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