Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 0
   4 SUBLEVEL = 7
   5 EXTRAVERSION =
   6 NAME = Shy Crocodile
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub-make-done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95   tools_silent=s
  96 endif
  97
  98 export quiet Q KBUILD_VERBOSE
  99
 100 # kbuild supports saving output files in a separate directory.
 101 # To locate output files in a separate directory two syntaxes are supported.
 102 # In both cases the working directory must be the root of the kernel src.
 103 # 1) O=
 104 # Use "make O=dir/to/store/output/files/"
 105 #
 106 # 2) Set KBUILD_OUTPUT
 107 # Set the environment variable KBUILD_OUTPUT to point to the directory
 108 # where the output files shall be placed.
 109 # export KBUILD_OUTPUT=dir/to/store/output/files/
 110 # make
 111 #
 112 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 113 # variable.
 114
 115 # KBUILD_SRC is not intended to be used by the regular user (for now),
 116 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 # Look for make include files relative to root of kernel src
 140 #
 141 # This does not become effective immediately because MAKEFLAGS is re-parsed
 142 # once after the Makefile is read.  It is OK since we are going to invoke
 143 # 'sub-make' below.
 144 MAKEFLAGS += --include-dir=$(CURDIR)
 145
 146 need-sub-make := 1
 147 else
 148
 149 # Do not print "Entering directory ..." at all for in-tree build.
 150 MAKEFLAGS += --no-print-directory
 151
 152 endif # ifneq ($(KBUILD_OUTPUT),)
 153
 154 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 155 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 156 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 157 need-sub-make := 1
 158 # Cancel implicit rules for this Makefile.
 159 $(lastword $(MAKEFILE_LIST)): ;
 160 endif
 161
 162 ifeq ($(need-sub-make),1)
 163
 164 PHONY += $(MAKECMDGOALS) sub-make
 165
 166 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 167         @:
 168
 169 # Invoke a second make in the output directory, passing relevant variables
 170 sub-make:
 171         $(Q)$(MAKE) sub-make-done=1 \
 172         $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \
 173         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 174
 175 endif # need-sub-make
 176 endif # sub-make-done
 177
 178 # We process the rest of the Makefile if this is the final invocation of make
 179 ifeq ($(need-sub-make),)
 180
 181 # Do not print "Entering directory ...",
 182 # but we want to display it when entering to the output directory
 183 # so that IDEs/editors are able to understand relative filenames.
 184 MAKEFLAGS += --no-print-directory
 185
 186 # Call a source code checker (by default, "sparse") as part of the
 187 # C compilation.
 188 #
 189 # Use 'make C=1' to enable checking of only re-compiled files.
 190 # Use 'make C=2' to enable checking of *all* source files, regardless
 191 # of whether they are re-compiled or not.
 192 #
 193 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 194 # including where to get the "sparse" utility.
 195
 196 ifeq ("$(origin C)", "command line")
 197   KBUILD_CHECKSRC = $(C)
 198 endif
 199 ifndef KBUILD_CHECKSRC
 200   KBUILD_CHECKSRC = 0
 201 endif
 202
 203 # Use make M=dir to specify directory of external module to build
 204 # Old syntax make ... SUBDIRS=$PWD is still supported
 205 # Setting the environment variable KBUILD_EXTMOD take precedence
 206 ifdef SUBDIRS
 207   $(warning ================= WARNING ================)
 208   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 209   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 210   $(warning ==========================================)
 211   KBUILD_EXTMOD ?= $(SUBDIRS)
 212 endif
 213
 214 ifeq ("$(origin M)", "command line")
 215   KBUILD_EXTMOD := $(M)
 216 endif
 217
 218 ifeq ($(KBUILD_SRC),)
 219         # building in the source tree
 220         srctree := .
 221 else
 222         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 223                 # building in a subdirectory of the source tree
 224                 srctree := ..
 225         else
 226                 srctree := $(KBUILD_SRC)
 227         endif
 228 endif
 229
 230 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 231
 232 objtree         := .
 233 src             := $(srctree)
 234 obj             := $(objtree)
 235
 236 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 237
 238 export srctree objtree VPATH
 239
 240 # To make sure we do not include .config for any of the *config targets
 241 # catch them early, and hand them over to scripts/kconfig/Makefile
 242 # It is allowed to specify more targets when calling make, including
 243 # mixing *config targets and build targets.
 244 # For example 'make oldconfig all'.
 245 # Detect when mixed targets is specified, and make a second invocation
 246 # of make so .config is not included in this case either (for *config).
 247
 248 version_h := include/generated/uapi/linux/version.h
 249 old_version_h := include/linux/version.h
 250
 251 clean-targets := %clean mrproper cleandocs
 252 no-dot-config-targets := $(clean-targets) \
 253                          cscope gtags TAGS tags help% %docs check% coccicheck \
 254                          $(version_h) headers_% archheaders archscripts \
 255                          %asm-generic kernelversion %src-pkg
 256 no-sync-config-targets := $(no-dot-config-targets) install %install \
 257                            kernelrelease
 258
 259 config-targets  := 0
 260 mixed-targets   := 0
 261 dot-config      := 1
 262 may-sync-config := 1
 263
 264 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 265         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 266                 dot-config := 0
 267         endif
 268 endif
 269
 270 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 271         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 272                 may-sync-config := 0
 273         endif
 274 endif
 275
 276 ifneq ($(KBUILD_EXTMOD),)
 277         may-sync-config := 0
 278 endif
 279
 280 ifeq ($(KBUILD_EXTMOD),)
 281         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 282                 config-targets := 1
 283                 ifneq ($(words $(MAKECMDGOALS)),1)
 284                         mixed-targets := 1
 285                 endif
 286         endif
 287 endif
 288
 289 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 290 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 291         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 292                 mixed-targets := 1
 293         endif
 294 endif
 295
 296 # install and modules_install need also be processed one by one
 297 ifneq ($(filter install,$(MAKECMDGOALS)),)
 298         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 299                 mixed-targets := 1
 300         endif
 301 endif
 302
 303 ifeq ($(mixed-targets),1)
 304 # ===========================================================================
 305 # We're called with mixed targets (*config and build targets).
 306 # Handle them one by one.
 307
 308 PHONY += $(MAKECMDGOALS) __build_one_by_one
 309
 310 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 311         @:
 312
 313 __build_one_by_one:
 314         $(Q)set -e; \
 315         for i in $(MAKECMDGOALS); do \
 316                 $(MAKE) -f $(srctree)/Makefile $$i; \
 317         done
 318
 319 else
 320
 321 # We need some generic definitions (do not try to remake the file).
 322 scripts/Kbuild.include: ;
 323 include scripts/Kbuild.include
 324
 325 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 326 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 327 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 328 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 329
 330 include scripts/subarch.include
 331
 332 # Cross compiling and selecting different set of gcc/bin-utils
 333 # ---------------------------------------------------------------------------
 334 #
 335 # When performing cross compilation for other architectures ARCH shall be set
 336 # to the target architecture. (See arch/* for the possibilities).
 337 # ARCH can be set during invocation of make:
 338 # make ARCH=ia64
 339 # Another way is to have ARCH set in the environment.
 340 # The default ARCH is the host where make is executed.
 341
 342 # CROSS_COMPILE specify the prefix used for all executables used
 343 # during compilation. Only gcc and related bin-utils executables
 344 # are prefixed with $(CROSS_COMPILE).
 345 # CROSS_COMPILE can be set on the command line
 346 # make CROSS_COMPILE=ia64-linux-
 347 # Alternatively CROSS_COMPILE can be set in the environment.
 348 # Default value for CROSS_COMPILE is not to prefix executables
 349 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 350 ARCH            ?= $(SUBARCH)
 351
 352 # Architecture as present in compile.h
 353 UTS_MACHINE     := $(ARCH)
 354 SRCARCH         := $(ARCH)
 355
 356 # Additional ARCH settings for x86
 357 ifeq ($(ARCH),i386)
 358         SRCARCH := x86
 359 endif
 360 ifeq ($(ARCH),x86_64)
 361         SRCARCH := x86
 362 endif
 363
 364 # Additional ARCH settings for sparc
 365 ifeq ($(ARCH),sparc32)
 366        SRCARCH := sparc
 367 endif
 368 ifeq ($(ARCH),sparc64)
 369        SRCARCH := sparc
 370 endif
 371
 372 # Additional ARCH settings for sh
 373 ifeq ($(ARCH),sh64)
 374        SRCARCH := sh
 375 endif
 376
 377 KCONFIG_CONFIG  ?= .config
 378 export KCONFIG_CONFIG
 379
 380 # SHELL used by kbuild
 381 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 382           else if [ -x /bin/bash ]; then echo /bin/bash; \
 383           else echo sh; fi ; fi)
 384
 385 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 386 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 387 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 388
 389 HOSTCC       = gcc
 390 HOSTCXX      = g++
 391 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 392                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 393                 $(HOSTCFLAGS)
 394 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 395 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 396 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 397
 398 # Make variables (CC, etc...)
 399 AS              = $(CROSS_COMPILE)as
 400 LD              = $(CROSS_COMPILE)ld
 401 CC              = $(CROSS_COMPILE)gcc
 402 CPP             = $(CC) -E
 403 AR              = $(CROSS_COMPILE)ar
 404 NM              = $(CROSS_COMPILE)nm
 405 STRIP           = $(CROSS_COMPILE)strip
 406 OBJCOPY         = $(CROSS_COMPILE)objcopy
 407 OBJDUMP         = $(CROSS_COMPILE)objdump
 408 LEX             = flex
 409 YACC            = bison
 410 AWK             = awk
 411 GENKSYMS        = scripts/genksyms/genksyms
 412 INSTALLKERNEL  := installkernel
 413 DEPMOD          = /sbin/depmod
 414 PERL            = perl
 415 PYTHON          = python
 416 PYTHON2         = python2
 417 PYTHON3         = python3
 418 CHECK           = sparse
 419
 420 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 421                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 422 NOSTDINC_FLAGS  =
 423 CFLAGS_MODULE   =
 424 AFLAGS_MODULE   =
 425 LDFLAGS_MODULE  =
 426 CFLAGS_KERNEL   =
 427 AFLAGS_KERNEL   =
 428 LDFLAGS_vmlinux =
 429
 430 # Use USERINCLUDE when you must reference the UAPI directories only.
 431 USERINCLUDE    := \
 432                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 433                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 434                 -I$(srctree)/include/uapi \
 435                 -I$(objtree)/include/generated/uapi \
 436                 -include $(srctree)/include/linux/kconfig.h
 437
 438 # Use LINUXINCLUDE when you must reference the include/ directory.
 439 # Needed to be compatible with the O= option
 440 LINUXINCLUDE    := \
 441                 -I$(srctree)/arch/$(SRCARCH)/include \
 442                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 443                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 444                 -I$(objtree)/include \
 445                 $(USERINCLUDE)
 446
 447 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 448 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 449                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 450                    -Werror-implicit-function-declaration -Werror=implicit-int \
 451                    -Wno-format-security \
 452                    -std=gnu89
 453 KBUILD_CPPFLAGS := -D__KERNEL__
 454 KBUILD_AFLAGS_KERNEL :=
 455 KBUILD_CFLAGS_KERNEL :=
 456 KBUILD_AFLAGS_MODULE  := -DMODULE
 457 KBUILD_CFLAGS_MODULE  := -DMODULE
 458 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 459 KBUILD_LDFLAGS :=
 460 GCC_PLUGINS_CFLAGS :=
 461
 462 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 463 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 464 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 465 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 466
 467 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 468 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 469 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 470 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 471 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 472 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 473 export KBUILD_ARFLAGS
 474
 475 # When compiling out-of-tree modules, put MODVERDIR in the module
 476 # tree rather than in the kernel tree. The kernel tree might
 477 # even be read-only.
 478 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 479
 480 # Files to ignore in find ... statements
 481
 482 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 483                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 484                           -prune -o
 485 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 486                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 487
 488 # ===========================================================================
 489 # Rules shared between *config targets and build targets
 490
 491 # Basic helpers built in scripts/basic/
 492 PHONY += scripts_basic
 493 scripts_basic:
 494         $(Q)$(MAKE) $(build)=scripts/basic
 495         $(Q)rm -f .tmp_quiet_recordmcount
 496
 497 # To avoid any implicit rule to kick in, define an empty command.
 498 scripts/basic/%: scripts_basic ;
 499
 500 PHONY += outputmakefile
 501 # outputmakefile generates a Makefile in the output directory, if using a
 502 # separate output directory. This allows convenient use of make in the
 503 # output directory.
 504 outputmakefile:
 505 ifneq ($(KBUILD_SRC),)
 506         $(Q)ln -fsn $(srctree) source
 507         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 508 endif
 509
 510 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 511 ifneq ($(CROSS_COMPILE),)
 512 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 513 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
 514 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 515 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 516 endif
 517 ifneq ($(GCC_TOOLCHAIN),)
 518 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 519 endif
 520 CLANG_FLAGS     += -no-integrated-as
 521 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 522 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 523 export CLANG_FLAGS
 524 endif
 525
 526 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 527 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 528 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 529 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 530 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 531 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 532 export RETPOLINE_CFLAGS
 533 export RETPOLINE_VDSO_CFLAGS
 534
 535 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 536 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 537 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 538 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 539 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 540
 541 ifeq ($(config-targets),1)
 542 # ===========================================================================
 543 # *config targets only - make sure prerequisites are updated, and descend
 544 # in scripts/kconfig to make the *config target
 545
 546 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 547 # KBUILD_DEFCONFIG may point out an alternative default configuration
 548 # used for 'make defconfig'
 549 include arch/$(SRCARCH)/Makefile
 550 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 551
 552 config: scripts_basic outputmakefile FORCE
 553         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 554
 555 %config: scripts_basic outputmakefile FORCE
 556         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 557
 558 else
 559 # ===========================================================================
 560 # Build targets only - this includes vmlinux, arch specific targets, clean
 561 # targets and others. In general all targets except *config targets.
 562
 563 # If building an external module we do not care about the all: rule
 564 # but instead _all depend on modules
 565 PHONY += all
 566 ifeq ($(KBUILD_EXTMOD),)
 567 _all: all
 568 else
 569 _all: modules
 570 endif
 571
 572 # Decide whether to build built-in, modular, or both.
 573 # Normally, just do built-in.
 574
 575 KBUILD_MODULES :=
 576 KBUILD_BUILTIN := 1
 577
 578 # If we have only "make modules", don't compile built-in objects.
 579 # When we're building modules with modversions, we need to consider
 580 # the built-in objects during the descend as well, in order to
 581 # make sure the checksums are up to date before we record them.
 582
 583 ifeq ($(MAKECMDGOALS),modules)
 584   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 585 endif
 586
 587 # If we have "make <whatever> modules", compile modules
 588 # in addition to whatever we do anyway.
 589 # Just "make" or "make all" shall build modules as well
 590
 591 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 592   KBUILD_MODULES := 1
 593 endif
 594
 595 ifeq ($(MAKECMDGOALS),)
 596   KBUILD_MODULES := 1
 597 endif
 598
 599 export KBUILD_MODULES KBUILD_BUILTIN
 600
 601 ifeq ($(KBUILD_EXTMOD),)
 602 # Objects we will link into vmlinux / subdirs we need to visit
 603 init-y          := init/
 604 drivers-y       := drivers/ sound/ firmware/
 605 net-y           := net/
 606 libs-y          := lib/
 607 core-y          := usr/
 608 virt-y          := virt/
 609 endif # KBUILD_EXTMOD
 610
 611 ifeq ($(dot-config),1)
 612 include include/config/auto.conf
 613 endif
 614
 615 # The all: target is the default when no target is given on the
 616 # command line.
 617 # This allow a user to issue only 'make' to build a kernel including modules
 618 # Defaults to vmlinux, but the arch makefile usually adds further targets
 619 all: vmlinux
 620
 621 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 622         $(call cc-option,-fno-tree-loop-im) \
 623         $(call cc-disable-warning,maybe-uninitialized,)
 624 export CFLAGS_GCOV
 625
 626 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 627 ifdef CONFIG_FUNCTION_TRACER
 628   CC_FLAGS_FTRACE := -pg
 629 endif
 630
 631 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 632 # values of the respective KBUILD_* variables
 633 ARCH_CPPFLAGS :=
 634 ARCH_AFLAGS :=
 635 ARCH_CFLAGS :=
 636 include arch/$(SRCARCH)/Makefile
 637
 638 ifeq ($(dot-config),1)
 639 ifeq ($(may-sync-config),1)
 640 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 641 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 642 # because some architectures define CROSS_COMPILE there.
 643 -include include/config/auto.conf.cmd
 644
 645 # To avoid any implicit rule to kick in, define an empty command
 646 $(KCONFIG_CONFIG): ;
 647
 648 # The actual configuration files used during the build are stored in
 649 # include/generated/ and include/config/. Update them if .config is newer than
 650 # include/config/auto.conf (which mirrors .config).
 651 #
 652 # This exploits the 'multi-target pattern rule' trick.
 653 # The syncconfig should be executed only once to make all the targets.
 654 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 655         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 656 else
 657 # External modules and some install targets need include/generated/autoconf.h
 658 # and include/config/auto.conf but do not care if they are up-to-date.
 659 # Use auto.conf to trigger the test
 660 PHONY += include/config/auto.conf
 661
 662 include/config/auto.conf:
 663         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 664         echo >&2;                                                       \
 665         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 666         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 667         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 668         echo >&2 ;                                                      \
 669         /bin/false)
 670
 671 endif # may-sync-config
 672 endif # $(dot-config)
 673
 674 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 675 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 676 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 677 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 678 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 679
 680 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 681 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 682 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 683 else
 684 ifdef CONFIG_PROFILE_ALL_BRANCHES
 685 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 686 else
 687 KBUILD_CFLAGS   += -O2
 688 endif
 689 endif
 690
 691 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 692                         $(call cc-disable-warning,maybe-uninitialized,))
 693
 694 # Tell gcc to never replace conditional load with a non-conditional one
 695 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 696
 697 include scripts/Makefile.kcov
 698 include scripts/Makefile.gcc-plugins
 699
 700 ifdef CONFIG_READABLE_ASM
 701 # Disable optimizations that make assembler listings hard to read.
 702 # reorder blocks reorders the control in the function
 703 # ipa clone creates specialized cloned functions
 704 # partial inlining inlines only parts of functions
 705 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 706                  $(call cc-option,-fno-ipa-cp-clone,) \
 707                  $(call cc-option,-fno-partial-inlining)
 708 endif
 709
 710 ifneq ($(CONFIG_FRAME_WARN),0)
 711 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 712 endif
 713
 714 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 715 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 716 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 717
 718 KBUILD_CFLAGS += $(stackp-flags-y)
 719
 720 ifdef CONFIG_CC_IS_CLANG
 721 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 722 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 723 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 724 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 725 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 726 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 727 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 728 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 729 # See modpost pattern 2
 730 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 731 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 732 else
 733
 734 # These warnings generated too much noise in a regular build.
 735 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 736 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 737 endif
 738
 739 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 740 ifdef CONFIG_FRAME_POINTER
 741 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 742 else
 743 # Some targets (ARM with Thumb2, for example), can't be built with frame
 744 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 745 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 746 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 747 # -fomit-frame-pointer with FUNCTION_TRACER.
 748 ifndef CONFIG_FUNCTION_TRACER
 749 KBUILD_CFLAGS   += -fomit-frame-pointer
 750 endif
 751 endif
 752
 753 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 754
 755 ifdef CONFIG_DEBUG_INFO
 756 ifdef CONFIG_DEBUG_INFO_SPLIT
 757 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 758 else
 759 KBUILD_CFLAGS   += -g
 760 endif
 761 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 762 endif
 763 ifdef CONFIG_DEBUG_INFO_DWARF4
 764 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 765 endif
 766
 767 ifdef CONFIG_DEBUG_INFO_REDUCED
 768 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 769                    $(call cc-option,-fno-var-tracking)
 770 endif
 771
 772 ifdef CONFIG_FUNCTION_TRACER
 773 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 774   # gcc 5 supports generating the mcount tables directly
 775   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 776     CC_FLAGS_FTRACE     += -mrecord-mcount
 777     export CC_USING_RECORD_MCOUNT := 1
 778   endif
 779   ifdef CONFIG_HAVE_NOP_MCOUNT
 780     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 781       CC_FLAGS_FTRACE   += -mnop-mcount
 782       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 783     endif
 784   endif
 785 endif
 786 ifdef CONFIG_HAVE_FENTRY
 787   ifeq ($(call cc-option-yn, -mfentry),y)
 788     CC_FLAGS_FTRACE     += -mfentry
 789     CC_FLAGS_USING      += -DCC_USING_FENTRY
 790   endif
 791 endif
 792 export CC_FLAGS_FTRACE
 793 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 794 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 795 ifdef CONFIG_DYNAMIC_FTRACE
 796         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 797                 BUILD_C_RECORDMCOUNT := y
 798                 export BUILD_C_RECORDMCOUNT
 799         endif
 800 endif
 801 endif
 802
 803 # We trigger additional mismatches with less inlining
 804 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 805 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 806 endif
 807
 808 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 809 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 810 LDFLAGS_vmlinux += --gc-sections
 811 endif
 812
 813 # arch Makefile may override CC so keep this after arch Makefile is included
 814 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 815
 816 # warn about C99 declaration after statement
 817 KBUILD_CFLAGS += -Wdeclaration-after-statement
 818
 819 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 820 KBUILD_CFLAGS += $(call cc-option,-Wvla)
 821
 822 # disable pointer signed / unsigned warnings in gcc 4.0
 823 KBUILD_CFLAGS += -Wno-pointer-sign
 824
 825 # disable stringop warnings in gcc 8+
 826 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 827
 828 # disable invalid "can't wrap" optimizations for signed / pointers
 829 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 830
 831 # clang sets -fmerge-all-constants by default as optimization, but this
 832 # is non-conforming behavior for C and in fact breaks the kernel, so we
 833 # need to disable it here generally.
 834 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 835
 836 # for gcc -fno-merge-all-constants disables everything, but it is fine
 837 # to have actual conforming behavior enabled.
 838 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 839
 840 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 841 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 842
 843 # conserve stack if available
 844 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 845
 846 # Prohibit date/time macros, which would make the build non-deterministic
 847 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 848
 849 # enforce correct pointer usage
 850 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 851
 852 # Require designated initializers for all marked structures
 853 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 854
 855 # change __FILE__ to the relative path from the srctree
 856 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 857
 858 # use the deterministic mode of AR if available
 859 KBUILD_ARFLAGS := $(call ar-option,D)
 860
 861 include scripts/Makefile.kasan
 862 include scripts/Makefile.extrawarn
 863 include scripts/Makefile.ubsan
 864
 865 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 866 # last assignments
 867 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 868 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 869 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 870
 871 # Use --build-id when available.
 872 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 873 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 874 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 875
 876 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 877 LDFLAGS_vmlinux += $(call ld-option, -X,)
 878 endif
 879
 880 # insure the checker run with the right endianness
 881 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 882
 883 # the checker needs the correct machine size
 884 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 885
 886 # Default kernel image to build when no specific target is given.
 887 # KBUILD_IMAGE may be overruled on the command line or
 888 # set in the environment
 889 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 890 # this default value
 891 export KBUILD_IMAGE ?= vmlinux
 892
 893 #
 894 # INSTALL_PATH specifies where to place the updated kernel and system map
 895 # images. Default is /boot, but you can set it to other values
 896 export  INSTALL_PATH ?= /boot
 897
 898 #
 899 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 900 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 901 # an argument if needed. Otherwise it defaults to the kernel install path
 902 #
 903 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 904
 905 #
 906 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 907 # relocations required by build roots.  This is not defined in the
 908 # makefile but the argument can be passed to make if needed.
 909 #
 910
 911 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 912 export MODLIB
 913
 914 #
 915 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 916 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 917 # the default option --strip-debug will be used.  Otherwise,
 918 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 919
 920 ifdef INSTALL_MOD_STRIP
 921 ifeq ($(INSTALL_MOD_STRIP),1)
 922 mod_strip_cmd = $(STRIP) --strip-debug
 923 else
 924 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 925 endif # INSTALL_MOD_STRIP=1
 926 else
 927 mod_strip_cmd = true
 928 endif # INSTALL_MOD_STRIP
 929 export mod_strip_cmd
 930
 931 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 932 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 933 # or CONFIG_MODULE_COMPRESS_XZ.
 934
 935 mod_compress_cmd = true
 936 ifdef CONFIG_MODULE_COMPRESS
 937   ifdef CONFIG_MODULE_COMPRESS_GZIP
 938     mod_compress_cmd = gzip -n -f
 939   endif # CONFIG_MODULE_COMPRESS_GZIP
 940   ifdef CONFIG_MODULE_COMPRESS_XZ
 941     mod_compress_cmd = xz -f
 942   endif # CONFIG_MODULE_COMPRESS_XZ
 943 endif # CONFIG_MODULE_COMPRESS
 944 export mod_compress_cmd
 945
 946 # Select initial ramdisk compression format, default is gzip(1).
 947 # This shall be used by the dracut(8) tool while creating an initramfs image.
 948 #
 949 INITRD_COMPRESS-y                  := gzip
 950 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 951 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 952 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 953 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 954 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 955 # do not export INITRD_COMPRESS, since we didn't actually
 956 # choose a sane default compression above.
 957 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 958
 959 ifdef CONFIG_MODULE_SIG_ALL
 960 $(eval $(call config_filename,MODULE_SIG_KEY))
 961
 962 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 963 else
 964 mod_sign_cmd = true
 965 endif
 966 export mod_sign_cmd
 967
 968 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 969
 970 ifdef CONFIG_STACK_VALIDATION
 971   has_libelf := $(call try-run,\
 972                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 973   ifeq ($(has_libelf),1)
 974     objtool_target := tools/objtool FORCE
 975   else
 976     SKIP_STACK_VALIDATION := 1
 977     export SKIP_STACK_VALIDATION
 978   endif
 979 endif
 980
 981 PHONY += prepare0
 982
 983 ifeq ($(KBUILD_EXTMOD),)
 984 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 985
 986 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 987                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 988                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 989
 990 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 991                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 992
 993 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 994 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 995 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 996 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 997 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 998 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 999 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1000
1001 # Externally visible symbols (used by link-vmlinux.sh)
1002 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1003 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1004 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1005 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1006 export LDFLAGS_vmlinux
1007 # used by scripts/package/Makefile
1008 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1009
1010 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1011
1012 # Recurse until adjust_autoksyms.sh is satisfied
1013 PHONY += autoksyms_recursive
1014 autoksyms_recursive: $(vmlinux-deps)
1015 ifdef CONFIG_TRIM_UNUSED_KSYMS
1016         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1017           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1018 endif
1019
1020 # For the kernel to actually contain only the needed exported symbols,
1021 # we have to build modules as well to determine what those symbols are.
1022 # (this can be evaluated only once include/config/auto.conf has been included)
1023 ifdef CONFIG_TRIM_UNUSED_KSYMS
1024   KBUILD_MODULES := 1
1025 endif
1026
1027 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1028
1029 $(autoksyms_h):
1030         $(Q)mkdir -p $(dir $@)
1031         $(Q)touch $@
1032
1033 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1034
1035 # Final link of vmlinux with optional arch pass after final link
1036 cmd_link-vmlinux =                                                 \
1037         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1038         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1039
1040 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1041 ifdef CONFIG_GDB_SCRIPTS
1042         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1043 endif
1044         +$(call if_changed,link-vmlinux)
1045
1046 targets := vmlinux
1047
1048 # Build samples along the rest of the kernel. This needs headers_install.
1049 ifdef CONFIG_SAMPLES
1050 vmlinux-dirs += samples
1051 samples: headers_install
1052 endif
1053
1054 # The actual objects are generated when descending,
1055 # make sure no implicit rule kicks in
1056 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1057
1058 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1059 # Preset locale variables to speed up the build process. Limit locale
1060 # tweaks to this spot to avoid wrong language settings when running
1061 # make menuconfig etc.
1062 # Error messages still appears in the original language
1063
1064 PHONY += $(vmlinux-dirs)
1065 $(vmlinux-dirs): prepare
1066         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1067
1068 filechk_kernel.release = \
1069         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1070
1071 # Store (new) KERNELRELEASE string in include/config/kernel.release
1072 include/config/kernel.release: $(srctree)/Makefile FORCE
1073         $(call filechk,kernel.release)
1074
1075 # Additional helpers built in scripts/
1076 # Carefully list dependencies so we do not try to build scripts twice
1077 # in parallel
1078 PHONY += scripts
1079 scripts: scripts_basic scripts_dtc
1080         $(Q)$(MAKE) $(build)=$(@)
1081
1082 # Things we need to do before we recursively start building the kernel
1083 # or the modules are listed in "prepare".
1084 # A multi level approach is used. prepareN is processed before prepareN-1.
1085 # archprepare is used in arch Makefiles and when processed asm symlink,
1086 # version.h and scripts_basic is processed / created.
1087
1088 PHONY += prepare archprepare prepare1 prepare2 prepare3
1089
1090 # prepare3 is used to check if we are building in a separate output directory,
1091 # and if so do:
1092 # 1) Check that make has not been executed in the kernel src $(srctree)
1093 prepare3: include/config/kernel.release
1094 ifneq ($(KBUILD_SRC),)
1095         @$(kecho) '  Using $(srctree) as source for kernel'
1096         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1097                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1098                 echo >&2 "  in the '$(srctree)' directory.";\
1099                 /bin/false; \
1100         fi;
1101 endif
1102
1103 # prepare2 creates a makefile if using a separate output directory.
1104 # From this point forward, .config has been reprocessed, so any rules
1105 # that need to depend on updated CONFIG_* values can be checked here.
1106 prepare2: prepare3 outputmakefile asm-generic
1107
1108 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1109         $(cmd_crmodverdir)
1110
1111 archprepare: archheaders archscripts prepare1 scripts
1112
1113 prepare0: archprepare
1114         $(Q)$(MAKE) $(build)=scripts/mod
1115         $(Q)$(MAKE) $(build)=.
1116
1117 # All the preparing..
1118 prepare: prepare0 prepare-objtool
1119
1120 # Support for using generic headers in asm-generic
1121 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1122
1123 PHONY += asm-generic uapi-asm-generic
1124 asm-generic: uapi-asm-generic
1125         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm
1126 uapi-asm-generic:
1127         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm
1128
1129 PHONY += prepare-objtool
1130 prepare-objtool: $(objtool_target)
1131 ifeq ($(SKIP_STACK_VALIDATION),1)
1132 ifdef CONFIG_UNWINDER_ORC
1133         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1134         @false
1135 else
1136         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1137 endif
1138 endif
1139
1140 # Generate some files
1141 # ---------------------------------------------------------------------------
1142
1143 # KERNELRELEASE can change from a few different places, meaning version.h
1144 # needs to be updated, so this check is forced on all builds
1145
1146 uts_len := 64
1147 define filechk_utsrelease.h
1148         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1149           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1150           exit 1;                                                         \
1151         fi;                                                               \
1152         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1153 endef
1154
1155 define filechk_version.h
1156         echo \#define LINUX_VERSION_CODE $(shell                         \
1157         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1158         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1159 endef
1160
1161 $(version_h): FORCE
1162         $(call filechk,version.h)
1163         $(Q)rm -f $(old_version_h)
1164
1165 include/generated/utsrelease.h: include/config/kernel.release FORCE
1166         $(call filechk,utsrelease.h)
1167
1168 PHONY += headerdep
1169 headerdep:
1170         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1171         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1172
1173 # ---------------------------------------------------------------------------
1174 # Kernel headers
1175
1176 #Default location for installed headers
1177 export INSTALL_HDR_PATH = $(objtree)/usr
1178
1179 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1180 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1181
1182 PHONY += archheaders archscripts
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 dt_binding_check
1244 dtbs dtbs_check: prepare3 scripts_dtc
1245         $(Q)$(MAKE) $(build)=$(dtstree)
1246
1247 dtbs_check: export CHECK_DTBS=1
1248 dtbs_check: dt_binding_check
1249
1250 dtbs_install:
1251         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1252
1253 ifdef CONFIG_OF_EARLY_FLATTREE
1254 all: dtbs
1255 endif
1256
1257 endif
1258
1259 PHONY += scripts_dtc
1260 scripts_dtc: scripts_basic
1261         $(Q)$(MAKE) $(build)=scripts/dtc
1262
1263 dt_binding_check: scripts_dtc
1264         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1265
1266 # ---------------------------------------------------------------------------
1267 # Modules
1268
1269 ifdef CONFIG_MODULES
1270
1271 # By default, build modules as well
1272
1273 all: modules
1274
1275 # Build modules
1276 #
1277 # A module can be listed more than once in obj-m resulting in
1278 # duplicate lines in modules.order files.  Those are removed
1279 # using awk while concatenating to the final file.
1280
1281 PHONY += modules
1282 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1283         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1284         @$(kecho) '  Building modules, stage 2.';
1285         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1286
1287 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1288         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1289
1290 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1291         $(Q)$(MAKE) $(modbuiltin)=$*
1292
1293
1294 # Target to prepare building external modules
1295 PHONY += modules_prepare
1296 modules_prepare: prepare
1297
1298 # Target to install modules
1299 PHONY += modules_install
1300 modules_install: _modinst_ _modinst_post
1301
1302 PHONY += _modinst_
1303 _modinst_:
1304         @rm -rf $(MODLIB)/kernel
1305         @rm -f $(MODLIB)/source
1306         @mkdir -p $(MODLIB)/kernel
1307         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1308         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1309                 rm -f $(MODLIB)/build ; \
1310                 ln -s $(CURDIR) $(MODLIB)/build ; \
1311         fi
1312         @cp -f $(objtree)/modules.order $(MODLIB)/
1313         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1314         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1315
1316 # This depmod is only for convenience to give the initial
1317 # boot a modules.dep even before / is mounted read-write.  However the
1318 # boot script depmod is the master version.
1319 PHONY += _modinst_post
1320 _modinst_post: _modinst_
1321         $(call cmd,depmod)
1322
1323 ifeq ($(CONFIG_MODULE_SIG), y)
1324 PHONY += modules_sign
1325 modules_sign:
1326         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1327 endif
1328
1329 else # CONFIG_MODULES
1330
1331 # Modules not configured
1332 # ---------------------------------------------------------------------------
1333
1334 PHONY += modules modules_install
1335 modules modules_install:
1336         @echo >&2
1337         @echo >&2 "The present kernel configuration has modules disabled."
1338         @echo >&2 "Type 'make config' and enable loadable module support."
1339         @echo >&2 "Then build a kernel with module support enabled."
1340         @echo >&2
1341         @exit 1
1342
1343 endif # CONFIG_MODULES
1344
1345 ###
1346 # Cleaning is done on three levels.
1347 # make clean     Delete most generated files
1348 #                Leave enough to build external modules
1349 # make mrproper  Delete the current configuration, and all generated files
1350 # make distclean Remove editor backup files, patch leftover files and the like
1351
1352 # Directories & files removed with 'make clean'
1353 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1354
1355 # Directories & files removed with 'make mrproper'
1356 MRPROPER_DIRS  += include/config usr/include include/generated          \
1357                   arch/*/include/generated .tmp_objdiff
1358 MRPROPER_FILES += .config .config.old .version \
1359                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1360                   signing_key.pem signing_key.priv signing_key.x509     \
1361                   x509.genkey extra_certificates signing_key.x509.keyid \
1362                   signing_key.x509.signer vmlinux-gdb.py
1363
1364 # clean - Delete most, but leave enough to build external modules
1365 #
1366 clean: rm-dirs  := $(CLEAN_DIRS)
1367 clean: rm-files := $(CLEAN_FILES)
1368 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1369
1370 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1371 $(clean-dirs):
1372         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1373
1374 vmlinuxclean:
1375         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1376         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1377
1378 clean: archclean vmlinuxclean
1379
1380 # mrproper - Delete all generated files, including .config
1381 #
1382 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1383 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1384 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1385
1386 PHONY += $(mrproper-dirs) mrproper
1387 $(mrproper-dirs):
1388         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1389
1390 mrproper: clean $(mrproper-dirs)
1391         $(call cmd,rmdirs)
1392         $(call cmd,rmfiles)
1393
1394 # distclean
1395 #
1396 PHONY += distclean
1397
1398 distclean: mrproper
1399         @find $(srctree) $(RCS_FIND_IGNORE) \
1400                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1401                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1402                 -o -name 'core' \) \
1403                 -type f -print | xargs rm -f
1404
1405
1406 # Packaging of the kernel to various formats
1407 # ---------------------------------------------------------------------------
1408 package-dir     := scripts/package
1409
1410 %src-pkg: FORCE
1411         $(Q)$(MAKE) $(build)=$(package-dir) $@
1412 %pkg: include/config/kernel.release FORCE
1413         $(Q)$(MAKE) $(build)=$(package-dir) $@
1414
1415
1416 # Brief documentation of the typical targets used
1417 # ---------------------------------------------------------------------------
1418
1419 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1420 boards := $(sort $(notdir $(boards)))
1421 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1422 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1423
1424 PHONY += help
1425 help:
1426         @echo  'Cleaning targets:'
1427         @echo  '  clean           - Remove most generated files but keep the config and'
1428         @echo  '                    enough build support to build external modules'
1429         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1430         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1431         @echo  ''
1432         @echo  'Configuration targets:'
1433         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1434         @echo  ''
1435         @echo  'Other generic targets:'
1436         @echo  '  all             - Build all targets marked with [*]'
1437         @echo  '* vmlinux         - Build the bare kernel'
1438         @echo  '* modules         - Build all modules'
1439         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1440         @echo  '  dir/            - Build all files in dir and below'
1441         @echo  '  dir/file.[ois]  - Build specified target only'
1442         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1443         @echo  '                    (requires compiler support for LLVM assembly generation)'
1444         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1445         @echo  '                    (requires a recent binutils and recent build (System.map))'
1446         @echo  '  dir/file.ko     - Build module including final link'
1447         @echo  '  modules_prepare - Set up for building external modules'
1448         @echo  '  tags/TAGS       - Generate tags file for editors'
1449         @echo  '  cscope          - Generate cscope index'
1450         @echo  '  gtags           - Generate GNU GLOBAL index'
1451         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1452         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1453         @echo  '  image_name      - Output the image name (use with make -s)'
1454         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1455          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1456          echo  ''
1457         @echo  'Static analysers:'
1458         @echo  '  checkstack      - Generate a list of stack hogs'
1459         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1460         @echo  '  versioncheck    - Sanity check on version.h usage'
1461         @echo  '  includecheck    - Check for duplicate included header files'
1462         @echo  '  export_report   - List the usages of all exported symbols'
1463         @echo  '  headers_check   - Sanity check on exported headers'
1464         @echo  '  headerdep       - Detect inclusion cycles in headers'
1465         @echo  '  coccicheck      - Check with Coccinelle'
1466         @echo  ''
1467         @echo  'Kernel selftest:'
1468         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1469         @echo  '                    Build, install, and boot kernel before'
1470         @echo  '                    running kselftest on it'
1471         @echo  '  kselftest-clean - Remove all generated kselftest files'
1472         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1473         @echo  '                    .config.'
1474         @echo  ''
1475         @$(if $(dtstree), \
1476                 echo 'Devicetree:'; \
1477                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1478                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1479                 echo '')
1480
1481         @echo 'Userspace tools targets:'
1482         @echo '  use "make tools/help"'
1483         @echo '  or  "cd tools; make help"'
1484         @echo  ''
1485         @echo  'Kernel packaging:'
1486         @$(MAKE) $(build)=$(package-dir) help
1487         @echo  ''
1488         @echo  'Documentation targets:'
1489         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1490         @echo  ''
1491         @echo  'Architecture specific targets ($(SRCARCH)):'
1492         @$(if $(archhelp),$(archhelp),\
1493                 echo '  No architecture specific help defined for $(SRCARCH)')
1494         @echo  ''
1495         @$(if $(boards), \
1496                 $(foreach b, $(boards), \
1497                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1498                 echo '')
1499         @$(if $(board-dirs), \
1500                 $(foreach b, $(board-dirs), \
1501                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1502                 printf "  %-16s - Show all of the above\\n" help-boards; \
1503                 echo '')
1504
1505         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1506         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1507         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1508         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1509         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1510         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1511         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1512         @echo  '                1: warnings which may be relevant and do not occur too often'
1513         @echo  '                2: warnings which occur quite often but may still be relevant'
1514         @echo  '                3: more obscure warnings, can most likely be ignored'
1515         @echo  '                Multiple levels can be combined with W=12 or W=123'
1516         @echo  ''
1517         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1518         @echo  'For further info see the ./README file'
1519
1520
1521 help-board-dirs := $(addprefix help-,$(board-dirs))
1522
1523 help-boards: $(help-board-dirs)
1524
1525 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1526
1527 $(help-board-dirs): help-%:
1528         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1529         @$(if $(boards-per-dir), \
1530                 $(foreach b, $(boards-per-dir), \
1531                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1532                 echo '')
1533
1534
1535 # Documentation targets
1536 # ---------------------------------------------------------------------------
1537 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1538                linkcheckdocs dochelp refcheckdocs
1539 PHONY += $(DOC_TARGETS)
1540 $(DOC_TARGETS): scripts_basic FORCE
1541         $(Q)$(MAKE) $(build)=Documentation $@
1542
1543 else # KBUILD_EXTMOD
1544
1545 ###
1546 # External module support.
1547 # When building external modules the kernel used as basis is considered
1548 # read-only, and no consistency checks are made and the make
1549 # system is not used on the basis kernel. If updates are required
1550 # in the basis kernel ordinary make commands (without M=...) must
1551 # be used.
1552 #
1553 # The following are the only valid targets when building external
1554 # modules.
1555 # make M=dir clean     Delete all automatically generated files
1556 # make M=dir modules   Make all modules in specified dir
1557 # make M=dir           Same as 'make M=dir modules'
1558 # make M=dir modules_install
1559 #                      Install the modules built in the module directory
1560 #                      Assumes install directory is already created
1561
1562 # We are always building modules
1563 KBUILD_MODULES := 1
1564
1565 PHONY += $(objtree)/Module.symvers
1566 $(objtree)/Module.symvers:
1567         @test -e $(objtree)/Module.symvers || ( \
1568         echo; \
1569         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1570         echo "           is missing; modules will have no dependencies and modversions."; \
1571         echo )
1572
1573 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1574 PHONY += $(module-dirs) modules
1575 $(module-dirs): prepare $(objtree)/Module.symvers
1576         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1577
1578 modules: $(module-dirs)
1579         @$(kecho) '  Building modules, stage 2.';
1580         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1581
1582 PHONY += modules_install
1583 modules_install: _emodinst_ _emodinst_post
1584
1585 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1586 PHONY += _emodinst_
1587 _emodinst_:
1588         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1589         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1590
1591 PHONY += _emodinst_post
1592 _emodinst_post: _emodinst_
1593         $(call cmd,depmod)
1594
1595 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1596
1597 PHONY += $(clean-dirs) clean
1598 $(clean-dirs):
1599         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1600
1601 clean:  rm-dirs := $(MODVERDIR)
1602 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1603
1604 PHONY += help
1605 help:
1606         @echo  '  Building external modules.'
1607         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1608         @echo  ''
1609         @echo  '  modules         - default target, build the module(s)'
1610         @echo  '  modules_install - install the module'
1611         @echo  '  clean           - remove generated files in module directory only'
1612         @echo  ''
1613
1614 PHONY += prepare
1615 prepare:
1616         $(cmd_crmodverdir)
1617 endif # KBUILD_EXTMOD
1618
1619 clean: $(clean-dirs)
1620         $(call cmd,rmdirs)
1621         $(call cmd,rmfiles)
1622         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1623                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1624                 -o -name '*.ko.*' \
1625                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1626                 -o -name '*.dwo' -o -name '*.lst' \
1627                 -o -name '*.su'  \
1628                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1629                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1630                 -o -name '*.asn1.[ch]' \
1631                 -o -name '*.symtypes' -o -name 'modules.order' \
1632                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1633                 -o -name '*.c.[012]*.*' \
1634                 -o -name '*.ll' \
1635                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1636
1637 # Generate tags for editors
1638 # ---------------------------------------------------------------------------
1639 quiet_cmd_tags = GEN     $@
1640       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1641
1642 tags TAGS cscope gtags: FORCE
1643         $(call cmd,tags)
1644
1645 # Scripts to check various things for consistency
1646 # ---------------------------------------------------------------------------
1647
1648 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1649
1650 includecheck:
1651         find $(srctree)/* $(RCS_FIND_IGNORE) \
1652                 -name '*.[hcS]' -type f -print | sort \
1653                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1654
1655 versioncheck:
1656         find $(srctree)/* $(RCS_FIND_IGNORE) \
1657                 -name '*.[hcS]' -type f -print | sort \
1658                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1659
1660 coccicheck:
1661         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1662
1663 namespacecheck:
1664         $(PERL) $(srctree)/scripts/namespace.pl
1665
1666 export_report:
1667         $(PERL) $(srctree)/scripts/export_report.pl
1668
1669 PHONY += checkstack kernelrelease kernelversion image_name
1670
1671 # UML needs a little special treatment here.  It wants to use the host
1672 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1673 # else wants $(ARCH), including people doing cross-builds, which means
1674 # that $(SUBARCH) doesn't work here.
1675 ifeq ($(ARCH), um)
1676 CHECKSTACK_ARCH := $(SUBARCH)
1677 else
1678 CHECKSTACK_ARCH := $(ARCH)
1679 endif
1680 checkstack:
1681         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1682         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1683
1684 kernelrelease:
1685         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1686
1687 kernelversion:
1688         @echo $(KERNELVERSION)
1689
1690 image_name:
1691         @echo $(KBUILD_IMAGE)
1692
1693 # Clear a bunch of variables before executing the submake
1694 tools/: FORCE
1695         $(Q)mkdir -p $(objtree)/tools
1696         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1697
1698 tools/%: FORCE
1699         $(Q)mkdir -p $(objtree)/tools
1700         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1701
1702 # Single targets
1703 # ---------------------------------------------------------------------------
1704 # Single targets are compatible with:
1705 # - build with mixed source and output
1706 # - build with separate output dir 'make O=...'
1707 # - external modules
1708 #
1709 #  target-dir => where to store outputfile
1710 #  build-dir  => directory in kernel source tree to use
1711
1712 ifeq ($(KBUILD_EXTMOD),)
1713         build-dir  = $(patsubst %/,%,$(dir $@))
1714         target-dir = $(dir $@)
1715 else
1716         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1717         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1718         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1719 endif
1720
1721 %.s: %.c prepare FORCE
1722         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1723 %.i: %.c prepare FORCE
1724         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1725 %.o: %.c prepare FORCE
1726         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1727 %.lst: %.c prepare FORCE
1728         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1729 %.s: %.S prepare FORCE
1730         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1731 %.o: %.S prepare FORCE
1732         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1733 %.symtypes: %.c prepare FORCE
1734         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1735 %.ll: %.c prepare FORCE
1736         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1737
1738 # Modules
1739 /: prepare FORCE
1740         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1741         $(build)=$(build-dir)
1742 # Make sure the latest headers are built for Documentation
1743 Documentation/ samples/: headers_install
1744 %/: prepare FORCE
1745         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1746         $(build)=$(build-dir)
1747 %.ko: prepare FORCE
1748         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1749         $(build)=$(build-dir) $(@:.ko=.o)
1750         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1751
1752 # FIXME Should go into a make.lib or something
1753 # ===========================================================================
1754
1755 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1756       cmd_rmdirs = rm -rf $(rm-dirs)
1757
1758 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1759       cmd_rmfiles = rm -f $(rm-files)
1760
1761 # Run depmod only if we have System.map and depmod is executable
1762 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1763       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1764                    $(KERNELRELEASE)
1765
1766 # Create temporary dir for module support files
1767 # clean it up only when building all modules
1768 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1769                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1770
1771 # read saved command lines for existing targets
1772 existing-targets := $(wildcard $(sort $(targets)))
1773
1774 cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1775 $(cmd_files): ; # Do not try to update included dependency files
1776 -include $(cmd_files)
1777
1778 endif   # ifeq ($(config-targets),1)
1779 endif   # ifeq ($(mixed-targets),1)
1780 endif   # need-sub-make
1781
1782 PHONY += FORCE
1783 FORCE:
1784
1785 # Declare the contents of the PHONY variable as phony.  We keep that
1786 # information in a variable so we can use it in if_changed and friends.
1787 .PHONY: $(PHONY)