Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 6
   3 PATCHLEVEL = 16
   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 $(KBUILD_EXTMOD).)
 150 endif
 151
 152 export KBUILD_EXTMOD
 153
 154 ifeq ("$(origin W)", "command line")
 155   KBUILD_EXTRA_WARN := $(W)
 156 endif
 157
 158 export KBUILD_EXTRA_WARN
 159
 160 # Kbuild will save output files in the current working directory.
 161 # This does not need to match to the root of the kernel source tree.
 162 #
 163 # For example, you can do this:
 164 #
 165 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 166 #
 167 # If you want to save output files in a different location, there are
 168 # two syntaxes to specify it.
 169 #
 170 # 1) O=
 171 # Use "make O=dir/to/store/output/files/"
 172 #
 173 # 2) Set KBUILD_OUTPUT
 174 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 175 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 176 #
 177 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 178 # variable.
 179
 180 ifeq ("$(origin O)", "command line")
 181   KBUILD_OUTPUT := $(O)
 182 endif
 183
 184 ifdef KBUILD_EXTMOD
 185     ifdef KBUILD_OUTPUT
 186         objtree := $(realpath $(KBUILD_OUTPUT))
 187         $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist))
 188     else
 189         objtree := $(abs_srctree)
 190     endif
 191     # If Make is invoked from the kernel directory (either kernel
 192     # source directory or kernel build directory), external modules
 193     # are built in $(KBUILD_EXTMOD) for backward compatibility,
 194     # otherwise, built in the current directory.
 195     output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD)))
 196     # KBUILD_EXTMOD might be a relative path. Remember its absolute path before
 197     # Make changes the working directory.
 198     srcroot := $(realpath $(KBUILD_EXTMOD))
 199     $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist))
 200 else
 201     objtree := .
 202     output := $(KBUILD_OUTPUT)
 203 endif
 204
 205 export objtree srcroot
 206
 207 # Do we want to change the working directory?
 208 ifneq ($(output),)
 209 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
 210 $(shell mkdir -p "$(output)")
 211 # $(realpath ...) resolves symlinks
 212 abs_output := $(realpath $(output))
 213 $(if $(abs_output),,$(error failed to create output directory "$(output)"))
 214 endif
 215
 216 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 217 $(error source directory cannot contain spaces or colons)
 218 endif
 219
 220 export sub_make_done := 1
 221
 222 endif # sub_make_done
 223
 224 ifeq ($(abs_output),$(CURDIR))
 225 # Suppress "Entering directory ..." if we are at the final work directory.
 226 no-print-directory := --no-print-directory
 227 else
 228 # Recursion to show "Entering directory ..."
 229 need-sub-make := 1
 230 endif
 231
 232 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
 233 # If --no-print-directory is unset, recurse once again to set it.
 234 # You may end up recursing into __sub-make twice. This is needed due to the
 235 # behavior change in GNU Make 4.4.1.
 236 need-sub-make := 1
 237 endif
 238
 239 ifeq ($(need-sub-make),1)
 240
 241 PHONY += $(MAKECMDGOALS) __sub-make
 242
 243 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 244         @:
 245
 246 # Invoke a second make in the output directory, passing relevant variables
 247 __sub-make:
 248         $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \
 249         -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 250
 251 else # need-sub-make
 252
 253 # We process the rest of the Makefile if this is the final invocation of make
 254
 255 ifndef KBUILD_EXTMOD
 256 srcroot := $(abs_srctree)
 257 endif
 258
 259 ifeq ($(srcroot),$(CURDIR))
 260 building_out_of_srctree :=
 261 else
 262 export building_out_of_srctree := 1
 263 endif
 264
 265 ifdef KBUILD_ABS_SRCTREE
 266     # Do nothing. Use the absolute path.
 267 else ifeq ($(srcroot),$(CURDIR))
 268     # Building in the source.
 269     srcroot := .
 270 else ifeq ($(srcroot)/,$(dir $(CURDIR)))
 271     # Building in a subdirectory of the source.
 272     srcroot := ..
 273 endif
 274
 275 export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot))
 276
 277 ifdef building_out_of_srctree
 278 export VPATH := $(srcroot)
 279 else
 280 VPATH :=
 281 endif
 282
 283 # To make sure we do not include .config for any of the *config targets
 284 # catch them early, and hand them over to scripts/kconfig/Makefile
 285 # It is allowed to specify more targets when calling make, including
 286 # mixing *config targets and build targets.
 287 # For example 'make oldconfig all'.
 288 # Detect when mixed targets is specified, and make a second invocation
 289 # of make so .config is not included in this case either (for *config).
 290
 291 version_h := include/generated/uapi/linux/version.h
 292
 293 clean-targets := %clean mrproper cleandocs
 294 no-dot-config-targets := $(clean-targets) \
 295                          cscope gtags TAGS tags help% %docs check% coccicheck \
 296                          $(version_h) headers headers_% archheaders archscripts \
 297                          %asm-generic kernelversion %src-pkg dt_binding_check \
 298                          outputmakefile rustavailable rustfmt rustfmtcheck
 299 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
 300                           image_name
 301 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/
 302
 303 config-build    :=
 304 mixed-build     :=
 305 need-config     := 1
 306 may-sync-config := 1
 307 single-build    :=
 308
 309 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 310     ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 311         need-config :=
 312     endif
 313 endif
 314
 315 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 316     ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 317         may-sync-config :=
 318     endif
 319 endif
 320
 321 need-compiler := $(may-sync-config)
 322
 323 ifneq ($(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 = $(call read-file, $(objtree)/include/config/kernel.release)
 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=arm64
 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=aarch64-linux-gnu-
 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 # the KERNELDOC macro needs to be exported, as scripts/Makefile.build
 462 # has a logic to call it
 463 KERNELDOC       = $(srctree)/scripts/kernel-doc.py
 464 export KERNELDOC
 465
 466 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 467                          -O2 -fomit-frame-pointer -std=gnu11
 468 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 469 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 470
 471 # These flags apply to all Rust code in the tree, including the kernel and
 472 # host programs.
 473 export rust_common_flags := --edition=2021 \
 474                             -Zbinary_dep_depinfo=y \
 475                             -Astable_features \
 476                             -Dnon_ascii_idents \
 477                             -Dunsafe_op_in_unsafe_fn \
 478                             -Wmissing_docs \
 479                             -Wrust_2018_idioms \
 480                             -Wunreachable_pub \
 481                             -Wclippy::all \
 482                             -Wclippy::ignored_unit_patterns \
 483                             -Wclippy::mut_mut \
 484                             -Wclippy::needless_bitwise_bool \
 485                             -Aclippy::needless_lifetimes \
 486                             -Wclippy::no_mangle_with_rust_abi \
 487                             -Wclippy::undocumented_unsafe_blocks \
 488                             -Wclippy::unnecessary_safety_comment \
 489                             -Wclippy::unnecessary_safety_doc \
 490                             -Wrustdoc::missing_crate_level_docs \
 491                             -Wrustdoc::unescaped_backticks
 492
 493 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
 494                        $(HOSTCFLAGS) -I $(srctree)/scripts/include
 495 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
 496                        -I $(srctree)/scripts/include
 497 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 498                         -Zallow-features= $(HOSTRUSTFLAGS)
 499 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 500 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 501 KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS))
 502
 503 # Make variables (CC, etc...)
 504 CPP             = $(CC) -E
 505 ifneq ($(LLVM),)
 506 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 507 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 508 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 509 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 510 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 511 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 512 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 513 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 514 else
 515 CC              = $(CROSS_COMPILE)gcc
 516 LD              = $(CROSS_COMPILE)ld
 517 AR              = $(CROSS_COMPILE)ar
 518 NM              = $(CROSS_COMPILE)nm
 519 OBJCOPY         = $(CROSS_COMPILE)objcopy
 520 OBJDUMP         = $(CROSS_COMPILE)objdump
 521 READELF         = $(CROSS_COMPILE)readelf
 522 STRIP           = $(CROSS_COMPILE)strip
 523 endif
 524 RUSTC           = rustc
 525 RUSTDOC         = rustdoc
 526 RUSTFMT         = rustfmt
 527 CLIPPY_DRIVER   = clippy-driver
 528 BINDGEN         = bindgen
 529 PAHOLE          = pahole
 530 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 531 LEX             = flex
 532 YACC            = bison
 533 AWK             = awk
 534 INSTALLKERNEL  := installkernel
 535 PERL            = perl
 536 PYTHON3         = python3
 537 CHECK           = sparse
 538 BASH            = bash
 539 KGZIP           = gzip
 540 KBZIP2          = bzip2
 541 KLZOP           = lzop
 542 LZMA            = lzma
 543 LZ4             = lz4
 544 XZ              = xz
 545 ZSTD            = zstd
 546
 547 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 548                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 549 NOSTDINC_FLAGS :=
 550 CFLAGS_MODULE   =
 551 RUSTFLAGS_MODULE =
 552 AFLAGS_MODULE   =
 553 LDFLAGS_MODULE  =
 554 CFLAGS_KERNEL   =
 555 RUSTFLAGS_KERNEL =
 556 AFLAGS_KERNEL   =
 557 LDFLAGS_vmlinux =
 558
 559 # Use USERINCLUDE when you must reference the UAPI directories only.
 560 USERINCLUDE    := \
 561                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 562                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 563                 -I$(srctree)/include/uapi \
 564                 -I$(objtree)/include/generated/uapi \
 565                 -include $(srctree)/include/linux/compiler-version.h \
 566                 -include $(srctree)/include/linux/kconfig.h
 567
 568 # Use LINUXINCLUDE when you must reference the include/ directory.
 569 # Needed to be compatible with the O= option
 570 LINUXINCLUDE    := \
 571                 -I$(srctree)/arch/$(SRCARCH)/include \
 572                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 573                 -I$(srctree)/include \
 574                 -I$(objtree)/include \
 575                 $(USERINCLUDE)
 576
 577 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 578
 579 KBUILD_CFLAGS :=
 580 KBUILD_CFLAGS += -std=gnu11
 581 KBUILD_CFLAGS += -fshort-wchar
 582 KBUILD_CFLAGS += -funsigned-char
 583 KBUILD_CFLAGS += -fno-common
 584 KBUILD_CFLAGS += -fno-PIE
 585 KBUILD_CFLAGS += -fno-strict-aliasing
 586
 587 KBUILD_CPPFLAGS := -D__KERNEL__
 588 KBUILD_RUSTFLAGS := $(rust_common_flags) \
 589                     -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 590                     -Cforce-unwind-tables=n -Ccodegen-units=1 \
 591                     -Csymbol-mangling-version=v0 \
 592                     -Crelocation-model=static \
 593                     -Zfunction-sections=n \
 594                     -Wclippy::float_arithmetic
 595
 596 KBUILD_AFLAGS_KERNEL :=
 597 KBUILD_CFLAGS_KERNEL :=
 598 KBUILD_RUSTFLAGS_KERNEL :=
 599 KBUILD_AFLAGS_MODULE  := -DMODULE
 600 KBUILD_CFLAGS_MODULE  := -DMODULE
 601 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 602 KBUILD_LDFLAGS_MODULE :=
 603 KBUILD_LDFLAGS :=
 604 CLANG_FLAGS :=
 605
 606 ifeq ($(KBUILD_CLIPPY),1)
 607         RUSTC_OR_CLIPPY_QUIET := CLIPPY
 608         RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 609 else
 610         RUSTC_OR_CLIPPY_QUIET := RUSTC
 611         RUSTC_OR_CLIPPY = $(RUSTC)
 612 endif
 613
 614 # Allows the usage of unstable features in stable compilers.
 615 export RUSTC_BOOTSTRAP := 1
 616
 617 # Allows finding `.clippy.toml` in out-of-srctree builds.
 618 export CLIPPY_CONF_DIR := $(srctree)
 619
 620 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 621 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
 622 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 623 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 624 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 625 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 626 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE
 627 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 628
 629 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 630 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 631 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 632 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 633 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 634 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 635
 636 # Files to ignore in find ... statements
 637
 638 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 639                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 640                           -prune -o
 641
 642 # ===========================================================================
 643 # Rules shared between *config targets and build targets
 644
 645 # Basic helpers built in scripts/basic/
 646 PHONY += scripts_basic
 647 scripts_basic:
 648         $(Q)$(MAKE) $(build)=scripts/basic
 649
 650 PHONY += outputmakefile
 651 ifdef building_out_of_srctree
 652 # Before starting out-of-tree build, make sure the source tree is clean.
 653 # outputmakefile generates a Makefile in the output directory, if using a
 654 # separate output directory. This allows convenient use of make in the
 655 # output directory.
 656 # At the same time when output Makefile generated, generate .gitignore to
 657 # ignore whole output directory
 658
 659 ifdef KBUILD_EXTMOD
 660 print_env_for_makefile = \
 661         echo "export KBUILD_OUTPUT = $(objtree)"; \
 662         echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \
 663         echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)"
 664 else
 665 print_env_for_makefile = \
 666         echo "export KBUILD_OUTPUT = $(CURDIR)"
 667 endif
 668
 669 quiet_cmd_makefile = GEN     Makefile
 670       cmd_makefile = { \
 671         echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \
 672         $(print_env_for_makefile); \
 673         echo "include $(abs_srctree)/Makefile"; \
 674         } > Makefile
 675
 676 outputmakefile:
 677 ifeq ($(KBUILD_EXTMOD),)
 678         @if [ -f $(srctree)/.config -o \
 679                  -d $(srctree)/include/config -o \
 680                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 681                 echo >&2 "***"; \
 682                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 683                 echo >&2 "*** in $(abs_srctree)";\
 684                 echo >&2 "***"; \
 685                 false; \
 686         fi
 687 else
 688         @if [ -f $(srcroot)/modules.order ]; then \
 689                 echo >&2 "***"; \
 690                 echo >&2 "*** The external module source tree is not clean."; \
 691                 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \
 692                 echo >&2 "***"; \
 693                 false; \
 694         fi
 695 endif
 696         $(Q)ln -fsn $(srcroot) source
 697         $(call cmd,makefile)
 698         $(Q)test -e .gitignore || \
 699         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 700 endif
 701
 702 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 703 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 704 # CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they
 705 # need export), and from include/config/auto.conf.cmd to detect the compiler
 706 # upgrade.
 707 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 708 RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null))
 709
 710 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 711 include $(srctree)/scripts/Makefile.clang
 712 endif
 713
 714 # Include this also for config targets because some architectures need
 715 # cc-cross-prefix to determine CROSS_COMPILE.
 716 ifdef need-compiler
 717 include $(srctree)/scripts/Makefile.compiler
 718 endif
 719
 720 ifdef config-build
 721 # ===========================================================================
 722 # *config targets only - make sure prerequisites are updated, and descend
 723 # in scripts/kconfig to make the *config target
 724
 725 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
 726 # KBUILD_DEFCONFIG may point out an alternative default configuration
 727 # used for 'make defconfig'
 728 include $(srctree)/arch/$(SRCARCH)/Makefile
 729 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT
 730
 731 config: outputmakefile scripts_basic FORCE
 732         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 733
 734 %config: outputmakefile scripts_basic FORCE
 735         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 736
 737 else #!config-build
 738 # ===========================================================================
 739 # Build targets only - this includes vmlinux, arch-specific targets, clean
 740 # targets and others. In general all targets except *config targets.
 741
 742 # If building an external module we do not care about the all: rule
 743 # but instead __all depend on modules
 744 PHONY += all
 745 ifeq ($(KBUILD_EXTMOD),)
 746 __all: all
 747 else
 748 __all: modules
 749 endif
 750
 751 targets :=
 752
 753 # Decide whether to build built-in, modular, or both.
 754 # Normally, just do built-in.
 755
 756 KBUILD_MODULES :=
 757 KBUILD_BUILTIN := y
 758
 759 # If we have only "make modules", don't compile built-in objects.
 760 ifeq ($(MAKECMDGOALS),modules)
 761   KBUILD_BUILTIN :=
 762 endif
 763
 764 # If we have "make <whatever> modules", compile modules
 765 # in addition to whatever we do anyway.
 766 # Just "make" or "make all" shall build modules as well
 767
 768 ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),)
 769   KBUILD_MODULES := y
 770 endif
 771
 772 ifeq ($(MAKECMDGOALS),)
 773   KBUILD_MODULES := y
 774 endif
 775
 776 export KBUILD_MODULES KBUILD_BUILTIN
 777
 778 ifdef need-config
 779 include $(objtree)/include/config/auto.conf
 780 endif
 781
 782 ifeq ($(KBUILD_EXTMOD),)
 783 # Objects we will link into vmlinux / subdirs we need to visit
 784 core-y          :=
 785 drivers-y       :=
 786 libs-y          := lib/
 787 endif # KBUILD_EXTMOD
 788
 789 # The all: target is the default when no target is given on the
 790 # command line.
 791 # This allow a user to issue only 'make' to build a kernel including modules
 792 # Defaults to vmlinux, but the arch makefile usually adds further targets
 793 all: vmlinux
 794
 795 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 796 ifdef CONFIG_CC_IS_GCC
 797 CFLAGS_GCOV     += -fno-tree-loop-im
 798 endif
 799 export CFLAGS_GCOV
 800
 801 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 802 ifdef CONFIG_FUNCTION_TRACER
 803   CC_FLAGS_FTRACE := -pg
 804 endif
 805
 806 include $(srctree)/arch/$(SRCARCH)/Makefile
 807
 808 ifdef need-config
 809 ifdef may-sync-config
 810 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 811 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 812 # because some architectures define CROSS_COMPILE there.
 813 include include/config/auto.conf.cmd
 814
 815 $(KCONFIG_CONFIG):
 816         @echo >&2 '***'
 817         @echo >&2 '*** Configuration file "$@" not found!'
 818         @echo >&2 '***'
 819         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 820         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 821         @echo >&2 '***'
 822         @/bin/false
 823
 824 # The actual configuration files used during the build are stored in
 825 # include/generated/ and include/config/. Update them if .config is newer than
 826 # include/config/auto.conf (which mirrors .config).
 827 #
 828 # This exploits the 'multi-target pattern rule' trick.
 829 # The syncconfig should be executed only once to make all the targets.
 830 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 831 #
 832 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 833 # so you cannot notice that Kconfig is waiting for the user input.
 834 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 835         $(Q)$(kecho) "  SYNC    $@"
 836         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 837 else # !may-sync-config
 838 # External modules and some install targets need include/generated/autoconf.h
 839 # and include/config/auto.conf but do not care if they are up-to-date.
 840 # Use auto.conf to show the error message
 841
 842 checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf)
 843 missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs))
 844
 845 ifdef missing-configs
 846 PHONY += $(objtree)/include/config/auto.conf
 847
 848 $(objtree)/include/config/auto.conf:
 849         @echo   >&2 '***'
 850         @echo   >&2 '***  ERROR: Kernel configuration is invalid. The following files are missing:'
 851         @printf >&2 '***    - %s\n' $(missing-configs)
 852         @echo   >&2 '***  Run "make oldconfig && make prepare" on kernel source to fix it.'
 853         @echo   >&2 '***'
 854         @/bin/false
 855 endif
 856
 857 endif # may-sync-config
 858 endif # need-config
 859
 860 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 861
 862 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 863 KBUILD_CFLAGS += -O2
 864 KBUILD_RUSTFLAGS += -Copt-level=2
 865 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 866 KBUILD_CFLAGS += -Os
 867 KBUILD_RUSTFLAGS += -Copt-level=s
 868 endif
 869
 870 # Always set `debug-assertions` and `overflow-checks` because their default
 871 # depends on `opt-level` and `debug-assertions`, respectively.
 872 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 873 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 874
 875 # Tell gcc to never replace conditional load with a non-conditional one
 876 ifdef CONFIG_CC_IS_GCC
 877 # gcc-10 renamed --param=allow-store-data-races=0 to
 878 # -fno-allow-store-data-races.
 879 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 880 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 881 endif
 882
 883 ifdef CONFIG_READABLE_ASM
 884 # Disable optimizations that make assembler listings hard to read.
 885 # reorder blocks reorders the control in the function
 886 # ipa clone creates specialized cloned functions
 887 # partial inlining inlines only parts of functions
 888 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 889 endif
 890
 891 stackp-flags-y                                    := -fno-stack-protector
 892 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 893 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 894
 895 KBUILD_CFLAGS += $(stackp-flags-y)
 896
 897 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 898 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 899
 900 ifdef CONFIG_FRAME_POINTER
 901 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 902 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 903 else
 904 # Some targets (ARM with Thumb2, for example), can't be built with frame
 905 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 906 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 907 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 908 # -fomit-frame-pointer with FUNCTION_TRACER.
 909 # In the Rust target specification, "frame-pointer" is set explicitly
 910 # to "may-omit".
 911 ifndef CONFIG_FUNCTION_TRACER
 912 KBUILD_CFLAGS   += -fomit-frame-pointer
 913 endif
 914 endif
 915
 916 # Initialize all stack variables with a 0xAA pattern.
 917 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 918 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 919 endif
 920
 921 # Initialize all stack variables with a zero value.
 922 ifdef CONFIG_INIT_STACK_ALL_ZERO
 923 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 924 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 925 # https://github.com/llvm/llvm-project/issues/44842
 926 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 927 export CC_AUTO_VAR_INIT_ZERO_ENABLER
 928 KBUILD_CFLAGS   += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
 929 endif
 930 endif
 931
 932 # Explicitly clear padding bits during variable initialization
 933 KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all)
 934
 935 # While VLAs have been removed, GCC produces unreachable stack probes
 936 # for the randomize_kstack_offset feature. Disable it for all compilers.
 937 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 938
 939 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 940 ifdef CONFIG_ZERO_CALL_USED_REGS
 941 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 942 endif
 943
 944 ifdef CONFIG_FUNCTION_TRACER
 945 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 946   CC_FLAGS_FTRACE       += -mrecord-mcount
 947   ifdef CONFIG_HAVE_NOP_MCOUNT
 948     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 949       CC_FLAGS_FTRACE   += -mnop-mcount
 950       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 951     endif
 952   endif
 953 endif
 954 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 955   ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
 956     CC_FLAGS_USING      += -DCC_USING_NOP_MCOUNT
 957   endif
 958 endif
 959 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 960   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 961     BUILD_C_RECORDMCOUNT := y
 962     export BUILD_C_RECORDMCOUNT
 963   endif
 964 endif
 965 ifdef CONFIG_HAVE_FENTRY
 966   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 967   ifeq ($(call cc-option-yn, -mfentry),y)
 968     CC_FLAGS_FTRACE     += -mfentry
 969     CC_FLAGS_USING      += -DCC_USING_FENTRY
 970   endif
 971 endif
 972 export CC_FLAGS_FTRACE
 973 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 974 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 975 endif
 976
 977 # We trigger additional mismatches with less inlining
 978 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 979 KBUILD_CFLAGS += -fno-inline-functions-called-once
 980 endif
 981
 982 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 983 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 984 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 985 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 986 LDFLAGS_vmlinux += --gc-sections
 987 endif
 988
 989 ifdef CONFIG_SHADOW_CALL_STACK
 990 ifndef CONFIG_DYNAMIC_SCS
 991 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 992 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 993 KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack
 994 endif
 995 export CC_FLAGS_SCS
 996 endif
 997
 998 ifdef CONFIG_LTO_CLANG
 999 ifdef CONFIG_LTO_CLANG_THIN
1000 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
1001 else
1002 CC_FLAGS_LTO    := -flto
1003 endif
1004 CC_FLAGS_LTO    += -fvisibility=hidden
1005
1006 # Limit inlining across translation units to reduce binary size
1007 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
1008 endif
1009
1010 ifdef CONFIG_LTO
1011 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
1012 KBUILD_AFLAGS   += -fno-lto
1013 export CC_FLAGS_LTO
1014 endif
1015
1016 ifdef CONFIG_CFI_CLANG
1017 CC_FLAGS_CFI    := -fsanitize=kcfi
1018 ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS
1019         CC_FLAGS_CFI    += -fsanitize-cfi-icall-experimental-normalize-integers
1020 endif
1021 ifdef CONFIG_FINEIBT_BHI
1022         CC_FLAGS_CFI    += -fsanitize-kcfi-arity
1023 endif
1024 ifdef CONFIG_RUST
1025         # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects
1026         # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS.
1027         RUSTC_FLAGS_CFI   := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers
1028         KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI)
1029         export RUSTC_FLAGS_CFI
1030 endif
1031 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
1032 export CC_FLAGS_CFI
1033 endif
1034
1035 # Architectures can define flags to add/remove for floating-point support
1036 CC_FLAGS_FPU    += -D_LINUX_FPU_COMPILATION_UNIT
1037 export CC_FLAGS_FPU
1038 export CC_FLAGS_NO_FPU
1039
1040 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1041 # Set the minimal function alignment. Use the newer GCC option
1042 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
1043 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
1044 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
1045 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
1046 else
1047 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1048 endif
1049 endif
1050
1051 # arch Makefile may override CC so keep this after arch Makefile is included
1052 NOSTDINC_FLAGS += -nostdinc
1053
1054 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
1055 # the kernel uses only C99 flexible arrays for dynamically sized trailing
1056 # arrays. Enforce this for everything that may examine structure sizes and
1057 # perform bounds checking.
1058 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
1059
1060 # disable invalid "can't wrap" optimizations for signed / pointers
1061 KBUILD_CFLAGS   += -fno-strict-overflow
1062
1063 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1064 KBUILD_CFLAGS  += -fno-stack-check
1065
1066 # conserve stack if available
1067 ifdef CONFIG_CC_IS_GCC
1068 KBUILD_CFLAGS   += -fconserve-stack
1069 endif
1070
1071 # Ensure compilers do not transform certain loops into calls to wcslen()
1072 KBUILD_CFLAGS += -fno-builtin-wcslen
1073
1074 # change __FILE__ to the relative path to the source directory
1075 ifdef building_out_of_srctree
1076 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
1077 endif
1078
1079 # include additional Makefiles when needed
1080 include-y                       := scripts/Makefile.extrawarn
1081 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1082 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1083 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1084 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1085 include-$(CONFIG_KMSAN)         += scripts/Makefile.kmsan
1086 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1087 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1088 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1089 include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo
1090 include-$(CONFIG_PROPELLER_CLANG)       += scripts/Makefile.propeller
1091 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1092
1093 include $(addprefix $(srctree)/, $(include-y))
1094
1095 # scripts/Makefile.gcc-plugins is intentionally included last.
1096 # Do not add $(call cc-option,...) below this line. When you build the kernel
1097 # from the clean source tree, the GCC plugins do not exist at this point.
1098
1099 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1100 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1101 KBUILD_AFLAGS   += $(KAFLAGS)
1102 KBUILD_CFLAGS   += $(KCFLAGS)
1103 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1104
1105 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1106 LDFLAGS_vmlinux += --build-id=sha1
1107
1108 KBUILD_LDFLAGS  += -z noexecstack
1109 ifeq ($(CONFIG_LD_IS_BFD),y)
1110 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
1111 endif
1112
1113 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1114 LDFLAGS_vmlinux += -X
1115 endif
1116
1117 ifeq ($(CONFIG_RELR),y)
1118 # ld.lld before 15 did not support -z pack-relative-relocs.
1119 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1120 endif
1121
1122 # We never want expected sections to be placed heuristically by the
1123 # linker. All sections should be explicitly named in the linker script.
1124 ifdef CONFIG_LD_ORPHAN_WARN
1125 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1126 endif
1127
1128 ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),)
1129 LDFLAGS_vmlinux += --emit-relocs --discard-none
1130 endif
1131
1132 # Align the bit size of userspace programs with the kernel
1133 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
1134 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
1135
1136 # userspace programs are linked via the compiler, use the correct linker
1137 ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_LD_IS_LLD),yy)
1138 KBUILD_USERLDFLAGS += --ld-path=$(LD)
1139 endif
1140
1141 # make the checker run with the right architecture
1142 CHECKFLAGS += --arch=$(ARCH)
1143
1144 # insure the checker run with the right endianness
1145 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1146
1147 # the checker needs the correct machine size
1148 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1149
1150 # Default kernel image to build when no specific target is given.
1151 # KBUILD_IMAGE may be overruled on the command line or
1152 # set in the environment
1153 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1154 # this default value
1155 export KBUILD_IMAGE ?= vmlinux
1156
1157 #
1158 # INSTALL_PATH specifies where to place the updated kernel and system map
1159 # images. Default is /boot, but you can set it to other values
1160 export  INSTALL_PATH ?= /boot
1161
1162 #
1163 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1164 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1165 # an argument if needed. Otherwise it defaults to the kernel install path
1166 #
1167 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1168
1169 #
1170 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1171 # relocations required by build roots.  This is not defined in the
1172 # makefile but the argument can be passed to make if needed.
1173 #
1174
1175 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1176 export MODLIB
1177
1178 PHONY += prepare0
1179
1180 ifeq ($(KBUILD_EXTMOD),)
1181
1182 build-dir       := .
1183 clean-dirs      := $(sort . Documentation \
1184                      $(patsubst %/,%,$(filter %/, $(core-) \
1185                         $(drivers-) $(libs-))))
1186
1187 export ARCH_CORE        := $(core-y)
1188 export ARCH_LIB         := $(filter %/, $(libs-y))
1189 export ARCH_DRIVERS     := $(drivers-y) $(drivers-m)
1190 # Externally visible symbols (used by link-vmlinux.sh)
1191
1192 KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1193 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1194
1195 export KBUILD_VMLINUX_LIBS
1196 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1197
1198 ifdef CONFIG_TRIM_UNUSED_KSYMS
1199 # For the kernel to actually contain only the needed exported symbols,
1200 # we have to build modules as well to determine what those symbols are.
1201 KBUILD_MODULES := y
1202 endif
1203
1204 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1205 quiet_cmd_ar_vmlinux.a = AR      $@
1206       cmd_ar_vmlinux.a = \
1207         rm -f $@; \
1208         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1209         $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1210
1211 targets += vmlinux.a
1212 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1213         $(call if_changed,ar_vmlinux.a)
1214
1215 PHONY += vmlinux_o
1216 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1217         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1218
1219 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1220         @:
1221
1222 PHONY += vmlinux
1223 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1224 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1225 # unrelated; the decompressors just happen to have the same base name,
1226 # arch/*/boot/compressed/vmlinux.
1227 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1228 #
1229 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1230 #   https://savannah.gnu.org/bugs/?61463
1231 # For Make > 4.4, the following simple code will work:
1232 #  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1233 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1234 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1235 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1236         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1237
1238 # The actual objects are generated when descending,
1239 # make sure no implicit rule kicks in
1240 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1241
1242 ifeq ($(origin KERNELRELEASE),file)
1243 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1244 else
1245 filechk_kernel.release = echo $(KERNELRELEASE)
1246 endif
1247
1248 # Store (new) KERNELRELEASE string in include/config/kernel.release
1249 include/config/kernel.release: FORCE
1250         $(call filechk,kernel.release)
1251
1252 # Additional helpers built in scripts/
1253 # Carefully list dependencies so we do not try to build scripts twice
1254 # in parallel
1255 PHONY += scripts
1256 scripts: scripts_basic scripts_dtc
1257         $(Q)$(MAKE) $(build)=$(@)
1258
1259 # Things we need to do before we recursively start building the kernel
1260 # or the modules are listed in "prepare".
1261 # A multi level approach is used. prepareN is processed before prepareN-1.
1262 # archprepare is used in arch Makefiles and when processed asm symlink,
1263 # version.h and scripts_basic is processed / created.
1264
1265 PHONY += prepare archprepare
1266
1267 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1268         asm-generic $(version_h) include/generated/utsrelease.h \
1269         include/generated/compile.h include/generated/autoconf.h \
1270         include/generated/rustc_cfg remove-stale-files
1271
1272 prepare0: archprepare
1273         $(Q)$(MAKE) $(build)=scripts/mod
1274         $(Q)$(MAKE) $(build)=. prepare
1275
1276 # All the preparing..
1277 prepare: prepare0
1278 ifdef CONFIG_RUST
1279         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1280         $(Q)$(MAKE) $(build)=rust
1281 endif
1282
1283 PHONY += remove-stale-files
1284 remove-stale-files:
1285         $(Q)$(srctree)/scripts/remove-stale-files
1286
1287 # Support for using generic headers in asm-generic
1288 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1289
1290 PHONY += asm-generic uapi-asm-generic
1291 asm-generic: uapi-asm-generic
1292         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1293         generic=include/asm-generic
1294 uapi-asm-generic:
1295         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1296         generic=include/uapi/asm-generic
1297
1298 # Generate some files
1299 # ---------------------------------------------------------------------------
1300
1301 # KERNELRELEASE can change from a few different places, meaning version.h
1302 # needs to be updated, so this check is forced on all builds
1303
1304 uts_len := 64
1305 define filechk_utsrelease.h
1306         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1307           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1308           exit 1;                                                         \
1309         fi;                                                               \
1310         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1311 endef
1312
1313 define filechk_version.h
1314         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1315                 echo \#define LINUX_VERSION_CODE $(shell                 \
1316                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1317         else                                                             \
1318                 echo \#define LINUX_VERSION_CODE $(shell                 \
1319                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1320         fi;                                                              \
1321         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1322         ((c) > 255 ? 255 : (c)))';                                       \
1323         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1324         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1325         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1326 endef
1327
1328 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1329 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1330 $(version_h): FORCE
1331         $(call filechk,version.h)
1332
1333 include/generated/utsrelease.h: include/config/kernel.release FORCE
1334         $(call filechk,utsrelease.h)
1335
1336 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1337         "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1338
1339 include/generated/compile.h: FORCE
1340         $(call filechk,compile.h)
1341
1342 PHONY += headerdep
1343 headerdep:
1344         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1345         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1346
1347 # ---------------------------------------------------------------------------
1348 # Kernel headers
1349
1350 #Default location for installed headers
1351 export INSTALL_HDR_PATH = $(objtree)/usr
1352
1353 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1354       cmd_headers_install = \
1355         mkdir -p $(INSTALL_HDR_PATH); \
1356         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1357         usr/include $(INSTALL_HDR_PATH)
1358
1359 PHONY += headers_install
1360 headers_install: headers
1361         $(call cmd,headers_install)
1362
1363 PHONY += archheaders archscripts
1364
1365 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1366
1367 PHONY += headers
1368 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders
1369 ifdef HEADER_ARCH
1370         $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers
1371 else
1372         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1373         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1374 endif
1375
1376 ifdef CONFIG_HEADERS_INSTALL
1377 prepare: headers
1378 endif
1379
1380 PHONY += scripts_unifdef
1381 scripts_unifdef: scripts_basic
1382         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1383
1384 PHONY += scripts_gen_packed_field_checks
1385 scripts_gen_packed_field_checks: scripts_basic
1386         $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks
1387
1388 # ---------------------------------------------------------------------------
1389 # Install
1390
1391 # Many distributions have the custom install script, /sbin/installkernel.
1392 # If DKMS is installed, 'make install' will eventually recurse back
1393 # to this Makefile to build and install external modules.
1394 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1395
1396 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1397       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1398
1399 # ---------------------------------------------------------------------------
1400 # vDSO install
1401
1402 PHONY += vdso_install
1403 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1404 vdso_install:
1405         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
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 # The tools build system is not a part of Kbuild and tends to introduce
1421 # its own unique issues. If you need to integrate a new tool into Kbuild,
1422 # please consider locating that tool outside the tools/ tree and using the
1423 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1424 # here. See Documentation/kbuild/makefiles.rst for details.
1425
1426 PHONY += resolve_btfids_clean
1427
1428 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1429
1430 # tools/bpf/resolve_btfids directory might not exist
1431 # in output directory, skip its clean in that case
1432 resolve_btfids_clean:
1433 ifneq ($(wildcard $(resolve_btfids_O)),)
1434         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1435 endif
1436
1437 tools/: FORCE
1438         $(Q)mkdir -p $(objtree)/tools
1439         $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1440
1441 tools/%: FORCE
1442         $(Q)mkdir -p $(objtree)/tools
1443         $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1444
1445 # ---------------------------------------------------------------------------
1446 # Kernel selftest
1447
1448 PHONY += kselftest
1449 kselftest: headers
1450         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1451
1452 kselftest-%: headers FORCE
1453         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1454
1455 PHONY += kselftest-merge
1456 kselftest-merge:
1457         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1458         $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1459                 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1460         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1461
1462 # ---------------------------------------------------------------------------
1463 # Devicetree files
1464
1465 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1466 dtstree := arch/$(SRCARCH)/boot/dts
1467 endif
1468
1469 ifneq ($(dtstree),)
1470
1471 %.dtb: dtbs_prepare
1472         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1473
1474 %.dtbo: dtbs_prepare
1475         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1476
1477 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1478 dtbs: dtbs_prepare
1479         $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1480
1481 # include/config/kernel.release is actually needed when installing DTBs because
1482 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1483 # dtbs_install depend on it as dtbs_install may run as root.
1484 dtbs_prepare: include/config/kernel.release scripts_dtc
1485
1486 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1487 export CHECK_DTBS=y
1488 endif
1489
1490 ifneq ($(CHECK_DTBS),)
1491 dtbs_prepare: dt_binding_schemas
1492 endif
1493
1494 dtbs_check: dtbs
1495
1496 dtbs_install:
1497         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1498
1499 ifdef CONFIG_OF_EARLY_FLATTREE
1500 all: dtbs
1501 endif
1502
1503 ifdef CONFIG_GENERIC_BUILTIN_DTB
1504 vmlinux: dtbs
1505 endif
1506
1507 endif
1508
1509 PHONY += scripts_dtc
1510 scripts_dtc: scripts_basic
1511         $(Q)$(MAKE) $(build)=scripts/dtc
1512
1513 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1514 export CHECK_DTBS=y
1515 endif
1516
1517 PHONY += dt_binding_check dt_binding_schemas
1518 dt_binding_check: dt_binding_schemas scripts_dtc
1519         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1520
1521 dt_binding_schemas:
1522         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1523
1524 PHONY += dt_compatible_check
1525 dt_compatible_check: dt_binding_schemas
1526         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1527
1528 # ---------------------------------------------------------------------------
1529 # Modules
1530
1531 ifdef CONFIG_MODULES
1532
1533 # By default, build modules as well
1534
1535 all: modules
1536
1537 # When we're building modules with modversions, we need to consider
1538 # the built-in objects during the descend as well, in order to
1539 # make sure the checksums are up to date before we record them.
1540 ifdef CONFIG_MODVERSIONS
1541   KBUILD_BUILTIN := y
1542 endif
1543
1544 # Build modules
1545 #
1546
1547 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1548 # is an exception.
1549 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1550 KBUILD_BUILTIN := y
1551 modules: vmlinux
1552 endif
1553
1554 modules: modules_prepare
1555
1556 # Target to prepare building external modules
1557 modules_prepare: prepare
1558         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1559
1560 endif # CONFIG_MODULES
1561
1562 ###
1563 # Cleaning is done on three levels.
1564 # make clean     Delete most generated files
1565 #                Leave enough to build external modules
1566 # make mrproper  Delete the current configuration, and all generated files
1567 # make distclean Remove editor backup files, patch leftover files and the like
1568
1569 # Directories & files removed with 'make clean'
1570 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1571                modules.builtin modules.builtin.modinfo modules.nsdeps \
1572                modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \
1573                compile_commands.json rust/test \
1574                rust-project.json .vmlinux.objs .vmlinux.export.c \
1575                .builtin-dtbs-list .builtin-dtb.S
1576
1577 # Directories & files removed with 'make mrproper'
1578 MRPROPER_FILES += include/config include/generated          \
1579                   arch/$(SRCARCH)/include/generated .objdiff \
1580                   debian snap tar-install PKGBUILD pacman \
1581                   .config .config.old .version \
1582                   Module.symvers \
1583                   certs/signing_key.pem \
1584                   certs/x509.genkey \
1585                   vmlinux-gdb.py \
1586                   rpmbuild \
1587                   rust/libmacros.so rust/libmacros.dylib
1588
1589 # clean - Delete most, but leave enough to build external modules
1590 #
1591 clean: private rm-files := $(CLEAN_FILES)
1592
1593 PHONY += archclean vmlinuxclean
1594
1595 vmlinuxclean:
1596         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1597         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1598
1599 clean: archclean vmlinuxclean resolve_btfids_clean
1600
1601 # mrproper - Delete all generated files, including .config
1602 #
1603 mrproper: private rm-files := $(MRPROPER_FILES)
1604 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1605
1606 PHONY += $(mrproper-dirs) mrproper
1607 $(mrproper-dirs):
1608         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1609
1610 mrproper: clean $(mrproper-dirs)
1611         $(call cmd,rmfiles)
1612         @find . $(RCS_FIND_IGNORE) \
1613                 \( -name '*.rmeta' \) \
1614                 -type f -print | xargs rm -f
1615
1616 # distclean
1617 #
1618 PHONY += distclean
1619
1620 distclean: mrproper
1621         @find . $(RCS_FIND_IGNORE) \
1622                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1623                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1624                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1625                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1626                 -type f -print | xargs rm -f
1627
1628
1629 # Packaging of the kernel to various formats
1630 # ---------------------------------------------------------------------------
1631
1632 %src-pkg: FORCE
1633         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1634 %pkg: include/config/kernel.release FORCE
1635         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1636
1637 # Brief documentation of the typical targets used
1638 # ---------------------------------------------------------------------------
1639
1640 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1641 boards := $(sort $(notdir $(boards)))
1642 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1643 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1644
1645 PHONY += help
1646 help:
1647         @echo  'Cleaning targets:'
1648         @echo  '  clean           - Remove most generated files but keep the config and'
1649         @echo  '                    enough build support to build external modules'
1650         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1651         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1652         @echo  ''
1653         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1654         @echo  ''
1655         @echo  'Other generic targets:'
1656         @echo  '  all             - Build all targets marked with [*]'
1657         @echo  '* vmlinux         - Build the bare kernel'
1658         @echo  '* modules         - Build all modules'
1659         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1660         @echo  '  vdso_install    - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1661         @echo  '  dir/            - Build all files in dir and below'
1662         @echo  '  dir/file.[ois]  - Build specified target only'
1663         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1664         @echo  '                    (requires compiler support for LLVM assembly generation)'
1665         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1666         @echo  '                    (requires a recent binutils and recent build (System.map))'
1667         @echo  '  dir/file.ko     - Build module including final link'
1668         @echo  '  modules_prepare - Set up for building external modules'
1669         @echo  '  tags/TAGS       - Generate tags file for editors'
1670         @echo  '  cscope          - Generate cscope index'
1671         @echo  '  gtags           - Generate GNU GLOBAL index'
1672         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1673         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1674         @echo  '  image_name      - Output the image name (use with make -s)'
1675         @echo  '  headers         - Build ready-to-install UAPI headers in usr/include'
1676         @echo  '  headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \
1677          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1678          echo  ''
1679         @echo  'Static analysers:'
1680         @echo  '  checkstack      - Generate a list of stack hogs and consider all functions'
1681         @echo  '                    with a stack size larger than MINSTACKSIZE (default: 100)'
1682         @echo  '  versioncheck    - Sanity check on version.h usage'
1683         @echo  '  includecheck    - Check for duplicate included header files'
1684         @echo  '  headerdep       - Detect inclusion cycles in headers'
1685         @echo  '  coccicheck      - Check with Coccinelle'
1686         @echo  '  clang-analyzer  - Check with clang static analyzer'
1687         @echo  '  clang-tidy      - Check with clang-tidy'
1688         @echo  ''
1689         @echo  'Tools:'
1690         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1691         @echo  ''
1692         @echo  'Kernel selftest:'
1693         @echo  '  kselftest         - Build and run kernel selftest'
1694         @echo  '                      Build, install, and boot kernel before'
1695         @echo  '                      running kselftest on it'
1696         @echo  '                      Run as root for full coverage'
1697         @echo  '  kselftest-all     - Build kernel selftest'
1698         @echo  '  kselftest-install - Build and install kernel selftest'
1699         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1700         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1701         @echo  '                      kselftest to existing .config.'
1702         @echo  ''
1703         @echo  'Rust targets:'
1704         @echo  '  rustavailable   - Checks whether the Rust toolchain is'
1705         @echo  '                    available and, if not, explains why.'
1706         @echo  '  rustfmt         - Reformat all the Rust code in the kernel'
1707         @echo  '  rustfmtcheck    - Checks if all the Rust code in the kernel'
1708         @echo  '                    is formatted, printing a diff otherwise.'
1709         @echo  '  rustdoc         - Generate Rust documentation'
1710         @echo  '                    (requires kernel .config)'
1711         @echo  '  rusttest        - Runs the Rust tests'
1712         @echo  '                    (requires kernel .config; downloads external repos)'
1713         @echo  '  rust-analyzer   - Generate rust-project.json rust-analyzer support file'
1714         @echo  '                    (requires kernel .config)'
1715         @echo  '  dir/file.[os]   - Build specified target only'
1716         @echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1717         @echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1718         @echo  '                    The output is not intended to be compilable.'
1719         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1720         @echo  ''
1721         @$(if $(dtstree), \
1722                 echo 'Devicetree:'; \
1723                 echo '* dtbs               - Build device tree blobs for enabled boards'; \
1724                 echo '  dtbs_install       - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1725                 echo '  dt_binding_check   - Validate device tree binding documents and examples'; \
1726                 echo '  dt_binding_schemas - Build processed device tree binding schemas'; \
1727                 echo '  dtbs_check         - Validate device tree source files';\
1728                 echo '')
1729
1730         @echo 'Userspace tools targets:'
1731         @echo '  use "make tools/help"'
1732         @echo '  or  "cd tools; make help"'
1733         @echo  ''
1734         @echo  'Kernel packaging:'
1735         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1736         @echo  ''
1737         @echo  'Documentation targets:'
1738         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1739         @echo  ''
1740         @echo  'Architecture-specific targets ($(SRCARCH)):'
1741         @$(or $(archhelp),\
1742                 echo '  No architecture-specific help defined for $(SRCARCH)')
1743         @echo  ''
1744         @$(if $(boards), \
1745                 $(foreach b, $(boards), \
1746                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1747                 echo '')
1748         @$(if $(board-dirs), \
1749                 $(foreach b, $(board-dirs), \
1750                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1751                 printf "  %-16s - Show all of the above\\n" help-boards; \
1752                 echo '')
1753
1754         @echo  '  make V=n   [targets] 1: verbose build'
1755         @echo  '                       2: give reason for rebuild of target'
1756         @echo  '                       V=1 and V=2 can be combined with V=12'
1757         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1758         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1759         @echo  '                       (sparse by default)'
1760         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1761         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1762         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3,c,e where'
1763         @echo  '                1: warnings which may be relevant and do not occur too often'
1764         @echo  '                2: warnings which occur quite often but may still be relevant'
1765         @echo  '                3: more obscure warnings, can most likely be ignored'
1766         @echo  '                c: extra checks in the configuration stage (Kconfig)'
1767         @echo  '                e: warnings are being treated as errors'
1768         @echo  '                Multiple levels can be combined with W=12 or W=123'
1769         @$(if $(dtstree), \
1770                 echo '  make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1771                 echo '         This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1772                 )
1773         @echo  ''
1774         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1775         @echo  'For further info see the ./README file'
1776
1777
1778 help-board-dirs := $(addprefix help-,$(board-dirs))
1779
1780 help-boards: $(help-board-dirs)
1781
1782 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1783
1784 $(help-board-dirs): help-%:
1785         @echo  'Architecture-specific targets ($(SRCARCH) $*):'
1786         @$(if $(boards-per-dir), \
1787                 $(foreach b, $(boards-per-dir), \
1788                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1789                 echo '')
1790
1791
1792 # Documentation targets
1793 # ---------------------------------------------------------------------------
1794 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1795                linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1796 PHONY += $(DOC_TARGETS)
1797 $(DOC_TARGETS):
1798         $(Q)$(MAKE) $(build)=Documentation $@
1799
1800
1801 # Rust targets
1802 # ---------------------------------------------------------------------------
1803
1804 # "Is Rust available?" target
1805 PHONY += rustavailable
1806 rustavailable:
1807         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1808
1809 # Documentation target
1810 #
1811 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1812 PHONY += rustdoc
1813 rustdoc: prepare
1814         $(Q)$(MAKE) $(build)=rust $@
1815
1816 # Testing target
1817 PHONY += rusttest
1818 rusttest: prepare
1819         $(Q)$(MAKE) $(build)=rust $@
1820
1821 # Formatting targets
1822 PHONY += rustfmt rustfmtcheck
1823
1824 rustfmt:
1825         $(Q)find $(srctree) $(RCS_FIND_IGNORE) \
1826                 -type f -a -name '*.rs' -a ! -name '*generated*' -print \
1827                 | xargs $(RUSTFMT) $(rustfmt_flags)
1828
1829 rustfmtcheck: rustfmt_flags = --check
1830 rustfmtcheck: rustfmt
1831
1832 # Misc
1833 # ---------------------------------------------------------------------------
1834
1835 PHONY += misc-check
1836 misc-check:
1837         $(Q)$(srctree)/scripts/misc-check
1838
1839 all: misc-check
1840
1841 PHONY += scripts_gdb
1842 scripts_gdb: prepare0
1843         $(Q)$(MAKE) $(build)=scripts/gdb
1844         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1845
1846 ifdef CONFIG_GDB_SCRIPTS
1847 all: scripts_gdb
1848 endif
1849
1850 else # KBUILD_EXTMOD
1851
1852 filechk_kernel.release = echo $(KERNELRELEASE)
1853
1854 ###
1855 # External module support.
1856 # When building external modules the kernel used as basis is considered
1857 # read-only, and no consistency checks are made and the make
1858 # system is not used on the basis kernel. If updates are required
1859 # in the basis kernel ordinary make commands (without M=...) must be used.
1860
1861 # We are always building only modules.
1862 KBUILD_BUILTIN :=
1863 KBUILD_MODULES := y
1864
1865 build-dir := .
1866
1867 clean-dirs := .
1868 clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json
1869
1870 PHONY += prepare
1871 # now expand this into a simple variable to reduce the cost of shell evaluations
1872 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1873 prepare:
1874         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1875                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1876                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1877                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1878         fi
1879
1880 PHONY += help
1881 help:
1882         @echo  '  Building external modules.'
1883         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1884         @echo  ''
1885         @echo  '  modules         - default target, build the module(s)'
1886         @echo  '  modules_install - install the module'
1887         @echo  '  clean           - remove generated files in module directory only'
1888         @echo  '  rust-analyzer   - generate rust-project.json rust-analyzer support file'
1889         @echo  ''
1890
1891 ifndef CONFIG_MODULES
1892 modules modules_install: __external_modules_error
1893 __external_modules_error:
1894         @echo >&2 '***'
1895         @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1896         @echo >&2 '*** You cannot build or install external modules.'
1897         @echo >&2 '***'
1898         @false
1899 endif
1900
1901 endif # KBUILD_EXTMOD
1902
1903 # ---------------------------------------------------------------------------
1904 # Modules
1905
1906 PHONY += modules modules_install modules_sign modules_prepare
1907
1908 modules_install:
1909         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1910         sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1911
1912 ifeq ($(CONFIG_MODULE_SIG),y)
1913 # modules_sign is a subset of modules_install.
1914 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1915 modules_sign: modules_install
1916         @:
1917 else
1918 modules_sign:
1919         @echo >&2 '***'
1920         @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1921         @echo >&2 '***'
1922         @false
1923 endif
1924
1925 ifdef CONFIG_MODULES
1926
1927 modules.order: $(build-dir)
1928         @:
1929
1930 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1931 # This is solely useful to speed up test compiles.
1932 modules: modpost
1933 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1934         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1935 endif
1936
1937 PHONY += modules_check
1938 modules_check: modules.order
1939         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1940
1941 else # CONFIG_MODULES
1942
1943 modules:
1944         @:
1945
1946 KBUILD_MODULES :=
1947
1948 endif # CONFIG_MODULES
1949
1950 PHONY += modpost
1951 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1952          $(if $(KBUILD_MODULES), modules_check)
1953         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1954
1955 # Single targets
1956 # ---------------------------------------------------------------------------
1957 # To build individual files in subdirectories, you can do like this:
1958 #
1959 #   make foo/bar/baz.s
1960 #
1961 # The supported suffixes for single-target are listed in 'single-targets'
1962 #
1963 # To build only under specific subdirectories, you can do like this:
1964 #
1965 #   make foo/bar/baz/
1966
1967 ifdef single-build
1968
1969 # .ko is special because modpost is needed
1970 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1971 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1972                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1973
1974 $(single-ko): single_modules
1975         @:
1976 $(single-no-ko): $(build-dir)
1977         @:
1978
1979 # Remove modules.order when done because it is not the real one.
1980 PHONY += single_modules
1981 single_modules: $(single-no-ko) modules_prepare
1982         $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order
1983         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1984 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1985         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1986 endif
1987         $(Q)rm -f modules.order
1988
1989 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1990
1991 KBUILD_MODULES := y
1992
1993 endif
1994
1995 prepare: outputmakefile
1996
1997 # Preset locale variables to speed up the build process. Limit locale
1998 # tweaks to this spot to avoid wrong language settings when running
1999 # make menuconfig etc.
2000 # Error messages still appears in the original language
2001 PHONY += $(build-dir)
2002 $(build-dir): prepare
2003         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2004
2005 clean-dirs := $(addprefix _clean_, $(clean-dirs))
2006 PHONY += $(clean-dirs) clean
2007 $(clean-dirs):
2008         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2009
2010 clean: $(clean-dirs)
2011         $(call cmd,rmfiles)
2012         @find . $(RCS_FIND_IGNORE) \
2013                 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2014                 -o -name '*.ko.*' \
2015                 -o -name '*.dtb' -o -name '*.dtbo' \
2016                 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
2017                 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
2018                 -o -name '*.dwo' -o -name '*.lst' \
2019                 -o -name '*.su' -o -name '*.mod' \
2020                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2021                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2022                 -o -name '*.asn1.[ch]' \
2023                 -o -name '*.symtypes' -o -name 'modules.order' \
2024                 -o -name '*.c.[012]*.*' \
2025                 -o -name '*.ll' \
2026                 -o -name '*.gcno' \
2027                 \) -type f -print \
2028                 -o -name '.tmp_*' -print \
2029                 | xargs rm -rf
2030
2031 # Generate tags for editors
2032 # ---------------------------------------------------------------------------
2033 quiet_cmd_tags = GEN     $@
2034       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2035
2036 tags TAGS cscope gtags: FORCE
2037         $(call cmd,tags)
2038
2039 # Generate rust-project.json (a file that describes the structure of non-Cargo
2040 # Rust projects) for rust-analyzer (an implementation of the Language Server
2041 # Protocol).
2042 PHONY += rust-analyzer
2043 rust-analyzer:
2044         +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
2045 ifdef KBUILD_EXTMOD
2046 # FIXME: external modules must not descend into a sub-directory of the kernel
2047         $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@
2048 else
2049         $(Q)$(MAKE) $(build)=rust $@
2050 endif
2051
2052 # Script to generate missing namespace dependencies
2053 # ---------------------------------------------------------------------------
2054
2055 PHONY += nsdeps
2056 nsdeps: export KBUILD_NSDEPS=1
2057 nsdeps: modules
2058         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2059
2060 # Clang Tooling
2061 # ---------------------------------------------------------------------------
2062
2063 quiet_cmd_gen_compile_commands = GEN     $@
2064       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2065
2066 compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
2067         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2068         $(if $(CONFIG_MODULES), modules.order) FORCE
2069         $(call if_changed,gen_compile_commands)
2070
2071 targets += compile_commands.json
2072
2073 PHONY += clang-tidy clang-analyzer
2074
2075 ifdef CONFIG_CC_IS_CLANG
2076 quiet_cmd_clang_tools = CHECK   $<
2077       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2078
2079 clang-tidy clang-analyzer: compile_commands.json
2080         $(call cmd,clang_tools)
2081 else
2082 clang-tidy clang-analyzer:
2083         @echo "$@ requires CC=clang" >&2
2084         @false
2085 endif
2086
2087 # Scripts to check various things for consistency
2088 # ---------------------------------------------------------------------------
2089
2090 PHONY += includecheck versioncheck coccicheck
2091
2092 includecheck:
2093         find $(srctree)/* $(RCS_FIND_IGNORE) \
2094                 -name '*.[hcS]' -type f -print | sort \
2095                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2096
2097 versioncheck:
2098         find $(srctree)/* $(RCS_FIND_IGNORE) \
2099                 -name '*.[hcS]' -type f -print | sort \
2100                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2101
2102 coccicheck:
2103         $(Q)$(BASH) $(srctree)/scripts/$@
2104
2105 PHONY += checkstack kernelrelease kernelversion image_name
2106
2107 # UML needs a little special treatment here.  It wants to use the host
2108 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2109 # else wants $(ARCH), including people doing cross-builds, which means
2110 # that $(SUBARCH) doesn't work here.
2111 ifeq ($(ARCH), um)
2112 CHECKSTACK_ARCH := $(SUBARCH)
2113 else
2114 CHECKSTACK_ARCH := $(ARCH)
2115 endif
2116 MINSTACKSIZE    ?= 100
2117 checkstack:
2118         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2119         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2120
2121 kernelrelease:
2122         @$(filechk_kernel.release)
2123
2124 kernelversion:
2125         @echo $(KERNELVERSION)
2126
2127 image_name:
2128         @echo $(KBUILD_IMAGE)
2129
2130 PHONY += run-command
2131 run-command:
2132         $(Q)$(KBUILD_RUN_COMMAND)
2133
2134 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2135       cmd_rmfiles = rm -rf $(rm-files)
2136
2137 # read saved command lines for existing targets
2138 existing-targets := $(wildcard $(sort $(targets)))
2139
2140 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2141
2142 endif # config-build
2143 endif # mixed-build
2144 endif # need-sub-make
2145
2146 PHONY += FORCE
2147 FORCE:
2148
2149 # Declare the contents of the PHONY variable as phony.  We keep that
2150 # information in a variable so we can use it in if_changed and friends.
2151 .PHONY: $(PHONY)