Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 7
   4 SUBLEVEL = 10
   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 := $(shell getconf LFS_LIBS 2>/dev/null)
 401
 402 ifneq ($(LLVM),)
 403 HOSTCC  = clang
 404 HOSTCXX = clang++
 405 else
 406 HOSTCC  = gcc
 407 HOSTCXX = g++
 408 endif
 409 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 410                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 411                 $(HOSTCFLAGS)
 412 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 413 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 414 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 415
 416 # Make variables (CC, etc...)
 417 CPP             = $(CC) -E
 418 ifneq ($(LLVM),)
 419 CC              = clang
 420 LD              = ld.lld
 421 AR              = llvm-ar
 422 NM              = llvm-nm
 423 OBJCOPY         = llvm-objcopy
 424 OBJDUMP         = llvm-objdump
 425 READELF         = llvm-readelf
 426 OBJSIZE         = llvm-size
 427 STRIP           = llvm-strip
 428 else
 429 CC              = $(CROSS_COMPILE)gcc
 430 LD              = $(CROSS_COMPILE)ld
 431 AR              = $(CROSS_COMPILE)ar
 432 NM              = $(CROSS_COMPILE)nm
 433 OBJCOPY         = $(CROSS_COMPILE)objcopy
 434 OBJDUMP         = $(CROSS_COMPILE)objdump
 435 READELF         = $(CROSS_COMPILE)readelf
 436 OBJSIZE         = $(CROSS_COMPILE)size
 437 STRIP           = $(CROSS_COMPILE)strip
 438 endif
 439 PAHOLE          = pahole
 440 LEX             = flex
 441 YACC            = bison
 442 AWK             = awk
 443 INSTALLKERNEL  := installkernel
 444 DEPMOD          = /sbin/depmod
 445 PERL            = perl
 446 PYTHON          = python
 447 PYTHON3         = python3
 448 CHECK           = sparse
 449 BASH            = bash
 450
 451 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 452                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 453 NOSTDINC_FLAGS :=
 454 CFLAGS_MODULE   =
 455 AFLAGS_MODULE   =
 456 LDFLAGS_MODULE  =
 457 CFLAGS_KERNEL   =
 458 AFLAGS_KERNEL   =
 459 LDFLAGS_vmlinux =
 460
 461 # Use USERINCLUDE when you must reference the UAPI directories only.
 462 USERINCLUDE    := \
 463                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 464                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 465                 -I$(srctree)/include/uapi \
 466                 -I$(objtree)/include/generated/uapi \
 467                 -include $(srctree)/include/linux/kconfig.h
 468
 469 # Use LINUXINCLUDE when you must reference the include/ directory.
 470 # Needed to be compatible with the O= option
 471 LINUXINCLUDE    := \
 472                 -I$(srctree)/arch/$(SRCARCH)/include \
 473                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 474                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 475                 -I$(objtree)/include \
 476                 $(USERINCLUDE)
 477
 478 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 479 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 480                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 481                    -Werror=implicit-function-declaration -Werror=implicit-int \
 482                    -Wno-format-security \
 483                    -std=gnu89
 484 KBUILD_CPPFLAGS := -D__KERNEL__
 485 KBUILD_AFLAGS_KERNEL :=
 486 KBUILD_CFLAGS_KERNEL :=
 487 KBUILD_AFLAGS_MODULE  := -DMODULE
 488 KBUILD_CFLAGS_MODULE  := -DMODULE
 489 KBUILD_LDFLAGS_MODULE :=
 490 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 491 KBUILD_LDFLAGS :=
 492 GCC_PLUGINS_CFLAGS :=
 493 CLANG_FLAGS :=
 494
 495 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
 496 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
 497 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 498 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 499
 500 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 501 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 502 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 503 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 504 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 505 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 506
 507 # Files to ignore in find ... statements
 508
 509 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 510                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 511                           -prune -o
 512 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 513                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 514
 515 # ===========================================================================
 516 # Rules shared between *config targets and build targets
 517
 518 # Basic helpers built in scripts/basic/
 519 PHONY += scripts_basic
 520 scripts_basic:
 521         $(Q)$(MAKE) $(build)=scripts/basic
 522         $(Q)rm -f .tmp_quiet_recordmcount
 523
 524 PHONY += outputmakefile
 525 # Before starting out-of-tree build, make sure the source tree is clean.
 526 # outputmakefile generates a Makefile in the output directory, if using a
 527 # separate output directory. This allows convenient use of make in the
 528 # output directory.
 529 # At the same time when output Makefile generated, generate .gitignore to
 530 # ignore whole output directory
 531 outputmakefile:
 532 ifdef building_out_of_srctree
 533         $(Q)if [ -f $(srctree)/.config -o \
 534                  -d $(srctree)/include/config -o \
 535                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 536                 echo >&2 "***"; \
 537                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 538                 echo >&2 "*** in $(abs_srctree)";\
 539                 echo >&2 "***"; \
 540                 false; \
 541         fi
 542         $(Q)ln -fsn $(srctree) source
 543         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 544         $(Q)test -e .gitignore || \
 545         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 546 endif
 547
 548 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 549 ifneq ($(CROSS_COMPILE),)
 550 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 551 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 552 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 553 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 554 endif
 555 ifneq ($(GCC_TOOLCHAIN),)
 556 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 557 endif
 558 ifneq ($(LLVM_IAS),1)
 559 CLANG_FLAGS     += -no-integrated-as
 560 endif
 561 CLANG_FLAGS     += -Werror=unknown-warning-option
 562 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 563 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 564 export CLANG_FLAGS
 565 endif
 566
 567 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 568 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 569 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 570 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 571 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 572
 573 ifdef config-build
 574 # ===========================================================================
 575 # *config targets only - make sure prerequisites are updated, and descend
 576 # in scripts/kconfig to make the *config target
 577
 578 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 579 # KBUILD_DEFCONFIG may point out an alternative default configuration
 580 # used for 'make defconfig'
 581 include arch/$(SRCARCH)/Makefile
 582 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 583
 584 config: outputmakefile scripts_basic FORCE
 585         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 586
 587 %config: outputmakefile scripts_basic FORCE
 588         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 589
 590 else #!config-build
 591 # ===========================================================================
 592 # Build targets only - this includes vmlinux, arch specific targets, clean
 593 # targets and others. In general all targets except *config targets.
 594
 595 # If building an external module we do not care about the all: rule
 596 # but instead _all depend on modules
 597 PHONY += all
 598 ifeq ($(KBUILD_EXTMOD),)
 599 _all: all
 600 else
 601 _all: modules
 602 endif
 603
 604 # Decide whether to build built-in, modular, or both.
 605 # Normally, just do built-in.
 606
 607 KBUILD_MODULES :=
 608 KBUILD_BUILTIN := 1
 609
 610 # If we have only "make modules", don't compile built-in objects.
 611 ifeq ($(MAKECMDGOALS),modules)
 612   KBUILD_BUILTIN :=
 613 endif
 614
 615 # If we have "make <whatever> modules", compile modules
 616 # in addition to whatever we do anyway.
 617 # Just "make" or "make all" shall build modules as well
 618
 619 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 620   KBUILD_MODULES := 1
 621 endif
 622
 623 ifeq ($(MAKECMDGOALS),)
 624   KBUILD_MODULES := 1
 625 endif
 626
 627 export KBUILD_MODULES KBUILD_BUILTIN
 628
 629 ifdef need-config
 630 include include/config/auto.conf
 631 endif
 632
 633 ifeq ($(KBUILD_EXTMOD),)
 634 # Objects we will link into vmlinux / subdirs we need to visit
 635 init-y          := init/
 636 drivers-y       := drivers/ sound/
 637 drivers-$(CONFIG_SAMPLES) += samples/
 638 net-y           := net/
 639 libs-y          := lib/
 640 core-y          := usr/
 641 virt-y          := virt/
 642 endif # KBUILD_EXTMOD
 643
 644 # The all: target is the default when no target is given on the
 645 # command line.
 646 # This allow a user to issue only 'make' to build a kernel including modules
 647 # Defaults to vmlinux, but the arch makefile usually adds further targets
 648 all: vmlinux
 649
 650 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 651         $(call cc-option,-fno-tree-loop-im) \
 652         $(call cc-disable-warning,maybe-uninitialized,)
 653 export CFLAGS_GCOV
 654
 655 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 656 ifdef CONFIG_FUNCTION_TRACER
 657   CC_FLAGS_FTRACE := -pg
 658 endif
 659
 660 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 661 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 662 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 663 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 664 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 665 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 666 export RETPOLINE_CFLAGS
 667 export RETPOLINE_VDSO_CFLAGS
 668
 669 include arch/$(SRCARCH)/Makefile
 670
 671 ifdef need-config
 672 ifdef may-sync-config
 673 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 674 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 675 # because some architectures define CROSS_COMPILE there.
 676 include include/config/auto.conf.cmd
 677
 678 $(KCONFIG_CONFIG):
 679         @echo >&2 '***'
 680         @echo >&2 '*** Configuration file "$@" not found!'
 681         @echo >&2 '***'
 682         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 683         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 684         @echo >&2 '***'
 685         @/bin/false
 686
 687 # The actual configuration files used during the build are stored in
 688 # include/generated/ and include/config/. Update them if .config is newer than
 689 # include/config/auto.conf (which mirrors .config).
 690 #
 691 # This exploits the 'multi-target pattern rule' trick.
 692 # The syncconfig should be executed only once to make all the targets.
 693 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 694 %/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
 695         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 696 else # !may-sync-config
 697 # External modules and some install targets need include/generated/autoconf.h
 698 # and include/config/auto.conf but do not care if they are up-to-date.
 699 # Use auto.conf to trigger the test
 700 PHONY += include/config/auto.conf
 701
 702 include/config/auto.conf:
 703         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 704         echo >&2;                                                       \
 705         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 706         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 707         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 708         echo >&2 ;                                                      \
 709         /bin/false)
 710
 711 endif # may-sync-config
 712 endif # need-config
 713
 714 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 715 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 716 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 717 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 718 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 719
 720 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 721 KBUILD_CFLAGS += -O2
 722 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 723 KBUILD_CFLAGS += -O3
 724 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 725 KBUILD_CFLAGS += -Os
 726 endif
 727
 728 # Tell gcc to never replace conditional load with a non-conditional one
 729 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 730 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 731
 732 include scripts/Makefile.kcov
 733 include scripts/Makefile.gcc-plugins
 734
 735 ifdef CONFIG_READABLE_ASM
 736 # Disable optimizations that make assembler listings hard to read.
 737 # reorder blocks reorders the control in the function
 738 # ipa clone creates specialized cloned functions
 739 # partial inlining inlines only parts of functions
 740 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 741                  $(call cc-option,-fno-ipa-cp-clone,) \
 742                  $(call cc-option,-fno-partial-inlining)
 743 endif
 744
 745 ifneq ($(CONFIG_FRAME_WARN),0)
 746 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 747 endif
 748
 749 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 750 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 751 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 752
 753 KBUILD_CFLAGS += $(stackp-flags-y)
 754
 755 ifdef CONFIG_CC_IS_CLANG
 756 KBUILD_CPPFLAGS += -Qunused-arguments
 757 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 758 KBUILD_CFLAGS += -Wno-gnu
 759 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 760 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 761 # See modpost pattern 2
 762 KBUILD_CFLAGS += -mno-global-merge
 763 else
 764
 765 # These warnings generated too much noise in a regular build.
 766 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 767 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 768
 769 # Warn about unmarked fall-throughs in switch statement.
 770 # Disabled for clang while comment to attribute conversion happens and
 771 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 772 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 773 endif
 774
 775 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 776 ifdef CONFIG_FRAME_POINTER
 777 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 778 else
 779 # Some targets (ARM with Thumb2, for example), can't be built with frame
 780 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 781 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 782 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 783 # -fomit-frame-pointer with FUNCTION_TRACER.
 784 ifndef CONFIG_FUNCTION_TRACER
 785 KBUILD_CFLAGS   += -fomit-frame-pointer
 786 endif
 787 endif
 788
 789 # Initialize all stack variables with a pattern, if desired.
 790 ifdef CONFIG_INIT_STACK_ALL
 791 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 792 endif
 793
 794 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 795
 796 ifdef CONFIG_DEBUG_INFO
 797 ifdef CONFIG_DEBUG_INFO_SPLIT
 798 DEBUG_CFLAGS    += -gsplit-dwarf
 799 else
 800 DEBUG_CFLAGS    += -g
 801 endif
 802 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 803 endif
 804 ifdef CONFIG_DEBUG_INFO_DWARF4
 805 DEBUG_CFLAGS    += -gdwarf-4
 806 endif
 807
 808 ifdef CONFIG_DEBUG_INFO_REDUCED
 809 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 810                    $(call cc-option,-fno-var-tracking)
 811 endif
 812
 813 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 814 export DEBUG_CFLAGS
 815
 816 ifdef CONFIG_FUNCTION_TRACER
 817 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 818   # gcc 5 supports generating the mcount tables directly
 819   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 820     CC_FLAGS_FTRACE     += -mrecord-mcount
 821     export CC_USING_RECORD_MCOUNT := 1
 822   endif
 823   ifdef CONFIG_HAVE_NOP_MCOUNT
 824     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 825       CC_FLAGS_FTRACE   += -mnop-mcount
 826       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 827     endif
 828   endif
 829 endif
 830 ifdef CONFIG_HAVE_FENTRY
 831   ifeq ($(call cc-option-yn, -mfentry),y)
 832     CC_FLAGS_FTRACE     += -mfentry
 833     CC_FLAGS_USING      += -DCC_USING_FENTRY
 834   endif
 835 endif
 836 export CC_FLAGS_FTRACE
 837 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 838 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 839 ifdef CONFIG_DYNAMIC_FTRACE
 840         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 841                 BUILD_C_RECORDMCOUNT := y
 842                 export BUILD_C_RECORDMCOUNT
 843         endif
 844 endif
 845 endif
 846
 847 # We trigger additional mismatches with less inlining
 848 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 849 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 850 endif
 851
 852 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 853 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 854 LDFLAGS_vmlinux += --gc-sections
 855 endif
 856
 857 ifdef CONFIG_LIVEPATCH
 858 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 859 endif
 860
 861 # arch Makefile may override CC so keep this after arch Makefile is included
 862 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 863
 864 # warn about C99 declaration after statement
 865 KBUILD_CFLAGS += -Wdeclaration-after-statement
 866
 867 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 868 KBUILD_CFLAGS += -Wvla
 869
 870 # disable pointer signed / unsigned warnings in gcc 4.0
 871 KBUILD_CFLAGS += -Wno-pointer-sign
 872
 873 # disable stringop warnings in gcc 8+
 874 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 875
 876 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 877 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 878 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 879 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 880
 881 # Another good warning that we'll want to enable eventually
 882 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 883
 884 # Enabled with W=2, disabled by default as noisy
 885 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 886
 887 # disable invalid "can't wrap" optimizations for signed / pointers
 888 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 889
 890 # clang sets -fmerge-all-constants by default as optimization, but this
 891 # is non-conforming behavior for C and in fact breaks the kernel, so we
 892 # need to disable it here generally.
 893 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 894
 895 # for gcc -fno-merge-all-constants disables everything, but it is fine
 896 # to have actual conforming behavior enabled.
 897 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 898
 899 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 900 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 901
 902 # conserve stack if available
 903 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 904
 905 # Prohibit date/time macros, which would make the build non-deterministic
 906 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 907
 908 # enforce correct pointer usage
 909 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 910
 911 # Require designated initializers for all marked structures
 912 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 913
 914 # change __FILE__ to the relative path from the srctree
 915 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 916
 917 # ensure -fcf-protection is disabled when using retpoline as it is
 918 # incompatible with -mindirect-branch=thunk-extern
 919 ifdef CONFIG_RETPOLINE
 920 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 921 endif
 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
 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 = gzip -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 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1038
1039 ifeq ($(KBUILD_EXTMOD),)
1040 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1041
1042 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1043                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1044                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1045
1046 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1047                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1048                         $(drivers-) $(net-) $(libs-) $(virt-))))
1049
1050 build-dirs      := $(vmlinux-dirs)
1051 clean-dirs      := $(vmlinux-alldirs)
1052
1053 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1054 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1055 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1056 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1057 libs-y2         := $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y)))
1058 ifdef CONFIG_MODULES
1059 libs-y1         := $(filter-out %/, $(libs-y))
1060 libs-y2         += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1061 else
1062 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1063 endif
1064 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1065
1066 # Externally visible symbols (used by link-vmlinux.sh)
1067 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1068                               $(drivers-y) $(net-y) $(virt-y)
1069 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1070 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1071 export LDFLAGS_vmlinux
1072 # used by scripts/Makefile.package
1073 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1074
1075 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1076
1077 # Recurse until adjust_autoksyms.sh is satisfied
1078 PHONY += autoksyms_recursive
1079 ifdef CONFIG_TRIM_UNUSED_KSYMS
1080 autoksyms_recursive: descend modules.order
1081         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1082           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1083 endif
1084
1085 # For the kernel to actually contain only the needed exported symbols,
1086 # we have to build modules as well to determine what those symbols are.
1087 # (this can be evaluated only once include/config/auto.conf has been included)
1088 ifdef CONFIG_TRIM_UNUSED_KSYMS
1089   KBUILD_MODULES := 1
1090 endif
1091
1092 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1093
1094 quiet_cmd_autoksyms_h = GEN     $@
1095       cmd_autoksyms_h = mkdir -p $(dir $@); \
1096                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1097
1098 $(autoksyms_h):
1099         $(call cmd,autoksyms_h)
1100
1101 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1102
1103 # Final link of vmlinux with optional arch pass after final link
1104 cmd_link-vmlinux =                                                 \
1105         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1106         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1107
1108 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1109         +$(call if_changed,link-vmlinux)
1110
1111 targets := vmlinux
1112
1113 # The actual objects are generated when descending,
1114 # make sure no implicit rule kicks in
1115 $(sort $(vmlinux-deps)): descend ;
1116
1117 filechk_kernel.release = \
1118         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1119
1120 # Store (new) KERNELRELEASE string in include/config/kernel.release
1121 include/config/kernel.release: FORCE
1122         $(call filechk,kernel.release)
1123
1124 # Additional helpers built in scripts/
1125 # Carefully list dependencies so we do not try to build scripts twice
1126 # in parallel
1127 PHONY += scripts
1128 scripts: scripts_basic scripts_dtc
1129         $(Q)$(MAKE) $(build)=$(@)
1130
1131 # Things we need to do before we recursively start building the kernel
1132 # or the modules are listed in "prepare".
1133 # A multi level approach is used. prepareN is processed before prepareN-1.
1134 # archprepare is used in arch Makefiles and when processed asm symlink,
1135 # version.h and scripts_basic is processed / created.
1136
1137 PHONY += prepare archprepare
1138
1139 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1140         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1141
1142 prepare0: archprepare
1143         $(Q)$(MAKE) $(build)=scripts/mod
1144         $(Q)$(MAKE) $(build)=.
1145
1146 # All the preparing..
1147 prepare: prepare0 prepare-objtool
1148
1149 # Support for using generic headers in asm-generic
1150 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1151
1152 PHONY += asm-generic uapi-asm-generic
1153 asm-generic: uapi-asm-generic
1154         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1155         generic=include/asm-generic
1156 uapi-asm-generic:
1157         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1158         generic=include/uapi/asm-generic
1159
1160 PHONY += prepare-objtool
1161 prepare-objtool: $(objtool_target)
1162 ifeq ($(SKIP_STACK_VALIDATION),1)
1163 ifdef CONFIG_UNWINDER_ORC
1164         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1165         @false
1166 else
1167         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1168 endif
1169 endif
1170
1171 # Generate some files
1172 # ---------------------------------------------------------------------------
1173
1174 # KERNELRELEASE can change from a few different places, meaning version.h
1175 # needs to be updated, so this check is forced on all builds
1176
1177 uts_len := 64
1178 define filechk_utsrelease.h
1179         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1180           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1181           exit 1;                                                         \
1182         fi;                                                               \
1183         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1184 endef
1185
1186 define filechk_version.h
1187         echo \#define LINUX_VERSION_CODE $(shell                         \
1188         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1189         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1190 endef
1191
1192 $(version_h): FORCE
1193         $(call filechk,version.h)
1194         $(Q)rm -f $(old_version_h)
1195
1196 include/generated/utsrelease.h: include/config/kernel.release FORCE
1197         $(call filechk,utsrelease.h)
1198
1199 PHONY += headerdep
1200 headerdep:
1201         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1202         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1203
1204 # ---------------------------------------------------------------------------
1205 # Kernel headers
1206
1207 #Default location for installed headers
1208 export INSTALL_HDR_PATH = $(objtree)/usr
1209
1210 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1211       cmd_headers_install = \
1212         mkdir -p $(INSTALL_HDR_PATH); \
1213         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1214         usr/include $(INSTALL_HDR_PATH)
1215
1216 PHONY += headers_install
1217 headers_install: headers
1218         $(call cmd,headers_install)
1219
1220 PHONY += archheaders archscripts
1221
1222 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1223
1224 PHONY += headers
1225 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1226         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1227           $(error Headers not exportable for the $(SRCARCH) architecture))
1228         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1229         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1230
1231 # Deprecated. It is no-op now.
1232 PHONY += headers_check
1233 headers_check:
1234         @:
1235
1236 ifdef CONFIG_HEADERS_INSTALL
1237 prepare: headers
1238 endif
1239
1240 PHONY += scripts_unifdef
1241 scripts_unifdef: scripts_basic
1242         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1243
1244 # ---------------------------------------------------------------------------
1245 # Kernel selftest
1246
1247 PHONY += kselftest
1248 kselftest:
1249         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1250
1251 kselftest-%: FORCE
1252         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1253
1254 PHONY += kselftest-merge
1255 kselftest-merge:
1256         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1257         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1258                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1259         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1260
1261 # ---------------------------------------------------------------------------
1262 # Devicetree files
1263
1264 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1265 dtstree := arch/$(SRCARCH)/boot/dts
1266 endif
1267
1268 ifneq ($(dtstree),)
1269
1270 %.dtb: include/config/kernel.release scripts_dtc
1271         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1272
1273 PHONY += dtbs dtbs_install dtbs_check
1274 dtbs: include/config/kernel.release scripts_dtc
1275         $(Q)$(MAKE) $(build)=$(dtstree)
1276
1277 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1278 export CHECK_DTBS=y
1279 dtbs: dt_binding_check
1280 endif
1281
1282 dtbs_check: dtbs
1283
1284 dtbs_install:
1285         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1286
1287 ifdef CONFIG_OF_EARLY_FLATTREE
1288 all: dtbs
1289 endif
1290
1291 endif
1292
1293 PHONY += scripts_dtc
1294 scripts_dtc: scripts_basic
1295         $(Q)$(MAKE) $(build)=scripts/dtc
1296
1297 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1298 export CHECK_DT_BINDING=y
1299 endif
1300
1301 PHONY += dt_binding_check
1302 dt_binding_check: scripts_dtc
1303         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1304
1305 # ---------------------------------------------------------------------------
1306 # Modules
1307
1308 ifdef CONFIG_MODULES
1309
1310 # By default, build modules as well
1311
1312 all: modules
1313
1314 # When we're building modules with modversions, we need to consider
1315 # the built-in objects during the descend as well, in order to
1316 # make sure the checksums are up to date before we record them.
1317 ifdef CONFIG_MODVERSIONS
1318   KBUILD_BUILTIN := 1
1319 endif
1320
1321 # Build modules
1322 #
1323 # A module can be listed more than once in obj-m resulting in
1324 # duplicate lines in modules.order files.  Those are removed
1325 # using awk while concatenating to the final file.
1326
1327 PHONY += modules
1328 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1329         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1330         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1331
1332 modules.order: descend
1333         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1334
1335 # Target to prepare building external modules
1336 PHONY += modules_prepare
1337 modules_prepare: prepare
1338
1339 # Target to install modules
1340 PHONY += modules_install
1341 modules_install: _modinst_ _modinst_post
1342
1343 PHONY += _modinst_
1344 _modinst_:
1345         @rm -rf $(MODLIB)/kernel
1346         @rm -f $(MODLIB)/source
1347         @mkdir -p $(MODLIB)/kernel
1348         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1349         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1350                 rm -f $(MODLIB)/build ; \
1351                 ln -s $(CURDIR) $(MODLIB)/build ; \
1352         fi
1353         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1354         @cp -f modules.builtin $(MODLIB)/
1355         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1356         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1357
1358 # This depmod is only for convenience to give the initial
1359 # boot a modules.dep even before / is mounted read-write.  However the
1360 # boot script depmod is the master version.
1361 PHONY += _modinst_post
1362 _modinst_post: _modinst_
1363         $(call cmd,depmod)
1364
1365 ifeq ($(CONFIG_MODULE_SIG), y)
1366 PHONY += modules_sign
1367 modules_sign:
1368         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1369 endif
1370
1371 else # CONFIG_MODULES
1372
1373 # Modules not configured
1374 # ---------------------------------------------------------------------------
1375
1376 PHONY += modules modules_install
1377 modules modules_install:
1378         @echo >&2
1379         @echo >&2 "The present kernel configuration has modules disabled."
1380         @echo >&2 "Type 'make config' and enable loadable module support."
1381         @echo >&2 "Then build a kernel with module support enabled."
1382         @echo >&2
1383         @exit 1
1384
1385 endif # CONFIG_MODULES
1386
1387 ###
1388 # Cleaning is done on three levels.
1389 # make clean     Delete most generated files
1390 #                Leave enough to build external modules
1391 # make mrproper  Delete the current configuration, and all generated files
1392 # make distclean Remove editor backup files, patch leftover files and the like
1393
1394 # Directories & files removed with 'make clean'
1395 CLEAN_DIRS  += include/ksym
1396 CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
1397
1398 # Directories & files removed with 'make mrproper'
1399 MRPROPER_DIRS  += include/config include/generated          \
1400                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1401                   debian/ snap/ tar-install/
1402 MRPROPER_FILES += .config .config.old .version \
1403                   Module.symvers \
1404                   signing_key.pem signing_key.priv signing_key.x509     \
1405                   x509.genkey extra_certificates signing_key.x509.keyid \
1406                   signing_key.x509.signer vmlinux-gdb.py \
1407                   *.spec
1408
1409 # Directories & files removed with 'make distclean'
1410 DISTCLEAN_DIRS  +=
1411 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1412
1413 # clean - Delete most, but leave enough to build external modules
1414 #
1415 clean: rm-dirs  := $(CLEAN_DIRS)
1416 clean: rm-files := $(CLEAN_FILES)
1417
1418 PHONY += archclean vmlinuxclean
1419
1420 vmlinuxclean:
1421         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1422         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1423
1424 clean: archclean vmlinuxclean
1425
1426 # mrproper - Delete all generated files, including .config
1427 #
1428 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1429 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1430 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1431
1432 PHONY += $(mrproper-dirs) mrproper
1433 $(mrproper-dirs):
1434         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1435
1436 mrproper: clean $(mrproper-dirs)
1437         $(call cmd,rmdirs)
1438         $(call cmd,rmfiles)
1439
1440 # distclean
1441 #
1442 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1443 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1444
1445 PHONY += distclean
1446
1447 distclean: mrproper
1448         $(call cmd,rmdirs)
1449         $(call cmd,rmfiles)
1450         @find $(srctree) $(RCS_FIND_IGNORE) \
1451                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1452                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1453                 -o -name 'core' \) \
1454                 -type f -print | xargs rm -f
1455
1456
1457 # Packaging of the kernel to various formats
1458 # ---------------------------------------------------------------------------
1459
1460 %src-pkg: FORCE
1461         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1462 %pkg: include/config/kernel.release FORCE
1463         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1464
1465 # Brief documentation of the typical targets used
1466 # ---------------------------------------------------------------------------
1467
1468 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1469 boards := $(sort $(notdir $(boards)))
1470 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1471 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1472
1473 PHONY += help
1474 help:
1475         @echo  'Cleaning targets:'
1476         @echo  '  clean           - Remove most generated files but keep the config and'
1477         @echo  '                    enough build support to build external modules'
1478         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1479         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1480         @echo  ''
1481         @echo  'Configuration targets:'
1482         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1483         @echo  ''
1484         @echo  'Other generic targets:'
1485         @echo  '  all             - Build all targets marked with [*]'
1486         @echo  '* vmlinux         - Build the bare kernel'
1487         @echo  '* modules         - Build all modules'
1488         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1489         @echo  '  dir/            - Build all files in dir and below'
1490         @echo  '  dir/file.[ois]  - Build specified target only'
1491         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1492         @echo  '                    (requires compiler support for LLVM assembly generation)'
1493         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1494         @echo  '                    (requires a recent binutils and recent build (System.map))'
1495         @echo  '  dir/file.ko     - Build module including final link'
1496         @echo  '  modules_prepare - Set up for building external modules'
1497         @echo  '  tags/TAGS       - Generate tags file for editors'
1498         @echo  '  cscope          - Generate cscope index'
1499         @echo  '  gtags           - Generate GNU GLOBAL index'
1500         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1501         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1502         @echo  '  image_name      - Output the image name (use with make -s)'
1503         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1504          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1505          echo  ''
1506         @echo  'Static analysers:'
1507         @echo  '  checkstack      - Generate a list of stack hogs'
1508         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1509         @echo  '  versioncheck    - Sanity check on version.h usage'
1510         @echo  '  includecheck    - Check for duplicate included header files'
1511         @echo  '  export_report   - List the usages of all exported symbols'
1512         @echo  '  headerdep       - Detect inclusion cycles in headers'
1513         @echo  '  coccicheck      - Check with Coccinelle'
1514         @echo  ''
1515         @echo  'Tools:'
1516         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1517         @echo  ''
1518         @echo  'Kernel selftest:'
1519         @echo  '  kselftest         - Build and run kernel selftest'
1520         @echo  '                      Build, install, and boot kernel before'
1521         @echo  '                      running kselftest on it'
1522         @echo  '                      Run as root for full coverage'
1523         @echo  '  kselftest-all     - Build kernel selftest'
1524         @echo  '  kselftest-install - Build and install kernel selftest'
1525         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1526         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1527         @echo  '                      kselftest to existing .config.'
1528         @echo  ''
1529         @$(if $(dtstree), \
1530                 echo 'Devicetree:'; \
1531                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1532                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1533                 echo '  dt_binding_check - Validate device tree binding documents'; \
1534                 echo '  dtbs_check       - Validate device tree source files';\
1535                 echo '')
1536
1537         @echo 'Userspace tools targets:'
1538         @echo '  use "make tools/help"'
1539         @echo '  or  "cd tools; make help"'
1540         @echo  ''
1541         @echo  'Kernel packaging:'
1542         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1543         @echo  ''
1544         @echo  'Documentation targets:'
1545         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1546         @echo  ''
1547         @echo  'Architecture specific targets ($(SRCARCH)):'
1548         @$(if $(archhelp),$(archhelp),\
1549                 echo '  No architecture specific help defined for $(SRCARCH)')
1550         @echo  ''
1551         @$(if $(boards), \
1552                 $(foreach b, $(boards), \
1553                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1554                 echo '')
1555         @$(if $(board-dirs), \
1556                 $(foreach b, $(board-dirs), \
1557                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1558                 printf "  %-16s - Show all of the above\\n" help-boards; \
1559                 echo '')
1560
1561         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1562         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1563         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1564         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1565         @echo  '                       (sparse by default)'
1566         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1567         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1568         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1569         @echo  '                1: warnings which may be relevant and do not occur too often'
1570         @echo  '                2: warnings which occur quite often but may still be relevant'
1571         @echo  '                3: more obscure warnings, can most likely be ignored'
1572         @echo  '                Multiple levels can be combined with W=12 or W=123'
1573         @echo  ''
1574         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1575         @echo  'For further info see the ./README file'
1576
1577
1578 help-board-dirs := $(addprefix help-,$(board-dirs))
1579
1580 help-boards: $(help-board-dirs)
1581
1582 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1583
1584 $(help-board-dirs): help-%:
1585         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1586         @$(if $(boards-per-dir), \
1587                 $(foreach b, $(boards-per-dir), \
1588                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1589                 echo '')
1590
1591
1592 # Documentation targets
1593 # ---------------------------------------------------------------------------
1594 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1595                linkcheckdocs dochelp refcheckdocs
1596 PHONY += $(DOC_TARGETS)
1597 $(DOC_TARGETS):
1598         $(Q)$(MAKE) $(build)=Documentation $@
1599
1600 # Misc
1601 # ---------------------------------------------------------------------------
1602
1603 PHONY += scripts_gdb
1604 scripts_gdb: prepare0
1605         $(Q)$(MAKE) $(build)=scripts/gdb
1606         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1607
1608 ifdef CONFIG_GDB_SCRIPTS
1609 all: scripts_gdb
1610 endif
1611
1612 else # KBUILD_EXTMOD
1613
1614 ###
1615 # External module support.
1616 # When building external modules the kernel used as basis is considered
1617 # read-only, and no consistency checks are made and the make
1618 # system is not used on the basis kernel. If updates are required
1619 # in the basis kernel ordinary make commands (without M=...) must
1620 # be used.
1621 #
1622 # The following are the only valid targets when building external
1623 # modules.
1624 # make M=dir clean     Delete all automatically generated files
1625 # make M=dir modules   Make all modules in specified dir
1626 # make M=dir           Same as 'make M=dir modules'
1627 # make M=dir modules_install
1628 #                      Install the modules built in the module directory
1629 #                      Assumes install directory is already created
1630
1631 # We are always building modules
1632 KBUILD_MODULES := 1
1633
1634 PHONY += $(objtree)/Module.symvers
1635 $(objtree)/Module.symvers:
1636         @test -e $(objtree)/Module.symvers || ( \
1637         echo; \
1638         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1639         echo "           is missing; modules will have no dependencies and modversions."; \
1640         echo )
1641
1642 build-dirs := $(KBUILD_EXTMOD)
1643 PHONY += modules
1644 modules: descend $(objtree)/Module.symvers
1645         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1646
1647 PHONY += modules_install
1648 modules_install: _emodinst_ _emodinst_post
1649
1650 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1651 PHONY += _emodinst_
1652 _emodinst_:
1653         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1654         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1655
1656 PHONY += _emodinst_post
1657 _emodinst_post: _emodinst_
1658         $(call cmd,depmod)
1659
1660 clean-dirs := $(KBUILD_EXTMOD)
1661 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1662
1663 PHONY += /
1664 /:
1665         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1666
1667 PHONY += help
1668 help:
1669         @echo  '  Building external modules.'
1670         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1671         @echo  ''
1672         @echo  '  modules         - default target, build the module(s)'
1673         @echo  '  modules_install - install the module'
1674         @echo  '  clean           - remove generated files in module directory only'
1675         @echo  ''
1676
1677 PHONY += prepare
1678 endif # KBUILD_EXTMOD
1679
1680 # Single targets
1681 # ---------------------------------------------------------------------------
1682 # To build individual files in subdirectories, you can do like this:
1683 #
1684 #   make foo/bar/baz.s
1685 #
1686 # The supported suffixes for single-target are listed in 'single-targets'
1687 #
1688 # To build only under specific subdirectories, you can do like this:
1689 #
1690 #   make foo/bar/baz/
1691
1692 ifdef single-build
1693
1694 # .ko is special because modpost is needed
1695 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1696 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1697
1698 $(single-ko): single_modpost
1699         @:
1700 $(single-no-ko): descend
1701         @:
1702
1703 ifeq ($(KBUILD_EXTMOD),)
1704 # For the single build of in-tree modules, use a temporary file to avoid
1705 # the situation of modules_install installing an invalid modules.order.
1706 MODORDER := .modules.tmp
1707 endif
1708
1709 PHONY += single_modpost
1710 single_modpost: $(single-no-ko)
1711         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1712         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1713
1714 KBUILD_MODULES := 1
1715
1716 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1717
1718 # trim unrelated directories
1719 build-dirs := $(foreach d, $(build-dirs), \
1720                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1721
1722 endif
1723
1724 # Handle descending into subdirectories listed in $(build-dirs)
1725 # Preset locale variables to speed up the build process. Limit locale
1726 # tweaks to this spot to avoid wrong language settings when running
1727 # make menuconfig etc.
1728 # Error messages still appears in the original language
1729 PHONY += descend $(build-dirs)
1730 descend: $(build-dirs)
1731 $(build-dirs): prepare
1732         $(Q)$(MAKE) $(build)=$@ \
1733         single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1734         need-builtin=1 need-modorder=1
1735
1736 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1737 PHONY += $(clean-dirs) clean
1738 $(clean-dirs):
1739         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1740
1741 clean: $(clean-dirs)
1742         $(call cmd,rmdirs)
1743         $(call cmd,rmfiles)
1744         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1745                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1746                 -o -name '*.ko.*' \
1747                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1748                 -o -name '*.dwo' -o -name '*.lst' \
1749                 -o -name '*.su' -o -name '*.mod' \
1750                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1751                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1752                 -o -name '*.asn1.[ch]' \
1753                 -o -name '*.symtypes' -o -name 'modules.order' \
1754                 -o -name '.tmp_*.o.*' \
1755                 -o -name '*.c.[012]*.*' \
1756                 -o -name '*.ll' \
1757                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1758
1759 # Generate tags for editors
1760 # ---------------------------------------------------------------------------
1761 quiet_cmd_tags = GEN     $@
1762       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1763
1764 tags TAGS cscope gtags: FORCE
1765         $(call cmd,tags)
1766
1767 # Script to generate missing namespace dependencies
1768 # ---------------------------------------------------------------------------
1769
1770 PHONY += nsdeps
1771 nsdeps: export KBUILD_NSDEPS=1
1772 nsdeps: modules
1773         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1774
1775 # Scripts to check various things for consistency
1776 # ---------------------------------------------------------------------------
1777
1778 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1779
1780 includecheck:
1781         find $(srctree)/* $(RCS_FIND_IGNORE) \
1782                 -name '*.[hcS]' -type f -print | sort \
1783                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1784
1785 versioncheck:
1786         find $(srctree)/* $(RCS_FIND_IGNORE) \
1787                 -name '*.[hcS]' -type f -print | sort \
1788                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1789
1790 coccicheck:
1791         $(Q)$(BASH) $(srctree)/scripts/$@
1792
1793 namespacecheck:
1794         $(PERL) $(srctree)/scripts/namespace.pl
1795
1796 export_report:
1797         $(PERL) $(srctree)/scripts/export_report.pl
1798
1799 PHONY += checkstack kernelrelease kernelversion image_name
1800
1801 # UML needs a little special treatment here.  It wants to use the host
1802 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1803 # else wants $(ARCH), including people doing cross-builds, which means
1804 # that $(SUBARCH) doesn't work here.
1805 ifeq ($(ARCH), um)
1806 CHECKSTACK_ARCH := $(SUBARCH)
1807 else
1808 CHECKSTACK_ARCH := $(ARCH)
1809 endif
1810 checkstack:
1811         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1812         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1813
1814 kernelrelease:
1815         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1816
1817 kernelversion:
1818         @echo $(KERNELVERSION)
1819
1820 image_name:
1821         @echo $(KBUILD_IMAGE)
1822
1823 # Clear a bunch of variables before executing the submake
1824
1825 ifeq ($(quiet),silent_)
1826 tools_silent=s
1827 endif
1828
1829 tools/: FORCE
1830         $(Q)mkdir -p $(objtree)/tools
1831         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1832
1833 tools/%: FORCE
1834         $(Q)mkdir -p $(objtree)/tools
1835         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1836
1837 # FIXME Should go into a make.lib or something
1838 # ===========================================================================
1839
1840 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1841       cmd_rmdirs = rm -rf $(rm-dirs)
1842
1843 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1844       cmd_rmfiles = rm -f $(rm-files)
1845
1846 # Run depmod only if we have System.map and depmod is executable
1847 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1848       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1849                    $(KERNELRELEASE)
1850
1851 # read saved command lines for existing targets
1852 existing-targets := $(wildcard $(sort $(targets)))
1853
1854 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1855
1856 endif # config-build
1857 endif # mixed-build
1858 endif # need-sub-make
1859
1860 PHONY += FORCE
1861 FORCE:
1862
1863 # Declare the contents of the PHONY variable as phony.  We keep that
1864 # information in a variable so we can use it in if_changed and friends.
1865 .PHONY: $(PHONY)