdirectories, you can do like this:
1950 #
1951 #   make foo/bar/baz/
1952
1953 ifdef single-build
1954
1955 # .ko is special because modpost is needed
1956 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1957 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1958                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1959
1960 $(single-ko): single_modules
1961         @:
1962 $(single-no-ko): $(build-dir)
1963         @:
1964
1965 # Remove modules.order when done because it is not the real one.
1966 PHONY += single_modules
1967 single_modules: $(single-no-ko) modules_prepare
1968         $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order
1969         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1970 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1971         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1972 endif
1973         $(Q)rm -f modules.order
1974
1975 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1976
1977 KBUILD_MODULES := 1
1978
1979 endif
1980
1981 prepare: outputmakefile
1982
1983 # Preset locale variables to speed up the build process. Limit locale
1984 # tweaks to this spot to avoid wrong language settings when running
1985 # make menuconfig etc.
1986 # Error messages still appears in the original language
1987 PHONY += $(build-dir)
1988 $(build-dir): prepare
1989         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1990
1991 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1992 PHONY += $(clean-dirs) clean
1993 $(clean-dirs):
1994         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1995
1996 clean: $(clean-dirs)
1997         $(call cmd,rmfiles)
1998         @find . $(RCS_FIND_IGNORE) \
1999                 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2000                 -o -name '*.ko.*' \
2001                 -o -name '*.dtb' -o -name '*.dtbo' \
2002                 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
2003                 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
2004                 -o -name '*.dwo' -o -name '*.lst' \
2005                 -o -name '*.su' -o -name '*.mod' \
2006                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2007                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2008                 -o -name '*.asn1.[ch]' \
2009                 -o -name '*.symtypes' -o -name 'modules.order' \
2010                 -o -name '*.c.[012]*.*' \
2011                 -o -name '*.ll' \
2012                 -o -name '*.gcno' \
2013                 \) -type f -print \
2014                 -o -name '.tmp_*' -print \
2015                 | xargs rm -rf
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         $(call cmd,tags)
2024
2025 # Generate rust-project.json (a file that describes the structure of non-Cargo
2026 # Rust projects) for rust-analyzer (an implementation of the Language Server
2027 # Protocol).
2028 PHONY += rust-analyzer
2029 rust-analyzer:
2030         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
2031 ifdef KBUILD_EXTMOD
2032 # FIXME: external modules must not descend into a sub-directory of the kernel
2033         $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@
2034 else
2035         $(Q)$(MAKE) $(build)=rust $@
2036 endif
2037
2038 # Script to generate missing namespace dependencies
2039 # ---------------------------------------------------------------------------
2040
2041 PHONY += nsdeps
2042 nsdeps: export KBUILD_NSDEPS=1
2043 nsdeps: modules
2044         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2045
2046 # Clang Tooling
2047 # ---------------------------------------------------------------------------
2048
2049 quiet_cmd_gen_compile_commands = GEN     $@
2050       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2051
2052 compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
2053         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2054         $(if $(CONFIG_MODULES), modules.order) FORCE
2055         $(call if_changed,gen_compile_commands)
2056
2057 targets += compile_commands.json
2058
2059 PHONY += clang-tidy clang-analyzer
2060
2061 ifdef CONFIG_CC_IS_CLANG
2062 quiet_cmd_clang_tools = CHECK   $<
2063       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2064
2065 clang-tidy clang-analyzer: compile_commands.json
2066         $(call cmd,clang_tools)
2067 else
2068 clang-tidy clang-analyzer:
2069         @echo "$@ requires CC=clang" >&2
2070         @false
2071 endif
2072
2073 # Scripts to check various things for consistency
2074 # ---------------------------------------------------------------------------
2075
2076 PHONY += includecheck versioncheck coccicheck
2077
2078 includecheck:
2079         find $(srctree)/* $(RCS_FIND_IGNORE) \
2080                 -name '*.[hcS]' -type f -print | sort \
2081                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2082
2083 versioncheck:
2084         find $(srctree)/* $(RCS_FIND_IGNORE) \
2085                 -name '*.[hcS]' -type f -print | sort \
2086                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2087
2088 coccicheck:
2089         $(Q)$(BASH) $(srctree)/scripts/$@
2090
2091 PHONY += checkstack kernelrelease kernelversion image_name
2092
2093 # UML needs a little special treatment here.  It wants to use the host
2094 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2095 # else wants $(ARCH), including people doing cross-builds, which means
2096 # that $(SUBARCH) doesn't work here.
2097 ifeq ($(ARCH), um)
2098 CHECKSTACK_ARCH := $(SUBARCH)
2099 else
2100 CHECKSTACK_ARCH := $(ARCH)
2101 endif
2102 MINSTACKSIZE    ?= 100
2103 checkstack:
2104         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2105         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2106
2107 kernelrelease:
2108         @$(filechk_kernel.release)
2109
2110 kernelversion:
2111         @echo $(KERNELVERSION)
2112
2113 image_name:
2114         @echo $(KBUILD_IMAGE)
2115
2116 PHONY += run-command
2117 run-command:
2118         $(Q)$(KBUILD_RUN_COMMAND)
2119
2120 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2121       cmd_rmfiles = rm -rf $(rm-files)
2122
2123 # read saved command lines for existing targets
2124 existing-targets := $(wildcard $(sort $(targets)))
2125
2126 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2127
2128 endif # config-build
2129 endif # mixed-build
2130 endif # need-sub-make
2131
2132 PHONY += FORCE
2133 FORCE:
2134
2135 # Declare the contents of the PHONY variable as phony.  We keep that
2136 # information in a variable so we can use it in if_changed and friends.
2137 .PHONY: $(PHONY)