Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 6
   4 SUBLEVEL = 0
   5 EXTRAVERSION =
   6 NAME = Kleptomaniac Octopus
   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 $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
  72 #
  73 # To put more focus on warnings, be less verbose as default
  74 # Use 'make V=1' to see the full commands
  75
  76 ifeq ("$(origin V)", "command line")
  77   KBUILD_VERBOSE = $(V)
  78 endif
  79 ifndef KBUILD_VERBOSE
  80   KBUILD_VERBOSE = 0
  81 endif
  82
  83 ifeq ($(KBUILD_VERBOSE),1)
  84   quiet =
  85   Q =
  86 else
  87   quiet=quiet_
  88   Q = @
  89 endif
  90
  91 # If the user is running make -s (silent mode), suppress echoing of
  92 # commands
  93
  94 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  95   quiet=silent_
  96 endif
  97
  98 export quiet Q KBUILD_VERBOSE
  99
 100 # Kbuild will save output files in the current working directory.
 101 # This does not need to match to the root of the kernel source tree.
 102 #
 103 # For example, you can do this:
 104 #
 105 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 106 #
 107 # If you want to save output files in a different location, there are
 108 # two syntaxes to specify it.
 109 #
 110 # 1) O=
 111 # Use "make O=dir/to/store/output/files/"
 112 #
 113 # 2) Set KBUILD_OUTPUT
 114 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 115 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 116 #
 117 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 118 # variable.
 119
 120 # Do we want to change the working directory?
 121 ifeq ("$(origin O)", "command line")
 122   KBUILD_OUTPUT := $(O)
 123 endif
 124
 125 ifneq ($(KBUILD_OUTPUT),)
 126 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 127 # expand a shell special character '~'. We use a somewhat tedious way here.
 128 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 129 $(if $(abs_objtree),, \
 130      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 131
 132 # $(realpath ...) resolves symlinks
 133 abs_objtree := $(realpath $(abs_objtree))
 134 else
 135 abs_objtree := $(CURDIR)
 136 endif # ifneq ($(KBUILD_OUTPUT),)
 137
 138 ifeq ($(abs_objtree),$(CURDIR))
 139 # Suppress "Entering directory ..." unless we are changing the work directory.
 140 MAKEFLAGS += --no-print-directory
 141 else
 142 need-sub-make := 1
 143 endif
 144
 145 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 146
 147 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 148 $(error source directory cannot contain spaces or colons)
 149 endif
 150
 151 ifneq ($(abs_srctree),$(abs_objtree))
 152 # Look for make include files relative to root of kernel src
 153 #
 154 # This does not become effective immediately because MAKEFLAGS is re-parsed
 155 # once after the Makefile is read. We need to invoke sub-make.
 156 MAKEFLAGS += --include-dir=$(abs_srctree)
 157 need-sub-make := 1
 158 endif
 159
 160 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 161 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 162 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 163 need-sub-make := 1
 164 # Cancel implicit rules for this Makefile.
 165 $(lastword $(MAKEFILE_LIST)): ;
 166 endif
 167
 168 export abs_srctree abs_objtree
 169 export sub_make_done := 1
 170
 171 ifeq ($(need-sub-make),1)
 172
 173 PHONY += $(MAKECMDGOALS) sub-make
 174
 175 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 176         @:
 177
 178 # Invoke a second make in the output directory, passing relevant variables
 179 sub-make:
 180         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 181
 182 endif # need-sub-make
 183 endif # sub_make_done
 184
 185 # We process the rest of the Makefile if this is the final invocation of make
 186 ifeq ($(need-sub-make),)
 187
 188 # Do not print "Entering directory ...",
 189 # but we want to display it when entering to the output directory
 190 # so that IDEs/editors are able to understand relative filenames.
 191 MAKEFLAGS += --no-print-directory
 192
 193 # Call a source code checker (by default, "sparse") as part of the
 194 # C compilation.
 195 #
 196 # Use 'make C=1' to enable checking of only re-compiled files.
 197 # Use 'make C=2' to enable checking of *all* source files, regardless
 198 # of whether they are re-compiled or not.
 199 #
 200 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 201 # including where to get the "sparse" utility.
 202
 203 ifeq ("$(origin C)", "command line")
 204   KBUILD_CHECKSRC = $(C)
 205 endif
 206 ifndef KBUILD_CHECKSRC
 207   KBUILD_CHECKSRC = 0
 208 endif
 209
 210 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 211 # directory of external module to build. Setting M= takes precedence.
 212 ifeq ("$(origin M)", "command line")
 213   KBUILD_EXTMOD := $(M)
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD
 217
 218 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 219
 220 ifeq ($(abs_srctree),$(abs_objtree))
 221         # building in the source tree
 222         srctree := .
 223         building_out_of_srctree :=
 224 else
 225         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 226                 # building in a subdirectory of the source tree
 227                 srctree := ..
 228         else
 229                 srctree := $(abs_srctree)
 230         endif
 231         building_out_of_srctree := 1
 232 endif
 233
 234 ifneq ($(KBUILD_ABS_SRCTREE),)
 235 srctree := $(abs_srctree)
 236 endif
 237
 238 objtree         := .
 239 VPATH           := $(srctree)
 240
 241 export building_out_of_srctree srctree objtree VPATH
 242
 243 # To make sure we do not include .config for any of the *config targets
 244 # catch them early, and hand them over to scripts/kconfig/Makefile
 245 # It is allowed to specify more targets when calling make, including
 246 # mixing *config targets and build targets.
 247 # For example 'make oldconfig all'.
 248 # Detect when mixed targets is specified, and make a second invocation
 249 # of make so .config is not included in this case either (for *config).
 250
 251 version_h := include/generated/uapi/linux/version.h
 252 old_version_h := include/linux/version.h
 253
 254 clean-targets := %clean mrproper cleandocs
 255 no-dot-config-targets := $(clean-targets) \
 256                          cscope gtags TAGS tags help% %docs check% coccicheck \
 257                          $(version_h) headers headers_% archheaders archscripts \
 258                          %asm-generic kernelversion %src-pkg dt_binding_check \
 259                          outputmakefile
 260 no-sync-config-targets := $(no-dot-config-targets) install %install \
 261                            kernelrelease
 262 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 263
 264 config-build    :=
 265 mixed-build     :=
 266 need-config     := 1
 267 may-sync-config := 1
 268 single-build    :=
 269
 270 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 271         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 272                 need-config :=
 273         endif
 274 endif
 275
 276 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 277         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 278                 may-sync-config :=
 279         endif
 280 endif
 281
 282 ifneq ($(KBUILD_EXTMOD),)
 283         may-sync-config :=
 284 endif
 285
 286 ifeq ($(KBUILD_EXTMOD),)
 287         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 288                 config-build := 1
 289                 ifneq ($(words $(MAKECMDGOALS)),1)
 290                         mixed-build := 1
 291                 endif
 292         endif
 293 endif
 294
 295 # We cannot build single targets and the others at the same time
 296 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 297         single-build := 1
 298         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 299                 mixed-build := 1
 300         endif
 301 endif
 302
 303 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 304 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 305         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 306                 mixed-build := 1
 307         endif
 308 endif
 309
 310 # install and modules_install need also be processed one by one
 311 ifneq ($(filter install,$(MAKECMDGOALS)),)
 312         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 313                 mixed-build := 1
 314         endif
 315 endif
 316
 317 ifdef mixed-build
 318 # ===========================================================================
 319 # We're called with mixed targets (*config and build targets).
 320 # Handle them one by one.
 321
 322 PHONY += $(MAKECMDGOALS) __build_one_by_one
 323
 324 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 325         @:
 326
 327 __build_one_by_one:
 328         $(Q)set -e; \
 329         for i in $(MAKECMDGOALS); do \
 330                 $(MAKE) -f $(srctree)/Makefile $$i; \
 331         done
 332
 333 else # !mixed-build
 334
 335 include scripts/Kbuild.include
 336
 337 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 338 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 339 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 340 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 341
 342 include scripts/subarch.include
 343
 344 # Cross compiling and selecting different set of gcc/bin-utils
 345 # ---------------------------------------------------------------------------
 346 #
 347 # When performing cross compilation for other architectures ARCH shall be set
 348 # to the target architecture. (See arch/* for the possibilities).
 349 # ARCH can be set during invocation of make:
 350 # make ARCH=ia64
 351 # Another way is to have ARCH set in the environment.
 352 # The default ARCH is the host where make is executed.
 353
 354 # CROSS_COMPILE specify the prefix used for all executables used
 355 # during compilation. Only gcc and related bin-utils executables
 356 # are prefixed with $(CROSS_COMPILE).
 357 # CROSS_COMPILE can be set on the command line
 358 # make CROSS_COMPILE=ia64-linux-
 359 # Alternatively CROSS_COMPILE can be set in the environment.
 360 # Default value for CROSS_COMPILE is not to prefix executables
 361 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 362 ARCH            ?= $(SUBARCH)
 363
 364 # Architecture as present in compile.h
 365 UTS_MACHINE     := $(ARCH)
 366 SRCARCH         := $(ARCH)
 367
 368 # Additional ARCH settings for x86
 369 ifeq ($(ARCH),i386)
 370         SRCARCH := x86
 371 endif
 372 ifeq ($(ARCH),x86_64)
 373         SRCARCH := x86
 374 endif
 375
 376 # Additional ARCH settings for sparc
 377 ifeq ($(ARCH),sparc32)
 378        SRCARCH := sparc
 379 endif
 380 ifeq ($(ARCH),sparc64)
 381        SRCARCH := sparc
 382 endif
 383
 384 # Additional ARCH settings for sh
 385 ifeq ($(ARCH),sh64)
 386        SRCARCH := sh
 387 endif
 388
 389 KCONFIG_CONFIG  ?= .config
 390 export KCONFIG_CONFIG
 391
 392 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
 393 export KBUILD_DEFCONFIG := defconfig
 394
 395 # SHELL used by kbuild
 396 CONFIG_SHELL := sh
 397
 398 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 399 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 400 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 401
 402 HOSTCC       = gcc
 403 HOSTCXX      = g++
 404 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 405                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 406                 $(HOSTCFLAGS)
 407 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 408 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 409 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 410
 411 # Make variables (CC, etc...)
 412 LD              = $(CROSS_COMPILE)ld
 413 CC              = $(CROSS_COMPILE)gcc
 414 CPP             = $(CC) -E
 415 AR              = $(CROSS_COMPILE)ar
 416 NM              = $(CROSS_COMPILE)nm
 417 STRIP           = $(CROSS_COMPILE)strip
 418 OBJCOPY         = $(CROSS_COMPILE)objcopy
 419 OBJDUMP         = $(CROSS_COMPILE)objdump
 420 OBJSIZE         = $(CROSS_COMPILE)size
 421 READELF         = $(CROSS_COMPILE)readelf
 422 PAHOLE          = pahole
 423 LEX             = flex
 424 YACC            = bison
 425 AWK             = awk
 426 INSTALLKERNEL  := installkernel
 427 DEPMOD          = /sbin/depmod
 428 PERL            = perl
 429 PYTHON          = python
 430 PYTHON3         = python3
 431 CHECK           = sparse
 432 BASH            = bash
 433
 434 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 435                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 436 NOSTDINC_FLAGS :=
 437 CFLAGS_MODULE   =
 438 AFLAGS_MODULE   =
 439 LDFLAGS_MODULE  =
 440 CFLAGS_KERNEL   =
 441 AFLAGS_KERNEL   =
 442 LDFLAGS_vmlinux =
 443
 444 # Use USERINCLUDE when you must reference the UAPI directories only.
 445 USERINCLUDE    := \
 446                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 447                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 448                 -I$(srctree)/include/uapi \
 449                 -I$(objtree)/include/generated/uapi \
 450                 -include $(srctree)/include/linux/kconfig.h
 451
 452 # Use LINUXINCLUDE when you must reference the include/ directory.
 453 # Needed to be compatible with the O= option
 454 LINUXINCLUDE    := \
 455                 -I$(srctree)/arch/$(SRCARCH)/include \
 456                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 457                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 458                 -I$(objtree)/include \
 459                 $(USERINCLUDE)
 460
 461 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 462 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 463                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 464                    -Werror=implicit-function-declaration -Werror=implicit-int \
 465                    -Wno-format-security \
 466                    -std=gnu89
 467 KBUILD_CPPFLAGS := -D__KERNEL__
 468 KBUILD_AFLAGS_KERNEL :=
 469 KBUILD_CFLAGS_KERNEL :=
 470 KBUILD_AFLAGS_MODULE  := -DMODULE
 471 KBUILD_CFLAGS_MODULE  := -DMODULE
 472 KBUILD_LDFLAGS_MODULE :=
 473 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 474 KBUILD_LDFLAGS :=
 475 GCC_PLUGINS_CFLAGS :=
 476 CLANG_FLAGS :=
 477
 478 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 479 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
 480 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 481 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 482
 483 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 484 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 485 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 486 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 487 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 488 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 489
 490 # Files to ignore in find ... statements
 491
 492 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 493                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 494                           -prune -o
 495 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 496                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 497
 498 # ===========================================================================
 499 # Rules shared between *config targets and build targets
 500
 501 # Basic helpers built in scripts/basic/
 502 PHONY += scripts_basic
 503 scripts_basic:
 504         $(Q)$(MAKE) $(build)=scripts/basic
 505         $(Q)rm -f .tmp_quiet_recordmcount
 506
 507 PHONY += outputmakefile
 508 # Before starting out-of-tree build, make sure the source tree is clean.
 509 # outputmakefile generates a Makefile in the output directory, if using a
 510 # separate output directory. This allows convenient use of make in the
 511 # output directory.
 512 # At the same time when output Makefile generated, generate .gitignore to
 513 # ignore whole output directory
 514 outputmakefile:
 515 ifdef building_out_of_srctree
 516         $(Q)if [ -f $(srctree)/.config -o \
 517                  -d $(srctree)/include/config -o \
 518                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 519                 echo >&2 "***"; \
 520                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 521                 echo >&2 "*** in $(abs_srctree)";\
 522                 echo >&2 "***"; \
 523                 false; \
 524         fi
 525         $(Q)ln -fsn $(srctree) source
 526         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 527         $(Q)test -e .gitignore || \
 528         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 529 endif
 530
 531 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 532 ifneq ($(CROSS_COMPILE),)
 533 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 534 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 535 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 536 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 537 endif
 538 ifneq ($(GCC_TOOLCHAIN),)
 539 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 540 endif
 541 ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),)
 542 CLANG_FLAGS     += -no-integrated-as
 543 endif
 544 CLANG_FLAGS     += -Werror=unknown-warning-option
 545 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 546 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 547 export CLANG_FLAGS
 548 endif
 549
 550 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 551 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 552 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 553 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 554 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 555
 556 ifdef config-build
 557 # ===========================================================================
 558 # *config targets only - make sure prerequisites are updated, and descend
 559 # in scripts/kconfig to make the *config target
 560
 561 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 562 # KBUILD_DEFCONFIG may point out an alternative default configuration
 563 # used for 'make defconfig'
 564 include arch/$(SRCARCH)/Makefile
 565 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 566
 567 config: outputmakefile scripts_basic FORCE
 568         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 569
 570 %config: outputmakefile scripts_basic FORCE
 571         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 572
 573 else #!config-build
 574 # ===========================================================================
 575 # Build targets only - this includes vmlinux, arch specific targets, clean
 576 # targets and others. In general all targets except *config targets.
 577
 578 # If building an external module we do not care about the all: rule
 579 # but instead _all depend on modules
 580 PHONY += all
 581 ifeq ($(KBUILD_EXTMOD),)
 582 _all: all
 583 else
 584 _all: modules
 585 endif
 586
 587 # Decide whether to build built-in, modular, or both.
 588 # Normally, just do built-in.
 589
 590 KBUILD_MODULES :=
 591 KBUILD_BUILTIN := 1
 592
 593 # If we have only "make modules", don't compile built-in objects.
 594 # When we're building modules with modversions, we need to consider
 595 # the built-in objects during the descend as well, in order to
 596 # make sure the checksums are up to date before we record them.
 597
 598 ifeq ($(MAKECMDGOALS),modules)
 599   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 600 endif
 601
 602 # If we have "make <whatever> modules", compile modules
 603 # in addition to whatever we do anyway.
 604 # Just "make" or "make all" shall build modules as well
 605
 606 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 607   KBUILD_MODULES := 1
 608 endif
 609
 610 ifeq ($(MAKECMDGOALS),)
 611   KBUILD_MODULES := 1
 612 endif
 613
 614 export KBUILD_MODULES KBUILD_BUILTIN
 615
 616 ifdef need-config
 617 include include/config/auto.conf
 618 endif
 619
 620 ifeq ($(KBUILD_EXTMOD),)
 621 # Objects we will link into vmlinux / subdirs we need to visit
 622 init-y          := init/
 623 drivers-y       := drivers/ sound/
 624 drivers-$(CONFIG_SAMPLES) += samples/
 625 net-y           := net/
 626 libs-y          := lib/
 627 core-y          := usr/
 628 virt-y          := virt/
 629 endif # KBUILD_EXTMOD
 630
 631 # The all: target is the default when no target is given on the
 632 # command line.
 633 # This allow a user to issue only 'make' to build a kernel including modules
 634 # Defaults to vmlinux, but the arch makefile usually adds further targets
 635 all: vmlinux
 636
 637 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 638         $(call cc-option,-fno-tree-loop-im) \
 639         $(call cc-disable-warning,maybe-uninitialized,)
 640 export CFLAGS_GCOV
 641
 642 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 643 ifdef CONFIG_FUNCTION_TRACER
 644   CC_FLAGS_FTRACE := -pg
 645 endif
 646
 647 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 648 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 649 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 650 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 651 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 652 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 653 export RETPOLINE_CFLAGS
 654 export RETPOLINE_VDSO_CFLAGS
 655
 656 include arch/$(SRCARCH)/Makefile
 657
 658 ifdef need-config
 659 ifdef may-sync-config
 660 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 661 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 662 # because some architectures define CROSS_COMPILE there.
 663 include include/config/auto.conf.cmd
 664
 665 $(KCONFIG_CONFIG):
 666         @echo >&2 '***'
 667         @echo >&2 '*** Configuration file "$@" not found!'
 668         @echo >&2 '***'
 669         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 670         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 671         @echo >&2 '***'
 672         @/bin/false
 673
 674 # The actual configuration files used during the build are stored in
 675 # include/generated/ and include/config/. Update them if .config is newer than
 676 # include/config/auto.conf (which mirrors .config).
 677 #
 678 # This exploits the 'multi-target pattern rule' trick.
 679 # The syncconfig should be executed only once to make all the targets.
 680 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 681 %/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
 682         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 683 else # !may-sync-config
 684 # External modules and some install targets need include/generated/autoconf.h
 685 # and include/config/auto.conf but do not care if they are up-to-date.
 686 # Use auto.conf to trigger the test
 687 PHONY += include/config/auto.conf
 688
 689 include/config/auto.conf:
 690         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 691         echo >&2;                                                       \
 692         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 693         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 694         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 695         echo >&2 ;                                                      \
 696         /bin/false)
 697
 698 endif # may-sync-config
 699 endif # need-config
 700
 701 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 702 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 703 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 704 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 705 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 706
 707 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 708 KBUILD_CFLAGS += -O2
 709 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 710 KBUILD_CFLAGS += -O3
 711 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 712 KBUILD_CFLAGS += -Os
 713 endif
 714
 715 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 716 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 717 endif
 718
 719 # Tell gcc to never replace conditional load with a non-conditional one
 720 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 721 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 722
 723 include scripts/Makefile.kcov
 724 include scripts/Makefile.gcc-plugins
 725
 726 ifdef CONFIG_READABLE_ASM
 727 # Disable optimizations that make assembler listings hard to read.
 728 # reorder blocks reorders the control in the function
 729 # ipa clone creates specialized cloned functions
 730 # partial inlining inlines only parts of functions
 731 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 732                  $(call cc-option,-fno-ipa-cp-clone,) \
 733                  $(call cc-option,-fno-partial-inlining)
 734 endif
 735
 736 ifneq ($(CONFIG_FRAME_WARN),0)
 737 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 738 endif
 739
 740 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 741 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 742 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 743
 744 KBUILD_CFLAGS += $(stackp-flags-y)
 745
 746 ifdef CONFIG_CC_IS_CLANG
 747 KBUILD_CPPFLAGS += -Qunused-arguments
 748 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 749 KBUILD_CFLAGS += -Wno-gnu
 750 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 751 KBUILD_CFLAGS += -Wno-tautological-compare
 752 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 753 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 754 # See modpost pattern 2
 755 KBUILD_CFLAGS += -mno-global-merge
 756 else
 757
 758 # These warnings generated too much noise in a regular build.
 759 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 760 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 761
 762 # Warn about unmarked fall-throughs in switch statement.
 763 # Disabled for clang while comment to attribute conversion happens and
 764 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 765 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 766 endif
 767
 768 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 769 ifdef CONFIG_FRAME_POINTER
 770 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 771 else
 772 # Some targets (ARM with Thumb2, for example), can't be built with frame
 773 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 774 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 775 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 776 # -fomit-frame-pointer with FUNCTION_TRACER.
 777 ifndef CONFIG_FUNCTION_TRACER
 778 KBUILD_CFLAGS   += -fomit-frame-pointer
 779 endif
 780 endif
 781
 782 # Initialize all stack variables with a pattern, if desired.
 783 ifdef CONFIG_INIT_STACK_ALL
 784 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 785 endif
 786
 787 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 788
 789 ifdef CONFIG_DEBUG_INFO
 790 ifdef CONFIG_DEBUG_INFO_SPLIT
 791 DEBUG_CFLAGS    += -gsplit-dwarf
 792 else
 793 DEBUG_CFLAGS    += -g
 794 endif
 795 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 796 endif
 797 ifdef CONFIG_DEBUG_INFO_DWARF4
 798 DEBUG_CFLAGS    += -gdwarf-4
 799 endif
 800
 801 ifdef CONFIG_DEBUG_INFO_REDUCED
 802 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 803                    $(call cc-option,-fno-var-tracking)
 804 endif
 805
 806 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 807 export DEBUG_CFLAGS
 808
 809 ifdef CONFIG_FUNCTION_TRACER
 810 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 811   # gcc 5 supports generating the mcount tables directly
 812   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 813     CC_FLAGS_FTRACE     += -mrecord-mcount
 814     export CC_USING_RECORD_MCOUNT := 1
 815   endif
 816   ifdef CONFIG_HAVE_NOP_MCOUNT
 817     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 818       CC_FLAGS_FTRACE   += -mnop-mcount
 819       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 820     endif
 821   endif
 822 endif
 823 ifdef CONFIG_HAVE_FENTRY
 824   ifeq ($(call cc-option-yn, -mfentry),y)
 825     CC_FLAGS_FTRACE     += -mfentry
 826     CC_FLAGS_USING      += -DCC_USING_FENTRY
 827   endif
 828 endif
 829 export CC_FLAGS_FTRACE
 830 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 831 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 832 ifdef CONFIG_DYNAMIC_FTRACE
 833         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 834                 BUILD_C_RECORDMCOUNT := y
 835                 export BUILD_C_RECORDMCOUNT
 836         endif
 837 endif
 838 endif
 839
 840 # We trigger additional mismatches with less inlining
 841 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 842 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 843 endif
 844
 845 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 846 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 847 LDFLAGS_vmlinux += --gc-sections
 848 endif
 849
 850 ifdef CONFIG_LIVEPATCH
 851 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 852 endif
 853
 854 # arch Makefile may override CC so keep this after arch Makefile is included
 855 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 856
 857 # warn about C99 declaration after statement
 858 KBUILD_CFLAGS += -Wdeclaration-after-statement
 859
 860 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 861 KBUILD_CFLAGS += -Wvla
 862
 863 # disable pointer signed / unsigned warnings in gcc 4.0
 864 KBUILD_CFLAGS += -Wno-pointer-sign
 865
 866 # disable stringop warnings in gcc 8+
 867 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 868
 869 # disable invalid "can't wrap" optimizations for signed / pointers
 870 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 871
 872 # clang sets -fmerge-all-constants by default as optimization, but this
 873 # is non-conforming behavior for C and in fact breaks the kernel, so we
 874 # need to disable it here generally.
 875 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 876
 877 # for gcc -fno-merge-all-constants disables everything, but it is fine
 878 # to have actual conforming behavior enabled.
 879 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 880
 881 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 882 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 883
 884 # conserve stack if available
 885 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 886
 887 # Prohibit date/time macros, which would make the build non-deterministic
 888 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 889
 890 # enforce correct pointer usage
 891 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 892
 893 # Require designated initializers for all marked structures
 894 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 895
 896 # change __FILE__ to the relative path from the srctree
 897 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 898
 899 # ensure -fcf-protection is disabled when using retpoline as it is
 900 # incompatible with -mindirect-branch=thunk-extern
 901 ifdef CONFIG_RETPOLINE
 902 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 903 endif
 904
 905 include scripts/Makefile.kasan
 906 include scripts/Makefile.extrawarn
 907 include scripts/Makefile.ubsan
 908
 909 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 910 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 911 KBUILD_AFLAGS   += $(KAFLAGS)
 912 KBUILD_CFLAGS   += $(KCFLAGS)
 913
 914 KBUILD_LDFLAGS_MODULE += --build-id
 915 LDFLAGS_vmlinux += --build-id
 916
 917 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 918 LDFLAGS_vmlinux += $(call ld-option, -X,)
 919 endif
 920
 921 ifeq ($(CONFIG_RELR),y)
 922 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
 923 endif
 924
 925 # make the checker run with the right architecture
 926 CHECKFLAGS += --arch=$(ARCH)
 927
 928 # insure the checker run with the right endianness
 929 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 930
 931 # the checker needs the correct machine size
 932 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 933
 934 # Default kernel image to build when no specific target is given.
 935 # KBUILD_IMAGE may be overruled on the command line or
 936 # set in the environment
 937 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 938 # this default value
 939 export KBUILD_IMAGE ?= vmlinux
 940
 941 #
 942 # INSTALL_PATH specifies where to place the updated kernel and system map
 943 # images. Default is /boot, but you can set it to other values
 944 export  INSTALL_PATH ?= /boot
 945
 946 #
 947 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 948 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 949 # an argument if needed. Otherwise it defaults to the kernel install path
 950 #
 951 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 952
 953 #
 954 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 955 # relocations required by build roots.  This is not defined in the
 956 # makefile but the argument can be passed to make if needed.
 957 #
 958
 959 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 960 export MODLIB
 961
 962 #
 963 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 964 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 965 # the default option --strip-debug will be used.  Otherwise,
 966 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 967
 968 ifdef INSTALL_MOD_STRIP
 969 ifeq ($(INSTALL_MOD_STRIP),1)
 970 mod_strip_cmd = $(STRIP) --strip-debug
 971 else
 972 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 973 endif # INSTALL_MOD_STRIP=1
 974 else
 975 mod_strip_cmd = true
 976 endif # INSTALL_MOD_STRIP
 977 export mod_strip_cmd
 978
 979 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 980 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 981 # or CONFIG_MODULE_COMPRESS_XZ.
 982
 983 mod_compress_cmd = true
 984 ifdef CONFIG_MODULE_COMPRESS
 985   ifdef CONFIG_MODULE_COMPRESS_GZIP
 986     mod_compress_cmd = gzip -n -f
 987   endif # CONFIG_MODULE_COMPRESS_GZIP
 988   ifdef CONFIG_MODULE_COMPRESS_XZ
 989     mod_compress_cmd = xz -f
 990   endif # CONFIG_MODULE_COMPRESS_XZ
 991 endif # CONFIG_MODULE_COMPRESS
 992 export mod_compress_cmd
 993
 994 ifdef CONFIG_MODULE_SIG_ALL
 995 $(eval $(call config_filename,MODULE_SIG_KEY))
 996
 997 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 998 else
 999 mod_sign_cmd = true
1000 endif
1001 export mod_sign_cmd
1002
1003 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1004
1005 ifdef CONFIG_STACK_VALIDATION
1006   has_libelf := $(call try-run,\
1007                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1008   ifeq ($(has_libelf),1)
1009     objtool_target := tools/objtool FORCE
1010   else
1011     SKIP_STACK_VALIDATION := 1
1012     export SKIP_STACK_VALIDATION
1013   endif
1014 endif
1015
1016 PHONY += prepare0
1017
1018 export MODORDER := $(extmod-prefix)modules.order
1019 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1020
1021 ifeq ($(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/Makefile.package
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 quiet_cmd_autoksyms_h = GEN     $@
1072       cmd_autoksyms_h = mkdir -p $(dir $@); \
1073                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1074
1075 $(autoksyms_h):
1076         $(call cmd,autoksyms_h)
1077
1078 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1079
1080 # Final link of vmlinux with optional arch pass after final link
1081 cmd_link-vmlinux =                                                 \
1082         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1083         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1084
1085 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1086         +$(call if_changed,link-vmlinux)
1087
1088 targets := vmlinux
1089
1090 # The actual objects are generated when descending,
1091 # make sure no implicit rule kicks in
1092 $(sort $(vmlinux-deps)): descend ;
1093
1094 filechk_kernel.release = \
1095         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1096
1097 # Store (new) KERNELRELEASE string in include/config/kernel.release
1098 include/config/kernel.release: FORCE
1099         $(call filechk,kernel.release)
1100
1101 # Additional helpers built in scripts/
1102 # Carefully list dependencies so we do not try to build scripts twice
1103 # in parallel
1104 PHONY += scripts
1105 scripts: scripts_basic scripts_dtc
1106         $(Q)$(MAKE) $(build)=$(@)
1107
1108 # Things we need to do before we recursively start building the kernel
1109 # or the modules are listed in "prepare".
1110 # A multi level approach is used. prepareN is processed before prepareN-1.
1111 # archprepare is used in arch Makefiles and when processed asm symlink,
1112 # version.h and scripts_basic is processed / created.
1113
1114 PHONY += prepare archprepare
1115
1116 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1117         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1118
1119 prepare0: archprepare
1120         $(Q)$(MAKE) $(build)=scripts/mod
1121         $(Q)$(MAKE) $(build)=.
1122
1123 # All the preparing..
1124 prepare: prepare0 prepare-objtool
1125
1126 # Support for using generic headers in asm-generic
1127 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1128
1129 PHONY += asm-generic uapi-asm-generic
1130 asm-generic: uapi-asm-generic
1131         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1132         generic=include/asm-generic
1133 uapi-asm-generic:
1134         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1135         generic=include/uapi/asm-generic
1136
1137 PHONY += prepare-objtool
1138 prepare-objtool: $(objtool_target)
1139 ifeq ($(SKIP_STACK_VALIDATION),1)
1140 ifdef CONFIG_UNWINDER_ORC
1141         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1142         @false
1143 else
1144         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1145 endif
1146 endif
1147
1148 # Generate some files
1149 # ---------------------------------------------------------------------------
1150
1151 # KERNELRELEASE can change from a few different places, meaning version.h
1152 # needs to be updated, so this check is forced on all builds
1153
1154 uts_len := 64
1155 define filechk_utsrelease.h
1156         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1157           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1158           exit 1;                                                         \
1159         fi;                                                               \
1160         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1161 endef
1162
1163 define filechk_version.h
1164         echo \#define LINUX_VERSION_CODE $(shell                         \
1165         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1166         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1167 endef
1168
1169 $(version_h): FORCE
1170         $(call filechk,version.h)
1171         $(Q)rm -f $(old_version_h)
1172
1173 include/generated/utsrelease.h: include/config/kernel.release FORCE
1174         $(call filechk,utsrelease.h)
1175
1176 PHONY += headerdep
1177 headerdep:
1178         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1179         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1180
1181 # ---------------------------------------------------------------------------
1182 # Kernel headers
1183
1184 #Default location for installed headers
1185 export INSTALL_HDR_PATH = $(objtree)/usr
1186
1187 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1188       cmd_headers_install = \
1189         mkdir -p $(INSTALL_HDR_PATH); \
1190         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1191         usr/include $(INSTALL_HDR_PATH)
1192
1193 PHONY += headers_install
1194 headers_install: headers
1195         $(call cmd,headers_install)
1196
1197 PHONY += archheaders archscripts
1198
1199 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1200
1201 PHONY += headers
1202 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1203         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1204           $(error Headers not exportable for the $(SRCARCH) architecture))
1205         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1206         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1207
1208 # Deprecated. It is no-op now.
1209 PHONY += headers_check
1210 headers_check:
1211         @:
1212
1213 ifdef CONFIG_HEADERS_INSTALL
1214 prepare: headers
1215 endif
1216
1217 PHONY += scripts_unifdef
1218 scripts_unifdef: scripts_basic
1219         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1220
1221 # ---------------------------------------------------------------------------
1222 # Kernel selftest
1223
1224 PHONY += kselftest
1225 kselftest:
1226         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1227
1228 kselftest-%: FORCE
1229         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1230
1231 PHONY += kselftest-merge
1232 kselftest-merge:
1233         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1234         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1235                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1236         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1237
1238 # ---------------------------------------------------------------------------
1239 # Devicetree files
1240
1241 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1242 dtstree := arch/$(SRCARCH)/boot/dts
1243 endif
1244
1245 ifneq ($(dtstree),)
1246
1247 %.dtb: include/config/kernel.release scripts_dtc
1248         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1249
1250 PHONY += dtbs dtbs_install dtbs_check
1251 dtbs: include/config/kernel.release scripts_dtc
1252         $(Q)$(MAKE) $(build)=$(dtstree)
1253
1254 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1255 export CHECK_DTBS=y
1256 dtbs: dt_binding_check
1257 endif
1258
1259 dtbs_check: dtbs
1260
1261 dtbs_install:
1262         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1263
1264 ifdef CONFIG_OF_EARLY_FLATTREE
1265 all: dtbs
1266 endif
1267
1268 endif
1269
1270 PHONY += scripts_dtc
1271 scripts_dtc: scripts_basic
1272         $(Q)$(MAKE) $(build)=scripts/dtc
1273
1274 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1275 export CHECK_DT_BINDING=y
1276 endif
1277
1278 PHONY += dt_binding_check
1279 dt_binding_check: scripts_dtc
1280         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1281
1282 # ---------------------------------------------------------------------------
1283 # Modules
1284
1285 ifdef CONFIG_MODULES
1286
1287 # By default, build modules as well
1288
1289 all: modules
1290
1291 # Build modules
1292 #
1293 # A module can be listed more than once in obj-m resulting in
1294 # duplicate lines in modules.order files.  Those are removed
1295 # using awk while concatenating to the final file.
1296
1297 PHONY += modules
1298 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1299         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1300         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1301
1302 modules.order: descend
1303         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1304
1305 # Target to prepare building external modules
1306 PHONY += modules_prepare
1307 modules_prepare: prepare
1308
1309 # Target to install modules
1310 PHONY += modules_install
1311 modules_install: _modinst_ _modinst_post
1312
1313 PHONY += _modinst_
1314 _modinst_:
1315         @rm -rf $(MODLIB)/kernel
1316         @rm -f $(MODLIB)/source
1317         @mkdir -p $(MODLIB)/kernel
1318         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1319         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1320                 rm -f $(MODLIB)/build ; \
1321                 ln -s $(CURDIR) $(MODLIB)/build ; \
1322         fi
1323         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1324         @cp -f modules.builtin $(MODLIB)/
1325         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1326         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1327
1328 # This depmod is only for convenience to give the initial
1329 # boot a modules.dep even before / is mounted read-write.  However the
1330 # boot script depmod is the master version.
1331 PHONY += _modinst_post
1332 _modinst_post: _modinst_
1333         $(call cmd,depmod)
1334
1335 ifeq ($(CONFIG_MODULE_SIG), y)
1336 PHONY += modules_sign
1337 modules_sign:
1338         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1339 endif
1340
1341 else # CONFIG_MODULES
1342
1343 # Modules not configured
1344 # ---------------------------------------------------------------------------
1345
1346 PHONY += modules modules_install
1347 modules modules_install:
1348         @echo >&2
1349         @echo >&2 "The present kernel configuration has modules disabled."
1350         @echo >&2 "Type 'make config' and enable loadable module support."
1351         @echo >&2 "Then build a kernel with module support enabled."
1352         @echo >&2
1353         @exit 1
1354
1355 endif # CONFIG_MODULES
1356
1357 ###
1358 # Cleaning is done on three levels.
1359 # make clean     Delete most generated files
1360 #                Leave enough to build external modules
1361 # make mrproper  Delete the current configuration, and all generated files
1362 # make distclean Remove editor backup files, patch leftover files and the like
1363
1364 # Directories & files removed with 'make clean'
1365 CLEAN_DIRS  += include/ksym
1366 CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
1367
1368 # Directories & files removed with 'make mrproper'
1369 MRPROPER_DIRS  += include/config include/generated          \
1370                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1371                   debian/ snap/ tar-install/
1372 MRPROPER_FILES += .config .config.old .version \
1373                   Module.symvers \
1374                   signing_key.pem signing_key.priv signing_key.x509     \
1375                   x509.genkey extra_certificates signing_key.x509.keyid \
1376                   signing_key.x509.signer vmlinux-gdb.py \
1377                   *.spec
1378
1379 # Directories & files removed with 'make distclean'
1380 DISTCLEAN_DIRS  +=
1381 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1382
1383 # clean - Delete most, but leave enough to build external modules
1384 #
1385 clean: rm-dirs  := $(CLEAN_DIRS)
1386 clean: rm-files := $(CLEAN_FILES)
1387
1388 PHONY += archclean vmlinuxclean
1389
1390 vmlinuxclean:
1391         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1392         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1393
1394 clean: archclean vmlinuxclean
1395
1396 # mrproper - Delete all generated files, including .config
1397 #
1398 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1399 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1400 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1401
1402 PHONY += $(mrproper-dirs) mrproper
1403 $(mrproper-dirs):
1404         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1405
1406 mrproper: clean $(mrproper-dirs)
1407         $(call cmd,rmdirs)
1408         $(call cmd,rmfiles)
1409
1410 # distclean
1411 #
1412 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1413 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1414
1415 PHONY += distclean
1416
1417 distclean: mrproper
1418         $(call cmd,rmdirs)
1419         $(call cmd,rmfiles)
1420         @find $(srctree) $(RCS_FIND_IGNORE) \
1421                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1422                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1423                 -o -name 'core' \) \
1424                 -type f -print | xargs rm -f
1425
1426
1427 # Packaging of the kernel to various formats
1428 # ---------------------------------------------------------------------------
1429
1430 %src-pkg: FORCE
1431         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1432 %pkg: include/config/kernel.release FORCE
1433         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1434
1435 # Brief documentation of the typical targets used
1436 # ---------------------------------------------------------------------------
1437
1438 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1439 boards := $(sort $(notdir $(boards)))
1440 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1441 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1442
1443 PHONY += help
1444 help:
1445         @echo  'Cleaning targets:'
1446         @echo  '  clean           - Remove most generated files but keep the config and'
1447         @echo  '                    enough build support to build external modules'
1448         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1449         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1450         @echo  ''
1451         @echo  'Configuration targets:'
1452         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1453         @echo  ''
1454         @echo  'Other generic targets:'
1455         @echo  '  all             - Build all targets marked with [*]'
1456         @echo  '* vmlinux         - Build the bare kernel'
1457         @echo  '* modules         - Build all modules'
1458         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1459         @echo  '  dir/            - Build all files in dir and below'
1460         @echo  '  dir/file.[ois]  - Build specified target only'
1461         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1462         @echo  '                    (requires compiler support for LLVM assembly generation)'
1463         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1464         @echo  '                    (requires a recent binutils and recent build (System.map))'
1465         @echo  '  dir/file.ko     - Build module including final link'
1466         @echo  '  modules_prepare - Set up for building external modules'
1467         @echo  '  tags/TAGS       - Generate tags file for editors'
1468         @echo  '  cscope          - Generate cscope index'
1469         @echo  '  gtags           - Generate GNU GLOBAL index'
1470         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1471         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1472         @echo  '  image_name      - Output the image name (use with make -s)'
1473         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1474          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1475          echo  ''
1476         @echo  'Static analysers:'
1477         @echo  '  checkstack      - Generate a list of stack hogs'
1478         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1479         @echo  '  versioncheck    - Sanity check on version.h usage'
1480         @echo  '  includecheck    - Check for duplicate included header files'
1481         @echo  '  export_report   - List the usages of all exported symbols'
1482         @echo  '  headerdep       - Detect inclusion cycles in headers'
1483         @echo  '  coccicheck      - Check with Coccinelle'
1484         @echo  ''
1485         @echo  'Tools:'
1486         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1487         @echo  ''
1488         @echo  'Kernel selftest:'
1489         @echo  '  kselftest         - Build and run kernel selftest'
1490         @echo  '                      Build, install, and boot kernel before'
1491         @echo  '                      running kselftest on it'
1492         @echo  '                      Run as root for full coverage'
1493         @echo  '  kselftest-all     - Build kernel selftest'
1494         @echo  '  kselftest-install - Build and install kernel selftest'
1495         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1496         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1497         @echo  '                      kselftest to existing .config.'
1498         @echo  ''
1499         @$(if $(dtstree), \
1500                 echo 'Devicetree:'; \
1501                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1502                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1503                 echo '  dt_binding_check - Validate device tree binding documents'; \
1504                 echo '  dtbs_check       - Validate device tree source files';\
1505                 echo '')
1506
1507         @echo 'Userspace tools targets:'
1508         @echo '  use "make tools/help"'
1509         @echo '  or  "cd tools; make help"'
1510         @echo  ''
1511         @echo  'Kernel packaging:'
1512         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1513         @echo  ''
1514         @echo  'Documentation targets:'
1515         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1516         @echo  ''
1517         @echo  'Architecture specific targets ($(SRCARCH)):'
1518         @$(if $(archhelp),$(archhelp),\
1519                 echo '  No architecture specific help defined for $(SRCARCH)')
1520         @echo  ''
1521         @$(if $(boards), \
1522                 $(foreach b, $(boards), \
1523                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1524                 echo '')
1525         @$(if $(board-dirs), \
1526                 $(foreach b, $(board-dirs), \
1527                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1528                 printf "  %-16s - Show all of the above\\n" help-boards; \
1529                 echo '')
1530
1531         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1532         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1533         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1534         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1535         @echo  '                       (sparse by default)'
1536         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1537         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1538         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1539         @echo  '                1: warnings which may be relevant and do not occur too often'
1540         @echo  '                2: warnings which occur quite often but may still be relevant'
1541         @echo  '                3: more obscure warnings, can most likely be ignored'
1542         @echo  '                Multiple levels can be combined with W=12 or W=123'
1543         @echo  ''
1544         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1545         @echo  'For further info see the ./README file'
1546
1547
1548 help-board-dirs := $(addprefix help-,$(board-dirs))
1549
1550 help-boards: $(help-board-dirs)
1551
1552 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1553
1554 $(help-board-dirs): help-%:
1555         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1556         @$(if $(boards-per-dir), \
1557                 $(foreach b, $(boards-per-dir), \
1558                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1559                 echo '')
1560
1561
1562 # Documentation targets
1563 # ---------------------------------------------------------------------------
1564 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1565                linkcheckdocs dochelp refcheckdocs
1566 PHONY += $(DOC_TARGETS)
1567 $(DOC_TARGETS):
1568         $(Q)$(MAKE) $(build)=Documentation $@
1569
1570 # Misc
1571 # ---------------------------------------------------------------------------
1572
1573 PHONY += scripts_gdb
1574 scripts_gdb: prepare0
1575         $(Q)$(MAKE) $(build)=scripts/gdb
1576         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1577
1578 ifdef CONFIG_GDB_SCRIPTS
1579 all: scripts_gdb
1580 endif
1581
1582 else # KBUILD_EXTMOD
1583
1584 ###
1585 # External module support.
1586 # When building external modules the kernel used as basis is considered
1587 # read-only, and no consistency checks are made and the make
1588 # system is not used on the basis kernel. If updates are required
1589 # in the basis kernel ordinary make commands (without M=...) must
1590 # be used.
1591 #
1592 # The following are the only valid targets when building external
1593 # modules.
1594 # make M=dir clean     Delete all automatically generated files
1595 # make M=dir modules   Make all modules in specified dir
1596 # make M=dir           Same as 'make M=dir modules'
1597 # make M=dir modules_install
1598 #                      Install the modules built in the module directory
1599 #                      Assumes install directory is already created
1600
1601 # We are always building modules
1602 KBUILD_MODULES := 1
1603
1604 PHONY += $(objtree)/Module.symvers
1605 $(objtree)/Module.symvers:
1606         @test -e $(objtree)/Module.symvers || ( \
1607         echo; \
1608         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1609         echo "           is missing; modules will have no dependencies and modversions."; \
1610         echo )
1611
1612 build-dirs := $(KBUILD_EXTMOD)
1613 PHONY += modules
1614 modules: descend $(objtree)/Module.symvers
1615         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1616
1617 PHONY += modules_install
1618 modules_install: _emodinst_ _emodinst_post
1619
1620 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1621 PHONY += _emodinst_
1622 _emodinst_:
1623         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1624         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1625
1626 PHONY += _emodinst_post
1627 _emodinst_post: _emodinst_
1628         $(call cmd,depmod)
1629
1630 clean-dirs := $(KBUILD_EXTMOD)
1631 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1632
1633 PHONY += /
1634 /:
1635         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1636
1637 PHONY += help
1638 help:
1639         @echo  '  Building external modules.'
1640         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1641         @echo  ''
1642         @echo  '  modules         - default target, build the module(s)'
1643         @echo  '  modules_install - install the module'
1644         @echo  '  clean           - remove generated files in module directory only'
1645         @echo  ''
1646
1647 PHONY += prepare
1648 endif # KBUILD_EXTMOD
1649
1650 # Single targets
1651 # ---------------------------------------------------------------------------
1652 # To build individual files in subdirectories, you can do like this:
1653 #
1654 #   make foo/bar/baz.s
1655 #
1656 # The supported suffixes for single-target are listed in 'single-targets'
1657 #
1658 # To build only under specific subdirectories, you can do like this:
1659 #
1660 #   make foo/bar/baz/
1661
1662 ifdef single-build
1663
1664 # .ko is special because modpost is needed
1665 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1666 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1667
1668 $(single-ko): single_modpost
1669         @:
1670 $(single-no-ko): descend
1671         @:
1672
1673 ifeq ($(KBUILD_EXTMOD),)
1674 # For the single build of in-tree modules, use a temporary file to avoid
1675 # the situation of modules_install installing an invalid modules.order.
1676 MODORDER := .modules.tmp
1677 endif
1678
1679 PHONY += single_modpost
1680 single_modpost: $(single-no-ko)
1681         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1682         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1683
1684 KBUILD_MODULES := 1
1685
1686 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1687
1688 # trim unrelated directories
1689 build-dirs := $(foreach d, $(build-dirs), \
1690                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1691
1692 endif
1693
1694 # Handle descending into subdirectories listed in $(build-dirs)
1695 # Preset locale variables to speed up the build process. Limit locale
1696 # tweaks to this spot to avoid wrong language settings when running
1697 # make menuconfig etc.
1698 # Error messages still appears in the original language
1699 PHONY += descend $(build-dirs)
1700 descend: $(build-dirs)
1701 $(build-dirs): prepare
1702         $(Q)$(MAKE) $(build)=$@ \
1703         single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1704         need-builtin=1 need-modorder=1
1705
1706 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1707 PHONY += $(clean-dirs) clean
1708 $(clean-dirs):
1709         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1710
1711 clean: $(clean-dirs)
1712         $(call cmd,rmdirs)
1713         $(call cmd,rmfiles)
1714         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1715                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1716                 -o -name '*.ko.*' \
1717                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1718                 -o -name '*.dwo' -o -name '*.lst' \
1719                 -o -name '*.su' -o -name '*.mod' \
1720                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1721                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1722                 -o -name '*.asn1.[ch]' \
1723                 -o -name '*.symtypes' -o -name 'modules.order' \
1724                 -o -name '.tmp_*.o.*' \
1725                 -o -name '*.c.[012]*.*' \
1726                 -o -name '*.ll' \
1727                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1728
1729 # Generate tags for editors
1730 # ---------------------------------------------------------------------------
1731 quiet_cmd_tags = GEN     $@
1732       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1733
1734 tags TAGS cscope gtags: FORCE
1735         $(call cmd,tags)
1736
1737 # Script to generate missing namespace dependencies
1738 # ---------------------------------------------------------------------------
1739
1740 PHONY += nsdeps
1741 nsdeps: export KBUILD_NSDEPS=1
1742 nsdeps: modules
1743         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1744
1745 # Scripts to check various things for consistency
1746 # ---------------------------------------------------------------------------
1747
1748 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1749
1750 includecheck:
1751         find $(srctree)/* $(RCS_FIND_IGNORE) \
1752                 -name '*.[hcS]' -type f -print | sort \
1753                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1754
1755 versioncheck:
1756         find $(srctree)/* $(RCS_FIND_IGNORE) \
1757                 -name '*.[hcS]' -type f -print | sort \
1758                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1759
1760 coccicheck:
1761         $(Q)$(BASH) $(srctree)/scripts/$@
1762
1763 namespacecheck:
1764         $(PERL) $(srctree)/scripts/namespace.pl
1765
1766 export_report:
1767         $(PERL) $(srctree)/scripts/export_report.pl
1768
1769 PHONY += checkstack kernelrelease kernelversion image_name
1770
1771 # UML needs a little special treatment here.  It wants to use the host
1772 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1773 # else wants $(ARCH), including people doing cross-builds, which means
1774 # that $(SUBARCH) doesn't work here.
1775 ifeq ($(ARCH), um)
1776 CHECKSTACK_ARCH := $(SUBARCH)
1777 else
1778 CHECKSTACK_ARCH := $(ARCH)
1779 endif
1780 checkstack:
1781         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1782         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1783
1784 kernelrelease:
1785         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1786
1787 kernelversion:
1788         @echo $(KERNELVERSION)
1789
1790 image_name:
1791         @echo $(KBUILD_IMAGE)
1792
1793 # Clear a bunch of variables before executing the submake
1794
1795 ifeq ($(quiet),silent_)
1796 tools_silent=s
1797 endif
1798
1799 tools/: FORCE
1800         $(Q)mkdir -p $(objtree)/tools
1801         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1802
1803 tools/%: FORCE
1804         $(Q)mkdir -p $(objtree)/tools
1805         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1806
1807 # FIXME Should go into a make.lib or something
1808 # ===========================================================================
1809
1810 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1811       cmd_rmdirs = rm -rf $(rm-dirs)
1812
1813 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1814       cmd_rmfiles = rm -f $(rm-files)
1815
1816 # Run depmod only if we have System.map and depmod is executable
1817 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1818       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1819                    $(KERNELRELEASE)
1820
1821 # read saved command lines for existing targets
1822 existing-targets := $(wildcard $(sort $(targets)))
1823
1824 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1825
1826 endif # config-build
1827 endif # mixed-build
1828 endif # need-sub-make
1829
1830 PHONY += FORCE
1831 FORCE:
1832
1833 # Declare the contents of the PHONY variable as phony.  We keep that
1834 # information in a variable so we can use it in if_changed and friends.
1835 .PHONY: $(PHONY)