Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 3
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc4
   6 NAME = Bobtail Squid
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub_make_done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # Kbuild will save output files in the current working directory.
 100 # This does not need to match to the root of the kernel source tree.
 101 #
 102 # For example, you can do this:
 103 #
 104 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105 #
 106 # If you want to save output files in a different location, there are
 107 # two syntaxes to specify it.
 108 #
 109 # 1) O=
 110 # Use "make O=dir/to/store/output/files/"
 111 #
 112 # 2) Set KBUILD_OUTPUT
 113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115 #
 116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117 # variable.
 118
 119 # Do we want to change the working directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 ifneq ($(KBUILD_OUTPUT),)
 125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126 # expand a shell special character '~'. We use a somewhat tedious way here.
 127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128 $(if $(abs_objtree),, \
 129      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131 # $(realpath ...) resolves symlinks
 132 abs_objtree := $(realpath $(abs_objtree))
 133 else
 134 abs_objtree := $(CURDIR)
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137 ifeq ($(abs_objtree),$(CURDIR))
 138 # Suppress "Entering directory ..." unless we are changing the work directory.
 139 MAKEFLAGS += --no-print-directory
 140 else
 141 need-sub-make := 1
 142 endif
 143
 144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147 $(error source directory cannot contain spaces or colons)
 148 endif
 149
 150 ifneq ($(abs_srctree),$(abs_objtree))
 151 # Look for make include files relative to root of kernel src
 152 #
 153 # This does not become effective immediately because MAKEFLAGS is re-parsed
 154 # once after the Makefile is read. We need to invoke sub-make.
 155 MAKEFLAGS += --include-dir=$(abs_srctree)
 156 need-sub-make := 1
 157 endif
 158
 159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162 need-sub-make := 1
 163 # Cancel implicit rules for this Makefile.
 164 $(lastword $(MAKEFILE_LIST)): ;
 165 endif
 166
 167 export abs_srctree abs_objtree
 168 export sub_make_done := 1
 169
 170 ifeq ($(need-sub-make),1)
 171
 172 PHONY += $(MAKECMDGOALS) sub-make
 173
 174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175         @:
 176
 177 # Invoke a second make in the output directory, passing relevant variables
 178 sub-make:
 179         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181 endif # need-sub-make
 182 endif # sub_make_done
 183
 184 # We process the rest of the Makefile if this is the final invocation of make
 185 ifeq ($(need-sub-make),)
 186
 187 # Do not print "Entering directory ...",
 188 # but we want to display it when entering to the output directory
 189 # so that IDEs/editors are able to understand relative filenames.
 190 MAKEFLAGS += --no-print-directory
 191
 192 # Call a source code checker (by default, "sparse") as part of the
 193 # C compilation.
 194 #
 195 # Use 'make C=1' to enable checking of only re-compiled files.
 196 # Use 'make C=2' to enable checking of *all* source files, regardless
 197 # of whether they are re-compiled or not.
 198 #
 199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 200 # including where to get the "sparse" utility.
 201
 202 ifeq ("$(origin C)", "command line")
 203   KBUILD_CHECKSRC = $(C)
 204 endif
 205 ifndef KBUILD_CHECKSRC
 206   KBUILD_CHECKSRC = 0
 207 endif
 208
 209 # Use make M=dir to specify directory of external module to build
 210 # Old syntax make ... SUBDIRS=$PWD is still supported
 211 # Setting the environment variable KBUILD_EXTMOD take precedence
 212 ifdef SUBDIRS
 213   $(warning ================= WARNING ================)
 214   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 215   $(warning )
 216   $(warning If you are building an individual subdirectory)
 217   $(warning in the kernel tree, you can do like this:)
 218   $(warning $$ make path/to/dir/you/want/to/build/)
 219   $(warning (Do not forget the trailing slash))
 220   $(warning )
 221   $(warning If you are building an external module,)
 222   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 223   $(warning ==========================================)
 224   KBUILD_EXTMOD ?= $(SUBDIRS)
 225 endif
 226
 227 ifeq ("$(origin M)", "command line")
 228   KBUILD_EXTMOD := $(M)
 229 endif
 230
 231 export KBUILD_CHECKSRC KBUILD_EXTMOD
 232
 233 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 234
 235 ifeq ($(abs_srctree),$(abs_objtree))
 236         # building in the source tree
 237         srctree := .
 238         building_out_of_srctree :=
 239 else
 240         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 241                 # building in a subdirectory of the source tree
 242                 srctree := ..
 243         else
 244                 srctree := $(abs_srctree)
 245         endif
 246         building_out_of_srctree := 1
 247 endif
 248
 249 ifneq ($(KBUILD_ABS_SRCTREE),)
 250 srctree := $(abs_srctree)
 251 endif
 252
 253 objtree         := .
 254 VPATH           := $(srctree)
 255
 256 export building_out_of_srctree srctree objtree VPATH
 257
 258 # To make sure we do not include .config for any of the *config targets
 259 # catch them early, and hand them over to scripts/kconfig/Makefile
 260 # It is allowed to specify more targets when calling make, including
 261 # mixing *config targets and build targets.
 262 # For example 'make oldconfig all'.
 263 # Detect when mixed targets is specified, and make a second invocation
 264 # of make so .config is not included in this case either (for *config).
 265
 266 version_h := include/generated/uapi/linux/version.h
 267 old_version_h := include/linux/version.h
 268
 269 clean-targets := %clean mrproper cleandocs
 270 no-dot-config-targets := $(clean-targets) \
 271                          cscope gtags TAGS tags help% %docs check% coccicheck \
 272                          $(version_h) headers headers_% archheaders archscripts \
 273                          %asm-generic kernelversion %src-pkg
 274 no-sync-config-targets := $(no-dot-config-targets) install %install \
 275                            kernelrelease
 276 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 277
 278 config-build    :=
 279 mixed-build     :=
 280 need-config     := 1
 281 may-sync-config := 1
 282 single-build    :=
 283
 284 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 285         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 286                 need-config :=
 287         endif
 288 endif
 289
 290 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 291         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 292                 may-sync-config :=
 293         endif
 294 endif
 295
 296 ifneq ($(KBUILD_EXTMOD),)
 297         may-sync-config :=
 298 endif
 299
 300 ifeq ($(KBUILD_EXTMOD),)
 301         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 302                 config-build := 1
 303                 ifneq ($(words $(MAKECMDGOALS)),1)
 304                         mixed-build := 1
 305                 endif
 306         endif
 307 endif
 308
 309 # We cannot build single targets and the others at the same time
 310 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 311         single-build := 1
 312         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 313                 mixed-build := 1
 314         endif
 315 endif
 316
 317 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 318 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 319         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 320                 mixed-build := 1
 321         endif
 322 endif
 323
 324 # install and modules_install need also be processed one by one
 325 ifneq ($(filter install,$(MAKECMDGOALS)),)
 326         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 327                 mixed-build := 1
 328         endif
 329 endif
 330
 331 ifdef mixed-build
 332 # ===========================================================================
 333 # We're called with mixed targets (*config and build targets).
 334 # Handle them one by one.
 335
 336 PHONY += $(MAKECMDGOALS) __build_one_by_one
 337
 338 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 339         @:
 340
 341 __build_one_by_one:
 342         $(Q)set -e; \
 343         for i in $(MAKECMDGOALS); do \
 344                 $(MAKE) -f $(srctree)/Makefile $$i; \
 345         done
 346
 347 else # !mixed-build
 348
 349 include scripts/Kbuild.include
 350
 351 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 352 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 353 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 354 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 355
 356 include scripts/subarch.include
 357
 358 # Cross compiling and selecting different set of gcc/bin-utils
 359 # ---------------------------------------------------------------------------
 360 #
 361 # When performing cross compilation for other architectures ARCH shall be set
 362 # to the target architecture. (See arch/* for the possibilities).
 363 # ARCH can be set during invocation of make:
 364 # make ARCH=ia64
 365 # Another way is to have ARCH set in the environment.
 366 # The default ARCH is the host where make is executed.
 367
 368 # CROSS_COMPILE specify the prefix used for all executables used
 369 # during compilation. Only gcc and related bin-utils executables
 370 # are prefixed with $(CROSS_COMPILE).
 371 # CROSS_COMPILE can be set on the command line
 372 # make CROSS_COMPILE=ia64-linux-
 373 # Alternatively CROSS_COMPILE can be set in the environment.
 374 # Default value for CROSS_COMPILE is not to prefix executables
 375 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 376 ARCH            ?= $(SUBARCH)
 377
 378 # Architecture as present in compile.h
 379 UTS_MACHINE     := $(ARCH)
 380 SRCARCH         := $(ARCH)
 381
 382 # Additional ARCH settings for x86
 383 ifeq ($(ARCH),i386)
 384         SRCARCH := x86
 385 endif
 386 ifeq ($(ARCH),x86_64)
 387         SRCARCH := x86
 388 endif
 389
 390 # Additional ARCH settings for sparc
 391 ifeq ($(ARCH),sparc32)
 392        SRCARCH := sparc
 393 endif
 394 ifeq ($(ARCH),sparc64)
 395        SRCARCH := sparc
 396 endif
 397
 398 # Additional ARCH settings for sh
 399 ifeq ($(ARCH),sh64)
 400        SRCARCH := sh
 401 endif
 402
 403 KCONFIG_CONFIG  ?= .config
 404 export KCONFIG_CONFIG
 405
 406 # SHELL used by kbuild
 407 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 408           else if [ -x /bin/bash ]; then echo /bin/bash; \
 409           else echo sh; fi ; fi)
 410
 411 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 412 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 413 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 414
 415 HOSTCC       = gcc
 416 HOSTCXX      = g++
 417 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 418                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 419                 $(HOSTCFLAGS)
 420 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 421 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 422 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 423
 424 # Make variables (CC, etc...)
 425 AS              = $(CROSS_COMPILE)as
 426 LD              = $(CROSS_COMPILE)ld
 427 CC              = $(CROSS_COMPILE)gcc
 428 CPP             = $(CC) -E
 429 AR              = $(CROSS_COMPILE)ar
 430 NM              = $(CROSS_COMPILE)nm
 431 STRIP           = $(CROSS_COMPILE)strip
 432 OBJCOPY         = $(CROSS_COMPILE)objcopy
 433 OBJDUMP         = $(CROSS_COMPILE)objdump
 434 OBJSIZE         = $(CROSS_COMPILE)size
 435 PAHOLE          = pahole
 436 LEX             = flex
 437 YACC            = bison
 438 AWK             = awk
 439 INSTALLKERNEL  := installkernel
 440 DEPMOD          = /sbin/depmod
 441 PERL            = perl
 442 PYTHON          = python
 443 PYTHON2         = python2
 444 PYTHON3         = python3
 445 CHECK           = sparse
 446
 447 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 448                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 449 NOSTDINC_FLAGS :=
 450 CFLAGS_MODULE   =
 451 AFLAGS_MODULE   =
 452 LDFLAGS_MODULE  =
 453 CFLAGS_KERNEL   =
 454 AFLAGS_KERNEL   =
 455 LDFLAGS_vmlinux =
 456
 457 # Use USERINCLUDE when you must reference the UAPI directories only.
 458 USERINCLUDE    := \
 459                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 460                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 461                 -I$(srctree)/include/uapi \
 462                 -I$(objtree)/include/generated/uapi \
 463                 -include $(srctree)/include/linux/kconfig.h
 464
 465 # Use LINUXINCLUDE when you must reference the include/ directory.
 466 # Needed to be compatible with the O= option
 467 LINUXINCLUDE    := \
 468                 -I$(srctree)/arch/$(SRCARCH)/include \
 469                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 470                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 471                 -I$(objtree)/include \
 472                 $(USERINCLUDE)
 473
 474 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 475 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 476                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 477                    -Werror=implicit-function-declaration -Werror=implicit-int \
 478                    -Wno-format-security \
 479                    -std=gnu89
 480 KBUILD_CPPFLAGS := -D__KERNEL__
 481 KBUILD_AFLAGS_KERNEL :=
 482 KBUILD_CFLAGS_KERNEL :=
 483 KBUILD_AFLAGS_MODULE  := -DMODULE
 484 KBUILD_CFLAGS_MODULE  := -DMODULE
 485 KBUILD_LDFLAGS_MODULE :=
 486 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 487 KBUILD_LDFLAGS :=
 488 GCC_PLUGINS_CFLAGS :=
 489 CLANG_FLAGS :=
 490
 491 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 492 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 493 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 494 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 495
 496 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 497 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 498 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 499 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 500 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 501 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 502 export KBUILD_ARFLAGS
 503
 504 # Files to ignore in find ... statements
 505
 506 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 507                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 508                           -prune -o
 509 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 510                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 511
 512 # ===========================================================================
 513 # Rules shared between *config targets and build targets
 514
 515 # Basic helpers built in scripts/basic/
 516 PHONY += scripts_basic
 517 scripts_basic:
 518         $(Q)$(MAKE) $(build)=scripts/basic
 519         $(Q)rm -f .tmp_quiet_recordmcount
 520
 521 PHONY += outputmakefile
 522 # outputmakefile generates a Makefile in the output directory, if using a
 523 # separate output directory. This allows convenient use of make in the
 524 # output directory.
 525 # At the same time when output Makefile generated, generate .gitignore to
 526 # ignore whole output directory
 527 outputmakefile:
 528 ifdef building_out_of_srctree
 529         $(Q)ln -fsn $(srctree) source
 530         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 531         $(Q)test -e .gitignore || \
 532         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 533 endif
 534
 535 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 536 ifneq ($(CROSS_COMPILE),)
 537 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 538 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 539 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 540 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 541 endif
 542 ifneq ($(GCC_TOOLCHAIN),)
 543 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 544 endif
 545 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 546 CLANG_FLAGS     += -no-integrated-as
 547 endif
 548 CLANG_FLAGS     += -Werror=unknown-warning-option
 549 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 550 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 551 export CLANG_FLAGS
 552 endif
 553
 554 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 555 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 556 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 557 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 558 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 559
 560 ifdef config-build
 561 # ===========================================================================
 562 # *config targets only - make sure prerequisites are updated, and descend
 563 # in scripts/kconfig to make the *config target
 564
 565 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 566 # KBUILD_DEFCONFIG may point out an alternative default configuration
 567 # used for 'make defconfig'
 568 include arch/$(SRCARCH)/Makefile
 569 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 570
 571 config: scripts_basic outputmakefile FORCE
 572         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 573
 574 %config: scripts_basic outputmakefile FORCE
 575         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 576
 577 else #!config-build
 578 # ===========================================================================
 579 # Build targets only - this includes vmlinux, arch specific targets, clean
 580 # targets and others. In general all targets except *config targets.
 581
 582 # If building an external module we do not care about the all: rule
 583 # but instead _all depend on modules
 584 PHONY += all
 585 ifeq ($(KBUILD_EXTMOD),)
 586 _all: all
 587 else
 588 _all: modules
 589 endif
 590
 591 # Decide whether to build built-in, modular, or both.
 592 # Normally, just do built-in.
 593
 594 KBUILD_MODULES :=
 595 KBUILD_BUILTIN := 1
 596
 597 # If we have only "make modules", don't compile built-in objects.
 598 # When we're building modules with modversions, we need to consider
 599 # the built-in objects during the descend as well, in order to
 600 # make sure the checksums are up to date before we record them.
 601
 602 ifeq ($(MAKECMDGOALS),modules)
 603   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 604 endif
 605
 606 # If we have "make <whatever> modules", compile modules
 607 # in addition to whatever we do anyway.
 608 # Just "make" or "make all" shall build modules as well
 609
 610 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 611   KBUILD_MODULES := 1
 612 endif
 613
 614 ifeq ($(MAKECMDGOALS),)
 615   KBUILD_MODULES := 1
 616 endif
 617
 618 export KBUILD_MODULES KBUILD_BUILTIN
 619
 620 ifdef need-config
 621 include include/config/auto.conf
 622 endif
 623
 624 ifeq ($(KBUILD_EXTMOD),)
 625 # Objects we will link into vmlinux / subdirs we need to visit
 626 init-y          := init/
 627 drivers-y       := drivers/ sound/
 628 drivers-$(CONFIG_SAMPLES) += samples/
 629 drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
 630 net-y           := net/
 631 libs-y          := lib/
 632 core-y          := usr/
 633 virt-y          := virt/
 634 endif # KBUILD_EXTMOD
 635
 636 # The all: target is the default when no target is given on the
 637 # command line.
 638 # This allow a user to issue only 'make' to build a kernel including modules
 639 # Defaults to vmlinux, but the arch makefile usually adds further targets
 640 all: vmlinux
 641
 642 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 643         $(call cc-option,-fno-tree-loop-im) \
 644         $(call cc-disable-warning,maybe-uninitialized,)
 645 export CFLAGS_GCOV
 646
 647 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 648 ifdef CONFIG_FUNCTION_TRACER
 649   CC_FLAGS_FTRACE := -pg
 650 endif
 651
 652 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 653 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 654 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 655 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 656 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 657 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 658 export RETPOLINE_CFLAGS
 659 export RETPOLINE_VDSO_CFLAGS
 660
 661 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 662 # values of the respective KBUILD_* variables
 663 ARCH_CPPFLAGS :=
 664 ARCH_AFLAGS :=
 665 ARCH_CFLAGS :=
 666 include arch/$(SRCARCH)/Makefile
 667
 668 ifdef need-config
 669 ifdef may-sync-config
 670 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 671 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 672 # because some architectures define CROSS_COMPILE there.
 673 include include/config/auto.conf.cmd
 674
 675 $(KCONFIG_CONFIG):
 676         @echo >&2 '***'
 677         @echo >&2 '*** Configuration file "$@" not found!'
 678         @echo >&2 '***'
 679         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 680         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 681         @echo >&2 '***'
 682         @/bin/false
 683
 684 # The actual configuration files used during the build are stored in
 685 # include/generated/ and include/config/. Update them if .config is newer than
 686 # include/config/auto.conf (which mirrors .config).
 687 #
 688 # This exploits the 'multi-target pattern rule' trick.
 689 # The syncconfig should be executed only once to make all the targets.
 690 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 691         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 692 else # !may-sync-config
 693 # External modules and some install targets need include/generated/autoconf.h
 694 # and include/config/auto.conf but do not care if they are up-to-date.
 695 # Use auto.conf to trigger the test
 696 PHONY += include/config/auto.conf
 697
 698 include/config/auto.conf:
 699         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 700         echo >&2;                                                       \
 701         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 702         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 703         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 704         echo >&2 ;                                                      \
 705         /bin/false)
 706
 707 endif # may-sync-config
 708 endif # need-config
 709
 710 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 711 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 712 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 713 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 714 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 715
 716 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 717 KBUILD_CFLAGS   += -Os
 718 else
 719 KBUILD_CFLAGS   += -O2
 720 endif
 721
 722 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 723 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 724 endif
 725
 726 # Tell gcc to never replace conditional load with a non-conditional one
 727 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 728
 729 include scripts/Makefile.kcov
 730 include scripts/Makefile.gcc-plugins
 731
 732 ifdef CONFIG_READABLE_ASM
 733 # Disable optimizations that make assembler listings hard to read.
 734 # reorder blocks reorders the control in the function
 735 # ipa clone creates specialized cloned functions
 736 # partial inlining inlines only parts of functions
 737 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 738                  $(call cc-option,-fno-ipa-cp-clone,) \
 739                  $(call cc-option,-fno-partial-inlining)
 740 endif
 741
 742 ifneq ($(CONFIG_FRAME_WARN),0)
 743 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 744 endif
 745
 746 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 747 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 748 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 749
 750 KBUILD_CFLAGS += $(stackp-flags-y)
 751
 752 ifdef CONFIG_CC_IS_CLANG
 753 KBUILD_CPPFLAGS += -Qunused-arguments
 754 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 755 KBUILD_CFLAGS += -Wno-gnu
 756 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 757 KBUILD_CFLAGS += -Wno-tautological-compare
 758 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 759 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 760 # See modpost pattern 2
 761 KBUILD_CFLAGS += -mno-global-merge
 762 else
 763
 764 # These warnings generated too much noise in a regular build.
 765 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 766 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 767 endif
 768
 769 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 770 ifdef CONFIG_FRAME_POINTER
 771 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 772 else
 773 # Some targets (ARM with Thumb2, for example), can't be built with frame
 774 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 775 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 776 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 777 # -fomit-frame-pointer with FUNCTION_TRACER.
 778 ifndef CONFIG_FUNCTION_TRACER
 779 KBUILD_CFLAGS   += -fomit-frame-pointer
 780 endif
 781 endif
 782
 783 # Initialize all stack variables with a pattern, if desired.
 784 ifdef CONFIG_INIT_STACK_ALL
 785 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 786 endif
 787
 788 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 789
 790 ifdef CONFIG_DEBUG_INFO
 791 ifdef CONFIG_DEBUG_INFO_SPLIT
 792 DEBUG_CFLAGS    += -gsplit-dwarf
 793 else
 794 DEBUG_CFLAGS    += -g
 795 endif
 796 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 797 endif
 798 ifdef CONFIG_DEBUG_INFO_DWARF4
 799 DEBUG_CFLAGS    += -gdwarf-4
 800 endif
 801
 802 ifdef CONFIG_DEBUG_INFO_REDUCED
 803 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 804                    $(call cc-option,-fno-var-tracking)
 805 endif
 806
 807 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 808 export DEBUG_CFLAGS
 809
 810 ifdef CONFIG_FUNCTION_TRACER
 811 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 812   # gcc 5 supports generating the mcount tables directly
 813   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 814     CC_FLAGS_FTRACE     += -mrecord-mcount
 815     export CC_USING_RECORD_MCOUNT := 1
 816   endif
 817   ifdef CONFIG_HAVE_NOP_MCOUNT
 818     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 819       CC_FLAGS_FTRACE   += -mnop-mcount
 820       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 821     endif
 822   endif
 823 endif
 824 ifdef CONFIG_HAVE_FENTRY
 825   ifeq ($(call cc-option-yn, -mfentry),y)
 826     CC_FLAGS_FTRACE     += -mfentry
 827     CC_FLAGS_USING      += -DCC_USING_FENTRY
 828   endif
 829 endif
 830 export CC_FLAGS_FTRACE
 831 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 832 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 833 ifdef CONFIG_DYNAMIC_FTRACE
 834         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 835                 BUILD_C_RECORDMCOUNT := y
 836                 export BUILD_C_RECORDMCOUNT
 837         endif
 838 endif
 839 endif
 840
 841 # We trigger additional mismatches with less inlining
 842 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 843 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 844 endif
 845
 846 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 847 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 848 LDFLAGS_vmlinux += --gc-sections
 849 endif
 850
 851 ifdef CONFIG_LIVEPATCH
 852 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 853 endif
 854
 855 # arch Makefile may override CC so keep this after arch Makefile is included
 856 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 857
 858 # warn about C99 declaration after statement
 859 KBUILD_CFLAGS += -Wdeclaration-after-statement
 860
 861 # Warn about unmarked fall-throughs in switch statement.
 862 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 863
 864 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 865 KBUILD_CFLAGS += -Wvla
 866
 867 # disable pointer signed / unsigned warnings in gcc 4.0
 868 KBUILD_CFLAGS += -Wno-pointer-sign
 869
 870 # disable stringop warnings in gcc 8+
 871 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 872
 873 # disable invalid "can't wrap" optimizations for signed / pointers
 874 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 875
 876 # clang sets -fmerge-all-constants by default as optimization, but this
 877 # is non-conforming behavior for C and in fact breaks the kernel, so we
 878 # need to disable it here generally.
 879 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 880
 881 # for gcc -fno-merge-all-constants disables everything, but it is fine
 882 # to have actual conforming behavior enabled.
 883 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 884
 885 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 886 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 887
 888 # conserve stack if available
 889 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 890
 891 # Prohibit date/time macros, which would make the build non-deterministic
 892 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 893
 894 # enforce correct pointer usage
 895 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 896
 897 # Require designated initializers for all marked structures
 898 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 899
 900 # change __FILE__ to the relative path from the srctree
 901 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 902
 903 # ensure -fcf-protection is disabled when using retpoline as it is
 904 # incompatible with -mindirect-branch=thunk-extern
 905 ifdef CONFIG_RETPOLINE
 906 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 907 endif
 908
 909 # use the deterministic mode of AR if available
 910 KBUILD_ARFLAGS := $(call ar-option,D)
 911
 912 include scripts/Makefile.kasan
 913 include scripts/Makefile.extrawarn
 914 include scripts/Makefile.ubsan
 915
 916 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 917 # last assignments
 918 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 919 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 920 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 921
 922 KBUILD_LDFLAGS_MODULE += --build-id
 923 LDFLAGS_vmlinux += --build-id
 924
 925 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 926 LDFLAGS_vmlinux += $(call ld-option, -X,)
 927 endif
 928
 929 # insure the checker run with the right endianness
 930 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 931
 932 # the checker needs the correct machine size
 933 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 934
 935 # Default kernel image to build when no specific target is given.
 936 # KBUILD_IMAGE may be overruled on the command line or
 937 # set in the environment
 938 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 939 # this default value
 940 export KBUILD_IMAGE ?= vmlinux
 941
 942 #
 943 # INSTALL_PATH specifies where to place the updated kernel and system map
 944 # images. Default is /boot, but you can set it to other values
 945 export  INSTALL_PATH ?= /boot
 946
 947 #
 948 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 949 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 950 # an argument if needed. Otherwise it defaults to the kernel install path
 951 #
 952 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 953
 954 #
 955 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 956 # relocations required by build roots.  This is not defined in the
 957 # makefile but the argument can be passed to make if needed.
 958 #
 959
 960 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 961 export MODLIB
 962
 963 #
 964 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 965 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 966 # the default option --strip-debug will be used.  Otherwise,
 967 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 968
 969 ifdef INSTALL_MOD_STRIP
 970 ifeq ($(INSTALL_MOD_STRIP),1)
 971 mod_strip_cmd = $(STRIP) --strip-debug
 972 else
 973 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 974 endif # INSTALL_MOD_STRIP=1
 975 else
 976 mod_strip_cmd = true
 977 endif # INSTALL_MOD_STRIP
 978 export mod_strip_cmd
 979
 980 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 981 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 982 # or CONFIG_MODULE_COMPRESS_XZ.
 983
 984 mod_compress_cmd = true
 985 ifdef CONFIG_MODULE_COMPRESS
 986   ifdef CONFIG_MODULE_COMPRESS_GZIP
 987     mod_compress_cmd = gzip -n -f
 988   endif # CONFIG_MODULE_COMPRESS_GZIP
 989   ifdef CONFIG_MODULE_COMPRESS_XZ
 990     mod_compress_cmd = xz -f
 991   endif # CONFIG_MODULE_COMPRESS_XZ
 992 endif # CONFIG_MODULE_COMPRESS
 993 export mod_compress_cmd
 994
 995 ifdef CONFIG_MODULE_SIG_ALL
 996 $(eval $(call config_filename,MODULE_SIG_KEY))
 997
 998 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 999 else
1000 mod_sign_cmd = true
1001 endif
1002 export mod_sign_cmd
1003
1004 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1005
1006 ifdef CONFIG_STACK_VALIDATION
1007   has_libelf := $(call try-run,\
1008                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1009   ifeq ($(has_libelf),1)
1010     objtool_target := tools/objtool FORCE
1011   else
1012     SKIP_STACK_VALIDATION := 1
1013     export SKIP_STACK_VALIDATION
1014   endif
1015 endif
1016
1017 PHONY += prepare0
1018
1019 export MODORDER := $(extmod-prefix)modules.order
1020
1021 ifeq ($(KBUILD_EXTMOD),)
1022 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1023
1024 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1025                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1026                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1027
1028 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1029                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1030                         $(drivers-) $(net-) $(libs-) $(virt-))))
1031
1032 build-dirs      := $(vmlinux-dirs)
1033 clean-dirs      := $(vmlinux-alldirs)
1034
1035 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1036 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1037 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1038 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1039 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1040 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1041 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1042
1043 # Externally visible symbols (used by link-vmlinux.sh)
1044 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1045                               $(drivers-y) $(net-y) $(virt-y)
1046 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1047 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1048 export LDFLAGS_vmlinux
1049 # used by scripts/package/Makefile
1050 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1051
1052 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1053
1054 # Recurse until adjust_autoksyms.sh is satisfied
1055 PHONY += autoksyms_recursive
1056 ifdef CONFIG_TRIM_UNUSED_KSYMS
1057 autoksyms_recursive: descend modules.order
1058         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1059           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1060 endif
1061
1062 # For the kernel to actually contain only the needed exported symbols,
1063 # we have to build modules as well to determine what those symbols are.
1064 # (this can be evaluated only once include/config/auto.conf has been included)
1065 ifdef CONFIG_TRIM_UNUSED_KSYMS
1066   KBUILD_MODULES := 1
1067 endif
1068
1069 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1070
1071 $(autoksyms_h):
1072         $(Q)mkdir -p $(dir $@)
1073         $(Q)touch $@
1074
1075 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1076
1077 # Final link of vmlinux with optional arch pass after final link
1078 cmd_link-vmlinux =                                                 \
1079         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1080         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1081
1082 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1083         +$(call if_changed,link-vmlinux)
1084
1085 targets := vmlinux
1086
1087 # The actual objects are generated when descending,
1088 # make sure no implicit rule kicks in
1089 $(sort $(vmlinux-deps)): descend ;
1090
1091 filechk_kernel.release = \
1092         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1093
1094 # Store (new) KERNELRELEASE string in include/config/kernel.release
1095 include/config/kernel.release: FORCE
1096         $(call filechk,kernel.release)
1097
1098 # Additional helpers built in scripts/
1099 # Carefully list dependencies so we do not try to build scripts twice
1100 # in parallel
1101 PHONY += scripts
1102 scripts: scripts_basic scripts_dtc
1103         $(Q)$(MAKE) $(build)=$(@)
1104
1105 # Things we need to do before we recursively start building the kernel
1106 # or the modules are listed in "prepare".
1107 # A multi level approach is used. prepareN is processed before prepareN-1.
1108 # archprepare is used in arch Makefiles and when processed asm symlink,
1109 # version.h and scripts_basic is processed / created.
1110
1111 PHONY += prepare archprepare prepare3
1112
1113 # prepare3 is used to check if we are building in a separate output directory,
1114 # and if so do:
1115 # 1) Check that make has not been executed in the kernel src $(srctree)
1116 prepare3: include/config/kernel.release
1117 ifdef building_out_of_srctree
1118         $(Q)if [ -f $(srctree)/.config -o \
1119                  -d $(srctree)/include/config -o \
1120                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1121                 echo >&2 "***"; \
1122                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
1123                 echo >&2 "*** in $(abs_srctree)";\
1124                 echo >&2 "***"; \
1125                 /bin/false; \
1126         fi;
1127 endif
1128
1129 archprepare: archheaders archscripts scripts prepare3 outputmakefile \
1130         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1131
1132 prepare0: archprepare
1133         $(Q)$(MAKE) $(build)=scripts/mod
1134         $(Q)$(MAKE) $(build)=.
1135
1136 # All the preparing..
1137 prepare: prepare0 prepare-objtool
1138
1139 # Support for using generic headers in asm-generic
1140 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1141
1142 PHONY += asm-generic uapi-asm-generic
1143 asm-generic: uapi-asm-generic
1144         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1145         generic=include/asm-generic
1146 uapi-asm-generic:
1147         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1148         generic=include/uapi/asm-generic
1149
1150 PHONY += prepare-objtool
1151 prepare-objtool: $(objtool_target)
1152 ifeq ($(SKIP_STACK_VALIDATION),1)
1153 ifdef CONFIG_UNWINDER_ORC
1154         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1155         @false
1156 else
1157         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1158 endif
1159 endif
1160
1161 # Generate some files
1162 # ---------------------------------------------------------------------------
1163
1164 # KERNELRELEASE can change from a few different places, meaning version.h
1165 # needs to be updated, so this check is forced on all builds
1166
1167 uts_len := 64
1168 define filechk_utsrelease.h
1169         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1170           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1171           exit 1;                                                         \
1172         fi;                                                               \
1173         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1174 endef
1175
1176 define filechk_version.h
1177         echo \#define LINUX_VERSION_CODE $(shell                         \
1178         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1179         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1180 endef
1181
1182 $(version_h): FORCE
1183         $(call filechk,version.h)
1184         $(Q)rm -f $(old_version_h)
1185
1186 include/generated/utsrelease.h: include/config/kernel.release FORCE
1187         $(call filechk,utsrelease.h)
1188
1189 PHONY += headerdep
1190 headerdep:
1191         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1192         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1193
1194 # ---------------------------------------------------------------------------
1195 # Kernel headers
1196
1197 #Default location for installed headers
1198 export INSTALL_HDR_PATH = $(objtree)/usr
1199
1200 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1201       cmd_headers_install = \
1202         mkdir -p $(INSTALL_HDR_PATH); \
1203         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1204         usr/include $(INSTALL_HDR_PATH)
1205
1206 PHONY += headers_install
1207 headers_install: headers
1208         $(call cmd,headers_install)
1209
1210 PHONY += archheaders archscripts
1211
1212 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1213
1214 PHONY += headers
1215 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1216         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1217           $(error Headers not exportable for the $(SRCARCH) architecture))
1218         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1219         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1220
1221 PHONY += headers_check
1222 headers_check: headers
1223         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1224         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1225
1226 ifdef CONFIG_HEADERS_INSTALL
1227 prepare: headers
1228 endif
1229
1230 ifdef CONFIG_HEADERS_CHECK
1231 all: headers_check
1232 endif
1233
1234 PHONY += scripts_unifdef
1235 scripts_unifdef: scripts_basic
1236         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1237
1238 # ---------------------------------------------------------------------------
1239 # Kernel selftest
1240
1241 PHONY += kselftest
1242 kselftest:
1243         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1244
1245 PHONY += kselftest-clean
1246 kselftest-clean:
1247         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1248
1249 PHONY += kselftest-merge
1250 kselftest-merge:
1251         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1252         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1253                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1254         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1255
1256 # ---------------------------------------------------------------------------
1257 # Devicetree files
1258
1259 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1260 dtstree := arch/$(SRCARCH)/boot/dts
1261 endif
1262
1263 ifneq ($(dtstree),)
1264
1265 %.dtb: prepare3 scripts_dtc
1266         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1267
1268 PHONY += dtbs dtbs_install dt_binding_check
1269 dtbs dtbs_check: prepare3 scripts_dtc
1270         $(Q)$(MAKE) $(build)=$(dtstree)
1271
1272 dtbs_check: export CHECK_DTBS=1
1273 dtbs_check: dt_binding_check
1274
1275 dtbs_install:
1276         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1277
1278 ifdef CONFIG_OF_EARLY_FLATTREE
1279 all: dtbs
1280 endif
1281
1282 endif
1283
1284 PHONY += scripts_dtc
1285 scripts_dtc: scripts_basic
1286         $(Q)$(MAKE) $(build)=scripts/dtc
1287
1288 dt_binding_check: scripts_dtc
1289         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1290
1291 # ---------------------------------------------------------------------------
1292 # Modules
1293
1294 ifdef CONFIG_MODULES
1295
1296 # By default, build modules as well
1297
1298 all: modules
1299
1300 # Build modules
1301 #
1302 # A module can be listed more than once in obj-m resulting in
1303 # duplicate lines in modules.order files.  Those are removed
1304 # using awk while concatenating to the final file.
1305
1306 PHONY += modules
1307 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1308         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1309         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1310
1311 modules.order: descend
1312         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1313
1314 modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1315
1316 modules.builtin: $(modbuiltin-dirs)
1317         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1318
1319 PHONY += $(modbuiltin-dirs)
1320 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1321 # here to make it self-healing in case somebody accidentally removes it.
1322 $(modbuiltin-dirs): include/config/tristate.conf
1323         $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1324
1325 # Target to prepare building external modules
1326 PHONY += modules_prepare
1327 modules_prepare: prepare
1328
1329 # Target to install modules
1330 PHONY += modules_install
1331 modules_install: _modinst_ _modinst_post
1332
1333 PHONY += _modinst_
1334 _modinst_:
1335         @rm -rf $(MODLIB)/kernel
1336         @rm -f $(MODLIB)/source
1337         @mkdir -p $(MODLIB)/kernel
1338         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1339         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1340                 rm -f $(MODLIB)/build ; \
1341                 ln -s $(CURDIR) $(MODLIB)/build ; \
1342         fi
1343         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1344         @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1345         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1346         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1347
1348 # This depmod is only for convenience to give the initial
1349 # boot a modules.dep even before / is mounted read-write.  However the
1350 # boot script depmod is the master version.
1351 PHONY += _modinst_post
1352 _modinst_post: _modinst_
1353         $(call cmd,depmod)
1354
1355 ifeq ($(CONFIG_MODULE_SIG), y)
1356 PHONY += modules_sign
1357 modules_sign:
1358         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1359 endif
1360
1361 else # CONFIG_MODULES
1362
1363 # Modules not configured
1364 # ---------------------------------------------------------------------------
1365
1366 PHONY += modules modules_install
1367 modules modules_install:
1368         @echo >&2
1369         @echo >&2 "The present kernel configuration has modules disabled."
1370         @echo >&2 "Type 'make config' and enable loadable module support."
1371         @echo >&2 "Then build a kernel with module support enabled."
1372         @echo >&2
1373         @exit 1
1374
1375 endif # CONFIG_MODULES
1376
1377 ###
1378 # Cleaning is done on three levels.
1379 # make clean     Delete most generated files
1380 #                Leave enough to build external modules
1381 # make mrproper  Delete the current configuration, and all generated files
1382 # make distclean Remove editor backup files, patch leftover files and the like
1383
1384 # Directories & files removed with 'make clean'
1385 CLEAN_DIRS  += include/ksym
1386 CLEAN_FILES += modules.builtin.modinfo
1387
1388 # Directories & files removed with 'make mrproper'
1389 MRPROPER_DIRS  += include/config include/generated          \
1390                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1391                   debian/ snap/ tar-install/
1392 MRPROPER_FILES += .config .config.old .version \
1393                   Module.symvers \
1394                   signing_key.pem signing_key.priv signing_key.x509     \
1395                   x509.genkey extra_certificates signing_key.x509.keyid \
1396                   signing_key.x509.signer vmlinux-gdb.py \
1397                   *.spec
1398
1399 # Directories & files removed with 'make distclean'
1400 DISTCLEAN_DIRS  +=
1401 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1402
1403 # clean - Delete most, but leave enough to build external modules
1404 #
1405 clean: rm-dirs  := $(CLEAN_DIRS)
1406 clean: rm-files := $(CLEAN_FILES)
1407
1408 PHONY += archclean vmlinuxclean
1409
1410 vmlinuxclean:
1411         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1412         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1413
1414 clean: archclean vmlinuxclean
1415
1416 # mrproper - Delete all generated files, including .config
1417 #
1418 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1419 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1420 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1421
1422 PHONY += $(mrproper-dirs) mrproper
1423 $(mrproper-dirs):
1424         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1425
1426 mrproper: clean $(mrproper-dirs)
1427         $(call cmd,rmdirs)
1428         $(call cmd,rmfiles)
1429
1430 # distclean
1431 #
1432 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1433 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1434
1435 PHONY += distclean
1436
1437 distclean: mrproper
1438         $(call cmd,rmdirs)
1439         $(call cmd,rmfiles)
1440         @find $(srctree) $(RCS_FIND_IGNORE) \
1441                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1442                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1443                 -o -name 'core' \) \
1444                 -type f -print | xargs rm -f
1445
1446
1447 # Packaging of the kernel to various formats
1448 # ---------------------------------------------------------------------------
1449
1450 %src-pkg: FORCE
1451         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1452 %pkg: include/config/kernel.release FORCE
1453         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1454
1455 # Brief documentation of the typical targets used
1456 # ---------------------------------------------------------------------------
1457
1458 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1459 boards := $(sort $(notdir $(boards)))
1460 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1461 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1462
1463 PHONY += help
1464 help:
1465         @echo  'Cleaning targets:'
1466         @echo  '  clean           - Remove most generated files but keep the config and'
1467         @echo  '                    enough build support to build external modules'
1468         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1469         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1470         @echo  ''
1471         @echo  'Configuration targets:'
1472         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1473         @echo  ''
1474         @echo  'Other generic targets:'
1475         @echo  '  all             - Build all targets marked with [*]'
1476         @echo  '* vmlinux         - Build the bare kernel'
1477         @echo  '* modules         - Build all modules'
1478         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1479         @echo  '  dir/            - Build all files in dir and below'
1480         @echo  '  dir/file.[ois]  - Build specified target only'
1481         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1482         @echo  '                    (requires compiler support for LLVM assembly generation)'
1483         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1484         @echo  '                    (requires a recent binutils and recent build (System.map))'
1485         @echo  '  dir/file.ko     - Build module including final link'
1486         @echo  '  modules_prepare - Set up for building external modules'
1487         @echo  '  tags/TAGS       - Generate tags file for editors'
1488         @echo  '  cscope          - Generate cscope index'
1489         @echo  '  gtags           - Generate GNU GLOBAL index'
1490         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1491         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1492         @echo  '  image_name      - Output the image name (use with make -s)'
1493         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1494          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1495          echo  ''
1496         @echo  'Static analysers:'
1497         @echo  '  checkstack      - Generate a list of stack hogs'
1498         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1499         @echo  '  versioncheck    - Sanity check on version.h usage'
1500         @echo  '  includecheck    - Check for duplicate included header files'
1501         @echo  '  export_report   - List the usages of all exported symbols'
1502         @echo  '  headers_check   - Sanity check on exported headers'
1503         @echo  '  headerdep       - Detect inclusion cycles in headers'
1504         @echo  '  coccicheck      - Check with Coccinelle'
1505         @echo  ''
1506         @echo  'Kernel selftest:'
1507         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1508         @echo  '                    Build, install, and boot kernel before'
1509         @echo  '                    running kselftest on it'
1510         @echo  '  kselftest-clean - Remove all generated kselftest files'
1511         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1512         @echo  '                    .config.'
1513         @echo  ''
1514         @$(if $(dtstree), \
1515                 echo 'Devicetree:'; \
1516                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1517                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1518                 echo '')
1519
1520         @echo 'Userspace tools targets:'
1521         @echo '  use "make tools/help"'
1522         @echo '  or  "cd tools; make help"'
1523         @echo  ''
1524         @echo  'Kernel packaging:'
1525         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1526         @echo  ''
1527         @echo  'Documentation targets:'
1528         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1529         @echo  ''
1530         @echo  'Architecture specific targets ($(SRCARCH)):'
1531         @$(if $(archhelp),$(archhelp),\
1532                 echo '  No architecture specific help defined for $(SRCARCH)')
1533         @echo  ''
1534         @$(if $(boards), \
1535                 $(foreach b, $(boards), \
1536                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1537                 echo '')
1538         @$(if $(board-dirs), \
1539                 $(foreach b, $(board-dirs), \
1540                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1541                 printf "  %-16s - Show all of the above\\n" help-boards; \
1542                 echo '')
1543
1544         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1545         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1546         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1547         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1548         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1549         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1550         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1551         @echo  '                1: warnings which may be relevant and do not occur too often'
1552         @echo  '                2: warnings which occur quite often but may still be relevant'
1553         @echo  '                3: more obscure warnings, can most likely be ignored'
1554         @echo  '                Multiple levels can be combined with W=12 or W=123'
1555         @echo  ''
1556         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1557         @echo  'For further info see the ./README file'
1558
1559
1560 help-board-dirs := $(addprefix help-,$(board-dirs))
1561
1562 help-boards: $(help-board-dirs)
1563
1564 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1565
1566 $(help-board-dirs): help-%:
1567         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1568         @$(if $(boards-per-dir), \
1569                 $(foreach b, $(boards-per-dir), \
1570                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1571                 echo '')
1572
1573
1574 # Documentation targets
1575 # ---------------------------------------------------------------------------
1576 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1577                linkcheckdocs dochelp refcheckdocs
1578 PHONY += $(DOC_TARGETS)
1579 $(DOC_TARGETS):
1580         $(Q)$(MAKE) $(build)=Documentation $@
1581
1582 # Misc
1583 # ---------------------------------------------------------------------------
1584
1585 PHONY += scripts_gdb
1586 scripts_gdb: prepare0
1587         $(Q)$(MAKE) $(build)=scripts/gdb
1588         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1589
1590 ifdef CONFIG_GDB_SCRIPTS
1591 all: scripts_gdb
1592 endif
1593
1594 else # KBUILD_EXTMOD
1595
1596 ###
1597 # External module support.
1598 # When building external modules the kernel used as basis is considered
1599 # read-only, and no consistency checks are made and the make
1600 # system is not used on the basis kernel. If updates are required
1601 # in the basis kernel ordinary make commands (without M=...) must
1602 # be used.
1603 #
1604 # The following are the only valid targets when building external
1605 # modules.
1606 # make M=dir clean     Delete all automatically generated files
1607 # make M=dir modules   Make all modules in specified dir
1608 # make M=dir           Same as 'make M=dir modules'
1609 # make M=dir modules_install
1610 #                      Install the modules built in the module directory
1611 #                      Assumes install directory is already created
1612
1613 # We are always building modules
1614 KBUILD_MODULES := 1
1615
1616 PHONY += $(objtree)/Module.symvers
1617 $(objtree)/Module.symvers:
1618         @test -e $(objtree)/Module.symvers || ( \
1619         echo; \
1620         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1621         echo "           is missing; modules will have no dependencies and modversions."; \
1622         echo )
1623
1624 build-dirs := $(KBUILD_EXTMOD)
1625 PHONY += modules
1626 modules: descend $(objtree)/Module.symvers
1627         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1628
1629 PHONY += modules_install
1630 modules_install: _emodinst_ _emodinst_post
1631
1632 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1633 PHONY += _emodinst_
1634 _emodinst_:
1635         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1636         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1637
1638 PHONY += _emodinst_post
1639 _emodinst_post: _emodinst_
1640         $(call cmd,depmod)
1641
1642 clean-dirs := $(KBUILD_EXTMOD)
1643 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1644
1645 PHONY += /
1646 /:
1647         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1648
1649 PHONY += help
1650 help:
1651         @echo  '  Building external modules.'
1652         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1653         @echo  ''
1654         @echo  '  modules         - default target, build the module(s)'
1655         @echo  '  modules_install - install the module'
1656         @echo  '  clean           - remove generated files in module directory only'
1657         @echo  ''
1658
1659 PHONY += prepare
1660 endif # KBUILD_EXTMOD
1661
1662 # Handle descending into subdirectories listed in $(build-dirs)
1663 # Preset locale variables to speed up the build process. Limit locale
1664 # tweaks to this spot to avoid wrong language settings when running
1665 # make menuconfig etc.
1666 # Error messages still appears in the original language
1667 PHONY += descend $(build-dirs)
1668 descend: $(build-dirs)
1669 $(build-dirs): prepare
1670         $(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1
1671
1672 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1673 PHONY += $(clean-dirs) clean
1674 $(clean-dirs):
1675         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1676
1677 clean: $(clean-dirs)
1678         $(call cmd,rmdirs)
1679         $(call cmd,rmfiles)
1680         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1681                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1682                 -o -name '*.ko.*' \
1683                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1684                 -o -name '*.dwo' -o -name '*.lst' \
1685                 -o -name '*.su' -o -name '*.mod' \
1686                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1687                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1688                 -o -name '*.asn1.[ch]' \
1689                 -o -name '*.symtypes' -o -name 'modules.order' \
1690                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1691                 -o -name '*.c.[012]*.*' \
1692                 -o -name '*.ll' \
1693                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1694
1695 # Generate tags for editors
1696 # ---------------------------------------------------------------------------
1697 quiet_cmd_tags = GEN     $@
1698       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1699
1700 tags TAGS cscope gtags: FORCE
1701         $(call cmd,tags)
1702
1703 # Scripts to check various things for consistency
1704 # ---------------------------------------------------------------------------
1705
1706 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1707
1708 includecheck:
1709         find $(srctree)/* $(RCS_FIND_IGNORE) \
1710                 -name '*.[hcS]' -type f -print | sort \
1711                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1712
1713 versioncheck:
1714         find $(srctree)/* $(RCS_FIND_IGNORE) \
1715                 -name '*.[hcS]' -type f -print | sort \
1716                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1717
1718 coccicheck:
1719         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1720
1721 namespacecheck:
1722         $(PERL) $(srctree)/scripts/namespace.pl
1723
1724 export_report:
1725         $(PERL) $(srctree)/scripts/export_report.pl
1726
1727 PHONY += checkstack kernelrelease kernelversion image_name
1728
1729 # UML needs a little special treatment here.  It wants to use the host
1730 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1731 # else wants $(ARCH), including people doing cross-builds, which means
1732 # that $(SUBARCH) doesn't work here.
1733 ifeq ($(ARCH), um)
1734 CHECKSTACK_ARCH := $(SUBARCH)
1735 else
1736 CHECKSTACK_ARCH := $(ARCH)
1737 endif
1738 checkstack:
1739         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1740         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1741
1742 kernelrelease:
1743         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1744
1745 kernelversion:
1746         @echo $(KERNELVERSION)
1747
1748 image_name:
1749         @echo $(KBUILD_IMAGE)
1750
1751 # Clear a bunch of variables before executing the submake
1752
1753 ifeq ($(quiet),silent_)
1754 tools_silent=s
1755 endif
1756
1757 tools/: FORCE
1758         $(Q)mkdir -p $(objtree)/tools
1759         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1760
1761 tools/%: FORCE
1762         $(Q)mkdir -p $(objtree)/tools
1763         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1764
1765 # Single targets
1766 # ---------------------------------------------------------------------------
1767 # To build individual files in subdirectories, you can do like this:
1768 #
1769 #   make foo/bar/baz.s
1770 #
1771 # The supported suffixes for single-target are listed in 'single-targets'
1772 #
1773 # To build only under specific subdirectories, you can do like this:
1774 #
1775 #   make foo/bar/baz/
1776
1777 ifdef single-build
1778
1779 single-all := $(filter $(single-targets), $(MAKECMDGOALS))
1780
1781 # .ko is special because modpost is needed
1782 single-ko := $(sort $(filter %.ko, $(single-all)))
1783 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all)))
1784
1785 $(single-ko): single_modpost
1786         @:
1787 $(single-no-ko): descend
1788         @:
1789
1790 ifeq ($(KBUILD_EXTMOD),)
1791 # For the single build of in-tree modules, use a temporary file to avoid
1792 # the situation of modules_install installing an invalid modules.order.
1793 MODORDER := .modules.tmp
1794 endif
1795
1796 PHONY += single_modpost
1797 single_modpost: $(single-no-ko)
1798         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1799         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1800
1801 KBUILD_MODULES := 1
1802
1803 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1804
1805 single-build = $(if $(filter-out $@/, $(single-no-ko)),1)
1806
1807 endif
1808
1809 # FIXME Should go into a make.lib or something
1810 # ===========================================================================
1811
1812 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1813       cmd_rmdirs = rm -rf $(rm-dirs)
1814
1815 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1816       cmd_rmfiles = rm -f $(rm-files)
1817
1818 # Run depmod only if we have System.map and depmod is executable
1819 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1820       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1821                    $(KERNELRELEASE)
1822
1823 # read saved command lines for existing targets
1824 existing-targets := $(wildcard $(sort $(targets)))
1825
1826 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1827
1828 endif # config-targets
1829 endif # mixed-build
1830 endif # need-sub-make
1831
1832 PHONY += FORCE
1833 FORCE:
1834
1835 # Declare the contents of the PHONY variable as phony.  We keep that
1836 # information in a variable so we can use it in if_changed and friends.
1837 .PHONY: $(PHONY)