Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 11
   4 SUBLEVEL = 0
   5 EXTRAVERSION =
   6 NAME = 💕 Valentine's Day Edition 💕
   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 --%,$(MAKEFLAGS))),)
  98   quiet=silent_
  99 endif
 100
 101 export quiet Q KBUILD_VERBOSE
 102
 103 # Call a source code checker (by default, "sparse") as part of the
 104 # C compilation.
 105 #
 106 # Use 'make C=1' to enable checking of only re-compiled files.
 107 # Use 'make C=2' to enable checking of *all* source files, regardless
 108 # of whether they are re-compiled or not.
 109 #
 110 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 111 # including where to get the "sparse" utility.
 112
 113 ifeq ("$(origin C)", "command line")
 114   KBUILD_CHECKSRC = $(C)
 115 endif
 116 ifndef KBUILD_CHECKSRC
 117   KBUILD_CHECKSRC = 0
 118 endif
 119
 120 export KBUILD_CHECKSRC
 121
 122 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 123 # directory of external module to build. Setting M= takes precedence.
 124 ifeq ("$(origin M)", "command line")
 125   KBUILD_EXTMOD := $(M)
 126 endif
 127
 128 $(if $(word 2, $(KBUILD_EXTMOD)), \
 129         $(error building multiple external modules is not supported))
 130
 131 export KBUILD_EXTMOD
 132
 133 # Kbuild will save output files in the current working directory.
 134 # This does not need to match to the root of the kernel source tree.
 135 #
 136 # For example, you can do this:
 137 #
 138 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 139 #
 140 # If you want to save output files in a different location, there are
 141 # two syntaxes to specify it.
 142 #
 143 # 1) O=
 144 # Use "make O=dir/to/store/output/files/"
 145 #
 146 # 2) Set KBUILD_OUTPUT
 147 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 148 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 149 #
 150 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 151 # variable.
 152
 153 # Do we want to change the working directory?
 154 ifeq ("$(origin O)", "command line")
 155   KBUILD_OUTPUT := $(O)
 156 endif
 157
 158 ifneq ($(KBUILD_OUTPUT),)
 159 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 160 # expand a shell special character '~'. We use a somewhat tedious way here.
 161 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 162 $(if $(abs_objtree),, \
 163      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 164
 165 # $(realpath ...) resolves symlinks
 166 abs_objtree := $(realpath $(abs_objtree))
 167 else
 168 abs_objtree := $(CURDIR)
 169 endif # ifneq ($(KBUILD_OUTPUT),)
 170
 171 ifeq ($(abs_objtree),$(CURDIR))
 172 # Suppress "Entering directory ..." unless we are changing the work directory.
 173 MAKEFLAGS += --no-print-directory
 174 else
 175 need-sub-make := 1
 176 endif
 177
 178 this-makefile := $(lastword $(MAKEFILE_LIST))
 179 abs_srctree := $(realpath $(dir $(this-makefile)))
 180
 181 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 182 $(error source directory cannot contain spaces or colons)
 183 endif
 184
 185 ifneq ($(abs_srctree),$(abs_objtree))
 186 # Look for make include files relative to root of kernel src
 187 #
 188 # This does not become effective immediately because MAKEFLAGS is re-parsed
 189 # once after the Makefile is read. We need to invoke sub-make.
 190 MAKEFLAGS += --include-dir=$(abs_srctree)
 191 need-sub-make := 1
 192 endif
 193
 194 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 195 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 196 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 197 need-sub-make := 1
 198 # Cancel implicit rules for this Makefile.
 199 $(this-makefile): ;
 200 endif
 201
 202 export abs_srctree abs_objtree
 203 export sub_make_done := 1
 204
 205 ifeq ($(need-sub-make),1)
 206
 207 PHONY += $(MAKECMDGOALS) __sub-make
 208
 209 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 210         @:
 211
 212 # Invoke a second make in the output directory, passing relevant variables
 213 __sub-make:
 214         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 215
 216 endif # need-sub-make
 217 endif # sub_make_done
 218
 219 # We process the rest of the Makefile if this is the final invocation of make
 220 ifeq ($(need-sub-make),)
 221
 222 # Do not print "Entering directory ...",
 223 # but we want to display it when entering to the output directory
 224 # so that IDEs/editors are able to understand relative filenames.
 225 MAKEFLAGS += --no-print-directory
 226
 227 ifeq ($(abs_srctree),$(abs_objtree))
 228         # building in the source tree
 229         srctree := .
 230         building_out_of_srctree :=
 231 else
 232         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 233                 # building in a subdirectory of the source tree
 234                 srctree := ..
 235         else
 236                 srctree := $(abs_srctree)
 237         endif
 238         building_out_of_srctree := 1
 239 endif
 240
 241 ifneq ($(KBUILD_ABS_SRCTREE),)
 242 srctree := $(abs_srctree)
 243 endif
 244
 245 objtree         := .
 246 VPATH           := $(srctree)
 247
 248 export building_out_of_srctree srctree objtree VPATH
 249
 250 # To make sure we do not include .config for any of the *config targets
 251 # catch them early, and hand them over to scripts/kconfig/Makefile
 252 # It is allowed to specify more targets when calling make, including
 253 # mixing *config targets and build targets.
 254 # For example 'make oldconfig all'.
 255 # Detect when mixed targets is specified, and make a second invocation
 256 # of make so .config is not included in this case either (for *config).
 257
 258 version_h := include/generated/uapi/linux/version.h
 259
 260 clean-targets := %clean mrproper cleandocs
 261 no-dot-config-targets := $(clean-targets) \
 262                          cscope gtags TAGS tags help% %docs check% coccicheck \
 263                          $(version_h) headers headers_% archheaders archscripts \
 264                          %asm-generic kernelversion %src-pkg dt_binding_check \
 265                          outputmakefile
 266 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
 267 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 268
 269 config-build    :=
 270 mixed-build     :=
 271 need-config     := 1
 272 may-sync-config := 1
 273 single-build    :=
 274
 275 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 276         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 277                 need-config :=
 278         endif
 279 endif
 280
 281 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 282         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 283                 may-sync-config :=
 284         endif
 285 endif
 286
 287 ifneq ($(KBUILD_EXTMOD),)
 288         may-sync-config :=
 289 endif
 290
 291 ifeq ($(KBUILD_EXTMOD),)
 292         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 293                 config-build := 1
 294                 ifneq ($(words $(MAKECMDGOALS)),1)
 295                         mixed-build := 1
 296                 endif
 297         endif
 298 endif
 299
 300 # We cannot build single targets and the others at the same time
 301 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 302         single-build := 1
 303         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 304                 mixed-build := 1
 305         endif
 306 endif
 307
 308 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 309 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 310         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 311                 mixed-build := 1
 312         endif
 313 endif
 314
 315 # install and modules_install need also be processed one by one
 316 ifneq ($(filter install,$(MAKECMDGOALS)),)
 317         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 318                 mixed-build := 1
 319         endif
 320 endif
 321
 322 ifdef mixed-build
 323 # ===========================================================================
 324 # We're called with mixed targets (*config and build targets).
 325 # Handle them one by one.
 326
 327 PHONY += $(MAKECMDGOALS) __build_one_by_one
 328
 329 $(MAKECMDGOALS): __build_one_by_one
 330         @:
 331
 332 __build_one_by_one:
 333         $(Q)set -e; \
 334         for i in $(MAKECMDGOALS); do \
 335                 $(MAKE) -f $(srctree)/Makefile $$i; \
 336         done
 337
 338 else # !mixed-build
 339
 340 include scripts/Kbuild.include
 341
 342 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 343 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 344 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 345 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 346
 347 include scripts/subarch.include
 348
 349 # Cross compiling and selecting different set of gcc/bin-utils
 350 # ---------------------------------------------------------------------------
 351 #
 352 # When performing cross compilation for other architectures ARCH shall be set
 353 # to the target architecture. (See arch/* for the possibilities).
 354 # ARCH can be set during invocation of make:
 355 # make ARCH=ia64
 356 # Another way is to have ARCH set in the environment.
 357 # The default ARCH is the host where make is executed.
 358
 359 # CROSS_COMPILE specify the prefix used for all executables used
 360 # during compilation. Only gcc and related bin-utils executables
 361 # are prefixed with $(CROSS_COMPILE).
 362 # CROSS_COMPILE can be set on the command line
 363 # make CROSS_COMPILE=ia64-linux-
 364 # Alternatively CROSS_COMPILE can be set in the environment.
 365 # Default value for CROSS_COMPILE is not to prefix executables
 366 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 367 ARCH            ?= $(SUBARCH)
 368
 369 # Architecture as present in compile.h
 370 UTS_MACHINE     := $(ARCH)
 371 SRCARCH         := $(ARCH)
 372
 373 # Additional ARCH settings for x86
 374 ifeq ($(ARCH),i386)
 375         SRCARCH := x86
 376 endif
 377 ifeq ($(ARCH),x86_64)
 378         SRCARCH := x86
 379 endif
 380
 381 # Additional ARCH settings for sparc
 382 ifeq ($(ARCH),sparc32)
 383        SRCARCH := sparc
 384 endif
 385 ifeq ($(ARCH),sparc64)
 386        SRCARCH := sparc
 387 endif
 388
 389 # Additional ARCH settings for sh
 390 ifeq ($(ARCH),sh64)
 391        SRCARCH := sh
 392 endif
 393
 394 KCONFIG_CONFIG  ?= .config
 395 export KCONFIG_CONFIG
 396
 397 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
 398 export KBUILD_DEFCONFIG := defconfig
 399
 400 # SHELL used by kbuild
 401 CONFIG_SHELL := sh
 402
 403 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 404 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 405 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 406
 407 ifneq ($(LLVM),)
 408 HOSTCC  = clang
 409 HOSTCXX = clang++
 410 else
 411 HOSTCC  = gcc
 412 HOSTCXX = g++
 413 endif
 414
 415 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 416                               -O2 -fomit-frame-pointer -std=gnu89
 417 export KBUILD_USERLDFLAGS :=
 418
 419 KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 420 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 421 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 422 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 423
 424 # Make variables (CC, etc...)
 425 CPP             = $(CC) -E
 426 ifneq ($(LLVM),)
 427 CC              = clang
 428 LD              = ld.lld
 429 AR              = llvm-ar
 430 NM              = llvm-nm
 431 OBJCOPY         = llvm-objcopy
 432 OBJDUMP         = llvm-objdump
 433 READELF         = llvm-readelf
 434 STRIP           = llvm-strip
 435 else
 436 CC              = $(CROSS_COMPILE)gcc
 437 LD              = $(CROSS_COMPILE)ld
 438 AR              = $(CROSS_COMPILE)ar
 439 NM              = $(CROSS_COMPILE)nm
 440 OBJCOPY         = $(CROSS_COMPILE)objcopy
 441 OBJDUMP         = $(CROSS_COMPILE)objdump
 442 READELF         = $(CROSS_COMPILE)readelf
 443 STRIP           = $(CROSS_COMPILE)strip
 444 endif
 445 PAHOLE          = pahole
 446 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 447 LEX             = flex
 448 YACC            = bison
 449 AWK             = awk
 450 INSTALLKERNEL  := installkernel
 451 DEPMOD          = depmod
 452 PERL            = perl
 453 PYTHON3         = python3
 454 CHECK           = sparse
 455 BASH            = bash
 456 KGZIP           = gzip
 457 KBZIP2          = bzip2
 458 KLZOP           = lzop
 459 LZMA            = lzma
 460 LZ4             = lz4c
 461 XZ              = xz
 462 ZSTD            = zstd
 463
 464 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 465                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 466 NOSTDINC_FLAGS :=
 467 CFLAGS_MODULE   =
 468 AFLAGS_MODULE   =
 469 LDFLAGS_MODULE  =
 470 CFLAGS_KERNEL   =
 471 AFLAGS_KERNEL   =
 472 LDFLAGS_vmlinux =
 473
 474 # Use USERINCLUDE when you must reference the UAPI directories only.
 475 USERINCLUDE    := \
 476                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 477                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 478                 -I$(srctree)/include/uapi \
 479                 -I$(objtree)/include/generated/uapi \
 480                 -include $(srctree)/include/linux/kconfig.h
 481
 482 # Use LINUXINCLUDE when you must reference the include/ directory.
 483 # Needed to be compatible with the O= option
 484 LINUXINCLUDE    := \
 485                 -I$(srctree)/arch/$(SRCARCH)/include \
 486                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 487                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 488                 -I$(objtree)/include \
 489                 $(USERINCLUDE)
 490
 491 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 492 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 493                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 494                    -Werror=implicit-function-declaration -Werror=implicit-int \
 495                    -Werror=return-type -Wno-format-security \
 496                    -std=gnu89
 497 KBUILD_CPPFLAGS := -D__KERNEL__
 498 KBUILD_AFLAGS_KERNEL :=
 499 KBUILD_CFLAGS_KERNEL :=
 500 KBUILD_AFLAGS_MODULE  := -DMODULE
 501 KBUILD_CFLAGS_MODULE  := -DMODULE
 502 KBUILD_LDFLAGS_MODULE :=
 503 KBUILD_LDFLAGS :=
 504 CLANG_FLAGS :=
 505
 506 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 507 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 508 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 509 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 510 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 511
 512 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 513 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 514 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 515 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 516 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 517
 518 # Files to ignore in find ... statements
 519
 520 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 521                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 522                           -prune -o
 523 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 524                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 525
 526 # ===========================================================================
 527 # Rules shared between *config targets and build targets
 528
 529 # Basic helpers built in scripts/basic/
 530 PHONY += scripts_basic
 531 scripts_basic:
 532         $(Q)$(MAKE) $(build)=scripts/basic
 533         $(Q)rm -f .tmp_quiet_recordmcount
 534
 535 PHONY += outputmakefile
 536 # Before starting out-of-tree build, make sure the source tree is clean.
 537 # outputmakefile generates a Makefile in the output directory, if using a
 538 # separate output directory. This allows convenient use of make in the
 539 # output directory.
 540 # At the same time when output Makefile generated, generate .gitignore to
 541 # ignore whole output directory
 542 outputmakefile:
 543 ifdef building_out_of_srctree
 544         $(Q)if [ -f $(srctree)/.config -o \
 545                  -d $(srctree)/include/config -o \
 546                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 547                 echo >&2 "***"; \
 548                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 549                 echo >&2 "*** in $(abs_srctree)";\
 550                 echo >&2 "***"; \
 551                 false; \
 552         fi
 553         $(Q)ln -fsn $(srctree) source
 554         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 555         $(Q)test -e .gitignore || \
 556         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 557 endif
 558
 559 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 560 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 561 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 562 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 563 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g')
 564
 565 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 566 ifneq ($(CROSS_COMPILE),)
 567 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 568 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 569 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 570 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 571 endif
 572 ifneq ($(GCC_TOOLCHAIN),)
 573 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 574 endif
 575 ifneq ($(LLVM_IAS),1)
 576 CLANG_FLAGS     += -no-integrated-as
 577 endif
 578 CLANG_FLAGS     += -Werror=unknown-warning-option
 579 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 580 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 581 export CLANG_FLAGS
 582 endif
 583
 584 ifdef config-build
 585 # ===========================================================================
 586 # *config targets only - make sure prerequisites are updated, and descend
 587 # in scripts/kconfig to make the *config target
 588
 589 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 590 # KBUILD_DEFCONFIG may point out an alternative default configuration
 591 # used for 'make defconfig'
 592 include arch/$(SRCARCH)/Makefile
 593 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 594
 595 config: outputmakefile scripts_basic FORCE
 596         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 597
 598 %config: outputmakefile scripts_basic FORCE
 599         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 600
 601 else #!config-build
 602 # ===========================================================================
 603 # Build targets only - this includes vmlinux, arch specific targets, clean
 604 # targets and others. In general all targets except *config targets.
 605
 606 # If building an external module we do not care about the all: rule
 607 # but instead __all depend on modules
 608 PHONY += all
 609 ifeq ($(KBUILD_EXTMOD),)
 610 __all: all
 611 else
 612 __all: modules
 613 endif
 614
 615 # Decide whether to build built-in, modular, or both.
 616 # Normally, just do built-in.
 617
 618 KBUILD_MODULES :=
 619 KBUILD_BUILTIN := 1
 620
 621 # If we have only "make modules", don't compile built-in objects.
 622 ifeq ($(MAKECMDGOALS),modules)
 623   KBUILD_BUILTIN :=
 624 endif
 625
 626 # If we have "make <whatever> modules", compile modules
 627 # in addition to whatever we do anyway.
 628 # Just "make" or "make all" shall build modules as well
 629
 630 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 631   KBUILD_MODULES := 1
 632 endif
 633
 634 ifeq ($(MAKECMDGOALS),)
 635   KBUILD_MODULES := 1
 636 endif
 637
 638 export KBUILD_MODULES KBUILD_BUILTIN
 639
 640 ifdef need-config
 641 include include/config/auto.conf
 642 endif
 643
 644 ifeq ($(KBUILD_EXTMOD),)
 645 # Objects we will link into vmlinux / subdirs we need to visit
 646 core-y          := init/ usr/
 647 drivers-y       := drivers/ sound/
 648 drivers-$(CONFIG_SAMPLES) += samples/
 649 drivers-$(CONFIG_NET) += net/
 650 drivers-y       += virt/
 651 libs-y          := lib/
 652 endif # KBUILD_EXTMOD
 653
 654 # The all: target is the default when no target is given on the
 655 # command line.
 656 # This allow a user to issue only 'make' to build a kernel including modules
 657 # Defaults to vmlinux, but the arch makefile usually adds further targets
 658 all: vmlinux
 659
 660 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 661         $(call cc-option,-fno-tree-loop-im) \
 662         $(call cc-disable-warning,maybe-uninitialized,)
 663 export CFLAGS_GCOV
 664
 665 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 666 ifdef CONFIG_FUNCTION_TRACER
 667   CC_FLAGS_FTRACE := -pg
 668 endif
 669
 670 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 671 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 672 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 673 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 674 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 675 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 676 export RETPOLINE_CFLAGS
 677 export RETPOLINE_VDSO_CFLAGS
 678
 679 include arch/$(SRCARCH)/Makefile
 680
 681 ifdef need-config
 682 ifdef may-sync-config
 683 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 684 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 685 # because some architectures define CROSS_COMPILE there.
 686 include include/config/auto.conf.cmd
 687
 688 $(KCONFIG_CONFIG):
 689         @echo >&2 '***'
 690         @echo >&2 '*** Configuration file "$@" not found!'
 691         @echo >&2 '***'
 692         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 693         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 694         @echo >&2 '***'
 695         @/bin/false
 696
 697 # The actual configuration files used during the build are stored in
 698 # include/generated/ and include/config/. Update them if .config is newer than
 699 # include/config/auto.conf (which mirrors .config).
 700 #
 701 # This exploits the 'multi-target pattern rule' trick.
 702 # The syncconfig should be executed only once to make all the targets.
 703 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 704 quiet_cmd_syncconfig = SYNC    $@
 705       cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
 706
 707 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
 708         +$(call cmd,syncconfig)
 709 else # !may-sync-config
 710 # External modules and some install targets need include/generated/autoconf.h
 711 # and include/config/auto.conf but do not care if they are up-to-date.
 712 # Use auto.conf to trigger the test
 713 PHONY += include/config/auto.conf
 714
 715 include/config/auto.conf:
 716         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 717         echo >&2;                                                       \
 718         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 719         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 720         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 721         echo >&2 ;                                                      \
 722         /bin/false)
 723
 724 endif # may-sync-config
 725 endif # need-config
 726
 727 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 728 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 729 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 730 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 731 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 732
 733 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 734 KBUILD_CFLAGS += -O2
 735 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 736 KBUILD_CFLAGS += -O3
 737 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 738 KBUILD_CFLAGS += -Os
 739 endif
 740
 741 # Tell gcc to never replace conditional load with a non-conditional one
 742 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 743 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 744
 745 ifdef CONFIG_READABLE_ASM
 746 # Disable optimizations that make assembler listings hard to read.
 747 # reorder blocks reorders the control in the function
 748 # ipa clone creates specialized cloned functions
 749 # partial inlining inlines only parts of functions
 750 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 751                  $(call cc-option,-fno-ipa-cp-clone,) \
 752                  $(call cc-option,-fno-partial-inlining)
 753 endif
 754
 755 ifneq ($(CONFIG_FRAME_WARN),0)
 756 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 757 endif
 758
 759 stackp-flags-y                                    := -fno-stack-protector
 760 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 761 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 762
 763 KBUILD_CFLAGS += $(stackp-flags-y)
 764
 765 ifdef CONFIG_CC_IS_CLANG
 766 KBUILD_CPPFLAGS += -Qunused-arguments
 767 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 768 KBUILD_CFLAGS += -Wno-gnu
 769 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 770 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 771 # See modpost pattern 2
 772 KBUILD_CFLAGS += -mno-global-merge
 773 else
 774
 775 # These warnings generated too much noise in a regular build.
 776 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 777 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 778
 779 # Warn about unmarked fall-throughs in switch statement.
 780 # Disabled for clang while comment to attribute conversion happens and
 781 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 782 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 783 endif
 784
 785 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 786 ifdef CONFIG_FRAME_POINTER
 787 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 788 else
 789 # Some targets (ARM with Thumb2, for example), can't be built with frame
 790 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 791 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 792 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 793 # -fomit-frame-pointer with FUNCTION_TRACER.
 794 ifndef CONFIG_FUNCTION_TRACER
 795 KBUILD_CFLAGS   += -fomit-frame-pointer
 796 endif
 797 endif
 798
 799 # Initialize all stack variables with a 0xAA pattern.
 800 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 801 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 802 endif
 803
 804 # Initialize all stack variables with a zero value.
 805 ifdef CONFIG_INIT_STACK_ALL_ZERO
 806 # Future support for zero initialization is still being debated, see
 807 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
 808 # renamed or dropped.
 809 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 810 KBUILD_CFLAGS   += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 811 endif
 812
 813 DEBUG_CFLAGS    :=
 814
 815 # Workaround for GCC versions < 5.0
 816 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
 817 ifdef CONFIG_CC_IS_GCC
 818 DEBUG_CFLAGS    += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
 819 endif
 820
 821 ifdef CONFIG_DEBUG_INFO
 822
 823 ifdef CONFIG_DEBUG_INFO_SPLIT
 824 DEBUG_CFLAGS    += -gsplit-dwarf
 825 else
 826 DEBUG_CFLAGS    += -g
 827 endif
 828
 829 ifneq ($(LLVM_IAS),1)
 830 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 831 endif
 832
 833 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
 834 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
 835 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
 836 DEBUG_CFLAGS    += -gdwarf-$(dwarf-version-y)
 837 endif
 838
 839 ifdef CONFIG_DEBUG_INFO_REDUCED
 840 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 841                    $(call cc-option,-fno-var-tracking)
 842 endif
 843
 844 ifdef CONFIG_DEBUG_INFO_COMPRESSED
 845 DEBUG_CFLAGS    += -gz=zlib
 846 KBUILD_AFLAGS   += -gz=zlib
 847 KBUILD_LDFLAGS  += --compress-debug-sections=zlib
 848 endif
 849
 850 endif # CONFIG_DEBUG_INFO
 851
 852 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 853 export DEBUG_CFLAGS
 854
 855 ifdef CONFIG_FUNCTION_TRACER
 856 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 857   CC_FLAGS_FTRACE       += -mrecord-mcount
 858   ifdef CONFIG_HAVE_NOP_MCOUNT
 859     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 860       CC_FLAGS_FTRACE   += -mnop-mcount
 861       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 862     endif
 863   endif
 864 endif
 865 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 866   CC_FLAGS_USING        += -DCC_USING_NOP_MCOUNT
 867 endif
 868 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 869   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 870     BUILD_C_RECORDMCOUNT := y
 871     export BUILD_C_RECORDMCOUNT
 872   endif
 873 endif
 874 ifdef CONFIG_HAVE_FENTRY
 875   ifeq ($(call cc-option-yn, -mfentry),y)
 876     CC_FLAGS_FTRACE     += -mfentry
 877     CC_FLAGS_USING      += -DCC_USING_FENTRY
 878   endif
 879 endif
 880 export CC_FLAGS_FTRACE
 881 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 882 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 883 endif
 884
 885 # We trigger additional mismatches with less inlining
 886 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 887 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 888 endif
 889
 890 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 891 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 892 LDFLAGS_vmlinux += --gc-sections
 893 endif
 894
 895 ifdef CONFIG_SHADOW_CALL_STACK
 896 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 897 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 898 export CC_FLAGS_SCS
 899 endif
 900
 901 ifdef CONFIG_LTO_CLANG
 902 ifdef CONFIG_LTO_CLANG_THIN
 903 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 904 KBUILD_LDFLAGS  += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache
 905 else
 906 CC_FLAGS_LTO    := -flto
 907 endif
 908 CC_FLAGS_LTO    += -fvisibility=hidden
 909
 910 # Limit inlining across translation units to reduce binary size
 911 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 912 endif
 913
 914 ifdef CONFIG_LTO
 915 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
 916 KBUILD_AFLAGS   += -fno-lto
 917 export CC_FLAGS_LTO
 918 endif
 919
 920 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
 921 KBUILD_CFLAGS += -falign-functions=32
 922 endif
 923
 924 # arch Makefile may override CC so keep this after arch Makefile is included
 925 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 926
 927 # warn about C99 declaration after statement
 928 KBUILD_CFLAGS += -Wdeclaration-after-statement
 929
 930 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 931 KBUILD_CFLAGS += -Wvla
 932
 933 # disable pointer signed / unsigned warnings in gcc 4.0
 934 KBUILD_CFLAGS += -Wno-pointer-sign
 935
 936 # disable stringop warnings in gcc 8+
 937 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 938
 939 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 940 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 941 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 942 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 943
 944 # Another good warning that we'll want to enable eventually
 945 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 946
 947 # Enabled with W=2, disabled by default as noisy
 948 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 949
 950 # disable invalid "can't wrap" optimizations for signed / pointers
 951 KBUILD_CFLAGS   += -fno-strict-overflow
 952
 953 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 954 KBUILD_CFLAGS  += -fno-stack-check
 955
 956 # conserve stack if available
 957 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 958
 959 # Prohibit date/time macros, which would make the build non-deterministic
 960 KBUILD_CFLAGS   += -Werror=date-time
 961
 962 # enforce correct pointer usage
 963 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 964
 965 # Require designated initializers for all marked structures
 966 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 967
 968 # change __FILE__ to the relative path from the srctree
 969 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 970
 971 # include additional Makefiles when needed
 972 include-y                       := scripts/Makefile.extrawarn
 973 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
 974 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
 975 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
 976 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
 977 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
 978
 979 include $(addprefix $(srctree)/, $(include-y))
 980
 981 # scripts/Makefile.gcc-plugins is intentionally included last.
 982 # Do not add $(call cc-option,...) below this line. When you build the kernel
 983 # from the clean source tree, the GCC plugins do not exist at this point.
 984
 985 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 986 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 987 KBUILD_AFLAGS   += $(KAFLAGS)
 988 KBUILD_CFLAGS   += $(KCFLAGS)
 989
 990 KBUILD_LDFLAGS_MODULE += --build-id=sha1
 991 LDFLAGS_vmlinux += --build-id=sha1
 992
 993 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 994 LDFLAGS_vmlinux += $(call ld-option, -X,)
 995 endif
 996
 997 ifeq ($(CONFIG_RELR),y)
 998 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
 999 endif
1000
1001 # We never want expected sections to be placed heuristically by the
1002 # linker. All sections should be explicitly named in the linker script.
1003 ifdef CONFIG_LD_ORPHAN_WARN
1004 LDFLAGS_vmlinux += --orphan-handling=warn
1005 endif
1006
1007 # Align the bit size of userspace programs with the kernel
1008 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1009 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1010
1011 # make the checker run with the right architecture
1012 CHECKFLAGS += --arch=$(ARCH)
1013
1014 # insure the checker run with the right endianness
1015 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1016
1017 # the checker needs the correct machine size
1018 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1019
1020 # Default kernel image to build when no specific target is given.
1021 # KBUILD_IMAGE may be overruled on the command line or
1022 # set in the environment
1023 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1024 # this default value
1025 export KBUILD_IMAGE ?= vmlinux
1026
1027 #
1028 # INSTALL_PATH specifies where to place the updated kernel and system map
1029 # images. Default is /boot, but you can set it to other values
1030 export  INSTALL_PATH ?= /boot
1031
1032 #
1033 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1034 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1035 # an argument if needed. Otherwise it defaults to the kernel install path
1036 #
1037 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1038
1039 #
1040 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1041 # relocations required by build roots.  This is not defined in the
1042 # makefile but the argument can be passed to make if needed.
1043 #
1044
1045 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1046 export MODLIB
1047
1048 #
1049 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1050 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
1051 # the default option --strip-debug will be used.  Otherwise,
1052 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1053
1054 ifdef INSTALL_MOD_STRIP
1055 ifeq ($(INSTALL_MOD_STRIP),1)
1056 mod_strip_cmd = $(STRIP) --strip-debug
1057 else
1058 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1059 endif # INSTALL_MOD_STRIP=1
1060 else
1061 mod_strip_cmd = true
1062 endif # INSTALL_MOD_STRIP
1063 export mod_strip_cmd
1064
1065 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1066 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1067 # or CONFIG_MODULE_COMPRESS_XZ.
1068
1069 mod_compress_cmd = true
1070 ifdef CONFIG_MODULE_COMPRESS
1071   ifdef CONFIG_MODULE_COMPRESS_GZIP
1072     mod_compress_cmd = $(KGZIP) -n -f
1073   endif # CONFIG_MODULE_COMPRESS_GZIP
1074   ifdef CONFIG_MODULE_COMPRESS_XZ
1075     mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
1076   endif # CONFIG_MODULE_COMPRESS_XZ
1077 endif # CONFIG_MODULE_COMPRESS
1078 export mod_compress_cmd
1079
1080 ifdef CONFIG_MODULE_SIG_ALL
1081 $(eval $(call config_filename,MODULE_SIG_KEY))
1082
1083 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1084 else
1085 mod_sign_cmd = true
1086 endif
1087 export mod_sign_cmd
1088
1089 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1090
1091 has_libelf = $(call try-run,\
1092                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1093
1094 ifdef CONFIG_STACK_VALIDATION
1095   ifeq ($(has_libelf),1)
1096     objtool_target := tools/objtool FORCE
1097   else
1098     SKIP_STACK_VALIDATION := 1
1099     export SKIP_STACK_VALIDATION
1100   endif
1101 endif
1102
1103 PHONY += resolve_btfids_clean
1104
1105 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1106
1107 # tools/bpf/resolve_btfids directory might not exist
1108 # in output directory, skip its clean in that case
1109 resolve_btfids_clean:
1110 ifneq ($(wildcard $(resolve_btfids_O)),)
1111         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1112 endif
1113
1114 ifdef CONFIG_BPF
1115 ifdef CONFIG_DEBUG_INFO_BTF
1116   ifeq ($(has_libelf),1)
1117     resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1118   else
1119     ERROR_RESOLVE_BTFIDS := 1
1120   endif
1121 endif # CONFIG_DEBUG_INFO_BTF
1122 endif # CONFIG_BPF
1123
1124 PHONY += prepare0
1125
1126 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1127 export MODORDER := $(extmod-prefix)modules.order
1128 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1129
1130 ifeq ($(KBUILD_EXTMOD),)
1131 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1132
1133 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, \
1134                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1135                      $(libs-y) $(libs-m)))
1136
1137 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1138                      $(patsubst %/,%,$(filter %/, $(core-) \
1139                         $(drivers-) $(libs-))))
1140
1141 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1142                         $(core-y) $(core-m) $(libs-y) $(libs-m) \
1143                         $(drivers-y) $(drivers-m)))
1144
1145 build-dirs      := $(vmlinux-dirs)
1146 clean-dirs      := $(vmlinux-alldirs)
1147
1148 # Externally visible symbols (used by link-vmlinux.sh)
1149 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1150 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1151 ifdef CONFIG_MODULES
1152 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1153 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1154 else
1155 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1156 endif
1157 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1158
1159 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1160 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1161 # used by scripts/Makefile.package
1162 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1163
1164 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1165
1166 # Recurse until adjust_autoksyms.sh is satisfied
1167 PHONY += autoksyms_recursive
1168 ifdef CONFIG_TRIM_UNUSED_KSYMS
1169 # For the kernel to actually contain only the needed exported symbols,
1170 # we have to build modules as well to determine what those symbols are.
1171 # (this can be evaluated only once include/config/auto.conf has been included)
1172 KBUILD_MODULES := 1
1173
1174 autoksyms_recursive: descend modules.order
1175         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1176           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1177 endif
1178
1179 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1180
1181 quiet_cmd_autoksyms_h = GEN     $@
1182       cmd_autoksyms_h = mkdir -p $(dir $@); \
1183                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1184
1185 $(autoksyms_h):
1186         $(call cmd,autoksyms_h)
1187
1188 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1189
1190 # Final link of vmlinux with optional arch pass after final link
1191 cmd_link-vmlinux =                                                 \
1192         $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1193         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1194
1195 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1196         +$(call if_changed,link-vmlinux)
1197
1198 targets := vmlinux
1199
1200 # The actual objects are generated when descending,
1201 # make sure no implicit rule kicks in
1202 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1203
1204 filechk_kernel.release = \
1205         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1206
1207 # Store (new) KERNELRELEASE string in include/config/kernel.release
1208 include/config/kernel.release: FORCE
1209         $(call filechk,kernel.release)
1210
1211 # Additional helpers built in scripts/
1212 # Carefully list dependencies so we do not try to build scripts twice
1213 # in parallel
1214 PHONY += scripts
1215 scripts: scripts_basic scripts_dtc
1216         $(Q)$(MAKE) $(build)=$(@)
1217
1218 # Things we need to do before we recursively start building the kernel
1219 # or the modules are listed in "prepare".
1220 # A multi level approach is used. prepareN is processed before prepareN-1.
1221 # archprepare is used in arch Makefiles and when processed asm symlink,
1222 # version.h and scripts_basic is processed / created.
1223
1224 PHONY += prepare archprepare
1225
1226 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1227         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1228         include/generated/autoconf.h
1229
1230 prepare0: archprepare
1231         $(Q)$(MAKE) $(build)=scripts/mod
1232         $(Q)$(MAKE) $(build)=.
1233
1234 # All the preparing..
1235 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1236
1237 # Support for using generic headers in asm-generic
1238 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1239
1240 PHONY += asm-generic uapi-asm-generic
1241 asm-generic: uapi-asm-generic
1242         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1243         generic=include/asm-generic
1244 uapi-asm-generic:
1245         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1246         generic=include/uapi/asm-generic
1247
1248 PHONY += prepare-objtool prepare-resolve_btfids
1249 prepare-objtool: $(objtool_target)
1250 ifeq ($(SKIP_STACK_VALIDATION),1)
1251 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1252         @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1253         @false
1254 endif
1255 ifdef CONFIG_UNWINDER_ORC
1256         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1257         @false
1258 else
1259         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1260 endif
1261 endif
1262
1263 prepare-resolve_btfids: $(resolve_btfids_target)
1264 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1265         @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1266         @false
1267 endif
1268 # Generate some files
1269 # ---------------------------------------------------------------------------
1270
1271 # KERNELRELEASE can change from a few different places, meaning version.h
1272 # needs to be updated, so this check is forced on all builds
1273
1274 uts_len := 64
1275 define filechk_utsrelease.h
1276         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1277           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1278           exit 1;                                                         \
1279         fi;                                                               \
1280         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1281 endef
1282
1283 define filechk_version.h
1284         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1285                 echo \#define LINUX_VERSION_CODE $(shell                 \
1286                 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
1287         else                                                             \
1288                 echo \#define LINUX_VERSION_CODE $(shell                 \
1289                 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1290         fi;                                                              \
1291         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1292         ((c) > 255 ? 255 : (c)))';                                       \
1293         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1294         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1295         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1296 endef
1297
1298 $(version_h): FORCE
1299         $(call filechk,version.h)
1300
1301 include/generated/utsrelease.h: include/config/kernel.release FORCE
1302         $(call filechk,utsrelease.h)
1303
1304 PHONY += headerdep
1305 headerdep:
1306         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1307         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1308
1309 # ---------------------------------------------------------------------------
1310 # Kernel headers
1311
1312 #Default location for installed headers
1313 export INSTALL_HDR_PATH = $(objtree)/usr
1314
1315 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1316       cmd_headers_install = \
1317         mkdir -p $(INSTALL_HDR_PATH); \
1318         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1319         usr/include $(INSTALL_HDR_PATH)
1320
1321 PHONY += headers_install
1322 headers_install: headers
1323         $(call cmd,headers_install)
1324
1325 PHONY += archheaders archscripts
1326
1327 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1328
1329 PHONY += headers
1330 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1331         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1332           $(error Headers not exportable for the $(SRCARCH) architecture))
1333         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1334         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1335
1336 # Deprecated. It is no-op now.
1337 PHONY += headers_check
1338 headers_check:
1339         @:
1340
1341 ifdef CONFIG_HEADERS_INSTALL
1342 prepare: headers
1343 endif
1344
1345 PHONY += scripts_unifdef
1346 scripts_unifdef: scripts_basic
1347         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1348
1349 # ---------------------------------------------------------------------------
1350 # Kernel selftest
1351
1352 PHONY += kselftest
1353 kselftest:
1354         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1355
1356 kselftest-%: FORCE
1357         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1358
1359 PHONY += kselftest-merge
1360 kselftest-merge:
1361         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1362         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1363                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1364         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1365
1366 # ---------------------------------------------------------------------------
1367 # Devicetree files
1368
1369 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1370 dtstree := arch/$(SRCARCH)/boot/dts
1371 endif
1372
1373 ifneq ($(dtstree),)
1374
1375 %.dtb: include/config/kernel.release scripts_dtc
1376         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1377
1378 %.dtbo: include/config/kernel.release scripts_dtc
1379         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1380
1381 PHONY += dtbs dtbs_install dtbs_check
1382 dtbs: include/config/kernel.release scripts_dtc
1383         $(Q)$(MAKE) $(build)=$(dtstree)
1384
1385 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1386 export CHECK_DTBS=y
1387 dtbs: dt_binding_check
1388 endif
1389
1390 dtbs_check: dtbs
1391
1392 dtbs_install:
1393         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1394
1395 ifdef CONFIG_OF_EARLY_FLATTREE
1396 all: dtbs
1397 endif
1398
1399 endif
1400
1401 PHONY += scripts_dtc
1402 scripts_dtc: scripts_basic
1403         $(Q)$(MAKE) $(build)=scripts/dtc
1404
1405 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1406 export CHECK_DT_BINDING=y
1407 endif
1408
1409 PHONY += dt_binding_check
1410 dt_binding_check: scripts_dtc
1411         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1412
1413 # ---------------------------------------------------------------------------
1414 # Modules
1415
1416 ifdef CONFIG_MODULES
1417
1418 # By default, build modules as well
1419
1420 all: modules
1421
1422 # When we're building modules with modversions, we need to consider
1423 # the built-in objects during the descend as well, in order to
1424 # make sure the checksums are up to date before we record them.
1425 ifdef CONFIG_MODVERSIONS
1426   KBUILD_BUILTIN := 1
1427 endif
1428
1429 # Build modules
1430 #
1431 # A module can be listed more than once in obj-m resulting in
1432 # duplicate lines in modules.order files.  Those are removed
1433 # using awk while concatenating to the final file.
1434
1435 PHONY += modules
1436 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1437         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1438
1439 PHONY += modules_check
1440 modules_check: modules.order
1441         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1442
1443 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1444
1445 modules.order: $(subdir-modorder) FORCE
1446         $(call if_changed,modules_order)
1447
1448 targets += modules.order
1449
1450 # Target to prepare building external modules
1451 PHONY += modules_prepare
1452 modules_prepare: prepare
1453         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1454
1455 # Target to install modules
1456 PHONY += modules_install
1457 modules_install: _modinst_ _modinst_post
1458
1459 PHONY += _modinst_
1460 _modinst_:
1461         @rm -rf $(MODLIB)/kernel
1462         @rm -f $(MODLIB)/source
1463         @mkdir -p $(MODLIB)/kernel
1464         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1465         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1466                 rm -f $(MODLIB)/build ; \
1467                 ln -s $(CURDIR) $(MODLIB)/build ; \
1468         fi
1469         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1470         @cp -f modules.builtin $(MODLIB)/
1471         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1472         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1473
1474 # This depmod is only for convenience to give the initial
1475 # boot a modules.dep even before / is mounted read-write.  However the
1476 # boot script depmod is the master version.
1477 PHONY += _modinst_post
1478 _modinst_post: _modinst_
1479         $(call cmd,depmod)
1480
1481 ifeq ($(CONFIG_MODULE_SIG), y)
1482 PHONY += modules_sign
1483 modules_sign:
1484         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1485 endif
1486
1487 else # CONFIG_MODULES
1488
1489 # Modules not configured
1490 # ---------------------------------------------------------------------------
1491
1492 PHONY += modules modules_install
1493 modules modules_install:
1494         @echo >&2
1495         @echo >&2 "The present kernel configuration has modules disabled."
1496         @echo >&2 "Type 'make config' and enable loadable module support."
1497         @echo >&2 "Then build a kernel with module support enabled."
1498         @echo >&2
1499         @exit 1
1500
1501 endif # CONFIG_MODULES
1502
1503 ###
1504 # Cleaning is done on three levels.
1505 # make clean     Delete most generated files
1506 #                Leave enough to build external modules
1507 # make mrproper  Delete the current configuration, and all generated files
1508 # make distclean Remove editor backup files, patch leftover files and the like
1509
1510 # Directories & files removed with 'make clean'
1511 CLEAN_FILES += include/ksym vmlinux.symvers \
1512                modules.builtin modules.builtin.modinfo modules.nsdeps \
1513                compile_commands.json
1514
1515 # Directories & files removed with 'make mrproper'
1516 MRPROPER_FILES += include/config include/generated          \
1517                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1518                   debian snap tar-install \
1519                   .config .config.old .version \
1520                   Module.symvers \
1521                   signing_key.pem signing_key.priv signing_key.x509     \
1522                   x509.genkey extra_certificates signing_key.x509.keyid \
1523                   signing_key.x509.signer vmlinux-gdb.py \
1524                   *.spec
1525
1526 # Directories & files removed with 'make distclean'
1527 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS .thinlto-cache
1528
1529 # clean - Delete most, but leave enough to build external modules
1530 #
1531 clean: rm-files := $(CLEAN_FILES)
1532
1533 PHONY += archclean vmlinuxclean
1534
1535 vmlinuxclean:
1536         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1537         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1538
1539 clean: archclean vmlinuxclean resolve_btfids_clean
1540
1541 # mrproper - Delete all generated files, including .config
1542 #
1543 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1544 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1545
1546 PHONY += $(mrproper-dirs) mrproper
1547 $(mrproper-dirs):
1548         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1549
1550 mrproper: clean $(mrproper-dirs)
1551         $(call cmd,rmfiles)
1552
1553 # distclean
1554 #
1555 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1556
1557 PHONY += distclean
1558
1559 distclean: mrproper
1560         $(call cmd,rmfiles)
1561         @find $(srctree) $(RCS_FIND_IGNORE) \
1562                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1563                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1564                 -o -name 'core' \) \
1565                 -type f -print | xargs rm -f
1566
1567
1568 # Packaging of the kernel to various formats
1569 # ---------------------------------------------------------------------------
1570
1571 %src-pkg: FORCE
1572         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1573 %pkg: include/config/kernel.release FORCE
1574         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1575
1576 # Brief documentation of the typical targets used
1577 # ---------------------------------------------------------------------------
1578
1579 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1580 boards := $(sort $(notdir $(boards)))
1581 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1582 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1583
1584 PHONY += help
1585 help:
1586         @echo  'Cleaning targets:'
1587         @echo  '  clean           - Remove most generated files but keep the config and'
1588         @echo  '                    enough build support to build external modules'
1589         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1590         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1591         @echo  ''
1592         @echo  'Configuration targets:'
1593         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1594         @echo  ''
1595         @echo  'Other generic targets:'
1596         @echo  '  all             - Build all targets marked with [*]'
1597         @echo  '* vmlinux         - Build the bare kernel'
1598         @echo  '* modules         - Build all modules'
1599         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1600         @echo  '  dir/            - Build all files in dir and below'
1601         @echo  '  dir/file.[ois]  - Build specified target only'
1602         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1603         @echo  '                    (requires compiler support for LLVM assembly generation)'
1604         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1605         @echo  '                    (requires a recent binutils and recent build (System.map))'
1606         @echo  '  dir/file.ko     - Build module including final link'
1607         @echo  '  modules_prepare - Set up for building external modules'
1608         @echo  '  tags/TAGS       - Generate tags file for editors'
1609         @echo  '  cscope          - Generate cscope index'
1610         @echo  '  gtags           - Generate GNU GLOBAL index'
1611         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1612         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1613         @echo  '  image_name      - Output the image name (use with make -s)'
1614         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1615          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1616          echo  ''
1617         @echo  'Static analysers:'
1618         @echo  '  checkstack      - Generate a list of stack hogs'
1619         @echo  '  versioncheck    - Sanity check on version.h usage'
1620         @echo  '  includecheck    - Check for duplicate included header files'
1621         @echo  '  export_report   - List the usages of all exported symbols'
1622         @echo  '  headerdep       - Detect inclusion cycles in headers'
1623         @echo  '  coccicheck      - Check with Coccinelle'
1624         @echo  '  clang-analyzer  - Check with clang static analyzer'
1625         @echo  '  clang-tidy      - Check with clang-tidy'
1626         @echo  ''
1627         @echo  'Tools:'
1628         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1629         @echo  ''
1630         @echo  'Kernel selftest:'
1631         @echo  '  kselftest         - Build and run kernel selftest'
1632         @echo  '                      Build, install, and boot kernel before'
1633         @echo  '                      running kselftest on it'
1634         @echo  '                      Run as root for full coverage'
1635         @echo  '  kselftest-all     - Build kernel selftest'
1636         @echo  '  kselftest-install - Build and install kernel selftest'
1637         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1638         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1639         @echo  '                      kselftest to existing .config.'
1640         @echo  ''
1641         @$(if $(dtstree), \
1642                 echo 'Devicetree:'; \
1643                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1644                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1645                 echo '  dt_binding_check - Validate device tree binding documents'; \
1646                 echo '  dtbs_check       - Validate device tree source files';\
1647                 echo '')
1648
1649         @echo 'Userspace tools targets:'
1650         @echo '  use "make tools/help"'
1651         @echo '  or  "cd tools; make help"'
1652         @echo  ''
1653         @echo  'Kernel packaging:'
1654         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1655         @echo  ''
1656         @echo  'Documentation targets:'
1657         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1658         @echo  ''
1659         @echo  'Architecture specific targets ($(SRCARCH)):'
1660         @$(if $(archhelp),$(archhelp),\
1661                 echo '  No architecture specific help defined for $(SRCARCH)')
1662         @echo  ''
1663         @$(if $(boards), \
1664                 $(foreach b, $(boards), \
1665                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1666                 echo '')
1667         @$(if $(board-dirs), \
1668                 $(foreach b, $(board-dirs), \
1669                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1670                 printf "  %-16s - Show all of the above\\n" help-boards; \
1671                 echo '')
1672
1673         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1674         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1675         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1676         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1677         @echo  '                       (sparse by default)'
1678         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1679         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1680         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1681         @echo  '                1: warnings which may be relevant and do not occur too often'
1682         @echo  '                2: warnings which occur quite often but may still be relevant'
1683         @echo  '                3: more obscure warnings, can most likely be ignored'
1684         @echo  '                Multiple levels can be combined with W=12 or W=123'
1685         @echo  ''
1686         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1687         @echo  'For further info see the ./README file'
1688
1689
1690 help-board-dirs := $(addprefix help-,$(board-dirs))
1691
1692 help-boards: $(help-board-dirs)
1693
1694 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1695
1696 $(help-board-dirs): help-%:
1697         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1698         @$(if $(boards-per-dir), \
1699                 $(foreach b, $(boards-per-dir), \
1700                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1701                 echo '')
1702
1703
1704 # Documentation targets
1705 # ---------------------------------------------------------------------------
1706 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1707                linkcheckdocs dochelp refcheckdocs
1708 PHONY += $(DOC_TARGETS)
1709 $(DOC_TARGETS):
1710         $(Q)$(MAKE) $(build)=Documentation $@
1711
1712 # Misc
1713 # ---------------------------------------------------------------------------
1714
1715 PHONY += scripts_gdb
1716 scripts_gdb: prepare0
1717         $(Q)$(MAKE) $(build)=scripts/gdb
1718         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1719
1720 ifdef CONFIG_GDB_SCRIPTS
1721 all: scripts_gdb
1722 endif
1723
1724 else # KBUILD_EXTMOD
1725
1726 ###
1727 # External module support.
1728 # When building external modules the kernel used as basis is considered
1729 # read-only, and no consistency checks are made and the make
1730 # system is not used on the basis kernel. If updates are required
1731 # in the basis kernel ordinary make commands (without M=...) must
1732 # be used.
1733 #
1734 # The following are the only valid targets when building external
1735 # modules.
1736 # make M=dir clean     Delete all automatically generated files
1737 # make M=dir modules   Make all modules in specified dir
1738 # make M=dir           Same as 'make M=dir modules'
1739 # make M=dir modules_install
1740 #                      Install the modules built in the module directory
1741 #                      Assumes install directory is already created
1742
1743 # We are always building only modules.
1744 KBUILD_BUILTIN :=
1745 KBUILD_MODULES := 1
1746
1747 build-dirs := $(KBUILD_EXTMOD)
1748 PHONY += modules
1749 modules: $(MODORDER)
1750         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1751
1752 $(MODORDER): descend
1753         @:
1754
1755 PHONY += modules_install
1756 modules_install: _emodinst_ _emodinst_post
1757
1758 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1759 PHONY += _emodinst_
1760 _emodinst_:
1761         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1762         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1763
1764 PHONY += _emodinst_post
1765 _emodinst_post: _emodinst_
1766         $(call cmd,depmod)
1767
1768 compile_commands.json: $(extmod-prefix)compile_commands.json
1769 PHONY += compile_commands.json
1770
1771 clean-dirs := $(KBUILD_EXTMOD)
1772 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1773         $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1774
1775 PHONY += help
1776 help:
1777         @echo  '  Building external modules.'
1778         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1779         @echo  ''
1780         @echo  '  modules         - default target, build the module(s)'
1781         @echo  '  modules_install - install the module'
1782         @echo  '  clean           - remove generated files in module directory only'
1783         @echo  ''
1784
1785 # no-op for external module builds
1786 PHONY += prepare modules_prepare
1787
1788 endif # KBUILD_EXTMOD
1789
1790 # Single targets
1791 # ---------------------------------------------------------------------------
1792 # To build individual files in subdirectories, you can do like this:
1793 #
1794 #   make foo/bar/baz.s
1795 #
1796 # The supported suffixes for single-target are listed in 'single-targets'
1797 #
1798 # To build only under specific subdirectories, you can do like this:
1799 #
1800 #   make foo/bar/baz/
1801
1802 ifdef single-build
1803
1804 # .ko is special because modpost is needed
1805 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1806 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1807
1808 $(single-ko): single_modpost
1809         @:
1810 $(single-no-ko): descend
1811         @:
1812
1813 ifeq ($(KBUILD_EXTMOD),)
1814 # For the single build of in-tree modules, use a temporary file to avoid
1815 # the situation of modules_install installing an invalid modules.order.
1816 MODORDER := .modules.tmp
1817 endif
1818
1819 PHONY += single_modpost
1820 single_modpost: $(single-no-ko) modules_prepare
1821         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1822         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1823
1824 KBUILD_MODULES := 1
1825
1826 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1827
1828 # trim unrelated directories
1829 build-dirs := $(foreach d, $(build-dirs), \
1830                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1831
1832 endif
1833
1834 ifndef CONFIG_MODULES
1835 KBUILD_MODULES :=
1836 endif
1837
1838 # Handle descending into subdirectories listed in $(build-dirs)
1839 # Preset locale variables to speed up the build process. Limit locale
1840 # tweaks to this spot to avoid wrong language settings when running
1841 # make menuconfig etc.
1842 # Error messages still appears in the original language
1843 PHONY += descend $(build-dirs)
1844 descend: $(build-dirs)
1845 $(build-dirs): prepare
1846         $(Q)$(MAKE) $(build)=$@ \
1847         single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1848         need-builtin=1 need-modorder=1
1849
1850 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1851 PHONY += $(clean-dirs) clean
1852 $(clean-dirs):
1853         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1854
1855 clean: $(clean-dirs)
1856         $(call cmd,rmfiles)
1857         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1858                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1859                 -o -name '*.ko.*' \
1860                 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1861                 -o -name '*.dwo' -o -name '*.lst' \
1862                 -o -name '*.su' -o -name '*.mod' \
1863                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1864                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1865                 -o -name '*.asn1.[ch]' \
1866                 -o -name '*.symtypes' -o -name 'modules.order' \
1867                 -o -name '.tmp_*.o.*' \
1868                 -o -name '*.c.[012]*.*' \
1869                 -o -name '*.ll' \
1870                 -o -name '*.gcno' \
1871                 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1872
1873 # Generate tags for editors
1874 # ---------------------------------------------------------------------------
1875 quiet_cmd_tags = GEN     $@
1876       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1877
1878 tags TAGS cscope gtags: FORCE
1879         $(call cmd,tags)
1880
1881 # Script to generate missing namespace dependencies
1882 # ---------------------------------------------------------------------------
1883
1884 PHONY += nsdeps
1885 nsdeps: export KBUILD_NSDEPS=1
1886 nsdeps: modules
1887         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1888
1889 # Clang Tooling
1890 # ---------------------------------------------------------------------------
1891
1892 quiet_cmd_gen_compile_commands = GEN     $@
1893       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1894
1895 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1896         $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1897         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1898         $(call if_changed,gen_compile_commands)
1899
1900 targets += $(extmod-prefix)compile_commands.json
1901
1902 PHONY += clang-tidy clang-analyzer
1903
1904 ifdef CONFIG_CC_IS_CLANG
1905 quiet_cmd_clang_tools = CHECK   $<
1906       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1907
1908 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1909         $(call cmd,clang_tools)
1910 else
1911 clang-tidy clang-analyzer:
1912         @echo "$@ requires CC=clang" >&2
1913         @false
1914 endif
1915
1916 # Scripts to check various things for consistency
1917 # ---------------------------------------------------------------------------
1918
1919 PHONY += includecheck versioncheck coccicheck export_report
1920
1921 includecheck:
1922         find $(srctree)/* $(RCS_FIND_IGNORE) \
1923                 -name '*.[hcS]' -type f -print | sort \
1924                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1925
1926 versioncheck:
1927         find $(srctree)/* $(RCS_FIND_IGNORE) \
1928                 -name '*.[hcS]' -type f -print | sort \
1929                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1930
1931 coccicheck:
1932         $(Q)$(BASH) $(srctree)/scripts/$@
1933
1934 export_report:
1935         $(PERL) $(srctree)/scripts/export_report.pl
1936
1937 PHONY += checkstack kernelrelease kernelversion image_name
1938
1939 # UML needs a little special treatment here.  It wants to use the host
1940 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1941 # else wants $(ARCH), including people doing cross-builds, which means
1942 # that $(SUBARCH) doesn't work here.
1943 ifeq ($(ARCH), um)
1944 CHECKSTACK_ARCH := $(SUBARCH)
1945 else
1946 CHECKSTACK_ARCH := $(ARCH)
1947 endif
1948 checkstack:
1949         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1950         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1951
1952 kernelrelease:
1953         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1954
1955 kernelversion:
1956         @echo $(KERNELVERSION)
1957
1958 image_name:
1959         @echo $(KBUILD_IMAGE)
1960
1961 # Clear a bunch of variables before executing the submake
1962
1963 ifeq ($(quiet),silent_)
1964 tools_silent=s
1965 endif
1966
1967 tools/: FORCE
1968         $(Q)mkdir -p $(objtree)/tools
1969         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1970
1971 tools/%: FORCE
1972         $(Q)mkdir -p $(objtree)/tools
1973         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1974
1975 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1976       cmd_rmfiles = rm -rf $(rm-files)
1977
1978 # Run depmod only if we have System.map and depmod is executable
1979 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1980       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1981                    $(KERNELRELEASE)
1982
1983 # read saved command lines for existing targets
1984 existing-targets := $(wildcard $(sort $(targets)))
1985
1986 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1987
1988 endif # config-build
1989 endif # mixed-build
1990 endif # need-sub-make
1991
1992 PHONY += FORCE
1993 FORCE:
1994
1995 # Declare the contents of the PHONY variable as phony.  We keep that
1996 # information in a variable so we can use it in if_changed and friends.
1997 .PHONY: $(PHONY)