Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 4
   4 SUBLEVEL = 168
   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 $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(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 = $(C)
 204 endif
 205 ifndef KBUILD_CHECKSRC
 206   KBUILD_CHECKSRC = 0
 207 endif
 208
 209 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 210 # directory of external module to build. Setting M= takes precedence.
 211 ifeq ("$(origin M)", "command line")
 212   KBUILD_EXTMOD := $(M)
 213 endif
 214
 215 export KBUILD_CHECKSRC KBUILD_EXTMOD
 216
 217 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 218
 219 ifeq ($(abs_srctree),$(abs_objtree))
 220         # building in the source tree
 221         srctree := .
 222         building_out_of_srctree :=
 223 else
 224         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 225                 # building in a subdirectory of the source tree
 226                 srctree := ..
 227         else
 228                 srctree := $(abs_srctree)
 229         endif
 230         building_out_of_srctree := 1
 231 endif
 232
 233 ifneq ($(KBUILD_ABS_SRCTREE),)
 234 srctree := $(abs_srctree)
 235 endif
 236
 237 objtree         := .
 238 VPATH           := $(srctree)
 239
 240 export building_out_of_srctree srctree objtree VPATH
 241
 242 # To make sure we do not include .config for any of the *config targets
 243 # catch them early, and hand them over to scripts/kconfig/Makefile
 244 # It is allowed to specify more targets when calling make, including
 245 # mixing *config targets and build targets.
 246 # For example 'make oldconfig all'.
 247 # Detect when mixed targets is specified, and make a second invocation
 248 # of make so .config is not included in this case either (for *config).
 249
 250 version_h := include/generated/uapi/linux/version.h
 251 old_version_h := include/linux/version.h
 252
 253 clean-targets := %clean mrproper cleandocs
 254 no-dot-config-targets := $(clean-targets) \
 255                          cscope gtags TAGS tags help% %docs check% coccicheck \
 256                          $(version_h) headers headers_% archheaders archscripts \
 257                          %asm-generic kernelversion %src-pkg
 258 no-sync-config-targets := $(no-dot-config-targets) install %install \
 259                            kernelrelease
 260 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 261
 262 config-build    :=
 263 mixed-build     :=
 264 need-config     := 1
 265 may-sync-config := 1
 266 single-build    :=
 267
 268 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 269         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 270                 need-config :=
 271         endif
 272 endif
 273
 274 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 275         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 276                 may-sync-config :=
 277         endif
 278 endif
 279
 280 ifneq ($(KBUILD_EXTMOD),)
 281         may-sync-config :=
 282 endif
 283
 284 ifeq ($(KBUILD_EXTMOD),)
 285         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 286                 config-build := 1
 287                 ifneq ($(words $(MAKECMDGOALS)),1)
 288                         mixed-build := 1
 289                 endif
 290         endif
 291 endif
 292
 293 # We cannot build single targets and the others at the same time
 294 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 295         single-build := 1
 296         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 297                 mixed-build := 1
 298         endif
 299 endif
 300
 301 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 302 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 303         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 304                 mixed-build := 1
 305         endif
 306 endif
 307
 308 # install and modules_install need also be processed one by one
 309 ifneq ($(filter install,$(MAKECMDGOALS)),)
 310         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 311                 mixed-build := 1
 312         endif
 313 endif
 314
 315 ifdef mixed-build
 316 # ===========================================================================
 317 # We're called with mixed targets (*config and build targets).
 318 # Handle them one by one.
 319
 320 PHONY += $(MAKECMDGOALS) __build_one_by_one
 321
 322 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 323         @:
 324
 325 __build_one_by_one:
 326         $(Q)set -e; \
 327         for i in $(MAKECMDGOALS); do \
 328                 $(MAKE) -f $(srctree)/Makefile $$i; \
 329         done
 330
 331 else # !mixed-build
 332
 333 include scripts/Kbuild.include
 334
 335 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 336 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 337 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 338 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 339
 340 include scripts/subarch.include
 341
 342 # Cross compiling and selecting different set of gcc/bin-utils
 343 # ---------------------------------------------------------------------------
 344 #
 345 # When performing cross compilation for other architectures ARCH shall be set
 346 # to the target architecture. (See arch/* for the possibilities).
 347 # ARCH can be set during invocation of make:
 348 # make ARCH=ia64
 349 # Another way is to have ARCH set in the environment.
 350 # The default ARCH is the host where make is executed.
 351
 352 # CROSS_COMPILE specify the prefix used for all executables used
 353 # during compilation. Only gcc and related bin-utils executables
 354 # are prefixed with $(CROSS_COMPILE).
 355 # CROSS_COMPILE can be set on the command line
 356 # make CROSS_COMPILE=ia64-linux-
 357 # Alternatively CROSS_COMPILE can be set in the environment.
 358 # Default value for CROSS_COMPILE is not to prefix executables
 359 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 360 ARCH            ?= $(SUBARCH)
 361
 362 # Architecture as present in compile.h
 363 UTS_MACHINE     := $(ARCH)
 364 SRCARCH         := $(ARCH)
 365
 366 # Additional ARCH settings for x86
 367 ifeq ($(ARCH),i386)
 368         SRCARCH := x86
 369 endif
 370 ifeq ($(ARCH),x86_64)
 371         SRCARCH := x86
 372 endif
 373
 374 # Additional ARCH settings for sparc
 375 ifeq ($(ARCH),sparc32)
 376        SRCARCH := sparc
 377 endif
 378 ifeq ($(ARCH),sparc64)
 379        SRCARCH := sparc
 380 endif
 381
 382 # Additional ARCH settings for sh
 383 ifeq ($(ARCH),sh64)
 384        SRCARCH := sh
 385 endif
 386
 387 KCONFIG_CONFIG  ?= .config
 388 export KCONFIG_CONFIG
 389
 390 # SHELL used by kbuild
 391 CONFIG_SHELL := sh
 392
 393 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 394 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 395 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 396
 397 ifneq ($(LLVM),)
 398 HOSTCC  = clang
 399 HOSTCXX = clang++
 400 else
 401 HOSTCC  = gcc
 402 HOSTCXX = g++
 403 endif
 404 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 405                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 406                 $(HOSTCFLAGS)
 407 KBUILD_HOSTCXXFLAGS := -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 CPP             = $(CC) -E
 413 ifneq ($(LLVM),)
 414 CC              = clang
 415 LD              = ld.lld
 416 AR              = llvm-ar
 417 NM              = llvm-nm
 418 OBJCOPY         = llvm-objcopy
 419 OBJDUMP         = llvm-objdump
 420 READELF         = llvm-readelf
 421 OBJSIZE         = llvm-size
 422 STRIP           = llvm-strip
 423 else
 424 CC              = $(CROSS_COMPILE)gcc
 425 LD              = $(CROSS_COMPILE)ld
 426 AR              = $(CROSS_COMPILE)ar
 427 NM              = $(CROSS_COMPILE)nm
 428 OBJCOPY         = $(CROSS_COMPILE)objcopy
 429 OBJDUMP         = $(CROSS_COMPILE)objdump
 430 READELF         = $(CROSS_COMPILE)readelf
 431 OBJSIZE         = $(CROSS_COMPILE)size
 432 STRIP           = $(CROSS_COMPILE)strip
 433 endif
 434 PAHOLE          = pahole
 435 LEX             = flex
 436 YACC            = bison
 437 AWK             = awk
 438 INSTALLKERNEL  := installkernel
 439 DEPMOD          = depmod
 440 PERL            = perl
 441 PYTHON          = python
 442 PYTHON3         = python3
 443 CHECK           = sparse
 444 BASH            = bash
 445 KGZIP           = gzip
 446 KBZIP2          = bzip2
 447 KLZOP           = lzop
 448 LZMA            = lzma
 449 LZ4             = lz4c
 450 XZ              = xz
 451
 452 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 453                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 454 NOSTDINC_FLAGS :=
 455 CFLAGS_MODULE   =
 456 AFLAGS_MODULE   =
 457 LDFLAGS_MODULE  =
 458 CFLAGS_KERNEL   =
 459 AFLAGS_KERNEL   =
 460 LDFLAGS_vmlinux =
 461
 462 # Use USERINCLUDE when you must reference the UAPI directories only.
 463 USERINCLUDE    := \
 464                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 465                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 466                 -I$(srctree)/include/uapi \
 467                 -I$(objtree)/include/generated/uapi \
 468                 -include $(srctree)/include/linux/kconfig.h
 469
 470 # Use LINUXINCLUDE when you must reference the include/ directory.
 471 # Needed to be compatible with the O= option
 472 LINUXINCLUDE    := \
 473                 -I$(srctree)/arch/$(SRCARCH)/include \
 474                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 475                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 476                 -I$(objtree)/include \
 477                 $(USERINCLUDE)
 478
 479 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 480 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 481                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 482                    -Werror=implicit-function-declaration -Werror=implicit-int \
 483                    -Werror=return-type -Wno-format-security \
 484                    -std=gnu89
 485 KBUILD_CPPFLAGS := -D__KERNEL__
 486 KBUILD_AFLAGS_KERNEL :=
 487 KBUILD_CFLAGS_KERNEL :=
 488 KBUILD_AFLAGS_MODULE  := -DMODULE
 489 KBUILD_CFLAGS_MODULE  := -DMODULE
 490 KBUILD_LDFLAGS_MODULE :=
 491 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 492 KBUILD_LDFLAGS :=
 493 GCC_PLUGINS_CFLAGS :=
 494 CLANG_FLAGS :=
 495
 496 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 497 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
 498 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 499 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ
 500 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 501
 502 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 503 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 504 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 505 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 506 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 507 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 508
 509 # Files to ignore in find ... statements
 510
 511 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 512                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 513                           -prune -o
 514 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 515                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 516
 517 # ===========================================================================
 518 # Rules shared between *config targets and build targets
 519
 520 # Basic helpers built in scripts/basic/
 521 PHONY += scripts_basic
 522 scripts_basic:
 523         $(Q)$(MAKE) $(build)=scripts/basic
 524         $(Q)rm -f .tmp_quiet_recordmcount
 525
 526 PHONY += outputmakefile
 527 # Before starting out-of-tree build, make sure the source tree is clean.
 528 # outputmakefile generates a Makefile in the output directory, if using a
 529 # separate output directory. This allows convenient use of make in the
 530 # output directory.
 531 # At the same time when output Makefile generated, generate .gitignore to
 532 # ignore whole output directory
 533 outputmakefile:
 534 ifdef building_out_of_srctree
 535         $(Q)if [ -f $(srctree)/.config -o \
 536                  -d $(srctree)/include/config -o \
 537                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 538                 echo >&2 "***"; \
 539                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 540                 echo >&2 "*** in $(abs_srctree)";\
 541                 echo >&2 "***"; \
 542                 false; \
 543         fi
 544         $(Q)ln -fsn $(srctree) source
 545         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 546         $(Q)test -e .gitignore || \
 547         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 548 endif
 549
 550 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 551 ifneq ($(CROSS_COMPILE),)
 552 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 553 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 554 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 555 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 556 endif
 557 ifneq ($(GCC_TOOLCHAIN),)
 558 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 559 endif
 560 ifneq ($(LLVM_IAS),1)
 561 CLANG_FLAGS     += -no-integrated-as
 562 endif
 563 CLANG_FLAGS     += -Werror=unknown-warning-option
 564 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 565 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 566 export CLANG_FLAGS
 567 endif
 568
 569 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 570 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 571 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 572 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 573 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 574
 575 ifdef config-build
 576 # ===========================================================================
 577 # *config targets only - make sure prerequisites are updated, and descend
 578 # in scripts/kconfig to make the *config target
 579
 580 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 581 # KBUILD_DEFCONFIG may point out an alternative default configuration
 582 # used for 'make defconfig'
 583 include arch/$(SRCARCH)/Makefile
 584 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 585
 586 config: outputmakefile scripts_basic FORCE
 587         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 588
 589 %config: outputmakefile scripts_basic FORCE
 590         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 591
 592 else #!config-build
 593 # ===========================================================================
 594 # Build targets only - this includes vmlinux, arch specific targets, clean
 595 # targets and others. In general all targets except *config targets.
 596
 597 # If building an external module we do not care about the all: rule
 598 # but instead _all depend on modules
 599 PHONY += all
 600 ifeq ($(KBUILD_EXTMOD),)
 601 _all: all
 602 else
 603 _all: modules
 604 endif
 605
 606 # Decide whether to build built-in, modular, or both.
 607 # Normally, just do built-in.
 608
 609 KBUILD_MODULES :=
 610 KBUILD_BUILTIN := 1
 611
 612 # If we have only "make modules", don't compile built-in objects.
 613 ifeq ($(MAKECMDGOALS),modules)
 614   KBUILD_BUILTIN :=
 615 endif
 616
 617 # If we have "make <whatever> modules", compile modules
 618 # in addition to whatever we do anyway.
 619 # Just "make" or "make all" shall build modules as well
 620
 621 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 622   KBUILD_MODULES := 1
 623 endif
 624
 625 ifeq ($(MAKECMDGOALS),)
 626   KBUILD_MODULES := 1
 627 endif
 628
 629 export KBUILD_MODULES KBUILD_BUILTIN
 630
 631 ifdef need-config
 632 include include/config/auto.conf
 633 endif
 634
 635 ifeq ($(KBUILD_EXTMOD),)
 636 # Objects we will link into vmlinux / subdirs we need to visit
 637 init-y          := init/
 638 drivers-y       := drivers/ sound/
 639 drivers-$(CONFIG_SAMPLES) += samples/
 640 net-y           := net/
 641 libs-y          := lib/
 642 core-y          := usr/
 643 virt-y          := virt/
 644 endif # KBUILD_EXTMOD
 645
 646 # The all: target is the default when no target is given on the
 647 # command line.
 648 # This allow a user to issue only 'make' to build a kernel including modules
 649 # Defaults to vmlinux, but the arch makefile usually adds further targets
 650 all: vmlinux
 651
 652 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 653         $(call cc-option,-fno-tree-loop-im) \
 654         $(call cc-disable-warning,maybe-uninitialized,)
 655 export CFLAGS_GCOV
 656
 657 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 658 ifdef CONFIG_FUNCTION_TRACER
 659   CC_FLAGS_FTRACE := -pg
 660 endif
 661
 662 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 663 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 664 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 665 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 666 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 667 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 668 export RETPOLINE_CFLAGS
 669 export RETPOLINE_VDSO_CFLAGS
 670
 671 include arch/$(SRCARCH)/Makefile
 672
 673 ifdef need-config
 674 ifdef may-sync-config
 675 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 676 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 677 # because some architectures define CROSS_COMPILE there.
 678 include include/config/auto.conf.cmd
 679
 680 $(KCONFIG_CONFIG):
 681         @echo >&2 '***'
 682         @echo >&2 '*** Configuration file "$@" not found!'
 683         @echo >&2 '***'
 684         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 685         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 686         @echo >&2 '***'
 687         @/bin/false
 688
 689 # The actual configuration files used during the build are stored in
 690 # include/generated/ and include/config/. Update them if .config is newer than
 691 # include/config/auto.conf (which mirrors .config).
 692 #
 693 # This exploits the 'multi-target pattern rule' trick.
 694 # The syncconfig should be executed only once to make all the targets.
 695 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 696         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 697 else # !may-sync-config
 698 # External modules and some install targets need include/generated/autoconf.h
 699 # and include/config/auto.conf but do not care if they are up-to-date.
 700 # Use auto.conf to trigger the test
 701 PHONY += include/config/auto.conf
 702
 703 include/config/auto.conf:
 704         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 705         echo >&2;                                                       \
 706         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 707         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 708         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 709         echo >&2 ;                                                      \
 710         /bin/false)
 711
 712 endif # may-sync-config
 713 endif # need-config
 714
 715 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 716 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 717 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 718 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 719 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 720
 721 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 722 KBUILD_CFLAGS += -O2
 723 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 724 KBUILD_CFLAGS += -O3
 725 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 726 KBUILD_CFLAGS += -Os
 727 endif
 728
 729 # Tell gcc to never replace conditional load with a non-conditional one
 730 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 731 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 732
 733 include scripts/Makefile.kcov
 734 include scripts/Makefile.gcc-plugins
 735
 736 ifdef CONFIG_READABLE_ASM
 737 # Disable optimizations that make assembler listings hard to read.
 738 # reorder blocks reorders the control in the function
 739 # ipa clone creates specialized cloned functions
 740 # partial inlining inlines only parts of functions
 741 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 742                  $(call cc-option,-fno-ipa-cp-clone,) \
 743                  $(call cc-option,-fno-partial-inlining)
 744 endif
 745
 746 ifneq ($(CONFIG_FRAME_WARN),0)
 747 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 748 endif
 749
 750 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 751 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 752 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 753
 754 KBUILD_CFLAGS += $(stackp-flags-y)
 755
 756 ifdef CONFIG_CC_IS_CLANG
 757 KBUILD_CPPFLAGS += -Qunused-arguments
 758 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 759 KBUILD_CFLAGS += -Wno-gnu
 760 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 761 KBUILD_CFLAGS += -Wno-tautological-compare
 762 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 763 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 764 # See modpost pattern 2
 765 KBUILD_CFLAGS += -mno-global-merge
 766 else
 767
 768 # Warn about unmarked fall-throughs in switch statement.
 769 # Disabled for clang while comment to attribute conversion happens and
 770 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 771 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 772 endif
 773
 774 # These warnings generated too much noise in a regular build.
 775 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 776 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 777
 778 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 779 ifdef CONFIG_FRAME_POINTER
 780 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 781 else
 782 # Some targets (ARM with Thumb2, for example), can't be built with frame
 783 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 784 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 785 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 786 # -fomit-frame-pointer with FUNCTION_TRACER.
 787 ifndef CONFIG_FUNCTION_TRACER
 788 KBUILD_CFLAGS   += -fomit-frame-pointer
 789 endif
 790 endif
 791
 792 # Initialize all stack variables with a pattern, if desired.
 793 ifdef CONFIG_INIT_STACK_ALL
 794 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 795 endif
 796
 797 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 798
 799 ifdef CONFIG_DEBUG_INFO
 800 ifdef CONFIG_DEBUG_INFO_SPLIT
 801 DEBUG_CFLAGS    += -gsplit-dwarf
 802 else
 803 DEBUG_CFLAGS    += -g
 804 endif
 805 ifneq ($(LLVM_IAS),1)
 806 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 807 endif
 808 endif
 809
 810 ifdef CONFIG_DEBUG_INFO_DWARF4
 811 DEBUG_CFLAGS    += -gdwarf-4
 812 endif
 813
 814 ifdef CONFIG_DEBUG_INFO_REDUCED
 815 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 816                    $(call cc-option,-fno-var-tracking)
 817 endif
 818
 819 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 820 export DEBUG_CFLAGS
 821
 822 ifdef CONFIG_FUNCTION_TRACER
 823 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 824   # gcc 5 supports generating the mcount tables directly
 825   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 826     CC_FLAGS_FTRACE     += -mrecord-mcount
 827     export CC_USING_RECORD_MCOUNT := 1
 828   endif
 829   ifdef CONFIG_HAVE_NOP_MCOUNT
 830     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 831       CC_FLAGS_FTRACE   += -mnop-mcount
 832       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 833     endif
 834   endif
 835 endif
 836 ifdef CONFIG_HAVE_FENTRY
 837   ifeq ($(call cc-option-yn, -mfentry),y)
 838     CC_FLAGS_FTRACE     += -mfentry
 839     CC_FLAGS_USING      += -DCC_USING_FENTRY
 840   endif
 841 endif
 842 export CC_FLAGS_FTRACE
 843 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 844 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 845 ifdef CONFIG_DYNAMIC_FTRACE
 846         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 847                 BUILD_C_RECORDMCOUNT := y
 848                 export BUILD_C_RECORDMCOUNT
 849         endif
 850 endif
 851 endif
 852
 853 # We trigger additional mismatches with less inlining
 854 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 855 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 856 endif
 857
 858 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 859 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 860 LDFLAGS_vmlinux += --gc-sections
 861 endif
 862
 863 ifdef CONFIG_LIVEPATCH
 864 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 865 endif
 866
 867 # arch Makefile may override CC so keep this after arch Makefile is included
 868 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 869
 870 # warn about C99 declaration after statement
 871 KBUILD_CFLAGS += -Wdeclaration-after-statement
 872
 873 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 874 KBUILD_CFLAGS += -Wvla
 875
 876 # disable pointer signed / unsigned warnings in gcc 4.0
 877 KBUILD_CFLAGS += -Wno-pointer-sign
 878
 879 # disable stringop warnings in gcc 8+
 880 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 881
 882 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 883 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 884 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 885 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 886
 887 # Another good warning that we'll want to enable eventually
 888 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 889
 890 # Enabled with W=2, disabled by default as noisy
 891 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 892
 893 # disable invalid "can't wrap" optimizations for signed / pointers
 894 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 895
 896 # clang sets -fmerge-all-constants by default as optimization, but this
 897 # is non-conforming behavior for C and in fact breaks the kernel, so we
 898 # need to disable it here generally.
 899 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 900
 901 # for gcc -fno-merge-all-constants disables everything, but it is fine
 902 # to have actual conforming behavior enabled.
 903 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 904
 905 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 906 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 907
 908 # conserve stack if available
 909 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 910
 911 # Prohibit date/time macros, which would make the build non-deterministic
 912 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 913
 914 # enforce correct pointer usage
 915 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 916
 917 # Require designated initializers for all marked structures
 918 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 919
 920 # change __FILE__ to the relative path from the srctree
 921 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 922
 923 include scripts/Makefile.kasan
 924 include scripts/Makefile.extrawarn
 925 include scripts/Makefile.ubsan
 926
 927 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 928 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 929 KBUILD_AFLAGS   += $(KAFLAGS)
 930 KBUILD_CFLAGS   += $(KCFLAGS)
 931
 932 KBUILD_LDFLAGS_MODULE += --build-id
 933 LDFLAGS_vmlinux += --build-id
 934
 935 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 936 LDFLAGS_vmlinux += $(call ld-option, -X,)
 937 endif
 938
 939 ifeq ($(CONFIG_RELR),y)
 940 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
 941 endif
 942
 943 # make the checker run with the right architecture
 944 CHECKFLAGS += --arch=$(ARCH)
 945
 946 # insure the checker run with the right endianness
 947 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 948
 949 # the checker needs the correct machine size
 950 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 951
 952 # Default kernel image to build when no specific target is given.
 953 # KBUILD_IMAGE may be overruled on the command line or
 954 # set in the environment
 955 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 956 # this default value
 957 export KBUILD_IMAGE ?= vmlinux
 958
 959 #
 960 # INSTALL_PATH specifies where to place the updated kernel and system map
 961 # images. Default is /boot, but you can set it to other values
 962 export  INSTALL_PATH ?= /boot
 963
 964 #
 965 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 966 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 967 # an argument if needed. Otherwise it defaults to the kernel install path
 968 #
 969 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 970
 971 #
 972 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 973 # relocations required by build roots.  This is not defined in the
 974 # makefile but the argument can be passed to make if needed.
 975 #
 976
 977 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 978 export MODLIB
 979
 980 #
 981 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 982 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 983 # the default option --strip-debug will be used.  Otherwise,
 984 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 985
 986 ifdef INSTALL_MOD_STRIP
 987 ifeq ($(INSTALL_MOD_STRIP),1)
 988 mod_strip_cmd = $(STRIP) --strip-debug
 989 else
 990 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 991 endif # INSTALL_MOD_STRIP=1
 992 else
 993 mod_strip_cmd = true
 994 endif # INSTALL_MOD_STRIP
 995 export mod_strip_cmd
 996
 997 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 998 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 999 # or CONFIG_MODULE_COMPRESS_XZ.
1000
1001 mod_compress_cmd = true
1002 ifdef CONFIG_MODULE_COMPRESS
1003   ifdef CONFIG_MODULE_COMPRESS_GZIP
1004     mod_compress_cmd = $(KGZIP) -n -f
1005   endif # CONFIG_MODULE_COMPRESS_GZIP
1006   ifdef CONFIG_MODULE_COMPRESS_XZ
1007     mod_compress_cmd = $(XZ) -f
1008   endif # CONFIG_MODULE_COMPRESS_XZ
1009 endif # CONFIG_MODULE_COMPRESS
1010 export mod_compress_cmd
1011
1012 ifdef CONFIG_MODULE_SIG_ALL
1013 $(eval $(call config_filename,MODULE_SIG_KEY))
1014
1015 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1016 else
1017 mod_sign_cmd = true
1018 endif
1019 export mod_sign_cmd
1020
1021 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1022
1023 ifdef CONFIG_STACK_VALIDATION
1024   has_libelf := $(call try-run,\
1025                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1026   ifeq ($(has_libelf),1)
1027     objtool_target := tools/objtool FORCE
1028   else
1029     SKIP_STACK_VALIDATION := 1
1030     export SKIP_STACK_VALIDATION
1031   endif
1032 endif
1033
1034 PHONY += prepare0
1035
1036 export MODORDER := $(extmod-prefix)modules.order
1037
1038 ifeq ($(KBUILD_EXTMOD),)
1039 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1040
1041 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1042                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1043                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1044
1045 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1046                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1047                         $(drivers-) $(net-) $(libs-) $(virt-))))
1048
1049 build-dirs      := $(vmlinux-dirs)
1050 clean-dirs      := $(vmlinux-alldirs)
1051
1052 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1053 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1054 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1055 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1056 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1057 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1058 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1059
1060 # Externally visible symbols (used by link-vmlinux.sh)
1061 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1062                               $(drivers-y) $(net-y) $(virt-y)
1063 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1064 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1065 export LDFLAGS_vmlinux
1066 # used by scripts/Makefile.package
1067 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1068
1069 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1070
1071 # Recurse until adjust_autoksyms.sh is satisfied
1072 PHONY += autoksyms_recursive
1073 ifdef CONFIG_TRIM_UNUSED_KSYMS
1074 autoksyms_recursive: descend modules.order
1075         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1076           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1077 endif
1078
1079 # For the kernel to actually contain only the needed exported symbols,
1080 # we have to build modules as well to determine what those symbols are.
1081 # (this can be evaluated only once include/config/auto.conf has been included)
1082 ifdef CONFIG_TRIM_UNUSED_KSYMS
1083   KBUILD_MODULES := 1
1084 endif
1085
1086 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1087
1088 $(autoksyms_h):
1089         $(Q)mkdir -p $(dir $@)
1090         $(Q)touch $@
1091
1092 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1093
1094 # Final link of vmlinux with optional arch pass after final link
1095 cmd_link-vmlinux =                                                 \
1096         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1097         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1098
1099 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1100         +$(call if_changed,link-vmlinux)
1101
1102 targets := vmlinux
1103
1104 # The actual objects are generated when descending,
1105 # make sure no implicit rule kicks in
1106 $(sort $(vmlinux-deps)): descend ;
1107
1108 filechk_kernel.release = \
1109         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1110
1111 # Store (new) KERNELRELEASE string in include/config/kernel.release
1112 include/config/kernel.release: FORCE
1113         $(call filechk,kernel.release)
1114
1115 # Additional helpers built in scripts/
1116 # Carefully list dependencies so we do not try to build scripts twice
1117 # in parallel
1118 PHONY += scripts
1119 scripts: scripts_basic scripts_dtc
1120         $(Q)$(MAKE) $(build)=$(@)
1121
1122 # Things we need to do before we recursively start building the kernel
1123 # or the modules are listed in "prepare".
1124 # A multi level approach is used. prepareN is processed before prepareN-1.
1125 # archprepare is used in arch Makefiles and when processed asm symlink,
1126 # version.h and scripts_basic is processed / created.
1127
1128 PHONY += prepare archprepare
1129
1130 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1131         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1132
1133 prepare0: archprepare
1134         $(Q)$(MAKE) $(build)=scripts/mod
1135         $(Q)$(MAKE) $(build)=.
1136
1137 # All the preparing..
1138 prepare: prepare0 prepare-objtool
1139
1140 # Support for using generic headers in asm-generic
1141 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1142
1143 PHONY += asm-generic uapi-asm-generic
1144 asm-generic: uapi-asm-generic
1145         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1146         generic=include/asm-generic
1147 uapi-asm-generic:
1148         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1149         generic=include/uapi/asm-generic
1150
1151 PHONY += prepare-objtool
1152 prepare-objtool: $(objtool_target)
1153 ifeq ($(SKIP_STACK_VALIDATION),1)
1154 ifdef CONFIG_UNWINDER_ORC
1155         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1156         @false
1157 else
1158         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1159 endif
1160 endif
1161
1162 # Generate some files
1163 # ---------------------------------------------------------------------------
1164
1165 # KERNELRELEASE can change from a few different places, meaning version.h
1166 # needs to be updated, so this check is forced on all builds
1167
1168 uts_len := 64
1169 define filechk_utsrelease.h
1170         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1171           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1172           exit 1;                                                         \
1173         fi;                                                               \
1174         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1175 endef
1176
1177 define filechk_version.h
1178         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1179                 echo \#define LINUX_VERSION_CODE $(shell                 \
1180                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1181         else                                                             \
1182                 echo \#define LINUX_VERSION_CODE $(shell                 \
1183                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1184         fi;                                                              \
1185         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1186         ((c) > 255 ? 255 : (c)))'
1187 endef
1188
1189 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1190 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1191 $(version_h): FORCE
1192         $(call filechk,version.h)
1193         $(Q)rm -f $(old_version_h)
1194
1195 include/generated/utsrelease.h: include/config/kernel.release FORCE
1196         $(call filechk,utsrelease.h)
1197
1198 PHONY += headerdep
1199 headerdep:
1200         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1201         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1202
1203 # ---------------------------------------------------------------------------
1204 # Kernel headers
1205
1206 #Default location for installed headers
1207 export INSTALL_HDR_PATH = $(objtree)/usr
1208
1209 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1210       cmd_headers_install = \
1211         mkdir -p $(INSTALL_HDR_PATH); \
1212         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1213         usr/include $(INSTALL_HDR_PATH)
1214
1215 PHONY += headers_install
1216 headers_install: headers
1217         $(call cmd,headers_install)
1218
1219 PHONY += archheaders archscripts
1220
1221 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1222
1223 PHONY += headers
1224 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1225         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1226           $(error Headers not exportable for the $(SRCARCH) architecture))
1227         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1228         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1229
1230 # Deprecated. It is no-op now.
1231 PHONY += headers_check
1232 headers_check:
1233         @:
1234
1235 ifdef CONFIG_HEADERS_INSTALL
1236 prepare: headers
1237 endif
1238
1239 PHONY += scripts_unifdef
1240 scripts_unifdef: scripts_basic
1241         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1242
1243 # ---------------------------------------------------------------------------
1244 # Kernel selftest
1245
1246 PHONY += kselftest
1247 kselftest:
1248         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1249
1250 kselftest-%: FORCE
1251         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1252
1253 PHONY += kselftest-merge
1254 kselftest-merge:
1255         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1256         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1257                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1258         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1259
1260 # ---------------------------------------------------------------------------
1261 # Devicetree files
1262
1263 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1264 dtstree := arch/$(SRCARCH)/boot/dts
1265 endif
1266
1267 ifneq ($(dtstree),)
1268
1269 %.dtb: include/config/kernel.release scripts_dtc
1270         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1271
1272 PHONY += dtbs dtbs_install dtbs_check
1273 dtbs: include/config/kernel.release scripts_dtc
1274         $(Q)$(MAKE) $(build)=$(dtstree)
1275
1276 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1277 dtbs: dt_binding_check
1278 endif
1279
1280 dtbs_check: export CHECK_DTBS=1
1281 dtbs_check: dtbs
1282
1283 dtbs_install:
1284         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1285
1286 ifdef CONFIG_OF_EARLY_FLATTREE
1287 all: dtbs
1288 endif
1289
1290 endif
1291
1292 PHONY += scripts_dtc
1293 scripts_dtc: scripts_basic
1294         $(Q)$(MAKE) $(build)=scripts/dtc
1295
1296 PHONY += dt_binding_check
1297 dt_binding_check: scripts_dtc
1298         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1299
1300 # ---------------------------------------------------------------------------
1301 # Modules
1302
1303 ifdef CONFIG_MODULES
1304
1305 # By default, build modules as well
1306
1307 all: modules
1308
1309 # When we're building modules with modversions, we need to consider
1310 # the built-in objects during the descend as well, in order to
1311 # make sure the checksums are up to date before we record them.
1312 ifdef CONFIG_MODVERSIONS
1313   KBUILD_BUILTIN := 1
1314 endif
1315
1316 # Build modules
1317 #
1318 # A module can be listed more than once in obj-m resulting in
1319 # duplicate lines in modules.order files.  Those are removed
1320 # using awk while concatenating to the final file.
1321
1322 PHONY += modules
1323 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1324         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1325         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1326
1327 modules.order: descend
1328         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1329
1330 modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1331
1332 modules.builtin: $(modbuiltin-dirs)
1333         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1334
1335 PHONY += $(modbuiltin-dirs)
1336 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1337 # here to make it self-healing in case somebody accidentally removes it.
1338 $(modbuiltin-dirs): include/config/tristate.conf
1339         $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1340
1341 # Target to prepare building external modules
1342 PHONY += modules_prepare
1343 modules_prepare: prepare
1344
1345 # Target to install modules
1346 PHONY += modules_install
1347 modules_install: _modinst_ _modinst_post
1348
1349 PHONY += _modinst_
1350 _modinst_:
1351         @rm -rf $(MODLIB)/kernel
1352         @rm -f $(MODLIB)/source
1353         @mkdir -p $(MODLIB)/kernel
1354         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1355         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1356                 rm -f $(MODLIB)/build ; \
1357                 ln -s $(CURDIR) $(MODLIB)/build ; \
1358         fi
1359         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1360         @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1361         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1362         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1363
1364 # This depmod is only for convenience to give the initial
1365 # boot a modules.dep even before / is mounted read-write.  However the
1366 # boot script depmod is the master version.
1367 PHONY += _modinst_post
1368 _modinst_post: _modinst_
1369         $(call cmd,depmod)
1370
1371 ifeq ($(CONFIG_MODULE_SIG), y)
1372 PHONY += modules_sign
1373 modules_sign:
1374         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1375 endif
1376
1377 else # CONFIG_MODULES
1378
1379 # Modules not configured
1380 # ---------------------------------------------------------------------------
1381
1382 PHONY += modules modules_install
1383 modules modules_install:
1384         @echo >&2
1385         @echo >&2 "The present kernel configuration has modules disabled."
1386         @echo >&2 "Type 'make config' and enable loadable module support."
1387         @echo >&2 "Then build a kernel with module support enabled."
1388         @echo >&2
1389         @exit 1
1390
1391 endif # CONFIG_MODULES
1392
1393 ###
1394 # Cleaning is done on three levels.
1395 # make clean     Delete most generated files
1396 #                Leave enough to build external modules
1397 # make mrproper  Delete the current configuration, and all generated files
1398 # make distclean Remove editor backup files, patch leftover files and the like
1399
1400 # Directories & files removed with 'make clean'
1401 CLEAN_DIRS  += include/ksym
1402 CLEAN_FILES += modules.builtin.modinfo
1403
1404 # Directories & files removed with 'make mrproper'
1405 MRPROPER_DIRS  += include/config include/generated          \
1406                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1407                   debian/ snap/ tar-install/
1408 MRPROPER_FILES += .config .config.old .version \
1409                   Module.symvers \
1410                   signing_key.pem signing_key.priv signing_key.x509     \
1411                   x509.genkey extra_certificates signing_key.x509.keyid \
1412                   signing_key.x509.signer vmlinux-gdb.py \
1413                   *.spec
1414
1415 # Directories & files removed with 'make distclean'
1416 DISTCLEAN_DIRS  +=
1417 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1418
1419 # clean - Delete most, but leave enough to build external modules
1420 #
1421 clean: rm-dirs  := $(CLEAN_DIRS)
1422 clean: rm-files := $(CLEAN_FILES)
1423
1424 PHONY += archclean vmlinuxclean
1425
1426 vmlinuxclean:
1427         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1428         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1429
1430 clean: archclean vmlinuxclean
1431
1432 # mrproper - Delete all generated files, including .config
1433 #
1434 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1435 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1436 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1437
1438 PHONY += $(mrproper-dirs) mrproper
1439 $(mrproper-dirs):
1440         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1441
1442 mrproper: clean $(mrproper-dirs)
1443         $(call cmd,rmdirs)
1444         $(call cmd,rmfiles)
1445
1446 # distclean
1447 #
1448 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1449 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1450
1451 PHONY += distclean
1452
1453 distclean: mrproper
1454         $(call cmd,rmdirs)
1455         $(call cmd,rmfiles)
1456         @find $(srctree) $(RCS_FIND_IGNORE) \
1457                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1458                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1459                 -o -name 'core' \) \
1460                 -type f -print | xargs rm -f
1461
1462
1463 # Packaging of the kernel to various formats
1464 # ---------------------------------------------------------------------------
1465
1466 %src-pkg: FORCE
1467         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1468 %pkg: include/config/kernel.release FORCE
1469         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1470
1471 # Brief documentation of the typical targets used
1472 # ---------------------------------------------------------------------------
1473
1474 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1475 boards := $(sort $(notdir $(boards)))
1476 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1477 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1478
1479 PHONY += help
1480 help:
1481         @echo  'Cleaning targets:'
1482         @echo  '  clean           - Remove most generated files but keep the config and'
1483         @echo  '                    enough build support to build external modules'
1484         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1485         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1486         @echo  ''
1487         @echo  'Configuration targets:'
1488         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1489         @echo  ''
1490         @echo  'Other generic targets:'
1491         @echo  '  all             - Build all targets marked with [*]'
1492         @echo  '* vmlinux         - Build the bare kernel'
1493         @echo  '* modules         - Build all modules'
1494         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1495         @echo  '  dir/            - Build all files in dir and below'
1496         @echo  '  dir/file.[ois]  - Build specified target only'
1497         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1498         @echo  '                    (requires compiler support for LLVM assembly generation)'
1499         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1500         @echo  '                    (requires a recent binutils and recent build (System.map))'
1501         @echo  '  dir/file.ko     - Build module including final link'
1502         @echo  '  modules_prepare - Set up for building external modules'
1503         @echo  '  tags/TAGS       - Generate tags file for editors'
1504         @echo  '  cscope          - Generate cscope index'
1505         @echo  '  gtags           - Generate GNU GLOBAL index'
1506         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1507         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1508         @echo  '  image_name      - Output the image name (use with make -s)'
1509         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1510          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1511          echo  ''
1512         @echo  'Static analysers:'
1513         @echo  '  checkstack      - Generate a list of stack hogs'
1514         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1515         @echo  '  versioncheck    - Sanity check on version.h usage'
1516         @echo  '  includecheck    - Check for duplicate included header files'
1517         @echo  '  export_report   - List the usages of all exported symbols'
1518         @echo  '  headerdep       - Detect inclusion cycles in headers'
1519         @echo  '  coccicheck      - Check with Coccinelle'
1520         @echo  ''
1521         @echo  'Tools:'
1522         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1523         @echo  ''
1524         @echo  'Kernel selftest:'
1525         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1526         @echo  '                    Build, install, and boot kernel before'
1527         @echo  '                    running kselftest on it'
1528         @echo  '  kselftest-clean - Remove all generated kselftest files'
1529         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1530         @echo  '                    .config.'
1531         @echo  ''
1532         @$(if $(dtstree), \
1533                 echo 'Devicetree:'; \
1534                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1535                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1536                 echo '  dt_binding_check - Validate device tree binding documents'; \
1537                 echo '  dtbs_check       - Validate device tree source files';\
1538                 echo '')
1539
1540         @echo 'Userspace tools targets:'
1541         @echo '  use "make tools/help"'
1542         @echo '  or  "cd tools; make help"'
1543         @echo  ''
1544         @echo  'Kernel packaging:'
1545         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1546         @echo  ''
1547         @echo  'Documentation targets:'
1548         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1549         @echo  ''
1550         @echo  'Architecture specific targets ($(SRCARCH)):'
1551         @$(if $(archhelp),$(archhelp),\
1552                 echo '  No architecture specific help defined for $(SRCARCH)')
1553         @echo  ''
1554         @$(if $(boards), \
1555                 $(foreach b, $(boards), \
1556                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1557                 echo '')
1558         @$(if $(board-dirs), \
1559                 $(foreach b, $(board-dirs), \
1560                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1561                 printf "  %-16s - Show all of the above\\n" help-boards; \
1562                 echo '')
1563
1564         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1565         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1566         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1567         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1568         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1569         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1570         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1571         @echo  '                1: warnings which may be relevant and do not occur too often'
1572         @echo  '                2: warnings which occur quite often but may still be relevant'
1573         @echo  '                3: more obscure warnings, can most likely be ignored'
1574         @echo  '                Multiple levels can be combined with W=12 or W=123'
1575         @echo  ''
1576         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1577         @echo  'For further info see the ./README file'
1578
1579
1580 help-board-dirs := $(addprefix help-,$(board-dirs))
1581
1582 help-boards: $(help-board-dirs)
1583
1584 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1585
1586 $(help-board-dirs): help-%:
1587         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1588         @$(if $(boards-per-dir), \
1589                 $(foreach b, $(boards-per-dir), \
1590                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1591                 echo '')
1592
1593
1594 # Documentation targets
1595 # ---------------------------------------------------------------------------
1596 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1597                linkcheckdocs dochelp refcheckdocs
1598 PHONY += $(DOC_TARGETS)
1599 $(DOC_TARGETS):
1600         $(Q)$(MAKE) $(build)=Documentation $@
1601
1602 # Misc
1603 # ---------------------------------------------------------------------------
1604
1605 PHONY += scripts_gdb
1606 scripts_gdb: prepare0
1607         $(Q)$(MAKE) $(build)=scripts/gdb
1608         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1609
1610 ifdef CONFIG_GDB_SCRIPTS
1611 all: scripts_gdb
1612 endif
1613
1614 else # KBUILD_EXTMOD
1615
1616 ###
1617 # External module support.
1618 # When building external modules the kernel used as basis is considered
1619 # read-only, and no consistency checks are made and the make
1620 # system is not used on the basis kernel. If updates are required
1621 # in the basis kernel ordinary make commands (without M=...) must
1622 # be used.
1623 #
1624 # The following are the only valid targets when building external
1625 # modules.
1626 # make M=dir clean     Delete all automatically generated files
1627 # make M=dir modules   Make all modules in specified dir
1628 # make M=dir           Same as 'make M=dir modules'
1629 # make M=dir modules_install
1630 #                      Install the modules built in the module directory
1631 #                      Assumes install directory is already created
1632
1633 # We are always building modules
1634 KBUILD_MODULES := 1
1635
1636 PHONY += $(objtree)/Module.symvers
1637 $(objtree)/Module.symvers:
1638         @test -e $(objtree)/Module.symvers || ( \
1639         echo; \
1640         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1641         echo "           is missing; modules will have no dependencies and modversions."; \
1642         echo )
1643
1644 build-dirs := $(KBUILD_EXTMOD)
1645 PHONY += modules
1646 modules: descend $(objtree)/Module.symvers
1647         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1648
1649 PHONY += modules_install
1650 modules_install: _emodinst_ _emodinst_post
1651
1652 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1653 PHONY += _emodinst_
1654 _emodinst_:
1655         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1656         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1657
1658 PHONY += _emodinst_post
1659 _emodinst_post: _emodinst_
1660         $(call cmd,depmod)
1661
1662 clean-dirs := $(KBUILD_EXTMOD)
1663 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1664
1665 PHONY += /
1666 /:
1667         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1668
1669 PHONY += help
1670 help:
1671         @echo  '  Building external modules.'
1672         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1673         @echo  ''
1674         @echo  '  modules         - default target, build the module(s)'
1675         @echo  '  modules_install - install the module'
1676         @echo  '  clean           - remove generated files in module directory only'
1677         @echo  ''
1678
1679 PHONY += prepare
1680 endif # KBUILD_EXTMOD
1681
1682 # Single targets
1683 # ---------------------------------------------------------------------------
1684 # To build individual files in subdirectories, you can do like this:
1685 #
1686 #   make foo/bar/baz.s
1687 #
1688 # The supported suffixes for single-target are listed in 'single-targets'
1689 #
1690 # To build only under specific subdirectories, you can do like this:
1691 #
1692 #   make foo/bar/baz/
1693
1694 ifdef single-build
1695
1696 # .ko is special because modpost is needed
1697 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1698 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1699
1700 $(single-ko): single_modpost
1701         @:
1702 $(single-no-ko): descend
1703         @:
1704
1705 ifeq ($(KBUILD_EXTMOD),)
1706 # For the single build of in-tree modules, use a temporary file to avoid
1707 # the situation of modules_install installing an invalid modules.order.
1708 MODORDER := .modules.tmp
1709 endif
1710
1711 PHONY += single_modpost
1712 single_modpost: $(single-no-ko)
1713         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1714         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1715
1716 KBUILD_MODULES := 1
1717
1718 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1719
1720 # trim unrelated directories
1721 build-dirs := $(foreach d, $(build-dirs), \
1722                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1723
1724 endif
1725
1726 # Handle descending into subdirectories listed in $(build-dirs)
1727 # Preset locale variables to speed up the build process. Limit locale
1728 # tweaks to this spot to avoid wrong language settings when running
1729 # make menuconfig etc.
1730 # Error messages still appears in the original language
1731 PHONY += descend $(build-dirs)
1732 descend: $(build-dirs)
1733 $(build-dirs): prepare
1734         $(Q)$(MAKE) $(build)=$@ \
1735         single-build=$(if $(filter-out $@/, $(single-no-ko)),1) \
1736         need-builtin=1 need-modorder=1
1737
1738 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1739 PHONY += $(clean-dirs) clean
1740 $(clean-dirs):
1741         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1742
1743 clean: $(clean-dirs)
1744         $(call cmd,rmdirs)
1745         $(call cmd,rmfiles)
1746         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1747                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1748                 -o -name '*.ko.*' \
1749                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1750                 -o -name '*.dwo' -o -name '*.lst' \
1751                 -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
1752                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1753                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1754                 -o -name '*.asn1.[ch]' \
1755                 -o -name '*.symtypes' -o -name 'modules.order' \
1756                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1757                 -o -name '*.c.[012]*.*' \
1758                 -o -name '*.ll' \
1759                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1760
1761 # Generate tags for editors
1762 # ---------------------------------------------------------------------------
1763 quiet_cmd_tags = GEN     $@
1764       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1765
1766 tags TAGS cscope gtags: FORCE
1767         $(call cmd,tags)
1768
1769 # Script to generate missing namespace dependencies
1770 # ---------------------------------------------------------------------------
1771
1772 PHONY += nsdeps
1773
1774 nsdeps: modules
1775         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
1776         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1777
1778 # Scripts to check various things for consistency
1779 # ---------------------------------------------------------------------------
1780
1781 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1782
1783 includecheck:
1784         find $(srctree)/* $(RCS_FIND_IGNORE) \
1785                 -name '*.[hcS]' -type f -print | sort \
1786                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1787
1788 versioncheck:
1789         find $(srctree)/* $(RCS_FIND_IGNORE) \
1790                 -name '*.[hcS]' -type f -print | sort \
1791                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1792
1793 coccicheck:
1794         $(Q)$(BASH) $(srctree)/scripts/$@
1795
1796 namespacecheck:
1797         $(PERL) $(srctree)/scripts/namespace.pl
1798
1799 export_report:
1800         $(PERL) $(srctree)/scripts/export_report.pl
1801
1802 PHONY += checkstack kernelrelease kernelversion image_name
1803
1804 # UML needs a little special treatment here.  It wants to use the host
1805 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1806 # else wants $(ARCH), including people doing cross-builds, which means
1807 # that $(SUBARCH) doesn't work here.
1808 ifeq ($(ARCH), um)
1809 CHECKSTACK_ARCH := $(SUBARCH)
1810 else
1811 CHECKSTACK_ARCH := $(ARCH)
1812 endif
1813 checkstack:
1814         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1815         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1816
1817 kernelrelease:
1818         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1819
1820 kernelversion:
1821         @echo $(KERNELVERSION)
1822
1823 image_name:
1824         @echo $(KBUILD_IMAGE)
1825
1826 # Clear a bunch of variables before executing the submake
1827
1828 ifeq ($(quiet),silent_)
1829 tools_silent=s
1830 endif
1831
1832 tools/: FORCE
1833         $(Q)mkdir -p $(objtree)/tools
1834         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1835
1836 tools/%: FORCE
1837         $(Q)mkdir -p $(objtree)/tools
1838         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1839
1840 # FIXME Should go into a make.lib or something
1841 # ===========================================================================
1842
1843 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1844       cmd_rmdirs = rm -rf $(rm-dirs)
1845
1846 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1847       cmd_rmfiles = rm -f $(rm-files)
1848
1849 # Run depmod only if we have System.map and depmod is executable
1850 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1851       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1852                    $(KERNELRELEASE)
1853
1854 # read saved command lines for existing targets
1855 existing-targets := $(wildcard $(sort $(targets)))
1856
1857 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1858
1859 endif # config-targets
1860 endif # mixed-build
1861 endif # need-sub-make
1862
1863 PHONY += FORCE
1864 FORCE:
1865
1866 # Declare the contents of the PHONY variable as phony.  We keep that
1867 # information in a variable so we can use it in if_changed and friends.
1868 .PHONY: $(PHONY)