Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 19
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc4
   6 NAME = Superb Owl
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 $(if $(filter __%, $(MAKECMDGOALS)), \
  15         $(error targets prefixed with '__' are only for internal use))
  16
  17 # That's our default target when none is given on the command line
  18 PHONY := __all
  19 __all:
  20
  21 # We are using a recursive build, so we need to do a little thinking
  22 # to get the ordering right.
  23 #
  24 # Most importantly: sub-Makefiles should only ever modify files in
  25 # their own directory. If in some directory we have a dependency on
  26 # a file in another dir (which doesn't happen often, but it's often
  27 # unavoidable when linking the built-in.a targets which finally
  28 # turn into vmlinux), we will call a sub make in that other dir, and
  29 # after that we are sure that everything which is in that other dir
  30 # is now up to date.
  31 #
  32 # The only cases where we need to modify files which have global
  33 # effects are thus separated out and done before the recursive
  34 # descending is started. They are now explicitly listed as the
  35 # prepare rule.
  36
  37 ifneq ($(sub_make_done),1)
  38
  39 # Do not use make's built-in rules and variables
  40 # (this increases performance and avoids hard-to-debug behaviour)
  41 MAKEFLAGS += -rR
  42
  43 # Avoid funny character set dependencies
  44 unexport LC_ALL
  45 LC_COLLATE=C
  46 LC_NUMERIC=C
  47 export LC_COLLATE LC_NUMERIC
  48
  49 # Avoid interference with shell env settings
  50 unexport GREP_OPTIONS
  51
  52 # Beautify output
  53 # ---------------------------------------------------------------------------
  54 #
  55 # Normally, we echo the whole command before executing it. By making
  56 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  57 # $(quiet) to choose other forms of output instead, e.g.
  58 #
  59 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  60 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  61 #
  62 # If $(quiet) is empty, the whole command will be printed.
  63 # If it is set to "quiet_", only the short version will be printed.
  64 # If it is set to "silent_", nothing will be printed at all, since
  65 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  66 #
  67 # A simple variant is to prefix commands with $(Q) - that's useful
  68 # for commands that shall be hidden in non-verbose mode.
  69 #
  70 #       $(Q)ln $@ :<
  71 #
  72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
  75 #
  76 # To put more focus on warnings, be less verbose as default
  77 # Use 'make V=1' to see the full commands
  78
  79 ifeq ("$(origin V)", "command line")
  80   KBUILD_VERBOSE = $(V)
  81 endif
  82 ifndef KBUILD_VERBOSE
  83   KBUILD_VERBOSE = 0
  84 endif
  85
  86 ifeq ($(KBUILD_VERBOSE),1)
  87   quiet =
  88   Q =
  89 else
  90   quiet=quiet_
  91   Q = @
  92 endif
  93
  94 # If the user is running make -s (silent mode), suppress echoing of
  95 # commands
  96
  97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  98   quiet=silent_
  99   KBUILD_VERBOSE = 0
 100 endif
 101
 102 export quiet Q KBUILD_VERBOSE
 103
 104 # Call a source code checker (by default, "sparse") as part of the
 105 # C compilation.
 106 #
 107 # Use 'make C=1' to enable checking of only re-compiled files.
 108 # Use 'make C=2' to enable checking of *all* source files, regardless
 109 # of whether they are re-compiled or not.
 110 #
 111 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 112 # including where to get the "sparse" utility.
 113
 114 ifeq ("$(origin C)", "command line")
 115   KBUILD_CHECKSRC = $(C)
 116 endif
 117 ifndef KBUILD_CHECKSRC
 118   KBUILD_CHECKSRC = 0
 119 endif
 120
 121 export KBUILD_CHECKSRC
 122
 123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 124 # directory of external module to build. Setting M= takes precedence.
 125 ifeq ("$(origin M)", "command line")
 126   KBUILD_EXTMOD := $(M)
 127 endif
 128
 129 $(if $(word 2, $(KBUILD_EXTMOD)), \
 130         $(error building multiple external modules is not supported))
 131
 132 # Remove trailing slashes
 133 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 134 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 135 endif
 136
 137 export KBUILD_EXTMOD
 138
 139 # Kbuild will save output files in the current working directory.
 140 # This does not need to match to the root of the kernel source tree.
 141 #
 142 # For example, you can do this:
 143 #
 144 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 145 #
 146 # If you want to save output files in a different location, there are
 147 # two syntaxes to specify it.
 148 #
 149 # 1) O=
 150 # Use "make O=dir/to/store/output/files/"
 151 #
 152 # 2) Set KBUILD_OUTPUT
 153 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 154 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 155 #
 156 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 157 # variable.
 158
 159 # Do we want to change the working directory?
 160 ifeq ("$(origin O)", "command line")
 161   KBUILD_OUTPUT := $(O)
 162 endif
 163
 164 ifneq ($(KBUILD_OUTPUT),)
 165 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 166 # expand a shell special character '~'. We use a somewhat tedious way here.
 167 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 168 $(if $(abs_objtree),, \
 169      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 170
 171 # $(realpath ...) resolves symlinks
 172 abs_objtree := $(realpath $(abs_objtree))
 173 else
 174 abs_objtree := $(CURDIR)
 175 endif # ifneq ($(KBUILD_OUTPUT),)
 176
 177 ifeq ($(abs_objtree),$(CURDIR))
 178 # Suppress "Entering directory ..." unless we are changing the work directory.
 179 MAKEFLAGS += --no-print-directory
 180 else
 181 need-sub-make := 1
 182 endif
 183
 184 this-makefile := $(lastword $(MAKEFILE_LIST))
 185 abs_srctree := $(realpath $(dir $(this-makefile)))
 186
 187 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 188 $(error source directory cannot contain spaces or colons)
 189 endif
 190
 191 ifneq ($(abs_srctree),$(abs_objtree))
 192 # Look for make include files relative to root of kernel src
 193 #
 194 # --included-dir is added for backward compatibility, but you should not rely on
 195 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
 196 MAKEFLAGS += --include-dir=$(abs_srctree)
 197 endif
 198
 199 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 200 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 201 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 202 need-sub-make := 1
 203 # Cancel implicit rules for this Makefile.
 204 $(this-makefile): ;
 205 endif
 206
 207 export abs_srctree abs_objtree
 208 export sub_make_done := 1
 209
 210 ifeq ($(need-sub-make),1)
 211
 212 PHONY += $(MAKECMDGOALS) __sub-make
 213
 214 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 215         @:
 216
 217 # Invoke a second make in the output directory, passing relevant variables
 218 __sub-make:
 219         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 220
 221 endif # need-sub-make
 222 endif # sub_make_done
 223
 224 # We process the rest of the Makefile if this is the final invocation of make
 225 ifeq ($(need-sub-make),)
 226
 227 # Do not print "Entering directory ...",
 228 # but we want to display it when entering to the output directory
 229 # so that IDEs/editors are able to understand relative filenames.
 230 MAKEFLAGS += --no-print-directory
 231
 232 ifeq ($(abs_srctree),$(abs_objtree))
 233         # building in the source tree
 234         srctree := .
 235         building_out_of_srctree :=
 236 else
 237         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 238                 # building in a subdirectory of the source tree
 239                 srctree := ..
 240         else
 241                 srctree := $(abs_srctree)
 242         endif
 243         building_out_of_srctree := 1
 244 endif
 245
 246 ifneq ($(KBUILD_ABS_SRCTREE),)
 247 srctree := $(abs_srctree)
 248 endif
 249
 250 objtree         := .
 251 VPATH           := $(srctree)
 252
 253 export building_out_of_srctree srctree objtree VPATH
 254
 255 # To make sure we do not include .config for any of the *config targets
 256 # catch them early, and hand them over to scripts/kconfig/Makefile
 257 # It is allowed to specify more targets when calling make, including
 258 # mixing *config targets and build targets.
 259 # For example 'make oldconfig all'.
 260 # Detect when mixed targets is specified, and make a second invocation
 261 # of make so .config is not included in this case either (for *config).
 262
 263 version_h := include/generated/uapi/linux/version.h
 264
 265 clean-targets := %clean mrproper cleandocs
 266 no-dot-config-targets := $(clean-targets) \
 267                          cscope gtags TAGS tags help% %docs check% coccicheck \
 268                          $(version_h) headers headers_% archheaders archscripts \
 269                          %asm-generic kernelversion %src-pkg dt_binding_check \
 270                          outputmakefile
 271 # Installation targets should not require compiler. Unfortunately, vdso_install
 272 # is an exception where build artifacts may be updated. This must be fixed.
 273 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
 274                         headers_install modules_install kernelrelease image_name
 275 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
 276                           image_name
 277 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 278
 279 config-build    :=
 280 mixed-build     :=
 281 need-config     := 1
 282 need-compiler   := 1
 283 may-sync-config := 1
 284 single-build    :=
 285
 286 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 287         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 288                 need-config :=
 289         endif
 290 endif
 291
 292 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
 293         ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
 294                 need-compiler :=
 295         endif
 296 endif
 297
 298 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 299         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 300                 may-sync-config :=
 301         endif
 302 endif
 303
 304 ifneq ($(KBUILD_EXTMOD),)
 305         may-sync-config :=
 306 endif
 307
 308 ifeq ($(KBUILD_EXTMOD),)
 309         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 310                 config-build := 1
 311                 ifneq ($(words $(MAKECMDGOALS)),1)
 312                         mixed-build := 1
 313                 endif
 314         endif
 315 endif
 316
 317 # We cannot build single targets and the others at the same time
 318 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 319         single-build := 1
 320         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 321                 mixed-build := 1
 322         endif
 323 endif
 324
 325 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 326 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 327         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 328                 mixed-build := 1
 329         endif
 330 endif
 331
 332 # install and modules_install need also be processed one by one
 333 ifneq ($(filter install,$(MAKECMDGOALS)),)
 334         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 335                 mixed-build := 1
 336         endif
 337 endif
 338
 339 ifdef mixed-build
 340 # ===========================================================================
 341 # We're called with mixed targets (*config and build targets).
 342 # Handle them one by one.
 343
 344 PHONY += $(MAKECMDGOALS) __build_one_by_one
 345
 346 $(MAKECMDGOALS): __build_one_by_one
 347         @:
 348
 349 __build_one_by_one:
 350         $(Q)set -e; \
 351         for i in $(MAKECMDGOALS); do \
 352                 $(MAKE) -f $(srctree)/Makefile $$i; \
 353         done
 354
 355 else # !mixed-build
 356
 357 include $(srctree)/scripts/Kbuild.include
 358
 359 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 360 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 361 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 362 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 363
 364 include $(srctree)/scripts/subarch.include
 365
 366 # Cross compiling and selecting different set of gcc/bin-utils
 367 # ---------------------------------------------------------------------------
 368 #
 369 # When performing cross compilation for other architectures ARCH shall be set
 370 # to the target architecture. (See arch/* for the possibilities).
 371 # ARCH can be set during invocation of make:
 372 # make ARCH=ia64
 373 # Another way is to have ARCH set in the environment.
 374 # The default ARCH is the host where make is executed.
 375
 376 # CROSS_COMPILE specify the prefix used for all executables used
 377 # during compilation. Only gcc and related bin-utils executables
 378 # are prefixed with $(CROSS_COMPILE).
 379 # CROSS_COMPILE can be set on the command line
 380 # make CROSS_COMPILE=ia64-linux-
 381 # Alternatively CROSS_COMPILE can be set in the environment.
 382 # Default value for CROSS_COMPILE is not to prefix executables
 383 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 384 ARCH            ?= $(SUBARCH)
 385
 386 # Architecture as present in compile.h
 387 UTS_MACHINE     := $(ARCH)
 388 SRCARCH         := $(ARCH)
 389
 390 # Additional ARCH settings for x86
 391 ifeq ($(ARCH),i386)
 392         SRCARCH := x86
 393 endif
 394 ifeq ($(ARCH),x86_64)
 395         SRCARCH := x86
 396 endif
 397
 398 # Additional ARCH settings for sparc
 399 ifeq ($(ARCH),sparc32)
 400        SRCARCH := sparc
 401 endif
 402 ifeq ($(ARCH),sparc64)
 403        SRCARCH := sparc
 404 endif
 405
 406 # Additional ARCH settings for parisc
 407 ifeq ($(ARCH),parisc64)
 408        SRCARCH := parisc
 409 endif
 410
 411 export cross_compiling :=
 412 ifneq ($(SRCARCH),$(SUBARCH))
 413 cross_compiling := 1
 414 endif
 415
 416 KCONFIG_CONFIG  ?= .config
 417 export KCONFIG_CONFIG
 418
 419 # SHELL used by kbuild
 420 CONFIG_SHELL := sh
 421
 422 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 423 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 424 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 425
 426 ifneq ($(LLVM),)
 427 ifneq ($(filter %/,$(LLVM)),)
 428 LLVM_PREFIX := $(LLVM)
 429 else ifneq ($(filter -%,$(LLVM)),)
 430 LLVM_SUFFIX := $(LLVM)
 431 endif
 432
 433 HOSTCC  = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 434 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 435 else
 436 HOSTCC  = gcc
 437 HOSTCXX = g++
 438 endif
 439 HOSTPKG_CONFIG  = pkg-config
 440
 441 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 442                          -O2 -fomit-frame-pointer -std=gnu11 \
 443                          -Wdeclaration-after-statement
 444 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 445 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 446
 447 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 448 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 449 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 450 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 451
 452 # Make variables (CC, etc...)
 453 CPP             = $(CC) -E
 454 ifneq ($(LLVM),)
 455 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 456 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 457 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 458 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 459 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 460 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 461 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 462 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 463 else
 464 CC              = $(CROSS_COMPILE)gcc
 465 LD              = $(CROSS_COMPILE)ld
 466 AR              = $(CROSS_COMPILE)ar
 467 NM              = $(CROSS_COMPILE)nm
 468 OBJCOPY         = $(CROSS_COMPILE)objcopy
 469 OBJDUMP         = $(CROSS_COMPILE)objdump
 470 READELF         = $(CROSS_COMPILE)readelf
 471 STRIP           = $(CROSS_COMPILE)strip
 472 endif
 473 PAHOLE          = pahole
 474 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 475 LEX             = flex
 476 YACC            = bison
 477 AWK             = awk
 478 INSTALLKERNEL  := installkernel
 479 DEPMOD          = depmod
 480 PERL            = perl
 481 PYTHON3         = python3
 482 CHECK           = sparse
 483 BASH            = bash
 484 KGZIP           = gzip
 485 KBZIP2          = bzip2
 486 KLZOP           = lzop
 487 LZMA            = lzma
 488 LZ4             = lz4c
 489 XZ              = xz
 490 ZSTD            = zstd
 491
 492 PAHOLE_FLAGS    = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
 493
 494 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 495                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 496 NOSTDINC_FLAGS :=
 497 CFLAGS_MODULE   =
 498 AFLAGS_MODULE   =
 499 LDFLAGS_MODULE  =
 500 CFLAGS_KERNEL   =
 501 AFLAGS_KERNEL   =
 502 LDFLAGS_vmlinux =
 503
 504 # Use USERINCLUDE when you must reference the UAPI directories only.
 505 USERINCLUDE    := \
 506                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 507                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 508                 -I$(srctree)/include/uapi \
 509                 -I$(objtree)/include/generated/uapi \
 510                 -include $(srctree)/include/linux/compiler-version.h \
 511                 -include $(srctree)/include/linux/kconfig.h
 512
 513 # Use LINUXINCLUDE when you must reference the include/ directory.
 514 # Needed to be compatible with the O= option
 515 LINUXINCLUDE    := \
 516                 -I$(srctree)/arch/$(SRCARCH)/include \
 517                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 518                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 519                 -I$(objtree)/include \
 520                 $(USERINCLUDE)
 521
 522 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 523 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 524                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 525                    -Werror=implicit-function-declaration -Werror=implicit-int \
 526                    -Werror=return-type -Wno-format-security \
 527                    -std=gnu11
 528 KBUILD_CPPFLAGS := -D__KERNEL__
 529 KBUILD_AFLAGS_KERNEL :=
 530 KBUILD_CFLAGS_KERNEL :=
 531 KBUILD_AFLAGS_MODULE  := -DMODULE
 532 KBUILD_CFLAGS_MODULE  := -DMODULE
 533 KBUILD_LDFLAGS_MODULE :=
 534 KBUILD_LDFLAGS :=
 535 CLANG_FLAGS :=
 536
 537 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 538 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 539 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 540 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 541 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 542 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 543
 544 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 545 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 546 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 547 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 548 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 549 export PAHOLE_FLAGS
 550
 551 # Files to ignore in find ... statements
 552
 553 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 554                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 555                           -prune -o
 556 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 557                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 558
 559 # ===========================================================================
 560 # Rules shared between *config targets and build targets
 561
 562 # Basic helpers built in scripts/basic/
 563 PHONY += scripts_basic
 564 scripts_basic:
 565         $(Q)$(MAKE) $(build)=scripts/basic
 566
 567 PHONY += outputmakefile
 568 ifdef building_out_of_srctree
 569 # Before starting out-of-tree build, make sure the source tree is clean.
 570 # outputmakefile generates a Makefile in the output directory, if using a
 571 # separate output directory. This allows convenient use of make in the
 572 # output directory.
 573 # At the same time when output Makefile generated, generate .gitignore to
 574 # ignore whole output directory
 575
 576 quiet_cmd_makefile = GEN     Makefile
 577       cmd_makefile = { \
 578         echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 579         echo "include $(srctree)/Makefile"; \
 580         } > Makefile
 581
 582 outputmakefile:
 583         $(Q)if [ -f $(srctree)/.config -o \
 584                  -d $(srctree)/include/config -o \
 585                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 586                 echo >&2 "***"; \
 587                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 588                 echo >&2 "*** in $(abs_srctree)";\
 589                 echo >&2 "***"; \
 590                 false; \
 591         fi
 592         $(Q)ln -fsn $(srctree) source
 593         $(call cmd,makefile)
 594         $(Q)test -e .gitignore || \
 595         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 596 endif
 597
 598 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 599 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 600 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 601 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 602 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 603
 604 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 605 include $(srctree)/scripts/Makefile.clang
 606 endif
 607
 608 # Include this also for config targets because some architectures need
 609 # cc-cross-prefix to determine CROSS_COMPILE.
 610 ifdef need-compiler
 611 include $(srctree)/scripts/Makefile.compiler
 612 endif
 613
 614 ifdef config-build
 615 # ===========================================================================
 616 # *config targets only - make sure prerequisites are updated, and descend
 617 # in scripts/kconfig to make the *config target
 618
 619 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 620 # KBUILD_DEFCONFIG may point out an alternative default configuration
 621 # used for 'make defconfig'
 622 include $(srctree)/arch/$(SRCARCH)/Makefile
 623 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 624
 625 config: outputmakefile scripts_basic FORCE
 626         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 627
 628 %config: outputmakefile scripts_basic FORCE
 629         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 630
 631 else #!config-build
 632 # ===========================================================================
 633 # Build targets only - this includes vmlinux, arch specific targets, clean
 634 # targets and others. In general all targets except *config targets.
 635
 636 # If building an external module we do not care about the all: rule
 637 # but instead __all depend on modules
 638 PHONY += all
 639 ifeq ($(KBUILD_EXTMOD),)
 640 __all: all
 641 else
 642 __all: modules
 643 endif
 644
 645 # Decide whether to build built-in, modular, or both.
 646 # Normally, just do built-in.
 647
 648 KBUILD_MODULES :=
 649 KBUILD_BUILTIN := 1
 650
 651 # If we have only "make modules", don't compile built-in objects.
 652 ifeq ($(MAKECMDGOALS),modules)
 653   KBUILD_BUILTIN :=
 654 endif
 655
 656 # If we have "make <whatever> modules", compile modules
 657 # in addition to whatever we do anyway.
 658 # Just "make" or "make all" shall build modules as well
 659
 660 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 661   KBUILD_MODULES := 1
 662 endif
 663
 664 ifeq ($(MAKECMDGOALS),)
 665   KBUILD_MODULES := 1
 666 endif
 667
 668 export KBUILD_MODULES KBUILD_BUILTIN
 669
 670 ifdef need-config
 671 include include/config/auto.conf
 672 endif
 673
 674 ifeq ($(KBUILD_EXTMOD),)
 675 # Objects we will link into vmlinux / subdirs we need to visit
 676 core-y          := init/ usr/ arch/$(SRCARCH)/
 677 drivers-y       := drivers/ sound/
 678 drivers-$(CONFIG_SAMPLES) += samples/
 679 drivers-$(CONFIG_NET) += net/
 680 drivers-y       += virt/
 681 libs-y          := lib/
 682 endif # KBUILD_EXTMOD
 683
 684 # The all: target is the default when no target is given on the
 685 # command line.
 686 # This allow a user to issue only 'make' to build a kernel including modules
 687 # Defaults to vmlinux, but the arch makefile usually adds further targets
 688 all: vmlinux
 689
 690 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 691 ifdef CONFIG_CC_IS_GCC
 692 CFLAGS_GCOV     += -fno-tree-loop-im
 693 endif
 694 export CFLAGS_GCOV
 695
 696 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 697 ifdef CONFIG_FUNCTION_TRACER
 698   CC_FLAGS_FTRACE := -pg
 699 endif
 700
 701 include $(srctree)/arch/$(SRCARCH)/Makefile
 702
 703 ifdef need-config
 704 ifdef may-sync-config
 705 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 706 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 707 # because some architectures define CROSS_COMPILE there.
 708 include include/config/auto.conf.cmd
 709
 710 $(KCONFIG_CONFIG):
 711         @echo >&2 '***'
 712         @echo >&2 '*** Configuration file "$@" not found!'
 713         @echo >&2 '***'
 714         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 715         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 716         @echo >&2 '***'
 717         @/bin/false
 718
 719 # The actual configuration files used during the build are stored in
 720 # include/generated/ and include/config/. Update them if .config is newer than
 721 # include/config/auto.conf (which mirrors .config).
 722 #
 723 # This exploits the 'multi-target pattern rule' trick.
 724 # The syncconfig should be executed only once to make all the targets.
 725 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 726 #
 727 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 728 # so you cannot notice that Kconfig is waiting for the user input.
 729 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
 730         $(Q)$(kecho) "  SYNC    $@"
 731         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 732 else # !may-sync-config
 733 # External modules and some install targets need include/generated/autoconf.h
 734 # and include/config/auto.conf but do not care if they are up-to-date.
 735 # Use auto.conf to trigger the test
 736 PHONY += include/config/auto.conf
 737
 738 include/config/auto.conf:
 739         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 740         echo >&2;                                                       \
 741         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 742         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 743         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 744         echo >&2 ;                                                      \
 745         /bin/false)
 746
 747 endif # may-sync-config
 748 endif # need-config
 749
 750 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 751 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 752 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 753 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 754 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 755
 756 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 757 KBUILD_CFLAGS += -O2
 758 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 759 KBUILD_CFLAGS += -O3
 760 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 761 KBUILD_CFLAGS += -Os
 762 endif
 763
 764 # Tell gcc to never replace conditional load with a non-conditional one
 765 ifdef CONFIG_CC_IS_GCC
 766 # gcc-10 renamed --param=allow-store-data-races=0 to
 767 # -fno-allow-store-data-races.
 768 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 769 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 770 endif
 771
 772 ifdef CONFIG_READABLE_ASM
 773 # Disable optimizations that make assembler listings hard to read.
 774 # reorder blocks reorders the control in the function
 775 # ipa clone creates specialized cloned functions
 776 # partial inlining inlines only parts of functions
 777 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 778 endif
 779
 780 ifneq ($(CONFIG_FRAME_WARN),0)
 781 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 782 endif
 783
 784 stackp-flags-y                                    := -fno-stack-protector
 785 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 786 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 787
 788 KBUILD_CFLAGS += $(stackp-flags-y)
 789
 790 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
 791 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
 792 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
 793
 794 ifdef CONFIG_CC_IS_CLANG
 795 KBUILD_CPPFLAGS += -Qunused-arguments
 796 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
 797 KBUILD_CFLAGS += -Wno-gnu
 798 else
 799
 800 # gcc inanely warns about local variables called 'main'
 801 KBUILD_CFLAGS += -Wno-main
 802 endif
 803
 804 # These warnings generated too much noise in a regular build.
 805 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 806 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 807 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 808
 809 # These result in bogus false positives
 810 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
 811
 812 ifdef CONFIG_FRAME_POINTER
 813 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 814 else
 815 # Some targets (ARM with Thumb2, for example), can't be built with frame
 816 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 817 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 818 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 819 # -fomit-frame-pointer with FUNCTION_TRACER.
 820 ifndef CONFIG_FUNCTION_TRACER
 821 KBUILD_CFLAGS   += -fomit-frame-pointer
 822 endif
 823 endif
 824
 825 # Initialize all stack variables with a 0xAA pattern.
 826 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 827 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 828 endif
 829
 830 # Initialize all stack variables with a zero value.
 831 ifdef CONFIG_INIT_STACK_ALL_ZERO
 832 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 833 ifdef CONFIG_CC_IS_CLANG
 834 # https://bugs.llvm.org/show_bug.cgi?id=45497
 835 KBUILD_CFLAGS   += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 836 endif
 837 endif
 838
 839 # While VLAs have been removed, GCC produces unreachable stack probes
 840 # for the randomize_kstack_offset feature. Disable it for all compilers.
 841 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 842
 843 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 844 ifdef CONFIG_ZERO_CALL_USED_REGS
 845 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 846 endif
 847
 848 ifdef CONFIG_FUNCTION_TRACER
 849 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 850   CC_FLAGS_FTRACE       += -mrecord-mcount
 851   ifdef CONFIG_HAVE_NOP_MCOUNT
 852     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 853       CC_FLAGS_FTRACE   += -mnop-mcount
 854       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 855     endif
 856   endif
 857 endif
 858 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 859   CC_FLAGS_USING        += -DCC_USING_NOP_MCOUNT
 860 endif
 861 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 862   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 863     BUILD_C_RECORDMCOUNT := y
 864     export BUILD_C_RECORDMCOUNT
 865   endif
 866 endif
 867 ifdef CONFIG_HAVE_FENTRY
 868   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 869   ifeq ($(call cc-option-yn, -mfentry),y)
 870     CC_FLAGS_FTRACE     += -mfentry
 871     CC_FLAGS_USING      += -DCC_USING_FENTRY
 872   endif
 873 endif
 874 export CC_FLAGS_FTRACE
 875 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 876 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 877 endif
 878
 879 # We trigger additional mismatches with less inlining
 880 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 881 KBUILD_CFLAGS += -fno-inline-functions-called-once
 882 endif
 883
 884 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 885 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 886 LDFLAGS_vmlinux += --gc-sections
 887 endif
 888
 889 ifdef CONFIG_SHADOW_CALL_STACK
 890 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 891 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 892 export CC_FLAGS_SCS
 893 endif
 894
 895 ifdef CONFIG_LTO_CLANG
 896 ifdef CONFIG_LTO_CLANG_THIN
 897 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 898 KBUILD_LDFLAGS  += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 899 else
 900 CC_FLAGS_LTO    := -flto
 901 endif
 902 CC_FLAGS_LTO    += -fvisibility=hidden
 903
 904 # Limit inlining across translation units to reduce binary size
 905 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 906
 907 # Check for frame size exceeding threshold during prolog/epilog insertion
 908 # when using lld < 13.0.0.
 909 ifneq ($(CONFIG_FRAME_WARN),0)
 910 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
 911 KBUILD_LDFLAGS  += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
 912 endif
 913 endif
 914 endif
 915
 916 ifdef CONFIG_LTO
 917 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
 918 KBUILD_AFLAGS   += -fno-lto
 919 export CC_FLAGS_LTO
 920 endif
 921
 922 ifdef CONFIG_CFI_CLANG
 923 CC_FLAGS_CFI    := -fsanitize=cfi \
 924                    -fsanitize-cfi-cross-dso \
 925                    -fno-sanitize-cfi-canonical-jump-tables \
 926                    -fno-sanitize-trap=cfi \
 927                    -fno-sanitize-blacklist
 928
 929 ifdef CONFIG_CFI_PERMISSIVE
 930 CC_FLAGS_CFI    += -fsanitize-recover=cfi
 931 endif
 932
 933 # If LTO flags are filtered out, we must also filter out CFI.
 934 CC_FLAGS_LTO    += $(CC_FLAGS_CFI)
 935 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
 936 export CC_FLAGS_CFI
 937 endif
 938
 939 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
 940 KBUILD_CFLAGS += -falign-functions=64
 941 endif
 942
 943 # arch Makefile may override CC so keep this after arch Makefile is included
 944 NOSTDINC_FLAGS += -nostdinc
 945
 946 # warn about C99 declaration after statement
 947 KBUILD_CFLAGS += -Wdeclaration-after-statement
 948
 949 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 950 KBUILD_CFLAGS += -Wvla
 951
 952 # disable pointer signed / unsigned warnings in gcc 4.0
 953 KBUILD_CFLAGS += -Wno-pointer-sign
 954
 955 # In order to make sure new function cast mismatches are not introduced
 956 # in the kernel (to avoid tripping CFI checking), the kernel should be
 957 # globally built with -Wcast-function-type.
 958 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
 959
 960 # disable stringop warnings in gcc 8+
 961 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 962
 963 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 964 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 965
 966 # Another good warning that we'll want to enable eventually
 967 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 968
 969 # Enabled with W=2, disabled by default as noisy
 970 ifdef CONFIG_CC_IS_GCC
 971 KBUILD_CFLAGS += -Wno-maybe-uninitialized
 972 endif
 973
 974 ifdef CONFIG_CC_IS_GCC
 975 # The allocators already balk at large sizes, so silence the compiler
 976 # warnings for bounds checks involving those possible values. While
 977 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
 978 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
 979 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
 980 # doesn't work (as it is documented to), silently resolving to "0" prior to
 981 # version 9.1 (and producing an error more recently). Numeric values larger
 982 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
 983 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
 984 # choice, we must perform a versioned check to disable this warning.
 985 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
 986 KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than)
 987 endif
 988
 989 # disable invalid "can't wrap" optimizations for signed / pointers
 990 KBUILD_CFLAGS   += -fno-strict-overflow
 991
 992 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 993 KBUILD_CFLAGS  += -fno-stack-check
 994
 995 # conserve stack if available
 996 ifdef CONFIG_CC_IS_GCC
 997 KBUILD_CFLAGS   += -fconserve-stack
 998 endif
 999
1000 # Prohibit date/time macros, which would make the build non-deterministic
1001 KBUILD_CFLAGS   += -Werror=date-time
1002
1003 # enforce correct pointer usage
1004 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
1005
1006 # Require designated initializers for all marked structures
1007 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
1008
1009 # change __FILE__ to the relative path from the srctree
1010 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1011
1012 # include additional Makefiles when needed
1013 include-y                       := scripts/Makefile.extrawarn
1014 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1015 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1016 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1017 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1018 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1019 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1020 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1021
1022 include $(addprefix $(srctree)/, $(include-y))
1023
1024 # scripts/Makefile.gcc-plugins is intentionally included last.
1025 # Do not add $(call cc-option,...) below this line. When you build the kernel
1026 # from the clean source tree, the GCC plugins do not exist at this point.
1027
1028 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1029 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1030 KBUILD_AFLAGS   += $(KAFLAGS)
1031 KBUILD_CFLAGS   += $(KCFLAGS)
1032
1033 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1034 LDFLAGS_vmlinux += --build-id=sha1
1035
1036 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1037 LDFLAGS_vmlinux += $(call ld-option, -X,)
1038 endif
1039
1040 ifeq ($(CONFIG_RELR),y)
1041 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1042 endif
1043
1044 # We never want expected sections to be placed heuristically by the
1045 # linker. All sections should be explicitly named in the linker script.
1046 ifdef CONFIG_LD_ORPHAN_WARN
1047 LDFLAGS_vmlinux += --orphan-handling=warn
1048 endif
1049
1050 # Align the bit size of userspace programs with the kernel
1051 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1052 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1053
1054 # make the checker run with the right architecture
1055 CHECKFLAGS += --arch=$(ARCH)
1056
1057 # insure the checker run with the right endianness
1058 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1059
1060 # the checker needs the correct machine size
1061 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1062
1063 # Default kernel image to build when no specific target is given.
1064 # KBUILD_IMAGE may be overruled on the command line or
1065 # set in the environment
1066 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1067 # this default value
1068 export KBUILD_IMAGE ?= vmlinux
1069
1070 #
1071 # INSTALL_PATH specifies where to place the updated kernel and system map
1072 # images. Default is /boot, but you can set it to other values
1073 export  INSTALL_PATH ?= /boot
1074
1075 #
1076 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1077 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1078 # an argument if needed. Otherwise it defaults to the kernel install path
1079 #
1080 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1081
1082 #
1083 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1084 # relocations required by build roots.  This is not defined in the
1085 # makefile but the argument can be passed to make if needed.
1086 #
1087
1088 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1089 export MODLIB
1090
1091 PHONY += prepare0
1092
1093 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1094 export MODORDER := $(extmod_prefix)modules.order
1095 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1096
1097 ifeq ($(KBUILD_EXTMOD),)
1098 core-y                  += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/
1099 core-$(CONFIG_BLOCK)    += block/
1100
1101 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, \
1102                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1103                      $(libs-y) $(libs-m)))
1104
1105 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1106                      $(patsubst %/,%,$(filter %/, $(core-) \
1107                         $(drivers-) $(libs-))))
1108
1109 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1110                         $(core-y) $(core-m) $(libs-y) $(libs-m) \
1111                         $(drivers-y) $(drivers-m)))
1112
1113 build-dirs      := $(vmlinux-dirs)
1114 clean-dirs      := $(vmlinux-alldirs)
1115
1116 # Externally visible symbols (used by link-vmlinux.sh)
1117 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1118 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1119 ifdef CONFIG_MODULES
1120 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1121 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1122 else
1123 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1124 endif
1125 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1126
1127 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1128 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1129 # used by scripts/Makefile.package
1130 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1131
1132 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1133
1134 # Recurse until adjust_autoksyms.sh is satisfied
1135 PHONY += autoksyms_recursive
1136 ifdef CONFIG_TRIM_UNUSED_KSYMS
1137 # For the kernel to actually contain only the needed exported symbols,
1138 # we have to build modules as well to determine what those symbols are.
1139 # (this can be evaluated only once include/config/auto.conf has been included)
1140 KBUILD_MODULES := 1
1141
1142 autoksyms_recursive: descend modules.order
1143         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1144           "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1145 endif
1146
1147 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1148
1149 quiet_cmd_autoksyms_h = GEN     $@
1150       cmd_autoksyms_h = mkdir -p $(dir $@); \
1151                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1152
1153 $(autoksyms_h):
1154         $(call cmd,autoksyms_h)
1155
1156 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1157
1158 # Final link of vmlinux with optional arch pass after final link
1159 cmd_link-vmlinux =                                                 \
1160         $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1161         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1162
1163 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1164         +$(call if_changed_dep,link-vmlinux)
1165
1166 targets := vmlinux
1167
1168 # The actual objects are generated when descending,
1169 # make sure no implicit rule kicks in
1170 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1171
1172 filechk_kernel.release = \
1173         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1174
1175 # Store (new) KERNELRELEASE string in include/config/kernel.release
1176 include/config/kernel.release: FORCE
1177         $(call filechk,kernel.release)
1178
1179 # Additional helpers built in scripts/
1180 # Carefully list dependencies so we do not try to build scripts twice
1181 # in parallel
1182 PHONY += scripts
1183 scripts: scripts_basic scripts_dtc
1184         $(Q)$(MAKE) $(build)=$(@)
1185
1186 # Things we need to do before we recursively start building the kernel
1187 # or the modules are listed in "prepare".
1188 # A multi level approach is used. prepareN is processed before prepareN-1.
1189 # archprepare is used in arch Makefiles and when processed asm symlink,
1190 # version.h and scripts_basic is processed / created.
1191
1192 PHONY += prepare archprepare
1193
1194 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1195         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1196         include/generated/autoconf.h remove-stale-files
1197
1198 prepare0: archprepare
1199         $(Q)$(MAKE) $(build)=scripts/mod
1200         $(Q)$(MAKE) $(build)=.
1201
1202 # All the preparing..
1203 prepare: prepare0
1204
1205 PHONY += remove-stale-files
1206 remove-stale-files:
1207         $(Q)$(srctree)/scripts/remove-stale-files
1208
1209 # Support for using generic headers in asm-generic
1210 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1211
1212 PHONY += asm-generic uapi-asm-generic
1213 asm-generic: uapi-asm-generic
1214         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1215         generic=include/asm-generic
1216 uapi-asm-generic:
1217         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1218         generic=include/uapi/asm-generic
1219
1220 # Generate some files
1221 # ---------------------------------------------------------------------------
1222
1223 # KERNELRELEASE can change from a few different places, meaning version.h
1224 # needs to be updated, so this check is forced on all builds
1225
1226 uts_len := 64
1227 define filechk_utsrelease.h
1228         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1229           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1230           exit 1;                                                         \
1231         fi;                                                               \
1232         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1233 endef
1234
1235 define filechk_version.h
1236         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1237                 echo \#define LINUX_VERSION_CODE $(shell                 \
1238                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1239         else                                                             \
1240                 echo \#define LINUX_VERSION_CODE $(shell                 \
1241                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1242         fi;                                                              \
1243         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1244         ((c) > 255 ? 255 : (c)))';                                       \
1245         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1246         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1247         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1248 endef
1249
1250 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1251 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1252 $(version_h): FORCE
1253         $(call filechk,version.h)
1254
1255 include/generated/utsrelease.h: include/config/kernel.release FORCE
1256         $(call filechk,utsrelease.h)
1257
1258 PHONY += headerdep
1259 headerdep:
1260         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1261         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1262
1263 # ---------------------------------------------------------------------------
1264 # Kernel headers
1265
1266 #Default location for installed headers
1267 export INSTALL_HDR_PATH = $(objtree)/usr
1268
1269 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1270       cmd_headers_install = \
1271         mkdir -p $(INSTALL_HDR_PATH); \
1272         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1273         usr/include $(INSTALL_HDR_PATH)
1274
1275 PHONY += headers_install
1276 headers_install: headers
1277         $(call cmd,headers_install)
1278
1279 PHONY += archheaders archscripts
1280
1281 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1282
1283 PHONY += headers
1284 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1285         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1286           $(error Headers not exportable for the $(SRCARCH) architecture))
1287         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1288         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1289
1290 ifdef CONFIG_HEADERS_INSTALL
1291 prepare: headers
1292 endif
1293
1294 PHONY += scripts_unifdef
1295 scripts_unifdef: scripts_basic
1296         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1297
1298 # ---------------------------------------------------------------------------
1299 # Install
1300
1301 # Many distributions have the custom install script, /sbin/installkernel.
1302 # If DKMS is installed, 'make install' will eventually recurse back
1303 # to this Makefile to build and install external modules.
1304 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1305
1306 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1307       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1308
1309 # ---------------------------------------------------------------------------
1310 # Tools
1311
1312 ifdef CONFIG_OBJTOOL
1313 prepare: tools/objtool
1314 endif
1315
1316 ifdef CONFIG_BPF
1317 ifdef CONFIG_DEBUG_INFO_BTF
1318 prepare: tools/bpf/resolve_btfids
1319 endif
1320 endif
1321
1322 PHONY += resolve_btfids_clean
1323
1324 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1325
1326 # tools/bpf/resolve_btfids directory might not exist
1327 # in output directory, skip its clean in that case
1328 resolve_btfids_clean:
1329 ifneq ($(wildcard $(resolve_btfids_O)),)
1330         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1331 endif
1332
1333 # Clear a bunch of variables before executing the submake
1334 ifeq ($(quiet),silent_)
1335 tools_silent=s
1336 endif
1337
1338 tools/: FORCE
1339         $(Q)mkdir -p $(objtree)/tools
1340         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1341
1342 tools/%: FORCE
1343         $(Q)mkdir -p $(objtree)/tools
1344         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1345
1346 # ---------------------------------------------------------------------------
1347 # Kernel selftest
1348
1349 PHONY += kselftest
1350 kselftest:
1351         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1352
1353 kselftest-%: FORCE
1354         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1355
1356 PHONY += kselftest-merge
1357 kselftest-merge:
1358         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1359         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1360                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1361         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1362
1363 # ---------------------------------------------------------------------------
1364 # Devicetree files
1365
1366 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1367 dtstree := arch/$(SRCARCH)/boot/dts
1368 endif
1369
1370 ifneq ($(dtstree),)
1371
1372 %.dtb: include/config/kernel.release scripts_dtc
1373         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1374
1375 %.dtbo: include/config/kernel.release scripts_dtc
1376         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1377
1378 PHONY += dtbs dtbs_install dtbs_check
1379 dtbs: include/config/kernel.release scripts_dtc
1380         $(Q)$(MAKE) $(build)=$(dtstree)
1381
1382 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1383 export CHECK_DTBS=y
1384 dtbs: dt_binding_check
1385 endif
1386
1387 dtbs_check: dtbs
1388
1389 dtbs_install:
1390         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1391
1392 ifdef CONFIG_OF_EARLY_FLATTREE
1393 all: dtbs
1394 endif
1395
1396 endif
1397
1398 PHONY += scripts_dtc
1399 scripts_dtc: scripts_basic
1400         $(Q)$(MAKE) $(build)=scripts/dtc
1401
1402 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1403 export CHECK_DT_BINDING=y
1404 endif
1405
1406 PHONY += dt_binding_check
1407 dt_binding_check: scripts_dtc
1408         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1409
1410 # ---------------------------------------------------------------------------
1411 # Modules
1412
1413 ifdef CONFIG_MODULES
1414
1415 # By default, build modules as well
1416
1417 all: modules
1418
1419 # When we're building modules with modversions, we need to consider
1420 # the built-in objects during the descend as well, in order to
1421 # make sure the checksums are up to date before we record them.
1422 ifdef CONFIG_MODVERSIONS
1423   KBUILD_BUILTIN := 1
1424 endif
1425
1426 # Build modules
1427 #
1428 # A module can be listed more than once in obj-m resulting in
1429 # duplicate lines in modules.order files.  Those are removed
1430 # using awk while concatenating to the final file.
1431
1432 PHONY += modules
1433 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1434
1435 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1436
1437 modules.order: $(subdir-modorder) FORCE
1438         $(call if_changed,modules_order)
1439
1440 targets += modules.order
1441
1442 # Target to prepare building external modules
1443 PHONY += modules_prepare
1444 modules_prepare: prepare
1445         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1446
1447 export modules_sign_only :=
1448
1449 ifeq ($(CONFIG_MODULE_SIG),y)
1450 PHONY += modules_sign
1451 modules_sign: modules_install
1452         @:
1453
1454 # modules_sign is a subset of modules_install.
1455 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1456 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1457 modules_sign_only := y
1458 endif
1459 endif
1460
1461 modinst_pre :=
1462 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1463 modinst_pre := __modinst_pre
1464 endif
1465
1466 modules_install: $(modinst_pre)
1467 PHONY += __modinst_pre
1468 __modinst_pre:
1469         @rm -rf $(MODLIB)/kernel
1470         @rm -f $(MODLIB)/source
1471         @mkdir -p $(MODLIB)/kernel
1472         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1473         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1474                 rm -f $(MODLIB)/build ; \
1475                 ln -s $(CURDIR) $(MODLIB)/build ; \
1476         fi
1477         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1478         @cp -f modules.builtin $(MODLIB)/
1479         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1480
1481 endif # CONFIG_MODULES
1482
1483 ###
1484 # Cleaning is done on three levels.
1485 # make clean     Delete most generated files
1486 #                Leave enough to build external modules
1487 # make mrproper  Delete the current configuration, and all generated files
1488 # make distclean Remove editor backup files, patch leftover files and the like
1489
1490 # Directories & files removed with 'make clean'
1491 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1492                modules.builtin modules.builtin.modinfo modules.nsdeps \
1493                compile_commands.json .thinlto-cache
1494
1495 # Directories & files removed with 'make mrproper'
1496 MRPROPER_FILES += include/config include/generated          \
1497                   arch/$(SRCARCH)/include/generated .objdiff \
1498                   debian snap tar-install \
1499                   .config .config.old .version \
1500                   Module.symvers \
1501                   certs/signing_key.pem \
1502                   certs/x509.genkey \
1503                   vmlinux-gdb.py \
1504                   *.spec
1505
1506 # clean - Delete most, but leave enough to build external modules
1507 #
1508 clean: rm-files := $(CLEAN_FILES)
1509
1510 PHONY += archclean vmlinuxclean
1511
1512 vmlinuxclean:
1513         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1514         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1515
1516 clean: archclean vmlinuxclean resolve_btfids_clean
1517
1518 # mrproper - Delete all generated files, including .config
1519 #
1520 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1521 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1522
1523 PHONY += $(mrproper-dirs) mrproper
1524 $(mrproper-dirs):
1525         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1526
1527 mrproper: clean $(mrproper-dirs)
1528         $(call cmd,rmfiles)
1529
1530 # distclean
1531 #
1532 PHONY += distclean
1533
1534 distclean: mrproper
1535         @find . $(RCS_FIND_IGNORE) \
1536                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1537                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1538                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1539                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1540                 -type f -print | xargs rm -f
1541
1542
1543 # Packaging of the kernel to various formats
1544 # ---------------------------------------------------------------------------
1545
1546 %src-pkg: FORCE
1547         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1548 %pkg: include/config/kernel.release FORCE
1549         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1550
1551 # Brief documentation of the typical targets used
1552 # ---------------------------------------------------------------------------
1553
1554 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1555 boards := $(sort $(notdir $(boards)))
1556 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1557 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1558
1559 PHONY += help
1560 help:
1561         @echo  'Cleaning targets:'
1562         @echo  '  clean           - Remove most generated files but keep the config and'
1563         @echo  '                    enough build support to build external modules'
1564         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1565         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1566         @echo  ''
1567         @echo  'Configuration targets:'
1568         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1569         @echo  ''
1570         @echo  'Other generic targets:'
1571         @echo  '  all             - Build all targets marked with [*]'
1572         @echo  '* vmlinux         - Build the bare kernel'
1573         @echo  '* modules         - Build all modules'
1574         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1575         @echo  '  dir/            - Build all files in dir and below'
1576         @echo  '  dir/file.[ois]  - Build specified target only'
1577         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1578         @echo  '                    (requires compiler support for LLVM assembly generation)'
1579         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1580         @echo  '                    (requires a recent binutils and recent build (System.map))'
1581         @echo  '  dir/file.ko     - Build module including final link'
1582         @echo  '  modules_prepare - Set up for building external modules'
1583         @echo  '  tags/TAGS       - Generate tags file for editors'
1584         @echo  '  cscope          - Generate cscope index'
1585         @echo  '  gtags           - Generate GNU GLOBAL index'
1586         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1587         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1588         @echo  '  image_name      - Output the image name (use with make -s)'
1589         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1590          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1591          echo  ''
1592         @echo  'Static analysers:'
1593         @echo  '  checkstack      - Generate a list of stack hogs'
1594         @echo  '  versioncheck    - Sanity check on version.h usage'
1595         @echo  '  includecheck    - Check for duplicate included header files'
1596         @echo  '  export_report   - List the usages of all exported symbols'
1597         @echo  '  headerdep       - Detect inclusion cycles in headers'
1598         @echo  '  coccicheck      - Check with Coccinelle'
1599         @echo  '  clang-analyzer  - Check with clang static analyzer'
1600         @echo  '  clang-tidy      - Check with clang-tidy'
1601         @echo  ''
1602         @echo  'Tools:'
1603         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1604         @echo  ''
1605         @echo  'Kernel selftest:'
1606         @echo  '  kselftest         - Build and run kernel selftest'
1607         @echo  '                      Build, install, and boot kernel before'
1608         @echo  '                      running kselftest on it'
1609         @echo  '                      Run as root for full coverage'
1610         @echo  '  kselftest-all     - Build kernel selftest'
1611         @echo  '  kselftest-install - Build and install kernel selftest'
1612         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1613         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1614         @echo  '                      kselftest to existing .config.'
1615         @echo  ''
1616         @$(if $(dtstree), \
1617                 echo 'Devicetree:'; \
1618                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1619                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1620                 echo '  dt_binding_check - Validate device tree binding documents'; \
1621                 echo '  dtbs_check       - Validate device tree source files';\
1622                 echo '')
1623
1624         @echo 'Userspace tools targets:'
1625         @echo '  use "make tools/help"'
1626         @echo '  or  "cd tools; make help"'
1627         @echo  ''
1628         @echo  'Kernel packaging:'
1629         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1630         @echo  ''
1631         @echo  'Documentation targets:'
1632         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1633         @echo  ''
1634         @echo  'Architecture specific targets ($(SRCARCH)):'
1635         @$(or $(archhelp),\
1636                 echo '  No architecture specific help defined for $(SRCARCH)')
1637         @echo  ''
1638         @$(if $(boards), \
1639                 $(foreach b, $(boards), \
1640                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1641                 echo '')
1642         @$(if $(board-dirs), \
1643                 $(foreach b, $(board-dirs), \
1644                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1645                 printf "  %-16s - Show all of the above\\n" help-boards; \
1646                 echo '')
1647
1648         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1649         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1650         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1651         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1652         @echo  '                       (sparse by default)'
1653         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1654         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1655         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1656         @echo  '                1: warnings which may be relevant and do not occur too often'
1657         @echo  '                2: warnings which occur quite often but may still be relevant'
1658         @echo  '                3: more obscure warnings, can most likely be ignored'
1659         @echo  '                e: warnings are being treated as errors'
1660         @echo  '                Multiple levels can be combined with W=12 or W=123'
1661         @echo  ''
1662         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1663         @echo  'For further info see the ./README file'
1664
1665
1666 help-board-dirs := $(addprefix help-,$(board-dirs))
1667
1668 help-boards: $(help-board-dirs)
1669
1670 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1671
1672 $(help-board-dirs): help-%:
1673         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1674         @$(if $(boards-per-dir), \
1675                 $(foreach b, $(boards-per-dir), \
1676                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1677                 echo '')
1678
1679
1680 # Documentation targets
1681 # ---------------------------------------------------------------------------
1682 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1683                linkcheckdocs dochelp refcheckdocs
1684 PHONY += $(DOC_TARGETS)
1685 $(DOC_TARGETS):
1686         $(Q)$(MAKE) $(build)=Documentation $@
1687
1688 # Misc
1689 # ---------------------------------------------------------------------------
1690
1691 PHONY += scripts_gdb
1692 scripts_gdb: prepare0
1693         $(Q)$(MAKE) $(build)=scripts/gdb
1694         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1695
1696 ifdef CONFIG_GDB_SCRIPTS
1697 all: scripts_gdb
1698 endif
1699
1700 else # KBUILD_EXTMOD
1701
1702 ###
1703 # External module support.
1704 # When building external modules the kernel used as basis is considered
1705 # read-only, and no consistency checks are made and the make
1706 # system is not used on the basis kernel. If updates are required
1707 # in the basis kernel ordinary make commands (without M=...) must be used.
1708
1709 # We are always building only modules.
1710 KBUILD_BUILTIN :=
1711 KBUILD_MODULES := 1
1712
1713 build-dirs := $(KBUILD_EXTMOD)
1714 $(MODORDER): descend
1715         @:
1716
1717 compile_commands.json: $(extmod_prefix)compile_commands.json
1718 PHONY += compile_commands.json
1719
1720 clean-dirs := $(KBUILD_EXTMOD)
1721 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1722         $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1723
1724 PHONY += prepare
1725 # now expand this into a simple variable to reduce the cost of shell evaluations
1726 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1727 prepare:
1728         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1729                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1730                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1731                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1732         fi
1733
1734 PHONY += help
1735 help:
1736         @echo  '  Building external modules.'
1737         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1738         @echo  ''
1739         @echo  '  modules         - default target, build the module(s)'
1740         @echo  '  modules_install - install the module'
1741         @echo  '  clean           - remove generated files in module directory only'
1742         @echo  ''
1743
1744 # no-op for external module builds
1745 PHONY += modules_prepare
1746
1747 endif # KBUILD_EXTMOD
1748
1749 # ---------------------------------------------------------------------------
1750 # Modules
1751
1752 PHONY += modules modules_install
1753
1754 ifdef CONFIG_MODULES
1755
1756 modules: modules_check
1757         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1758
1759 PHONY += modules_check
1760 modules_check: $(MODORDER)
1761         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1762
1763 quiet_cmd_depmod = DEPMOD  $(MODLIB)
1764       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1765                    $(KERNELRELEASE)
1766
1767 modules_install:
1768         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1769         $(call cmd,depmod)
1770
1771 else # CONFIG_MODULES
1772
1773 # Modules not configured
1774 # ---------------------------------------------------------------------------
1775
1776 modules modules_install:
1777         @echo >&2 '***'
1778         @echo >&2 '*** The present kernel configuration has modules disabled.'
1779         @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1780         @echo >&2 '*** to enable CONFIG_MODULES.'
1781         @echo >&2 '***'
1782         @exit 1
1783
1784 endif # CONFIG_MODULES
1785
1786 # Single targets
1787 # ---------------------------------------------------------------------------
1788 # To build individual files in subdirectories, you can do like this:
1789 #
1790 #   make foo/bar/baz.s
1791 #
1792 # The supported suffixes for single-target are listed in 'single-targets'
1793 #
1794 # To build only under specific subdirectories, you can do like this:
1795 #
1796 #   make foo/bar/baz/
1797
1798 ifdef single-build
1799
1800 # .ko is special because modpost is needed
1801 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1802 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1803                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1804
1805 $(single-ko): single_modpost
1806         @:
1807 $(single-no-ko): descend
1808         @:
1809
1810 ifeq ($(KBUILD_EXTMOD),)
1811 # For the single build of in-tree modules, use a temporary file to avoid
1812 # the situation of modules_install installing an invalid modules.order.
1813 MODORDER := .modules.tmp
1814 endif
1815
1816 PHONY += single_modpost
1817 single_modpost: $(single-no-ko) modules_prepare
1818         $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1819         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1820
1821 KBUILD_MODULES := 1
1822
1823 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1824
1825 # trim unrelated directories
1826 build-dirs := $(foreach d, $(build-dirs), \
1827                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1828
1829 endif
1830
1831 ifndef CONFIG_MODULES
1832 KBUILD_MODULES :=
1833 endif
1834
1835 # Handle descending into subdirectories listed in $(build-dirs)
1836 # Preset locale variables to speed up the build process. Limit locale
1837 # tweaks to this spot to avoid wrong language settings when running
1838 # make menuconfig etc.
1839 # Error messages still appears in the original language
1840 PHONY += descend $(build-dirs)
1841 descend: $(build-dirs)
1842 $(build-dirs): prepare
1843         $(Q)$(MAKE) $(build)=$@ \
1844         single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1845         need-builtin=1 need-modorder=1
1846
1847 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1848 PHONY += $(clean-dirs) clean
1849 $(clean-dirs):
1850         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1851
1852 clean: $(clean-dirs)
1853         $(call cmd,rmfiles)
1854         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1855                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1856                 -o -name '*.ko.*' \
1857                 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1858                 -o -name '*.dwo' -o -name '*.lst' \
1859                 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
1860                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1861                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1862                 -o -name '*.asn1.[ch]' \
1863                 -o -name '*.symtypes' -o -name 'modules.order' \
1864                 -o -name '.tmp_*' \
1865                 -o -name '*.c.[012]*.*' \
1866                 -o -name '*.ll' \
1867                 -o -name '*.gcno' \
1868                 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1869
1870 # Generate tags for editors
1871 # ---------------------------------------------------------------------------
1872 quiet_cmd_tags = GEN     $@
1873       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1874
1875 tags TAGS cscope gtags: FORCE
1876         $(call cmd,tags)
1877
1878 # Script to generate missing namespace dependencies
1879 # ---------------------------------------------------------------------------
1880
1881 PHONY += nsdeps
1882 nsdeps: export KBUILD_NSDEPS=1
1883 nsdeps: modules
1884         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1885
1886 # Clang Tooling
1887 # ---------------------------------------------------------------------------
1888
1889 quiet_cmd_gen_compile_commands = GEN     $@
1890       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1891
1892 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1893         $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1894         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1895         $(call if_changed,gen_compile_commands)
1896
1897 targets += $(extmod_prefix)compile_commands.json
1898
1899 PHONY += clang-tidy clang-analyzer
1900
1901 ifdef CONFIG_CC_IS_CLANG
1902 quiet_cmd_clang_tools = CHECK   $<
1903       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1904
1905 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1906         $(call cmd,clang_tools)
1907 else
1908 clang-tidy clang-analyzer:
1909         @echo "$@ requires CC=clang" >&2
1910         @false
1911 endif
1912
1913 # Scripts to check various things for consistency
1914 # ---------------------------------------------------------------------------
1915
1916 PHONY += includecheck versioncheck coccicheck export_report
1917
1918 includecheck:
1919         find $(srctree)/* $(RCS_FIND_IGNORE) \
1920                 -name '*.[hcS]' -type f -print | sort \
1921                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1922
1923 versioncheck:
1924         find $(srctree)/* $(RCS_FIND_IGNORE) \
1925                 -name '*.[hcS]' -type f -print | sort \
1926                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1927
1928 coccicheck:
1929         $(Q)$(BASH) $(srctree)/scripts/$@
1930
1931 export_report:
1932         $(PERL) $(srctree)/scripts/export_report.pl
1933
1934 PHONY += checkstack kernelrelease kernelversion image_name
1935
1936 # UML needs a little special treatment here.  It wants to use the host
1937 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1938 # else wants $(ARCH), including people doing cross-builds, which means
1939 # that $(SUBARCH) doesn't work here.
1940 ifeq ($(ARCH), um)
1941 CHECKSTACK_ARCH := $(SUBARCH)
1942 else
1943 CHECKSTACK_ARCH := $(ARCH)
1944 endif
1945 checkstack:
1946         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1947         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1948
1949 kernelrelease:
1950         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1951
1952 kernelversion:
1953         @echo $(KERNELVERSION)
1954
1955 image_name:
1956         @echo $(KBUILD_IMAGE)
1957
1958 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1959       cmd_rmfiles = rm -rf $(rm-files)
1960
1961 # read saved command lines for existing targets
1962 existing-targets := $(wildcard $(sort $(targets)))
1963
1964 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1965
1966 endif # config-build
1967 endif # mixed-build
1968 endif # need-sub-make
1969
1970 PHONY += FORCE
1971 FORCE:
1972
1973 # Declare the contents of the PHONY variable as phony.  We keep that
1974 # information in a variable so we can use it in if_changed and friends.
1975 .PHONY: $(PHONY)