Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 6
   4 SUBLEVEL = 17
   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 $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
  72 #
  73 # To put more focus on warnings, be less verbose as default
  74 # Use 'make V=1' to see the full commands
  75
  76 ifeq ("$(origin V)", "command line")
  77   KBUILD_VERBOSE = $(V)
  78 endif
  79 ifndef KBUILD_VERBOSE
  80   KBUILD_VERBOSE = 0
  81 endif
  82
  83 ifeq ($(KBUILD_VERBOSE),1)
  84   quiet =
  85   Q =
  86 else
  87   quiet=quiet_
  88   Q = @
  89 endif
  90
  91 # If the user is running make -s (silent mode), suppress echoing of
  92 # commands
  93
  94 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  95   quiet=silent_
  96 endif
  97
  98 export quiet Q KBUILD_VERBOSE
  99
 100 # Kbuild will save output files in the current working directory.
 101 # This does not need to match to the root of the kernel source tree.
 102 #
 103 # For example, you can do this:
 104 #
 105 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 106 #
 107 # If you want to save output files in a different location, there are
 108 # two syntaxes to specify it.
 109 #
 110 # 1) O=
 111 # Use "make O=dir/to/store/output/files/"
 112 #
 113 # 2) Set KBUILD_OUTPUT
 114 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 115 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 116 #
 117 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 118 # variable.
 119
 120 # Do we want to change the working directory?
 121 ifeq ("$(origin O)", "command line")
 122   KBUILD_OUTPUT := $(O)
 123 endif
 124
 125 ifneq ($(KBUILD_OUTPUT),)
 126 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 127 # expand a shell special character '~'. We use a somewhat tedious way here.
 128 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 129 $(if $(abs_objtree),, \
 130      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 131
 132 # $(realpath ...) resolves symlinks
 133 abs_objtree := $(realpath $(abs_objtree))
 134 else
 135 abs_objtree := $(CURDIR)
 136 endif # ifneq ($(KBUILD_OUTPUT),)
 137
 138 ifeq ($(abs_objtree),$(CURDIR))
 139 # Suppress "Entering directory ..." unless we are changing the work directory.
 140 MAKEFLAGS += --no-print-directory
 141 else
 142 need-sub-make := 1
 143 endif
 144
 145 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 146
 147 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 148 $(error source directory cannot contain spaces or colons)
 149 endif
 150
 151 ifneq ($(abs_srctree),$(abs_objtree))
 152 # Look for make include files relative to root of kernel src
 153 #
 154 # This does not become effective immediately because MAKEFLAGS is re-parsed
 155 # once after the Makefile is read. We need to invoke sub-make.
 156 MAKEFLAGS += --include-dir=$(abs_srctree)
 157 need-sub-make := 1
 158 endif
 159
 160 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 161 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 162 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 163 need-sub-make := 1
 164 # Cancel implicit rules for this Makefile.
 165 $(lastword $(MAKEFILE_LIST)): ;
 166 endif
 167
 168 export abs_srctree abs_objtree
 169 export sub_make_done := 1
 170
 171 ifeq ($(need-sub-make),1)
 172
 173 PHONY += $(MAKECMDGOALS) sub-make
 174
 175 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 176         @:
 177
 178 # Invoke a second make in the output directory, passing relevant variables
 179 sub-make:
 180         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 181
 182 endif # need-sub-make
 183 endif # sub_make_done
 184
 185 # We process the rest of the Makefile if this is the final invocation of make
 186 ifeq ($(need-sub-make),)
 187
 188 # Do not print "Entering directory ...",
 189 # but we want to display it when entering to the output directory
 190 # so that IDEs/editors are able to understand relative filenames.
 191 MAKEFLAGS += --no-print-directory
 192
 193 # Call a source code checker (by default, "sparse") as part of the
 194 # C compilation.
 195 #
 196 # Use 'make C=1' to enable checking of only re-compiled files.
 197 # Use 'make C=2' to enable checking of *all* source files, regardless
 198 # of whether they are re-compiled or not.
 199 #
 200 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 201 # including where to get the "sparse" utility.
 202
 203 ifeq ("$(origin C)", "command line")
 204   KBUILD_CHECKSRC = $(C)
 205 endif
 206 ifndef KBUILD_CHECKSRC
 207   KBUILD_CHECKSRC = 0
 208 endif
 209
 210 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 211 # directory of external module to build. Setting M= takes precedence.
 212 ifeq ("$(origin M)", "command line")
 213   KBUILD_EXTMOD := $(M)
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD
 217
 218 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 219
 220 ifeq ($(abs_srctree),$(abs_objtree))
 221         # building in the source tree
 222         srctree := .
 223         building_out_of_srctree :=
 224 else
 225         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 226                 # building in a subdirectory of the source tree
 227                 srctree := ..
 228         else
 229                 srctree := $(abs_srctree)
 230         endif
 231         building_out_of_srctree := 1
 232 endif
 233
 234 ifneq ($(KBUILD_ABS_SRCTREE),)
 235 srctree := $(abs_srctree)
 236 endif
 237
 238 objtree         := .
 239 VPATH           := $(srctree)
 240
 241 export building_out_of_srctree srctree objtree VPATH
 242
 243 # To make sure we do not include .config for any of the *config targets
 244 # catch them early, and hand them over to scripts/kconfig/Makefile
 245 # It is allowed to specify more targets when calling make, including
 246 # mixing *config targets and build targets.
 247 # For example 'make oldconfig all'.
 248 # Detect when mixed targets is specified, and make a second invocation
 249 # of make so .config is not included in this case either (for *config).
 250
 251 version_h := include/generated/uapi/linux/version.h
 252 old_version_h := include/linux/version.h
 253
 254 clean-targets := %clean mrproper cleandocs
 255 no-dot-config-targets := $(clean-targets) \
 256                          cscope gtags TAGS tags help% %docs check% coccicheck \
 257                          $(version_h) headers headers_% archheaders archscripts \
 258                          %asm-generic kernelversion %src-pkg
 259 no-sync-config-targets := $(no-dot-config-targets) install %install \
 260                            kernelrelease
 261 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 262
 263 config-build    :=
 264 mixed-build     :=
 265 need-config     := 1
 266 may-sync-config := 1
 267 single-build    :=
 268
 269 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 270         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 271                 need-config :=
 272         endif
 273 endif
 274
 275 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 276         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 277                 may-sync-config :=
 278         endif
 279 endif
 280
 281 ifneq ($(KBUILD_EXTMOD),)
 282         may-sync-config :=
 283 endif
 284
 285 ifeq ($(KBUILD_EXTMOD),)
 286         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 287                 config-build := 1
 288                 ifneq ($(words $(MAKECMDGOALS)),1)
 289                         mixed-build := 1
 290                 endif
 291         endif
 292 endif
 293
 294 # We cannot build single targets and the others at the same time
 295 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 296         single-build := 1
 297         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 298                 mixed-build := 1
 299         endif
 300 endif
 301
 302 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 303 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 304         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 305                 mixed-build := 1
 306         endif
 307 endif
 308
 309 # install and modules_install need also be processed one by one
 310 ifneq ($(filter install,$(MAKECMDGOALS)),)
 311         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 312                 mixed-build := 1
 313         endif
 314 endif
 315
 316 ifdef mixed-build
 317 # ===========================================================================
 318 # We're called with mixed targets (*config and build targets).
 319 # Handle them one by one.
 320
 321 PHONY += $(MAKECMDGOALS) __build_one_by_one
 322
 323 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 324         @:
 325
 326 __build_one_by_one:
 327         $(Q)set -e; \
 328         for i in $(MAKECMDGOALS); do \
 329                 $(MAKE) -f $(srctree)/Makefile $$i; \
 330         done
 331
 332 else # !mixed-build
 333
 334 include scripts/Kbuild.include
 335
 336 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 337 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 338 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 339 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 340
 341 include scripts/subarch.include
 342
 343 # Cross compiling and selecting different set of gcc/bin-utils
 344 # ---------------------------------------------------------------------------
 345 #
 346 # When performing cross compilation for other architectures ARCH shall be set
 347 # to the target architecture. (See arch/* for the possibilities).
 348 # ARCH can be set during invocation of make:
 349 # make ARCH=ia64
 350 # Another way is to have ARCH set in the environment.
 351 # The default ARCH is the host where make is executed.
 352
 353 # CROSS_COMPILE specify the prefix used for all executables used
 354 # during compilation. Only gcc and related bin-utils executables
 355 # are prefixed with $(CROSS_COMPILE).
 356 # CROSS_COMPILE can be set on the command line
 357 # make CROSS_COMPILE=ia64-linux-
 358 # Alternatively CROSS_COMPILE can be set in the environment.
 359 # Default value for CROSS_COMPILE is not to prefix executables
 360 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 361 ARCH            ?= $(SUBARCH)
 362
 363 # Architecture as present in compile.h
 364 UTS_MACHINE     := $(ARCH)
 365 SRCARCH         := $(ARCH)
 366
 367 # Additional ARCH settings for x86
 368 ifeq ($(ARCH),i386)
 369         SRCARCH := x86
 370 endif
 371 ifeq ($(ARCH),x86_64)
 372         SRCARCH := x86
 373 endif
 374
 375 # Additional ARCH settings for sparc
 376 ifeq ($(ARCH),sparc32)
 377        SRCARCH := sparc
 378 endif
 379 ifeq ($(ARCH),sparc64)
 380        SRCARCH := sparc
 381 endif
 382
 383 # Additional ARCH settings for sh
 384 ifeq ($(ARCH),sh64)
 385        SRCARCH := sh
 386 endif
 387
 388 KCONFIG_CONFIG  ?= .config
 389 export KCONFIG_CONFIG
 390
 391 # SHELL used by kbuild
 392 CONFIG_SHELL := sh
 393
 394 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 395 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 396 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 397
 398 HOSTCC       = gcc
 399 HOSTCXX      = g++
 400 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 401                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 402                 $(HOSTCFLAGS)
 403 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 404 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 405 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 406
 407 # Make variables (CC, etc...)
 408 AS              = $(CROSS_COMPILE)as
 409 LD              = $(CROSS_COMPILE)ld
 410 CC              = $(CROSS_COMPILE)gcc
 411 CPP             = $(CC) -E
 412 AR              = $(CROSS_COMPILE)ar
 413 NM              = $(CROSS_COMPILE)nm
 414 STRIP           = $(CROSS_COMPILE)strip
 415 OBJCOPY         = $(CROSS_COMPILE)objcopy
 416 OBJDUMP         = $(CROSS_COMPILE)objdump
 417 OBJSIZE         = $(CROSS_COMPILE)size
 418 READELF         = $(CROSS_COMPILE)readelf
 419 PAHOLE          = pahole
 420 LEX             = flex
 421 YACC            = bison
 422 AWK             = awk
 423 INSTALLKERNEL  := installkernel
 424 DEPMOD          = /sbin/depmod
 425 PERL            = perl
 426 PYTHON          = python
 427 PYTHON3         = python3
 428 CHECK           = sparse
 429 BASH            = bash
 430
 431 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 432                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 433 NOSTDINC_FLAGS :=
 434 CFLAGS_MODULE   =
 435 AFLAGS_MODULE   =
 436 LDFLAGS_MODULE  =
 437 CFLAGS_KERNEL   =
 438 AFLAGS_KERNEL   =
 439 LDFLAGS_vmlinux =
 440
 441 # Use USERINCLUDE when you must reference the UAPI directories only.
 442 USERINCLUDE    := \
 443                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 444                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 445                 -I$(srctree)/include/uapi \
 446                 -I$(objtree)/include/generated/uapi \
 447                 -include $(srctree)/include/linux/kconfig.h
 448
 449 # Use LINUXINCLUDE when you must reference the include/ directory.
 450 # Needed to be compatible with the O= option
 451 LINUXINCLUDE    := \
 452                 -I$(srctree)/arch/$(SRCARCH)/include \
 453                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 454                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 455                 -I$(objtree)/include \
 456                 $(USERINCLUDE)
 457
 458 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 459 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 460                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 461                    -Werror=implicit-function-declaration -Werror=implicit-int \
 462                    -Wno-format-security \
 463                    -std=gnu89
 464 KBUILD_CPPFLAGS := -D__KERNEL__
 465 KBUILD_AFLAGS_KERNEL :=
 466 KBUILD_CFLAGS_KERNEL :=
 467 KBUILD_AFLAGS_MODULE  := -DMODULE
 468 KBUILD_CFLAGS_MODULE  := -DMODULE
 469 KBUILD_LDFLAGS_MODULE :=
 470 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 471 KBUILD_LDFLAGS :=
 472 GCC_PLUGINS_CFLAGS :=
 473 CLANG_FLAGS :=
 474
 475 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 476 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
 477 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 478 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 479
 480 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 481 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 482 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 483 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 484 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 485 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 486
 487 # Files to ignore in find ... statements
 488
 489 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 490                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 491                           -prune -o
 492 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 493                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 494
 495 # ===========================================================================
 496 # Rules shared between *config targets and build targets
 497
 498 # Basic helpers built in scripts/basic/
 499 PHONY += scripts_basic
 500 scripts_basic:
 501         $(Q)$(MAKE) $(build)=scripts/basic
 502         $(Q)rm -f .tmp_quiet_recordmcount
 503
 504 PHONY += outputmakefile
 505 # Before starting out-of-tree build, make sure the source tree is clean.
 506 # outputmakefile generates a Makefile in the output directory, if using a
 507 # separate output directory. This allows convenient use of make in the
 508 # output directory.
 509 # At the same time when output Makefile generated, generate .gitignore to
 510 # ignore whole output directory
 511 outputmakefile:
 512 ifdef building_out_of_srctree
 513         $(Q)if [ -f $(srctree)/.config -o \
 514                  -d $(srctree)/include/config -o \
 515                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 516                 echo >&2 "***"; \
 517                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 518                 echo >&2 "*** in $(abs_srctree)";\
 519                 echo >&2 "***"; \
 520                 false; \
 521         fi
 522         $(Q)ln -fsn $(srctree) source
 523         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 524         $(Q)test -e .gitignore || \
 525         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 526 endif
 527
 528 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 529 ifneq ($(CROSS_COMPILE),)
 530 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 531 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 532 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 533 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 534 endif
 535 ifneq ($(GCC_TOOLCHAIN),)
 536 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 537 endif
 538 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 539 CLANG_FLAGS     += -no-integrated-as
 540 endif
 541 CLANG_FLAGS     += -Werror=unknown-warning-option
 542 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 543 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 544 export CLANG_FLAGS
 545 endif
 546
 547 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 548 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 549 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 550 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 551 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 552
 553 ifdef config-build
 554 # ===========================================================================
 555 # *config targets only - make sure prerequisites are updated, and descend
 556 # in scripts/kconfig to make the *config target
 557
 558 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 559 # KBUILD_DEFCONFIG may point out an alternative default configuration
 560 # used for 'make defconfig'
 561 include arch/$(SRCARCH)/Makefile
 562 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 563
 564 config: outputmakefile scripts_basic FORCE
 565         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 566
 567 %config: outputmakefile scripts_basic FORCE
 568         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 569
 570 else #!config-build
 571 # ===========================================================================
 572 # Build targets only - this includes vmlinux, arch specific targets, clean
 573 # targets and others. In general all targets except *config targets.
 574
 575 # If building an external module we do not care about the all: rule
 576 # but instead _all depend on modules
 577 PHONY += all
 578 ifeq ($(KBUILD_EXTMOD),)
 579 _all: all
 580 else
 581 _all: modules
 582 endif
 583
 584 # Decide whether to build built-in, modular, or both.
 585 # Normally, just do built-in.
 586
 587 KBUILD_MODULES :=
 588 KBUILD_BUILTIN := 1
 589
 590 # If we have only "make modules", don't compile built-in objects.
 591 # When we're building modules with modversions, we need to consider
 592 # the built-in objects during the descend as well, in order to
 593 # make sure the checksums are up to date before we record them.
 594
 595 ifeq ($(MAKECMDGOALS),modules)
 596   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 597 endif
 598
 599 # If we have "make <whatever> modules", compile modules
 600 # in addition to whatever we do anyway.
 601 # Just "make" or "make all" shall build modules as well
 602
 603 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 604   KBUILD_MODULES := 1
 605 endif
 606
 607 ifeq ($(MAKECMDGOALS),)
 608   KBUILD_MODULES := 1
 609 endif
 610
 611 export KBUILD_MODULES KBUILD_BUILTIN
 612
 613 ifdef need-config
 614 include include/config/auto.conf
 615 endif
 616
 617 ifeq ($(KBUILD_EXTMOD),)
 618 # Objects we will link into vmlinux / subdirs we need to visit
 619 init-y          := init/
 620 drivers-y       := drivers/ sound/
 621 drivers-$(CONFIG_SAMPLES) += samples/
 622 net-y           := net/
 623 libs-y          := lib/
 624 core-y          := usr/
 625 virt-y          := virt/
 626 endif # KBUILD_EXTMOD
 627
 628 # The all: target is the default when no target is given on the
 629 # command line.
 630 # This allow a user to issue only 'make' to build a kernel including modules
 631 # Defaults to vmlinux, but the arch makefile usually adds further targets
 632 all: vmlinux
 633
 634 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 635         $(call cc-option,-fno-tree-loop-im) \
 636         $(call cc-disable-warning,maybe-uninitialized,)
 637 export CFLAGS_GCOV
 638
 639 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 640 ifdef CONFIG_FUNCTION_TRACER
 641   CC_FLAGS_FTRACE := -pg
 642 endif
 643
 644 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 645 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 646 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 647 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 648 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 649 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 650 export RETPOLINE_CFLAGS
 651 export RETPOLINE_VDSO_CFLAGS
 652
 653 include arch/$(SRCARCH)/Makefile
 654
 655 ifdef need-config
 656 ifdef may-sync-config
 657 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 658 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 659 # because some architectures define CROSS_COMPILE there.
 660 include include/config/auto.conf.cmd
 661
 662 $(KCONFIG_CONFIG):
 663         @echo >&2 '***'
 664         @echo >&2 '*** Configuration file "$@" not found!'
 665         @echo >&2 '***'
 666         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 667         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 668         @echo >&2 '***'
 669         @/bin/false
 670
 671 # The actual configuration files used during the build are stored in
 672 # include/generated/ and include/config/. Update them if .config is newer than
 673 # include/config/auto.conf (which mirrors .config).
 674 #
 675 # This exploits the 'multi-target pattern rule' trick.
 676 # The syncconfig should be executed only once to make all the targets.
 677 %/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
 678         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 679 else # !may-sync-config
 680 # External modules and some install targets need include/generated/autoconf.h
 681 # and include/config/auto.conf but do not care if they are up-to-date.
 682 # Use auto.conf to trigger the test
 683 PHONY += include/config/auto.conf
 684
 685 include/config/auto.conf:
 686         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 687         echo >&2;                                                       \
 688         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 689         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 690         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 691         echo >&2 ;                                                      \
 692         /bin/false)
 693
 694 endif # may-sync-config
 695 endif # need-config
 696
 697 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 698 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 699 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 700 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 701 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 702
 703 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 704 KBUILD_CFLAGS += -O2
 705 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 706 KBUILD_CFLAGS += -O3
 707 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 708 KBUILD_CFLAGS += -Os
 709 endif
 710
 711 # Tell gcc to never replace conditional load with a non-conditional one
 712 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 713 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 714
 715 include scripts/Makefile.kcov
 716 include scripts/Makefile.gcc-plugins
 717
 718 ifdef CONFIG_READABLE_ASM
 719 # Disable optimizations that make assembler listings hard to read.
 720 # reorder blocks reorders the control in the function
 721 # ipa clone creates specialized cloned functions
 722 # partial inlining inlines only parts of functions
 723 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 724                  $(call cc-option,-fno-ipa-cp-clone,) \
 725                  $(call cc-option,-fno-partial-inlining)
 726 endif
 727
 728 ifneq ($(CONFIG_FRAME_WARN),0)
 729 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 730 endif
 731
 732 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 733 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 734 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 735
 736 KBUILD_CFLAGS += $(stackp-flags-y)
 737
 738 ifdef CONFIG_CC_IS_CLANG
 739 KBUILD_CPPFLAGS += -Qunused-arguments
 740 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 741 KBUILD_CFLAGS += -Wno-gnu
 742 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 743 KBUILD_CFLAGS += -Wno-tautological-compare
 744 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 745 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 746 # See modpost pattern 2
 747 KBUILD_CFLAGS += -mno-global-merge
 748 else
 749
 750 # These warnings generated too much noise in a regular build.
 751 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 752 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 753
 754 # Warn about unmarked fall-throughs in switch statement.
 755 # Disabled for clang while comment to attribute conversion happens and
 756 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 757 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 758 endif
 759
 760 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 761 ifdef CONFIG_FRAME_POINTER
 762 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 763 else
 764 # Some targets (ARM with Thumb2, for example), can't be built with frame
 765 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 766 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 767 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 768 # -fomit-frame-pointer with FUNCTION_TRACER.
 769 ifndef CONFIG_FUNCTION_TRACER
 770 KBUILD_CFLAGS   += -fomit-frame-pointer
 771 endif
 772 endif
 773
 774 # Initialize all stack variables with a pattern, if desired.
 775 ifdef CONFIG_INIT_STACK_ALL
 776 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 777 endif
 778
 779 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 780
 781 ifdef CONFIG_DEBUG_INFO
 782 ifdef CONFIG_DEBUG_INFO_SPLIT
 783 DEBUG_CFLAGS    += -gsplit-dwarf
 784 else
 785 DEBUG_CFLAGS    += -g
 786 endif
 787 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 788 endif
 789 ifdef CONFIG_DEBUG_INFO_DWARF4
 790 DEBUG_CFLAGS    += -gdwarf-4
 791 endif
 792
 793 ifdef CONFIG_DEBUG_INFO_REDUCED
 794 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 795                    $(call cc-option,-fno-var-tracking)
 796 endif
 797
 798 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 799 export DEBUG_CFLAGS
 800
 801 ifdef CONFIG_FUNCTION_TRACER
 802 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 803   # gcc 5 supports generating the mcount tables directly
 804   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 805     CC_FLAGS_FTRACE     += -mrecord-mcount
 806     export CC_USING_RECORD_MCOUNT := 1
 807   endif
 808   ifdef CONFIG_HAVE_NOP_MCOUNT
 809     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 810       CC_FLAGS_FTRACE   += -mnop-mcount
 811       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 812     endif
 813   endif
 814 endif
 815 ifdef CONFIG_HAVE_FENTRY
 816   ifeq ($(call cc-option-yn, -mfentry),y)
 817     CC_FLAGS_FTRACE     += -mfentry
 818     CC_FLAGS_USING      += -DCC_USING_FENTRY
 819   endif
 820 endif
 821 export CC_FLAGS_FTRACE
 822 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 823 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 824 ifdef CONFIG_DYNAMIC_FTRACE
 825         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 826                 BUILD_C_RECORDMCOUNT := y
 827                 export BUILD_C_RECORDMCOUNT
 828         endif
 829 endif
 830 endif
 831
 832 # We trigger additional mismatches with less inlining
 833 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 834 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 835 endif
 836
 837 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 838 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 839 LDFLAGS_vmlinux += --gc-sections
 840 endif
 841
 842 ifdef CONFIG_LIVEPATCH
 843 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 844 endif
 845
 846 # arch Makefile may override CC so keep this after arch Makefile is included
 847 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 848
 849 # warn about C99 declaration after statement
 850 KBUILD_CFLAGS += -Wdeclaration-after-statement
 851
 852 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 853 KBUILD_CFLAGS += -Wvla
 854
 855 # disable pointer signed / unsigned warnings in gcc 4.0
 856 KBUILD_CFLAGS += -Wno-pointer-sign
 857
 858 # disable stringop warnings in gcc 8+
 859 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 860
 861 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 862 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 863 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 864 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 865
 866 # Another good warning that we'll want to enable eventually
 867 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 868
 869 # Enabled with W=2, disabled by default as noisy
 870 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 871
 872 # disable invalid "can't wrap" optimizations for signed / pointers
 873 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 874
 875 # clang sets -fmerge-all-constants by default as optimization, but this
 876 # is non-conforming behavior for C and in fact breaks the kernel, so we
 877 # need to disable it here generally.
 878 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 879
 880 # for gcc -fno-merge-all-constants disables everything, but it is fine
 881 # to have actual conforming behavior enabled.
 882 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 883
 884 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 885 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 886
 887 # conserve stack if available
 888 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 889
 890 # Prohibit date/time macros, which would make the build non-deterministic
 891 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 892
 893 # enforce correct pointer usage
 894 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 895
 896 # Require designated initializers for all marked structures
 897 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 898
 899 # change __FILE__ to the relative path from the srctree
 900 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 901
 902 # ensure -fcf-protection is disabled when using retpoline as it is
 903 # incompatible with -mindirect-branch=thunk-extern
 904 ifdef CONFIG_RETPOLINE
 905 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 906 endif
 907
 908 include scripts/Makefile.kasan
 909 include scripts/Makefile.extrawarn
 910 include scripts/Makefile.ubsan
 911
 912 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 913 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 914 KBUILD_AFLAGS   += $(KAFLAGS)
 915 KBUILD_CFLAGS   += $(KCFLAGS)
 916
 917 KBUILD_LDFLAGS_MODULE += --build-id
 918 LDFLAGS_vmlinux += --build-id
 919
 920 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 921 LDFLAGS_vmlinux += $(call ld-option, -X,)
 922 endif
 923
 924 ifeq ($(CONFIG_RELR),y)
 925 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
 926 endif
 927
 928 # make the checker run with the right architecture
 929 CHECKFLAGS += --arch=$(ARCH)
 930
 931 # insure the checker run with the right endianness
 932 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 933
 934 # the checker needs the correct machine size
 935 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 936
 937 # Default kernel image to build when no specific target is given.
 938 # KBUILD_IMAGE may be overruled on the command line or
 939 # set in the environment
 940 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 941 # this default value
 942 export KBUILD_IMAGE ?= vmlinux
 943
 944 #
 945 # INSTALL_PATH specifies where to place the updated kernel and system map
 946 # images. Default is /boot, but you can set it to other values
 947 export  INSTALL_PATH ?= /boot
 948
 949 #
 950 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 951 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 952 # an argument if needed. Otherwise it defaults to the kernel install path
 953 #
 954 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 955
 956 #
 957 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 958 # relocations required by build roots.  This is not defined in the
 959 # makefile but the argument can be passed to make if needed.
 960 #
 961
 962 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 963 export MODLIB
 964
 965 #
 966 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 967 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 968 # the default option --strip-debug will be used.  Otherwise,
 969 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 970
 971 ifdef INSTALL_MOD_STRIP
 972 ifeq ($(INSTALL_MOD_STRIP),1)
 973 mod_strip_cmd = $(STRIP) --strip-debug
 974 else
 975 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 976 endif # INSTALL_MOD_STRIP=1
 977 else
 978 mod_strip_cmd = true
 979 endif # INSTALL_MOD_STRIP
 980 export mod_strip_cmd
 981
 982 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 983 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 984 # or CONFIG_MODULE_COMPRESS_XZ.
 985
 986 mod_compress_cmd = true
 987 ifdef CONFIG_MODULE_COMPRESS
 988   ifdef CONFIG_MODULE_COMPRESS_GZIP
 989     mod_compress_cmd = gzip -n -f
 990   endif # CONFIG_MODULE_COMPRESS_GZIP
 991   ifdef CONFIG_MODULE_COMPRESS_XZ
 992     mod_compress_cmd = xz -f
 993   endif # CONFIG_MODULE_COMPRESS_XZ
 994 endif # CONFIG_MODULE_COMPRESS
 995 export mod_compress_cmd
 996
 997 ifdef CONFIG_MODULE_SIG_ALL
 998 $(eval $(call config_filename,MODULE_SIG_KEY))
 999
1000 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1001 else
1002 mod_sign_cmd = true
1003 endif
1004 export mod_sign_cmd
1005
1006 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1007
1008 ifdef CONFIG_STACK_VALIDATION
1009   has_libelf := $(call try-run,\
1010                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1011   ifeq ($(has_libelf),1)
1012     objtool_target := tools/objtool FORCE
1013   else
1014     SKIP_STACK_VALIDATION := 1
1015     export SKIP_STACK_VALIDATION
1016   endif
1017 endif
1018
1019 PHONY += prepare0
1020
1021 export MODORDER := $(extmod-prefix)modules.order
1022 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1023
1024 ifeq ($(KBUILD_EXTMOD),)
1025 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1026
1027 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1028                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1029                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1030
1031 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1032                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1033                         $(drivers-) $(net-) $(libs-) $(virt-))))
1034
1035 build-dirs      := $(vmlinux-dirs)
1036 clean-dirs      := $(vmlinux-alldirs)
1037
1038 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1039 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1040 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1041 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1042 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1043 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1044 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1045
1046 # Externally visible symbols (used by link-vmlinux.sh)
1047 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1048                               $(drivers-y) $(net-y) $(virt-y)
1049 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1050 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1051 export LDFLAGS_vmlinux
1052 # used by scripts/Makefile.package
1053 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1054
1055 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1056
1057 # Recurse until adjust_autoksyms.sh is satisfied
1058 PHONY += autoksyms_recursive
1059 ifdef CONFIG_TRIM_UNUSED_KSYMS
1060 autoksyms_recursive: descend modules.order
1061         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1062           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1063 endif
1064
1065 # For the kernel to actually contain only the needed exported symbols,
1066 # we have to build modules as well to determine what those symbols are.
1067 # (this can be evaluated only once include/config/auto.conf has been included)
1068 ifdef CONFIG_TRIM_UNUSED_KSYMS
1069   KBUILD_MODULES := 1
1070 endif
1071
1072 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1073
1074 $(autoksyms_h):
1075         $(Q)mkdir -p $(dir $@)
1076         $(Q)touch $@
1077
1078 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1079
1080 # Final link of vmlinux with optional arch pass after final link
1081 cmd_link-vmlinux =                                                 \
1082         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1083         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1084
1085 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1086         +$(call if_changed,link-vmlinux)
1087
1088 targets := vmlinux
1089
1090 # The actual objects are generated when descending,
1091 # make sure no implicit rule kicks in
1092 $(sort $(vmlinux-deps)): descend ;
1093
1094 filechk_kernel.release = \
1095         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1096
1097 # Store (new) KERNELRELEASE string in include/config/kernel.release
1098 include/config/kernel.release: FORCE
1099         $(call filechk,kernel.release)
1100
1101 # Additional helpers built in scripts/
1102 # Carefully list dependencies so we do not try to build scripts twice
1103 # in parallel
1104 PHONY += scripts
1105 scripts: scripts_basic scripts_dtc
1106         $(Q)$(MAKE) $(build)=$(@)
1107
1108 # Things we need to do before we recursively start building the kernel
1109 # or the modules are listed in "prepare".
1110 # A multi level approach is used. prepareN is processed before prepareN-1.
1111 # archprepare is used in arch Makefiles and when processed asm symlink,
1112 # version.h and scripts_basic is processed / created.
1113
1114 PHONY += prepare archprepare
1115
1116 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1117         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1118
1119 prepare0: archprepare
1120         $(Q)$(MAKE) $(build)=scripts/mod
1121         $(Q)$(MAKE) $(build)=.
1122
1123 # All the preparing..
1124 prepare: prepare0 prepare-objtool
1125
1126 # Support for using generic headers in asm-generic
1127 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1128
1129 PHONY += asm-generic uapi-asm-generic
1130 asm-generic: uapi-asm-generic
1131         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1132         generic=include/asm-generic
1133 uapi-asm-generic:
1134         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1135         generic=include/uapi/asm-generic
1136
1137 PHONY += prepare-objtool
1138 prepare-objtool: $(objtool_target)
1139 ifeq ($(SKIP_STACK_VALIDATION),1)
1140 ifdef CONFIG_UNWINDER_ORC
1141         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1142         @false
1143 else
1144         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1145 endif
1146 endif
1147
1148 # Generate some files
1149 # ---------------------------------------------------------------------------
1150
1151 # KERNELRELEASE can change from a few different places, meaning version.h
1152 # needs to be updated, so this check is forced on all builds
1153
1154 uts_len := 64
1155 define filechk_utsrelease.h
1156         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1157           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1158           exit 1;                                                         \
1159         fi;                                                               \
1160         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1161 endef
1162
1163 define filechk_version.h
1164         echo \#define LINUX_VERSION_CODE $(shell                         \
1165         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1166         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1167 endef
1168
1169 $(version_h): FORCE
1170         $(call filechk,version.h)
1171         $(Q)rm -f $(old_version_h)
1172
1173 include/generated/utsrelease.h: include/config/kernel.release FORCE
1174         $(call filechk,utsrelease.h)
1175
1176 PHONY += headerdep
1177 headerdep:
1178         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1179         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1180
1181 # ---------------------------------------------------------------------------
1182 # Kernel headers
1183
1184 #Default location for installed headers
1185 export INSTALL_HDR_PATH = $(objtree)/usr
1186
1187 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1188       cmd_headers_install = \
1189         mkdir -p $(INSTALL_HDR_PATH); \
1190         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1191         usr/include $(INSTALL_HDR_PATH)
1192
1193 PHONY += headers_install
1194 headers_install: headers
1195         $(call cmd,headers_install)
1196
1197 PHONY += archheaders archscripts
1198
1199 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1200
1201 PHONY += headers
1202 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1203         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1204           $(error Headers not exportable for the $(SRCARCH) architecture))
1205         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1206         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1207
1208 # Deprecated. It is no-op now.
1209 PHONY += headers_check
1210 headers_check:
1211         @:
1212
1213 ifdef CONFIG_HEADERS_INSTALL
1214 prepare: headers
1215 endif
1216
1217 PHONY += scripts_unifdef
1218 scripts_unifdef: scripts_basic
1219         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1220
1221 # ---------------------------------------------------------------------------
1222 # Kernel selftest
1223
1224 PHONY += kselftest
1225 kselftest:
1226         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1227
1228 kselftest-%: FORCE
1229         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1230
1231 PHONY += kselftest-merge
1232 kselftest-merge:
1233         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1234         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1235                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1236         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1237
1238 # ---------------------------------------------------------------------------
1239 # Devicetree files
1240
1241 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1242 dtstree := arch/$(SRCARCH)/boot/dts
1243 endif
1244
1245 ifneq ($(dtstree),)
1246
1247 %.dtb: include/config/kernel.release scripts_dtc
1248         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1249
1250 PHONY += dtbs dtbs_install dtbs_check
1251 dtbs: include/config/kernel.release scripts_dtc
1252         $(Q)$(MAKE) $(build)=$(dtstree)
1253
1254 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1255 dtbs: dt_binding_check
1256 endif
1257
1258 dtbs_check: export CHECK_DTBS=1
1259 dtbs_check: dtbs
1260
1261 dtbs_install:
1262         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1263
1264 ifdef CONFIG_OF_EARLY_FLATTREE
1265 all: dtbs
1266 endif
1267
1268 endif
1269
1270 PHONY += scripts_dtc
1271 scripts_dtc: scripts_basic
1272         $(Q)$(MAKE) $(build)=scripts/dtc
1273
1274 PHONY += dt_binding_check
1275 dt_binding_check: scripts_dtc
1276         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1277
1278 # ---------------------------------------------------------------------------
1279 # Modules
1280
1281 ifdef CONFIG_MODULES
1282
1283 # By default, build modules as well
1284
1285 all: modules
1286
1287 # Build modules
1288 #
1289 # A module can be listed more than once in obj-m resulting in
1290 # duplicate lines in modules.order files.  Those are removed
1291 # using awk while concatenating to the final file.
1292
1293 PHONY += modules
1294 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1295         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1296         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1297
1298 modules.order: descend
1299         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1300
1301 # Target to prepare building external modules
1302 PHONY += modules_prepare
1303 modules_prepare: prepare
1304
1305 # Target to install modules
1306 PHONY += modules_install
1307 modules_install: _modinst_ _modinst_post
1308
1309 PHONY += _modinst_
1310 _modinst_:
1311         @rm -rf $(MODLIB)/kernel
1312         @rm -f $(MODLIB)/source
1313         @mkdir -p $(MODLIB)/kernel
1314         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1315         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1316                 rm -f $(MODLIB)/build ; \
1317                 ln -s $(CURDIR) $(MODLIB)/build ; \
1318         fi
1319         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1320         @cp -f modules.builtin $(MODLIB)/
1321         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1322         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1323
1324 # This depmod is only for convenience to give the initial
1325 # boot a modules.dep even before / is mounted read-write.  However the
1326 # boot script depmod is the master version.
1327 PHONY += _modinst_post
1328 _modinst_post: _modinst_
1329         $(call cmd,depmod)
1330
1331 ifeq ($(CONFIG_MODULE_SIG), y)
1332 PHONY += modules_sign
1333 modules_sign:
1334         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1335 endif
1336
1337 else # CONFIG_MODULES
1338
1339 # Modules not configured
1340 # ---------------------------------------------------------------------------
1341
1342 PHONY += modules modules_install
1343 modules modules_install:
1344         @echo >&2
1345         @echo >&2 "The present kernel configuration has modules disabled."
1346         @echo >&2 "Type 'make config' and enable loadable module support."
1347         @echo >&2 "Then build a kernel with module support enabled."
1348         @echo >&2
1349         @exit 1
1350
1351 endif # CONFIG_MODULES
1352
1353 ###
1354 # Cleaning is done on three levels.
1355 # make clean     Delete most generated files
1356 #                Leave enough to build external modules
1357 # make mrproper  Delete the current configuration, and all generated files
1358 # make distclean Remove editor backup files, patch leftover files and the like
1359
1360 # Directories & files removed with 'make clean'
1361 CLEAN_DIRS  += include/ksym
1362 CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
1363
1364 # Directories & files removed with 'make mrproper'
1365 MRPROPER_DIRS  += include/config include/generated          \
1366                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1367                   debian/ snap/ tar-install/
1368 MRPROPER_FILES += .config .config.old .version \
1369                   Module.symvers \
1370                   signing_key.pem signing_key.priv signing_key.x509     \
1371                   x509.genkey extra_certificates signing_key.x509.keyid \
1372                   signing_key.x509.signer vmlinux-gdb.py \
1373                   *.spec
1374
1375 # Directories & files removed with 'make distclean'
1376 DISTCLEAN_DIRS  +=
1377 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1378
1379 # clean - Delete most, but leave enough to build external modules
1380 #
1381 clean: rm-dirs  := $(CLEAN_DIRS)
1382 clean: rm-files := $(CLEAN_FILES)
1383
1384 PHONY += archclean vmlinuxclean
1385
1386 vmlinuxclean:
1387         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1388         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1389
1390 clean: archclean vmlinuxclean
1391
1392 # mrproper - Delete all generated files, including .config
1393 #
1394 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1395 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1396 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1397
1398 PHONY += $(mrproper-dirs) mrproper
1399 $(mrproper-dirs):
1400         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1401
1402 mrproper: clean $(mrproper-dirs)
1403         $(call cmd,rmdirs)
1404         $(call cmd,rmfiles)
1405
1406 # distclean
1407 #
1408 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1409 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1410
1411 PHONY += distclean
1412
1413 distclean: mrproper
1414         $(call cmd,rmdirs)
1415         $(call cmd,rmfiles)
1416         @find $(srctree) $(RCS_FIND_IGNORE) \
1417                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1418                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1419                 -o -name 'core' \) \
1420                 -type f -print | xargs rm -f
1421
1422
1423 # Packaging of the kernel to various formats
1424 # ---------------------------------------------------------------------------
1425
1426 %src-pkg: FORCE
1427         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1428 %pkg: include/config/kernel.release FORCE
1429         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1430
1431 # Brief documentation of the typical targets used
1432 # ---------------------------------------------------------------------------
1433
1434 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1435 boards := $(sort $(notdir $(boards)))
1436 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1437 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1438
1439 PHONY += help
1440 help:
1441         @echo  'Cleaning targets:'
1442         @echo  '  clean           - Remove most generated files but keep the config and'
1443         @echo  '                    enough build support to build external modules'
1444         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1445         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1446         @echo  ''
1447         @echo  'Configuration targets:'
1448         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1449         @echo  ''
1450         @echo  'Other generic targets:'
1451         @echo  '  all             - Build all targets marked with [*]'
1452         @echo  '* vmlinux         - Build the bare kernel'
1453         @echo  '* modules         - Build all modules'
1454         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1455         @echo  '  dir/            - Build all files in dir and below'
1456         @echo  '  dir/file.[ois]  - Build specified target only'
1457         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1458         @echo  '                    (requires compiler support for LLVM assembly generation)'
1459         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1460         @echo  '                    (requires a recent binutils and recent build (System.map))'
1461         @echo  '  dir/file.ko     - Build module including final link'
1462         @echo  '  modules_prepare - Set up for building external modules'
1463         @echo  '  tags/TAGS       - Generate tags file for editors'
1464         @echo  '  cscope          - Generate cscope index'
1465         @echo  '  gtags           - Generate GNU GLOBAL index'
1466         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1467         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1468         @echo  '  image_name      - Output the image name (use with make -s)'
1469         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1470          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1471          echo  ''
1472         @echo  'Static analysers:'
1473         @echo  '  checkstack      - Generate a list of stack hogs'
1474         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1475         @echo  '  versioncheck    - Sanity check on version.h usage'
1476         @echo  '  includecheck    - Check for duplicate included header files'
1477         @echo  '  export_report   - List the usages of all exported symbols'
1478         @echo  '  headerdep       - Detect inclusion cycles in headers'
1479         @echo  '  coccicheck      - Check with Coccinelle'
1480         @echo  ''
1481         @echo  'Tools:'
1482         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1483         @echo  ''
1484         @echo  'Kernel selftest:'
1485         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1486         @echo  '                    Build, install, and boot kernel before'
1487         @echo  '                    running kselftest on it'
1488         @echo  '  kselftest-clean - Remove all generated kselftest files'
1489         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1490         @echo  '                    .config.'
1491         @echo  ''
1492         @$(if $(dtstree), \
1493                 echo 'Devicetree:'; \
1494                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1495                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1496                 echo '  dt_binding_check - Validate device tree binding documents'; \
1497                 echo '  dtbs_check       - Validate device tree source files';\
1498                 echo '')
1499
1500         @echo 'Userspace tools targets:'
1501         @echo '  use "make tools/help"'
1502         @echo '  or  "cd tools; make help"'
1503         @echo  ''
1504         @echo  'Kernel packaging:'
1505         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1506         @echo  ''
1507         @echo  'Documentation targets:'
1508         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1509         @echo  ''
1510         @echo  'Architecture specific targets ($(SRCARCH)):'
1511         @$(if $(archhelp),$(archhelp),\
1512                 echo '  No architecture specific help defined for $(SRCARCH)')
1513         @echo  ''
1514         @$(if $(boards), \
1515                 $(foreach b, $(boards), \
1516                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1517                 echo '')
1518         @$(if $(board-dirs), \
1519                 $(foreach b, $(board-dirs), \
1520                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1521                 printf "  %-16s - Show all of the above\\n" help-boards; \
1522                 echo '')
1523
1524         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1525         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1526         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1527         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1528         @echo  '                       (sparse by default)'
1529         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1530         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1531         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1532         @echo  '                1: warnings which may be relevant and do not occur too often'
1533         @echo  '                2: warnings which occur quite often but may still be relevant'
1534         @echo  '                3: more obscure warnings, can most likely be ignored'
1535         @echo  '                Multiple levels can be combined with W=12 or W=123'
1536         @echo  ''
1537         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1538         @echo  'For further info see the ./README file'
1539
1540
1541 help-board-dirs := $(addprefix help-,$(board-dirs))
1542
1543 help-boards: $(help-board-dirs)
1544
1545 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1546
1547 $(help-board-dirs): help-%:
1548         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1549         @$(if $(boards-per-dir), \
1550                 $(foreach b, $(boards-per-dir), \
1551                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1552                 echo '')
1553
1554
1555 # Documentation targets
1556 # ---------------------------------------------------------------------------
1557 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1558                linkcheckdocs dochelp refcheckdocs
1559 PHONY += $(DOC_TARGETS)
1560 $(DOC_TARGETS):
1561         $(Q)$(MAKE) $(build)=Documentation $@
1562
1563 # Misc
1564 # ---------------------------------------------------------------------------
1565
1566 PHONY += scripts_gdb
1567 scripts_gdb: prepare0
1568         $(Q)$(MAKE) $(build)=scripts/gdb
1569         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1570
1571 ifdef CONFIG_GDB_SCRIPTS
1572 all: scripts_gdb
1573 endif
1574
1575 else # KBUILD_EXTMOD
1576
1577 ###
1578 # External module support.
1579 # When building external modules the kernel used as basis is considered
1580 # read-only, and no consistency checks are made and the make
1581 # system is not used on the basis kernel. If updates are required
1582 # in the basis kernel ordinary make commands (without M=...) must
1583 # be used.
1584 #
1585 # The following are the only valid targets when building external
1586 # modules.
1587 # make M=dir clean     Delete all automatically generated files
1588 # make M=dir modules   Make all modules in specified dir
1589 # make M=dir           Same as 'make M=dir modules'
1590 # make M=dir modules_install
1591 #                      Install the modules built in the module directory
1592 #                      Assumes install directory is already created
1593
1594 # We are always building modules
1595 KBUILD_MODULES := 1
1596
1597 PHONY += $(objtree)/Module.symvers
1598 $(objtree)/Module.symvers:
1599         @test -e $(objtree)/Module.symvers || ( \
1600         echo; \
1601         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1602         echo "           is missing; modules will have no dependencies and modversions."; \
1603         echo )
1604
1605 build-dirs := $(KBUILD_EXTMOD)
1606 PHONY += modules
1607 modules: descend $(objtree)/Module.symvers
1608         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1609
1610 PHONY += modules_install
1611 modules_install: _emodinst_ _emodinst_post
1612
1613 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1614 PHONY += _emodinst_
1615 _emodinst_:
1616         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1617         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1618
1619 PHONY += _emodinst_post
1620 _emodinst_post: _emodinst_
1621         $(call cmd,depmod)
1622
1623 clean-dirs := $(KBUILD_EXTMOD)
1624 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1625
1626 PHONY += /
1627 /:
1628         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1629
1630 PHONY += help
1631 help:
1632         @echo  '  Building external modules.'
1633         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1634         @echo  ''
1635         @echo  '  modules         - default target, build the module(s)'
1636         @echo  '  modules_install - install the module'
1637         @echo  '  clean           - remove generated files in module directory only'
1638         @echo  ''
1639
1640 PHONY += prepare
1641 endif # KBUILD_EXTMOD
1642
1643 # Single targets
1644 # ---------------------------------------------------------------------------
1645 # To build individual files in subdirectories, you can do like this:
1646 #
1647 #   make foo/bar/baz.s
1648 #
1649 # The supported suffixes for single-target are listed in 'single-targets'
1650 #
1651 # To build only under specific subdirectories, you can do like this:
1652 #
1653 #   make foo/bar/baz/
1654
1655 ifdef single-build
1656
1657 # .ko is special because modpost is needed
1658 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1659 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1660
1661 $(single-ko): single_modpost
1662         @:
1663 $(single-no-ko): descend
1664         @:
1665
1666 ifeq ($(KBUILD_EXTMOD),)
1667 # For the single build of in-tree modules, use a temporary file to avoid
1668 # the situation of modules_install installing an invalid modules.order.
1669 MODORDER := .modules.tmp
1670 endif
1671
1672 PHONY += single_modpost
1673 single_modpost: $(single-no-ko)
1674         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1675         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1676
1677 KBUILD_MODULES := 1
1678
1679 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1680
1681 # trim unrelated directories
1682 build-dirs := $(foreach d, $(build-dirs), \
1683                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1684
1685 endif
1686
1687 # Handle descending into subdirectories listed in $(build-dirs)
1688 # Preset locale variables to speed up the build process. Limit locale
1689 # tweaks to this spot to avoid wrong language settings when running
1690 # make menuconfig etc.
1691 # Error messages still appears in the original language
1692 PHONY += descend $(build-dirs)
1693 descend: $(build-dirs)
1694 $(build-dirs): prepare
1695         $(Q)$(MAKE) $(build)=$@ \
1696         single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1697         need-builtin=1 need-modorder=1
1698
1699 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1700 PHONY += $(clean-dirs) clean
1701 $(clean-dirs):
1702         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1703
1704 clean: $(clean-dirs)
1705         $(call cmd,rmdirs)
1706         $(call cmd,rmfiles)
1707         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1708                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1709                 -o -name '*.ko.*' \
1710                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1711                 -o -name '*.dwo' -o -name '*.lst' \
1712                 -o -name '*.su' -o -name '*.mod' \
1713                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1714                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1715                 -o -name '*.asn1.[ch]' \
1716                 -o -name '*.symtypes' -o -name 'modules.order' \
1717                 -o -name '.tmp_*.o.*' \
1718                 -o -name '*.c.[012]*.*' \
1719                 -o -name '*.ll' \
1720                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1721
1722 # Generate tags for editors
1723 # ---------------------------------------------------------------------------
1724 quiet_cmd_tags = GEN     $@
1725       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1726
1727 tags TAGS cscope gtags: FORCE
1728         $(call cmd,tags)
1729
1730 # Script to generate missing namespace dependencies
1731 # ---------------------------------------------------------------------------
1732
1733 PHONY += nsdeps
1734 nsdeps: export KBUILD_NSDEPS=1
1735 nsdeps: modules
1736         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1737
1738 # Scripts to check various things for consistency
1739 # ---------------------------------------------------------------------------
1740
1741 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1742
1743 includecheck:
1744         find $(srctree)/* $(RCS_FIND_IGNORE) \
1745                 -name '*.[hcS]' -type f -print | sort \
1746                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1747
1748 versioncheck:
1749         find $(srctree)/* $(RCS_FIND_IGNORE) \
1750                 -name '*.[hcS]' -type f -print | sort \
1751                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1752
1753 coccicheck:
1754         $(Q)$(BASH) $(srctree)/scripts/$@
1755
1756 namespacecheck:
1757         $(PERL) $(srctree)/scripts/namespace.pl
1758
1759 export_report:
1760         $(PERL) $(srctree)/scripts/export_report.pl
1761
1762 PHONY += checkstack kernelrelease kernelversion image_name
1763
1764 # UML needs a little special treatment here.  It wants to use the host
1765 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1766 # else wants $(ARCH), including people doing cross-builds, which means
1767 # that $(SUBARCH) doesn't work here.
1768 ifeq ($(ARCH), um)
1769 CHECKSTACK_ARCH := $(SUBARCH)
1770 else
1771 CHECKSTACK_ARCH := $(ARCH)
1772 endif
1773 checkstack:
1774         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1775         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1776
1777 kernelrelease:
1778         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1779
1780 kernelversion:
1781         @echo $(KERNELVERSION)
1782
1783 image_name:
1784         @echo $(KBUILD_IMAGE)
1785
1786 # Clear a bunch of variables before executing the submake
1787
1788 ifeq ($(quiet),silent_)
1789 tools_silent=s
1790 endif
1791
1792 tools/: FORCE
1793         $(Q)mkdir -p $(objtree)/tools
1794         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1795
1796 tools/%: FORCE
1797         $(Q)mkdir -p $(objtree)/tools
1798         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1799
1800 # FIXME Should go into a make.lib or something
1801 # ===========================================================================
1802
1803 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1804       cmd_rmdirs = rm -rf $(rm-dirs)
1805
1806 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1807       cmd_rmfiles = rm -f $(rm-files)
1808
1809 # Run depmod only if we have System.map and depmod is executable
1810 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1811       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1812                    $(KERNELRELEASE)
1813
1814 # read saved command lines for existing targets
1815 existing-targets := $(wildcard $(sort $(targets)))
1816
1817 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1818
1819 endif # config-build
1820 endif # mixed-build
1821 endif # need-sub-make
1822
1823 PHONY += FORCE
1824 FORCE:
1825
1826 # Declare the contents of the PHONY variable as phony.  We keep that
1827 # information in a variable so we can use it in if_changed and friends.
1828 .PHONY: $(PHONY)