Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 9
   3 SUBLEVEL = 269
   4 EXTRAVERSION =
   5 NAME = Roaring Lionus
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # o Do not use make's built-in rules and variables
  14 #   (this increases performance and avoids hard-to-debug behaviour);
  15 # o Look for make include files relative to root of kernel src
  16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18 # Avoid funny character set dependencies
  19 unexport LC_ALL
  20 LC_COLLATE=C
  21 LC_NUMERIC=C
  22 export LC_COLLATE LC_NUMERIC
  23
  24 # Avoid interference with shell env settings
  25 unexport GREP_OPTIONS
  26
  27 # We are using a recursive build, so we need to do a little thinking
  28 # to get the ordering right.
  29 #
  30 # Most importantly: sub-Makefiles should only ever modify files in
  31 # their own directory. If in some directory we have a dependency on
  32 # a file in another dir (which doesn't happen often, but it's often
  33 # unavoidable when linking the built-in.o targets which finally
  34 # turn into vmlinux), we will call a sub make in that other dir, and
  35 # after that we are sure that everything which is in that other dir
  36 # is now up to date.
  37 #
  38 # The only cases where we need to modify files which have global
  39 # effects are thus separated out and done before the recursive
  40 # descending is started. They are now explicitly listed as the
  41 # prepare rule.
  42
  43 # Beautify output
  44 # ---------------------------------------------------------------------------
  45 #
  46 # Normally, we echo the whole command before executing it. By making
  47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  48 # $(quiet) to choose other forms of output instead, e.g.
  49 #
  50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52 #
  53 # If $(quiet) is empty, the whole command will be printed.
  54 # If it is set to "quiet_", only the short version will be printed.
  55 # If it is set to "silent_", nothing will be printed at all, since
  56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  57 #
  58 # A simple variant is to prefix commands with $(Q) - that's useful
  59 # for commands that shall be hidden in non-verbose mode.
  60 #
  61 #       $(Q)ln $@ :<
  62 #
  63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65 #
  66 # To put more focus on warnings, be less verbose as default
  67 # Use 'make V=1' to see the full commands
  68
  69 ifeq ("$(origin V)", "command line")
  70   KBUILD_VERBOSE = $(V)
  71 endif
  72 ifndef KBUILD_VERBOSE
  73   KBUILD_VERBOSE = 0
  74 endif
  75
  76 ifeq ($(KBUILD_VERBOSE),1)
  77   quiet =
  78   Q =
  79 else
  80   quiet=quiet_
  81   Q = @
  82 endif
  83
  84 # If the user is running make -s (silent mode), suppress echoing of
  85 # commands
  86
  87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89   quiet=silent_
  90   tools_silent=s
  91 endif
  92 else                                    # make-3.8x
  93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  94   quiet=silent_
  95   tools_silent=-s
  96 endif
  97 endif
  98
  99 export quiet Q KBUILD_VERBOSE
 100
 101 # kbuild supports saving output files in a separate directory.
 102 # To locate output files in a separate directory two syntaxes are supported.
 103 # In both cases the working directory must be the root of the kernel src.
 104 # 1) O=
 105 # Use "make O=dir/to/store/output/files/"
 106 #
 107 # 2) Set KBUILD_OUTPUT
 108 # Set the environment variable KBUILD_OUTPUT to point to the directory
 109 # where the output files shall be placed.
 110 # export KBUILD_OUTPUT=dir/to/store/output/files/
 111 # make
 112 #
 113 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 114 # variable.
 115
 116 # KBUILD_SRC is set on invocation of make in OBJ directory
 117 # KBUILD_SRC is not intended to be used by the regular user (for now)
 118 ifeq ($(KBUILD_SRC),)
 119
 120 # OK, Make called in directory where kernel src resides
 121 # Do we want to locate output files in a separate directory?
 122 ifeq ("$(origin O)", "command line")
 123   KBUILD_OUTPUT := $(O)
 124 endif
 125
 126 # That's our default target when none is given on the command line
 127 PHONY := _all
 128 _all:
 129
 130 # Cancel implicit rules on top Makefile
 131 $(CURDIR)/Makefile Makefile: ;
 132
 133 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 134   $(error main directory cannot contain spaces nor colons)
 135 endif
 136
 137 ifneq ($(KBUILD_OUTPUT),)
 138 # Invoke a second make in the output directory, passing relevant variables
 139 # check that the output directory actually exists
 140 saved-output := $(KBUILD_OUTPUT)
 141 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 142                                                                 && /bin/pwd)
 143 $(if $(KBUILD_OUTPUT),, \
 144      $(error failed to create output directory "$(saved-output)"))
 145
 146 PHONY += $(MAKECMDGOALS) sub-make
 147
 148 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 149         @:
 150
 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 ($(skip-makefile),)
 162
 163 # Do not print "Entering directory ...",
 164 # but we want to display it when entering to the output directory
 165 # so that IDEs/editors are able to understand relative filenames.
 166 MAKEFLAGS += --no-print-directory
 167
 168 # Call a source code checker (by default, "sparse") as part of the
 169 # C compilation.
 170 #
 171 # Use 'make C=1' to enable checking of only re-compiled files.
 172 # Use 'make C=2' to enable checking of *all* source files, regardless
 173 # of whether they are re-compiled or not.
 174 #
 175 # See the file "Documentation/sparse.txt" for more details, including
 176 # where to get the "sparse" utility.
 177
 178 ifeq ("$(origin C)", "command line")
 179   KBUILD_CHECKSRC = $(C)
 180 endif
 181 ifndef KBUILD_CHECKSRC
 182   KBUILD_CHECKSRC = 0
 183 endif
 184
 185 # Use make M=dir to specify directory of external module to build
 186 # Old syntax make ... SUBDIRS=$PWD is still supported
 187 # Setting the environment variable KBUILD_EXTMOD take precedence
 188 ifdef SUBDIRS
 189   KBUILD_EXTMOD ?= $(SUBDIRS)
 190 endif
 191
 192 ifeq ("$(origin M)", "command line")
 193   KBUILD_EXTMOD := $(M)
 194 endif
 195
 196 # If building an external module we do not care about the all: rule
 197 # but instead _all depend on modules
 198 PHONY += all
 199 ifeq ($(KBUILD_EXTMOD),)
 200 _all: all
 201 else
 202 _all: modules
 203 endif
 204
 205 ifeq ($(KBUILD_SRC),)
 206         # building in the source tree
 207         srctree := .
 208 else
 209         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 210                 # building in a subdirectory of the source tree
 211                 srctree := ..
 212         else
 213                 srctree := $(KBUILD_SRC)
 214         endif
 215 endif
 216 objtree         := .
 217 src             := $(srctree)
 218 obj             := $(objtree)
 219
 220 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 221
 222 export srctree objtree VPATH
 223
 224 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 225 # first, and if a usermode build is happening, the "ARCH=um" on the command
 226 # line overrides the setting of ARCH below.  If a native build is happening,
 227 # then ARCH is assigned, getting whatever value it gets normally, and
 228 # SUBARCH is subsequently ignored.
 229
 230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 231                                   -e s/sun4u/sparc64/ \
 232                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 233                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 234                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 235                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 236
 237 # Cross compiling and selecting different set of gcc/bin-utils
 238 # ---------------------------------------------------------------------------
 239 #
 240 # When performing cross compilation for other architectures ARCH shall be set
 241 # to the target architecture. (See arch/* for the possibilities).
 242 # ARCH can be set during invocation of make:
 243 # make ARCH=ia64
 244 # Another way is to have ARCH set in the environment.
 245 # The default ARCH is the host where make is executed.
 246
 247 # CROSS_COMPILE specify the prefix used for all executables used
 248 # during compilation. Only gcc and related bin-utils executables
 249 # are prefixed with $(CROSS_COMPILE).
 250 # CROSS_COMPILE can be set on the command line
 251 # make CROSS_COMPILE=ia64-linux-
 252 # Alternatively CROSS_COMPILE can be set in the environment.
 253 # A third alternative is to store a setting in .config so that plain
 254 # "make" in the configured kernel build directory always uses that.
 255 # Default value for CROSS_COMPILE is not to prefix executables
 256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 257 ARCH            ?= $(SUBARCH)
 258 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 259
 260 # Architecture as present in compile.h
 261 UTS_MACHINE     := $(ARCH)
 262 SRCARCH         := $(ARCH)
 263
 264 # Additional ARCH settings for x86
 265 ifeq ($(ARCH),i386)
 266         SRCARCH := x86
 267 endif
 268 ifeq ($(ARCH),x86_64)
 269         SRCARCH := x86
 270 endif
 271
 272 # Additional ARCH settings for sparc
 273 ifeq ($(ARCH),sparc32)
 274        SRCARCH := sparc
 275 endif
 276 ifeq ($(ARCH),sparc64)
 277        SRCARCH := sparc
 278 endif
 279
 280 # Additional ARCH settings for sh
 281 ifeq ($(ARCH),sh64)
 282        SRCARCH := sh
 283 endif
 284
 285 # Additional ARCH settings for tile
 286 ifeq ($(ARCH),tilepro)
 287        SRCARCH := tile
 288 endif
 289 ifeq ($(ARCH),tilegx)
 290        SRCARCH := tile
 291 endif
 292
 293 # Where to locate arch specific headers
 294 hdr-arch  := $(SRCARCH)
 295
 296 KCONFIG_CONFIG  ?= .config
 297 export KCONFIG_CONFIG
 298
 299 # SHELL used by kbuild
 300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 301           else if [ -x /bin/bash ]; then echo /bin/bash; \
 302           else echo sh; fi ; fi)
 303
 304 HOSTCC       = gcc
 305 HOSTCXX      = g++
 306 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 307 HOSTCXXFLAGS = -O2
 308
 309 # Decide whether to build built-in, modular, or both.
 310 # Normally, just do built-in.
 311
 312 KBUILD_MODULES :=
 313 KBUILD_BUILTIN := 1
 314
 315 # If we have only "make modules", don't compile built-in objects.
 316 ifeq ($(MAKECMDGOALS),modules)
 317   KBUILD_BUILTIN :=
 318 endif
 319
 320 # If we have "make <whatever> modules", compile modules
 321 # in addition to whatever we do anyway.
 322 # Just "make" or "make all" shall build modules as well
 323
 324 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 325   KBUILD_MODULES := 1
 326 endif
 327
 328 ifeq ($(MAKECMDGOALS),)
 329   KBUILD_MODULES := 1
 330 endif
 331
 332 export KBUILD_MODULES KBUILD_BUILTIN
 333 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 334
 335 # We need some generic definitions (do not try to remake the file).
 336 scripts/Kbuild.include: ;
 337 include scripts/Kbuild.include
 338
 339 # Make variables (CC, etc...)
 340 AS              = $(CROSS_COMPILE)as
 341 LD              = $(CROSS_COMPILE)ld
 342 LDGOLD          = $(CROSS_COMPILE)ld.gold
 343 CC              = $(CROSS_COMPILE)gcc
 344 CPP             = $(CC) -E
 345 AR              = $(CROSS_COMPILE)ar
 346 NM              = $(CROSS_COMPILE)nm
 347 STRIP           = $(CROSS_COMPILE)strip
 348 OBJCOPY         = $(CROSS_COMPILE)objcopy
 349 OBJDUMP         = $(CROSS_COMPILE)objdump
 350 AWK             = awk
 351 GENKSYMS        = scripts/genksyms/genksyms
 352 INSTALLKERNEL  := installkernel
 353 DEPMOD          = depmod
 354 PERL            = perl
 355 PYTHON          = python
 356 CHECK           = sparse
 357
 358 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 359                   -Wbitwise -Wno-return-void $(CF)
 360 NOSTDINC_FLAGS  =
 361 CFLAGS_MODULE   =
 362 AFLAGS_MODULE   =
 363 LDFLAGS_MODULE  =
 364 CFLAGS_KERNEL   =
 365 AFLAGS_KERNEL   =
 366 LDFLAGS_vmlinux =
 367
 368 # Use USERINCLUDE when you must reference the UAPI directories only.
 369 USERINCLUDE    := \
 370                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 371                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 372                 -I$(srctree)/include/uapi \
 373                 -I$(objtree)/include/generated/uapi \
 374                 -include $(srctree)/include/linux/kconfig.h
 375
 376 # Use LINUXINCLUDE when you must reference the include/ directory.
 377 # Needed to be compatible with the O= option
 378 LINUXINCLUDE    := \
 379                 -I$(srctree)/arch/$(hdr-arch)/include \
 380                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 381                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
 382                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 383                 -I$(objtree)/include
 384
 385 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 386
 387 KBUILD_AFLAGS   := -D__ASSEMBLY__
 388 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 389                    -fno-strict-aliasing -fno-common -fshort-wchar \
 390                    -Werror-implicit-function-declaration \
 391                    -Wno-format-security \
 392                    -Werror      \
 393                    -std=gnu89 $(call cc-option,-fno-PIE)
 394
 395
 396 KBUILD_CPPFLAGS := -D__KERNEL__
 397 KBUILD_AFLAGS_KERNEL :=
 398 KBUILD_CFLAGS_KERNEL :=
 399 KBUILD_AFLAGS_MODULE  := -DMODULE
 400 KBUILD_CFLAGS_MODULE  := -DMODULE
 401 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 402 GCC_PLUGINS_CFLAGS :=
 403 CLANG_FLAGS :=
 404
 405 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 406 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 407 KERNELRELEASE_FULL = $(shell cat include/config/kernel.release_full 2> /dev/null)
 408 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 409
 410 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 411 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 412 export CPP AR NM STRIP OBJCOPY OBJDUMP
 413 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 414 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 415
 416 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 417 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 418 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 419 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 420 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 421 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 422 export KBUILD_ARFLAGS
 423
 424 # When compiling out-of-tree modules, put MODVERDIR in the module
 425 # tree rather than in the kernel tree. The kernel tree might
 426 # even be read-only.
 427 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 428
 429 # Files to ignore in find ... statements
 430
 431 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 432                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 433                           -prune -o
 434 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 435                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 436
 437 # ===========================================================================
 438 # Rules shared between *config targets and build targets
 439
 440 # Basic helpers built in scripts/
 441 PHONY += scripts_basic
 442 scripts_basic:
 443         $(Q)$(MAKE) $(build)=scripts/basic
 444         $(Q)rm -f .tmp_quiet_recordmcount
 445         $(Q)if [ -d $(srctree)/.git/hooks ]; then \
 446                 cp $(srctree)/scripts/amlogic/pre-commit $(srctree)/.git/hooks/; \
 447                 chmod +x $(srctree)/.git/hooks/pre-commit; \
 448         fi
 449 #$(Q)mkdir -p $(srctree)/.git/hooks
 450
 451 # To avoid any implicit rule to kick in, define an empty command.
 452 scripts/basic/%: scripts_basic ;
 453
 454 PHONY += outputmakefile
 455 # outputmakefile generates a Makefile in the output directory, if using a
 456 # separate output directory. This allows convenient use of make in the
 457 # output directory.
 458 outputmakefile:
 459 ifneq ($(KBUILD_SRC),)
 460         $(Q)ln -fsn $(srctree) source
 461         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 462             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 463 endif
 464
 465 # Support for using generic headers in asm-generic
 466 PHONY += asm-generic
 467 asm-generic:
 468         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 469                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 470         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 471                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 472
 473 # To make sure we do not include .config for any of the *config targets
 474 # catch them early, and hand them over to scripts/kconfig/Makefile
 475 # It is allowed to specify more targets when calling make, including
 476 # mixing *config targets and build targets.
 477 # For example 'make oldconfig all'.
 478 # Detect when mixed targets is specified, and make a second invocation
 479 # of make so .config is not included in this case either (for *config).
 480
 481 version_h := include/generated/uapi/linux/version.h
 482 old_version_h := include/linux/version.h
 483
 484 no-dot-config-targets := clean mrproper distclean \
 485                          cscope gtags TAGS tags help% %docs check% coccicheck \
 486                          $(version_h) headers_% archheaders archscripts \
 487                          kernelversion %src-pkg
 488
 489 config-targets := 0
 490 mixed-targets  := 0
 491 dot-config     := 1
 492
 493 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 494         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 495                 dot-config := 0
 496         endif
 497 endif
 498
 499 ifeq ($(KBUILD_EXTMOD),)
 500         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 501                 config-targets := 1
 502                 ifneq ($(words $(MAKECMDGOALS)),1)
 503                         mixed-targets := 1
 504                 endif
 505         endif
 506 endif
 507 # install and module_install need also be processed one by one
 508 ifneq ($(filter install,$(MAKECMDGOALS)),)
 509         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 510                 mixed-targets := 1
 511         endif
 512 endif
 513
 514 ifeq ($(cc-name),clang)
 515 ifneq ($(CROSS_COMPILE),)
 516 CLANG_TRIPLE    ?= $(CROSS_COMPILE)
 517 CLANG_FLAGS     += --target=$(notdir $(CLANG_TRIPLE:%-=%))
 518 ifeq ($(shell $(srctree)/scripts/clang-android.sh $(CC) $(CLANG_FLAGS)), y)
 519 $(error "Clang with Android --target detected. Did you specify CLANG_TRIPLE?")
 520 endif
 521 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 522 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 523 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 524 endif
 525 ifneq ($(GCC_TOOLCHAIN),)
 526 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 527 endif
 528 CLANG_FLAGS     += -no-integrated-as
 529 CLANG_FLAGS     += -Werror=unknown-warning-option
 530 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 531 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 532 endif
 533
 534
 535 ifeq ($(mixed-targets),1)
 536 # ===========================================================================
 537 # We're called with mixed targets (*config and build targets).
 538 # Handle them one by one.
 539
 540 PHONY += $(MAKECMDGOALS) __build_one_by_one
 541
 542 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 543         @:
 544
 545 __build_one_by_one:
 546         $(Q)set -e; \
 547         for i in $(MAKECMDGOALS); do \
 548                 $(MAKE) -f $(srctree)/Makefile $$i; \
 549         done
 550
 551 else
 552 ifeq ($(config-targets),1)
 553 # ===========================================================================
 554 # *config targets only - make sure prerequisites are updated, and descend
 555 # in scripts/kconfig to make the *config target
 556
 557 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 558 # KBUILD_DEFCONFIG may point out an alternative default configuration
 559 # used for 'make defconfig'
 560 include arch/$(SRCARCH)/Makefile
 561 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 562
 563 config: scripts_basic outputmakefile FORCE
 564         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 565
 566 %config: scripts_basic outputmakefile FORCE
 567         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 568
 569 else
 570 # ===========================================================================
 571 # Build targets only - this includes vmlinux, arch specific targets, clean
 572 # targets and others. In general all targets except *config targets.
 573
 574 ifeq ($(KBUILD_EXTMOD),)
 575 # Additional helpers built in scripts/
 576 # Carefully list dependencies so we do not try to build scripts twice
 577 # in parallel
 578 PHONY += scripts
 579 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 580          asm-generic gcc-plugins
 581         $(Q)$(MAKE) $(build)=$(@)
 582
 583 # Objects we will link into vmlinux / subdirs we need to visit
 584 init-y          := init/
 585 drivers-y       := drivers/ sound/ firmware/
 586 net-y           := net/
 587 libs-y          := lib/
 588 core-y          := usr/
 589 virt-y          := virt/
 590 endif # KBUILD_EXTMOD
 591
 592 ifeq ($(dot-config),1)
 593 # Read in config
 594 -include include/config/auto.conf
 595
 596 ifeq ($(KBUILD_EXTMOD),)
 597 # Read in dependencies to all Kconfig* files, make sure to run
 598 # oldconfig if changes are detected.
 599 -include include/config/auto.conf.cmd
 600
 601 # To avoid any implicit rule to kick in, define an empty command
 602 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 603
 604 # If .config is newer than include/config/auto.conf, someone tinkered
 605 # with it and forgot to run make oldconfig.
 606 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 607 # we execute the config step to be sure to catch updated Kconfig files
 608 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 609         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 610 else
 611 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 612 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 613 PHONY += include/config/auto.conf
 614
 615 include/config/auto.conf:
 616         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 617         echo >&2;                                                       \
 618         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 619         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 620         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 621         echo >&2 ;                                                      \
 622         /bin/false)
 623
 624 endif # KBUILD_EXTMOD
 625
 626 else
 627 # Dummy target needed, because used as prerequisite
 628 include/config/auto.conf: ;
 629 endif # $(dot-config)
 630
 631 # For the kernel to actually contain only the needed exported symbols,
 632 # we have to build modules as well to determine what those symbols are.
 633 # (this can be evaluated only once include/config/auto.conf has been included)
 634 ifdef CONFIG_TRIM_UNUSED_KSYMS
 635   KBUILD_MODULES := 1
 636 endif
 637
 638 # The all: target is the default when no target is given on the
 639 # command line.
 640 # This allow a user to issue only 'make' to build a kernel including modules
 641 # Defaults to vmlinux, but the arch makefile usually adds further targets
 642 all: vmlinux
 643
 644 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 645 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 646 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 647         $(call cc-option,-fno-tree-loop-im) \
 648         $(call cc-disable-warning,maybe-uninitialized,)
 649 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 650 export CFLAGS_GCOV CFLAGS_KCOV
 651
 652 # Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
 653 # ar/cc/ld-* macros return correct values.
 654 ifdef CONFIG_LTO_CLANG
 655 # use GNU gold with LLVMgold for LTO linking, and LD for vmlinux_link
 656 LDFINAL_vmlinux := $(LD)
 657 LD              := $(LDGOLD)
 658 LDFLAGS         += -plugin LLVMgold.so
 659 # use llvm-ar for building symbol tables from IR files, and llvm-dis instead
 660 # of objdump for processing symbol versions and exports
 661 LLVM_AR         := llvm-ar
 662 LLVM_DIS        := llvm-dis
 663 export LLVM_AR LLVM_DIS
 664 endif
 665
 666 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 667 # values of the respective KBUILD_* variables
 668 ARCH_CPPFLAGS :=
 669 ARCH_AFLAGS :=
 670 ARCH_CFLAGS :=
 671 include arch/$(SRCARCH)/Makefile
 672
 673 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 674 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 675 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 676 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 677 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 678 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 679 KBUILD_CFLAGS   += $(call cc-disable-warning, attribute-alias)
 680
 681 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 682 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 683 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 684 endif
 685
 686 ifdef CONFIG_LTO_CLANG
 687 lto-clang-flags := -flto -fvisibility=hidden
 688
 689 # allow disabling only clang LTO where needed
 690 DISABLE_LTO_CLANG := -fno-lto -fvisibility=default
 691 export DISABLE_LTO_CLANG
 692 endif
 693
 694 ifdef CONFIG_LTO
 695 lto-flags       := $(lto-clang-flags)
 696 KBUILD_CFLAGS   += $(lto-flags)
 697
 698 DISABLE_LTO     := $(DISABLE_LTO_CLANG)
 699 export DISABLE_LTO
 700
 701 # LDFINAL_vmlinux and LDFLAGS_FINAL_vmlinux can be set to override
 702 # the linker and flags for vmlinux_link.
 703 export LDFINAL_vmlinux LDFLAGS_FINAL_vmlinux
 704 endif
 705
 706 ifdef CONFIG_CFI_CLANG
 707 cfi-clang-flags += -fsanitize=cfi $(call cc-option, -fsplit-lto-unit)
 708 DISABLE_CFI_CLANG := -fno-sanitize=cfi
 709 ifdef CONFIG_MODULES
 710 cfi-clang-flags += -fsanitize-cfi-cross-dso
 711 DISABLE_CFI_CLANG += -fno-sanitize-cfi-cross-dso
 712 endif
 713 ifdef CONFIG_CFI_PERMISSIVE
 714 cfi-clang-flags += -fsanitize-recover=cfi -fno-sanitize-trap=cfi
 715 endif
 716
 717 # also disable CFI when LTO is disabled
 718 DISABLE_LTO_CLANG += $(DISABLE_CFI_CLANG)
 719 # allow disabling only clang CFI where needed
 720 export DISABLE_CFI_CLANG
 721 endif
 722
 723 ifdef CONFIG_CFI
 724 # cfi-flags are re-tested in prepare-compiler-check
 725 cfi-flags       := $(cfi-clang-flags)
 726 KBUILD_CFLAGS   += $(cfi-flags)
 727
 728 DISABLE_CFI     := $(DISABLE_CFI_CLANG)
 729 DISABLE_LTO     += $(DISABLE_CFI)
 730 export DISABLE_CFI
 731 endif
 732
 733 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 734 KBUILD_CFLAGS   += -Os
 735 else
 736 KBUILD_CFLAGS   += -O2
 737 endif
 738
 739 # Tell gcc to never replace conditional load with a non-conditional one
 740 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 741 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 742
 743 # check for 'asm goto'
 744 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 745         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 746         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 747 endif
 748
 749 include scripts/Makefile.gcc-plugins
 750
 751 ifdef CONFIG_READABLE_ASM
 752 # Disable optimizations that make assembler listings hard to read.
 753 # reorder blocks reorders the control in the function
 754 # ipa clone creates specialized cloned functions
 755 # partial inlining inlines only parts of functions
 756 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 757                  $(call cc-option,-fno-ipa-cp-clone,) \
 758                  $(call cc-option,-fno-partial-inlining)
 759 endif
 760
 761 ifneq ($(CONFIG_FRAME_WARN),0)
 762 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 763 endif
 764
 765 # This selects the stack protector compiler flag. Testing it is delayed
 766 # until after .config has been reprocessed, in the prepare-compiler-check
 767 # target.
 768 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 769   stackp-flag := -fstack-protector
 770   stackp-name := REGULAR
 771 else
 772 ifdef CONFIG_CC_STACKPROTECTOR_STRONG_AMLOGIC
 773   stackp-flag := -fstack-protector-strong
 774   stackp-name := STRONG
 775 else
 776   # Force off for distro compilers that enable stack protector by default.
 777   stackp-flag := $(call cc-option, -fno-stack-protector)
 778 endif
 779 endif
 780 # Find arch-specific stack protector compiler sanity-checking script.
 781 ifdef CONFIG_CC_STACKPROTECTOR
 782   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 783   stackp-check := $(wildcard $(stackp-path))
 784 endif
 785 KBUILD_CFLAGS += $(stackp-flag)
 786
 787 ifeq ($(cc-name),clang)
 788 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 789 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 790 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 791 KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
 792 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 793 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 794 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 795 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 796 # See modpost pattern 2
 797 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 798 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 799 else
 800
 801 # These warnings generated too much noise in a regular build.
 802 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 803 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 804 endif
 805
 806 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 807 ifdef CONFIG_FRAME_POINTER
 808 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 809 else
 810 # Some targets (ARM with Thumb2, for example), can't be built with frame
 811 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 812 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 813 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 814 # -fomit-frame-pointer with FUNCTION_TRACER.
 815 ifndef CONFIG_FUNCTION_TRACER
 816 KBUILD_CFLAGS   += -fomit-frame-pointer
 817 endif
 818 endif
 819
 820 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 821
 822 ifdef CONFIG_DEBUG_INFO
 823 ifdef CONFIG_DEBUG_INFO_SPLIT
 824 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 825 else
 826 KBUILD_CFLAGS   += -g
 827 endif
 828 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 829 endif
 830 ifdef CONFIG_DEBUG_INFO_DWARF4
 831 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 832 endif
 833
 834 ifdef CONFIG_DEBUG_INFO_REDUCED
 835 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 836                    $(call cc-option,-fno-var-tracking)
 837 endif
 838
 839 ifdef CONFIG_FUNCTION_TRACER
 840 ifndef CC_FLAGS_FTRACE
 841 CC_FLAGS_FTRACE := -pg
 842 endif
 843 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 844   # gcc 5 supports generating the mcount tables directly
 845   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 846     CC_FLAGS_FTRACE     += -mrecord-mcount
 847     export CC_USING_RECORD_MCOUNT := 1
 848   endif
 849 endif
 850 export CC_FLAGS_FTRACE
 851 ifdef CONFIG_HAVE_FENTRY
 852 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 853 endif
 854 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 855 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 856 ifdef CONFIG_DYNAMIC_FTRACE
 857         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 858                 BUILD_C_RECORDMCOUNT := y
 859                 export BUILD_C_RECORDMCOUNT
 860         endif
 861 endif
 862 endif
 863
 864 # We trigger additional mismatches with less inlining
 865 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 866 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 867 endif
 868
 869 # arch Makefile may override CC so keep this after arch Makefile is included
 870 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 871 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 872
 873 # warn about C99 declaration after statement
 874 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 875
 876 # disable pointer signed / unsigned warnings in gcc 4.0
 877 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 878
 879 # disable stringop warnings in gcc 8+
 880 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 881
 882 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 883 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 884 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 885 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 886
 887 # Another good warning that we'll want to enable eventually
 888 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 889
 890 # Enabled with W=2, disabled by default as noisy
 891 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 892
 893 # disable invalid "can't wrap" optimizations for signed / pointers
 894 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 895
 896 # clang sets -fmerge-all-constants by default as optimization, but this
 897 # is non-conforming behavior for C and in fact breaks the kernel, so we
 898 # need to disable it here generally.
 899 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 900
 901 # for gcc -fno-merge-all-constants disables everything, but it is fine
 902 # to have actual conforming behavior enabled.
 903 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 904
 905 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 906 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 907
 908 # conserve stack if available
 909 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 910
 911 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 912 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 913
 914 # require functions to have arguments in prototypes, not empty 'int foo()'
 915 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 916
 917 # Prohibit date/time macros, which would make the build non-deterministic
 918 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 919
 920 # enforce correct pointer usage
 921 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 922
 923 # Require designated initializers for all marked structures
 924 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 925
 926 # change __FILE__ to the relative path from the srctree
 927 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 928
 929 # use the deterministic mode of AR if available
 930 KBUILD_ARFLAGS := $(call ar-option,D)
 931
 932 include scripts/Makefile.kasan
 933 include scripts/Makefile.extrawarn
 934 include scripts/Makefile.ubsan
 935
 936 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 937 # last assignments
 938 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 939 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 940 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 941
 942 # Use --build-id when available.
 943 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 944                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 945 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 946 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 947
 948 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 949 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 950 endif
 951
 952 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 953 LDFLAGS_vmlinux += $(call ld-option, -X,)
 954 endif
 955
 956 # Default kernel image to build when no specific target is given.
 957 # KBUILD_IMAGE may be overruled on the command line or
 958 # set in the environment
 959 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 960 # this default value
 961 export KBUILD_IMAGE ?= vmlinux
 962
 963 #
 964 # INSTALL_PATH specifies where to place the updated kernel and system map
 965 # images. Default is /boot, but you can set it to other values
 966 export  INSTALL_PATH ?= /boot
 967
 968 #
 969 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 970 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 971 # an argument if needed. Otherwise it defaults to the kernel install path
 972 #
 973 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 974
 975 #
 976 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 977 # relocations required by build roots.  This is not defined in the
 978 # makefile but the argument can be passed to make if needed.
 979 #
 980
 981 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 982 export MODLIB
 983
 984 #
 985 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 986 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 987 # the default option --strip-debug will be used.  Otherwise,
 988 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 989
 990 ifdef INSTALL_MOD_STRIP
 991 ifeq ($(INSTALL_MOD_STRIP),1)
 992 mod_strip_cmd = $(STRIP) --strip-debug
 993 else
 994 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 995 endif # INSTALL_MOD_STRIP=1
 996 else
 997 mod_strip_cmd = true
 998 endif # INSTALL_MOD_STRIP
 999 export mod_strip_cmd
1000
1001 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1002 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1003 # or CONFIG_MODULE_COMPRESS_XZ.
1004
1005 mod_compress_cmd = true
1006 ifdef CONFIG_MODULE_COMPRESS
1007   ifdef CONFIG_MODULE_COMPRESS_GZIP
1008     mod_compress_cmd = gzip -n -f
1009   endif # CONFIG_MODULE_COMPRESS_GZIP
1010   ifdef CONFIG_MODULE_COMPRESS_XZ
1011     mod_compress_cmd = xz -f
1012   endif # CONFIG_MODULE_COMPRESS_XZ
1013 endif # CONFIG_MODULE_COMPRESS
1014 export mod_compress_cmd
1015
1016 # Select initial ramdisk compression format, default is gzip(1).
1017 # This shall be used by the dracut(8) tool while creating an initramfs image.
1018 #
1019 INITRD_COMPRESS-y                  := gzip
1020 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
1021 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
1022 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
1023 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
1024 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
1025 # do not export INITRD_COMPRESS, since we didn't actually
1026 # choose a sane default compression above.
1027 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1028
1029 ifdef CONFIG_MODULE_SIG_ALL
1030 $(eval $(call config_filename,MODULE_SIG_KEY))
1031
1032 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1033 else
1034 mod_sign_cmd = true
1035 endif
1036 export mod_sign_cmd
1037
1038
1039 ifeq ($(KBUILD_EXTMOD),)
1040 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1041
1042 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1043                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1044                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1045
1046 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1047                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1048
1049 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
1050 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
1051 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
1052 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
1053 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1054 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
1055 libs-y          := $(libs-y1) $(libs-y2)
1056 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
1057
1058 # Externally visible symbols (used by link-vmlinux.sh)
1059 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1060 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
1061 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1062 export LDFLAGS_vmlinux
1063 # used by scripts/pacmage/Makefile
1064 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1065
1066 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
1067
1068 # Include targets which we want to execute sequentially if the rest of the
1069 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1070 # evaluated more than once.
1071 PHONY += vmlinux_prereq
1072 vmlinux_prereq: $(vmlinux-deps) FORCE
1073 ifdef CONFIG_HEADERS_CHECK
1074         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1075 endif
1076 ifdef CONFIG_GDB_SCRIPTS
1077         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
1078 endif
1079 ifdef CONFIG_TRIM_UNUSED_KSYMS
1080         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1081           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1082 endif
1083
1084 # standalone target for easier testing
1085 include/generated/autoksyms.h: FORCE
1086         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1087
1088 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1089
1090 # Final link of vmlinux with optional arch pass after final link
1091     cmd_link-vmlinux =                                                 \
1092         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
1093         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1094
1095 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1096         +$(call if_changed,link-vmlinux)
1097
1098 # Build samples along the rest of the kernel
1099 ifdef CONFIG_SAMPLES
1100 vmlinux-dirs += samples
1101 endif
1102
1103 # The actual objects are generated when descending,
1104 # make sure no implicit rule kicks in
1105 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1106
1107 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1108 # Preset locale variables to speed up the build process. Limit locale
1109 # tweaks to this spot to avoid wrong language settings when running
1110 # make menuconfig etc.
1111 # Error messages still appears in the original language
1112
1113 PHONY += $(vmlinux-dirs)
1114 $(vmlinux-dirs): prepare scripts
1115         $(Q)$(MAKE) $(build)=$@
1116
1117 define filechk_kernel.release
1118         echo "$(KERNELVERSION)"
1119 endef
1120
1121 define filechk_kernel.release_full
1122         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1123 endef
1124
1125
1126 # Store (new) KERNELRELEASE string in include/config/kernel.release
1127 include/config/kernel.release: include/config/auto.conf FORCE
1128         $(call filechk,kernel.release)
1129
1130 include/config/kernel.release_full: include/config/auto.conf FORCE
1131         $(call filechk,kernel.release_full)
1132
1133
1134 # Things we need to do before we recursively start building the kernel
1135 # or the modules are listed in "prepare".
1136 # A multi level approach is used. prepareN is processed before prepareN-1.
1137 # archprepare is used in arch Makefiles and when processed asm symlink,
1138 # version.h and scripts_basic is processed / created.
1139
1140 # Listed in dependency order
1141 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1142
1143 # prepare3 is used to check if we are building in a separate output directory,
1144 # and if so do:
1145 # 1) Check that make has not been executed in the kernel src $(srctree)
1146 prepare3: include/config/kernel.release include/config/kernel.release_full
1147 ifneq ($(KBUILD_SRC),)
1148         @$(kecho) '  Using $(srctree) as source for kernel'
1149         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1150                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1151                 echo >&2 "  in the '$(srctree)' directory.";\
1152                 /bin/false; \
1153         fi;
1154 endif
1155
1156 # prepare2 creates a makefile if using a separate output directory.
1157 # From this point forward, .config has been reprocessed, so any rules
1158 # that need to depend on updated CONFIG_* values can be checked here.
1159 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1160
1161 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1162                    include/config/auto.conf
1163         $(cmd_crmodverdir)
1164
1165 archprepare: archheaders archscripts prepare1 scripts_basic
1166
1167 prepare0: archprepare gcc-plugins
1168         $(Q)$(MAKE) $(build)=.
1169
1170 # All the preparing..
1171 prepare: prepare0 prepare-objtool
1172
1173 ifdef CONFIG_STACK_VALIDATION
1174   has_libelf := $(call try-run,\
1175                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1176   ifeq ($(has_libelf),1)
1177     objtool_target := tools/objtool FORCE
1178   else
1179     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1180     SKIP_STACK_VALIDATION := 1
1181     export SKIP_STACK_VALIDATION
1182   endif
1183 endif
1184
1185 PHONY += prepare-objtool
1186 prepare-objtool: $(objtool_target)
1187
1188 # Check for CONFIG flags that require compiler support. Abort the build
1189 # after .config has been processed, but before the kernel build starts.
1190 #
1191 # For security-sensitive CONFIG options, we don't want to fallback and/or
1192 # silently change which compiler flags will be used, since that leads to
1193 # producing kernels with different security feature characteristics
1194 # depending on the compiler used. (For example, "But I selected
1195 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1196 PHONY += prepare-compiler-check
1197 prepare-compiler-check: FORCE
1198 # Make sure we're using a supported toolchain with LTO_CLANG
1199 ifdef CONFIG_LTO_CLANG
1200   ifneq ($(call clang-ifversion, -ge, 0500, y), y)
1201         @echo Cannot use CONFIG_LTO_CLANG: requires clang 5.0 or later >&2 && exit 1
1202   endif
1203   ifneq ($(call gold-ifversion, -ge, 112000000, y), y)
1204         @echo Cannot use CONFIG_LTO_CLANG: requires GNU gold 1.12 or later >&2 && exit 1
1205   endif
1206 endif
1207 # Make sure compiler supports LTO flags
1208 ifdef lto-flags
1209   ifeq ($(call cc-option, $(lto-flags)),)
1210         @echo Cannot use CONFIG_LTO: $(lto-flags) not supported by compiler \
1211                 >&2 && exit 1
1212   endif
1213 endif
1214 # Make sure compiler supports requested stack protector flag.
1215 ifdef stackp-name
1216   ifeq ($(call cc-option, $(stackp-flag)),)
1217         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1218                   $(stackp-flag) not supported by compiler >&2 && exit 1
1219   endif
1220 endif
1221 # Make sure compiler does not have buggy stack-protector support.
1222 ifdef stackp-check
1223   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1224         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1225                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1226   endif
1227 endif
1228 ifdef cfi-flags
1229   ifeq ($(call cc-option, $(cfi-flags)),)
1230         @echo Cannot use CONFIG_CFI: $(cfi-flags) not supported by compiler >&2 && exit 1
1231   endif
1232 endif
1233         @:
1234
1235 # Generate some files
1236 # ---------------------------------------------------------------------------
1237
1238 # KERNELRELEASE can change from a few different places, meaning version.h
1239 # needs to be updated, so this check is forced on all builds
1240
1241 uts_len := 64
1242 ifneq (,$(BUILD_NUMBER))
1243         UTS_RELEASE=$(KERNELRELEASE)-ab$(BUILD_NUMBER)
1244 else
1245         UTS_RELEASE=$(KERNELRELEASE)
1246 endif
1247 define filechk_utsrelease.h
1248         if [ `echo -n "$(UTS_RELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1249           echo '"$(UTS_RELEASE)" exceeds $(uts_len) characters' >&2;    \
1250           exit 1;                                                       \
1251         fi;                                                             \
1252         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; echo \#define UTS_RELEASE_FULL \"$(KERNELRELEASE_FULL)\";)
1253 endef
1254
1255 define filechk_version.h
1256         (echo \#define LINUX_VERSION_CODE $(shell                         \
1257         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
1258         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1259 endef
1260
1261 $(version_h): $(srctree)/Makefile FORCE
1262         $(call filechk,version.h)
1263         $(Q)rm -f $(old_version_h)
1264
1265 include/generated/utsrelease.h: include/config/kernel.release include/config/kernel.release_full FORCE
1266         $(call filechk,utsrelease.h)
1267
1268 PHONY += headerdep
1269 headerdep:
1270         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1271         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1272
1273 # ---------------------------------------------------------------------------
1274 # Firmware install
1275 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1276 export INSTALL_FW_PATH
1277
1278 PHONY += firmware_install
1279 firmware_install:
1280         @mkdir -p $(objtree)/firmware
1281         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1282
1283 # ---------------------------------------------------------------------------
1284 # Kernel headers
1285
1286 #Default location for installed headers
1287 export INSTALL_HDR_PATH = $(objtree)/usr
1288
1289 # If we do an all arch process set dst to asm-$(hdr-arch)
1290 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1291
1292 PHONY += archheaders
1293 archheaders:
1294
1295 PHONY += archscripts
1296 archscripts:
1297
1298 PHONY += __headers
1299 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1300         $(Q)$(MAKE) $(build)=scripts build_unifdef
1301
1302 PHONY += headers_install_all
1303 headers_install_all:
1304         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1305
1306 PHONY += headers_install
1307 headers_install: __headers
1308         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1309           $(error Headers not exportable for the $(SRCARCH) architecture))
1310         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1311         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1312
1313 PHONY += headers_check_all
1314 headers_check_all: headers_install_all
1315         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1316
1317 PHONY += headers_check
1318 headers_check: headers_install
1319         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1320         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1321
1322 # ---------------------------------------------------------------------------
1323 # Kernel selftest
1324
1325 PHONY += kselftest
1326 kselftest:
1327         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1328
1329 kselftest-clean:
1330         $(Q)$(MAKE) -C tools/testing/selftests clean
1331
1332 PHONY += kselftest-merge
1333 kselftest-merge:
1334         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1335         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1336                 -m $(objtree)/.config \
1337                 $(srctree)/tools/testing/selftests/*/config
1338         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1339
1340 # ---------------------------------------------------------------------------
1341 # Modules
1342
1343 ifdef CONFIG_MODULES
1344
1345 # By default, build modules as well
1346
1347 all: modules
1348
1349 # When we're building modules with modversions, we need to consider
1350 # the built-in objects during the descend as well, in order to
1351 # make sure the checksums are up to date before we record them.
1352 ifdef CONFIG_MODVERSIONS
1353   KBUILD_BUILTIN := 1
1354 endif
1355
1356 # Build modules
1357 #
1358 # A module can be listed more than once in obj-m resulting in
1359 # duplicate lines in modules.order files.  Those are removed
1360 # using awk while concatenating to the final file.
1361
1362 PHONY += modules
1363 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1364         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1365         @$(kecho) '  Building modules, stage 2.';
1366         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1367         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1368
1369 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1370         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1371
1372 %/modules.builtin: include/config/auto.conf
1373         $(Q)$(MAKE) $(modbuiltin)=$*
1374
1375
1376 # Target to prepare building external modules
1377 PHONY += modules_prepare
1378 modules_prepare: prepare scripts
1379
1380 # Target to install modules
1381 PHONY += modules_install
1382 modules_install: _modinst_ _modinst_post
1383
1384 PHONY += _modinst_
1385 _modinst_:
1386         @rm -rf $(MODLIB)/kernel
1387         @rm -f $(MODLIB)/source
1388         @mkdir -p $(MODLIB)/kernel
1389         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1390         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1391                 rm -f $(MODLIB)/build ; \
1392                 ln -s $(CURDIR) $(MODLIB)/build ; \
1393         fi
1394         @cp -f $(objtree)/modules.order $(MODLIB)/
1395         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1396         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1397
1398 # This depmod is only for convenience to give the initial
1399 # boot a modules.dep even before / is mounted read-write.  However the
1400 # boot script depmod is the master version.
1401 PHONY += _modinst_post
1402 _modinst_post: _modinst_
1403         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1404         $(call cmd,depmod)
1405
1406 ifeq ($(CONFIG_MODULE_SIG), y)
1407 PHONY += modules_sign
1408 modules_sign:
1409         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1410 endif
1411
1412 else # CONFIG_MODULES
1413
1414 # Modules not configured
1415 # ---------------------------------------------------------------------------
1416
1417 PHONY += modules modules_install
1418 modules modules_install:
1419         @echo >&2
1420         @echo >&2 "The present kernel configuration has modules disabled."
1421         @echo >&2 "Type 'make config' and enable loadable module support."
1422         @echo >&2 "Then build a kernel with module support enabled."
1423         @echo >&2
1424         @exit 1
1425
1426 endif # CONFIG_MODULES
1427
1428 ###
1429 # Cleaning is done on three levels.
1430 # make clean     Delete most generated files
1431 #                Leave enough to build external modules
1432 # make mrproper  Delete the current configuration, and all generated files
1433 # make distclean Remove editor backup files, patch leftover files and the like
1434
1435 # Directories & files removed with 'make clean'
1436 CLEAN_DIRS  += $(MODVERDIR)
1437
1438 # Directories & files removed with 'make mrproper'
1439 MRPROPER_DIRS  += include/config usr/include include/generated          \
1440                   arch/*/include/generated .tmp_objdiff
1441 MRPROPER_FILES += .config .config.old .version .old_version \
1442                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1443                   signing_key.pem signing_key.priv signing_key.x509     \
1444                   x509.genkey extra_certificates signing_key.x509.keyid \
1445                   signing_key.x509.signer vmlinux-gdb.py
1446
1447 # clean - Delete most, but leave enough to build external modules
1448 #
1449 clean: rm-dirs  := $(CLEAN_DIRS)
1450 clean: rm-files := $(CLEAN_FILES)
1451 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1452
1453 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1454 $(clean-dirs):
1455         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1456
1457 vmlinuxclean:
1458         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1459         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1460
1461 clean: archclean vmlinuxclean
1462
1463 # mrproper - Delete all generated files, including .config
1464 #
1465 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1466 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1467 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1468
1469 PHONY += $(mrproper-dirs) mrproper archmrproper
1470 $(mrproper-dirs):
1471         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1472
1473 mrproper: clean archmrproper $(mrproper-dirs)
1474         $(call cmd,rmdirs)
1475         $(call cmd,rmfiles)
1476
1477 # distclean
1478 #
1479 PHONY += distclean
1480
1481 distclean: mrproper
1482         @find $(srctree) $(RCS_FIND_IGNORE) \
1483                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1484                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1485                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1486                 -type f -print | xargs rm -f
1487
1488
1489 # Packaging of the kernel to various formats
1490 # ---------------------------------------------------------------------------
1491 # rpm target kept for backward compatibility
1492 package-dir     := scripts/package
1493
1494 %src-pkg: FORCE
1495         $(Q)$(MAKE) $(build)=$(package-dir) $@
1496 %pkg: include/config/kernel.release FORCE
1497         $(Q)$(MAKE) $(build)=$(package-dir) $@
1498 rpm: include/config/kernel.release FORCE
1499         $(Q)$(MAKE) $(build)=$(package-dir) $@
1500
1501
1502 # Brief documentation of the typical targets used
1503 # ---------------------------------------------------------------------------
1504
1505 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1506 boards := $(sort $(notdir $(boards)))
1507 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1508 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1509
1510 PHONY += help
1511 help:
1512         @echo  'Cleaning targets:'
1513         @echo  '  clean           - Remove most generated files but keep the config and'
1514         @echo  '                    enough build support to build external modules'
1515         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1516         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1517         @echo  ''
1518         @echo  'Configuration targets:'
1519         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1520         @echo  ''
1521         @echo  'Other generic targets:'
1522         @echo  '  all             - Build all targets marked with [*]'
1523         @echo  '* vmlinux         - Build the bare kernel'
1524         @echo  '* modules         - Build all modules'
1525         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1526         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1527         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1528         @echo  '  dir/            - Build all files in dir and below'
1529         @echo  '  dir/file.[ois]  - Build specified target only'
1530         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1531         @echo  '                    (requires compiler support for LLVM assembly generation)'
1532         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1533         @echo  '                    (requires a recent binutils and recent build (System.map))'
1534         @echo  '  dir/file.ko     - Build module including final link'
1535         @echo  '  modules_prepare - Set up for building external modules'
1536         @echo  '  tags/TAGS       - Generate tags file for editors'
1537         @echo  '  cscope          - Generate cscope index'
1538         @echo  '  gtags           - Generate GNU GLOBAL index'
1539         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1540         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1541         @echo  '  image_name      - Output the image name (use with make -s)'
1542         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1543          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1544          echo  ''
1545         @echo  'Static analysers'
1546         @echo  '  checkstack      - Generate a list of stack hogs'
1547         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1548         @echo  '  versioncheck    - Sanity check on version.h usage'
1549         @echo  '  includecheck    - Check for duplicate included header files'
1550         @echo  '  export_report   - List the usages of all exported symbols'
1551         @echo  '  headers_check   - Sanity check on exported headers'
1552         @echo  '  headerdep       - Detect inclusion cycles in headers'
1553         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1554         @echo  ''
1555         @echo  'Kernel selftest'
1556         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1557         @echo  '                    Build, install, and boot kernel before'
1558         @echo  '                    running kselftest on it'
1559         @echo  '  kselftest-clean - Remove all generated kselftest files'
1560         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1561         @echo  '                    .config.'
1562         @echo  ''
1563         @echo  'Kernel packaging:'
1564         @$(MAKE) $(build)=$(package-dir) help
1565         @echo  ''
1566         @echo  'Documentation targets:'
1567         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1568         @echo  ''
1569         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1570         @echo  ''
1571         @echo  'Architecture specific targets ($(SRCARCH)):'
1572         @$(if $(archhelp),$(archhelp),\
1573                 echo '  No architecture specific help defined for $(SRCARCH)')
1574         @echo  ''
1575         @$(if $(boards), \
1576                 $(foreach b, $(boards), \
1577                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1578                 echo '')
1579         @$(if $(board-dirs), \
1580                 $(foreach b, $(board-dirs), \
1581                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1582                 printf "  %-16s - Show all of the above\\n" help-boards; \
1583                 echo '')
1584
1585         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1586         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1587         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1588         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1589         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1590         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1591         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1592         @echo  '                1: warnings which may be relevant and do not occur too often'
1593         @echo  '                2: warnings which occur quite often but may still be relevant'
1594         @echo  '                3: more obscure warnings, can most likely be ignored'
1595         @echo  '                Multiple levels can be combined with W=12 or W=123'
1596         @echo  ''
1597         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1598         @echo  'For further info see the ./README file'
1599
1600
1601 help-board-dirs := $(addprefix help-,$(board-dirs))
1602
1603 help-boards: $(help-board-dirs)
1604
1605 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1606
1607 $(help-board-dirs): help-%:
1608         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1609         @$(if $(boards-per-dir), \
1610                 $(foreach b, $(boards-per-dir), \
1611                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1612                 echo '')
1613
1614
1615 # Documentation targets
1616 # ---------------------------------------------------------------------------
1617 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1618 PHONY += $(DOC_TARGETS)
1619 $(DOC_TARGETS): scripts_basic FORCE
1620         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1621         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1622         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1623
1624 else # KBUILD_EXTMOD
1625
1626 ###
1627 # External module support.
1628 # When building external modules the kernel used as basis is considered
1629 # read-only, and no consistency checks are made and the make
1630 # system is not used on the basis kernel. If updates are required
1631 # in the basis kernel ordinary make commands (without M=...) must
1632 # be used.
1633 #
1634 # The following are the only valid targets when building external
1635 # modules.
1636 # make M=dir clean     Delete all automatically generated files
1637 # make M=dir modules   Make all modules in specified dir
1638 # make M=dir           Same as 'make M=dir modules'
1639 # make M=dir modules_install
1640 #                      Install the modules built in the module directory
1641 #                      Assumes install directory is already created
1642
1643 # We are always building modules
1644 KBUILD_MODULES := 1
1645
1646 PHONY += $(objtree)/Module.symvers
1647 $(objtree)/Module.symvers:
1648         @test -e $(objtree)/Module.symvers || ( \
1649         echo; \
1650         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1651         echo "           is missing; modules will have no dependencies and modversions."; \
1652         echo )
1653
1654 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1655 PHONY += $(module-dirs) modules
1656 $(module-dirs): prepare $(objtree)/Module.symvers
1657         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1658
1659 modules: $(module-dirs)
1660         @$(kecho) '  Building modules, stage 2.';
1661         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1662
1663 PHONY += modules_install
1664 modules_install: _emodinst_ _emodinst_post
1665
1666 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1667 PHONY += _emodinst_
1668 _emodinst_:
1669         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1670         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1671
1672 PHONY += _emodinst_post
1673 _emodinst_post: _emodinst_
1674         $(call cmd,depmod)
1675
1676 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1677
1678 PHONY += $(clean-dirs) clean
1679 $(clean-dirs):
1680         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1681
1682 clean:  rm-dirs := $(MODVERDIR)
1683 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1684
1685 PHONY += help
1686 help:
1687         @echo  '  Building external modules.'
1688         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1689         @echo  ''
1690         @echo  '  modules         - default target, build the module(s)'
1691         @echo  '  modules_install - install the module'
1692         @echo  '  clean           - remove generated files in module directory only'
1693         @echo  ''
1694
1695 # Dummies...
1696 PHONY += prepare scripts
1697 prepare:
1698         $(cmd_crmodverdir)
1699 scripts: ;
1700 endif # KBUILD_EXTMOD
1701
1702 clean: $(clean-dirs)
1703         $(call cmd,rmdirs)
1704         $(call cmd,rmfiles)
1705         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1706                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1707                 -o -name '*.ko.*' \
1708                 -o -name '*.dwo'  \
1709                 -o -name '*.su'  \
1710                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1711                 -o -name '*.symtypes' -o -name 'modules.order' \
1712                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1713                 -o -name '*.c.[012]*.*' \
1714                 -o -name '*.ll' \
1715                 -o -name '*.gcno' \
1716                 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1717
1718 # Generate tags for editors
1719 # ---------------------------------------------------------------------------
1720 quiet_cmd_tags = GEN     $@
1721       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1722
1723 tags TAGS cscope gtags: FORCE
1724         $(call cmd,tags)
1725
1726 # Scripts to check various things for consistency
1727 # ---------------------------------------------------------------------------
1728
1729 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1730
1731 includecheck:
1732         find $(srctree)/* $(RCS_FIND_IGNORE) \
1733                 -name '*.[hcS]' -type f -print | sort \
1734                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1735
1736 versioncheck:
1737         find $(srctree)/* $(RCS_FIND_IGNORE) \
1738                 -name '*.[hcS]' -type f -print | sort \
1739                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1740
1741 coccicheck:
1742         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1743
1744 namespacecheck:
1745         $(PERL) $(srctree)/scripts/namespace.pl
1746
1747 export_report:
1748         $(PERL) $(srctree)/scripts/export_report.pl
1749
1750 endif #ifeq ($(config-targets),1)
1751 endif #ifeq ($(mixed-targets),1)
1752
1753 PHONY += checkstack kernelrelease kernelversion image_name
1754
1755 # UML needs a little special treatment here.  It wants to use the host
1756 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1757 # else wants $(ARCH), including people doing cross-builds, which means
1758 # that $(SUBARCH) doesn't work here.
1759 ifeq ($(ARCH), um)
1760 CHECKSTACK_ARCH := $(SUBARCH)
1761 else
1762 CHECKSTACK_ARCH := $(ARCH)
1763 endif
1764 checkstack:
1765         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1766         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1767
1768 kernelrelease:
1769         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1770
1771 kernelversion:
1772         @echo $(KERNELVERSION)
1773
1774 image_name:
1775         @echo $(KBUILD_IMAGE)
1776
1777 # Clear a bunch of variables before executing the submake
1778 tools/: FORCE
1779         $(Q)mkdir -p $(objtree)/tools
1780         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1781
1782 tools/%: FORCE
1783         $(Q)mkdir -p $(objtree)/tools
1784         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1785
1786 # Single targets
1787 # ---------------------------------------------------------------------------
1788 # Single targets are compatible with:
1789 # - build with mixed source and output
1790 # - build with separate output dir 'make O=...'
1791 # - external modules
1792 #
1793 #  target-dir => where to store outputfile
1794 #  build-dir  => directory in kernel source tree to use
1795
1796 ifeq ($(KBUILD_EXTMOD),)
1797         build-dir  = $(patsubst %/,%,$(dir $@))
1798         target-dir = $(dir $@)
1799 else
1800         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1801         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1802         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1803 endif
1804
1805 %.s: %.c prepare scripts FORCE
1806         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1807 %.i: %.c prepare scripts FORCE
1808         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1809 %.o: %.c prepare scripts FORCE
1810         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1811 %.lst: %.c prepare scripts FORCE
1812         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1813 %.s: %.S prepare scripts FORCE
1814         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1815 %.o: %.S prepare scripts FORCE
1816         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1817 %.symtypes: %.c prepare scripts FORCE
1818         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1819 %.ll: %.c prepare scripts FORCE
1820         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1821
1822 # Modules
1823 /: prepare scripts FORCE
1824         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1825         $(build)=$(build-dir)
1826 # Make sure the latest headers are built for Documentation
1827 Documentation/ samples/: headers_install
1828 %/: prepare scripts FORCE
1829         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1830         $(build)=$(build-dir)
1831 %.ko: prepare scripts FORCE
1832         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1833         $(build)=$(build-dir) $(@:.ko=.o)
1834         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1835
1836 # FIXME Should go into a make.lib or something
1837 # ===========================================================================
1838
1839 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1840       cmd_rmdirs = rm -rf $(rm-dirs)
1841
1842 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1843       cmd_rmfiles = rm -f $(rm-files)
1844
1845 # Run depmod only if we have System.map and depmod is executable
1846 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1847       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1848                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1849
1850 # Create temporary dir for module support files
1851 # clean it up only when building all modules
1852 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1853                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1854
1855 # read all saved command lines
1856
1857 targets := $(wildcard $(sort $(targets)))
1858 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1859
1860 ifneq ($(cmd_files),)
1861   $(cmd_files): ;       # Do not try to update included dependency files
1862   include $(cmd_files)
1863 endif
1864
1865 endif   # skip-makefile
1866
1867 PHONY += FORCE
1868 FORCE:
1869
1870 # Declare the contents of the .PHONY variable as phony.  We keep that
1871 # information in a variable so we can use it in if_changed and friends.
1872 .PHONY: $(PHONY)