Makefile

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