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