Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 20
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc2
   6 NAME = "People's Front"
   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 # Do not use make's built-in rules and variables
  19 # (this increases performance and avoids hard-to-debug behaviour)
  20 MAKEFLAGS += -rR
  21
  22 # Avoid funny character set dependencies
  23 unexport LC_ALL
  24 LC_COLLATE=C
  25 LC_NUMERIC=C
  26 export LC_COLLATE LC_NUMERIC
  27
  28 # Avoid interference with shell env settings
  29 unexport GREP_OPTIONS
  30
  31 # We are using a recursive build, so we need to do a little thinking
  32 # to get the ordering right.
  33 #
  34 # Most importantly: sub-Makefiles should only ever modify files in
  35 # their own directory. If in some directory we have a dependency on
  36 # a file in another dir (which doesn't happen often, but it's often
  37 # unavoidable when linking the built-in.a targets which finally
  38 # turn into vmlinux), we will call a sub make in that other dir, and
  39 # after that we are sure that everything which is in that other dir
  40 # is now up to date.
  41 #
  42 # The only cases where we need to modify files which have global
  43 # effects are thus separated out and done before the recursive
  44 # descending is started. They are now explicitly listed as the
  45 # prepare rule.
  46
  47 # Beautify output
  48 # ---------------------------------------------------------------------------
  49 #
  50 # Normally, we echo the whole command before executing it. By making
  51 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  52 # $(quiet) to choose other forms of output instead, e.g.
  53 #
  54 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  55 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  56 #
  57 # If $(quiet) is empty, the whole command will be printed.
  58 # If it is set to "quiet_", only the short version will be printed.
  59 # If it is set to "silent_", nothing will be printed at all, since
  60 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  61 #
  62 # A simple variant is to prefix commands with $(Q) - that's useful
  63 # for commands that shall be hidden in non-verbose mode.
  64 #
  65 #       $(Q)ln $@ :<
  66 #
  67 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  68 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  69 #
  70 # To put more focus on warnings, be less verbose as default
  71 # Use 'make V=1' to see the full commands
  72
  73 ifeq ("$(origin V)", "command line")
  74   KBUILD_VERBOSE = $(V)
  75 endif
  76 ifndef KBUILD_VERBOSE
  77   KBUILD_VERBOSE = 0
  78 endif
  79
  80 ifeq ($(KBUILD_VERBOSE),1)
  81   quiet =
  82   Q =
  83 else
  84   quiet=quiet_
  85   Q = @
  86 endif
  87
  88 # If the user is running make -s (silent mode), suppress echoing of
  89 # commands
  90
  91 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  92   quiet=silent_
  93   tools_silent=s
  94 endif
  95
  96 export quiet Q KBUILD_VERBOSE
  97
  98 # kbuild supports saving output files in a separate directory.
  99 # To locate output files in a separate directory two syntaxes are supported.
 100 # In both cases the working directory must be the root of the kernel src.
 101 # 1) O=
 102 # Use "make O=dir/to/store/output/files/"
 103 #
 104 # 2) Set KBUILD_OUTPUT
 105 # Set the environment variable KBUILD_OUTPUT to point to the directory
 106 # where the output files shall be placed.
 107 # export KBUILD_OUTPUT=dir/to/store/output/files/
 108 # make
 109 #
 110 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 111 # variable.
 112
 113 # KBUILD_SRC is not intended to be used by the regular user (for now),
 114 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 115 ifeq ($(KBUILD_SRC),)
 116
 117 # OK, Make called in directory where kernel src resides
 118 # Do we want to locate output files in a separate directory?
 119 ifeq ("$(origin O)", "command line")
 120   KBUILD_OUTPUT := $(O)
 121 endif
 122
 123 # Cancel implicit rules on top Makefile
 124 $(CURDIR)/Makefile Makefile: ;
 125
 126 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 127   $(error main directory cannot contain spaces nor colons)
 128 endif
 129
 130 ifneq ($(KBUILD_OUTPUT),)
 131 # check that the output directory actually exists
 132 saved-output := $(KBUILD_OUTPUT)
 133 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 134                                                                 && pwd)
 135 $(if $(KBUILD_OUTPUT),, \
 136      $(error failed to create output directory "$(saved-output)"))
 137
 138 # Look for make include files relative to root of kernel src
 139 #
 140 # This does not become effective immediately because MAKEFLAGS is re-parsed
 141 # once after the Makefile is read.  It is OK since we are going to invoke
 142 # 'sub-make' below.
 143 MAKEFLAGS += --include-dir=$(CURDIR)
 144
 145 PHONY += $(MAKECMDGOALS) sub-make
 146
 147 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 148         @:
 149
 150 # Invoke a second make in the output directory, passing relevant variables
 151 sub-make:
 152         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 153         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 154
 155 # Leave processing to above invocation of make
 156 skip-makefile := 1
 157 endif # ifneq ($(KBUILD_OUTPUT),)
 158 endif # ifeq ($(KBUILD_SRC),)
 159
 160 # We process the rest of the Makefile if this is the final invocation of make
 161 ifeq ($(skip-makefile),)
 162
 163 # Do not print "Entering directory ...",
 164 # but we want to display it when entering to the output directory
 165 # so that IDEs/editors are able to understand relative filenames.
 166 MAKEFLAGS += --no-print-directory
 167
 168 # Call a source code checker (by default, "sparse") as part of the
 169 # C compilation.
 170 #
 171 # Use 'make C=1' to enable checking of only re-compiled files.
 172 # Use 'make C=2' to enable checking of *all* source files, regardless
 173 # of whether they are re-compiled or not.
 174 #
 175 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 176 # including where to get the "sparse" utility.
 177
 178 ifeq ("$(origin C)", "command line")
 179   KBUILD_CHECKSRC = $(C)
 180 endif
 181 ifndef KBUILD_CHECKSRC
 182   KBUILD_CHECKSRC = 0
 183 endif
 184
 185 # Use make M=dir to specify directory of external module to build
 186 # Old syntax make ... SUBDIRS=$PWD is still supported
 187 # Setting the environment variable KBUILD_EXTMOD take precedence
 188 ifdef SUBDIRS
 189   $(warning ================= WARNING ================)
 190   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 191   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 192   $(warning ==========================================)
 193   KBUILD_EXTMOD ?= $(SUBDIRS)
 194 endif
 195
 196 ifeq ("$(origin M)", "command line")
 197   KBUILD_EXTMOD := $(M)
 198 endif
 199
 200 ifeq ($(KBUILD_SRC),)
 201         # building in the source tree
 202         srctree := .
 203 else
 204         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 205                 # building in a subdirectory of the source tree
 206                 srctree := ..
 207         else
 208                 srctree := $(KBUILD_SRC)
 209         endif
 210 endif
 211
 212 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 213
 214 objtree         := .
 215 src             := $(srctree)
 216 obj             := $(objtree)
 217
 218 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 219
 220 export srctree objtree VPATH
 221
 222 # To make sure we do not include .config for any of the *config targets
 223 # catch them early, and hand them over to scripts/kconfig/Makefile
 224 # It is allowed to specify more targets when calling make, including
 225 # mixing *config targets and build targets.
 226 # For example 'make oldconfig all'.
 227 # Detect when mixed targets is specified, and make a second invocation
 228 # of make so .config is not included in this case either (for *config).
 229
 230 version_h := include/generated/uapi/linux/version.h
 231 old_version_h := include/linux/version.h
 232
 233 clean-targets := %clean mrproper cleandocs
 234 no-dot-config-targets := $(clean-targets) \
 235                          cscope gtags TAGS tags help% %docs check% coccicheck \
 236                          $(version_h) headers_% archheaders archscripts \
 237                          %asm-generic kernelversion %src-pkg
 238 no-sync-config-targets := $(no-dot-config-targets) install %install \
 239                            kernelrelease
 240
 241 config-targets  := 0
 242 mixed-targets   := 0
 243 dot-config      := 1
 244 may-sync-config := 1
 245
 246 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 247         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 248                 dot-config := 0
 249         endif
 250 endif
 251
 252 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 253         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 254                 may-sync-config := 0
 255         endif
 256 endif
 257
 258 ifneq ($(KBUILD_EXTMOD),)
 259         may-sync-config := 0
 260 endif
 261
 262 ifeq ($(KBUILD_EXTMOD),)
 263         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 264                 config-targets := 1
 265                 ifneq ($(words $(MAKECMDGOALS)),1)
 266                         mixed-targets := 1
 267                 endif
 268         endif
 269 endif
 270
 271 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 272 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 273         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 274                 mixed-targets := 1
 275         endif
 276 endif
 277
 278 # install and modules_install need also be processed one by one
 279 ifneq ($(filter install,$(MAKECMDGOALS)),)
 280         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 281                 mixed-targets := 1
 282         endif
 283 endif
 284
 285 ifeq ($(mixed-targets),1)
 286 # ===========================================================================
 287 # We're called with mixed targets (*config and build targets).
 288 # Handle them one by one.
 289
 290 PHONY += $(MAKECMDGOALS) __build_one_by_one
 291
 292 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 293         @:
 294
 295 __build_one_by_one:
 296         $(Q)set -e; \
 297         for i in $(MAKECMDGOALS); do \
 298                 $(MAKE) -f $(srctree)/Makefile $$i; \
 299         done
 300
 301 else
 302
 303 # We need some generic definitions (do not try to remake the file).
 304 scripts/Kbuild.include: ;
 305 include scripts/Kbuild.include
 306
 307 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 308 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 309 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 310 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 311
 312 include scripts/subarch.include
 313
 314 # Cross compiling and selecting different set of gcc/bin-utils
 315 # ---------------------------------------------------------------------------
 316 #
 317 # When performing cross compilation for other architectures ARCH shall be set
 318 # to the target architecture. (See arch/* for the possibilities).
 319 # ARCH can be set during invocation of make:
 320 # make ARCH=ia64
 321 # Another way is to have ARCH set in the environment.
 322 # The default ARCH is the host where make is executed.
 323
 324 # CROSS_COMPILE specify the prefix used for all executables used
 325 # during compilation. Only gcc and related bin-utils executables
 326 # are prefixed with $(CROSS_COMPILE).
 327 # CROSS_COMPILE can be set on the command line
 328 # make CROSS_COMPILE=ia64-linux-
 329 # Alternatively CROSS_COMPILE can be set in the environment.
 330 # Default value for CROSS_COMPILE is not to prefix executables
 331 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 332 ARCH            ?= $(SUBARCH)
 333
 334 # Architecture as present in compile.h
 335 UTS_MACHINE     := $(ARCH)
 336 SRCARCH         := $(ARCH)
 337
 338 # Additional ARCH settings for x86
 339 ifeq ($(ARCH),i386)
 340         SRCARCH := x86
 341 endif
 342 ifeq ($(ARCH),x86_64)
 343         SRCARCH := x86
 344 endif
 345
 346 # Additional ARCH settings for sparc
 347 ifeq ($(ARCH),sparc32)
 348        SRCARCH := sparc
 349 endif
 350 ifeq ($(ARCH),sparc64)
 351        SRCARCH := sparc
 352 endif
 353
 354 # Additional ARCH settings for sh
 355 ifeq ($(ARCH),sh64)
 356        SRCARCH := sh
 357 endif
 358
 359 KCONFIG_CONFIG  ?= .config
 360 export KCONFIG_CONFIG
 361
 362 # SHELL used by kbuild
 363 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 364           else if [ -x /bin/bash ]; then echo /bin/bash; \
 365           else echo sh; fi ; fi)
 366
 367 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 368 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 369 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 370
 371 HOSTCC       = gcc
 372 HOSTCXX      = g++
 373 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 374                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 375                 $(HOSTCFLAGS)
 376 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 377 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 378 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 379
 380 # Make variables (CC, etc...)
 381 AS              = $(CROSS_COMPILE)as
 382 LD              = $(CROSS_COMPILE)ld
 383 CC              = $(CROSS_COMPILE)gcc
 384 CPP             = $(CC) -E
 385 AR              = $(CROSS_COMPILE)ar
 386 NM              = $(CROSS_COMPILE)nm
 387 STRIP           = $(CROSS_COMPILE)strip
 388 OBJCOPY         = $(CROSS_COMPILE)objcopy
 389 OBJDUMP         = $(CROSS_COMPILE)objdump
 390 LEX             = flex
 391 YACC            = bison
 392 AWK             = awk
 393 GENKSYMS        = scripts/genksyms/genksyms
 394 INSTALLKERNEL  := installkernel
 395 DEPMOD          = /sbin/depmod
 396 PERL            = perl
 397 PYTHON          = python
 398 PYTHON2         = python2
 399 PYTHON3         = python3
 400 CHECK           = sparse
 401
 402 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 403                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 404 NOSTDINC_FLAGS  =
 405 CFLAGS_MODULE   =
 406 AFLAGS_MODULE   =
 407 LDFLAGS_MODULE  =
 408 CFLAGS_KERNEL   =
 409 AFLAGS_KERNEL   =
 410 LDFLAGS_vmlinux =
 411
 412 # Use USERINCLUDE when you must reference the UAPI directories only.
 413 USERINCLUDE    := \
 414                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 415                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 416                 -I$(srctree)/include/uapi \
 417                 -I$(objtree)/include/generated/uapi \
 418                 -include $(srctree)/include/linux/kconfig.h
 419
 420 # Use LINUXINCLUDE when you must reference the include/ directory.
 421 # Needed to be compatible with the O= option
 422 LINUXINCLUDE    := \
 423                 -I$(srctree)/arch/$(SRCARCH)/include \
 424                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 425                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 426                 -I$(objtree)/include \
 427                 $(USERINCLUDE)
 428
 429 KBUILD_AFLAGS   := -D__ASSEMBLY__
 430 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 431                    -fno-strict-aliasing -fno-common -fshort-wchar \
 432                    -Werror-implicit-function-declaration \
 433                    -Wno-format-security \
 434                    -std=gnu89
 435 KBUILD_CPPFLAGS := -D__KERNEL__
 436 KBUILD_AFLAGS_KERNEL :=
 437 KBUILD_CFLAGS_KERNEL :=
 438 KBUILD_AFLAGS_MODULE  := -DMODULE
 439 KBUILD_CFLAGS_MODULE  := -DMODULE
 440 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 441 KBUILD_LDFLAGS :=
 442 GCC_PLUGINS_CFLAGS :=
 443
 444 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 445 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 446 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 447 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 448
 449 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 450 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 451 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 452 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 453 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 454 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 455 export KBUILD_ARFLAGS
 456
 457 # When compiling out-of-tree modules, put MODVERDIR in the module
 458 # tree rather than in the kernel tree. The kernel tree might
 459 # even be read-only.
 460 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 461
 462 # Files to ignore in find ... statements
 463
 464 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 465                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 466                           -prune -o
 467 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 468                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 469
 470 # ===========================================================================
 471 # Rules shared between *config targets and build targets
 472
 473 # Basic helpers built in scripts/basic/
 474 PHONY += scripts_basic
 475 scripts_basic:
 476         $(Q)$(MAKE) $(build)=scripts/basic
 477         $(Q)rm -f .tmp_quiet_recordmcount
 478
 479 # To avoid any implicit rule to kick in, define an empty command.
 480 scripts/basic/%: scripts_basic ;
 481
 482 PHONY += outputmakefile
 483 # outputmakefile generates a Makefile in the output directory, if using a
 484 # separate output directory. This allows convenient use of make in the
 485 # output directory.
 486 outputmakefile:
 487 ifneq ($(KBUILD_SRC),)
 488         $(Q)ln -fsn $(srctree) source
 489         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 490 endif
 491
 492 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 493 ifneq ($(CROSS_COMPILE),)
 494 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 495 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
 496 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 497 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 498 endif
 499 ifneq ($(GCC_TOOLCHAIN),)
 500 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 501 endif
 502 CLANG_FLAGS     += -no-integrated-as
 503 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 504 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 505 export CLANG_FLAGS
 506 endif
 507
 508 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 509 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 510 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 511 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 512 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 513 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 514 export RETPOLINE_CFLAGS
 515 export RETPOLINE_VDSO_CFLAGS
 516
 517 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 518 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 519
 520 # check for 'asm goto'
 521 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 522   CC_HAVE_ASM_GOTO := 1
 523   KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 524   KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 525 endif
 526
 527 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 528 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 529 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 530 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 531 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 532
 533 ifeq ($(config-targets),1)
 534 # ===========================================================================
 535 # *config targets only - make sure prerequisites are updated, and descend
 536 # in scripts/kconfig to make the *config target
 537
 538 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 539 # KBUILD_DEFCONFIG may point out an alternative default configuration
 540 # used for 'make defconfig'
 541 include arch/$(SRCARCH)/Makefile
 542 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 543
 544 config: scripts_basic outputmakefile FORCE
 545         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 546
 547 %config: scripts_basic outputmakefile FORCE
 548         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 549
 550 else
 551 # ===========================================================================
 552 # Build targets only - this includes vmlinux, arch specific targets, clean
 553 # targets and others. In general all targets except *config targets.
 554
 555 # If building an external module we do not care about the all: rule
 556 # but instead _all depend on modules
 557 PHONY += all
 558 ifeq ($(KBUILD_EXTMOD),)
 559 _all: all
 560 else
 561 _all: modules
 562 endif
 563
 564 # Decide whether to build built-in, modular, or both.
 565 # Normally, just do built-in.
 566
 567 KBUILD_MODULES :=
 568 KBUILD_BUILTIN := 1
 569
 570 # If we have only "make modules", don't compile built-in objects.
 571 # When we're building modules with modversions, we need to consider
 572 # the built-in objects during the descend as well, in order to
 573 # make sure the checksums are up to date before we record them.
 574
 575 ifeq ($(MAKECMDGOALS),modules)
 576   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 577 endif
 578
 579 # If we have "make <whatever> modules", compile modules
 580 # in addition to whatever we do anyway.
 581 # Just "make" or "make all" shall build modules as well
 582
 583 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 584   KBUILD_MODULES := 1
 585 endif
 586
 587 ifeq ($(MAKECMDGOALS),)
 588   KBUILD_MODULES := 1
 589 endif
 590
 591 export KBUILD_MODULES KBUILD_BUILTIN
 592
 593 ifeq ($(KBUILD_EXTMOD),)
 594 # Objects we will link into vmlinux / subdirs we need to visit
 595 init-y          := init/
 596 drivers-y       := drivers/ sound/ firmware/
 597 net-y           := net/
 598 libs-y          := lib/
 599 core-y          := usr/
 600 virt-y          := virt/
 601 endif # KBUILD_EXTMOD
 602
 603 ifeq ($(dot-config),1)
 604 include include/config/auto.conf
 605 endif
 606
 607 # The all: target is the default when no target is given on the
 608 # command line.
 609 # This allow a user to issue only 'make' to build a kernel including modules
 610 # Defaults to vmlinux, but the arch makefile usually adds further targets
 611 all: vmlinux
 612
 613 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 614         $(call cc-option,-fno-tree-loop-im) \
 615         $(call cc-disable-warning,maybe-uninitialized,)
 616 export CFLAGS_GCOV
 617
 618 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 619 ifdef CONFIG_FUNCTION_TRACER
 620   CC_FLAGS_FTRACE := -pg
 621 endif
 622
 623 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 624 # values of the respective KBUILD_* variables
 625 ARCH_CPPFLAGS :=
 626 ARCH_AFLAGS :=
 627 ARCH_CFLAGS :=
 628 include arch/$(SRCARCH)/Makefile
 629
 630 ifeq ($(dot-config),1)
 631 ifeq ($(may-sync-config),1)
 632 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 633 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 634 # because some architectures define CROSS_COMPILE there.
 635 -include include/config/auto.conf.cmd
 636
 637 # To avoid any implicit rule to kick in, define an empty command
 638 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 639
 640 # The actual configuration files used during the build are stored in
 641 # include/generated/ and include/config/. Update them if .config is newer than
 642 # include/config/auto.conf (which mirrors .config).
 643 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 644         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 645 else
 646 # External modules and some install targets need include/generated/autoconf.h
 647 # and include/config/auto.conf but do not care if they are up-to-date.
 648 # Use auto.conf to trigger the test
 649 PHONY += include/config/auto.conf
 650
 651 include/config/auto.conf:
 652         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 653         echo >&2;                                                       \
 654         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 655         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 656         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 657         echo >&2 ;                                                      \
 658         /bin/false)
 659
 660 endif # may-sync-config
 661 endif # $(dot-config)
 662
 663 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 664 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 665 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 666 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 667 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 668
 669 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 670 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 671 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 672 else
 673 ifdef CONFIG_PROFILE_ALL_BRANCHES
 674 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 675 else
 676 KBUILD_CFLAGS   += -O2
 677 endif
 678 endif
 679
 680 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 681                         $(call cc-disable-warning,maybe-uninitialized,))
 682
 683 # Tell gcc to never replace conditional load with a non-conditional one
 684 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 685
 686 include scripts/Makefile.kcov
 687 include scripts/Makefile.gcc-plugins
 688
 689 ifdef CONFIG_READABLE_ASM
 690 # Disable optimizations that make assembler listings hard to read.
 691 # reorder blocks reorders the control in the function
 692 # ipa clone creates specialized cloned functions
 693 # partial inlining inlines only parts of functions
 694 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 695                  $(call cc-option,-fno-ipa-cp-clone,) \
 696                  $(call cc-option,-fno-partial-inlining)
 697 endif
 698
 699 ifneq ($(CONFIG_FRAME_WARN),0)
 700 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 701 endif
 702
 703 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 704 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 705 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 706
 707 KBUILD_CFLAGS += $(stackp-flags-y)
 708
 709 ifdef CONFIG_CC_IS_CLANG
 710 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 711 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 712 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 713 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 714 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 715 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 716 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 717 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 718 # See modpost pattern 2
 719 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 720 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 721 else
 722
 723 # These warnings generated too much noise in a regular build.
 724 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 725 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 726 endif
 727
 728 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 729 ifdef CONFIG_FRAME_POINTER
 730 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 731 else
 732 # Some targets (ARM with Thumb2, for example), can't be built with frame
 733 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 734 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 735 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 736 # -fomit-frame-pointer with FUNCTION_TRACER.
 737 ifndef CONFIG_FUNCTION_TRACER
 738 KBUILD_CFLAGS   += -fomit-frame-pointer
 739 endif
 740 endif
 741
 742 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 743
 744 ifdef CONFIG_DEBUG_INFO
 745 ifdef CONFIG_DEBUG_INFO_SPLIT
 746 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 747 else
 748 KBUILD_CFLAGS   += -g
 749 endif
 750 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 751 endif
 752 ifdef CONFIG_DEBUG_INFO_DWARF4
 753 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 754 endif
 755
 756 ifdef CONFIG_DEBUG_INFO_REDUCED
 757 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 758                    $(call cc-option,-fno-var-tracking)
 759 endif
 760
 761 ifdef CONFIG_FUNCTION_TRACER
 762 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 763   # gcc 5 supports generating the mcount tables directly
 764   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 765     CC_FLAGS_FTRACE     += -mrecord-mcount
 766     export CC_USING_RECORD_MCOUNT := 1
 767   endif
 768   ifdef CONFIG_HAVE_NOP_MCOUNT
 769     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 770       CC_FLAGS_FTRACE   += -mnop-mcount
 771       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 772     endif
 773   endif
 774 endif
 775 ifdef CONFIG_HAVE_FENTRY
 776   ifeq ($(call cc-option-yn, -mfentry),y)
 777     CC_FLAGS_FTRACE     += -mfentry
 778     CC_FLAGS_USING      += -DCC_USING_FENTRY
 779   endif
 780 endif
 781 export CC_FLAGS_FTRACE
 782 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 783 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 784 ifdef CONFIG_DYNAMIC_FTRACE
 785         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 786                 BUILD_C_RECORDMCOUNT := y
 787                 export BUILD_C_RECORDMCOUNT
 788         endif
 789 endif
 790 endif
 791
 792 # We trigger additional mismatches with less inlining
 793 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 794 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 795 endif
 796
 797 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 798 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 799 LDFLAGS_vmlinux += --gc-sections
 800 endif
 801
 802 # arch Makefile may override CC so keep this after arch Makefile is included
 803 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 804
 805 # warn about C99 declaration after statement
 806 KBUILD_CFLAGS += -Wdeclaration-after-statement
 807
 808 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 809 KBUILD_CFLAGS += $(call cc-option,-Wvla)
 810
 811 # disable pointer signed / unsigned warnings in gcc 4.0
 812 KBUILD_CFLAGS += -Wno-pointer-sign
 813
 814 # disable stringop warnings in gcc 8+
 815 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 816
 817 # disable invalid "can't wrap" optimizations for signed / pointers
 818 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 819
 820 # clang sets -fmerge-all-constants by default as optimization, but this
 821 # is non-conforming behavior for C and in fact breaks the kernel, so we
 822 # need to disable it here generally.
 823 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 824
 825 # for gcc -fno-merge-all-constants disables everything, but it is fine
 826 # to have actual conforming behavior enabled.
 827 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 828
 829 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 830 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 831
 832 # conserve stack if available
 833 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 834
 835 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 836 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 837
 838 # require functions to have arguments in prototypes, not empty 'int foo()'
 839 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 840
 841 # Prohibit date/time macros, which would make the build non-deterministic
 842 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 843
 844 # enforce correct pointer usage
 845 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 846
 847 # Require designated initializers for all marked structures
 848 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 849
 850 # change __FILE__ to the relative path from the srctree
 851 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 852
 853 # use the deterministic mode of AR if available
 854 KBUILD_ARFLAGS := $(call ar-option,D)
 855
 856 include scripts/Makefile.kasan
 857 include scripts/Makefile.extrawarn
 858 include scripts/Makefile.ubsan
 859
 860 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 861 # last assignments
 862 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 863 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 864 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 865
 866 # Use --build-id when available.
 867 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 868 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 869 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 870
 871 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 872 LDFLAGS_vmlinux += $(call ld-option, -X,)
 873 endif
 874
 875 # insure the checker run with the right endianness
 876 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 877
 878 # the checker needs the correct machine size
 879 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 880
 881 # Default kernel image to build when no specific target is given.
 882 # KBUILD_IMAGE may be overruled on the command line or
 883 # set in the environment
 884 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 885 # this default value
 886 export KBUILD_IMAGE ?= vmlinux
 887
 888 #
 889 # INSTALL_PATH specifies where to place the updated kernel and system map
 890 # images. Default is /boot, but you can set it to other values
 891 export  INSTALL_PATH ?= /boot
 892
 893 #
 894 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 895 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 896 # an argument if needed. Otherwise it defaults to the kernel install path
 897 #
 898 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 899
 900 #
 901 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 902 # relocations required by build roots.  This is not defined in the
 903 # makefile but the argument can be passed to make if needed.
 904 #
 905
 906 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 907 export MODLIB
 908
 909 #
 910 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 911 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 912 # the default option --strip-debug will be used.  Otherwise,
 913 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 914
 915 ifdef INSTALL_MOD_STRIP
 916 ifeq ($(INSTALL_MOD_STRIP),1)
 917 mod_strip_cmd = $(STRIP) --strip-debug
 918 else
 919 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 920 endif # INSTALL_MOD_STRIP=1
 921 else
 922 mod_strip_cmd = true
 923 endif # INSTALL_MOD_STRIP
 924 export mod_strip_cmd
 925
 926 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 927 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 928 # or CONFIG_MODULE_COMPRESS_XZ.
 929
 930 mod_compress_cmd = true
 931 ifdef CONFIG_MODULE_COMPRESS
 932   ifdef CONFIG_MODULE_COMPRESS_GZIP
 933     mod_compress_cmd = gzip -n -f
 934   endif # CONFIG_MODULE_COMPRESS_GZIP
 935   ifdef CONFIG_MODULE_COMPRESS_XZ
 936     mod_compress_cmd = xz -f
 937   endif # CONFIG_MODULE_COMPRESS_XZ
 938 endif # CONFIG_MODULE_COMPRESS
 939 export mod_compress_cmd
 940
 941 # Select initial ramdisk compression format, default is gzip(1).
 942 # This shall be used by the dracut(8) tool while creating an initramfs image.
 943 #
 944 INITRD_COMPRESS-y                  := gzip
 945 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 946 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 947 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 948 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 949 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 950 # do not export INITRD_COMPRESS, since we didn't actually
 951 # choose a sane default compression above.
 952 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 953
 954 ifdef CONFIG_MODULE_SIG_ALL
 955 $(eval $(call config_filename,MODULE_SIG_KEY))
 956
 957 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 958 else
 959 mod_sign_cmd = true
 960 endif
 961 export mod_sign_cmd
 962
 963 ifdef CONFIG_STACK_VALIDATION
 964   has_libelf := $(call try-run,\
 965                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 966   ifeq ($(has_libelf),1)
 967     objtool_target := tools/objtool FORCE
 968   else
 969     ifdef CONFIG_UNWINDER_ORC
 970       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 971     else
 972       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 973     endif
 974     SKIP_STACK_VALIDATION := 1
 975     export SKIP_STACK_VALIDATION
 976   endif
 977 endif
 978
 979
 980 ifeq ($(KBUILD_EXTMOD),)
 981 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 982
 983 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 984                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 985                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 986
 987 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 988                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 989
 990 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 991 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 992 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 993 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 994 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 995 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 996 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 997
 998 # Externally visible symbols (used by link-vmlinux.sh)
 999 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1000 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1001 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1002 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1003 export LDFLAGS_vmlinux
1004 # used by scripts/package/Makefile
1005 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1006
1007 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1008
1009 # Recurse until adjust_autoksyms.sh is satisfied
1010 PHONY += autoksyms_recursive
1011 autoksyms_recursive: $(vmlinux-deps)
1012 ifdef CONFIG_TRIM_UNUSED_KSYMS
1013         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1014           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1015 endif
1016
1017 # For the kernel to actually contain only the needed exported symbols,
1018 # we have to build modules as well to determine what those symbols are.
1019 # (this can be evaluated only once include/config/auto.conf has been included)
1020 ifdef CONFIG_TRIM_UNUSED_KSYMS
1021   KBUILD_MODULES := 1
1022 endif
1023
1024 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1025
1026 $(autoksyms_h):
1027         $(Q)mkdir -p $(dir $@)
1028         $(Q)touch $@
1029
1030 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1031
1032 # Final link of vmlinux with optional arch pass after final link
1033 cmd_link-vmlinux =                                                 \
1034         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1035         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1036
1037 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1038 ifdef CONFIG_GDB_SCRIPTS
1039         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1040 endif
1041         +$(call if_changed,link-vmlinux)
1042
1043 targets := vmlinux
1044
1045 # Build samples along the rest of the kernel. This needs headers_install.
1046 ifdef CONFIG_SAMPLES
1047 vmlinux-dirs += samples
1048 samples: headers_install
1049 endif
1050
1051 # The actual objects are generated when descending,
1052 # make sure no implicit rule kicks in
1053 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1054
1055 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1056 # Preset locale variables to speed up the build process. Limit locale
1057 # tweaks to this spot to avoid wrong language settings when running
1058 # make menuconfig etc.
1059 # Error messages still appears in the original language
1060
1061 PHONY += $(vmlinux-dirs)
1062 $(vmlinux-dirs): prepare
1063         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1064
1065 define filechk_kernel.release
1066         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1067 endef
1068
1069 # Store (new) KERNELRELEASE string in include/config/kernel.release
1070 include/config/kernel.release: $(srctree)/Makefile FORCE
1071         $(call filechk,kernel.release)
1072
1073 # Additional helpers built in scripts/
1074 # Carefully list dependencies so we do not try to build scripts twice
1075 # in parallel
1076 PHONY += scripts
1077 scripts: scripts_basic scripts_dtc
1078         $(Q)$(MAKE) $(build)=$(@)
1079
1080 # Things we need to do before we recursively start building the kernel
1081 # or the modules are listed in "prepare".
1082 # A multi level approach is used. prepareN is processed before prepareN-1.
1083 # archprepare is used in arch Makefiles and when processed asm symlink,
1084 # version.h and scripts_basic is processed / created.
1085
1086 # Listed in dependency order
1087 PHONY += prepare archprepare macroprepare prepare0 prepare1 prepare2 prepare3
1088
1089 # prepare3 is used to check if we are building in a separate output directory,
1090 # and if so do:
1091 # 1) Check that make has not been executed in the kernel src $(srctree)
1092 prepare3: include/config/kernel.release
1093 ifneq ($(KBUILD_SRC),)
1094         @$(kecho) '  Using $(srctree) as source for kernel'
1095         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1096                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1097                 echo >&2 "  in the '$(srctree)' directory.";\
1098                 /bin/false; \
1099         fi;
1100 endif
1101
1102 # prepare2 creates a makefile if using a separate output directory.
1103 # From this point forward, .config has been reprocessed, so any rules
1104 # that need to depend on updated CONFIG_* values can be checked here.
1105 prepare2: prepare3 outputmakefile asm-generic
1106
1107 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1108         $(cmd_crmodverdir)
1109
1110 macroprepare: prepare1 archmacros
1111
1112 archprepare: archheaders archscripts macroprepare scripts
1113
1114 prepare0: archprepare
1115         $(Q)$(MAKE) $(build)=scripts/mod
1116         $(Q)$(MAKE) $(build)=.
1117
1118 # All the preparing..
1119 prepare: prepare0 prepare-objtool
1120
1121 # Support for using generic headers in asm-generic
1122 PHONY += asm-generic uapi-asm-generic
1123 asm-generic: uapi-asm-generic
1124         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1125                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1126 uapi-asm-generic:
1127         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1128                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1129
1130 PHONY += prepare-objtool
1131 prepare-objtool: $(objtool_target)
1132
1133 # Generate some files
1134 # ---------------------------------------------------------------------------
1135
1136 # KERNELRELEASE can change from a few different places, meaning version.h
1137 # needs to be updated, so this check is forced on all builds
1138
1139 uts_len := 64
1140 define filechk_utsrelease.h
1141         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1142           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1143           exit 1;                                                         \
1144         fi;                                                               \
1145         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1146 endef
1147
1148 define filechk_version.h
1149         (echo \#define LINUX_VERSION_CODE $(shell                         \
1150         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1151         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1152 endef
1153
1154 $(version_h): FORCE
1155         $(call filechk,version.h)
1156         $(Q)rm -f $(old_version_h)
1157
1158 include/generated/utsrelease.h: include/config/kernel.release FORCE
1159         $(call filechk,utsrelease.h)
1160
1161 PHONY += headerdep
1162 headerdep:
1163         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1164         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1165
1166 # ---------------------------------------------------------------------------
1167 # Kernel headers
1168
1169 #Default location for installed headers
1170 export INSTALL_HDR_PATH = $(objtree)/usr
1171
1172 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1173 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1174
1175 PHONY += archheaders
1176 archheaders:
1177
1178 PHONY += archscripts
1179 archscripts:
1180
1181 PHONY += archmacros
1182 archmacros:
1183
1184 PHONY += __headers
1185 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1186         $(Q)$(MAKE) $(build)=scripts build_unifdef
1187
1188 PHONY += headers_install_all
1189 headers_install_all:
1190         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1191
1192 PHONY += headers_install
1193 headers_install: __headers
1194         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1195           $(error Headers not exportable for the $(SRCARCH) architecture))
1196         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1197         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1198
1199 PHONY += headers_check_all
1200 headers_check_all: headers_install_all
1201         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1202
1203 PHONY += headers_check
1204 headers_check: headers_install
1205         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1206         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1207
1208 ifdef CONFIG_HEADERS_CHECK
1209 all: headers_check
1210 endif
1211
1212 # ---------------------------------------------------------------------------
1213 # Kernel selftest
1214
1215 PHONY += kselftest
1216 kselftest:
1217         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1218
1219 PHONY += kselftest-clean
1220 kselftest-clean:
1221         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1222
1223 PHONY += kselftest-merge
1224 kselftest-merge:
1225         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1226         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1227                 -m $(objtree)/.config \
1228                 $(srctree)/tools/testing/selftests/*/config
1229         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1230
1231 # ---------------------------------------------------------------------------
1232 # Devicetree files
1233
1234 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1235 dtstree := arch/$(SRCARCH)/boot/dts
1236 endif
1237
1238 ifneq ($(dtstree),)
1239
1240 %.dtb: prepare3 scripts_dtc
1241         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1242
1243 PHONY += dtbs dtbs_install
1244 dtbs: prepare3 scripts_dtc
1245         $(Q)$(MAKE) $(build)=$(dtstree)
1246
1247 dtbs_install:
1248         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1249
1250 ifdef CONFIG_OF_EARLY_FLATTREE
1251 all: dtbs
1252 endif
1253
1254 endif
1255
1256 PHONY += scripts_dtc
1257 scripts_dtc: scripts_basic
1258         $(Q)$(MAKE) $(build)=scripts/dtc
1259
1260 # ---------------------------------------------------------------------------
1261 # Modules
1262
1263 ifdef CONFIG_MODULES
1264
1265 # By default, build modules as well
1266
1267 all: modules
1268
1269 # Build modules
1270 #
1271 # A module can be listed more than once in obj-m resulting in
1272 # duplicate lines in modules.order files.  Those are removed
1273 # using awk while concatenating to the final file.
1274
1275 PHONY += modules
1276 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1277         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1278         @$(kecho) '  Building modules, stage 2.';
1279         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1280
1281 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1282         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1283
1284 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1285         $(Q)$(MAKE) $(modbuiltin)=$*
1286
1287
1288 # Target to prepare building external modules
1289 PHONY += modules_prepare
1290 modules_prepare: prepare
1291
1292 # Target to install modules
1293 PHONY += modules_install
1294 modules_install: _modinst_ _modinst_post
1295
1296 PHONY += _modinst_
1297 _modinst_:
1298         @rm -rf $(MODLIB)/kernel
1299         @rm -f $(MODLIB)/source
1300         @mkdir -p $(MODLIB)/kernel
1301         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1302         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1303                 rm -f $(MODLIB)/build ; \
1304                 ln -s $(CURDIR) $(MODLIB)/build ; \
1305         fi
1306         @cp -f $(objtree)/modules.order $(MODLIB)/
1307         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1308         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1309
1310 # This depmod is only for convenience to give the initial
1311 # boot a modules.dep even before / is mounted read-write.  However the
1312 # boot script depmod is the master version.
1313 PHONY += _modinst_post
1314 _modinst_post: _modinst_
1315         $(call cmd,depmod)
1316
1317 ifeq ($(CONFIG_MODULE_SIG), y)
1318 PHONY += modules_sign
1319 modules_sign:
1320         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1321 endif
1322
1323 else # CONFIG_MODULES
1324
1325 # Modules not configured
1326 # ---------------------------------------------------------------------------
1327
1328 PHONY += modules modules_install
1329 modules modules_install:
1330         @echo >&2
1331         @echo >&2 "The present kernel configuration has modules disabled."
1332         @echo >&2 "Type 'make config' and enable loadable module support."
1333         @echo >&2 "Then build a kernel with module support enabled."
1334         @echo >&2
1335         @exit 1
1336
1337 endif # CONFIG_MODULES
1338
1339 ###
1340 # Cleaning is done on three levels.
1341 # make clean     Delete most generated files
1342 #                Leave enough to build external modules
1343 # make mrproper  Delete the current configuration, and all generated files
1344 # make distclean Remove editor backup files, patch leftover files and the like
1345
1346 # Directories & files removed with 'make clean'
1347 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1348
1349 # Directories & files removed with 'make mrproper'
1350 MRPROPER_DIRS  += include/config usr/include include/generated          \
1351                   arch/*/include/generated .tmp_objdiff
1352 MRPROPER_FILES += .config .config.old .version \
1353                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1354                   signing_key.pem signing_key.priv signing_key.x509     \
1355                   x509.genkey extra_certificates signing_key.x509.keyid \
1356                   signing_key.x509.signer vmlinux-gdb.py
1357
1358 # clean - Delete most, but leave enough to build external modules
1359 #
1360 clean: rm-dirs  := $(CLEAN_DIRS)
1361 clean: rm-files := $(CLEAN_FILES)
1362 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1363
1364 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1365 $(clean-dirs):
1366         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1367
1368 vmlinuxclean:
1369         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1370         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1371
1372 clean: archclean vmlinuxclean
1373
1374 # mrproper - Delete all generated files, including .config
1375 #
1376 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1377 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1378 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1379
1380 PHONY += $(mrproper-dirs) mrproper archmrproper
1381 $(mrproper-dirs):
1382         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1383
1384 mrproper: clean archmrproper $(mrproper-dirs)
1385         $(call cmd,rmdirs)
1386         $(call cmd,rmfiles)
1387
1388 # distclean
1389 #
1390 PHONY += distclean
1391
1392 distclean: mrproper
1393         @find $(srctree) $(RCS_FIND_IGNORE) \
1394                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1395                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1396                 -o -name 'core' \) \
1397                 -type f -print | xargs rm -f
1398
1399
1400 # Packaging of the kernel to various formats
1401 # ---------------------------------------------------------------------------
1402 package-dir     := scripts/package
1403
1404 %src-pkg: FORCE
1405         $(Q)$(MAKE) $(build)=$(package-dir) $@
1406 %pkg: include/config/kernel.release FORCE
1407         $(Q)$(MAKE) $(build)=$(package-dir) $@
1408
1409
1410 # Brief documentation of the typical targets used
1411 # ---------------------------------------------------------------------------
1412
1413 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1414 boards := $(sort $(notdir $(boards)))
1415 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1416 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1417
1418 PHONY += help
1419 help:
1420         @echo  'Cleaning targets:'
1421         @echo  '  clean           - Remove most generated files but keep the config and'
1422         @echo  '                    enough build support to build external modules'
1423         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1424         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1425         @echo  ''
1426         @echo  'Configuration targets:'
1427         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1428         @echo  ''
1429         @echo  'Other generic targets:'
1430         @echo  '  all             - Build all targets marked with [*]'
1431         @echo  '* vmlinux         - Build the bare kernel'
1432         @echo  '* modules         - Build all modules'
1433         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1434         @echo  '  dir/            - Build all files in dir and below'
1435         @echo  '  dir/file.[ois]  - Build specified target only'
1436         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1437         @echo  '                    (requires compiler support for LLVM assembly generation)'
1438         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1439         @echo  '                    (requires a recent binutils and recent build (System.map))'
1440         @echo  '  dir/file.ko     - Build module including final link'
1441         @echo  '  modules_prepare - Set up for building external modules'
1442         @echo  '  tags/TAGS       - Generate tags file for editors'
1443         @echo  '  cscope          - Generate cscope index'
1444         @echo  '  gtags           - Generate GNU GLOBAL index'
1445         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1446         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1447         @echo  '  image_name      - Output the image name (use with make -s)'
1448         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1449          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1450          echo  ''
1451         @echo  'Static analysers:'
1452         @echo  '  checkstack      - Generate a list of stack hogs'
1453         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1454         @echo  '  versioncheck    - Sanity check on version.h usage'
1455         @echo  '  includecheck    - Check for duplicate included header files'
1456         @echo  '  export_report   - List the usages of all exported symbols'
1457         @echo  '  headers_check   - Sanity check on exported headers'
1458         @echo  '  headerdep       - Detect inclusion cycles in headers'
1459         @echo  '  coccicheck      - Check with Coccinelle'
1460         @echo  ''
1461         @echo  'Kernel selftest:'
1462         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1463         @echo  '                    Build, install, and boot kernel before'
1464         @echo  '                    running kselftest on it'
1465         @echo  '  kselftest-clean - Remove all generated kselftest files'
1466         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1467         @echo  '                    .config.'
1468         @echo  ''
1469         @$(if $(dtstree), \
1470                 echo 'Devicetree:'; \
1471                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1472                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1473                 echo '')
1474
1475         @echo 'Userspace tools targets:'
1476         @echo '  use "make tools/help"'
1477         @echo '  or  "cd tools; make help"'
1478         @echo  ''
1479         @echo  'Kernel packaging:'
1480         @$(MAKE) $(build)=$(package-dir) help
1481         @echo  ''
1482         @echo  'Documentation targets:'
1483         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1484         @echo  ''
1485         @echo  'Architecture specific targets ($(SRCARCH)):'
1486         @$(if $(archhelp),$(archhelp),\
1487                 echo '  No architecture specific help defined for $(SRCARCH)')
1488         @echo  ''
1489         @$(if $(boards), \
1490                 $(foreach b, $(boards), \
1491                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1492                 echo '')
1493         @$(if $(board-dirs), \
1494                 $(foreach b, $(board-dirs), \
1495                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1496                 printf "  %-16s - Show all of the above\\n" help-boards; \
1497                 echo '')
1498
1499         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1500         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1501         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1502         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1503         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1504         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1505         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1506         @echo  '                1: warnings which may be relevant and do not occur too often'
1507         @echo  '                2: warnings which occur quite often but may still be relevant'
1508         @echo  '                3: more obscure warnings, can most likely be ignored'
1509         @echo  '                Multiple levels can be combined with W=12 or W=123'
1510         @echo  ''
1511         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1512         @echo  'For further info see the ./README file'
1513
1514
1515 help-board-dirs := $(addprefix help-,$(board-dirs))
1516
1517 help-boards: $(help-board-dirs)
1518
1519 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1520
1521 $(help-board-dirs): help-%:
1522         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1523         @$(if $(boards-per-dir), \
1524                 $(foreach b, $(boards-per-dir), \
1525                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1526                 echo '')
1527
1528
1529 # Documentation targets
1530 # ---------------------------------------------------------------------------
1531 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1532                linkcheckdocs dochelp refcheckdocs
1533 PHONY += $(DOC_TARGETS)
1534 $(DOC_TARGETS): scripts_basic FORCE
1535         $(Q)$(MAKE) $(build)=Documentation $@
1536
1537 else # KBUILD_EXTMOD
1538
1539 ###
1540 # External module support.
1541 # When building external modules the kernel used as basis is considered
1542 # read-only, and no consistency checks are made and the make
1543 # system is not used on the basis kernel. If updates are required
1544 # in the basis kernel ordinary make commands (without M=...) must
1545 # be used.
1546 #
1547 # The following are the only valid targets when building external
1548 # modules.
1549 # make M=dir clean     Delete all automatically generated files
1550 # make M=dir modules   Make all modules in specified dir
1551 # make M=dir           Same as 'make M=dir modules'
1552 # make M=dir modules_install
1553 #                      Install the modules built in the module directory
1554 #                      Assumes install directory is already created
1555
1556 # We are always building modules
1557 KBUILD_MODULES := 1
1558
1559 PHONY += $(objtree)/Module.symvers
1560 $(objtree)/Module.symvers:
1561         @test -e $(objtree)/Module.symvers || ( \
1562         echo; \
1563         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1564         echo "           is missing; modules will have no dependencies and modversions."; \
1565         echo )
1566
1567 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1568 PHONY += $(module-dirs) modules
1569 $(module-dirs): prepare $(objtree)/Module.symvers
1570         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1571
1572 modules: $(module-dirs)
1573         @$(kecho) '  Building modules, stage 2.';
1574         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1575
1576 PHONY += modules_install
1577 modules_install: _emodinst_ _emodinst_post
1578
1579 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1580 PHONY += _emodinst_
1581 _emodinst_:
1582         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1583         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1584
1585 PHONY += _emodinst_post
1586 _emodinst_post: _emodinst_
1587         $(call cmd,depmod)
1588
1589 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1590
1591 PHONY += $(clean-dirs) clean
1592 $(clean-dirs):
1593         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1594
1595 clean:  rm-dirs := $(MODVERDIR)
1596 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1597
1598 PHONY += help
1599 help:
1600         @echo  '  Building external modules.'
1601         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1602         @echo  ''
1603         @echo  '  modules         - default target, build the module(s)'
1604         @echo  '  modules_install - install the module'
1605         @echo  '  clean           - remove generated files in module directory only'
1606         @echo  ''
1607
1608 PHONY += prepare
1609 prepare:
1610         $(cmd_crmodverdir)
1611 endif # KBUILD_EXTMOD
1612
1613 clean: $(clean-dirs)
1614         $(call cmd,rmdirs)
1615         $(call cmd,rmfiles)
1616         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1617                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1618                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1619                 -o -name '*.dwo' -o -name '*.lst' \
1620                 -o -name '*.su'  \
1621                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1622                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1623                 -o -name '*.asn1.[ch]' \
1624                 -o -name '*.symtypes' -o -name 'modules.order' \
1625                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1626                 -o -name '*.c.[012]*.*' \
1627                 -o -name '*.ll' \
1628                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1629
1630 # Generate tags for editors
1631 # ---------------------------------------------------------------------------
1632 quiet_cmd_tags = GEN     $@
1633       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1634
1635 tags TAGS cscope gtags: FORCE
1636         $(call cmd,tags)
1637
1638 # Scripts to check various things for consistency
1639 # ---------------------------------------------------------------------------
1640
1641 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1642
1643 includecheck:
1644         find $(srctree)/* $(RCS_FIND_IGNORE) \
1645                 -name '*.[hcS]' -type f -print | sort \
1646                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1647
1648 versioncheck:
1649         find $(srctree)/* $(RCS_FIND_IGNORE) \
1650                 -name '*.[hcS]' -type f -print | sort \
1651                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1652
1653 coccicheck:
1654         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1655
1656 namespacecheck:
1657         $(PERL) $(srctree)/scripts/namespace.pl
1658
1659 export_report:
1660         $(PERL) $(srctree)/scripts/export_report.pl
1661
1662 PHONY += checkstack kernelrelease kernelversion image_name
1663
1664 # UML needs a little special treatment here.  It wants to use the host
1665 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1666 # else wants $(ARCH), including people doing cross-builds, which means
1667 # that $(SUBARCH) doesn't work here.
1668 ifeq ($(ARCH), um)
1669 CHECKSTACK_ARCH := $(SUBARCH)
1670 else
1671 CHECKSTACK_ARCH := $(ARCH)
1672 endif
1673 checkstack:
1674         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1675         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1676
1677 kernelrelease:
1678         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1679
1680 kernelversion:
1681         @echo $(KERNELVERSION)
1682
1683 image_name:
1684         @echo $(KBUILD_IMAGE)
1685
1686 # Clear a bunch of variables before executing the submake
1687 tools/: FORCE
1688         $(Q)mkdir -p $(objtree)/tools
1689         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1690
1691 tools/%: FORCE
1692         $(Q)mkdir -p $(objtree)/tools
1693         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1694
1695 # Single targets
1696 # ---------------------------------------------------------------------------
1697 # Single targets are compatible with:
1698 # - build with mixed source and output
1699 # - build with separate output dir 'make O=...'
1700 # - external modules
1701 #
1702 #  target-dir => where to store outputfile
1703 #  build-dir  => directory in kernel source tree to use
1704
1705 ifeq ($(KBUILD_EXTMOD),)
1706         build-dir  = $(patsubst %/,%,$(dir $@))
1707         target-dir = $(dir $@)
1708 else
1709         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1710         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1711         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1712 endif
1713
1714 %.s: %.c prepare FORCE
1715         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716 %.i: %.c prepare FORCE
1717         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718 %.o: %.c prepare FORCE
1719         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720 %.lst: %.c prepare FORCE
1721         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1722 %.s: %.S prepare FORCE
1723         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724 %.o: %.S prepare FORCE
1725         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1726 %.symtypes: %.c prepare FORCE
1727         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1728 %.ll: %.c prepare FORCE
1729         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1730
1731 # Modules
1732 /: prepare FORCE
1733         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1734         $(build)=$(build-dir)
1735 # Make sure the latest headers are built for Documentation
1736 Documentation/ samples/: headers_install
1737 %/: prepare FORCE
1738         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1739         $(build)=$(build-dir)
1740 %.ko: prepare FORCE
1741         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1742         $(build)=$(build-dir) $(@:.ko=.o)
1743         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1744
1745 # FIXME Should go into a make.lib or something
1746 # ===========================================================================
1747
1748 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1749       cmd_rmdirs = rm -rf $(rm-dirs)
1750
1751 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1752       cmd_rmfiles = rm -f $(rm-files)
1753
1754 # Run depmod only if we have System.map and depmod is executable
1755 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1756       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1757                    $(KERNELRELEASE)
1758
1759 # Create temporary dir for module support files
1760 # clean it up only when building all modules
1761 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1762                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1763
1764 # read saved command lines for existing targets
1765 existing-targets := $(wildcard $(sort $(targets)))
1766
1767 cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1768 $(cmd_files): ; # Do not try to update included dependency files
1769 -include $(cmd_files)
1770
1771 endif   # ifeq ($(config-targets),1)
1772 endif   # ifeq ($(mixed-targets),1)
1773 endif   # skip-makefile
1774
1775 PHONY += FORCE
1776 FORCE:
1777
1778 # Declare the contents of the PHONY variable as phony.  We keep that
1779 # information in a variable so we can use it in if_changed and friends.
1780 .PHONY: $(PHONY)