Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 0
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc4
   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   $(warning ================= WARNING ================)
 190   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 191   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 192   $(warning ==========================================)
 193   KBUILD_EXTMOD ?= $(SUBDIRS)
 194 endif
 195
 196 ifeq ("$(origin M)", "command line")
 197   KBUILD_EXTMOD := $(M)
 198 endif
 199
 200 ifeq ($(KBUILD_SRC),)
 201         # building in the source tree
 202         srctree := .
 203 else
 204         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 205                 # building in a subdirectory of the source tree
 206                 srctree := ..
 207         else
 208                 srctree := $(KBUILD_SRC)
 209         endif
 210 endif
 211
 212 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 213
 214 objtree         := .
 215 src             := $(srctree)
 216 obj             := $(objtree)
 217
 218 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 219
 220 export srctree objtree VPATH
 221
 222 # To make sure we do not include .config for any of the *config targets
 223 # catch them early, and hand them over to scripts/kconfig/Makefile
 224 # It is allowed to specify more targets when calling make, including
 225 # mixing *config targets and build targets.
 226 # For example 'make oldconfig all'.
 227 # Detect when mixed targets is specified, and make a second invocation
 228 # of make so .config is not included in this case either (for *config).
 229
 230 version_h := include/generated/uapi/linux/version.h
 231 old_version_h := include/linux/version.h
 232
 233 clean-targets := %clean mrproper cleandocs
 234 no-dot-config-targets := $(clean-targets) \
 235                          cscope gtags TAGS tags help% %docs check% coccicheck \
 236                          $(version_h) headers_% archheaders archscripts \
 237                          %asm-generic kernelversion %src-pkg
 238 no-sync-config-targets := $(no-dot-config-targets) install %install \
 239                            kernelrelease
 240
 241 config-targets  := 0
 242 mixed-targets   := 0
 243 dot-config      := 1
 244 may-sync-config := 1
 245
 246 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 247         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 248                 dot-config := 0
 249         endif
 250 endif
 251
 252 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 253         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 254                 may-sync-config := 0
 255         endif
 256 endif
 257
 258 ifneq ($(KBUILD_EXTMOD),)
 259         may-sync-config := 0
 260 endif
 261
 262 ifeq ($(KBUILD_EXTMOD),)
 263         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 264                 config-targets := 1
 265                 ifneq ($(words $(MAKECMDGOALS)),1)
 266                         mixed-targets := 1
 267                 endif
 268         endif
 269 endif
 270
 271 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 272 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 273         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 274                 mixed-targets := 1
 275         endif
 276 endif
 277
 278 # install and modules_install need also be processed one by one
 279 ifneq ($(filter install,$(MAKECMDGOALS)),)
 280         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 281                 mixed-targets := 1
 282         endif
 283 endif
 284
 285 ifeq ($(mixed-targets),1)
 286 # ===========================================================================
 287 # We're called with mixed targets (*config and build targets).
 288 # Handle them one by one.
 289
 290 PHONY += $(MAKECMDGOALS) __build_one_by_one
 291
 292 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 293         @:
 294
 295 __build_one_by_one:
 296         $(Q)set -e; \
 297         for i in $(MAKECMDGOALS); do \
 298                 $(MAKE) -f $(srctree)/Makefile $$i; \
 299         done
 300
 301 else
 302
 303 # We need some generic definitions (do not try to remake the file).
 304 scripts/Kbuild.include: ;
 305 include scripts/Kbuild.include
 306
 307 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 308 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 309 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 310 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 311
 312 include scripts/subarch.include
 313
 314 # Cross compiling and selecting different set of gcc/bin-utils
 315 # ---------------------------------------------------------------------------
 316 #
 317 # When performing cross compilation for other architectures ARCH shall be set
 318 # to the target architecture. (See arch/* for the possibilities).
 319 # ARCH can be set during invocation of make:
 320 # make ARCH=ia64
 321 # Another way is to have ARCH set in the environment.
 322 # The default ARCH is the host where make is executed.
 323
 324 # CROSS_COMPILE specify the prefix used for all executables used
 325 # during compilation. Only gcc and related bin-utils executables
 326 # are prefixed with $(CROSS_COMPILE).
 327 # CROSS_COMPILE can be set on the command line
 328 # make CROSS_COMPILE=ia64-linux-
 329 # Alternatively CROSS_COMPILE can be set in the environment.
 330 # Default value for CROSS_COMPILE is not to prefix executables
 331 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 332 ARCH            ?= $(SUBARCH)
 333
 334 # Architecture as present in compile.h
 335 UTS_MACHINE     := $(ARCH)
 336 SRCARCH         := $(ARCH)
 337
 338 # Additional ARCH settings for x86
 339 ifeq ($(ARCH),i386)
 340         SRCARCH := x86
 341 endif
 342 ifeq ($(ARCH),x86_64)
 343         SRCARCH := x86
 344 endif
 345
 346 # Additional ARCH settings for sparc
 347 ifeq ($(ARCH),sparc32)
 348        SRCARCH := sparc
 349 endif
 350 ifeq ($(ARCH),sparc64)
 351        SRCARCH := sparc
 352 endif
 353
 354 # Additional ARCH settings for sh
 355 ifeq ($(ARCH),sh64)
 356        SRCARCH := sh
 357 endif
 358
 359 KCONFIG_CONFIG  ?= .config
 360 export KCONFIG_CONFIG
 361
 362 # SHELL used by kbuild
 363 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 364           else if [ -x /bin/bash ]; then echo /bin/bash; \
 365           else echo sh; fi ; fi)
 366
 367 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 368 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 369 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 370
 371 HOSTCC       = gcc
 372 HOSTCXX      = g++
 373 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 374                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 375                 $(HOSTCFLAGS)
 376 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 377 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 378 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 379
 380 # Make variables (CC, etc...)
 381 AS              = $(CROSS_COMPILE)as
 382 LD              = $(CROSS_COMPILE)ld
 383 CC              = $(CROSS_COMPILE)gcc
 384 CPP             = $(CC) -E
 385 AR              = $(CROSS_COMPILE)ar
 386 NM              = $(CROSS_COMPILE)nm
 387 STRIP           = $(CROSS_COMPILE)strip
 388 OBJCOPY         = $(CROSS_COMPILE)objcopy
 389 OBJDUMP         = $(CROSS_COMPILE)objdump
 390 LEX             = flex
 391 YACC            = bison
 392 AWK             = awk
 393 GENKSYMS        = scripts/genksyms/genksyms
 394 INSTALLKERNEL  := installkernel
 395 DEPMOD          = /sbin/depmod
 396 PERL            = perl
 397 PYTHON          = python
 398 PYTHON2         = python2
 399 PYTHON3         = python3
 400 CHECK           = sparse
 401
 402 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 403                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 404 NOSTDINC_FLAGS  =
 405 CFLAGS_MODULE   =
 406 AFLAGS_MODULE   =
 407 LDFLAGS_MODULE  =
 408 CFLAGS_KERNEL   =
 409 AFLAGS_KERNEL   =
 410 LDFLAGS_vmlinux =
 411
 412 # Use USERINCLUDE when you must reference the UAPI directories only.
 413 USERINCLUDE    := \
 414                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 415                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 416                 -I$(srctree)/include/uapi \
 417                 -I$(objtree)/include/generated/uapi \
 418                 -include $(srctree)/include/linux/kconfig.h
 419
 420 # Use LINUXINCLUDE when you must reference the include/ directory.
 421 # Needed to be compatible with the O= option
 422 LINUXINCLUDE    := \
 423                 -I$(srctree)/arch/$(SRCARCH)/include \
 424                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 425                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 426                 -I$(objtree)/include \
 427                 $(USERINCLUDE)
 428
 429 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 430 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 431                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 432                    -Werror-implicit-function-declaration -Werror=implicit-int \
 433                    -Wno-format-security \
 434                    -std=gnu89
 435 KBUILD_CPPFLAGS := -D__KERNEL__
 436 KBUILD_AFLAGS_KERNEL :=
 437 KBUILD_CFLAGS_KERNEL :=
 438 KBUILD_AFLAGS_MODULE  := -DMODULE
 439 KBUILD_CFLAGS_MODULE  := -DMODULE
 440 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 441 KBUILD_LDFLAGS :=
 442 GCC_PLUGINS_CFLAGS :=
 443
 444 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 445 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 446 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 447 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 448
 449 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 450 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 451 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 452 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 453 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 454 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 455 export KBUILD_ARFLAGS
 456
 457 # When compiling out-of-tree modules, put MODVERDIR in the module
 458 # tree rather than in the kernel tree. The kernel tree might
 459 # even be read-only.
 460 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 461
 462 # Files to ignore in find ... statements
 463
 464 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 465                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 466                           -prune -o
 467 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 468                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 469
 470 # ===========================================================================
 471 # Rules shared between *config targets and build targets
 472
 473 # Basic helpers built in scripts/basic/
 474 PHONY += scripts_basic
 475 scripts_basic:
 476         $(Q)$(MAKE) $(build)=scripts/basic
 477         $(Q)rm -f .tmp_quiet_recordmcount
 478
 479 # To avoid any implicit rule to kick in, define an empty command.
 480 scripts/basic/%: scripts_basic ;
 481
 482 PHONY += outputmakefile
 483 # outputmakefile generates a Makefile in the output directory, if using a
 484 # separate output directory. This allows convenient use of make in the
 485 # output directory.
 486 # At the same time when output Makefile generated, generate .gitignore to
 487 # ignore whole output directory
 488 outputmakefile:
 489 ifneq ($(KBUILD_SRC),)
 490         $(Q)ln -fsn $(srctree) source
 491         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 492         $(Q){ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 493 endif
 494
 495 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 496 ifneq ($(CROSS_COMPILE),)
 497 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
 498 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 499 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 500 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 501 endif
 502 ifneq ($(GCC_TOOLCHAIN),)
 503 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 504 endif
 505 CLANG_FLAGS     += -no-integrated-as
 506 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 507 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 508 export CLANG_FLAGS
 509 endif
 510
 511 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 512 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 513 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 514 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 515 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 516 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 517 export RETPOLINE_CFLAGS
 518 export RETPOLINE_VDSO_CFLAGS
 519
 520 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 521 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 522 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 523 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 524 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 525
 526 ifeq ($(config-targets),1)
 527 # ===========================================================================
 528 # *config targets only - make sure prerequisites are updated, and descend
 529 # in scripts/kconfig to make the *config target
 530
 531 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 532 # KBUILD_DEFCONFIG may point out an alternative default configuration
 533 # used for 'make defconfig'
 534 include arch/$(SRCARCH)/Makefile
 535 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 536
 537 config: scripts_basic outputmakefile FORCE
 538         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 539
 540 %config: scripts_basic outputmakefile FORCE
 541         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 542
 543 else
 544 # ===========================================================================
 545 # Build targets only - this includes vmlinux, arch specific targets, clean
 546 # targets and others. In general all targets except *config targets.
 547
 548 # If building an external module we do not care about the all: rule
 549 # but instead _all depend on modules
 550 PHONY += all
 551 ifeq ($(KBUILD_EXTMOD),)
 552 _all: all
 553 else
 554 _all: modules
 555 endif
 556
 557 # Decide whether to build built-in, modular, or both.
 558 # Normally, just do built-in.
 559
 560 KBUILD_MODULES :=
 561 KBUILD_BUILTIN := 1
 562
 563 # If we have only "make modules", don't compile built-in objects.
 564 # When we're building modules with modversions, we need to consider
 565 # the built-in objects during the descend as well, in order to
 566 # make sure the checksums are up to date before we record them.
 567
 568 ifeq ($(MAKECMDGOALS),modules)
 569   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 570 endif
 571
 572 # If we have "make <whatever> modules", compile modules
 573 # in addition to whatever we do anyway.
 574 # Just "make" or "make all" shall build modules as well
 575
 576 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 577   KBUILD_MODULES := 1
 578 endif
 579
 580 ifeq ($(MAKECMDGOALS),)
 581   KBUILD_MODULES := 1
 582 endif
 583
 584 export KBUILD_MODULES KBUILD_BUILTIN
 585
 586 ifeq ($(KBUILD_EXTMOD),)
 587 # Objects we will link into vmlinux / subdirs we need to visit
 588 init-y          := init/
 589 drivers-y       := drivers/ sound/ firmware/
 590 net-y           := net/
 591 libs-y          := lib/
 592 core-y          := usr/
 593 virt-y          := virt/
 594 endif # KBUILD_EXTMOD
 595
 596 ifeq ($(dot-config),1)
 597 include include/config/auto.conf
 598 endif
 599
 600 # The all: target is the default when no target is given on the
 601 # command line.
 602 # This allow a user to issue only 'make' to build a kernel including modules
 603 # Defaults to vmlinux, but the arch makefile usually adds further targets
 604 all: vmlinux
 605
 606 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 607         $(call cc-option,-fno-tree-loop-im) \
 608         $(call cc-disable-warning,maybe-uninitialized,)
 609 export CFLAGS_GCOV
 610
 611 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 612 ifdef CONFIG_FUNCTION_TRACER
 613   CC_FLAGS_FTRACE := -pg
 614 endif
 615
 616 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 617 # values of the respective KBUILD_* variables
 618 ARCH_CPPFLAGS :=
 619 ARCH_AFLAGS :=
 620 ARCH_CFLAGS :=
 621 include arch/$(SRCARCH)/Makefile
 622
 623 ifeq ($(dot-config),1)
 624 ifeq ($(may-sync-config),1)
 625 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 626 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 627 # because some architectures define CROSS_COMPILE there.
 628 -include include/config/auto.conf.cmd
 629
 630 # To avoid any implicit rule to kick in, define an empty command
 631 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 632
 633 # The actual configuration files used during the build are stored in
 634 # include/generated/ and include/config/. Update them if .config is newer than
 635 # include/config/auto.conf (which mirrors .config).
 636 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 637         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 638 else
 639 # External modules and some install targets need include/generated/autoconf.h
 640 # and include/config/auto.conf but do not care if they are up-to-date.
 641 # Use auto.conf to trigger the test
 642 PHONY += include/config/auto.conf
 643
 644 include/config/auto.conf:
 645         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 646         echo >&2;                                                       \
 647         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 648         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 649         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 650         echo >&2 ;                                                      \
 651         /bin/false)
 652
 653 endif # may-sync-config
 654 endif # $(dot-config)
 655
 656 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 657 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 658 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 659 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 660 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 661
 662 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 663 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 664 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 665 else
 666 ifdef CONFIG_PROFILE_ALL_BRANCHES
 667 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 668 else
 669 KBUILD_CFLAGS   += -O2
 670 endif
 671 endif
 672
 673 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 674                         $(call cc-disable-warning,maybe-uninitialized,))
 675
 676 # Tell gcc to never replace conditional load with a non-conditional one
 677 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 678
 679 include scripts/Makefile.kcov
 680 include scripts/Makefile.gcc-plugins
 681
 682 ifdef CONFIG_READABLE_ASM
 683 # Disable optimizations that make assembler listings hard to read.
 684 # reorder blocks reorders the control in the function
 685 # ipa clone creates specialized cloned functions
 686 # partial inlining inlines only parts of functions
 687 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 688                  $(call cc-option,-fno-ipa-cp-clone,) \
 689                  $(call cc-option,-fno-partial-inlining)
 690 endif
 691
 692 ifneq ($(CONFIG_FRAME_WARN),0)
 693 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 694 endif
 695
 696 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 697 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 698 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 699
 700 KBUILD_CFLAGS += $(stackp-flags-y)
 701
 702 ifdef CONFIG_CC_IS_CLANG
 703 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 704 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 705 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 706 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 707 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 708 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 709 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 710 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 711 # See modpost pattern 2
 712 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 713 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 714 else
 715
 716 # These warnings generated too much noise in a regular build.
 717 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 718 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 719 endif
 720
 721 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 722 ifdef CONFIG_FRAME_POINTER
 723 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 724 else
 725 # Some targets (ARM with Thumb2, for example), can't be built with frame
 726 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 727 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 728 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 729 # -fomit-frame-pointer with FUNCTION_TRACER.
 730 ifndef CONFIG_FUNCTION_TRACER
 731 KBUILD_CFLAGS   += -fomit-frame-pointer
 732 endif
 733 endif
 734
 735 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 736
 737 ifdef CONFIG_DEBUG_INFO
 738 ifdef CONFIG_DEBUG_INFO_SPLIT
 739 DEBUG_CFLAGS    += $(call cc-option, -gsplit-dwarf, -g)
 740 else
 741 DEBUG_CFLAGS    += -g
 742 endif
 743 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 744 endif
 745 ifdef CONFIG_DEBUG_INFO_DWARF4
 746 DEBUG_CFLAGS    += $(call cc-option, -gdwarf-4,)
 747 endif
 748
 749 ifdef CONFIG_DEBUG_INFO_REDUCED
 750 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 751                    $(call cc-option,-fno-var-tracking)
 752 endif
 753
 754 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 755 export DEBUG_CFLAGS
 756
 757 ifdef CONFIG_FUNCTION_TRACER
 758 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 759   # gcc 5 supports generating the mcount tables directly
 760   ifeq ($(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 # Prohibit date/time macros, which would make the build non-deterministic
 832 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 833
 834 # enforce correct pointer usage
 835 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 836
 837 # Require designated initializers for all marked structures
 838 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 839
 840 # change __FILE__ to the relative path from the srctree
 841 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 842
 843 # use the deterministic mode of AR if available
 844 KBUILD_ARFLAGS := $(call ar-option,D)
 845
 846 include scripts/Makefile.kasan
 847 include scripts/Makefile.extrawarn
 848 include scripts/Makefile.ubsan
 849
 850 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 851 # last assignments
 852 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 853 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 854 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 855
 856 # Use --build-id when available.
 857 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 858 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 859 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 860
 861 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 862 LDFLAGS_vmlinux += $(call ld-option, -X,)
 863 endif
 864
 865 # insure the checker run with the right endianness
 866 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 867
 868 # the checker needs the correct machine size
 869 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 870
 871 # Default kernel image to build when no specific target is given.
 872 # KBUILD_IMAGE may be overruled on the command line or
 873 # set in the environment
 874 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 875 # this default value
 876 export KBUILD_IMAGE ?= vmlinux
 877
 878 #
 879 # INSTALL_PATH specifies where to place the updated kernel and system map
 880 # images. Default is /boot, but you can set it to other values
 881 export  INSTALL_PATH ?= /boot
 882
 883 #
 884 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 885 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 886 # an argument if needed. Otherwise it defaults to the kernel install path
 887 #
 888 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 889
 890 #
 891 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 892 # relocations required by build roots.  This is not defined in the
 893 # makefile but the argument can be passed to make if needed.
 894 #
 895
 896 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 897 export MODLIB
 898
 899 #
 900 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 901 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 902 # the default option --strip-debug will be used.  Otherwise,
 903 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 904
 905 ifdef INSTALL_MOD_STRIP
 906 ifeq ($(INSTALL_MOD_STRIP),1)
 907 mod_strip_cmd = $(STRIP) --strip-debug
 908 else
 909 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 910 endif # INSTALL_MOD_STRIP=1
 911 else
 912 mod_strip_cmd = true
 913 endif # INSTALL_MOD_STRIP
 914 export mod_strip_cmd
 915
 916 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 917 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 918 # or CONFIG_MODULE_COMPRESS_XZ.
 919
 920 mod_compress_cmd = true
 921 ifdef CONFIG_MODULE_COMPRESS
 922   ifdef CONFIG_MODULE_COMPRESS_GZIP
 923     mod_compress_cmd = gzip -n -f
 924   endif # CONFIG_MODULE_COMPRESS_GZIP
 925   ifdef CONFIG_MODULE_COMPRESS_XZ
 926     mod_compress_cmd = xz -f
 927   endif # CONFIG_MODULE_COMPRESS_XZ
 928 endif # CONFIG_MODULE_COMPRESS
 929 export mod_compress_cmd
 930
 931 # Select initial ramdisk compression format, default is gzip(1).
 932 # This shall be used by the dracut(8) tool while creating an initramfs image.
 933 #
 934 INITRD_COMPRESS-y                  := gzip
 935 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 936 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 937 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 938 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 939 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 940 # do not export INITRD_COMPRESS, since we didn't actually
 941 # choose a sane default compression above.
 942 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 943
 944 ifdef CONFIG_MODULE_SIG_ALL
 945 $(eval $(call config_filename,MODULE_SIG_KEY))
 946
 947 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 948 else
 949 mod_sign_cmd = true
 950 endif
 951 export mod_sign_cmd
 952
 953 ifdef CONFIG_STACK_VALIDATION
 954   has_libelf := $(call try-run,\
 955                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 956   ifeq ($(has_libelf),1)
 957     objtool_target := tools/objtool FORCE
 958   else
 959     SKIP_STACK_VALIDATION := 1
 960     export SKIP_STACK_VALIDATION
 961   endif
 962 endif
 963
 964 PHONY += prepare0
 965
 966 ifeq ($(KBUILD_EXTMOD),)
 967 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 968
 969 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 970                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 971                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 972
 973 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 974                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 975
 976 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 977 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 978 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 979 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 980 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 981 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 982 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 983
 984 # Externally visible symbols (used by link-vmlinux.sh)
 985 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
 986                               $(drivers-y) $(net-y) $(virt-y)
 987 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 988 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 989 export LDFLAGS_vmlinux
 990 # used by scripts/package/Makefile
 991 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 992
 993 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
 994
 995 # Recurse until adjust_autoksyms.sh is satisfied
 996 PHONY += autoksyms_recursive
 997 autoksyms_recursive: $(vmlinux-deps)
 998 ifdef CONFIG_TRIM_UNUSED_KSYMS
 999         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1000           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1001 endif
1002
1003 # For the kernel to actually contain only the needed exported symbols,
1004 # we have to build modules as well to determine what those symbols are.
1005 # (this can be evaluated only once include/config/auto.conf has been included)
1006 ifdef CONFIG_TRIM_UNUSED_KSYMS
1007   KBUILD_MODULES := 1
1008 endif
1009
1010 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1011
1012 $(autoksyms_h):
1013         $(Q)mkdir -p $(dir $@)
1014         $(Q)touch $@
1015
1016 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1017
1018 # Final link of vmlinux with optional arch pass after final link
1019 cmd_link-vmlinux =                                                 \
1020         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1021         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1022
1023 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1024 ifdef CONFIG_GDB_SCRIPTS
1025         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1026 endif
1027         +$(call if_changed,link-vmlinux)
1028
1029 targets := vmlinux
1030
1031 # Build samples along the rest of the kernel. This needs headers_install.
1032 ifdef CONFIG_SAMPLES
1033 vmlinux-dirs += samples
1034 samples: headers_install
1035 endif
1036
1037 # The actual objects are generated when descending,
1038 # make sure no implicit rule kicks in
1039 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1040
1041 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1042 # Preset locale variables to speed up the build process. Limit locale
1043 # tweaks to this spot to avoid wrong language settings when running
1044 # make menuconfig etc.
1045 # Error messages still appears in the original language
1046
1047 PHONY += $(vmlinux-dirs)
1048 $(vmlinux-dirs): prepare
1049         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1050
1051 filechk_kernel.release = \
1052         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1053
1054 # Store (new) KERNELRELEASE string in include/config/kernel.release
1055 include/config/kernel.release: $(srctree)/Makefile FORCE
1056         $(call filechk,kernel.release)
1057
1058 # Additional helpers built in scripts/
1059 # Carefully list dependencies so we do not try to build scripts twice
1060 # in parallel
1061 PHONY += scripts
1062 scripts: scripts_basic scripts_dtc
1063         $(Q)$(MAKE) $(build)=$(@)
1064
1065 # Things we need to do before we recursively start building the kernel
1066 # or the modules are listed in "prepare".
1067 # A multi level approach is used. prepareN is processed before prepareN-1.
1068 # archprepare is used in arch Makefiles and when processed asm symlink,
1069 # version.h and scripts_basic is processed / created.
1070
1071 PHONY += prepare archprepare prepare1 prepare3
1072
1073 # prepare3 is used to check if we are building in a separate output directory,
1074 # and if so do:
1075 # 1) Check that make has not been executed in the kernel src $(srctree)
1076 prepare3: include/config/kernel.release
1077 ifneq ($(KBUILD_SRC),)
1078         @$(kecho) '  Using $(srctree) as source for kernel'
1079         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1080                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1081                 echo >&2 "  in the '$(srctree)' directory.";\
1082                 /bin/false; \
1083         fi;
1084 endif
1085
1086 prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1087                                                 include/generated/utsrelease.h
1088         $(cmd_crmodverdir)
1089
1090 archprepare: archheaders archscripts prepare1 scripts
1091
1092 prepare0: archprepare
1093         $(Q)$(MAKE) $(build)=scripts/mod
1094         $(Q)$(MAKE) $(build)=.
1095
1096 # All the preparing..
1097 prepare: prepare0 prepare-objtool
1098
1099 # Support for using generic headers in asm-generic
1100 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1101
1102 PHONY += asm-generic uapi-asm-generic
1103 asm-generic: uapi-asm-generic
1104         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm
1105 uapi-asm-generic:
1106         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm
1107
1108 PHONY += prepare-objtool
1109 prepare-objtool: $(objtool_target)
1110 ifeq ($(SKIP_STACK_VALIDATION),1)
1111 ifdef CONFIG_UNWINDER_ORC
1112         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1113         @false
1114 else
1115         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1116 endif
1117 endif
1118
1119 # Generate some files
1120 # ---------------------------------------------------------------------------
1121
1122 # KERNELRELEASE can change from a few different places, meaning version.h
1123 # needs to be updated, so this check is forced on all builds
1124
1125 uts_len := 64
1126 define filechk_utsrelease.h
1127         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1128           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1129           exit 1;                                                         \
1130         fi;                                                               \
1131         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1132 endef
1133
1134 define filechk_version.h
1135         echo \#define LINUX_VERSION_CODE $(shell                         \
1136         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1137         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1138 endef
1139
1140 $(version_h): FORCE
1141         $(call filechk,version.h)
1142         $(Q)rm -f $(old_version_h)
1143
1144 include/generated/utsrelease.h: include/config/kernel.release FORCE
1145         $(call filechk,utsrelease.h)
1146
1147 PHONY += headerdep
1148 headerdep:
1149         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1150         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1151
1152 # ---------------------------------------------------------------------------
1153 # Kernel headers
1154
1155 #Default location for installed headers
1156 export INSTALL_HDR_PATH = $(objtree)/usr
1157
1158 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1159 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1160
1161 PHONY += archheaders archscripts
1162
1163 PHONY += __headers
1164 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1165         $(Q)$(MAKE) $(build)=scripts build_unifdef
1166
1167 PHONY += headers_install_all
1168 headers_install_all:
1169         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1170
1171 PHONY += headers_install
1172 headers_install: __headers
1173         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1174           $(error Headers not exportable for the $(SRCARCH) architecture))
1175         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1176         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1177
1178 PHONY += headers_check_all
1179 headers_check_all: headers_install_all
1180         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1181
1182 PHONY += headers_check
1183 headers_check: headers_install
1184         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1185         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1186
1187 ifdef CONFIG_HEADERS_CHECK
1188 all: headers_check
1189 endif
1190
1191 # ---------------------------------------------------------------------------
1192 # Kernel selftest
1193
1194 PHONY += kselftest
1195 kselftest:
1196         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1197
1198 PHONY += kselftest-clean
1199 kselftest-clean:
1200         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1201
1202 PHONY += kselftest-merge
1203 kselftest-merge:
1204         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1205         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1206                 -m $(objtree)/.config \
1207                 $(srctree)/tools/testing/selftests/*/config
1208         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1209
1210 # ---------------------------------------------------------------------------
1211 # Devicetree files
1212
1213 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1214 dtstree := arch/$(SRCARCH)/boot/dts
1215 endif
1216
1217 ifneq ($(dtstree),)
1218
1219 %.dtb: prepare3 scripts_dtc
1220         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1221
1222 PHONY += dtbs dtbs_install dt_binding_check
1223 dtbs dtbs_check: prepare3 scripts_dtc
1224         $(Q)$(MAKE) $(build)=$(dtstree)
1225
1226 dtbs_check: export CHECK_DTBS=1
1227 dtbs_check: dt_binding_check
1228
1229 dtbs_install:
1230         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1231
1232 ifdef CONFIG_OF_EARLY_FLATTREE
1233 all: dtbs
1234 endif
1235
1236 endif
1237
1238 PHONY += scripts_dtc
1239 scripts_dtc: scripts_basic
1240         $(Q)$(MAKE) $(build)=scripts/dtc
1241
1242 dt_binding_check: scripts_dtc
1243         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1244
1245 # ---------------------------------------------------------------------------
1246 # Modules
1247
1248 ifdef CONFIG_MODULES
1249
1250 # By default, build modules as well
1251
1252 all: modules
1253
1254 # Build modules
1255 #
1256 # A module can be listed more than once in obj-m resulting in
1257 # duplicate lines in modules.order files.  Those are removed
1258 # using awk while concatenating to the final file.
1259
1260 PHONY += modules
1261 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1262         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1263         @$(kecho) '  Building modules, stage 2.';
1264         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1265
1266 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1267         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1268
1269 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1270         $(Q)$(MAKE) $(modbuiltin)=$*
1271
1272
1273 # Target to prepare building external modules
1274 PHONY += modules_prepare
1275 modules_prepare: prepare
1276
1277 # Target to install modules
1278 PHONY += modules_install
1279 modules_install: _modinst_ _modinst_post
1280
1281 PHONY += _modinst_
1282 _modinst_:
1283         @rm -rf $(MODLIB)/kernel
1284         @rm -f $(MODLIB)/source
1285         @mkdir -p $(MODLIB)/kernel
1286         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1287         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1288                 rm -f $(MODLIB)/build ; \
1289                 ln -s $(CURDIR) $(MODLIB)/build ; \
1290         fi
1291         @cp -f $(objtree)/modules.order $(MODLIB)/
1292         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1293         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1294
1295 # This depmod is only for convenience to give the initial
1296 # boot a modules.dep even before / is mounted read-write.  However the
1297 # boot script depmod is the master version.
1298 PHONY += _modinst_post
1299 _modinst_post: _modinst_
1300         $(call cmd,depmod)
1301
1302 ifeq ($(CONFIG_MODULE_SIG), y)
1303 PHONY += modules_sign
1304 modules_sign:
1305         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1306 endif
1307
1308 else # CONFIG_MODULES
1309
1310 # Modules not configured
1311 # ---------------------------------------------------------------------------
1312
1313 PHONY += modules modules_install
1314 modules modules_install:
1315         @echo >&2
1316         @echo >&2 "The present kernel configuration has modules disabled."
1317         @echo >&2 "Type 'make config' and enable loadable module support."
1318         @echo >&2 "Then build a kernel with module support enabled."
1319         @echo >&2
1320         @exit 1
1321
1322 endif # CONFIG_MODULES
1323
1324 ###
1325 # Cleaning is done on three levels.
1326 # make clean     Delete most generated files
1327 #                Leave enough to build external modules
1328 # make mrproper  Delete the current configuration, and all generated files
1329 # make distclean Remove editor backup files, patch leftover files and the like
1330
1331 # Directories & files removed with 'make clean'
1332 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1333
1334 # Directories & files removed with 'make mrproper'
1335 MRPROPER_DIRS  += include/config usr/include include/generated          \
1336                   arch/*/include/generated .tmp_objdiff
1337 MRPROPER_FILES += .config .config.old .version \
1338                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1339                   signing_key.pem signing_key.priv signing_key.x509     \
1340                   x509.genkey extra_certificates signing_key.x509.keyid \
1341                   signing_key.x509.signer vmlinux-gdb.py
1342
1343 # clean - Delete most, but leave enough to build external modules
1344 #
1345 clean: rm-dirs  := $(CLEAN_DIRS)
1346 clean: rm-files := $(CLEAN_FILES)
1347 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1348
1349 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1350 $(clean-dirs):
1351         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1352
1353 vmlinuxclean:
1354         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1355         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1356
1357 clean: archclean vmlinuxclean
1358
1359 # mrproper - Delete all generated files, including .config
1360 #
1361 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1362 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1363 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1364
1365 PHONY += $(mrproper-dirs) mrproper
1366 $(mrproper-dirs):
1367         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1368
1369 mrproper: clean $(mrproper-dirs)
1370         $(call cmd,rmdirs)
1371         $(call cmd,rmfiles)
1372
1373 # distclean
1374 #
1375 PHONY += distclean
1376
1377 distclean: mrproper
1378         @find $(srctree) $(RCS_FIND_IGNORE) \
1379                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1380                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1381                 -o -name 'core' \) \
1382                 -type f -print | xargs rm -f
1383
1384
1385 # Packaging of the kernel to various formats
1386 # ---------------------------------------------------------------------------
1387 package-dir     := scripts/package
1388
1389 %src-pkg: FORCE
1390         $(Q)$(MAKE) $(build)=$(package-dir) $@
1391 %pkg: include/config/kernel.release FORCE
1392         $(Q)$(MAKE) $(build)=$(package-dir) $@
1393
1394
1395 # Brief documentation of the typical targets used
1396 # ---------------------------------------------------------------------------
1397
1398 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1399 boards := $(sort $(notdir $(boards)))
1400 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1401 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1402
1403 PHONY += help
1404 help:
1405         @echo  'Cleaning targets:'
1406         @echo  '  clean           - Remove most generated files but keep the config and'
1407         @echo  '                    enough build support to build external modules'
1408         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1409         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1410         @echo  ''
1411         @echo  'Configuration targets:'
1412         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1413         @echo  ''
1414         @echo  'Other generic targets:'
1415         @echo  '  all             - Build all targets marked with [*]'
1416         @echo  '* vmlinux         - Build the bare kernel'
1417         @echo  '* modules         - Build all modules'
1418         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1419         @echo  '  dir/            - Build all files in dir and below'
1420         @echo  '  dir/file.[ois]  - Build specified target only'
1421         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1422         @echo  '                    (requires compiler support for LLVM assembly generation)'
1423         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1424         @echo  '                    (requires a recent binutils and recent build (System.map))'
1425         @echo  '  dir/file.ko     - Build module including final link'
1426         @echo  '  modules_prepare - Set up for building external modules'
1427         @echo  '  tags/TAGS       - Generate tags file for editors'
1428         @echo  '  cscope          - Generate cscope index'
1429         @echo  '  gtags           - Generate GNU GLOBAL index'
1430         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1431         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1432         @echo  '  image_name      - Output the image name (use with make -s)'
1433         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1434          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1435          echo  ''
1436         @echo  'Static analysers:'
1437         @echo  '  checkstack      - Generate a list of stack hogs'
1438         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1439         @echo  '  versioncheck    - Sanity check on version.h usage'
1440         @echo  '  includecheck    - Check for duplicate included header files'
1441         @echo  '  export_report   - List the usages of all exported symbols'
1442         @echo  '  headers_check   - Sanity check on exported headers'
1443         @echo  '  headerdep       - Detect inclusion cycles in headers'
1444         @echo  '  coccicheck      - Check with Coccinelle'
1445         @echo  ''
1446         @echo  'Kernel selftest:'
1447         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1448         @echo  '                    Build, install, and boot kernel before'
1449         @echo  '                    running kselftest on it'
1450         @echo  '  kselftest-clean - Remove all generated kselftest files'
1451         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1452         @echo  '                    .config.'
1453         @echo  ''
1454         @$(if $(dtstree), \
1455                 echo 'Devicetree:'; \
1456                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1457                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1458                 echo '')
1459
1460         @echo 'Userspace tools targets:'
1461         @echo '  use "make tools/help"'
1462         @echo '  or  "cd tools; make help"'
1463         @echo  ''
1464         @echo  'Kernel packaging:'
1465         @$(MAKE) $(build)=$(package-dir) help
1466         @echo  ''
1467         @echo  'Documentation targets:'
1468         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1469         @echo  ''
1470         @echo  'Architecture specific targets ($(SRCARCH)):'
1471         @$(if $(archhelp),$(archhelp),\
1472                 echo '  No architecture specific help defined for $(SRCARCH)')
1473         @echo  ''
1474         @$(if $(boards), \
1475                 $(foreach b, $(boards), \
1476                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1477                 echo '')
1478         @$(if $(board-dirs), \
1479                 $(foreach b, $(board-dirs), \
1480                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1481                 printf "  %-16s - Show all of the above\\n" help-boards; \
1482                 echo '')
1483
1484         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1485         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1486         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1487         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1488         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1489         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1490         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1491         @echo  '                1: warnings which may be relevant and do not occur too often'
1492         @echo  '                2: warnings which occur quite often but may still be relevant'
1493         @echo  '                3: more obscure warnings, can most likely be ignored'
1494         @echo  '                Multiple levels can be combined with W=12 or W=123'
1495         @echo  ''
1496         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1497         @echo  'For further info see the ./README file'
1498
1499
1500 help-board-dirs := $(addprefix help-,$(board-dirs))
1501
1502 help-boards: $(help-board-dirs)
1503
1504 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1505
1506 $(help-board-dirs): help-%:
1507         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1508         @$(if $(boards-per-dir), \
1509                 $(foreach b, $(boards-per-dir), \
1510                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1511                 echo '')
1512
1513
1514 # Documentation targets
1515 # ---------------------------------------------------------------------------
1516 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1517                linkcheckdocs dochelp refcheckdocs
1518 PHONY += $(DOC_TARGETS)
1519 $(DOC_TARGETS): scripts_basic FORCE
1520         $(Q)$(MAKE) $(build)=Documentation $@
1521
1522 else # KBUILD_EXTMOD
1523
1524 ###
1525 # External module support.
1526 # When building external modules the kernel used as basis is considered
1527 # read-only, and no consistency checks are made and the make
1528 # system is not used on the basis kernel. If updates are required
1529 # in the basis kernel ordinary make commands (without M=...) must
1530 # be used.
1531 #
1532 # The following are the only valid targets when building external
1533 # modules.
1534 # make M=dir clean     Delete all automatically generated files
1535 # make M=dir modules   Make all modules in specified dir
1536 # make M=dir           Same as 'make M=dir modules'
1537 # make M=dir modules_install
1538 #                      Install the modules built in the module directory
1539 #                      Assumes install directory is already created
1540
1541 # We are always building modules
1542 KBUILD_MODULES := 1
1543
1544 PHONY += $(objtree)/Module.symvers
1545 $(objtree)/Module.symvers:
1546         @test -e $(objtree)/Module.symvers || ( \
1547         echo; \
1548         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1549         echo "           is missing; modules will have no dependencies and modversions."; \
1550         echo )
1551
1552 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1553 PHONY += $(module-dirs) modules
1554 $(module-dirs): prepare $(objtree)/Module.symvers
1555         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1556
1557 modules: $(module-dirs)
1558         @$(kecho) '  Building modules, stage 2.';
1559         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1560
1561 PHONY += modules_install
1562 modules_install: _emodinst_ _emodinst_post
1563
1564 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1565 PHONY += _emodinst_
1566 _emodinst_:
1567         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1568         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1569
1570 PHONY += _emodinst_post
1571 _emodinst_post: _emodinst_
1572         $(call cmd,depmod)
1573
1574 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1575
1576 PHONY += $(clean-dirs) clean
1577 $(clean-dirs):
1578         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1579
1580 clean:  rm-dirs := $(MODVERDIR)
1581 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1582
1583 PHONY += help
1584 help:
1585         @echo  '  Building external modules.'
1586         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1587         @echo  ''
1588         @echo  '  modules         - default target, build the module(s)'
1589         @echo  '  modules_install - install the module'
1590         @echo  '  clean           - remove generated files in module directory only'
1591         @echo  ''
1592
1593 PHONY += prepare
1594 prepare:
1595         $(cmd_crmodverdir)
1596 endif # KBUILD_EXTMOD
1597
1598 clean: $(clean-dirs)
1599         $(call cmd,rmdirs)
1600         $(call cmd,rmfiles)
1601         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1602                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1603                 -o -name '*.ko.*' \
1604                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1605                 -o -name '*.dwo' -o -name '*.lst' \
1606                 -o -name '*.su'  \
1607                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1608                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1609                 -o -name '*.asn1.[ch]' \
1610                 -o -name '*.symtypes' -o -name 'modules.order' \
1611                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1612                 -o -name '*.c.[012]*.*' \
1613                 -o -name '*.ll' \
1614                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1615
1616 # Generate tags for editors
1617 # ---------------------------------------------------------------------------
1618 quiet_cmd_tags = GEN     $@
1619       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1620
1621 tags TAGS cscope gtags: FORCE
1622         $(call cmd,tags)
1623
1624 # Scripts to check various things for consistency
1625 # ---------------------------------------------------------------------------
1626
1627 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1628
1629 includecheck:
1630         find $(srctree)/* $(RCS_FIND_IGNORE) \
1631                 -name '*.[hcS]' -type f -print | sort \
1632                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1633
1634 versioncheck:
1635         find $(srctree)/* $(RCS_FIND_IGNORE) \
1636                 -name '*.[hcS]' -type f -print | sort \
1637                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1638
1639 coccicheck:
1640         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1641
1642 namespacecheck:
1643         $(PERL) $(srctree)/scripts/namespace.pl
1644
1645 export_report:
1646         $(PERL) $(srctree)/scripts/export_report.pl
1647
1648 PHONY += checkstack kernelrelease kernelversion image_name
1649
1650 # UML needs a little special treatment here.  It wants to use the host
1651 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1652 # else wants $(ARCH), including people doing cross-builds, which means
1653 # that $(SUBARCH) doesn't work here.
1654 ifeq ($(ARCH), um)
1655 CHECKSTACK_ARCH := $(SUBARCH)
1656 else
1657 CHECKSTACK_ARCH := $(ARCH)
1658 endif
1659 checkstack:
1660         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1661         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1662
1663 kernelrelease:
1664         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1665
1666 kernelversion:
1667         @echo $(KERNELVERSION)
1668
1669 image_name:
1670         @echo $(KBUILD_IMAGE)
1671
1672 # Clear a bunch of variables before executing the submake
1673 tools/: FORCE
1674         $(Q)mkdir -p $(objtree)/tools
1675         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1676
1677 tools/%: FORCE
1678         $(Q)mkdir -p $(objtree)/tools
1679         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1680
1681 # Single targets
1682 # ---------------------------------------------------------------------------
1683 # Single targets are compatible with:
1684 # - build with mixed source and output
1685 # - build with separate output dir 'make O=...'
1686 # - external modules
1687 #
1688 #  target-dir => where to store outputfile
1689 #  build-dir  => directory in kernel source tree to use
1690
1691 ifeq ($(KBUILD_EXTMOD),)
1692         build-dir  = $(patsubst %/,%,$(dir $@))
1693         target-dir = $(dir $@)
1694 else
1695         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1696         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1697         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1698 endif
1699
1700 %.s: %.c prepare FORCE
1701         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1702 %.i: %.c prepare FORCE
1703         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1704 %.o: %.c prepare FORCE
1705         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1706 %.lst: %.c prepare FORCE
1707         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1708 %.s: %.S prepare FORCE
1709         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1710 %.o: %.S prepare FORCE
1711         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712 %.symtypes: %.c prepare FORCE
1713         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714 %.ll: %.c prepare FORCE
1715         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716
1717 # Modules
1718 /: prepare FORCE
1719         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1720         $(build)=$(build-dir)
1721 # Make sure the latest headers are built for Documentation
1722 Documentation/ samples/: headers_install
1723 %/: prepare FORCE
1724         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1725         $(build)=$(build-dir)
1726 %.ko: prepare FORCE
1727         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1728         $(build)=$(build-dir) $(@:.ko=.o)
1729         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1730
1731 # FIXME Should go into a make.lib or something
1732 # ===========================================================================
1733
1734 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1735       cmd_rmdirs = rm -rf $(rm-dirs)
1736
1737 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1738       cmd_rmfiles = rm -f $(rm-files)
1739
1740 # Run depmod only if we have System.map and depmod is executable
1741 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1742       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1743                    $(KERNELRELEASE)
1744
1745 # Create temporary dir for module support files
1746 # clean it up only when building all modules
1747 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1748                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1749
1750 # read saved command lines for existing targets
1751 existing-targets := $(wildcard $(sort $(targets)))
1752
1753 cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1754 $(cmd_files): ; # Do not try to update included dependency files
1755 -include $(cmd_files)
1756
1757 endif   # ifeq ($(config-targets),1)
1758 endif   # ifeq ($(mixed-targets),1)
1759 endif   # skip-makefile
1760
1761 PHONY += FORCE
1762 FORCE:
1763
1764 # Declare the contents of the PHONY variable as phony.  We keep that
1765 # information in a variable so we can use it in if_changed and friends.
1766 .PHONY: $(PHONY)