Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 4
   4 SUBLEVEL = 51
   5 EXTRAVERSION =
   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 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub_make_done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # Kbuild will save output files in the current working directory.
 100 # This does not need to match to the root of the kernel source tree.
 101 #
 102 # For example, you can do this:
 103 #
 104 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105 #
 106 # If you want to save output files in a different location, there are
 107 # two syntaxes to specify it.
 108 #
 109 # 1) O=
 110 # Use "make O=dir/to/store/output/files/"
 111 #
 112 # 2) Set KBUILD_OUTPUT
 113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115 #
 116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117 # variable.
 118
 119 # Do we want to change the working directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 ifneq ($(KBUILD_OUTPUT),)
 125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126 # expand a shell special character '~'. We use a somewhat tedious way here.
 127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128 $(if $(abs_objtree),, \
 129      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131 # $(realpath ...) resolves symlinks
 132 abs_objtree := $(realpath $(abs_objtree))
 133 else
 134 abs_objtree := $(CURDIR)
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137 ifeq ($(abs_objtree),$(CURDIR))
 138 # Suppress "Entering directory ..." unless we are changing the work directory.
 139 MAKEFLAGS += --no-print-directory
 140 else
 141 need-sub-make := 1
 142 endif
 143
 144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147 $(error source directory cannot contain spaces or colons)
 148 endif
 149
 150 ifneq ($(abs_srctree),$(abs_objtree))
 151 # Look for make include files relative to root of kernel src
 152 #
 153 # This does not become effective immediately because MAKEFLAGS is re-parsed
 154 # once after the Makefile is read. We need to invoke sub-make.
 155 MAKEFLAGS += --include-dir=$(abs_srctree)
 156 need-sub-make := 1
 157 endif
 158
 159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162 need-sub-make := 1
 163 # Cancel implicit rules for this Makefile.
 164 $(lastword $(MAKEFILE_LIST)): ;
 165 endif
 166
 167 export abs_srctree abs_objtree
 168 export sub_make_done := 1
 169
 170 ifeq ($(need-sub-make),1)
 171
 172 PHONY += $(MAKECMDGOALS) sub-make
 173
 174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175         @:
 176
 177 # Invoke a second make in the output directory, passing relevant variables
 178 sub-make:
 179         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181 endif # need-sub-make
 182 endif # sub_make_done
 183
 184 # We process the rest of the Makefile if this is the final invocation of make
 185 ifeq ($(need-sub-make),)
 186
 187 # Do not print "Entering directory ...",
 188 # but we want to display it when entering to the output directory
 189 # so that IDEs/editors are able to understand relative filenames.
 190 MAKEFLAGS += --no-print-directory
 191
 192 # Call a source code checker (by default, "sparse") as part of the
 193 # C compilation.
 194 #
 195 # Use 'make C=1' to enable checking of only re-compiled files.
 196 # Use 'make C=2' to enable checking of *all* source files, regardless
 197 # of whether they are re-compiled or not.
 198 #
 199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 200 # including where to get the "sparse" utility.
 201
 202 ifeq ("$(origin C)", "command line")
 203   KBUILD_CHECKSRC = $(C)
 204 endif
 205 ifndef KBUILD_CHECKSRC
 206   KBUILD_CHECKSRC = 0
 207 endif
 208
 209 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 210 # directory of external module to build. Setting M= takes precedence.
 211 ifeq ("$(origin M)", "command line")
 212   KBUILD_EXTMOD := $(M)
 213 endif
 214
 215 export KBUILD_CHECKSRC KBUILD_EXTMOD
 216
 217 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 218
 219 ifeq ($(abs_srctree),$(abs_objtree))
 220         # building in the source tree
 221         srctree := .
 222         building_out_of_srctree :=
 223 else
 224         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 225                 # building in a subdirectory of the source tree
 226                 srctree := ..
 227         else
 228                 srctree := $(abs_srctree)
 229         endif
 230         building_out_of_srctree := 1
 231 endif
 232
 233 ifneq ($(KBUILD_ABS_SRCTREE),)
 234 srctree := $(abs_srctree)
 235 endif
 236
 237 objtree         := .
 238 VPATH           := $(srctree)
 239
 240 export building_out_of_srctree srctree objtree VPATH
 241
 242 # To make sure we do not include .config for any of the *config targets
 243 # catch them early, and hand them over to scripts/kconfig/Makefile
 244 # It is allowed to specify more targets when calling make, including
 245 # mixing *config targets and build targets.
 246 # For example 'make oldconfig all'.
 247 # Detect when mixed targets is specified, and make a second invocation
 248 # of make so .config is not included in this case either (for *config).
 249
 250 version_h := include/generated/uapi/linux/version.h
 251 old_version_h := include/linux/version.h
 252
 253 clean-targets := %clean mrproper cleandocs
 254 no-dot-config-targets := $(clean-targets) \
 255                          cscope gtags TAGS tags help% %docs check% coccicheck \
 256                          $(version_h) headers headers_% archheaders archscripts \
 257                          %asm-generic kernelversion %src-pkg
 258 no-sync-config-targets := $(no-dot-config-targets) install %install \
 259                            kernelrelease
 260 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 261
 262 config-build    :=
 263 mixed-build     :=
 264 need-config     := 1
 265 may-sync-config := 1
 266 single-build    :=
 267
 268 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 269         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 270                 need-config :=
 271         endif
 272 endif
 273
 274 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 275         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 276                 may-sync-config :=
 277         endif
 278 endif
 279
 280 ifneq ($(KBUILD_EXTMOD),)
 281         may-sync-config :=
 282 endif
 283
 284 ifeq ($(KBUILD_EXTMOD),)
 285         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 286                 config-build := 1
 287                 ifneq ($(words $(MAKECMDGOALS)),1)
 288                         mixed-build := 1
 289                 endif
 290         endif
 291 endif
 292
 293 # We cannot build single targets and the others at the same time
 294 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 295         single-build := 1
 296         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 297                 mixed-build := 1
 298         endif
 299 endif
 300
 301 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 302 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 303         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 304                 mixed-build := 1
 305         endif
 306 endif
 307
 308 # install and modules_install need also be processed one by one
 309 ifneq ($(filter install,$(MAKECMDGOALS)),)
 310         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 311                 mixed-build := 1
 312         endif
 313 endif
 314
 315 ifdef mixed-build
 316 # ===========================================================================
 317 # We're called with mixed targets (*config and build targets).
 318 # Handle them one by one.
 319
 320 PHONY += $(MAKECMDGOALS) __build_one_by_one
 321
 322 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 323         @:
 324
 325 __build_one_by_one:
 326         $(Q)set -e; \
 327         for i in $(MAKECMDGOALS); do \
 328                 $(MAKE) -f $(srctree)/Makefile $$i; \
 329         done
 330
 331 else # !mixed-build
 332
 333 include scripts/Kbuild.include
 334
 335 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 336 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 337 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 338 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 339
 340 include scripts/subarch.include
 341
 342 # Cross compiling and selecting different set of gcc/bin-utils
 343 # ---------------------------------------------------------------------------
 344 #
 345 # When performing cross compilation for other architectures ARCH shall be set
 346 # to the target architecture. (See arch/* for the possibilities).
 347 # ARCH can be set during invocation of make:
 348 # make ARCH=ia64
 349 # Another way is to have ARCH set in the environment.
 350 # The default ARCH is the host where make is executed.
 351
 352 # CROSS_COMPILE specify the prefix used for all executables used
 353 # during compilation. Only gcc and related bin-utils executables
 354 # are prefixed with $(CROSS_COMPILE).
 355 # CROSS_COMPILE can be set on the command line
 356 # make CROSS_COMPILE=ia64-linux-
 357 # Alternatively CROSS_COMPILE can be set in the environment.
 358 # Default value for CROSS_COMPILE is not to prefix executables
 359 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 360 ARCH            ?= $(SUBARCH)
 361
 362 # Architecture as present in compile.h
 363 UTS_MACHINE     := $(ARCH)
 364 SRCARCH         := $(ARCH)
 365
 366 # Additional ARCH settings for x86
 367 ifeq ($(ARCH),i386)
 368         SRCARCH := x86
 369 endif
 370 ifeq ($(ARCH),x86_64)
 371         SRCARCH := x86
 372 endif
 373
 374 # Additional ARCH settings for sparc
 375 ifeq ($(ARCH),sparc32)
 376        SRCARCH := sparc
 377 endif
 378 ifeq ($(ARCH),sparc64)
 379        SRCARCH := sparc
 380 endif
 381
 382 # Additional ARCH settings for sh
 383 ifeq ($(ARCH),sh64)
 384        SRCARCH := sh
 385 endif
 386
 387 KCONFIG_CONFIG  ?= .config
 388 export KCONFIG_CONFIG
 389
 390 # SHELL used by kbuild
 391 CONFIG_SHELL := sh
 392
 393 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 394 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 395 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 396
 397 HOSTCC       = gcc
 398 HOSTCXX      = g++
 399 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 400                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 401                 $(HOSTCFLAGS)
 402 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 403 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 404 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 405
 406 # Make variables (CC, etc...)
 407 AS              = $(CROSS_COMPILE)as
 408 LD              = $(CROSS_COMPILE)ld
 409 CC              = $(CROSS_COMPILE)gcc
 410 CPP             = $(CC) -E
 411 AR              = $(CROSS_COMPILE)ar
 412 NM              = $(CROSS_COMPILE)nm
 413 STRIP           = $(CROSS_COMPILE)strip
 414 OBJCOPY         = $(CROSS_COMPILE)objcopy
 415 OBJDUMP         = $(CROSS_COMPILE)objdump
 416 OBJSIZE         = $(CROSS_COMPILE)size
 417 PAHOLE          = pahole
 418 LEX             = flex
 419 YACC            = bison
 420 AWK             = awk
 421 INSTALLKERNEL  := installkernel
 422 DEPMOD          = /sbin/depmod
 423 PERL            = perl
 424 PYTHON          = python
 425 PYTHON2         = python2
 426 PYTHON3         = python3
 427 CHECK           = sparse
 428 BASH            = bash
 429
 430 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 431                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 432 NOSTDINC_FLAGS :=
 433 CFLAGS_MODULE   =
 434 AFLAGS_MODULE   =
 435 LDFLAGS_MODULE  =
 436 CFLAGS_KERNEL   =
 437 AFLAGS_KERNEL   =
 438 LDFLAGS_vmlinux =
 439
 440 # Use USERINCLUDE when you must reference the UAPI directories only.
 441 USERINCLUDE    := \
 442                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 443                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 444                 -I$(srctree)/include/uapi \
 445                 -I$(objtree)/include/generated/uapi \
 446                 -include $(srctree)/include/linux/kconfig.h
 447
 448 # Use LINUXINCLUDE when you must reference the include/ directory.
 449 # Needed to be compatible with the O= option
 450 LINUXINCLUDE    := \
 451                 -I$(srctree)/arch/$(SRCARCH)/include \
 452                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 453                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 454                 -I$(objtree)/include \
 455                 $(USERINCLUDE)
 456
 457 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 458 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 459                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 460                    -Werror=implicit-function-declaration -Werror=implicit-int \
 461                    -Wno-format-security \
 462                    -std=gnu89
 463 KBUILD_CPPFLAGS := -D__KERNEL__
 464 KBUILD_AFLAGS_KERNEL :=
 465 KBUILD_CFLAGS_KERNEL :=
 466 KBUILD_AFLAGS_MODULE  := -DMODULE
 467 KBUILD_CFLAGS_MODULE  := -DMODULE
 468 KBUILD_LDFLAGS_MODULE :=
 469 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 470 KBUILD_LDFLAGS :=
 471 GCC_PLUGINS_CFLAGS :=
 472 CLANG_FLAGS :=
 473
 474 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 475 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 476 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 477 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 478
 479 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 480 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 481 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 482 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 483 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 484 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 485
 486 # Files to ignore in find ... statements
 487
 488 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 489                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 490                           -prune -o
 491 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 492                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 493
 494 # ===========================================================================
 495 # Rules shared between *config targets and build targets
 496
 497 # Basic helpers built in scripts/basic/
 498 PHONY += scripts_basic
 499 scripts_basic:
 500         $(Q)$(MAKE) $(build)=scripts/basic
 501         $(Q)rm -f .tmp_quiet_recordmcount
 502
 503 PHONY += outputmakefile
 504 # Before starting out-of-tree build, make sure the source tree is clean.
 505 # outputmakefile generates a Makefile in the output directory, if using a
 506 # separate output directory. This allows convenient use of make in the
 507 # output directory.
 508 # At the same time when output Makefile generated, generate .gitignore to
 509 # ignore whole output directory
 510 outputmakefile:
 511 ifdef building_out_of_srctree
 512         $(Q)if [ -f $(srctree)/.config -o \
 513                  -d $(srctree)/include/config -o \
 514                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 515                 echo >&2 "***"; \
 516                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 517                 echo >&2 "*** in $(abs_srctree)";\
 518                 echo >&2 "***"; \
 519                 false; \
 520         fi
 521         $(Q)ln -fsn $(srctree) source
 522         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 523         $(Q)test -e .gitignore || \
 524         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 525 endif
 526
 527 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 528 ifneq ($(CROSS_COMPILE),)
 529 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 530 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 531 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 532 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 533 endif
 534 ifneq ($(GCC_TOOLCHAIN),)
 535 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 536 endif
 537 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 538 CLANG_FLAGS     += -no-integrated-as
 539 endif
 540 CLANG_FLAGS     += -Werror=unknown-warning-option
 541 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 542 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 543 export CLANG_FLAGS
 544 endif
 545
 546 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 547 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 548 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 549 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 550 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 551
 552 ifdef config-build
 553 # ===========================================================================
 554 # *config targets only - make sure prerequisites are updated, and descend
 555 # in scripts/kconfig to make the *config target
 556
 557 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 558 # KBUILD_DEFCONFIG may point out an alternative default configuration
 559 # used for 'make defconfig'
 560 include arch/$(SRCARCH)/Makefile
 561 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 562
 563 config: outputmakefile scripts_basic FORCE
 564         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 565
 566 %config: outputmakefile scripts_basic FORCE
 567         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 568
 569 else #!config-build
 570 # ===========================================================================
 571 # Build targets only - this includes vmlinux, arch specific targets, clean
 572 # targets and others. In general all targets except *config targets.
 573
 574 # If building an external module we do not care about the all: rule
 575 # but instead _all depend on modules
 576 PHONY += all
 577 ifeq ($(KBUILD_EXTMOD),)
 578 _all: all
 579 else
 580 _all: modules
 581 endif
 582
 583 # Decide whether to build built-in, modular, or both.
 584 # Normally, just do built-in.
 585
 586 KBUILD_MODULES :=
 587 KBUILD_BUILTIN := 1
 588
 589 # If we have only "make modules", don't compile built-in objects.
 590 ifeq ($(MAKECMDGOALS),modules)
 591   KBUILD_BUILTIN :=
 592 endif
 593
 594 # If we have "make <whatever> modules", compile modules
 595 # in addition to whatever we do anyway.
 596 # Just "make" or "make all" shall build modules as well
 597
 598 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 599   KBUILD_MODULES := 1
 600 endif
 601
 602 ifeq ($(MAKECMDGOALS),)
 603   KBUILD_MODULES := 1
 604 endif
 605
 606 export KBUILD_MODULES KBUILD_BUILTIN
 607
 608 ifdef need-config
 609 include include/config/auto.conf
 610 endif
 611
 612 ifeq ($(KBUILD_EXTMOD),)
 613 # Objects we will link into vmlinux / subdirs we need to visit
 614 init-y          := init/
 615 drivers-y       := drivers/ sound/
 616 drivers-$(CONFIG_SAMPLES) += samples/
 617 net-y           := net/
 618 libs-y          := lib/
 619 core-y          := usr/
 620 virt-y          := virt/
 621 endif # KBUILD_EXTMOD
 622
 623 # The all: target is the default when no target is given on the
 624 # command line.
 625 # This allow a user to issue only 'make' to build a kernel including modules
 626 # Defaults to vmlinux, but the arch makefile usually adds further targets
 627 all: vmlinux
 628
 629 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 630         $(call cc-option,-fno-tree-loop-im) \
 631         $(call cc-disable-warning,maybe-uninitialized,)
 632 export CFLAGS_GCOV
 633
 634 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 635 ifdef CONFIG_FUNCTION_TRACER
 636   CC_FLAGS_FTRACE := -pg
 637 endif
 638
 639 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 640 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 641 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 642 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 643 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 644 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 645 export RETPOLINE_CFLAGS
 646 export RETPOLINE_VDSO_CFLAGS
 647
 648 include arch/$(SRCARCH)/Makefile
 649
 650 ifdef need-config
 651 ifdef may-sync-config
 652 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 653 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 654 # because some architectures define CROSS_COMPILE there.
 655 include include/config/auto.conf.cmd
 656
 657 $(KCONFIG_CONFIG):
 658         @echo >&2 '***'
 659         @echo >&2 '*** Configuration file "$@" not found!'
 660         @echo >&2 '***'
 661         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 662         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 663         @echo >&2 '***'
 664         @/bin/false
 665
 666 # The actual configuration files used during the build are stored in
 667 # include/generated/ and include/config/. Update them if .config is newer than
 668 # include/config/auto.conf (which mirrors .config).
 669 #
 670 # This exploits the 'multi-target pattern rule' trick.
 671 # The syncconfig should be executed only once to make all the targets.
 672 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 673         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 674 else # !may-sync-config
 675 # External modules and some install targets need include/generated/autoconf.h
 676 # and include/config/auto.conf but do not care if they are up-to-date.
 677 # Use auto.conf to trigger the test
 678 PHONY += include/config/auto.conf
 679
 680 include/config/auto.conf:
 681         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 682         echo >&2;                                                       \
 683         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 684         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 685         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 686         echo >&2 ;                                                      \
 687         /bin/false)
 688
 689 endif # may-sync-config
 690 endif # need-config
 691
 692 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 693 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 694 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 695 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 696 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 697
 698 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 699 KBUILD_CFLAGS += -O2
 700 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 701 KBUILD_CFLAGS += -O3
 702 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 703 KBUILD_CFLAGS += -Os
 704 endif
 705
 706 # Tell gcc to never replace conditional load with a non-conditional one
 707 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 708 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 709
 710 include scripts/Makefile.kcov
 711 include scripts/Makefile.gcc-plugins
 712
 713 ifdef CONFIG_READABLE_ASM
 714 # Disable optimizations that make assembler listings hard to read.
 715 # reorder blocks reorders the control in the function
 716 # ipa clone creates specialized cloned functions
 717 # partial inlining inlines only parts of functions
 718 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 719                  $(call cc-option,-fno-ipa-cp-clone,) \
 720                  $(call cc-option,-fno-partial-inlining)
 721 endif
 722
 723 ifneq ($(CONFIG_FRAME_WARN),0)
 724 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 725 endif
 726
 727 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 728 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 729 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 730
 731 KBUILD_CFLAGS += $(stackp-flags-y)
 732
 733 ifdef CONFIG_CC_IS_CLANG
 734 KBUILD_CPPFLAGS += -Qunused-arguments
 735 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 736 KBUILD_CFLAGS += -Wno-gnu
 737 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 738 KBUILD_CFLAGS += -Wno-tautological-compare
 739 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 740 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 741 # See modpost pattern 2
 742 KBUILD_CFLAGS += -mno-global-merge
 743 else
 744
 745 # These warnings generated too much noise in a regular build.
 746 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 747 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 748
 749 # Warn about unmarked fall-throughs in switch statement.
 750 # Disabled for clang while comment to attribute conversion happens and
 751 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 752 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 753 endif
 754
 755 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 756 ifdef CONFIG_FRAME_POINTER
 757 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 758 else
 759 # Some targets (ARM with Thumb2, for example), can't be built with frame
 760 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 761 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 762 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 763 # -fomit-frame-pointer with FUNCTION_TRACER.
 764 ifndef CONFIG_FUNCTION_TRACER
 765 KBUILD_CFLAGS   += -fomit-frame-pointer
 766 endif
 767 endif
 768
 769 # Initialize all stack variables with a pattern, if desired.
 770 ifdef CONFIG_INIT_STACK_ALL
 771 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 772 endif
 773
 774 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 775
 776 ifdef CONFIG_DEBUG_INFO
 777 ifdef CONFIG_DEBUG_INFO_SPLIT
 778 DEBUG_CFLAGS    += -gsplit-dwarf
 779 else
 780 DEBUG_CFLAGS    += -g
 781 endif
 782 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 783 endif
 784 ifdef CONFIG_DEBUG_INFO_DWARF4
 785 DEBUG_CFLAGS    += -gdwarf-4
 786 endif
 787
 788 ifdef CONFIG_DEBUG_INFO_REDUCED
 789 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 790                    $(call cc-option,-fno-var-tracking)
 791 endif
 792
 793 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 794 export DEBUG_CFLAGS
 795
 796 ifdef CONFIG_FUNCTION_TRACER
 797 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 798   # gcc 5 supports generating the mcount tables directly
 799   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 800     CC_FLAGS_FTRACE     += -mrecord-mcount
 801     export CC_USING_RECORD_MCOUNT := 1
 802   endif
 803   ifdef CONFIG_HAVE_NOP_MCOUNT
 804     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 805       CC_FLAGS_FTRACE   += -mnop-mcount
 806       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 807     endif
 808   endif
 809 endif
 810 ifdef CONFIG_HAVE_FENTRY
 811   ifeq ($(call cc-option-yn, -mfentry),y)
 812     CC_FLAGS_FTRACE     += -mfentry
 813     CC_FLAGS_USING      += -DCC_USING_FENTRY
 814   endif
 815 endif
 816 export CC_FLAGS_FTRACE
 817 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 818 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 819 ifdef CONFIG_DYNAMIC_FTRACE
 820         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 821                 BUILD_C_RECORDMCOUNT := y
 822                 export BUILD_C_RECORDMCOUNT
 823         endif
 824 endif
 825 endif
 826
 827 # We trigger additional mismatches with less inlining
 828 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 829 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 830 endif
 831
 832 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 833 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 834 LDFLAGS_vmlinux += --gc-sections
 835 endif
 836
 837 ifdef CONFIG_LIVEPATCH
 838 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 839 endif
 840
 841 # arch Makefile may override CC so keep this after arch Makefile is included
 842 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 843
 844 # warn about C99 declaration after statement
 845 KBUILD_CFLAGS += -Wdeclaration-after-statement
 846
 847 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 848 KBUILD_CFLAGS += -Wvla
 849
 850 # disable pointer signed / unsigned warnings in gcc 4.0
 851 KBUILD_CFLAGS += -Wno-pointer-sign
 852
 853 # disable stringop warnings in gcc 8+
 854 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 855
 856 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 857 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 858 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 859 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 860
 861 # Another good warning that we'll want to enable eventually
 862 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 863
 864 # Enabled with W=2, disabled by default as noisy
 865 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 866
 867 # disable invalid "can't wrap" optimizations for signed / pointers
 868 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 869
 870 # clang sets -fmerge-all-constants by default as optimization, but this
 871 # is non-conforming behavior for C and in fact breaks the kernel, so we
 872 # need to disable it here generally.
 873 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 874
 875 # for gcc -fno-merge-all-constants disables everything, but it is fine
 876 # to have actual conforming behavior enabled.
 877 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 878
 879 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 880 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 881
 882 # conserve stack if available
 883 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 884
 885 # Prohibit date/time macros, which would make the build non-deterministic
 886 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 887
 888 # enforce correct pointer usage
 889 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 890
 891 # Require designated initializers for all marked structures
 892 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 893
 894 # change __FILE__ to the relative path from the srctree
 895 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 896
 897 # ensure -fcf-protection is disabled when using retpoline as it is
 898 # incompatible with -mindirect-branch=thunk-extern
 899 ifdef CONFIG_RETPOLINE
 900 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 901 endif
 902
 903 include scripts/Makefile.kasan
 904 include scripts/Makefile.extrawarn
 905 include scripts/Makefile.ubsan
 906
 907 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 908 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 909 KBUILD_AFLAGS   += $(KAFLAGS)
 910 KBUILD_CFLAGS   += $(KCFLAGS)
 911
 912 KBUILD_LDFLAGS_MODULE += --build-id
 913 LDFLAGS_vmlinux += --build-id
 914
 915 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 916 LDFLAGS_vmlinux += $(call ld-option, -X,)
 917 endif
 918
 919 ifeq ($(CONFIG_RELR),y)
 920 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
 921 endif
 922
 923 # make the checker run with the right architecture
 924 CHECKFLAGS += --arch=$(ARCH)
 925
 926 # insure the checker run with the right endianness
 927 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 928
 929 # the checker needs the correct machine size
 930 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 931
 932 # Default kernel image to build when no specific target is given.
 933 # KBUILD_IMAGE may be overruled on the command line or
 934 # set in the environment
 935 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 936 # this default value
 937 export KBUILD_IMAGE ?= vmlinux
 938
 939 #
 940 # INSTALL_PATH specifies where to place the updated kernel and system map
 941 # images. Default is /boot, but you can set it to other values
 942 export  INSTALL_PATH ?= /boot
 943
 944 #
 945 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 946 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 947 # an argument if needed. Otherwise it defaults to the kernel install path
 948 #
 949 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 950
 951 #
 952 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 953 # relocations required by build roots.  This is not defined in the
 954 # makefile but the argument can be passed to make if needed.
 955 #
 956
 957 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 958 export MODLIB
 959
 960 #
 961 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 962 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 963 # the default option --strip-debug will be used.  Otherwise,
 964 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 965
 966 ifdef INSTALL_MOD_STRIP
 967 ifeq ($(INSTALL_MOD_STRIP),1)
 968 mod_strip_cmd = $(STRIP) --strip-debug
 969 else
 970 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 971 endif # INSTALL_MOD_STRIP=1
 972 else
 973 mod_strip_cmd = true
 974 endif # INSTALL_MOD_STRIP
 975 export mod_strip_cmd
 976
 977 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 978 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 979 # or CONFIG_MODULE_COMPRESS_XZ.
 980
 981 mod_compress_cmd = true
 982 ifdef CONFIG_MODULE_COMPRESS
 983   ifdef CONFIG_MODULE_COMPRESS_GZIP
 984     mod_compress_cmd = gzip -n -f
 985   endif # CONFIG_MODULE_COMPRESS_GZIP
 986   ifdef CONFIG_MODULE_COMPRESS_XZ
 987     mod_compress_cmd = xz -f
 988   endif # CONFIG_MODULE_COMPRESS_XZ
 989 endif # CONFIG_MODULE_COMPRESS
 990 export mod_compress_cmd
 991
 992 ifdef CONFIG_MODULE_SIG_ALL
 993 $(eval $(call config_filename,MODULE_SIG_KEY))
 994
 995 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 996 else
 997 mod_sign_cmd = true
 998 endif
 999 export mod_sign_cmd
1000
1001 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1002
1003 ifdef CONFIG_STACK_VALIDATION
1004   has_libelf := $(call try-run,\
1005                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1006   ifeq ($(has_libelf),1)
1007     objtool_target := tools/objtool FORCE
1008   else
1009     SKIP_STACK_VALIDATION := 1
1010     export SKIP_STACK_VALIDATION
1011   endif
1012 endif
1013
1014 PHONY += prepare0
1015
1016 export MODORDER := $(extmod-prefix)modules.order
1017
1018 ifeq ($(KBUILD_EXTMOD),)
1019 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1020
1021 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1022                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1023                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1024
1025 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1026                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1027                         $(drivers-) $(net-) $(libs-) $(virt-))))
1028
1029 build-dirs      := $(vmlinux-dirs)
1030 clean-dirs      := $(vmlinux-alldirs)
1031
1032 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1033 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1034 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1035 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1036 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1037 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1038 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1039
1040 # Externally visible symbols (used by link-vmlinux.sh)
1041 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1042                               $(drivers-y) $(net-y) $(virt-y)
1043 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1044 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1045 export LDFLAGS_vmlinux
1046 # used by scripts/Makefile.package
1047 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1048
1049 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1050
1051 # Recurse until adjust_autoksyms.sh is satisfied
1052 PHONY += autoksyms_recursive
1053 ifdef CONFIG_TRIM_UNUSED_KSYMS
1054 autoksyms_recursive: descend modules.order
1055         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1056           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1057 endif
1058
1059 # For the kernel to actually contain only the needed exported symbols,
1060 # we have to build modules as well to determine what those symbols are.
1061 # (this can be evaluated only once include/config/auto.conf has been included)
1062 ifdef CONFIG_TRIM_UNUSED_KSYMS
1063   KBUILD_MODULES := 1
1064 endif
1065
1066 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1067
1068 $(autoksyms_h):
1069         $(Q)mkdir -p $(dir $@)
1070         $(Q)touch $@
1071
1072 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1073
1074 # Final link of vmlinux with optional arch pass after final link
1075 cmd_link-vmlinux =                                                 \
1076         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1077         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1078
1079 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1080         +$(call if_changed,link-vmlinux)
1081
1082 targets := vmlinux
1083
1084 # The actual objects are generated when descending,
1085 # make sure no implicit rule kicks in
1086 $(sort $(vmlinux-deps)): descend ;
1087
1088 filechk_kernel.release = \
1089         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1090
1091 # Store (new) KERNELRELEASE string in include/config/kernel.release
1092 include/config/kernel.release: FORCE
1093         $(call filechk,kernel.release)
1094
1095 # Additional helpers built in scripts/
1096 # Carefully list dependencies so we do not try to build scripts twice
1097 # in parallel
1098 PHONY += scripts
1099 scripts: scripts_basic scripts_dtc
1100         $(Q)$(MAKE) $(build)=$(@)
1101
1102 # Things we need to do before we recursively start building the kernel
1103 # or the modules are listed in "prepare".
1104 # A multi level approach is used. prepareN is processed before prepareN-1.
1105 # archprepare is used in arch Makefiles and when processed asm symlink,
1106 # version.h and scripts_basic is processed / created.
1107
1108 PHONY += prepare archprepare
1109
1110 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1111         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1112
1113 prepare0: archprepare
1114         $(Q)$(MAKE) $(build)=scripts/mod
1115         $(Q)$(MAKE) $(build)=.
1116
1117 # All the preparing..
1118 prepare: prepare0 prepare-objtool
1119
1120 # Support for using generic headers in asm-generic
1121 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1122
1123 PHONY += asm-generic uapi-asm-generic
1124 asm-generic: uapi-asm-generic
1125         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1126         generic=include/asm-generic
1127 uapi-asm-generic:
1128         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1129         generic=include/uapi/asm-generic
1130
1131 PHONY += prepare-objtool
1132 prepare-objtool: $(objtool_target)
1133 ifeq ($(SKIP_STACK_VALIDATION),1)
1134 ifdef CONFIG_UNWINDER_ORC
1135         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1136         @false
1137 else
1138         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1139 endif
1140 endif
1141
1142 # Generate some files
1143 # ---------------------------------------------------------------------------
1144
1145 # KERNELRELEASE can change from a few different places, meaning version.h
1146 # needs to be updated, so this check is forced on all builds
1147
1148 uts_len := 64
1149 define filechk_utsrelease.h
1150         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1151           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1152           exit 1;                                                         \
1153         fi;                                                               \
1154         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1155 endef
1156
1157 define filechk_version.h
1158         echo \#define LINUX_VERSION_CODE $(shell                         \
1159         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1160         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1161 endef
1162
1163 $(version_h): FORCE
1164         $(call filechk,version.h)
1165         $(Q)rm -f $(old_version_h)
1166
1167 include/generated/utsrelease.h: include/config/kernel.release FORCE
1168         $(call filechk,utsrelease.h)
1169
1170 PHONY += headerdep
1171 headerdep:
1172         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1173         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1174
1175 # ---------------------------------------------------------------------------
1176 # Kernel headers
1177
1178 #Default location for installed headers
1179 export INSTALL_HDR_PATH = $(objtree)/usr
1180
1181 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1182       cmd_headers_install = \
1183         mkdir -p $(INSTALL_HDR_PATH); \
1184         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1185         usr/include $(INSTALL_HDR_PATH)
1186
1187 PHONY += headers_install
1188 headers_install: headers
1189         $(call cmd,headers_install)
1190
1191 PHONY += archheaders archscripts
1192
1193 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1194
1195 PHONY += headers
1196 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1197         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1198           $(error Headers not exportable for the $(SRCARCH) architecture))
1199         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1200         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1201
1202 # Deprecated. It is no-op now.
1203 PHONY += headers_check
1204 headers_check:
1205         @:
1206
1207 ifdef CONFIG_HEADERS_INSTALL
1208 prepare: headers
1209 endif
1210
1211 PHONY += scripts_unifdef
1212 scripts_unifdef: scripts_basic
1213         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1214
1215 # ---------------------------------------------------------------------------
1216 # Kernel selftest
1217
1218 PHONY += kselftest
1219 kselftest:
1220         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1221
1222 kselftest-%: FORCE
1223         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1224
1225 PHONY += kselftest-merge
1226 kselftest-merge:
1227         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1228         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1229                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1230         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1231
1232 # ---------------------------------------------------------------------------
1233 # Devicetree files
1234
1235 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1236 dtstree := arch/$(SRCARCH)/boot/dts
1237 endif
1238
1239 ifneq ($(dtstree),)
1240
1241 %.dtb: include/config/kernel.release scripts_dtc
1242         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1243
1244 PHONY += dtbs dtbs_install dtbs_check
1245 dtbs: include/config/kernel.release scripts_dtc
1246         $(Q)$(MAKE) $(build)=$(dtstree)
1247
1248 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1249 dtbs: dt_binding_check
1250 endif
1251
1252 dtbs_check: export CHECK_DTBS=1
1253 dtbs_check: dtbs
1254
1255 dtbs_install:
1256         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1257
1258 ifdef CONFIG_OF_EARLY_FLATTREE
1259 all: dtbs
1260 endif
1261
1262 endif
1263
1264 PHONY += scripts_dtc
1265 scripts_dtc: scripts_basic
1266         $(Q)$(MAKE) $(build)=scripts/dtc
1267
1268 PHONY += dt_binding_check
1269 dt_binding_check: scripts_dtc
1270         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1271
1272 # ---------------------------------------------------------------------------
1273 # Modules
1274
1275 ifdef CONFIG_MODULES
1276
1277 # By default, build modules as well
1278
1279 all: modules
1280
1281 # When we're building modules with modversions, we need to consider
1282 # the built-in objects during the descend as well, in order to
1283 # make sure the checksums are up to date before we record them.
1284 ifdef CONFIG_MODVERSIONS
1285   KBUILD_BUILTIN := 1
1286 endif
1287
1288 # Build modules
1289 #
1290 # A module can be listed more than once in obj-m resulting in
1291 # duplicate lines in modules.order files.  Those are removed
1292 # using awk while concatenating to the final file.
1293
1294 PHONY += modules
1295 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1296         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1297         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1298
1299 modules.order: descend
1300         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1301
1302 modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1303
1304 modules.builtin: $(modbuiltin-dirs)
1305         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1306
1307 PHONY += $(modbuiltin-dirs)
1308 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1309 # here to make it self-healing in case somebody accidentally removes it.
1310 $(modbuiltin-dirs): include/config/tristate.conf
1311         $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1312
1313 # Target to prepare building external modules
1314 PHONY += modules_prepare
1315 modules_prepare: prepare
1316
1317 # Target to install modules
1318 PHONY += modules_install
1319 modules_install: _modinst_ _modinst_post
1320
1321 PHONY += _modinst_
1322 _modinst_:
1323         @rm -rf $(MODLIB)/kernel
1324         @rm -f $(MODLIB)/source
1325         @mkdir -p $(MODLIB)/kernel
1326         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1327         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1328                 rm -f $(MODLIB)/build ; \
1329                 ln -s $(CURDIR) $(MODLIB)/build ; \
1330         fi
1331         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1332         @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1333         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1334         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1335
1336 # This depmod is only for convenience to give the initial
1337 # boot a modules.dep even before / is mounted read-write.  However the
1338 # boot script depmod is the master version.
1339 PHONY += _modinst_post
1340 _modinst_post: _modinst_
1341         $(call cmd,depmod)
1342
1343 ifeq ($(CONFIG_MODULE_SIG), y)
1344 PHONY += modules_sign
1345 modules_sign:
1346         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1347 endif
1348
1349 else # CONFIG_MODULES
1350
1351 # Modules not configured
1352 # ---------------------------------------------------------------------------
1353
1354 PHONY += modules modules_install
1355 modules modules_install:
1356         @echo >&2
1357         @echo >&2 "The present kernel configuration has modules disabled."
1358         @echo >&2 "Type 'make config' and enable loadable module support."
1359         @echo >&2 "Then build a kernel with module support enabled."
1360         @echo >&2
1361         @exit 1
1362
1363 endif # CONFIG_MODULES
1364
1365 ###
1366 # Cleaning is done on three levels.
1367 # make clean     Delete most generated files
1368 #                Leave enough to build external modules
1369 # make mrproper  Delete the current configuration, and all generated files
1370 # make distclean Remove editor backup files, patch leftover files and the like
1371
1372 # Directories & files removed with 'make clean'
1373 CLEAN_DIRS  += include/ksym
1374 CLEAN_FILES += modules.builtin.modinfo
1375
1376 # Directories & files removed with 'make mrproper'
1377 MRPROPER_DIRS  += include/config include/generated          \
1378                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1379                   debian/ snap/ tar-install/
1380 MRPROPER_FILES += .config .config.old .version \
1381                   Module.symvers \
1382                   signing_key.pem signing_key.priv signing_key.x509     \
1383                   x509.genkey extra_certificates signing_key.x509.keyid \
1384                   signing_key.x509.signer vmlinux-gdb.py \
1385                   *.spec
1386
1387 # Directories & files removed with 'make distclean'
1388 DISTCLEAN_DIRS  +=
1389 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1390
1391 # clean - Delete most, but leave enough to build external modules
1392 #
1393 clean: rm-dirs  := $(CLEAN_DIRS)
1394 clean: rm-files := $(CLEAN_FILES)
1395
1396 PHONY += archclean vmlinuxclean
1397
1398 vmlinuxclean:
1399         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1400         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1401
1402 clean: archclean vmlinuxclean
1403
1404 # mrproper - Delete all generated files, including .config
1405 #
1406 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1407 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1408 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1409
1410 PHONY += $(mrproper-dirs) mrproper
1411 $(mrproper-dirs):
1412         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1413
1414 mrproper: clean $(mrproper-dirs)
1415         $(call cmd,rmdirs)
1416         $(call cmd,rmfiles)
1417
1418 # distclean
1419 #
1420 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1421 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1422
1423 PHONY += distclean
1424
1425 distclean: mrproper
1426         $(call cmd,rmdirs)
1427         $(call cmd,rmfiles)
1428         @find $(srctree) $(RCS_FIND_IGNORE) \
1429                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1430                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1431                 -o -name 'core' \) \
1432                 -type f -print | xargs rm -f
1433
1434
1435 # Packaging of the kernel to various formats
1436 # ---------------------------------------------------------------------------
1437
1438 %src-pkg: FORCE
1439         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1440 %pkg: include/config/kernel.release FORCE
1441         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1442
1443 # Brief documentation of the typical targets used
1444 # ---------------------------------------------------------------------------
1445
1446 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1447 boards := $(sort $(notdir $(boards)))
1448 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1449 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1450
1451 PHONY += help
1452 help:
1453         @echo  'Cleaning targets:'
1454         @echo  '  clean           - Remove most generated files but keep the config and'
1455         @echo  '                    enough build support to build external modules'
1456         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1457         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1458         @echo  ''
1459         @echo  'Configuration targets:'
1460         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1461         @echo  ''
1462         @echo  'Other generic targets:'
1463         @echo  '  all             - Build all targets marked with [*]'
1464         @echo  '* vmlinux         - Build the bare kernel'
1465         @echo  '* modules         - Build all modules'
1466         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1467         @echo  '  dir/            - Build all files in dir and below'
1468         @echo  '  dir/file.[ois]  - Build specified target only'
1469         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1470         @echo  '                    (requires compiler support for LLVM assembly generation)'
1471         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1472         @echo  '                    (requires a recent binutils and recent build (System.map))'
1473         @echo  '  dir/file.ko     - Build module including final link'
1474         @echo  '  modules_prepare - Set up for building external modules'
1475         @echo  '  tags/TAGS       - Generate tags file for editors'
1476         @echo  '  cscope          - Generate cscope index'
1477         @echo  '  gtags           - Generate GNU GLOBAL index'
1478         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1479         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1480         @echo  '  image_name      - Output the image name (use with make -s)'
1481         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1482          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1483          echo  ''
1484         @echo  'Static analysers:'
1485         @echo  '  checkstack      - Generate a list of stack hogs'
1486         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1487         @echo  '  versioncheck    - Sanity check on version.h usage'
1488         @echo  '  includecheck    - Check for duplicate included header files'
1489         @echo  '  export_report   - List the usages of all exported symbols'
1490         @echo  '  headerdep       - Detect inclusion cycles in headers'
1491         @echo  '  coccicheck      - Check with Coccinelle'
1492         @echo  ''
1493         @echo  'Tools:'
1494         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1495         @echo  ''
1496         @echo  'Kernel selftest:'
1497         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1498         @echo  '                    Build, install, and boot kernel before'
1499         @echo  '                    running kselftest on it'
1500         @echo  '  kselftest-clean - Remove all generated kselftest files'
1501         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1502         @echo  '                    .config.'
1503         @echo  ''
1504         @$(if $(dtstree), \
1505                 echo 'Devicetree:'; \
1506                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1507                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1508                 echo '  dt_binding_check - Validate device tree binding documents'; \
1509                 echo '  dtbs_check       - Validate device tree source files';\
1510                 echo '')
1511
1512         @echo 'Userspace tools targets:'
1513         @echo '  use "make tools/help"'
1514         @echo '  or  "cd tools; make help"'
1515         @echo  ''
1516         @echo  'Kernel packaging:'
1517         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1518         @echo  ''
1519         @echo  'Documentation targets:'
1520         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1521         @echo  ''
1522         @echo  'Architecture specific targets ($(SRCARCH)):'
1523         @$(if $(archhelp),$(archhelp),\
1524                 echo '  No architecture specific help defined for $(SRCARCH)')
1525         @echo  ''
1526         @$(if $(boards), \
1527                 $(foreach b, $(boards), \
1528                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1529                 echo '')
1530         @$(if $(board-dirs), \
1531                 $(foreach b, $(board-dirs), \
1532                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1533                 printf "  %-16s - Show all of the above\\n" help-boards; \
1534                 echo '')
1535
1536         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1537         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1538         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1539         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1540         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1541         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1542         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1543         @echo  '                1: warnings which may be relevant and do not occur too often'
1544         @echo  '                2: warnings which occur quite often but may still be relevant'
1545         @echo  '                3: more obscure warnings, can most likely be ignored'
1546         @echo  '                Multiple levels can be combined with W=12 or W=123'
1547         @echo  ''
1548         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1549         @echo  'For further info see the ./README file'
1550
1551
1552 help-board-dirs := $(addprefix help-,$(board-dirs))
1553
1554 help-boards: $(help-board-dirs)
1555
1556 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1557
1558 $(help-board-dirs): help-%:
1559         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1560         @$(if $(boards-per-dir), \
1561                 $(foreach b, $(boards-per-dir), \
1562                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1563                 echo '')
1564
1565
1566 # Documentation targets
1567 # ---------------------------------------------------------------------------
1568 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1569                linkcheckdocs dochelp refcheckdocs
1570 PHONY += $(DOC_TARGETS)
1571 $(DOC_TARGETS):
1572         $(Q)$(MAKE) $(build)=Documentation $@
1573
1574 # Misc
1575 # ---------------------------------------------------------------------------
1576
1577 PHONY += scripts_gdb
1578 scripts_gdb: prepare0
1579         $(Q)$(MAKE) $(build)=scripts/gdb
1580         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1581
1582 ifdef CONFIG_GDB_SCRIPTS
1583 all: scripts_gdb
1584 endif
1585
1586 else # KBUILD_EXTMOD
1587
1588 ###
1589 # External module support.
1590 # When building external modules the kernel used as basis is considered
1591 # read-only, and no consistency checks are made and the make
1592 # system is not used on the basis kernel. If updates are required
1593 # in the basis kernel ordinary make commands (without M=...) must
1594 # be used.
1595 #
1596 # The following are the only valid targets when building external
1597 # modules.
1598 # make M=dir clean     Delete all automatically generated files
1599 # make M=dir modules   Make all modules in specified dir
1600 # make M=dir           Same as 'make M=dir modules'
1601 # make M=dir modules_install
1602 #                      Install the modules built in the module directory
1603 #                      Assumes install directory is already created
1604
1605 # We are always building modules
1606 KBUILD_MODULES := 1
1607
1608 PHONY += $(objtree)/Module.symvers
1609 $(objtree)/Module.symvers:
1610         @test -e $(objtree)/Module.symvers || ( \
1611         echo; \
1612         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1613         echo "           is missing; modules will have no dependencies and modversions."; \
1614         echo )
1615
1616 build-dirs := $(KBUILD_EXTMOD)
1617 PHONY += modules
1618 modules: descend $(objtree)/Module.symvers
1619         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1620
1621 PHONY += modules_install
1622 modules_install: _emodinst_ _emodinst_post
1623
1624 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1625 PHONY += _emodinst_
1626 _emodinst_:
1627         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1628         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1629
1630 PHONY += _emodinst_post
1631 _emodinst_post: _emodinst_
1632         $(call cmd,depmod)
1633
1634 clean-dirs := $(KBUILD_EXTMOD)
1635 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1636
1637 PHONY += /
1638 /:
1639         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1640
1641 PHONY += help
1642 help:
1643         @echo  '  Building external modules.'
1644         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1645         @echo  ''
1646         @echo  '  modules         - default target, build the module(s)'
1647         @echo  '  modules_install - install the module'
1648         @echo  '  clean           - remove generated files in module directory only'
1649         @echo  ''
1650
1651 PHONY += prepare
1652 endif # KBUILD_EXTMOD
1653
1654 # Single targets
1655 # ---------------------------------------------------------------------------
1656 # To build individual files in subdirectories, you can do like this:
1657 #
1658 #   make foo/bar/baz.s
1659 #
1660 # The supported suffixes for single-target are listed in 'single-targets'
1661 #
1662 # To build only under specific subdirectories, you can do like this:
1663 #
1664 #   make foo/bar/baz/
1665
1666 ifdef single-build
1667
1668 # .ko is special because modpost is needed
1669 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1670 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1671
1672 $(single-ko): single_modpost
1673         @:
1674 $(single-no-ko): descend
1675         @:
1676
1677 ifeq ($(KBUILD_EXTMOD),)
1678 # For the single build of in-tree modules, use a temporary file to avoid
1679 # the situation of modules_install installing an invalid modules.order.
1680 MODORDER := .modules.tmp
1681 endif
1682
1683 PHONY += single_modpost
1684 single_modpost: $(single-no-ko)
1685         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1686         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1687
1688 KBUILD_MODULES := 1
1689
1690 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1691
1692 # trim unrelated directories
1693 build-dirs := $(foreach d, $(build-dirs), \
1694                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1695
1696 endif
1697
1698 # Handle descending into subdirectories listed in $(build-dirs)
1699 # Preset locale variables to speed up the build process. Limit locale
1700 # tweaks to this spot to avoid wrong language settings when running
1701 # make menuconfig etc.
1702 # Error messages still appears in the original language
1703 PHONY += descend $(build-dirs)
1704 descend: $(build-dirs)
1705 $(build-dirs): prepare
1706         $(Q)$(MAKE) $(build)=$@ \
1707         single-build=$(if $(filter-out $@/, $(single-no-ko)),1) \
1708         need-builtin=1 need-modorder=1
1709
1710 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1711 PHONY += $(clean-dirs) clean
1712 $(clean-dirs):
1713         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1714
1715 clean: $(clean-dirs)
1716         $(call cmd,rmdirs)
1717         $(call cmd,rmfiles)
1718         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1719                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1720                 -o -name '*.ko.*' \
1721                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1722                 -o -name '*.dwo' -o -name '*.lst' \
1723                 -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
1724                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1725                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1726                 -o -name '*.asn1.[ch]' \
1727                 -o -name '*.symtypes' -o -name 'modules.order' \
1728                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1729                 -o -name '*.c.[012]*.*' \
1730                 -o -name '*.ll' \
1731                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1732
1733 # Generate tags for editors
1734 # ---------------------------------------------------------------------------
1735 quiet_cmd_tags = GEN     $@
1736       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1737
1738 tags TAGS cscope gtags: FORCE
1739         $(call cmd,tags)
1740
1741 # Script to generate missing namespace dependencies
1742 # ---------------------------------------------------------------------------
1743
1744 PHONY += nsdeps
1745
1746 nsdeps: modules
1747         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
1748         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1749
1750 # Scripts to check various things for consistency
1751 # ---------------------------------------------------------------------------
1752
1753 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1754
1755 includecheck:
1756         find $(srctree)/* $(RCS_FIND_IGNORE) \
1757                 -name '*.[hcS]' -type f -print | sort \
1758                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1759
1760 versioncheck:
1761         find $(srctree)/* $(RCS_FIND_IGNORE) \
1762                 -name '*.[hcS]' -type f -print | sort \
1763                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1764
1765 coccicheck:
1766         $(Q)$(BASH) $(srctree)/scripts/$@
1767
1768 namespacecheck:
1769         $(PERL) $(srctree)/scripts/namespace.pl
1770
1771 export_report:
1772         $(PERL) $(srctree)/scripts/export_report.pl
1773
1774 PHONY += checkstack kernelrelease kernelversion image_name
1775
1776 # UML needs a little special treatment here.  It wants to use the host
1777 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1778 # else wants $(ARCH), including people doing cross-builds, which means
1779 # that $(SUBARCH) doesn't work here.
1780 ifeq ($(ARCH), um)
1781 CHECKSTACK_ARCH := $(SUBARCH)
1782 else
1783 CHECKSTACK_ARCH := $(ARCH)
1784 endif
1785 checkstack:
1786         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1787         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1788
1789 kernelrelease:
1790         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1791
1792 kernelversion:
1793         @echo $(KERNELVERSION)
1794
1795 image_name:
1796         @echo $(KBUILD_IMAGE)
1797
1798 # Clear a bunch of variables before executing the submake
1799
1800 ifeq ($(quiet),silent_)
1801 tools_silent=s
1802 endif
1803
1804 tools/: FORCE
1805         $(Q)mkdir -p $(objtree)/tools
1806         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1807
1808 tools/%: FORCE
1809         $(Q)mkdir -p $(objtree)/tools
1810         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1811
1812 # FIXME Should go into a make.lib or something
1813 # ===========================================================================
1814
1815 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1816       cmd_rmdirs = rm -rf $(rm-dirs)
1817
1818 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1819       cmd_rmfiles = rm -f $(rm-files)
1820
1821 # Run depmod only if we have System.map and depmod is executable
1822 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1823       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1824                    $(KERNELRELEASE)
1825
1826 # read saved command lines for existing targets
1827 existing-targets := $(wildcard $(sort $(targets)))
1828
1829 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1830
1831 endif # config-targets
1832 endif # mixed-build
1833 endif # need-sub-make
1834
1835 PHONY += FORCE
1836 FORCE:
1837
1838 # Declare the contents of the PHONY variable as phony.  We keep that
1839 # information in a variable so we can use it in if_changed and friends.
1840 .PHONY: $(PHONY)