Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 11
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc5
   6 NAME = Kleptomaniac Octopus
   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 --%,$(MAKEFLAGS))),)
  98   quiet=silent_
  99 endif
 100
 101 export quiet Q KBUILD_VERBOSE
 102
 103 # Kbuild will save output files in the current working directory.
 104 # This does not need to match to the root of the kernel source tree.
 105 #
 106 # For example, you can do this:
 107 #
 108 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 109 #
 110 # If you want to save output files in a different location, there are
 111 # two syntaxes to specify it.
 112 #
 113 # 1) O=
 114 # Use "make O=dir/to/store/output/files/"
 115 #
 116 # 2) Set KBUILD_OUTPUT
 117 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 118 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 119 #
 120 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 121 # variable.
 122
 123 # Do we want to change the working directory?
 124 ifeq ("$(origin O)", "command line")
 125   KBUILD_OUTPUT := $(O)
 126 endif
 127
 128 ifneq ($(KBUILD_OUTPUT),)
 129 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 130 # expand a shell special character '~'. We use a somewhat tedious way here.
 131 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 132 $(if $(abs_objtree),, \
 133      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 134
 135 # $(realpath ...) resolves symlinks
 136 abs_objtree := $(realpath $(abs_objtree))
 137 else
 138 abs_objtree := $(CURDIR)
 139 endif # ifneq ($(KBUILD_OUTPUT),)
 140
 141 ifeq ($(abs_objtree),$(CURDIR))
 142 # Suppress "Entering directory ..." unless we are changing the work directory.
 143 MAKEFLAGS += --no-print-directory
 144 else
 145 need-sub-make := 1
 146 endif
 147
 148 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 149
 150 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 151 $(error source directory cannot contain spaces or colons)
 152 endif
 153
 154 ifneq ($(abs_srctree),$(abs_objtree))
 155 # Look for make include files relative to root of kernel src
 156 #
 157 # This does not become effective immediately because MAKEFLAGS is re-parsed
 158 # once after the Makefile is read. We need to invoke sub-make.
 159 MAKEFLAGS += --include-dir=$(abs_srctree)
 160 need-sub-make := 1
 161 endif
 162
 163 this-makefile := $(lastword $(MAKEFILE_LIST))
 164
 165 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 166 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 167 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 168 need-sub-make := 1
 169 # Cancel implicit rules for this Makefile.
 170 $(this-makefile): ;
 171 endif
 172
 173 export abs_srctree abs_objtree
 174 export sub_make_done := 1
 175
 176 ifeq ($(need-sub-make),1)
 177
 178 PHONY += $(MAKECMDGOALS) __sub-make
 179
 180 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 181         @:
 182
 183 # Invoke a second make in the output directory, passing relevant variables
 184 __sub-make:
 185         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 186
 187 endif # need-sub-make
 188 endif # sub_make_done
 189
 190 # We process the rest of the Makefile if this is the final invocation of make
 191 ifeq ($(need-sub-make),)
 192
 193 # Do not print "Entering directory ...",
 194 # but we want to display it when entering to the output directory
 195 # so that IDEs/editors are able to understand relative filenames.
 196 MAKEFLAGS += --no-print-directory
 197
 198 # Call a source code checker (by default, "sparse") as part of the
 199 # C compilation.
 200 #
 201 # Use 'make C=1' to enable checking of only re-compiled files.
 202 # Use 'make C=2' to enable checking of *all* source files, regardless
 203 # of whether they are re-compiled or not.
 204 #
 205 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 206 # including where to get the "sparse" utility.
 207
 208 ifeq ("$(origin C)", "command line")
 209   KBUILD_CHECKSRC = $(C)
 210 endif
 211 ifndef KBUILD_CHECKSRC
 212   KBUILD_CHECKSRC = 0
 213 endif
 214
 215 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 216 # directory of external module to build. Setting M= takes precedence.
 217 ifeq ("$(origin M)", "command line")
 218   KBUILD_EXTMOD := $(M)
 219 endif
 220
 221 $(if $(word 2, $(KBUILD_EXTMOD)), \
 222         $(error building multiple external modules is not supported))
 223
 224 export KBUILD_CHECKSRC KBUILD_EXTMOD
 225
 226 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 227
 228 ifeq ($(abs_srctree),$(abs_objtree))
 229         # building in the source tree
 230         srctree := .
 231         building_out_of_srctree :=
 232 else
 233         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 234                 # building in a subdirectory of the source tree
 235                 srctree := ..
 236         else
 237                 srctree := $(abs_srctree)
 238         endif
 239         building_out_of_srctree := 1
 240 endif
 241
 242 ifneq ($(KBUILD_ABS_SRCTREE),)
 243 srctree := $(abs_srctree)
 244 endif
 245
 246 objtree         := .
 247 VPATH           := $(srctree)
 248
 249 export building_out_of_srctree srctree objtree VPATH
 250
 251 # To make sure we do not include .config for any of the *config targets
 252 # catch them early, and hand them over to scripts/kconfig/Makefile
 253 # It is allowed to specify more targets when calling make, including
 254 # mixing *config targets and build targets.
 255 # For example 'make oldconfig all'.
 256 # Detect when mixed targets is specified, and make a second invocation
 257 # of make so .config is not included in this case either (for *config).
 258
 259 version_h := include/generated/uapi/linux/version.h
 260 old_version_h := include/linux/version.h
 261
 262 clean-targets := %clean mrproper cleandocs
 263 no-dot-config-targets := $(clean-targets) \
 264                          cscope gtags TAGS tags help% %docs check% coccicheck \
 265                          $(version_h) headers headers_% archheaders archscripts \
 266                          %asm-generic kernelversion %src-pkg dt_binding_check \
 267                          outputmakefile
 268 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
 269 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 270
 271 config-build    :=
 272 mixed-build     :=
 273 need-config     := 1
 274 may-sync-config := 1
 275 single-build    :=
 276
 277 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 278         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 279                 need-config :=
 280         endif
 281 endif
 282
 283 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 284         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 285                 may-sync-config :=
 286         endif
 287 endif
 288
 289 ifneq ($(KBUILD_EXTMOD),)
 290         may-sync-config :=
 291 endif
 292
 293 ifeq ($(KBUILD_EXTMOD),)
 294         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 295                 config-build := 1
 296                 ifneq ($(words $(MAKECMDGOALS)),1)
 297                         mixed-build := 1
 298                 endif
 299         endif
 300 endif
 301
 302 # We cannot build single targets and the others at the same time
 303 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 304         single-build := 1
 305         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 306                 mixed-build := 1
 307         endif
 308 endif
 309
 310 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 311 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 312         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 313                 mixed-build := 1
 314         endif
 315 endif
 316
 317 # install and modules_install need also be processed one by one
 318 ifneq ($(filter install,$(MAKECMDGOALS)),)
 319         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 320                 mixed-build := 1
 321         endif
 322 endif
 323
 324 ifdef mixed-build
 325 # ===========================================================================
 326 # We're called with mixed targets (*config and build targets).
 327 # Handle them one by one.
 328
 329 PHONY += $(MAKECMDGOALS) __build_one_by_one
 330
 331 $(MAKECMDGOALS): __build_one_by_one
 332         @:
 333
 334 __build_one_by_one:
 335         $(Q)set -e; \
 336         for i in $(MAKECMDGOALS); do \
 337                 $(MAKE) -f $(srctree)/Makefile $$i; \
 338         done
 339
 340 else # !mixed-build
 341
 342 include scripts/Kbuild.include
 343
 344 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 345 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 346 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 347 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 348
 349 include scripts/subarch.include
 350
 351 # Cross compiling and selecting different set of gcc/bin-utils
 352 # ---------------------------------------------------------------------------
 353 #
 354 # When performing cross compilation for other architectures ARCH shall be set
 355 # to the target architecture. (See arch/* for the possibilities).
 356 # ARCH can be set during invocation of make:
 357 # make ARCH=ia64
 358 # Another way is to have ARCH set in the environment.
 359 # The default ARCH is the host where make is executed.
 360
 361 # CROSS_COMPILE specify the prefix used for all executables used
 362 # during compilation. Only gcc and related bin-utils executables
 363 # are prefixed with $(CROSS_COMPILE).
 364 # CROSS_COMPILE can be set on the command line
 365 # make CROSS_COMPILE=ia64-linux-
 366 # Alternatively CROSS_COMPILE can be set in the environment.
 367 # Default value for CROSS_COMPILE is not to prefix executables
 368 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 369 ARCH            ?= $(SUBARCH)
 370
 371 # Architecture as present in compile.h
 372 UTS_MACHINE     := $(ARCH)
 373 SRCARCH         := $(ARCH)
 374
 375 # Additional ARCH settings for x86
 376 ifeq ($(ARCH),i386)
 377         SRCARCH := x86
 378 endif
 379 ifeq ($(ARCH),x86_64)
 380         SRCARCH := x86
 381 endif
 382
 383 # Additional ARCH settings for sparc
 384 ifeq ($(ARCH),sparc32)
 385        SRCARCH := sparc
 386 endif
 387 ifeq ($(ARCH),sparc64)
 388        SRCARCH := sparc
 389 endif
 390
 391 # Additional ARCH settings for sh
 392 ifeq ($(ARCH),sh64)
 393        SRCARCH := sh
 394 endif
 395
 396 KCONFIG_CONFIG  ?= .config
 397 export KCONFIG_CONFIG
 398
 399 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
 400 export KBUILD_DEFCONFIG := defconfig
 401
 402 # SHELL used by kbuild
 403 CONFIG_SHELL := sh
 404
 405 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 406 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 407 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 408
 409 ifneq ($(LLVM),)
 410 HOSTCC  = clang
 411 HOSTCXX = clang++
 412 else
 413 HOSTCC  = gcc
 414 HOSTCXX = g++
 415 endif
 416
 417 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 418                               -O2 -fomit-frame-pointer -std=gnu89
 419 export KBUILD_USERLDFLAGS :=
 420
 421 KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 422 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 423 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 424 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 425
 426 # Make variables (CC, etc...)
 427 CPP             = $(CC) -E
 428 ifneq ($(LLVM),)
 429 CC              = clang
 430 LD              = ld.lld
 431 AR              = llvm-ar
 432 NM              = llvm-nm
 433 OBJCOPY         = llvm-objcopy
 434 OBJDUMP         = llvm-objdump
 435 READELF         = llvm-readelf
 436 STRIP           = llvm-strip
 437 else
 438 CC              = $(CROSS_COMPILE)gcc
 439 LD              = $(CROSS_COMPILE)ld
 440 AR              = $(CROSS_COMPILE)ar
 441 NM              = $(CROSS_COMPILE)nm
 442 OBJCOPY         = $(CROSS_COMPILE)objcopy
 443 OBJDUMP         = $(CROSS_COMPILE)objdump
 444 READELF         = $(CROSS_COMPILE)readelf
 445 STRIP           = $(CROSS_COMPILE)strip
 446 endif
 447 PAHOLE          = pahole
 448 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 449 LEX             = flex
 450 YACC            = bison
 451 AWK             = awk
 452 INSTALLKERNEL  := installkernel
 453 DEPMOD          = depmod
 454 PERL            = perl
 455 PYTHON          = python
 456 PYTHON3         = python3
 457 CHECK           = sparse
 458 BASH            = bash
 459 KGZIP           = gzip
 460 KBZIP2          = bzip2
 461 KLZOP           = lzop
 462 LZMA            = lzma
 463 LZ4             = lz4c
 464 XZ              = xz
 465 ZSTD            = zstd
 466
 467 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 468                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 469 NOSTDINC_FLAGS :=
 470 CFLAGS_MODULE   =
 471 AFLAGS_MODULE   =
 472 LDFLAGS_MODULE  =
 473 CFLAGS_KERNEL   =
 474 AFLAGS_KERNEL   =
 475 LDFLAGS_vmlinux =
 476
 477 # Use USERINCLUDE when you must reference the UAPI directories only.
 478 USERINCLUDE    := \
 479                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 480                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 481                 -I$(srctree)/include/uapi \
 482                 -I$(objtree)/include/generated/uapi \
 483                 -include $(srctree)/include/linux/kconfig.h
 484
 485 # Use LINUXINCLUDE when you must reference the include/ directory.
 486 # Needed to be compatible with the O= option
 487 LINUXINCLUDE    := \
 488                 -I$(srctree)/arch/$(SRCARCH)/include \
 489                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 490                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 491                 -I$(objtree)/include \
 492                 $(USERINCLUDE)
 493
 494 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 495 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 496                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 497                    -Werror=implicit-function-declaration -Werror=implicit-int \
 498                    -Werror=return-type -Wno-format-security \
 499                    -std=gnu89
 500 KBUILD_CPPFLAGS := -D__KERNEL__
 501 KBUILD_AFLAGS_KERNEL :=
 502 KBUILD_CFLAGS_KERNEL :=
 503 KBUILD_AFLAGS_MODULE  := -DMODULE
 504 KBUILD_CFLAGS_MODULE  := -DMODULE
 505 KBUILD_LDFLAGS_MODULE :=
 506 KBUILD_LDFLAGS :=
 507 CLANG_FLAGS :=
 508
 509 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 510 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 511 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 512 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 513 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 514
 515 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 516 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 517 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 518 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 519 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 520
 521 # Files to ignore in find ... statements
 522
 523 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 524                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 525                           -prune -o
 526 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 527                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 528
 529 # ===========================================================================
 530 # Rules shared between *config targets and build targets
 531
 532 # Basic helpers built in scripts/basic/
 533 PHONY += scripts_basic
 534 scripts_basic:
 535         $(Q)$(MAKE) $(build)=scripts/basic
 536         $(Q)rm -f .tmp_quiet_recordmcount
 537
 538 PHONY += outputmakefile
 539 # Before starting out-of-tree build, make sure the source tree is clean.
 540 # outputmakefile generates a Makefile in the output directory, if using a
 541 # separate output directory. This allows convenient use of make in the
 542 # output directory.
 543 # At the same time when output Makefile generated, generate .gitignore to
 544 # ignore whole output directory
 545 outputmakefile:
 546 ifdef building_out_of_srctree
 547         $(Q)if [ -f $(srctree)/.config -o \
 548                  -d $(srctree)/include/config -o \
 549                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 550                 echo >&2 "***"; \
 551                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 552                 echo >&2 "*** in $(abs_srctree)";\
 553                 echo >&2 "***"; \
 554                 false; \
 555         fi
 556         $(Q)ln -fsn $(srctree) source
 557         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 558         $(Q)test -e .gitignore || \
 559         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 560 endif
 561
 562 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 563 ifneq ($(CROSS_COMPILE),)
 564 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 565 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 566 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 567 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 568 endif
 569 ifneq ($(GCC_TOOLCHAIN),)
 570 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 571 endif
 572 ifneq ($(LLVM_IAS),1)
 573 CLANG_FLAGS     += -no-integrated-as
 574 endif
 575 CLANG_FLAGS     += -Werror=unknown-warning-option
 576 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 577 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 578 export CLANG_FLAGS
 579 endif
 580
 581 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 582 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 583 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 584 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 585 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 586
 587 ifdef config-build
 588 # ===========================================================================
 589 # *config targets only - make sure prerequisites are updated, and descend
 590 # in scripts/kconfig to make the *config target
 591
 592 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 593 # KBUILD_DEFCONFIG may point out an alternative default configuration
 594 # used for 'make defconfig'
 595 include arch/$(SRCARCH)/Makefile
 596 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 597
 598 config: outputmakefile scripts_basic FORCE
 599         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 600
 601 %config: outputmakefile scripts_basic FORCE
 602         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 603
 604 else #!config-build
 605 # ===========================================================================
 606 # Build targets only - this includes vmlinux, arch specific targets, clean
 607 # targets and others. In general all targets except *config targets.
 608
 609 # If building an external module we do not care about the all: rule
 610 # but instead __all depend on modules
 611 PHONY += all
 612 ifeq ($(KBUILD_EXTMOD),)
 613 __all: all
 614 else
 615 __all: modules
 616 endif
 617
 618 # Decide whether to build built-in, modular, or both.
 619 # Normally, just do built-in.
 620
 621 KBUILD_MODULES :=
 622 KBUILD_BUILTIN := 1
 623
 624 # If we have only "make modules", don't compile built-in objects.
 625 ifeq ($(MAKECMDGOALS),modules)
 626   KBUILD_BUILTIN :=
 627 endif
 628
 629 # If we have "make <whatever> modules", compile modules
 630 # in addition to whatever we do anyway.
 631 # Just "make" or "make all" shall build modules as well
 632
 633 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 634   KBUILD_MODULES := 1
 635 endif
 636
 637 ifeq ($(MAKECMDGOALS),)
 638   KBUILD_MODULES := 1
 639 endif
 640
 641 export KBUILD_MODULES KBUILD_BUILTIN
 642
 643 ifdef need-config
 644 include include/config/auto.conf
 645 endif
 646
 647 ifeq ($(KBUILD_EXTMOD),)
 648 # Objects we will link into vmlinux / subdirs we need to visit
 649 core-y          := init/ usr/
 650 drivers-y       := drivers/ sound/
 651 drivers-$(CONFIG_SAMPLES) += samples/
 652 drivers-y       += net/ virt/
 653 libs-y          := lib/
 654 endif # KBUILD_EXTMOD
 655
 656 # The all: target is the default when no target is given on the
 657 # command line.
 658 # This allow a user to issue only 'make' to build a kernel including modules
 659 # Defaults to vmlinux, but the arch makefile usually adds further targets
 660 all: vmlinux
 661
 662 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 663         $(call cc-option,-fno-tree-loop-im) \
 664         $(call cc-disable-warning,maybe-uninitialized,)
 665 export CFLAGS_GCOV
 666
 667 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 668 ifdef CONFIG_FUNCTION_TRACER
 669   CC_FLAGS_FTRACE := -pg
 670 endif
 671
 672 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 673 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 674 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 675 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 676 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 677 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 678 export RETPOLINE_CFLAGS
 679 export RETPOLINE_VDSO_CFLAGS
 680
 681 include arch/$(SRCARCH)/Makefile
 682
 683 ifdef need-config
 684 ifdef may-sync-config
 685 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 686 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 687 # because some architectures define CROSS_COMPILE there.
 688 include include/config/auto.conf.cmd
 689
 690 $(KCONFIG_CONFIG):
 691         @echo >&2 '***'
 692         @echo >&2 '*** Configuration file "$@" not found!'
 693         @echo >&2 '***'
 694         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 695         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 696         @echo >&2 '***'
 697         @/bin/false
 698
 699 # The actual configuration files used during the build are stored in
 700 # include/generated/ and include/config/. Update them if .config is newer than
 701 # include/config/auto.conf (which mirrors .config).
 702 #
 703 # This exploits the 'multi-target pattern rule' trick.
 704 # The syncconfig should be executed only once to make all the targets.
 705 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 706 quiet_cmd_syncconfig = SYNC    $@
 707       cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
 708
 709 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
 710         +$(call cmd,syncconfig)
 711 else # !may-sync-config
 712 # External modules and some install targets need include/generated/autoconf.h
 713 # and include/config/auto.conf but do not care if they are up-to-date.
 714 # Use auto.conf to trigger the test
 715 PHONY += include/config/auto.conf
 716
 717 include/config/auto.conf:
 718         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 719         echo >&2;                                                       \
 720         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 721         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 722         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 723         echo >&2 ;                                                      \
 724         /bin/false)
 725
 726 endif # may-sync-config
 727 endif # need-config
 728
 729 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 730 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 731 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 732 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 733 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 734
 735 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 736 KBUILD_CFLAGS += -O2
 737 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 738 KBUILD_CFLAGS += -O3
 739 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 740 KBUILD_CFLAGS += -Os
 741 endif
 742
 743 # Tell gcc to never replace conditional load with a non-conditional one
 744 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 745 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 746
 747 ifdef CONFIG_READABLE_ASM
 748 # Disable optimizations that make assembler listings hard to read.
 749 # reorder blocks reorders the control in the function
 750 # ipa clone creates specialized cloned functions
 751 # partial inlining inlines only parts of functions
 752 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 753                  $(call cc-option,-fno-ipa-cp-clone,) \
 754                  $(call cc-option,-fno-partial-inlining)
 755 endif
 756
 757 ifneq ($(CONFIG_FRAME_WARN),0)
 758 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 759 endif
 760
 761 stackp-flags-y                                    := -fno-stack-protector
 762 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 763 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 764
 765 KBUILD_CFLAGS += $(stackp-flags-y)
 766
 767 ifdef CONFIG_CC_IS_CLANG
 768 KBUILD_CPPFLAGS += -Qunused-arguments
 769 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 770 KBUILD_CFLAGS += -Wno-gnu
 771 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 772 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 773 # See modpost pattern 2
 774 KBUILD_CFLAGS += -mno-global-merge
 775 else
 776
 777 # These warnings generated too much noise in a regular build.
 778 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 779 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 780
 781 # Warn about unmarked fall-throughs in switch statement.
 782 # Disabled for clang while comment to attribute conversion happens and
 783 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 784 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 785 endif
 786
 787 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 788 ifdef CONFIG_FRAME_POINTER
 789 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 790 else
 791 # Some targets (ARM with Thumb2, for example), can't be built with frame
 792 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 793 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 794 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 795 # -fomit-frame-pointer with FUNCTION_TRACER.
 796 ifndef CONFIG_FUNCTION_TRACER
 797 KBUILD_CFLAGS   += -fomit-frame-pointer
 798 endif
 799 endif
 800
 801 # Initialize all stack variables with a 0xAA pattern.
 802 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 803 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 804 endif
 805
 806 # Initialize all stack variables with a zero value.
 807 ifdef CONFIG_INIT_STACK_ALL_ZERO
 808 # Future support for zero initialization is still being debated, see
 809 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
 810 # renamed or dropped.
 811 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 812 KBUILD_CFLAGS   += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 813 endif
 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 ifdef CONFIG_DEBUG_INFO_DWARF4
 834 DEBUG_CFLAGS    += -gdwarf-4
 835 endif
 836
 837 ifdef CONFIG_DEBUG_INFO_REDUCED
 838 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 839                    $(call cc-option,-fno-var-tracking)
 840 endif
 841
 842 ifdef CONFIG_DEBUG_INFO_COMPRESSED
 843 DEBUG_CFLAGS    += -gz=zlib
 844 KBUILD_AFLAGS   += -gz=zlib
 845 KBUILD_LDFLAGS  += --compress-debug-sections=zlib
 846 endif
 847
 848 endif # CONFIG_DEBUG_INFO
 849
 850 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 851 export DEBUG_CFLAGS
 852
 853 ifdef CONFIG_FUNCTION_TRACER
 854 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 855   # gcc 5 supports generating the mcount tables directly
 856   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 857     CC_FLAGS_FTRACE     += -mrecord-mcount
 858     export CC_USING_RECORD_MCOUNT := 1
 859   endif
 860   ifdef CONFIG_HAVE_NOP_MCOUNT
 861     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 862       CC_FLAGS_FTRACE   += -mnop-mcount
 863       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 864     endif
 865   endif
 866 endif
 867 ifdef CONFIG_HAVE_FENTRY
 868   ifeq ($(call cc-option-yn, -mfentry),y)
 869     CC_FLAGS_FTRACE     += -mfentry
 870     CC_FLAGS_USING      += -DCC_USING_FENTRY
 871   endif
 872 endif
 873 export CC_FLAGS_FTRACE
 874 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 875 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 876 ifdef CONFIG_DYNAMIC_FTRACE
 877         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 878                 BUILD_C_RECORDMCOUNT := y
 879                 export BUILD_C_RECORDMCOUNT
 880         endif
 881 endif
 882 endif
 883
 884 # We trigger additional mismatches with less inlining
 885 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 886 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 887 endif
 888
 889 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 890 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 891 LDFLAGS_vmlinux += --gc-sections
 892 endif
 893
 894 ifdef CONFIG_SHADOW_CALL_STACK
 895 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 896 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 897 export CC_FLAGS_SCS
 898 endif
 899
 900 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
 901 KBUILD_CFLAGS += -falign-functions=32
 902 endif
 903
 904 # arch Makefile may override CC so keep this after arch Makefile is included
 905 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 906
 907 # warn about C99 declaration after statement
 908 KBUILD_CFLAGS += -Wdeclaration-after-statement
 909
 910 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 911 KBUILD_CFLAGS += -Wvla
 912
 913 # disable pointer signed / unsigned warnings in gcc 4.0
 914 KBUILD_CFLAGS += -Wno-pointer-sign
 915
 916 # disable stringop warnings in gcc 8+
 917 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 918
 919 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 920 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 921 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 922 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 923
 924 # Another good warning that we'll want to enable eventually
 925 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 926
 927 # Enabled with W=2, disabled by default as noisy
 928 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 929
 930 # disable invalid "can't wrap" optimizations for signed / pointers
 931 KBUILD_CFLAGS   += -fno-strict-overflow
 932
 933 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 934 KBUILD_CFLAGS  += -fno-stack-check
 935
 936 # conserve stack if available
 937 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 938
 939 # Prohibit date/time macros, which would make the build non-deterministic
 940 KBUILD_CFLAGS   += -Werror=date-time
 941
 942 # enforce correct pointer usage
 943 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 944
 945 # Require designated initializers for all marked structures
 946 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 947
 948 # change __FILE__ to the relative path from the srctree
 949 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 950
 951 # ensure -fcf-protection is disabled when using retpoline as it is
 952 # incompatible with -mindirect-branch=thunk-extern
 953 ifdef CONFIG_RETPOLINE
 954 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 955 endif
 956
 957 # include additional Makefiles when needed
 958 include-y                       := scripts/Makefile.extrawarn
 959 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
 960 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
 961 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
 962 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
 963 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
 964
 965 include $(addprefix $(srctree)/, $(include-y))
 966
 967 # scripts/Makefile.gcc-plugins is intentionally included last.
 968 # Do not add $(call cc-option,...) below this line. When you build the kernel
 969 # from the clean source tree, the GCC plugins do not exist at this point.
 970
 971 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 972 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 973 KBUILD_AFLAGS   += $(KAFLAGS)
 974 KBUILD_CFLAGS   += $(KCFLAGS)
 975
 976 KBUILD_LDFLAGS_MODULE += --build-id=sha1
 977 LDFLAGS_vmlinux += --build-id=sha1
 978
 979 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 980 LDFLAGS_vmlinux += $(call ld-option, -X,)
 981 endif
 982
 983 ifeq ($(CONFIG_RELR),y)
 984 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
 985 endif
 986
 987 # We never want expected sections to be placed heuristically by the
 988 # linker. All sections should be explicitly named in the linker script.
 989 ifdef CONFIG_LD_ORPHAN_WARN
 990 LDFLAGS_vmlinux += --orphan-handling=warn
 991 endif
 992
 993 # Align the bit size of userspace programs with the kernel
 994 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
 995 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
 996
 997 # make the checker run with the right architecture
 998 CHECKFLAGS += --arch=$(ARCH)
 999
1000 # insure the checker run with the right endianness
1001 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1002
1003 # the checker needs the correct machine size
1004 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1005
1006 # Default kernel image to build when no specific target is given.
1007 # KBUILD_IMAGE may be overruled on the command line or
1008 # set in the environment
1009 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1010 # this default value
1011 export KBUILD_IMAGE ?= vmlinux
1012
1013 #
1014 # INSTALL_PATH specifies where to place the updated kernel and system map
1015 # images. Default is /boot, but you can set it to other values
1016 export  INSTALL_PATH ?= /boot
1017
1018 #
1019 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1020 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1021 # an argument if needed. Otherwise it defaults to the kernel install path
1022 #
1023 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1024
1025 #
1026 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1027 # relocations required by build roots.  This is not defined in the
1028 # makefile but the argument can be passed to make if needed.
1029 #
1030
1031 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1032 export MODLIB
1033
1034 #
1035 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1036 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
1037 # the default option --strip-debug will be used.  Otherwise,
1038 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1039
1040 ifdef INSTALL_MOD_STRIP
1041 ifeq ($(INSTALL_MOD_STRIP),1)
1042 mod_strip_cmd = $(STRIP) --strip-debug
1043 else
1044 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1045 endif # INSTALL_MOD_STRIP=1
1046 else
1047 mod_strip_cmd = true
1048 endif # INSTALL_MOD_STRIP
1049 export mod_strip_cmd
1050
1051 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1052 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1053 # or CONFIG_MODULE_COMPRESS_XZ.
1054
1055 mod_compress_cmd = true
1056 ifdef CONFIG_MODULE_COMPRESS
1057   ifdef CONFIG_MODULE_COMPRESS_GZIP
1058     mod_compress_cmd = $(KGZIP) -n -f
1059   endif # CONFIG_MODULE_COMPRESS_GZIP
1060   ifdef CONFIG_MODULE_COMPRESS_XZ
1061     mod_compress_cmd = $(XZ) -f
1062   endif # CONFIG_MODULE_COMPRESS_XZ
1063 endif # CONFIG_MODULE_COMPRESS
1064 export mod_compress_cmd
1065
1066 ifdef CONFIG_MODULE_SIG_ALL
1067 $(eval $(call config_filename,MODULE_SIG_KEY))
1068
1069 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1070 else
1071 mod_sign_cmd = true
1072 endif
1073 export mod_sign_cmd
1074
1075 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1076
1077 has_libelf = $(call try-run,\
1078                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1079
1080 ifdef CONFIG_STACK_VALIDATION
1081   ifeq ($(has_libelf),1)
1082     objtool_target := tools/objtool FORCE
1083   else
1084     SKIP_STACK_VALIDATION := 1
1085     export SKIP_STACK_VALIDATION
1086   endif
1087 endif
1088
1089 ifdef CONFIG_BPF
1090 ifdef CONFIG_DEBUG_INFO_BTF
1091   ifeq ($(has_libelf),1)
1092     resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1093   else
1094     ERROR_RESOLVE_BTFIDS := 1
1095   endif
1096 endif # CONFIG_DEBUG_INFO_BTF
1097 endif # CONFIG_BPF
1098
1099 PHONY += prepare0
1100
1101 export MODORDER := $(extmod-prefix)modules.order
1102 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1103
1104 ifeq ($(KBUILD_EXTMOD),)
1105 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1106
1107 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, \
1108                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1109                      $(libs-y) $(libs-m)))
1110
1111 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1112                      $(patsubst %/,%,$(filter %/, $(core-) \
1113                         $(drivers-) $(libs-))))
1114
1115 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1116                         $(core-y) $(core-m) $(libs-y) $(libs-m) \
1117                         $(drivers-y) $(drivers-m)))
1118
1119 build-dirs      := $(vmlinux-dirs)
1120 clean-dirs      := $(vmlinux-alldirs)
1121
1122 # Externally visible symbols (used by link-vmlinux.sh)
1123 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1124 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1125 ifdef CONFIG_MODULES
1126 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1127 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1128 else
1129 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1130 endif
1131 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1132
1133 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1134 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1135 # used by scripts/Makefile.package
1136 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1137
1138 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1139
1140 # Recurse until adjust_autoksyms.sh is satisfied
1141 PHONY += autoksyms_recursive
1142 ifdef CONFIG_TRIM_UNUSED_KSYMS
1143 # For the kernel to actually contain only the needed exported symbols,
1144 # we have to build modules as well to determine what those symbols are.
1145 # (this can be evaluated only once include/config/auto.conf has been included)
1146 KBUILD_MODULES := 1
1147
1148 autoksyms_recursive: descend modules.order
1149         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1150           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1151 endif
1152
1153 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1154
1155 quiet_cmd_autoksyms_h = GEN     $@
1156       cmd_autoksyms_h = mkdir -p $(dir $@); \
1157                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1158
1159 $(autoksyms_h):
1160         $(call cmd,autoksyms_h)
1161
1162 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1163
1164 # Final link of vmlinux with optional arch pass after final link
1165 cmd_link-vmlinux =                                                 \
1166         $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1167         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1168
1169 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1170         +$(call if_changed,link-vmlinux)
1171
1172 targets := vmlinux
1173
1174 # The actual objects are generated when descending,
1175 # make sure no implicit rule kicks in
1176 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1177
1178 filechk_kernel.release = \
1179         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1180
1181 # Store (new) KERNELRELEASE string in include/config/kernel.release
1182 include/config/kernel.release: FORCE
1183         $(call filechk,kernel.release)
1184
1185 # Additional helpers built in scripts/
1186 # Carefully list dependencies so we do not try to build scripts twice
1187 # in parallel
1188 PHONY += scripts
1189 scripts: scripts_basic scripts_dtc
1190         $(Q)$(MAKE) $(build)=$(@)
1191
1192 # Things we need to do before we recursively start building the kernel
1193 # or the modules are listed in "prepare".
1194 # A multi level approach is used. prepareN is processed before prepareN-1.
1195 # archprepare is used in arch Makefiles and when processed asm symlink,
1196 # version.h and scripts_basic is processed / created.
1197
1198 PHONY += prepare archprepare
1199
1200 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1201         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1202         include/generated/autoconf.h
1203
1204 prepare0: archprepare
1205         $(Q)$(MAKE) $(build)=scripts/mod
1206         $(Q)$(MAKE) $(build)=.
1207
1208 # All the preparing..
1209 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1210
1211 # Support for using generic headers in asm-generic
1212 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1213
1214 PHONY += asm-generic uapi-asm-generic
1215 asm-generic: uapi-asm-generic
1216         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1217         generic=include/asm-generic
1218 uapi-asm-generic:
1219         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1220         generic=include/uapi/asm-generic
1221
1222 PHONY += prepare-objtool prepare-resolve_btfids
1223 prepare-objtool: $(objtool_target)
1224 ifeq ($(SKIP_STACK_VALIDATION),1)
1225 ifdef CONFIG_UNWINDER_ORC
1226         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1227         @false
1228 else
1229         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1230 endif
1231 endif
1232
1233 prepare-resolve_btfids: $(resolve_btfids_target)
1234 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1235         @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1236         @false
1237 endif
1238 # Generate some files
1239 # ---------------------------------------------------------------------------
1240
1241 # KERNELRELEASE can change from a few different places, meaning version.h
1242 # needs to be updated, so this check is forced on all builds
1243
1244 uts_len := 64
1245 define filechk_utsrelease.h
1246         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1247           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1248           exit 1;                                                         \
1249         fi;                                                               \
1250         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1251 endef
1252
1253 define filechk_version.h
1254         echo \#define LINUX_VERSION_CODE $(shell                         \
1255         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1256         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1257 endef
1258
1259 $(version_h): FORCE
1260         $(call filechk,version.h)
1261         $(Q)rm -f $(old_version_h)
1262
1263 include/generated/utsrelease.h: include/config/kernel.release FORCE
1264         $(call filechk,utsrelease.h)
1265
1266 PHONY += headerdep
1267 headerdep:
1268         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1269         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1270
1271 # ---------------------------------------------------------------------------
1272 # Kernel headers
1273
1274 #Default location for installed headers
1275 export INSTALL_HDR_PATH = $(objtree)/usr
1276
1277 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1278       cmd_headers_install = \
1279         mkdir -p $(INSTALL_HDR_PATH); \
1280         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1281         usr/include $(INSTALL_HDR_PATH)
1282
1283 PHONY += headers_install
1284 headers_install: headers
1285         $(call cmd,headers_install)
1286
1287 PHONY += archheaders archscripts
1288
1289 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1290
1291 PHONY += headers
1292 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1293         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1294           $(error Headers not exportable for the $(SRCARCH) architecture))
1295         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1296         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1297
1298 # Deprecated. It is no-op now.
1299 PHONY += headers_check
1300 headers_check:
1301         @:
1302
1303 ifdef CONFIG_HEADERS_INSTALL
1304 prepare: headers
1305 endif
1306
1307 PHONY += scripts_unifdef
1308 scripts_unifdef: scripts_basic
1309         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1310
1311 # ---------------------------------------------------------------------------
1312 # Kernel selftest
1313
1314 PHONY += kselftest
1315 kselftest:
1316         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1317
1318 kselftest-%: FORCE
1319         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1320
1321 PHONY += kselftest-merge
1322 kselftest-merge:
1323         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1324         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1325                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1326         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1327
1328 # ---------------------------------------------------------------------------
1329 # Devicetree files
1330
1331 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1332 dtstree := arch/$(SRCARCH)/boot/dts
1333 endif
1334
1335 ifneq ($(dtstree),)
1336
1337 %.dtb: include/config/kernel.release scripts_dtc
1338         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1339
1340 PHONY += dtbs dtbs_install dtbs_check
1341 dtbs: include/config/kernel.release scripts_dtc
1342         $(Q)$(MAKE) $(build)=$(dtstree)
1343
1344 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1345 export CHECK_DTBS=y
1346 dtbs: dt_binding_check
1347 endif
1348
1349 dtbs_check: dtbs
1350
1351 dtbs_install:
1352         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1353
1354 ifdef CONFIG_OF_EARLY_FLATTREE
1355 all: dtbs
1356 endif
1357
1358 endif
1359
1360 PHONY += scripts_dtc
1361 scripts_dtc: scripts_basic
1362         $(Q)$(MAKE) $(build)=scripts/dtc
1363
1364 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1365 export CHECK_DT_BINDING=y
1366 endif
1367
1368 PHONY += dt_binding_check
1369 dt_binding_check: scripts_dtc
1370         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1371
1372 # ---------------------------------------------------------------------------
1373 # Modules
1374
1375 ifdef CONFIG_MODULES
1376
1377 # By default, build modules as well
1378
1379 all: modules
1380
1381 # When we're building modules with modversions, we need to consider
1382 # the built-in objects during the descend as well, in order to
1383 # make sure the checksums are up to date before we record them.
1384 ifdef CONFIG_MODVERSIONS
1385   KBUILD_BUILTIN := 1
1386 endif
1387
1388 # Build modules
1389 #
1390 # A module can be listed more than once in obj-m resulting in
1391 # duplicate lines in modules.order files.  Those are removed
1392 # using awk while concatenating to the final file.
1393
1394 PHONY += modules
1395 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1396         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1397
1398 PHONY += modules_check
1399 modules_check: modules.order
1400         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1401
1402 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1403
1404 modules.order: $(subdir-modorder) FORCE
1405         $(call if_changed,modules_order)
1406
1407 targets += modules.order
1408
1409 # Target to prepare building external modules
1410 PHONY += modules_prepare
1411 modules_prepare: prepare
1412         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1413
1414 # Target to install modules
1415 PHONY += modules_install
1416 modules_install: _modinst_ _modinst_post
1417
1418 PHONY += _modinst_
1419 _modinst_:
1420         @rm -rf $(MODLIB)/kernel
1421         @rm -f $(MODLIB)/source
1422         @mkdir -p $(MODLIB)/kernel
1423         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1424         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1425                 rm -f $(MODLIB)/build ; \
1426                 ln -s $(CURDIR) $(MODLIB)/build ; \
1427         fi
1428         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1429         @cp -f modules.builtin $(MODLIB)/
1430         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1431         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1432
1433 # This depmod is only for convenience to give the initial
1434 # boot a modules.dep even before / is mounted read-write.  However the
1435 # boot script depmod is the master version.
1436 PHONY += _modinst_post
1437 _modinst_post: _modinst_
1438         $(call cmd,depmod)
1439
1440 ifeq ($(CONFIG_MODULE_SIG), y)
1441 PHONY += modules_sign
1442 modules_sign:
1443         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1444 endif
1445
1446 else # CONFIG_MODULES
1447
1448 # Modules not configured
1449 # ---------------------------------------------------------------------------
1450
1451 PHONY += modules modules_install
1452 modules modules_install:
1453         @echo >&2
1454         @echo >&2 "The present kernel configuration has modules disabled."
1455         @echo >&2 "Type 'make config' and enable loadable module support."
1456         @echo >&2 "Then build a kernel with module support enabled."
1457         @echo >&2
1458         @exit 1
1459
1460 endif # CONFIG_MODULES
1461
1462 ###
1463 # Cleaning is done on three levels.
1464 # make clean     Delete most generated files
1465 #                Leave enough to build external modules
1466 # make mrproper  Delete the current configuration, and all generated files
1467 # make distclean Remove editor backup files, patch leftover files and the like
1468
1469 # Directories & files removed with 'make clean'
1470 CLEAN_FILES += include/ksym vmlinux.symvers \
1471                modules.builtin modules.builtin.modinfo modules.nsdeps \
1472                compile_commands.json
1473
1474 # Directories & files removed with 'make mrproper'
1475 MRPROPER_FILES += include/config include/generated          \
1476                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1477                   debian snap tar-install \
1478                   .config .config.old .version \
1479                   Module.symvers \
1480                   signing_key.pem signing_key.priv signing_key.x509     \
1481                   x509.genkey extra_certificates signing_key.x509.keyid \
1482                   signing_key.x509.signer vmlinux-gdb.py \
1483                   *.spec
1484
1485 # Directories & files removed with 'make distclean'
1486 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1487
1488 # clean - Delete most, but leave enough to build external modules
1489 #
1490 clean: rm-files := $(CLEAN_FILES)
1491
1492 PHONY += archclean vmlinuxclean
1493
1494 vmlinuxclean:
1495         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1496         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1497
1498 clean: archclean vmlinuxclean
1499
1500 # mrproper - Delete all generated files, including .config
1501 #
1502 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1503 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1504
1505 PHONY += $(mrproper-dirs) mrproper
1506 $(mrproper-dirs):
1507         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1508
1509 mrproper: clean $(mrproper-dirs)
1510         $(call cmd,rmfiles)
1511
1512 # distclean
1513 #
1514 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1515
1516 PHONY += distclean
1517
1518 distclean: mrproper
1519         $(call cmd,rmfiles)
1520         @find $(srctree) $(RCS_FIND_IGNORE) \
1521                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1522                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1523                 -o -name 'core' \) \
1524                 -type f -print | xargs rm -f
1525
1526
1527 # Packaging of the kernel to various formats
1528 # ---------------------------------------------------------------------------
1529
1530 %src-pkg: FORCE
1531         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1532 %pkg: include/config/kernel.release FORCE
1533         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1534
1535 # Brief documentation of the typical targets used
1536 # ---------------------------------------------------------------------------
1537
1538 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1539 boards := $(sort $(notdir $(boards)))
1540 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1541 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1542
1543 PHONY += help
1544 help:
1545         @echo  'Cleaning targets:'
1546         @echo  '  clean           - Remove most generated files but keep the config and'
1547         @echo  '                    enough build support to build external modules'
1548         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1549         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1550         @echo  ''
1551         @echo  'Configuration targets:'
1552         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1553         @echo  ''
1554         @echo  'Other generic targets:'
1555         @echo  '  all             - Build all targets marked with [*]'
1556         @echo  '* vmlinux         - Build the bare kernel'
1557         @echo  '* modules         - Build all modules'
1558         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1559         @echo  '  dir/            - Build all files in dir and below'
1560         @echo  '  dir/file.[ois]  - Build specified target only'
1561         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1562         @echo  '                    (requires compiler support for LLVM assembly generation)'
1563         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1564         @echo  '                    (requires a recent binutils and recent build (System.map))'
1565         @echo  '  dir/file.ko     - Build module including final link'
1566         @echo  '  modules_prepare - Set up for building external modules'
1567         @echo  '  tags/TAGS       - Generate tags file for editors'
1568         @echo  '  cscope          - Generate cscope index'
1569         @echo  '  gtags           - Generate GNU GLOBAL index'
1570         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1571         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1572         @echo  '  image_name      - Output the image name (use with make -s)'
1573         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1574          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1575          echo  ''
1576         @echo  'Static analysers:'
1577         @echo  '  checkstack      - Generate a list of stack hogs'
1578         @echo  '  versioncheck    - Sanity check on version.h usage'
1579         @echo  '  includecheck    - Check for duplicate included header files'
1580         @echo  '  export_report   - List the usages of all exported symbols'
1581         @echo  '  headerdep       - Detect inclusion cycles in headers'
1582         @echo  '  coccicheck      - Check with Coccinelle'
1583         @echo  '  clang-analyzer  - Check with clang static analyzer'
1584         @echo  '  clang-tidy      - Check with clang-tidy'
1585         @echo  ''
1586         @echo  'Tools:'
1587         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1588         @echo  ''
1589         @echo  'Kernel selftest:'
1590         @echo  '  kselftest         - Build and run kernel selftest'
1591         @echo  '                      Build, install, and boot kernel before'
1592         @echo  '                      running kselftest on it'
1593         @echo  '                      Run as root for full coverage'
1594         @echo  '  kselftest-all     - Build kernel selftest'
1595         @echo  '  kselftest-install - Build and install kernel selftest'
1596         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1597         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1598         @echo  '                      kselftest to existing .config.'
1599         @echo  ''
1600         @$(if $(dtstree), \
1601                 echo 'Devicetree:'; \
1602                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1603                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1604                 echo '  dt_binding_check - Validate device tree binding documents'; \
1605                 echo '  dtbs_check       - Validate device tree source files';\
1606                 echo '')
1607
1608         @echo 'Userspace tools targets:'
1609         @echo '  use "make tools/help"'
1610         @echo '  or  "cd tools; make help"'
1611         @echo  ''
1612         @echo  'Kernel packaging:'
1613         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1614         @echo  ''
1615         @echo  'Documentation targets:'
1616         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1617         @echo  ''
1618         @echo  'Architecture specific targets ($(SRCARCH)):'
1619         @$(if $(archhelp),$(archhelp),\
1620                 echo '  No architecture specific help defined for $(SRCARCH)')
1621         @echo  ''
1622         @$(if $(boards), \
1623                 $(foreach b, $(boards), \
1624                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1625                 echo '')
1626         @$(if $(board-dirs), \
1627                 $(foreach b, $(board-dirs), \
1628                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1629                 printf "  %-16s - Show all of the above\\n" help-boards; \
1630                 echo '')
1631
1632         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1633         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1634         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1635         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1636         @echo  '                       (sparse by default)'
1637         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1638         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1639         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1640         @echo  '                1: warnings which may be relevant and do not occur too often'
1641         @echo  '                2: warnings which occur quite often but may still be relevant'
1642         @echo  '                3: more obscure warnings, can most likely be ignored'
1643         @echo  '                Multiple levels can be combined with W=12 or W=123'
1644         @echo  ''
1645         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1646         @echo  'For further info see the ./README file'
1647
1648
1649 help-board-dirs := $(addprefix help-,$(board-dirs))
1650
1651 help-boards: $(help-board-dirs)
1652
1653 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1654
1655 $(help-board-dirs): help-%:
1656         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1657         @$(if $(boards-per-dir), \
1658                 $(foreach b, $(boards-per-dir), \
1659                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1660                 echo '')
1661
1662
1663 # Documentation targets
1664 # ---------------------------------------------------------------------------
1665 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1666                linkcheckdocs dochelp refcheckdocs
1667 PHONY += $(DOC_TARGETS)
1668 $(DOC_TARGETS):
1669         $(Q)$(MAKE) $(build)=Documentation $@
1670
1671 # Misc
1672 # ---------------------------------------------------------------------------
1673
1674 PHONY += scripts_gdb
1675 scripts_gdb: prepare0
1676         $(Q)$(MAKE) $(build)=scripts/gdb
1677         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1678
1679 ifdef CONFIG_GDB_SCRIPTS
1680 all: scripts_gdb
1681 endif
1682
1683 else # KBUILD_EXTMOD
1684
1685 ###
1686 # External module support.
1687 # When building external modules the kernel used as basis is considered
1688 # read-only, and no consistency checks are made and the make
1689 # system is not used on the basis kernel. If updates are required
1690 # in the basis kernel ordinary make commands (without M=...) must
1691 # be used.
1692 #
1693 # The following are the only valid targets when building external
1694 # modules.
1695 # make M=dir clean     Delete all automatically generated files
1696 # make M=dir modules   Make all modules in specified dir
1697 # make M=dir           Same as 'make M=dir modules'
1698 # make M=dir modules_install
1699 #                      Install the modules built in the module directory
1700 #                      Assumes install directory is already created
1701
1702 # We are always building only modules.
1703 KBUILD_BUILTIN :=
1704 KBUILD_MODULES := 1
1705
1706 build-dirs := $(KBUILD_EXTMOD)
1707 PHONY += modules
1708 modules: $(MODORDER)
1709         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1710
1711 $(MODORDER): descend
1712         @:
1713
1714 PHONY += modules_install
1715 modules_install: _emodinst_ _emodinst_post
1716
1717 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1718 PHONY += _emodinst_
1719 _emodinst_:
1720         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1721         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1722
1723 PHONY += _emodinst_post
1724 _emodinst_post: _emodinst_
1725         $(call cmd,depmod)
1726
1727 compile_commands.json: $(extmod-prefix)compile_commands.json
1728 PHONY += compile_commands.json
1729
1730 clean-dirs := $(KBUILD_EXTMOD)
1731 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1732         $(KBUILD_EXTMOD)/compile_commands.json
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 += prepare modules_prepare
1746
1747 endif # KBUILD_EXTMOD
1748
1749 # Single targets
1750 # ---------------------------------------------------------------------------
1751 # To build individual files in subdirectories, you can do like this:
1752 #
1753 #   make foo/bar/baz.s
1754 #
1755 # The supported suffixes for single-target are listed in 'single-targets'
1756 #
1757 # To build only under specific subdirectories, you can do like this:
1758 #
1759 #   make foo/bar/baz/
1760
1761 ifdef single-build
1762
1763 # .ko is special because modpost is needed
1764 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1765 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1766
1767 $(single-ko): single_modpost
1768         @:
1769 $(single-no-ko): descend
1770         @:
1771
1772 ifeq ($(KBUILD_EXTMOD),)
1773 # For the single build of in-tree modules, use a temporary file to avoid
1774 # the situation of modules_install installing an invalid modules.order.
1775 MODORDER := .modules.tmp
1776 endif
1777
1778 PHONY += single_modpost
1779 single_modpost: $(single-no-ko) modules_prepare
1780         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1781         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1782
1783 KBUILD_MODULES := 1
1784
1785 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1786
1787 # trim unrelated directories
1788 build-dirs := $(foreach d, $(build-dirs), \
1789                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1790
1791 endif
1792
1793 ifndef CONFIG_MODULES
1794 KBUILD_MODULES :=
1795 endif
1796
1797 # Handle descending into subdirectories listed in $(build-dirs)
1798 # Preset locale variables to speed up the build process. Limit locale
1799 # tweaks to this spot to avoid wrong language settings when running
1800 # make menuconfig etc.
1801 # Error messages still appears in the original language
1802 PHONY += descend $(build-dirs)
1803 descend: $(build-dirs)
1804 $(build-dirs): prepare
1805         $(Q)$(MAKE) $(build)=$@ \
1806         single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1807         need-builtin=1 need-modorder=1
1808
1809 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1810 PHONY += $(clean-dirs) clean
1811 $(clean-dirs):
1812         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1813
1814 clean: $(clean-dirs)
1815         $(call cmd,rmfiles)
1816         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1817                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1818                 -o -name '*.ko.*' \
1819                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1820                 -o -name '*.dwo' -o -name '*.lst' \
1821                 -o -name '*.su' -o -name '*.mod' \
1822                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1823                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1824                 -o -name '*.asn1.[ch]' \
1825                 -o -name '*.symtypes' -o -name 'modules.order' \
1826                 -o -name '.tmp_*.o.*' \
1827                 -o -name '*.c.[012]*.*' \
1828                 -o -name '*.ll' \
1829                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1830
1831 # Generate tags for editors
1832 # ---------------------------------------------------------------------------
1833 quiet_cmd_tags = GEN     $@
1834       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1835
1836 tags TAGS cscope gtags: FORCE
1837         $(call cmd,tags)
1838
1839 # Script to generate missing namespace dependencies
1840 # ---------------------------------------------------------------------------
1841
1842 PHONY += nsdeps
1843 nsdeps: export KBUILD_NSDEPS=1
1844 nsdeps: modules
1845         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1846
1847 # Clang Tooling
1848 # ---------------------------------------------------------------------------
1849
1850 quiet_cmd_gen_compile_commands = GEN     $@
1851       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1852
1853 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1854         $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1855         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1856         $(call if_changed,gen_compile_commands)
1857
1858 targets += $(extmod-prefix)compile_commands.json
1859
1860 PHONY += clang-tidy clang-analyzer
1861
1862 ifdef CONFIG_CC_IS_CLANG
1863 quiet_cmd_clang_tools = CHECK   $<
1864       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1865
1866 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1867         $(call cmd,clang_tools)
1868 else
1869 clang-tidy clang-analyzer:
1870         @echo "$@ requires CC=clang" >&2
1871         @false
1872 endif
1873
1874 # Scripts to check various things for consistency
1875 # ---------------------------------------------------------------------------
1876
1877 PHONY += includecheck versioncheck coccicheck export_report
1878
1879 includecheck:
1880         find $(srctree)/* $(RCS_FIND_IGNORE) \
1881                 -name '*.[hcS]' -type f -print | sort \
1882                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1883
1884 versioncheck:
1885         find $(srctree)/* $(RCS_FIND_IGNORE) \
1886                 -name '*.[hcS]' -type f -print | sort \
1887                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1888
1889 coccicheck:
1890         $(Q)$(BASH) $(srctree)/scripts/$@
1891
1892 export_report:
1893         $(PERL) $(srctree)/scripts/export_report.pl
1894
1895 PHONY += checkstack kernelrelease kernelversion image_name
1896
1897 # UML needs a little special treatment here.  It wants to use the host
1898 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1899 # else wants $(ARCH), including people doing cross-builds, which means
1900 # that $(SUBARCH) doesn't work here.
1901 ifeq ($(ARCH), um)
1902 CHECKSTACK_ARCH := $(SUBARCH)
1903 else
1904 CHECKSTACK_ARCH := $(ARCH)
1905 endif
1906 checkstack:
1907         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1908         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1909
1910 kernelrelease:
1911         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1912
1913 kernelversion:
1914         @echo $(KERNELVERSION)
1915
1916 image_name:
1917         @echo $(KBUILD_IMAGE)
1918
1919 # Clear a bunch of variables before executing the submake
1920
1921 ifeq ($(quiet),silent_)
1922 tools_silent=s
1923 endif
1924
1925 tools/: FORCE
1926         $(Q)mkdir -p $(objtree)/tools
1927         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1928
1929 tools/%: FORCE
1930         $(Q)mkdir -p $(objtree)/tools
1931         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1932
1933 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1934       cmd_rmfiles = rm -rf $(rm-files)
1935
1936 # Run depmod only if we have System.map and depmod is executable
1937 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1938       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1939                    $(KERNELRELEASE)
1940
1941 # read saved command lines for existing targets
1942 existing-targets := $(wildcard $(sort $(targets)))
1943
1944 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1945
1946 endif # config-build
1947 endif # mixed-build
1948 endif # need-sub-make
1949
1950 PHONY += FORCE
1951 FORCE:
1952
1953 # Declare the contents of the PHONY variable as phony.  We keep that
1954 # information in a variable so we can use it in if_changed and friends.
1955 .PHONY: $(PHONY)