Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 6
   3 PATCHLEVEL = 2
   4 SUBLEVEL = 16
   5 EXTRAVERSION =
   6 NAME = Hurr durr I'ma ninja sloth
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 ifeq ($(filter undefine,$(.FEATURES)),)
  15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
  16 endif
  17
  18 $(if $(filter __%, $(MAKECMDGOALS)), \
  19         $(error targets prefixed with '__' are only for internal use))
  20
  21 # That's our default target when none is given on the command line
  22 PHONY := __all
  23 __all:
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.a targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 ifneq ($(sub_make_done),1)
  42
  43 # Do not use make's built-in rules and variables
  44 # (this increases performance and avoids hard-to-debug behaviour)
  45 MAKEFLAGS += -rR
  46
  47 # Avoid funny character set dependencies
  48 unexport LC_ALL
  49 LC_COLLATE=C
  50 LC_NUMERIC=C
  51 export LC_COLLATE LC_NUMERIC
  52
  53 # Avoid interference with shell env settings
  54 unexport GREP_OPTIONS
  55
  56 # Beautify output
  57 # ---------------------------------------------------------------------------
  58 #
  59 # Normally, we echo the whole command before executing it. By making
  60 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  61 # $(quiet) to choose other forms of output instead, e.g.
  62 #
  63 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  64 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  65 #
  66 # If $(quiet) is empty, the whole command will be printed.
  67 # If it is set to "quiet_", only the short version will be printed.
  68 # If it is set to "silent_", nothing will be printed at all, since
  69 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  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)ln $@ :<
  75 #
  76 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  77 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  78 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
  79 #
  80 # To put more focus on warnings, be less verbose as default
  81 # Use 'make V=1' to see the full commands
  82
  83 ifeq ("$(origin V)", "command line")
  84   KBUILD_VERBOSE = $(V)
  85 endif
  86 ifndef KBUILD_VERBOSE
  87   KBUILD_VERBOSE = 0
  88 endif
  89
  90 ifeq ($(KBUILD_VERBOSE),1)
  91   quiet =
  92   Q =
  93 else
  94   quiet=quiet_
  95   Q = @
  96 endif
  97
  98 # If the user is running make -s (silent mode), suppress echoing of
  99 # commands
 100 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
 101
 102 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
 103 silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
 104 else
 105 silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
 106 endif
 107
 108 ifeq ($(silence),s)
 109 quiet=silent_
 110 KBUILD_VERBOSE = 0
 111 endif
 112
 113 export quiet Q KBUILD_VERBOSE
 114
 115 # Call a source code checker (by default, "sparse") as part of the
 116 # C compilation.
 117 #
 118 # Use 'make C=1' to enable checking of only re-compiled files.
 119 # Use 'make C=2' to enable checking of *all* source files, regardless
 120 # of whether they are re-compiled or not.
 121 #
 122 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 123 # including where to get the "sparse" utility.
 124
 125 ifeq ("$(origin C)", "command line")
 126   KBUILD_CHECKSRC = $(C)
 127 endif
 128 ifndef KBUILD_CHECKSRC
 129   KBUILD_CHECKSRC = 0
 130 endif
 131
 132 export KBUILD_CHECKSRC
 133
 134 # Enable "clippy" (a linter) as part of the Rust compilation.
 135 #
 136 # Use 'make CLIPPY=1' to enable it.
 137 ifeq ("$(origin CLIPPY)", "command line")
 138   KBUILD_CLIPPY := $(CLIPPY)
 139 endif
 140
 141 export KBUILD_CLIPPY
 142
 143 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 144 # directory of external module to build. Setting M= takes precedence.
 145 ifeq ("$(origin M)", "command line")
 146   KBUILD_EXTMOD := $(M)
 147 endif
 148
 149 $(if $(word 2, $(KBUILD_EXTMOD)), \
 150         $(error building multiple external modules is not supported))
 151
 152 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
 153         $(error module directory path cannot contain '$x')))
 154
 155 # Remove trailing slashes
 156 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 157 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 158 endif
 159
 160 export KBUILD_EXTMOD
 161
 162 # Kbuild will save output files in the current working directory.
 163 # This does not need to match to the root of the kernel source tree.
 164 #
 165 # For example, you can do this:
 166 #
 167 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 168 #
 169 # If you want to save output files in a different location, there are
 170 # two syntaxes to specify it.
 171 #
 172 # 1) O=
 173 # Use "make O=dir/to/store/output/files/"
 174 #
 175 # 2) Set KBUILD_OUTPUT
 176 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 177 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 178 #
 179 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 180 # variable.
 181
 182 # Do we want to change the working directory?
 183 ifeq ("$(origin O)", "command line")
 184   KBUILD_OUTPUT := $(O)
 185 endif
 186
 187 ifneq ($(KBUILD_OUTPUT),)
 188 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 189 # expand a shell special character '~'. We use a somewhat tedious way here.
 190 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 191 $(if $(abs_objtree),, \
 192      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 193
 194 # $(realpath ...) resolves symlinks
 195 abs_objtree := $(realpath $(abs_objtree))
 196 else
 197 abs_objtree := $(CURDIR)
 198 endif # ifneq ($(KBUILD_OUTPUT),)
 199
 200 ifeq ($(abs_objtree),$(CURDIR))
 201 # Suppress "Entering directory ..." unless we are changing the work directory.
 202 MAKEFLAGS += --no-print-directory
 203 else
 204 need-sub-make := 1
 205 endif
 206
 207 this-makefile := $(lastword $(MAKEFILE_LIST))
 208 abs_srctree := $(realpath $(dir $(this-makefile)))
 209
 210 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 211 $(error source directory cannot contain spaces or colons)
 212 endif
 213
 214 ifneq ($(abs_srctree),$(abs_objtree))
 215 # Look for make include files relative to root of kernel src
 216 #
 217 # --included-dir is added for backward compatibility, but you should not rely on
 218 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
 219 MAKEFLAGS += --include-dir=$(abs_srctree)
 220 endif
 221
 222 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 223 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 224 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 225 need-sub-make := 1
 226 # Cancel implicit rules for this Makefile.
 227 $(this-makefile): ;
 228 endif
 229
 230 export abs_srctree abs_objtree
 231 export sub_make_done := 1
 232
 233 ifeq ($(need-sub-make),1)
 234
 235 PHONY += $(MAKECMDGOALS) __sub-make
 236
 237 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 238         @:
 239
 240 # Invoke a second make in the output directory, passing relevant variables
 241 __sub-make:
 242         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 243
 244 endif # need-sub-make
 245 endif # sub_make_done
 246
 247 # We process the rest of the Makefile if this is the final invocation of make
 248 ifeq ($(need-sub-make),)
 249
 250 # Do not print "Entering directory ...",
 251 # but we want to display it when entering to the output directory
 252 # so that IDEs/editors are able to understand relative filenames.
 253 MAKEFLAGS += --no-print-directory
 254
 255 ifeq ($(abs_srctree),$(abs_objtree))
 256         # building in the source tree
 257         srctree := .
 258         building_out_of_srctree :=
 259 else
 260         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 261                 # building in a subdirectory of the source tree
 262                 srctree := ..
 263         else
 264                 srctree := $(abs_srctree)
 265         endif
 266         building_out_of_srctree := 1
 267 endif
 268
 269 ifneq ($(KBUILD_ABS_SRCTREE),)
 270 srctree := $(abs_srctree)
 271 endif
 272
 273 objtree         := .
 274 VPATH           := $(srctree)
 275
 276 export building_out_of_srctree srctree objtree VPATH
 277
 278 # To make sure we do not include .config for any of the *config targets
 279 # catch them early, and hand them over to scripts/kconfig/Makefile
 280 # It is allowed to specify more targets when calling make, including
 281 # mixing *config targets and build targets.
 282 # For example 'make oldconfig all'.
 283 # Detect when mixed targets is specified, and make a second invocation
 284 # of make so .config is not included in this case either (for *config).
 285
 286 version_h := include/generated/uapi/linux/version.h
 287
 288 clean-targets := %clean mrproper cleandocs
 289 no-dot-config-targets := $(clean-targets) \
 290                          cscope gtags TAGS tags help% %docs check% coccicheck \
 291                          $(version_h) headers headers_% archheaders archscripts \
 292                          %asm-generic kernelversion %src-pkg dt_binding_check \
 293                          outputmakefile rustavailable rustfmt rustfmtcheck
 294 # Installation targets should not require compiler. Unfortunately, vdso_install
 295 # is an exception where build artifacts may be updated. This must be fixed.
 296 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
 297                         headers_install modules_install kernelrelease image_name
 298 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
 299                           image_name
 300 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
 301
 302 config-build    :=
 303 mixed-build     :=
 304 need-config     := 1
 305 need-compiler   := 1
 306 may-sync-config := 1
 307 single-build    :=
 308
 309 ifneq ($(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-compiler-targets), $(MAKECMDGOALS)),)
 316         ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
 317                 need-compiler :=
 318         endif
 319 endif
 320
 321 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 322         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 323                 may-sync-config :=
 324         endif
 325 endif
 326
 327 ifneq ($(KBUILD_EXTMOD),)
 328         may-sync-config :=
 329 endif
 330
 331 ifeq ($(KBUILD_EXTMOD),)
 332         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 333                 config-build := 1
 334                 ifneq ($(words $(MAKECMDGOALS)),1)
 335                         mixed-build := 1
 336                 endif
 337         endif
 338 endif
 339
 340 # We cannot build single targets and the others at the same time
 341 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 342         single-build := 1
 343         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 344                 mixed-build := 1
 345         endif
 346 endif
 347
 348 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 349 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 350         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 351                 mixed-build := 1
 352         endif
 353 endif
 354
 355 # install and modules_install need also be processed one by one
 356 ifneq ($(filter install,$(MAKECMDGOALS)),)
 357         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 358                 mixed-build := 1
 359         endif
 360 endif
 361
 362 ifdef mixed-build
 363 # ===========================================================================
 364 # We're called with mixed targets (*config and build targets).
 365 # Handle them one by one.
 366
 367 PHONY += $(MAKECMDGOALS) __build_one_by_one
 368
 369 $(MAKECMDGOALS): __build_one_by_one
 370         @:
 371
 372 __build_one_by_one:
 373         $(Q)set -e; \
 374         for i in $(MAKECMDGOALS); do \
 375                 $(MAKE) -f $(srctree)/Makefile $$i; \
 376         done
 377
 378 else # !mixed-build
 379
 380 include $(srctree)/scripts/Kbuild.include
 381
 382 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 383 KERNELRELEASE = $(call read-file, include/config/kernel.release)
 384 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 385 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 386
 387 include $(srctree)/scripts/subarch.include
 388
 389 # Cross compiling and selecting different set of gcc/bin-utils
 390 # ---------------------------------------------------------------------------
 391 #
 392 # When performing cross compilation for other architectures ARCH shall be set
 393 # to the target architecture. (See arch/* for the possibilities).
 394 # ARCH can be set during invocation of make:
 395 # make ARCH=ia64
 396 # Another way is to have ARCH set in the environment.
 397 # The default ARCH is the host where make is executed.
 398
 399 # CROSS_COMPILE specify the prefix used for all executables used
 400 # during compilation. Only gcc and related bin-utils executables
 401 # are prefixed with $(CROSS_COMPILE).
 402 # CROSS_COMPILE can be set on the command line
 403 # make CROSS_COMPILE=ia64-linux-
 404 # Alternatively CROSS_COMPILE can be set in the environment.
 405 # Default value for CROSS_COMPILE is not to prefix executables
 406 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 407 ARCH            ?= $(SUBARCH)
 408
 409 # Architecture as present in compile.h
 410 UTS_MACHINE     := $(ARCH)
 411 SRCARCH         := $(ARCH)
 412
 413 # Additional ARCH settings for x86
 414 ifeq ($(ARCH),i386)
 415         SRCARCH := x86
 416 endif
 417 ifeq ($(ARCH),x86_64)
 418         SRCARCH := x86
 419 endif
 420
 421 # Additional ARCH settings for sparc
 422 ifeq ($(ARCH),sparc32)
 423        SRCARCH := sparc
 424 endif
 425 ifeq ($(ARCH),sparc64)
 426        SRCARCH := sparc
 427 endif
 428
 429 # Additional ARCH settings for parisc
 430 ifeq ($(ARCH),parisc64)
 431        SRCARCH := parisc
 432 endif
 433
 434 export cross_compiling :=
 435 ifneq ($(SRCARCH),$(SUBARCH))
 436 cross_compiling := 1
 437 endif
 438
 439 KCONFIG_CONFIG  ?= .config
 440 export KCONFIG_CONFIG
 441
 442 # SHELL used by kbuild
 443 CONFIG_SHELL := sh
 444
 445 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 446 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 447 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 448
 449 ifneq ($(LLVM),)
 450 ifneq ($(filter %/,$(LLVM)),)
 451 LLVM_PREFIX := $(LLVM)
 452 else ifneq ($(filter -%,$(LLVM)),)
 453 LLVM_SUFFIX := $(LLVM)
 454 endif
 455
 456 HOSTCC  = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 457 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 458 else
 459 HOSTCC  = gcc
 460 HOSTCXX = g++
 461 endif
 462 HOSTRUSTC = rustc
 463 HOSTPKG_CONFIG  = pkg-config
 464
 465 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 466                          -O2 -fomit-frame-pointer -std=gnu11 \
 467                          -Wdeclaration-after-statement
 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                             -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
 476                             -Dunreachable_pub -Dnon_ascii_idents \
 477                             -Wmissing_docs \
 478                             -Drustdoc::missing_crate_level_docs \
 479                             -Dclippy::correctness -Dclippy::style \
 480                             -Dclippy::suspicious -Dclippy::complexity \
 481                             -Dclippy::perf \
 482                             -Dclippy::let_unit_value -Dclippy::mut_mut \
 483                             -Dclippy::needless_bitwise_bool \
 484                             -Dclippy::needless_continue \
 485                             -Wclippy::dbg_macro
 486
 487 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 488 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 489 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 490                         -Zallow-features= $(HOSTRUSTFLAGS)
 491 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 492 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 493
 494 # Make variables (CC, etc...)
 495 CPP             = $(CC) -E
 496 ifneq ($(LLVM),)
 497 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 498 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 499 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 500 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 501 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 502 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 503 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 504 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 505 else
 506 CC              = $(CROSS_COMPILE)gcc
 507 LD              = $(CROSS_COMPILE)ld
 508 AR              = $(CROSS_COMPILE)ar
 509 NM              = $(CROSS_COMPILE)nm
 510 OBJCOPY         = $(CROSS_COMPILE)objcopy
 511 OBJDUMP         = $(CROSS_COMPILE)objdump
 512 READELF         = $(CROSS_COMPILE)readelf
 513 STRIP           = $(CROSS_COMPILE)strip
 514 endif
 515 RUSTC           = rustc
 516 RUSTDOC         = rustdoc
 517 RUSTFMT         = rustfmt
 518 CLIPPY_DRIVER   = clippy-driver
 519 BINDGEN         = bindgen
 520 CARGO           = cargo
 521 PAHOLE          = pahole
 522 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 523 LEX             = flex
 524 YACC            = bison
 525 AWK             = awk
 526 INSTALLKERNEL  := installkernel
 527 DEPMOD          = depmod
 528 PERL            = perl
 529 PYTHON3         = python3
 530 CHECK           = sparse
 531 BASH            = bash
 532 KGZIP           = gzip
 533 KBZIP2          = bzip2
 534 KLZOP           = lzop
 535 LZMA            = lzma
 536 LZ4             = lz4c
 537 XZ              = xz
 538 ZSTD            = zstd
 539
 540 PAHOLE_FLAGS    = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
 541
 542 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 543                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 544 NOSTDINC_FLAGS :=
 545 CFLAGS_MODULE   =
 546 RUSTFLAGS_MODULE =
 547 AFLAGS_MODULE   =
 548 LDFLAGS_MODULE  =
 549 CFLAGS_KERNEL   =
 550 RUSTFLAGS_KERNEL =
 551 AFLAGS_KERNEL   =
 552 LDFLAGS_vmlinux =
 553
 554 # Use USERINCLUDE when you must reference the UAPI directories only.
 555 USERINCLUDE    := \
 556                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 557                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 558                 -I$(srctree)/include/uapi \
 559                 -I$(objtree)/include/generated/uapi \
 560                 -include $(srctree)/include/linux/compiler-version.h \
 561                 -include $(srctree)/include/linux/kconfig.h
 562
 563 # Use LINUXINCLUDE when you must reference the include/ directory.
 564 # Needed to be compatible with the O= option
 565 LINUXINCLUDE    := \
 566                 -I$(srctree)/arch/$(SRCARCH)/include \
 567                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 568                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 569                 -I$(objtree)/include \
 570                 $(USERINCLUDE)
 571
 572 # UBUNTU: Include our third party driver stuff too
 573 LINUXINCLUDE   += -I$(srctree)/ubuntu/include
 574
 575 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 576 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 577                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 578                    -Werror=implicit-function-declaration -Werror=implicit-int \
 579                    -Werror=return-type -Wno-format-security -funsigned-char \
 580                    -std=gnu11
 581 KBUILD_CPPFLAGS := -D__KERNEL__
 582 KBUILD_RUSTFLAGS := $(rust_common_flags) \
 583                     --target=$(objtree)/rust/target.json \
 584                     -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 585                     -Cforce-unwind-tables=n -Ccodegen-units=1 \
 586                     -Csymbol-mangling-version=v0 \
 587                     -Crelocation-model=static \
 588                     -Zfunction-sections=n \
 589                     -Dclippy::float_arithmetic
 590
 591 KBUILD_AFLAGS_KERNEL :=
 592 KBUILD_CFLAGS_KERNEL :=
 593 KBUILD_RUSTFLAGS_KERNEL :=
 594 KBUILD_AFLAGS_MODULE  := -DMODULE
 595 KBUILD_CFLAGS_MODULE  := -DMODULE
 596 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 597 KBUILD_LDFLAGS_MODULE :=
 598 KBUILD_LDFLAGS :=
 599 CLANG_FLAGS :=
 600
 601 ifeq ($(KBUILD_CLIPPY),1)
 602         RUSTC_OR_CLIPPY_QUIET := CLIPPY
 603         RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 604 else
 605         RUSTC_OR_CLIPPY_QUIET := RUSTC
 606         RUSTC_OR_CLIPPY = $(RUSTC)
 607 endif
 608
 609 ifdef RUST_LIB_SRC
 610         export RUST_LIB_SRC
 611 endif
 612
 613 # Allows the usage of unstable features in stable compilers.
 614 export RUSTC_BOOTSTRAP := 1
 615
 616 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 617 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
 618 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 619 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 620 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 621 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 622 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 623 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 624
 625 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 626 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 627 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 628 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 629 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 630 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 631 export PAHOLE_FLAGS
 632
 633 # Files to ignore in find ... statements
 634
 635 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 636                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 637                           -prune -o
 638 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 639                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 640
 641 # ===========================================================================
 642 # Rules shared between *config targets and build targets
 643
 644 # Basic helpers built in scripts/basic/
 645 PHONY += scripts_basic
 646 scripts_basic:
 647         $(Q)$(MAKE) $(build)=scripts/basic
 648
 649 PHONY += outputmakefile
 650 ifdef building_out_of_srctree
 651 # Before starting out-of-tree build, make sure the source tree is clean.
 652 # outputmakefile generates a Makefile in the output directory, if using a
 653 # separate output directory. This allows convenient use of make in the
 654 # output directory.
 655 # At the same time when output Makefile generated, generate .gitignore to
 656 # ignore whole output directory
 657
 658 quiet_cmd_makefile = GEN     Makefile
 659       cmd_makefile = { \
 660         echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 661         echo "include $(srctree)/Makefile"; \
 662         } > Makefile
 663
 664 outputmakefile:
 665         @if [ -f $(srctree)/.config -o \
 666                  -d $(srctree)/include/config -o \
 667                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 668                 echo >&2 "***"; \
 669                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 670                 echo >&2 "*** in $(abs_srctree)";\
 671                 echo >&2 "***"; \
 672                 false; \
 673         fi
 674         $(Q)ln -fsn $(srctree) source
 675         $(call cmd,makefile)
 676         $(Q)test -e .gitignore || \
 677         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 678 endif
 679
 680 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 681 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 682 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 683 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 684 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 685
 686 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 687 include $(srctree)/scripts/Makefile.clang
 688 endif
 689
 690 # Include this also for config targets because some architectures need
 691 # cc-cross-prefix to determine CROSS_COMPILE.
 692 ifdef need-compiler
 693 include $(srctree)/scripts/Makefile.compiler
 694 endif
 695
 696 ifdef config-build
 697 # ===========================================================================
 698 # *config targets only - make sure prerequisites are updated, and descend
 699 # in scripts/kconfig to make the *config target
 700
 701 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 702 # KBUILD_DEFCONFIG may point out an alternative default configuration
 703 # used for 'make defconfig'
 704 include $(srctree)/arch/$(SRCARCH)/Makefile
 705 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 706
 707 config: outputmakefile scripts_basic FORCE
 708         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 709
 710 %config: outputmakefile scripts_basic FORCE
 711         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 712
 713 else #!config-build
 714 # ===========================================================================
 715 # Build targets only - this includes vmlinux, arch specific targets, clean
 716 # targets and others. In general all targets except *config targets.
 717
 718 # If building an external module we do not care about the all: rule
 719 # but instead __all depend on modules
 720 PHONY += all
 721 ifeq ($(KBUILD_EXTMOD),)
 722 __all: all
 723 else
 724 __all: modules
 725 endif
 726
 727 targets :=
 728
 729 # Decide whether to build built-in, modular, or both.
 730 # Normally, just do built-in.
 731
 732 KBUILD_MODULES :=
 733 KBUILD_BUILTIN := 1
 734
 735 # If we have only "make modules", don't compile built-in objects.
 736 ifeq ($(MAKECMDGOALS),modules)
 737   KBUILD_BUILTIN :=
 738 endif
 739
 740 # If we have "make <whatever> modules", compile modules
 741 # in addition to whatever we do anyway.
 742 # Just "make" or "make all" shall build modules as well
 743
 744 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 745   KBUILD_MODULES := 1
 746 endif
 747
 748 ifeq ($(MAKECMDGOALS),)
 749   KBUILD_MODULES := 1
 750 endif
 751
 752 export KBUILD_MODULES KBUILD_BUILTIN
 753
 754 ifdef need-config
 755 include include/config/auto.conf
 756 endif
 757
 758 ifeq ($(KBUILD_EXTMOD),)
 759 # Objects we will link into vmlinux / subdirs we need to visit
 760 core-y          :=
 761 drivers-y       :=
 762 libs-y          := lib/
 763 endif # KBUILD_EXTMOD
 764
 765 # The all: target is the default when no target is given on the
 766 # command line.
 767 # This allow a user to issue only 'make' to build a kernel including modules
 768 # Defaults to vmlinux, but the arch makefile usually adds further targets
 769 all: vmlinux
 770
 771 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 772 ifdef CONFIG_CC_IS_GCC
 773 CFLAGS_GCOV     += -fno-tree-loop-im
 774 endif
 775 export CFLAGS_GCOV
 776
 777 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 778 ifdef CONFIG_FUNCTION_TRACER
 779   CC_FLAGS_FTRACE := -pg
 780 endif
 781
 782 include $(srctree)/arch/$(SRCARCH)/Makefile
 783
 784 ifdef need-config
 785 ifdef may-sync-config
 786 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 787 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 788 # because some architectures define CROSS_COMPILE there.
 789 include include/config/auto.conf.cmd
 790
 791 $(KCONFIG_CONFIG):
 792         @echo >&2 '***'
 793         @echo >&2 '*** Configuration file "$@" not found!'
 794         @echo >&2 '***'
 795         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 796         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 797         @echo >&2 '***'
 798         @/bin/false
 799
 800 # The actual configuration files used during the build are stored in
 801 # include/generated/ and include/config/. Update them if .config is newer than
 802 # include/config/auto.conf (which mirrors .config).
 803 #
 804 # This exploits the 'multi-target pattern rule' trick.
 805 # The syncconfig should be executed only once to make all the targets.
 806 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 807 #
 808 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 809 # so you cannot notice that Kconfig is waiting for the user input.
 810 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 811         $(Q)$(kecho) "  SYNC    $@"
 812         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 813 else # !may-sync-config
 814 # External modules and some install targets need include/generated/autoconf.h
 815 # and include/config/auto.conf but do not care if they are up-to-date.
 816 # Use auto.conf to trigger the test
 817 PHONY += include/config/auto.conf
 818
 819 include/config/auto.conf:
 820         @test -e include/generated/autoconf.h -a -e $@ || (             \
 821         echo >&2;                                                       \
 822         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 823         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 824         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 825         echo >&2 ;                                                      \
 826         /bin/false)
 827
 828 endif # may-sync-config
 829 endif # need-config
 830
 831 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 832 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 833 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 834 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 835 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 836
 837 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 838 KBUILD_CFLAGS += -O2
 839 KBUILD_RUSTFLAGS += -Copt-level=2
 840 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 841 KBUILD_CFLAGS += -Os
 842 KBUILD_RUSTFLAGS += -Copt-level=s
 843 endif
 844
 845 # Always set `debug-assertions` and `overflow-checks` because their default
 846 # depends on `opt-level` and `debug-assertions`, respectively.
 847 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 848 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 849
 850 # Tell gcc to never replace conditional load with a non-conditional one
 851 ifdef CONFIG_CC_IS_GCC
 852 # gcc-10 renamed --param=allow-store-data-races=0 to
 853 # -fno-allow-store-data-races.
 854 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 855 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 856 endif
 857
 858 ifdef CONFIG_READABLE_ASM
 859 # Disable optimizations that make assembler listings hard to read.
 860 # reorder blocks reorders the control in the function
 861 # ipa clone creates specialized cloned functions
 862 # partial inlining inlines only parts of functions
 863 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 864 endif
 865
 866 ifneq ($(CONFIG_FRAME_WARN),0)
 867 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 868 endif
 869
 870 stackp-flags-y                                    := -fno-stack-protector
 871 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 872 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 873
 874 KBUILD_CFLAGS += $(stackp-flags-y)
 875
 876 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
 877 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
 878 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
 879
 880 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 881 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 882
 883 ifdef CONFIG_CC_IS_CLANG
 884 KBUILD_CPPFLAGS += -Qunused-arguments
 885 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
 886 KBUILD_CFLAGS += -Wno-gnu
 887 else
 888
 889 # gcc inanely warns about local variables called 'main'
 890 KBUILD_CFLAGS += -Wno-main
 891 endif
 892
 893 # These warnings generated too much noise in a regular build.
 894 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 895 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 896 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 897
 898 # These result in bogus false positives
 899 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
 900
 901 ifdef CONFIG_FRAME_POINTER
 902 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 903 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 904 else
 905 # Some targets (ARM with Thumb2, for example), can't be built with frame
 906 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 907 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 908 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 909 # -fomit-frame-pointer with FUNCTION_TRACER.
 910 # In the Rust target specification, "frame-pointer" is set explicitly
 911 # to "may-omit".
 912 ifndef CONFIG_FUNCTION_TRACER
 913 KBUILD_CFLAGS   += -fomit-frame-pointer
 914 endif
 915 endif
 916
 917 # Initialize all stack variables with a 0xAA pattern.
 918 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 919 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 920 endif
 921
 922 # Initialize all stack variables with a zero value.
 923 ifdef CONFIG_INIT_STACK_ALL_ZERO
 924 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 925 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 926 # https://github.com/llvm/llvm-project/issues/44842
 927 KBUILD_CFLAGS   += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 928 endif
 929 endif
 930
 931 # While VLAs have been removed, GCC produces unreachable stack probes
 932 # for the randomize_kstack_offset feature. Disable it for all compilers.
 933 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 934
 935 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 936 ifdef CONFIG_ZERO_CALL_USED_REGS
 937 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 938 endif
 939
 940 ifdef CONFIG_FUNCTION_TRACER
 941 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 942   CC_FLAGS_FTRACE       += -mrecord-mcount
 943   ifdef CONFIG_HAVE_NOP_MCOUNT
 944     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 945       CC_FLAGS_FTRACE   += -mnop-mcount
 946       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 947     endif
 948   endif
 949 endif
 950 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 951   ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
 952     CC_FLAGS_USING      += -DCC_USING_NOP_MCOUNT
 953   endif
 954 endif
 955 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 956   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 957     BUILD_C_RECORDMCOUNT := y
 958     export BUILD_C_RECORDMCOUNT
 959   endif
 960 endif
 961 ifdef CONFIG_HAVE_FENTRY
 962   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 963   ifeq ($(call cc-option-yn, -mfentry),y)
 964     CC_FLAGS_FTRACE     += -mfentry
 965     CC_FLAGS_USING      += -DCC_USING_FENTRY
 966   endif
 967 endif
 968 export CC_FLAGS_FTRACE
 969 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 970 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 971 endif
 972
 973 # We trigger additional mismatches with less inlining
 974 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 975 KBUILD_CFLAGS += -fno-inline-functions-called-once
 976 endif
 977
 978 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 979 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 980 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 981 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 982 LDFLAGS_vmlinux += --gc-sections
 983 endif
 984
 985 ifdef CONFIG_SHADOW_CALL_STACK
 986 ifndef CONFIG_DYNAMIC_SCS
 987 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 988 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 989 endif
 990 export CC_FLAGS_SCS
 991 endif
 992
 993 ifdef CONFIG_LTO_CLANG
 994 ifdef CONFIG_LTO_CLANG_THIN
 995 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 996 KBUILD_LDFLAGS  += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 997 else
 998 CC_FLAGS_LTO    := -flto
 999 endif
1000 CC_FLAGS_LTO    += -fvisibility=hidden
1001
1002 # Limit inlining across translation units to reduce binary size
1003 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
1004
1005 # Check for frame size exceeding threshold during prolog/epilog insertion
1006 # when using lld < 13.0.0.
1007 ifneq ($(CONFIG_FRAME_WARN),0)
1008 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
1009 KBUILD_LDFLAGS  += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
1010 endif
1011 endif
1012 endif
1013
1014 ifdef CONFIG_LTO
1015 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
1016 KBUILD_AFLAGS   += -fno-lto
1017 export CC_FLAGS_LTO
1018 endif
1019
1020 ifdef CONFIG_CFI_CLANG
1021 CC_FLAGS_CFI    := -fsanitize=kcfi
1022 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
1023 export CC_FLAGS_CFI
1024 endif
1025
1026 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1027 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1028 endif
1029
1030 # arch Makefile may override CC so keep this after arch Makefile is included
1031 NOSTDINC_FLAGS += -nostdinc
1032
1033 # warn about C99 declaration after statement
1034 KBUILD_CFLAGS += -Wdeclaration-after-statement
1035
1036 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1037 KBUILD_CFLAGS += -Wvla
1038
1039 # disable pointer signed / unsigned warnings in gcc 4.0
1040 KBUILD_CFLAGS += -Wno-pointer-sign
1041
1042 # In order to make sure new function cast mismatches are not introduced
1043 # in the kernel (to avoid tripping CFI checking), the kernel should be
1044 # globally built with -Wcast-function-type.
1045 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
1046
1047 # disable stringop warnings in gcc 8+
1048 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1049
1050 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1051 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1052
1053 # Another good warning that we'll want to enable eventually
1054 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1055
1056 # Enabled with W=2, disabled by default as noisy
1057 ifdef CONFIG_CC_IS_GCC
1058 KBUILD_CFLAGS += -Wno-maybe-uninitialized
1059 endif
1060
1061 # The allocators already balk at large sizes, so silence the compiler
1062 # warnings for bounds checks involving those possible values. While
1063 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1064 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1065 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1066 # doesn't work (as it is documented to), silently resolving to "0" prior to
1067 # version 9.1 (and producing an error more recently). Numeric values larger
1068 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1069 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1070 # choice, we must perform a versioned check to disable this warning.
1071 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1072 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
1073 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
1074
1075 # disable invalid "can't wrap" optimizations for signed / pointers
1076 KBUILD_CFLAGS   += -fno-strict-overflow
1077
1078 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1079 KBUILD_CFLAGS  += -fno-stack-check
1080
1081 # conserve stack if available
1082 ifdef CONFIG_CC_IS_GCC
1083 KBUILD_CFLAGS   += -fconserve-stack
1084 endif
1085
1086 # Prohibit date/time macros, which would make the build non-deterministic
1087 KBUILD_CFLAGS   += -Werror=date-time
1088
1089 # enforce correct pointer usage
1090 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
1091
1092 # Require designated initializers for all marked structures
1093 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
1094
1095 # change __FILE__ to the relative path from the srctree
1096 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1097
1098 # include additional Makefiles when needed
1099 include-y                       := scripts/Makefile.extrawarn
1100 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1101 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1102 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1103 include-$(CONFIG_KMSAN)         += scripts/Makefile.kmsan
1104 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1105 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1106 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1107 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1108
1109 include $(addprefix $(srctree)/, $(include-y))
1110
1111 # scripts/Makefile.gcc-plugins is intentionally included last.
1112 # Do not add $(call cc-option,...) below this line. When you build the kernel
1113 # from the clean source tree, the GCC plugins do not exist at this point.
1114
1115 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1116 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1117 KBUILD_AFLAGS   += $(KAFLAGS)
1118 KBUILD_CFLAGS   += $(KCFLAGS)
1119 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1120
1121 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1122 LDFLAGS_vmlinux += --build-id=sha1
1123
1124 KBUILD_LDFLAGS  += -z noexecstack
1125 ifeq ($(CONFIG_LD_IS_BFD),y)
1126 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
1127 endif
1128
1129 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1130 LDFLAGS_vmlinux += -X
1131 endif
1132
1133 ifeq ($(CONFIG_RELR),y)
1134 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1135 endif
1136
1137 # We never want expected sections to be placed heuristically by the
1138 # linker. All sections should be explicitly named in the linker script.
1139 ifdef CONFIG_LD_ORPHAN_WARN
1140 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1141 endif
1142
1143 # Align the bit size of userspace programs with the kernel
1144 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1145 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1146
1147 # make the checker run with the right architecture
1148 CHECKFLAGS += --arch=$(ARCH)
1149
1150 # insure the checker run with the right endianness
1151 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1152
1153 # the checker needs the correct machine size
1154 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1155
1156 # Default kernel image to build when no specific target is given.
1157 # KBUILD_IMAGE may be overruled on the command line or
1158 # set in the environment
1159 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1160 # this default value
1161 export KBUILD_IMAGE ?= vmlinux
1162
1163 #
1164 # INSTALL_PATH specifies where to place the updated kernel and system map
1165 # images. Default is /boot, but you can set it to other values
1166 export  INSTALL_PATH ?= /boot
1167
1168 #
1169 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1170 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1171 # an argument if needed. Otherwise it defaults to the kernel install path
1172 #
1173 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1174
1175 #
1176 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1177 # relocations required by build roots.  This is not defined in the
1178 # makefile but the argument can be passed to make if needed.
1179 #
1180
1181 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1182 export MODLIB
1183
1184 PHONY += prepare0
1185
1186 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1187 export MODORDER := $(extmod_prefix)modules.order
1188 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1189
1190 ifeq ($(KBUILD_EXTMOD),)
1191
1192 build-dir       := .
1193 clean-dirs      := $(sort . Documentation \
1194                      $(patsubst %/,%,$(filter %/, $(core-) \
1195                         $(drivers-) $(libs-))))
1196
1197 export ARCH_CORE        := $(core-y)
1198 export ARCH_LIB         := $(filter %/, $(libs-y))
1199 export ARCH_DRIVERS     := $(drivers-y) $(drivers-m)
1200 # Externally visible symbols (used by link-vmlinux.sh)
1201
1202 KBUILD_VMLINUX_OBJS := ./built-in.a
1203 ifdef CONFIG_MODULES
1204 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1205 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1206 else
1207 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1208 endif
1209
1210 export KBUILD_VMLINUX_LIBS
1211 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1212
1213 # Recurse until adjust_autoksyms.sh is satisfied
1214 PHONY += autoksyms_recursive
1215 ifdef CONFIG_TRIM_UNUSED_KSYMS
1216 # For the kernel to actually contain only the needed exported symbols,
1217 # we have to build modules as well to determine what those symbols are.
1218 # (this can be evaluated only once include/config/auto.conf has been included)
1219 KBUILD_MODULES := 1
1220
1221 autoksyms_recursive: $(build-dir) modules.order
1222         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1223           "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1224 endif
1225
1226 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1227
1228 quiet_cmd_autoksyms_h = GEN     $@
1229       cmd_autoksyms_h = mkdir -p $(dir $@); \
1230                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1231
1232 $(autoksyms_h):
1233         $(call cmd,autoksyms_h)
1234
1235 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1236 quiet_cmd_ar_vmlinux.a = AR      $@
1237       cmd_ar_vmlinux.a = \
1238         rm -f $@; \
1239         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1240         $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1241
1242 targets += vmlinux.a
1243 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
1244         $(call if_changed,ar_vmlinux.a)
1245
1246 PHONY += vmlinux_o
1247 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1248         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1249
1250 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1251         @:
1252
1253 PHONY += vmlinux
1254 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1255 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1256 # unrelated; the decompressors just happen to have the same base name,
1257 # arch/*/boot/compressed/vmlinux.
1258 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1259 #
1260 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1261 #   https://savannah.gnu.org/bugs/?61463
1262 # For Make > 4.4, the following simple code will work:
1263 #  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1264 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1265 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1266 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1267         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1268
1269 # The actual objects are generated when descending,
1270 # make sure no implicit rule kicks in
1271 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1272
1273 filechk_kernel.release = \
1274         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1275
1276 # Store (new) KERNELRELEASE string in include/config/kernel.release
1277 include/config/kernel.release: FORCE
1278         $(call filechk,kernel.release)
1279
1280 # Additional helpers built in scripts/
1281 # Carefully list dependencies so we do not try to build scripts twice
1282 # in parallel
1283 PHONY += scripts
1284 scripts: scripts_basic scripts_dtc
1285         $(Q)$(MAKE) $(build)=$(@)
1286
1287 # Things we need to do before we recursively start building the kernel
1288 # or the modules are listed in "prepare".
1289 # A multi level approach is used. prepareN is processed before prepareN-1.
1290 # archprepare is used in arch Makefiles and when processed asm symlink,
1291 # version.h and scripts_basic is processed / created.
1292
1293 PHONY += prepare archprepare
1294
1295 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1296         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1297         include/generated/compile.h include/generated/autoconf.h remove-stale-files
1298
1299 prepare0: archprepare
1300         $(Q)$(MAKE) $(build)=scripts/mod
1301         $(Q)$(MAKE) $(build)=. prepare
1302
1303 # All the preparing..
1304 prepare: prepare0
1305 ifdef CONFIG_RUST
1306         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v
1307         $(Q)$(MAKE) $(build)=rust
1308 endif
1309
1310 PHONY += remove-stale-files
1311 remove-stale-files:
1312         $(Q)$(srctree)/scripts/remove-stale-files
1313
1314 # Support for using generic headers in asm-generic
1315 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1316
1317 PHONY += asm-generic uapi-asm-generic
1318 asm-generic: uapi-asm-generic
1319         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1320         generic=include/asm-generic
1321 uapi-asm-generic:
1322         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1323         generic=include/uapi/asm-generic
1324
1325 # Generate some files
1326 # ---------------------------------------------------------------------------
1327
1328 # KERNELRELEASE can change from a few different places, meaning version.h
1329 # needs to be updated, so this check is forced on all builds
1330
1331 uts_len := 64
1332 define filechk_utsrelease.h
1333         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1334           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1335           exit 1;                                                         \
1336         fi;                                                               \
1337         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1338 endef
1339
1340 define filechk_version.h
1341         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1342                 echo \#define LINUX_VERSION_CODE $(shell                 \
1343                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1344         else                                                             \
1345                 echo \#define LINUX_VERSION_CODE $(shell                 \
1346                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1347         fi;                                                              \
1348         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1349         ((c) > 255 ? 255 : (c)))';                                       \
1350         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1351         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1352         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1353 endef
1354
1355 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1356 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1357 $(version_h): FORCE
1358         $(call filechk,version.h)
1359
1360 include/generated/utsrelease.h: include/config/kernel.release FORCE
1361         $(call filechk,utsrelease.h)
1362
1363 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1364         "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1365
1366 include/generated/compile.h: FORCE
1367         $(call filechk,compile.h)
1368
1369 PHONY += headerdep
1370 headerdep:
1371         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1372         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1373
1374 # ---------------------------------------------------------------------------
1375 # Kernel headers
1376
1377 #Default location for installed headers
1378 export INSTALL_HDR_PATH = $(objtree)/usr
1379
1380 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1381       cmd_headers_install = \
1382         mkdir -p $(INSTALL_HDR_PATH); \
1383         find usr/include -type f -name '*.h' -print0 | \
1384         tar -czf - --null --no-recursion --no-wildcards-match-slash -T- | \
1385         tar -xzf - --strip-components=1 -C $(INSTALL_HDR_PATH)
1386
1387 PHONY += headers_install
1388 headers_install: headers
1389         $(call cmd,headers_install)
1390
1391 PHONY += archheaders archscripts
1392
1393 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1394
1395 PHONY += headers
1396 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1397         $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1398         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1399         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1400         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1401
1402 ifdef CONFIG_HEADERS_INSTALL
1403 prepare: headers
1404 endif
1405
1406 PHONY += scripts_unifdef
1407 scripts_unifdef: scripts_basic
1408         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1409
1410 # ---------------------------------------------------------------------------
1411 # Install
1412
1413 # Many distributions have the custom install script, /sbin/installkernel.
1414 # If DKMS is installed, 'make install' will eventually recurse back
1415 # to this Makefile to build and install external modules.
1416 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1417
1418 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1419       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1420
1421 # ---------------------------------------------------------------------------
1422 # Tools
1423
1424 ifdef CONFIG_OBJTOOL
1425 prepare: tools/objtool
1426 endif
1427
1428 ifdef CONFIG_BPF
1429 ifdef CONFIG_DEBUG_INFO_BTF
1430 prepare: tools/bpf/resolve_btfids
1431 endif
1432 endif
1433
1434 PHONY += resolve_btfids_clean
1435
1436 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1437
1438 # tools/bpf/resolve_btfids directory might not exist
1439 # in output directory, skip its clean in that case
1440 resolve_btfids_clean:
1441 ifneq ($(wildcard $(resolve_btfids_O)),)
1442         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1443 endif
1444
1445 # Clear a bunch of variables before executing the submake
1446 ifeq ($(quiet),silent_)
1447 tools_silent=s
1448 endif
1449
1450 tools/: FORCE
1451         $(Q)mkdir -p $(objtree)/tools
1452         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1453
1454 tools/%: FORCE
1455         $(Q)mkdir -p $(objtree)/tools
1456         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1457
1458 # ---------------------------------------------------------------------------
1459 # Kernel selftest
1460
1461 PHONY += kselftest
1462 kselftest: headers
1463         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1464
1465 kselftest-%: headers FORCE
1466         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1467
1468 PHONY += kselftest-merge
1469 kselftest-merge:
1470         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1471         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1472                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1473         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1474
1475 # ---------------------------------------------------------------------------
1476 # Devicetree files
1477
1478 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1479 dtstree := arch/$(SRCARCH)/boot/dts
1480 endif
1481
1482 ifneq ($(dtstree),)
1483
1484 %.dtb: dtbs_prepare
1485         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1486
1487 %.dtbo: dtbs_prepare
1488         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1489
1490 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1491 dtbs: dtbs_prepare
1492         $(Q)$(MAKE) $(build)=$(dtstree)
1493
1494 # include/config/kernel.release is actually needed when installing DTBs because
1495 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1496 # dtbs_install depend on it as dtbs_install may run as root.
1497 dtbs_prepare: include/config/kernel.release scripts_dtc
1498
1499 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1500 export CHECK_DTBS=y
1501 dtbs: dt_binding_check
1502 endif
1503
1504 dtbs_check: dtbs
1505
1506 dtbs_install:
1507         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1508
1509 ifdef CONFIG_OF_EARLY_FLATTREE
1510 all: dtbs
1511 endif
1512
1513 endif
1514
1515 PHONY += scripts_dtc
1516 scripts_dtc: scripts_basic
1517         $(Q)$(MAKE) $(build)=scripts/dtc
1518
1519 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1520 export CHECK_DT_BINDING=y
1521 endif
1522
1523 PHONY += dt_binding_check
1524 dt_binding_check: scripts_dtc
1525         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1526
1527 PHONY += dt_compatible_check
1528 dt_compatible_check: dt_binding_check
1529         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1530
1531 # ---------------------------------------------------------------------------
1532 # Modules
1533
1534 ifdef CONFIG_MODULES
1535
1536 # By default, build modules as well
1537
1538 all: modules
1539
1540 # When we're building modules with modversions, we need to consider
1541 # the built-in objects during the descend as well, in order to
1542 # make sure the checksums are up to date before we record them.
1543 ifdef CONFIG_MODVERSIONS
1544   KBUILD_BUILTIN := 1
1545 endif
1546
1547 # Build modules
1548 #
1549
1550 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
1551 # is an exception.
1552 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1553 KBUILD_BUILTIN := 1
1554 modules: vmlinux
1555 endif
1556
1557 modules: modules_prepare
1558
1559 # Target to prepare building external modules
1560 modules_prepare: prepare
1561         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1562
1563 export modules_sign_only :=
1564
1565 ifeq ($(CONFIG_MODULE_SIG),y)
1566 PHONY += modules_sign
1567 modules_sign: modules_install
1568         @:
1569
1570 # modules_sign is a subset of modules_install.
1571 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1572 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1573 modules_sign_only := y
1574 endif
1575 endif
1576
1577 modinst_pre :=
1578 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1579 modinst_pre := __modinst_pre
1580 endif
1581
1582 modules_install: $(modinst_pre)
1583 PHONY += __modinst_pre
1584 __modinst_pre:
1585         @rm -rf $(MODLIB)/kernel
1586         @rm -f $(MODLIB)/source
1587         @mkdir -p $(MODLIB)/kernel
1588         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1589         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1590                 rm -f $(MODLIB)/build ; \
1591                 ln -s $(CURDIR) $(MODLIB)/build ; \
1592         fi
1593         @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
1594         @cp -f modules.builtin $(MODLIB)/
1595         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1596
1597 endif # CONFIG_MODULES
1598
1599 ###
1600 # Cleaning is done on three levels.
1601 # make clean     Delete most generated files
1602 #                Leave enough to build external modules
1603 # make mrproper  Delete the current configuration, and all generated files
1604 # make distclean Remove editor backup files, patch leftover files and the like
1605
1606 # Directories & files removed with 'make clean'
1607 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1608                modules.builtin modules.builtin.modinfo modules.nsdeps \
1609                compile_commands.json .thinlto-cache rust/test rust/doc \
1610                .vmlinux.objs .vmlinux.export.c
1611
1612 # Directories & files removed with 'make mrproper'
1613 MRPROPER_FILES += include/config include/generated          \
1614                   arch/$(SRCARCH)/include/generated .objdiff \
1615                   snap tar-install \
1616                   .config .config.old .version \
1617                   Module.symvers \
1618                   certs/signing_key.pem \
1619                   certs/x509.genkey \
1620                   vmlinux-gdb.py \
1621                   *.spec \
1622                   rust/target.json rust/libmacros.so
1623
1624 # clean - Delete most, but leave enough to build external modules
1625 #
1626 clean: rm-files := $(CLEAN_FILES)
1627
1628 PHONY += archclean vmlinuxclean
1629
1630 vmlinuxclean:
1631         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1632         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1633
1634 clean: archclean vmlinuxclean resolve_btfids_clean
1635
1636 # mrproper - Delete all generated files, including .config
1637 #
1638 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1639 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1640
1641 PHONY += $(mrproper-dirs) mrproper
1642 $(mrproper-dirs):
1643         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1644
1645 mrproper: clean $(mrproper-dirs)
1646         $(call cmd,rmfiles)
1647         @find . $(RCS_FIND_IGNORE) \
1648                 \( -name '*.rmeta' \) \
1649                 -type f -print | xargs rm -f
1650
1651 # distclean
1652 #
1653 PHONY += distclean
1654
1655 distclean: mrproper
1656         @find . $(RCS_FIND_IGNORE) \
1657                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1658                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1659                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1660                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1661                 -type f -print | xargs rm -f
1662
1663
1664 # Packaging of the kernel to various formats
1665 # ---------------------------------------------------------------------------
1666
1667 %src-pkg: FORCE
1668         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1669 %pkg: include/config/kernel.release FORCE
1670         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1671
1672 # Brief documentation of the typical targets used
1673 # ---------------------------------------------------------------------------
1674
1675 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1676 boards := $(sort $(notdir $(boards)))
1677 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1678 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1679
1680 PHONY += help
1681 help:
1682         @echo  'Cleaning targets:'
1683         @echo  '  clean           - Remove most generated files but keep the config and'
1684         @echo  '                    enough build support to build external modules'
1685         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1686         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1687         @echo  ''
1688         @echo  'Configuration targets:'
1689         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1690         @echo  ''
1691         @echo  'Other generic targets:'
1692         @echo  '  all             - Build all targets marked with [*]'
1693         @echo  '* vmlinux         - Build the bare kernel'
1694         @echo  '* modules         - Build all modules'
1695         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1696         @echo  '  dir/            - Build all files in dir and below'
1697         @echo  '  dir/file.[ois]  - Build specified target only'
1698         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1699         @echo  '                    (requires compiler support for LLVM assembly generation)'
1700         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1701         @echo  '                    (requires a recent binutils and recent build (System.map))'
1702         @echo  '  dir/file.ko     - Build module including final link'
1703         @echo  '  modules_prepare - Set up for building external modules'
1704         @echo  '  tags/TAGS       - Generate tags file for editors'
1705         @echo  '  cscope          - Generate cscope index'
1706         @echo  '  gtags           - Generate GNU GLOBAL index'
1707         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1708         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1709         @echo  '  image_name      - Output the image name (use with make -s)'
1710         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1711          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1712          echo  ''
1713         @echo  'Static analysers:'
1714         @echo  '  checkstack      - Generate a list of stack hogs'
1715         @echo  '  versioncheck    - Sanity check on version.h usage'
1716         @echo  '  includecheck    - Check for duplicate included header files'
1717         @echo  '  export_report   - List the usages of all exported symbols'
1718         @echo  '  headerdep       - Detect inclusion cycles in headers'
1719         @echo  '  coccicheck      - Check with Coccinelle'
1720         @echo  '  clang-analyzer  - Check with clang static analyzer'
1721         @echo  '  clang-tidy      - Check with clang-tidy'
1722         @echo  ''
1723         @echo  'Tools:'
1724         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1725         @echo  ''
1726         @echo  'Kernel selftest:'
1727         @echo  '  kselftest         - Build and run kernel selftest'
1728         @echo  '                      Build, install, and boot kernel before'
1729         @echo  '                      running kselftest on it'
1730         @echo  '                      Run as root for full coverage'
1731         @echo  '  kselftest-all     - Build kernel selftest'
1732         @echo  '  kselftest-install - Build and install kernel selftest'
1733         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1734         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1735         @echo  '                      kselftest to existing .config.'
1736         @echo  ''
1737         @echo  'Rust targets:'
1738         @echo  '  rustavailable   - Checks whether the Rust toolchain is'
1739         @echo  '                    available and, if not, explains why.'
1740         @echo  '  rustfmt         - Reformat all the Rust code in the kernel'
1741         @echo  '  rustfmtcheck    - Checks if all the Rust code in the kernel'
1742         @echo  '                    is formatted, printing a diff otherwise.'
1743         @echo  '  rustdoc         - Generate Rust documentation'
1744         @echo  '                    (requires kernel .config)'
1745         @echo  '  rusttest        - Runs the Rust tests'
1746         @echo  '                    (requires kernel .config; downloads external repos)'
1747         @echo  '  rust-analyzer   - Generate rust-project.json rust-analyzer support file'
1748         @echo  '                    (requires kernel .config)'
1749         @echo  '  dir/file.[os]   - Build specified target only'
1750         @echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1751         @echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1752         @echo  '                    The output is not intended to be compilable.'
1753         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1754         @echo  ''
1755         @$(if $(dtstree), \
1756                 echo 'Devicetree:'; \
1757                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1758                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1759                 echo '  dt_binding_check - Validate device tree binding documents'; \
1760                 echo '  dtbs_check       - Validate device tree source files';\
1761                 echo '')
1762
1763         @echo 'Userspace tools targets:'
1764         @echo '  use "make tools/help"'
1765         @echo '  or  "cd tools; make help"'
1766         @echo  ''
1767         @echo  'Kernel packaging:'
1768         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1769         @echo  ''
1770         @echo  'Documentation targets:'
1771         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1772         @echo  ''
1773         @echo  'Architecture specific targets ($(SRCARCH)):'
1774         @$(or $(archhelp),\
1775                 echo '  No architecture specific help defined for $(SRCARCH)')
1776         @echo  ''
1777         @$(if $(boards), \
1778                 $(foreach b, $(boards), \
1779                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1780                 echo '')
1781         @$(if $(board-dirs), \
1782                 $(foreach b, $(board-dirs), \
1783                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1784                 printf "  %-16s - Show all of the above\\n" help-boards; \
1785                 echo '')
1786
1787         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1788         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1789         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1790         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1791         @echo  '                       (sparse by default)'
1792         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1793         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1794         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1795         @echo  '                1: warnings which may be relevant and do not occur too often'
1796         @echo  '                2: warnings which occur quite often but may still be relevant'
1797         @echo  '                3: more obscure warnings, can most likely be ignored'
1798         @echo  '                e: warnings are being treated as errors'
1799         @echo  '                Multiple levels can be combined with W=12 or W=123'
1800         @echo  ''
1801         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1802         @echo  'For further info see the ./README file'
1803
1804
1805 help-board-dirs := $(addprefix help-,$(board-dirs))
1806
1807 help-boards: $(help-board-dirs)
1808
1809 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1810
1811 $(help-board-dirs): help-%:
1812         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1813         @$(if $(boards-per-dir), \
1814                 $(foreach b, $(boards-per-dir), \
1815                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1816                 echo '')
1817
1818
1819 # Documentation targets
1820 # ---------------------------------------------------------------------------
1821 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1822                linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1823 PHONY += $(DOC_TARGETS)
1824 $(DOC_TARGETS):
1825         $(Q)$(MAKE) $(build)=Documentation $@
1826
1827
1828 # Rust targets
1829 # ---------------------------------------------------------------------------
1830
1831 # "Is Rust available?" target
1832 PHONY += rustavailable
1833 rustavailable:
1834         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!"
1835
1836 # Documentation target
1837 #
1838 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1839 PHONY += rustdoc
1840 rustdoc: prepare
1841         $(Q)$(MAKE) $(build)=rust $@
1842
1843 # Testing target
1844 PHONY += rusttest
1845 rusttest: prepare
1846         $(Q)$(MAKE) $(build)=rust $@
1847
1848 # Formatting targets
1849 PHONY += rustfmt rustfmtcheck
1850
1851 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1852 #
1853 # We match using absolute paths since `find` does not resolve them
1854 # when matching, which is a problem when e.g. `srctree` is `..`.
1855 # We `grep` afterwards in order to remove the directory entry itself.
1856 rustfmt:
1857         $(Q)find $(abs_srctree) -type f -name '*.rs' \
1858                 -o -path $(abs_srctree)/rust/alloc -prune \
1859                 -o -path $(abs_objtree)/rust/test -prune \
1860                 | grep -Fv $(abs_srctree)/rust/alloc \
1861                 | grep -Fv $(abs_objtree)/rust/test \
1862                 | grep -Fv generated \
1863                 | xargs $(RUSTFMT) $(rustfmt_flags)
1864
1865 rustfmtcheck: rustfmt_flags = --check
1866 rustfmtcheck: rustfmt
1867
1868 # IDE support targets
1869 PHONY += rust-analyzer
1870 rust-analyzer:
1871         $(Q)$(MAKE) $(build)=rust $@
1872
1873 # Misc
1874 # ---------------------------------------------------------------------------
1875
1876 PHONY += scripts_gdb
1877 scripts_gdb: prepare0
1878         $(Q)$(MAKE) $(build)=scripts/gdb
1879         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1880
1881 ifdef CONFIG_GDB_SCRIPTS
1882 all: scripts_gdb
1883 endif
1884
1885 else # KBUILD_EXTMOD
1886
1887 ###
1888 # External module support.
1889 # When building external modules the kernel used as basis is considered
1890 # read-only, and no consistency checks are made and the make
1891 # system is not used on the basis kernel. If updates are required
1892 # in the basis kernel ordinary make commands (without M=...) must be used.
1893
1894 # We are always building only modules.
1895 KBUILD_BUILTIN :=
1896 KBUILD_MODULES := 1
1897
1898 build-dir := $(KBUILD_EXTMOD)
1899
1900 compile_commands.json: $(extmod_prefix)compile_commands.json
1901 PHONY += compile_commands.json
1902
1903 clean-dirs := $(KBUILD_EXTMOD)
1904 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1905         $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1906
1907 PHONY += prepare
1908 # now expand this into a simple variable to reduce the cost of shell evaluations
1909 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1910 prepare:
1911         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1912                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1913                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1914                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1915         fi
1916
1917 PHONY += help
1918 help:
1919         @echo  '  Building external modules.'
1920         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1921         @echo  ''
1922         @echo  '  modules         - default target, build the module(s)'
1923         @echo  '  modules_install - install the module'
1924         @echo  '  clean           - remove generated files in module directory only'
1925         @echo  ''
1926
1927 endif # KBUILD_EXTMOD
1928
1929 # ---------------------------------------------------------------------------
1930 # Modules
1931
1932 PHONY += modules modules_install modules_prepare
1933
1934 ifdef CONFIG_MODULES
1935
1936 $(MODORDER): $(build-dir)
1937         @:
1938
1939 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1940 # This is solely useful to speed up test compiles.
1941 modules: modpost
1942 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1943         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1944 endif
1945
1946 PHONY += modules_check
1947 modules_check: $(MODORDER)
1948         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1949
1950 quiet_cmd_depmod = DEPMOD  $(MODLIB)
1951       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1952                    $(KERNELRELEASE)
1953
1954 modules_install:
1955         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1956         $(call cmd,depmod)
1957
1958 else # CONFIG_MODULES
1959
1960 # Modules not configured
1961 # ---------------------------------------------------------------------------
1962
1963 modules modules_install:
1964         @echo >&2 '***'
1965         @echo >&2 '*** The present kernel configuration has modules disabled.'
1966         @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1967         @echo >&2 '*** to enable CONFIG_MODULES.'
1968         @echo >&2 '***'
1969         @exit 1
1970
1971 KBUILD_MODULES :=
1972
1973 endif # CONFIG_MODULES
1974
1975 PHONY += modpost
1976 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1977          $(if $(KBUILD_MODULES), modules_check)
1978         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1979
1980 # Single targets
1981 # ---------------------------------------------------------------------------
1982 # To build individual files in subdirectories, you can do like this:
1983 #
1984 #   make foo/bar/baz.s
1985 #
1986 # The supported suffixes for single-target are listed in 'single-targets'
1987 #
1988 # To build only under specific subdirectories, you can do like this:
1989 #
1990 #   make foo/bar/baz/
1991
1992 ifdef single-build
1993
1994 # .ko is special because modpost is needed
1995 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1996 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1997                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1998
1999 $(single-ko): single_modules
2000         @:
2001 $(single-no-ko): $(build-dir)
2002         @:
2003
2004 # Remove MODORDER when done because it is not the real one.
2005 PHONY += single_modules
2006 single_modules: $(single-no-ko) modules_prepare
2007         $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
2008         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
2009 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
2010         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
2011 endif
2012         $(Q)rm -f $(MODORDER)
2013
2014 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
2015
2016 KBUILD_MODULES := 1
2017
2018 endif
2019
2020 # Preset locale variables to speed up the build process. Limit locale
2021 # tweaks to this spot to avoid wrong language settings when running
2022 # make menuconfig etc.
2023 # Error messages still appears in the original language
2024 PHONY += $(build-dir)
2025 $(build-dir): prepare
2026         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2027
2028 clean-dirs := $(addprefix _clean_, $(clean-dirs))
2029 PHONY += $(clean-dirs) clean
2030 $(clean-dirs):
2031         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2032
2033 clean: $(clean-dirs)
2034         $(call cmd,rmfiles)
2035         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
2036                 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2037                 -o -name '*.ko.*' \
2038                 -o -name '*.dtb' -o -name '*.dtbo' \
2039                 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
2040                 -o -name '*.dt.yaml' \
2041                 -o -name '*.dwo' -o -name '*.lst' \
2042                 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
2043                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2044                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2045                 -o -name '*.asn1.[ch]' \
2046                 -o -name '*.symtypes' -o -name 'modules.order' \
2047                 -o -name '.tmp_*' \
2048                 -o -name '*.c.[012]*.*' \
2049                 -o -name '*.ll' \
2050                 -o -name '*.gcno' \
2051                 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
2052
2053 # Generate tags for editors
2054 # ---------------------------------------------------------------------------
2055 quiet_cmd_tags = GEN     $@
2056       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2057
2058 tags TAGS cscope gtags: FORCE
2059         $(call cmd,tags)
2060
2061 # Script to generate missing namespace dependencies
2062 # ---------------------------------------------------------------------------
2063
2064 PHONY += nsdeps
2065 nsdeps: export KBUILD_NSDEPS=1
2066 nsdeps: modules
2067         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2068
2069 # Clang Tooling
2070 # ---------------------------------------------------------------------------
2071
2072 quiet_cmd_gen_compile_commands = GEN     $@
2073       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2074
2075 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
2076         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2077         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2078         $(call if_changed,gen_compile_commands)
2079
2080 targets += $(extmod_prefix)compile_commands.json
2081
2082 PHONY += clang-tidy clang-analyzer
2083
2084 ifdef CONFIG_CC_IS_CLANG
2085 quiet_cmd_clang_tools = CHECK   $<
2086       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2087
2088 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2089         $(call cmd,clang_tools)
2090 else
2091 clang-tidy clang-analyzer:
2092         @echo "$@ requires CC=clang" >&2
2093         @false
2094 endif
2095
2096 # Scripts to check various things for consistency
2097 # ---------------------------------------------------------------------------
2098
2099 PHONY += includecheck versioncheck coccicheck export_report
2100
2101 includecheck:
2102         find $(srctree)/* $(RCS_FIND_IGNORE) \
2103                 -name '*.[hcS]' -type f -print | sort \
2104                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2105
2106 versioncheck:
2107         find $(srctree)/* $(RCS_FIND_IGNORE) \
2108                 -name '*.[hcS]' -type f -print | sort \
2109                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2110
2111 coccicheck:
2112         $(Q)$(BASH) $(srctree)/scripts/$@
2113
2114 export_report:
2115         $(PERL) $(srctree)/scripts/export_report.pl
2116
2117 PHONY += checkstack kernelrelease kernelversion image_name
2118
2119 # UML needs a little special treatment here.  It wants to use the host
2120 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2121 # else wants $(ARCH), including people doing cross-builds, which means
2122 # that $(SUBARCH) doesn't work here.
2123 ifeq ($(ARCH), um)
2124 CHECKSTACK_ARCH := $(SUBARCH)
2125 else
2126 CHECKSTACK_ARCH := $(ARCH)
2127 endif
2128 checkstack:
2129         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2130         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2131
2132 kernelrelease:
2133         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2134
2135 kernelversion:
2136         @echo $(KERNELVERSION)
2137
2138 image_name:
2139         @echo $(KBUILD_IMAGE)
2140
2141 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2142       cmd_rmfiles = rm -rf $(rm-files)
2143
2144 # read saved command lines for existing targets
2145 existing-targets := $(wildcard $(sort $(targets)))
2146
2147 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2148
2149 endif # config-build
2150 endif # mixed-build
2151 endif # need-sub-make
2152
2153 PHONY += FORCE
2154 FORCE:
2155
2156 # Declare the contents of the PHONY variable as phony.  We keep that
2157 # information in a variable so we can use it in if_changed and friends.
2158 .PHONY: $(PHONY)