Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 7
   4 SUBLEVEL = 0
   5 EXTRAVERSION =
   6 NAME = Kleptomaniac Octopus
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub_make_done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
  72 #
  73 # To put more focus on warnings, be less verbose as default
  74 # Use 'make V=1' to see the full commands
  75
  76 ifeq ("$(origin V)", "command line")
  77   KBUILD_VERBOSE = $(V)
  78 endif
  79 ifndef KBUILD_VERBOSE
  80   KBUILD_VERBOSE = 0
  81 endif
  82
  83 ifeq ($(KBUILD_VERBOSE),1)
  84   quiet =
  85   Q =
  86 else
  87   quiet=quiet_
  88   Q = @
  89 endif
  90
  91 # If the user is running make -s (silent mode), suppress echoing of
  92 # commands
  93
  94 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  95   quiet=silent_
  96 endif
  97
  98 export quiet Q KBUILD_VERBOSE
  99
 100 # Kbuild will save output files in the current working directory.
 101 # This does not need to match to the root of the kernel source tree.
 102 #
 103 # For example, you can do this:
 104 #
 105 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 106 #
 107 # If you want to save output files in a different location, there are
 108 # two syntaxes to specify it.
 109 #
 110 # 1) O=
 111 # Use "make O=dir/to/store/output/files/"
 112 #
 113 # 2) Set KBUILD_OUTPUT
 114 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 115 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 116 #
 117 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 118 # variable.
 119
 120 # Do we want to change the working directory?
 121 ifeq ("$(origin O)", "command line")
 122   KBUILD_OUTPUT := $(O)
 123 endif
 124
 125 ifneq ($(KBUILD_OUTPUT),)
 126 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 127 # expand a shell special character '~'. We use a somewhat tedious way here.
 128 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 129 $(if $(abs_objtree),, \
 130      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 131
 132 # $(realpath ...) resolves symlinks
 133 abs_objtree := $(realpath $(abs_objtree))
 134 else
 135 abs_objtree := $(CURDIR)
 136 endif # ifneq ($(KBUILD_OUTPUT),)
 137
 138 ifeq ($(abs_objtree),$(CURDIR))
 139 # Suppress "Entering directory ..." unless we are changing the work directory.
 140 MAKEFLAGS += --no-print-directory
 141 else
 142 need-sub-make := 1
 143 endif
 144
 145 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 146
 147 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 148 $(error source directory cannot contain spaces or colons)
 149 endif
 150
 151 ifneq ($(abs_srctree),$(abs_objtree))
 152 # Look for make include files relative to root of kernel src
 153 #
 154 # This does not become effective immediately because MAKEFLAGS is re-parsed
 155 # once after the Makefile is read. We need to invoke sub-make.
 156 MAKEFLAGS += --include-dir=$(abs_srctree)
 157 need-sub-make := 1
 158 endif
 159
 160 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 161 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 162 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 163 need-sub-make := 1
 164 # Cancel implicit rules for this Makefile.
 165 $(lastword $(MAKEFILE_LIST)): ;
 166 endif
 167
 168 export abs_srctree abs_objtree
 169 export sub_make_done := 1
 170
 171 ifeq ($(need-sub-make),1)
 172
 173 PHONY += $(MAKECMDGOALS) sub-make
 174
 175 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 176         @:
 177
 178 # Invoke a second make in the output directory, passing relevant variables
 179 sub-make:
 180         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 181
 182 endif # need-sub-make
 183 endif # sub_make_done
 184
 185 # We process the rest of the Makefile if this is the final invocation of make
 186 ifeq ($(need-sub-make),)
 187
 188 # Do not print "Entering directory ...",
 189 # but we want to display it when entering to the output directory
 190 # so that IDEs/editors are able to understand relative filenames.
 191 MAKEFLAGS += --no-print-directory
 192
 193 # Call a source code checker (by default, "sparse") as part of the
 194 # C compilation.
 195 #
 196 # Use 'make C=1' to enable checking of only re-compiled files.
 197 # Use 'make C=2' to enable checking of *all* source files, regardless
 198 # of whether they are re-compiled or not.
 199 #
 200 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 201 # including where to get the "sparse" utility.
 202
 203 ifeq ("$(origin C)", "command line")
 204   KBUILD_CHECKSRC = $(C)
 205 endif
 206 ifndef KBUILD_CHECKSRC
 207   KBUILD_CHECKSRC = 0
 208 endif
 209
 210 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 211 # directory of external module to build. Setting M= takes precedence.
 212 ifeq ("$(origin M)", "command line")
 213   KBUILD_EXTMOD := $(M)
 214 endif
 215
 216 export KBUILD_CHECKSRC KBUILD_EXTMOD
 217
 218 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 219
 220 ifeq ($(abs_srctree),$(abs_objtree))
 221         # building in the source tree
 222         srctree := .
 223         building_out_of_srctree :=
 224 else
 225         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 226                 # building in a subdirectory of the source tree
 227                 srctree := ..
 228         else
 229                 srctree := $(abs_srctree)
 230         endif
 231         building_out_of_srctree := 1
 232 endif
 233
 234 ifneq ($(KBUILD_ABS_SRCTREE),)
 235 srctree := $(abs_srctree)
 236 endif
 237
 238 objtree         := .
 239 VPATH           := $(srctree)
 240
 241 export building_out_of_srctree srctree objtree VPATH
 242
 243 # To make sure we do not include .config for any of the *config targets
 244 # catch them early, and hand them over to scripts/kconfig/Makefile
 245 # It is allowed to specify more targets when calling make, including
 246 # mixing *config targets and build targets.
 247 # For example 'make oldconfig all'.
 248 # Detect when mixed targets is specified, and make a second invocation
 249 # of make so .config is not included in this case either (for *config).
 250
 251 version_h := include/generated/uapi/linux/version.h
 252 old_version_h := include/linux/version.h
 253
 254 clean-targets := %clean mrproper cleandocs
 255 no-dot-config-targets := $(clean-targets) \
 256                          cscope gtags TAGS tags help% %docs check% coccicheck \
 257                          $(version_h) headers headers_% archheaders archscripts \
 258                          %asm-generic kernelversion %src-pkg dt_binding_check \
 259                          outputmakefile
 260 no-sync-config-targets := $(no-dot-config-targets) install %install \
 261                            kernelrelease
 262 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 263
 264 config-build    :=
 265 mixed-build     :=
 266 need-config     := 1
 267 may-sync-config := 1
 268 single-build    :=
 269
 270 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 271         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 272                 need-config :=
 273         endif
 274 endif
 275
 276 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 277         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 278                 may-sync-config :=
 279         endif
 280 endif
 281
 282 ifneq ($(KBUILD_EXTMOD),)
 283         may-sync-config :=
 284 endif
 285
 286 ifeq ($(KBUILD_EXTMOD),)
 287         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 288                 config-build := 1
 289                 ifneq ($(words $(MAKECMDGOALS)),1)
 290                         mixed-build := 1
 291                 endif
 292         endif
 293 endif
 294
 295 # We cannot build single targets and the others at the same time
 296 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 297         single-build := 1
 298         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 299                 mixed-build := 1
 300         endif
 301 endif
 302
 303 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 304 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 305         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 306                 mixed-build := 1
 307         endif
 308 endif
 309
 310 # install and modules_install need also be processed one by one
 311 ifneq ($(filter install,$(MAKECMDGOALS)),)
 312         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 313                 mixed-build := 1
 314         endif
 315 endif
 316
 317 ifdef mixed-build
 318 # ===========================================================================
 319 # We're called with mixed targets (*config and build targets).
 320 # Handle them one by one.
 321
 322 PHONY += $(MAKECMDGOALS) __build_one_by_one
 323
 324 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 325         @:
 326
 327 __build_one_by_one:
 328         $(Q)set -e; \
 329         for i in $(MAKECMDGOALS); do \
 330                 $(MAKE) -f $(srctree)/Makefile $$i; \
 331         done
 332
 333 else # !mixed-build
 334
 335 include scripts/Kbuild.include
 336
 337 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 338 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 339 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 340 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 341
 342 include scripts/subarch.include
 343
 344 # Cross compiling and selecting different set of gcc/bin-utils
 345 # ---------------------------------------------------------------------------
 346 #
 347 # When performing cross compilation for other architectures ARCH shall be set
 348 # to the target architecture. (See arch/* for the possibilities).
 349 # ARCH can be set during invocation of make:
 350 # make ARCH=ia64
 351 # Another way is to have ARCH set in the environment.
 352 # The default ARCH is the host where make is executed.
 353
 354 # CROSS_COMPILE specify the prefix used for all executables used
 355 # during compilation. Only gcc and related bin-utils executables
 356 # are prefixed with $(CROSS_COMPILE).
 357 # CROSS_COMPILE can be set on the command line
 358 # make CROSS_COMPILE=ia64-linux-
 359 # Alternatively CROSS_COMPILE can be set in the environment.
 360 # Default value for CROSS_COMPILE is not to prefix executables
 361 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 362 ARCH            ?= $(SUBARCH)
 363
 364 # Architecture as present in compile.h
 365 UTS_MACHINE     := $(ARCH)
 366 SRCARCH         := $(ARCH)
 367
 368 # Additional ARCH settings for x86
 369 ifeq ($(ARCH),i386)
 370         SRCARCH := x86
 371 endif
 372 ifeq ($(ARCH),x86_64)
 373         SRCARCH := x86
 374 endif
 375
 376 # Additional ARCH settings for sparc
 377 ifeq ($(ARCH),sparc32)
 378        SRCARCH := sparc
 379 endif
 380 ifeq ($(ARCH),sparc64)
 381        SRCARCH := sparc
 382 endif
 383
 384 # Additional ARCH settings for sh
 385 ifeq ($(ARCH),sh64)
 386        SRCARCH := sh
 387 endif
 388
 389 KCONFIG_CONFIG  ?= .config
 390 export KCONFIG_CONFIG
 391
 392 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
 393 export KBUILD_DEFCONFIG := defconfig
 394
 395 # SHELL used by kbuild
 396 CONFIG_SHELL := sh
 397
 398 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 399 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 400 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 401
 402 ifneq ($(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 # When we're building modules with modversions, we need to consider
 612 # the built-in objects during the descend as well, in order to
 613 # make sure the checksums are up to date before we record them.
 614
 615 ifeq ($(MAKECMDGOALS),modules)
 616   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 617 endif
 618
 619 # If we have "make <whatever> modules", compile modules
 620 # in addition to whatever we do anyway.
 621 # Just "make" or "make all" shall build modules as well
 622
 623 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 624   KBUILD_MODULES := 1
 625 endif
 626
 627 ifeq ($(MAKECMDGOALS),)
 628   KBUILD_MODULES := 1
 629 endif
 630
 631 export KBUILD_MODULES KBUILD_BUILTIN
 632
 633 ifdef need-config
 634 include include/config/auto.conf
 635 endif
 636
 637 ifeq ($(KBUILD_EXTMOD),)
 638 # Objects we will link into vmlinux / subdirs we need to visit
 639 init-y          := init/
 640 drivers-y       := drivers/ sound/
 641 drivers-$(CONFIG_SAMPLES) += samples/
 642 net-y           := net/
 643 libs-y          := lib/
 644 core-y          := usr/
 645 virt-y          := virt/
 646 endif # KBUILD_EXTMOD
 647
 648 # The all: target is the default when no target is given on the
 649 # command line.
 650 # This allow a user to issue only 'make' to build a kernel including modules
 651 # Defaults to vmlinux, but the arch makefile usually adds further targets
 652 all: vmlinux
 653
 654 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 655         $(call cc-option,-fno-tree-loop-im) \
 656         $(call cc-disable-warning,maybe-uninitialized,)
 657 export CFLAGS_GCOV
 658
 659 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 660 ifdef CONFIG_FUNCTION_TRACER
 661   CC_FLAGS_FTRACE := -pg
 662 endif
 663
 664 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 665 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 666 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 667 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 668 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 669 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 670 export RETPOLINE_CFLAGS
 671 export RETPOLINE_VDSO_CFLAGS
 672
 673 include arch/$(SRCARCH)/Makefile
 674
 675 ifdef need-config
 676 ifdef may-sync-config
 677 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 678 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 679 # because some architectures define CROSS_COMPILE there.
 680 include include/config/auto.conf.cmd
 681
 682 $(KCONFIG_CONFIG):
 683         @echo >&2 '***'
 684         @echo >&2 '*** Configuration file "$@" not found!'
 685         @echo >&2 '***'
 686         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 687         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 688         @echo >&2 '***'
 689         @/bin/false
 690
 691 # The actual configuration files used during the build are stored in
 692 # include/generated/ and include/config/. Update them if .config is newer than
 693 # include/config/auto.conf (which mirrors .config).
 694 #
 695 # This exploits the 'multi-target pattern rule' trick.
 696 # The syncconfig should be executed only once to make all the targets.
 697 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 698 %/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
 699         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 700 else # !may-sync-config
 701 # External modules and some install targets need include/generated/autoconf.h
 702 # and include/config/auto.conf but do not care if they are up-to-date.
 703 # Use auto.conf to trigger the test
 704 PHONY += include/config/auto.conf
 705
 706 include/config/auto.conf:
 707         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 708         echo >&2;                                                       \
 709         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 710         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 711         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 712         echo >&2 ;                                                      \
 713         /bin/false)
 714
 715 endif # may-sync-config
 716 endif # need-config
 717
 718 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 719 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 720 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 721 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 722 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 723
 724 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 725 KBUILD_CFLAGS += -O2
 726 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 727 KBUILD_CFLAGS += -O3
 728 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 729 KBUILD_CFLAGS += -Os
 730 endif
 731
 732 # Tell gcc to never replace conditional load with a non-conditional one
 733 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 734 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 735
 736 include scripts/Makefile.kcov
 737 include scripts/Makefile.gcc-plugins
 738
 739 ifdef CONFIG_READABLE_ASM
 740 # Disable optimizations that make assembler listings hard to read.
 741 # reorder blocks reorders the control in the function
 742 # ipa clone creates specialized cloned functions
 743 # partial inlining inlines only parts of functions
 744 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 745                  $(call cc-option,-fno-ipa-cp-clone,) \
 746                  $(call cc-option,-fno-partial-inlining)
 747 endif
 748
 749 ifneq ($(CONFIG_FRAME_WARN),0)
 750 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 751 endif
 752
 753 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 754 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 755 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 756
 757 KBUILD_CFLAGS += $(stackp-flags-y)
 758
 759 ifdef CONFIG_CC_IS_CLANG
 760 KBUILD_CPPFLAGS += -Qunused-arguments
 761 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 762 KBUILD_CFLAGS += -Wno-gnu
 763 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 764 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 765 # See modpost pattern 2
 766 KBUILD_CFLAGS += -mno-global-merge
 767 else
 768
 769 # These warnings generated too much noise in a regular build.
 770 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 771 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 772
 773 # Warn about unmarked fall-throughs in switch statement.
 774 # Disabled for clang while comment to attribute conversion happens and
 775 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 776 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 777 endif
 778
 779 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 780 ifdef CONFIG_FRAME_POINTER
 781 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 782 else
 783 # Some targets (ARM with Thumb2, for example), can't be built with frame
 784 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 785 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 786 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 787 # -fomit-frame-pointer with FUNCTION_TRACER.
 788 ifndef CONFIG_FUNCTION_TRACER
 789 KBUILD_CFLAGS   += -fomit-frame-pointer
 790 endif
 791 endif
 792
 793 # Initialize all stack variables with a pattern, if desired.
 794 ifdef CONFIG_INIT_STACK_ALL
 795 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 796 endif
 797
 798 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 799
 800 ifdef CONFIG_DEBUG_INFO
 801 ifdef CONFIG_DEBUG_INFO_SPLIT
 802 DEBUG_CFLAGS    += -gsplit-dwarf
 803 else
 804 DEBUG_CFLAGS    += -g
 805 endif
 806 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 807 endif
 808 ifdef CONFIG_DEBUG_INFO_DWARF4
 809 DEBUG_CFLAGS    += -gdwarf-4
 810 endif
 811
 812 ifdef CONFIG_DEBUG_INFO_REDUCED
 813 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 814                    $(call cc-option,-fno-var-tracking)
 815 endif
 816
 817 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 818 export DEBUG_CFLAGS
 819
 820 ifdef CONFIG_FUNCTION_TRACER
 821 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 822   # gcc 5 supports generating the mcount tables directly
 823   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 824     CC_FLAGS_FTRACE     += -mrecord-mcount
 825     export CC_USING_RECORD_MCOUNT := 1
 826   endif
 827   ifdef CONFIG_HAVE_NOP_MCOUNT
 828     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 829       CC_FLAGS_FTRACE   += -mnop-mcount
 830       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 831     endif
 832   endif
 833 endif
 834 ifdef CONFIG_HAVE_FENTRY
 835   ifeq ($(call cc-option-yn, -mfentry),y)
 836     CC_FLAGS_FTRACE     += -mfentry
 837     CC_FLAGS_USING      += -DCC_USING_FENTRY
 838   endif
 839 endif
 840 export CC_FLAGS_FTRACE
 841 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 842 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 843 ifdef CONFIG_DYNAMIC_FTRACE
 844         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 845                 BUILD_C_RECORDMCOUNT := y
 846                 export BUILD_C_RECORDMCOUNT
 847         endif
 848 endif
 849 endif
 850
 851 # We trigger additional mismatches with less inlining
 852 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 853 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 854 endif
 855
 856 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 857 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 858 LDFLAGS_vmlinux += --gc-sections
 859 endif
 860
 861 ifdef CONFIG_LIVEPATCH
 862 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 863 endif
 864
 865 # arch Makefile may override CC so keep this after arch Makefile is included
 866 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 867
 868 # warn about C99 declaration after statement
 869 KBUILD_CFLAGS += -Wdeclaration-after-statement
 870
 871 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 872 KBUILD_CFLAGS += -Wvla
 873
 874 # disable pointer signed / unsigned warnings in gcc 4.0
 875 KBUILD_CFLAGS += -Wno-pointer-sign
 876
 877 # disable stringop warnings in gcc 8+
 878 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 879
 880 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 881 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 882 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 883 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 884
 885 # Another good warning that we'll want to enable eventually
 886 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
 887
 888 # Enabled with W=2, disabled by default as noisy
 889 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 890
 891 # disable invalid "can't wrap" optimizations for signed / pointers
 892 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 893
 894 # clang sets -fmerge-all-constants by default as optimization, but this
 895 # is non-conforming behavior for C and in fact breaks the kernel, so we
 896 # need to disable it here generally.
 897 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 898
 899 # for gcc -fno-merge-all-constants disables everything, but it is fine
 900 # to have actual conforming behavior enabled.
 901 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 902
 903 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 904 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 905
 906 # conserve stack if available
 907 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 908
 909 # Prohibit date/time macros, which would make the build non-deterministic
 910 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 911
 912 # enforce correct pointer usage
 913 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 914
 915 # Require designated initializers for all marked structures
 916 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 917
 918 # change __FILE__ to the relative path from the srctree
 919 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 920
 921 # ensure -fcf-protection is disabled when using retpoline as it is
 922 # incompatible with -mindirect-branch=thunk-extern
 923 ifdef CONFIG_RETPOLINE
 924 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 925 endif
 926
 927 include scripts/Makefile.kasan
 928 include scripts/Makefile.extrawarn
 929 include scripts/Makefile.ubsan
 930
 931 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 932 KBUILD_CPPFLAGS += $(KCPPFLAGS)
 933 KBUILD_AFLAGS   += $(KAFLAGS)
 934 KBUILD_CFLAGS   += $(KCFLAGS)
 935
 936 KBUILD_LDFLAGS_MODULE += --build-id
 937 LDFLAGS_vmlinux += --build-id
 938
 939 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 940 LDFLAGS_vmlinux += $(call ld-option, -X,)
 941 endif
 942
 943 ifeq ($(CONFIG_RELR),y)
 944 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
 945 endif
 946
 947 # make the checker run with the right architecture
 948 CHECKFLAGS += --arch=$(ARCH)
 949
 950 # insure the checker run with the right endianness
 951 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 952
 953 # the checker needs the correct machine size
 954 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 955
 956 # Default kernel image to build when no specific target is given.
 957 # KBUILD_IMAGE may be overruled on the command line or
 958 # set in the environment
 959 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 960 # this default value
 961 export KBUILD_IMAGE ?= vmlinux
 962
 963 #
 964 # INSTALL_PATH specifies where to place the updated kernel and system map
 965 # images. Default is /boot, but you can set it to other values
 966 export  INSTALL_PATH ?= /boot
 967
 968 #
 969 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 970 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 971 # an argument if needed. Otherwise it defaults to the kernel install path
 972 #
 973 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 974
 975 #
 976 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 977 # relocations required by build roots.  This is not defined in the
 978 # makefile but the argument can be passed to make if needed.
 979 #
 980
 981 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 982 export MODLIB
 983
 984 #
 985 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 986 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 987 # the default option --strip-debug will be used.  Otherwise,
 988 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 989
 990 ifdef INSTALL_MOD_STRIP
 991 ifeq ($(INSTALL_MOD_STRIP),1)
 992 mod_strip_cmd = $(STRIP) --strip-debug
 993 else
 994 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 995 endif # INSTALL_MOD_STRIP=1
 996 else
 997 mod_strip_cmd = true
 998 endif # INSTALL_MOD_STRIP
 999 export mod_strip_cmd
1000
1001 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1002 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1003 # or CONFIG_MODULE_COMPRESS_XZ.
1004
1005 mod_compress_cmd = true
1006 ifdef CONFIG_MODULE_COMPRESS
1007   ifdef CONFIG_MODULE_COMPRESS_GZIP
1008     mod_compress_cmd = gzip -n -f
1009   endif # CONFIG_MODULE_COMPRESS_GZIP
1010   ifdef CONFIG_MODULE_COMPRESS_XZ
1011     mod_compress_cmd = xz -f
1012   endif # CONFIG_MODULE_COMPRESS_XZ
1013 endif # CONFIG_MODULE_COMPRESS
1014 export mod_compress_cmd
1015
1016 ifdef CONFIG_MODULE_SIG_ALL
1017 $(eval $(call config_filename,MODULE_SIG_KEY))
1018
1019 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1020 else
1021 mod_sign_cmd = true
1022 endif
1023 export mod_sign_cmd
1024
1025 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1026
1027 ifdef CONFIG_STACK_VALIDATION
1028   has_libelf := $(call try-run,\
1029                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1030   ifeq ($(has_libelf),1)
1031     objtool_target := tools/objtool FORCE
1032   else
1033     SKIP_STACK_VALIDATION := 1
1034     export SKIP_STACK_VALIDATION
1035   endif
1036 endif
1037
1038 PHONY += prepare0
1039
1040 export MODORDER := $(extmod-prefix)modules.order
1041 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1042
1043 ifeq ($(KBUILD_EXTMOD),)
1044 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1045
1046 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1047                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1048                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1049
1050 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1051                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1052                         $(drivers-) $(net-) $(libs-) $(virt-))))
1053
1054 build-dirs      := $(vmlinux-dirs)
1055 clean-dirs      := $(vmlinux-alldirs)
1056
1057 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1058 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1059 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1060 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1061 libs-y2         := $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y)))
1062 ifdef CONFIG_MODULES
1063 libs-y1         := $(filter-out %/, $(libs-y))
1064 libs-y2         += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1065 else
1066 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1067 endif
1068 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1069
1070 # Externally visible symbols (used by link-vmlinux.sh)
1071 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1072                               $(drivers-y) $(net-y) $(virt-y)
1073 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1074 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1075 export LDFLAGS_vmlinux
1076 # used by scripts/Makefile.package
1077 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1078
1079 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1080
1081 # Recurse until adjust_autoksyms.sh is satisfied
1082 PHONY += autoksyms_recursive
1083 ifdef CONFIG_TRIM_UNUSED_KSYMS
1084 autoksyms_recursive: descend modules.order
1085         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1086           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1087 endif
1088
1089 # For the kernel to actually contain only the needed exported symbols,
1090 # we have to build modules as well to determine what those symbols are.
1091 # (this can be evaluated only once include/config/auto.conf has been included)
1092 ifdef CONFIG_TRIM_UNUSED_KSYMS
1093   KBUILD_MODULES := 1
1094 endif
1095
1096 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1097
1098 quiet_cmd_autoksyms_h = GEN     $@
1099       cmd_autoksyms_h = mkdir -p $(dir $@); \
1100                         $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1101
1102 $(autoksyms_h):
1103         $(call cmd,autoksyms_h)
1104
1105 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1106
1107 # Final link of vmlinux with optional arch pass after final link
1108 cmd_link-vmlinux =                                                 \
1109         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1110         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1111
1112 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1113         +$(call if_changed,link-vmlinux)
1114
1115 targets := vmlinux
1116
1117 # The actual objects are generated when descending,
1118 # make sure no implicit rule kicks in
1119 $(sort $(vmlinux-deps)): descend ;
1120
1121 filechk_kernel.release = \
1122         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1123
1124 # Store (new) KERNELRELEASE string in include/config/kernel.release
1125 include/config/kernel.release: FORCE
1126         $(call filechk,kernel.release)
1127
1128 # Additional helpers built in scripts/
1129 # Carefully list dependencies so we do not try to build scripts twice
1130 # in parallel
1131 PHONY += scripts
1132 scripts: scripts_basic scripts_dtc
1133         $(Q)$(MAKE) $(build)=$(@)
1134
1135 # Things we need to do before we recursively start building the kernel
1136 # or the modules are listed in "prepare".
1137 # A multi level approach is used. prepareN is processed before prepareN-1.
1138 # archprepare is used in arch Makefiles and when processed asm symlink,
1139 # version.h and scripts_basic is processed / created.
1140
1141 PHONY += prepare archprepare
1142
1143 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1144         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1145
1146 prepare0: archprepare
1147         $(Q)$(MAKE) $(build)=scripts/mod
1148         $(Q)$(MAKE) $(build)=.
1149
1150 # All the preparing..
1151 prepare: prepare0 prepare-objtool
1152
1153 # Support for using generic headers in asm-generic
1154 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1155
1156 PHONY += asm-generic uapi-asm-generic
1157 asm-generic: uapi-asm-generic
1158         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1159         generic=include/asm-generic
1160 uapi-asm-generic:
1161         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1162         generic=include/uapi/asm-generic
1163
1164 PHONY += prepare-objtool
1165 prepare-objtool: $(objtool_target)
1166 ifeq ($(SKIP_STACK_VALIDATION),1)
1167 ifdef CONFIG_UNWINDER_ORC
1168         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1169         @false
1170 else
1171         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1172 endif
1173 endif
1174
1175 # Generate some files
1176 # ---------------------------------------------------------------------------
1177
1178 # KERNELRELEASE can change from a few different places, meaning version.h
1179 # needs to be updated, so this check is forced on all builds
1180
1181 uts_len := 64
1182 define filechk_utsrelease.h
1183         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1184           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1185           exit 1;                                                         \
1186         fi;                                                               \
1187         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1188 endef
1189
1190 define filechk_version.h
1191         echo \#define LINUX_VERSION_CODE $(shell                         \
1192         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1193         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1194 endef
1195
1196 $(version_h): FORCE
1197         $(call filechk,version.h)
1198         $(Q)rm -f $(old_version_h)
1199
1200 include/generated/utsrelease.h: include/config/kernel.release FORCE
1201         $(call filechk,utsrelease.h)
1202
1203 PHONY += headerdep
1204 headerdep:
1205         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1206         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1207
1208 # ---------------------------------------------------------------------------
1209 # Kernel headers
1210
1211 #Default location for installed headers
1212 export INSTALL_HDR_PATH = $(objtree)/usr
1213
1214 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1215       cmd_headers_install = \
1216         mkdir -p $(INSTALL_HDR_PATH); \
1217         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1218         usr/include $(INSTALL_HDR_PATH)
1219
1220 PHONY += headers_install
1221 headers_install: headers
1222         $(call cmd,headers_install)
1223
1224 PHONY += archheaders archscripts
1225
1226 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1227
1228 PHONY += headers
1229 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1230         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1231           $(error Headers not exportable for the $(SRCARCH) architecture))
1232         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1233         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1234
1235 # Deprecated. It is no-op now.
1236 PHONY += headers_check
1237 headers_check:
1238         @:
1239
1240 ifdef CONFIG_HEADERS_INSTALL
1241 prepare: headers
1242 endif
1243
1244 PHONY += scripts_unifdef
1245 scripts_unifdef: scripts_basic
1246         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1247
1248 # ---------------------------------------------------------------------------
1249 # Kernel selftest
1250
1251 PHONY += kselftest
1252 kselftest:
1253         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1254
1255 kselftest-%: FORCE
1256         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1257
1258 PHONY += kselftest-merge
1259 kselftest-merge:
1260         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1261         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1262                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1263         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1264
1265 # ---------------------------------------------------------------------------
1266 # Devicetree files
1267
1268 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1269 dtstree := arch/$(SRCARCH)/boot/dts
1270 endif
1271
1272 ifneq ($(dtstree),)
1273
1274 %.dtb: include/config/kernel.release scripts_dtc
1275         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1276
1277 PHONY += dtbs dtbs_install dtbs_check
1278 dtbs: include/config/kernel.release scripts_dtc
1279         $(Q)$(MAKE) $(build)=$(dtstree)
1280
1281 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1282 export CHECK_DTBS=y
1283 dtbs: dt_binding_check
1284 endif
1285
1286 dtbs_check: dtbs
1287
1288 dtbs_install:
1289         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1290
1291 ifdef CONFIG_OF_EARLY_FLATTREE
1292 all: dtbs
1293 endif
1294
1295 endif
1296
1297 PHONY += scripts_dtc
1298 scripts_dtc: scripts_basic
1299         $(Q)$(MAKE) $(build)=scripts/dtc
1300
1301 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1302 export CHECK_DT_BINDING=y
1303 endif
1304
1305 PHONY += dt_binding_check
1306 dt_binding_check: scripts_dtc
1307         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1308
1309 # ---------------------------------------------------------------------------
1310 # Modules
1311
1312 ifdef CONFIG_MODULES
1313
1314 # By default, build modules as well
1315
1316 all: modules
1317
1318 # Build modules
1319 #
1320 # A module can be listed more than once in obj-m resulting in
1321 # duplicate lines in modules.order files.  Those are removed
1322 # using awk while concatenating to the final file.
1323
1324 PHONY += modules
1325 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1326         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1327         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1328
1329 modules.order: descend
1330         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1331
1332 # Target to prepare building external modules
1333 PHONY += modules_prepare
1334 modules_prepare: prepare
1335
1336 # Target to install modules
1337 PHONY += modules_install
1338 modules_install: _modinst_ _modinst_post
1339
1340 PHONY += _modinst_
1341 _modinst_:
1342         @rm -rf $(MODLIB)/kernel
1343         @rm -f $(MODLIB)/source
1344         @mkdir -p $(MODLIB)/kernel
1345         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1346         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1347                 rm -f $(MODLIB)/build ; \
1348                 ln -s $(CURDIR) $(MODLIB)/build ; \
1349         fi
1350         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1351         @cp -f modules.builtin $(MODLIB)/
1352         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1353         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1354
1355 # This depmod is only for convenience to give the initial
1356 # boot a modules.dep even before / is mounted read-write.  However the
1357 # boot script depmod is the master version.
1358 PHONY += _modinst_post
1359 _modinst_post: _modinst_
1360         $(call cmd,depmod)
1361
1362 ifeq ($(CONFIG_MODULE_SIG), y)
1363 PHONY += modules_sign
1364 modules_sign:
1365         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1366 endif
1367
1368 else # CONFIG_MODULES
1369
1370 # Modules not configured
1371 # ---------------------------------------------------------------------------
1372
1373 PHONY += modules modules_install
1374 modules modules_install:
1375         @echo >&2
1376         @echo >&2 "The present kernel configuration has modules disabled."
1377         @echo >&2 "Type 'make config' and enable loadable module support."
1378         @echo >&2 "Then build a kernel with module support enabled."
1379         @echo >&2
1380         @exit 1
1381
1382 endif # CONFIG_MODULES
1383
1384 ###
1385 # Cleaning is done on three levels.
1386 # make clean     Delete most generated files
1387 #                Leave enough to build external modules
1388 # make mrproper  Delete the current configuration, and all generated files
1389 # make distclean Remove editor backup files, patch leftover files and the like
1390
1391 # Directories & files removed with 'make clean'
1392 CLEAN_DIRS  += include/ksym
1393 CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
1394
1395 # Directories & files removed with 'make mrproper'
1396 MRPROPER_DIRS  += include/config include/generated          \
1397                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1398                   debian/ snap/ tar-install/
1399 MRPROPER_FILES += .config .config.old .version \
1400                   Module.symvers \
1401                   signing_key.pem signing_key.priv signing_key.x509     \
1402                   x509.genkey extra_certificates signing_key.x509.keyid \
1403                   signing_key.x509.signer vmlinux-gdb.py \
1404                   *.spec
1405
1406 # Directories & files removed with 'make distclean'
1407 DISTCLEAN_DIRS  +=
1408 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1409
1410 # clean - Delete most, but leave enough to build external modules
1411 #
1412 clean: rm-dirs  := $(CLEAN_DIRS)
1413 clean: rm-files := $(CLEAN_FILES)
1414
1415 PHONY += archclean vmlinuxclean
1416
1417 vmlinuxclean:
1418         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1419         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1420
1421 clean: archclean vmlinuxclean
1422
1423 # mrproper - Delete all generated files, including .config
1424 #
1425 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1426 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1427 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1428
1429 PHONY += $(mrproper-dirs) mrproper
1430 $(mrproper-dirs):
1431         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1432
1433 mrproper: clean $(mrproper-dirs)
1434         $(call cmd,rmdirs)
1435         $(call cmd,rmfiles)
1436
1437 # distclean
1438 #
1439 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1440 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1441
1442 PHONY += distclean
1443
1444 distclean: mrproper
1445         $(call cmd,rmdirs)
1446         $(call cmd,rmfiles)
1447         @find $(srctree) $(RCS_FIND_IGNORE) \
1448                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1449                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1450                 -o -name 'core' \) \
1451                 -type f -print | xargs rm -f
1452
1453
1454 # Packaging of the kernel to various formats
1455 # ---------------------------------------------------------------------------
1456
1457 %src-pkg: FORCE
1458         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1459 %pkg: include/config/kernel.release FORCE
1460         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1461
1462 # Brief documentation of the typical targets used
1463 # ---------------------------------------------------------------------------
1464
1465 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1466 boards := $(sort $(notdir $(boards)))
1467 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1468 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1469
1470 PHONY += help
1471 help:
1472         @echo  'Cleaning targets:'
1473         @echo  '  clean           - Remove most generated files but keep the config and'
1474         @echo  '                    enough build support to build external modules'
1475         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1476         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1477         @echo  ''
1478         @echo  'Configuration targets:'
1479         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1480         @echo  ''
1481         @echo  'Other generic targets:'
1482         @echo  '  all             - Build all targets marked with [*]'
1483         @echo  '* vmlinux         - Build the bare kernel'
1484         @echo  '* modules         - Build all modules'
1485         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1486         @echo  '  dir/            - Build all files in dir and below'
1487         @echo  '  dir/file.[ois]  - Build specified target only'
1488         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1489         @echo  '                    (requires compiler support for LLVM assembly generation)'
1490         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1491         @echo  '                    (requires a recent binutils and recent build (System.map))'
1492         @echo  '  dir/file.ko     - Build module including final link'
1493         @echo  '  modules_prepare - Set up for building external modules'
1494         @echo  '  tags/TAGS       - Generate tags file for editors'
1495         @echo  '  cscope          - Generate cscope index'
1496         @echo  '  gtags           - Generate GNU GLOBAL index'
1497         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1498         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1499         @echo  '  image_name      - Output the image name (use with make -s)'
1500         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1501          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1502          echo  ''
1503         @echo  'Static analysers:'
1504         @echo  '  checkstack      - Generate a list of stack hogs'
1505         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1506         @echo  '  versioncheck    - Sanity check on version.h usage'
1507         @echo  '  includecheck    - Check for duplicate included header files'
1508         @echo  '  export_report   - List the usages of all exported symbols'
1509         @echo  '  headerdep       - Detect inclusion cycles in headers'
1510         @echo  '  coccicheck      - Check with Coccinelle'
1511         @echo  ''
1512         @echo  'Tools:'
1513         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1514         @echo  ''
1515         @echo  'Kernel selftest:'
1516         @echo  '  kselftest         - Build and run kernel selftest'
1517         @echo  '                      Build, install, and boot kernel before'
1518         @echo  '                      running kselftest on it'
1519         @echo  '                      Run as root for full coverage'
1520         @echo  '  kselftest-all     - Build kernel selftest'
1521         @echo  '  kselftest-install - Build and install kernel selftest'
1522         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1523         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1524         @echo  '                      kselftest to existing .config.'
1525         @echo  ''
1526         @$(if $(dtstree), \
1527                 echo 'Devicetree:'; \
1528                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1529                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1530                 echo '  dt_binding_check - Validate device tree binding documents'; \
1531                 echo '  dtbs_check       - Validate device tree source files';\
1532                 echo '')
1533
1534         @echo 'Userspace tools targets:'
1535         @echo '  use "make tools/help"'
1536         @echo '  or  "cd tools; make help"'
1537         @echo  ''
1538         @echo  'Kernel packaging:'
1539         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1540         @echo  ''
1541         @echo  'Documentation targets:'
1542         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1543         @echo  ''
1544         @echo  'Architecture specific targets ($(SRCARCH)):'
1545         @$(if $(archhelp),$(archhelp),\
1546                 echo '  No architecture specific help defined for $(SRCARCH)')
1547         @echo  ''
1548         @$(if $(boards), \
1549                 $(foreach b, $(boards), \
1550                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1551                 echo '')
1552         @$(if $(board-dirs), \
1553                 $(foreach b, $(board-dirs), \
1554                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1555                 printf "  %-16s - Show all of the above\\n" help-boards; \
1556                 echo '')
1557
1558         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1559         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1560         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1561         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1562         @echo  '                       (sparse by default)'
1563         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1564         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1565         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1566         @echo  '                1: warnings which may be relevant and do not occur too often'
1567         @echo  '                2: warnings which occur quite often but may still be relevant'
1568         @echo  '                3: more obscure warnings, can most likely be ignored'
1569         @echo  '                Multiple levels can be combined with W=12 or W=123'
1570         @echo  ''
1571         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1572         @echo  'For further info see the ./README file'
1573
1574
1575 help-board-dirs := $(addprefix help-,$(board-dirs))
1576
1577 help-boards: $(help-board-dirs)
1578
1579 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1580
1581 $(help-board-dirs): help-%:
1582         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1583         @$(if $(boards-per-dir), \
1584                 $(foreach b, $(boards-per-dir), \
1585                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1586                 echo '')
1587
1588
1589 # Documentation targets
1590 # ---------------------------------------------------------------------------
1591 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1592                linkcheckdocs dochelp refcheckdocs
1593 PHONY += $(DOC_TARGETS)
1594 $(DOC_TARGETS):
1595         $(Q)$(MAKE) $(build)=Documentation $@
1596
1597 # Misc
1598 # ---------------------------------------------------------------------------
1599
1600 PHONY += scripts_gdb
1601 scripts_gdb: prepare0
1602         $(Q)$(MAKE) $(build)=scripts/gdb
1603         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1604
1605 ifdef CONFIG_GDB_SCRIPTS
1606 all: scripts_gdb
1607 endif
1608
1609 else # KBUILD_EXTMOD
1610
1611 ###
1612 # External module support.
1613 # When building external modules the kernel used as basis is considered
1614 # read-only, and no consistency checks are made and the make
1615 # system is not used on the basis kernel. If updates are required
1616 # in the basis kernel ordinary make commands (without M=...) must
1617 # be used.
1618 #
1619 # The following are the only valid targets when building external
1620 # modules.
1621 # make M=dir clean     Delete all automatically generated files
1622 # make M=dir modules   Make all modules in specified dir
1623 # make M=dir           Same as 'make M=dir modules'
1624 # make M=dir modules_install
1625 #                      Install the modules built in the module directory
1626 #                      Assumes install directory is already created
1627
1628 # We are always building modules
1629 KBUILD_MODULES := 1
1630
1631 PHONY += $(objtree)/Module.symvers
1632 $(objtree)/Module.symvers:
1633         @test -e $(objtree)/Module.symvers || ( \
1634         echo; \
1635         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1636         echo "           is missing; modules will have no dependencies and modversions."; \
1637         echo )
1638
1639 build-dirs := $(KBUILD_EXTMOD)
1640 PHONY += modules
1641 modules: descend $(objtree)/Module.symvers
1642         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1643
1644 PHONY += modules_install
1645 modules_install: _emodinst_ _emodinst_post
1646
1647 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1648 PHONY += _emodinst_
1649 _emodinst_:
1650         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1651         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1652
1653 PHONY += _emodinst_post
1654 _emodinst_post: _emodinst_
1655         $(call cmd,depmod)
1656
1657 clean-dirs := $(KBUILD_EXTMOD)
1658 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1659
1660 PHONY += /
1661 /:
1662         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1663
1664 PHONY += help
1665 help:
1666         @echo  '  Building external modules.'
1667         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1668         @echo  ''
1669         @echo  '  modules         - default target, build the module(s)'
1670         @echo  '  modules_install - install the module'
1671         @echo  '  clean           - remove generated files in module directory only'
1672         @echo  ''
1673
1674 PHONY += prepare
1675 endif # KBUILD_EXTMOD
1676
1677 # Single targets
1678 # ---------------------------------------------------------------------------
1679 # To build individual files in subdirectories, you can do like this:
1680 #
1681 #   make foo/bar/baz.s
1682 #
1683 # The supported suffixes for single-target are listed in 'single-targets'
1684 #
1685 # To build only under specific subdirectories, you can do like this:
1686 #
1687 #   make foo/bar/baz/
1688
1689 ifdef single-build
1690
1691 # .ko is special because modpost is needed
1692 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1693 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1694
1695 $(single-ko): single_modpost
1696         @:
1697 $(single-no-ko): descend
1698         @:
1699
1700 ifeq ($(KBUILD_EXTMOD),)
1701 # For the single build of in-tree modules, use a temporary file to avoid
1702 # the situation of modules_install installing an invalid modules.order.
1703 MODORDER := .modules.tmp
1704 endif
1705
1706 PHONY += single_modpost
1707 single_modpost: $(single-no-ko)
1708         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1709         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1710
1711 KBUILD_MODULES := 1
1712
1713 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1714
1715 # trim unrelated directories
1716 build-dirs := $(foreach d, $(build-dirs), \
1717                         $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1718
1719 endif
1720
1721 # Handle descending into subdirectories listed in $(build-dirs)
1722 # Preset locale variables to speed up the build process. Limit locale
1723 # tweaks to this spot to avoid wrong language settings when running
1724 # make menuconfig etc.
1725 # Error messages still appears in the original language
1726 PHONY += descend $(build-dirs)
1727 descend: $(build-dirs)
1728 $(build-dirs): prepare
1729         $(Q)$(MAKE) $(build)=$@ \
1730         single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1731         need-builtin=1 need-modorder=1
1732
1733 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1734 PHONY += $(clean-dirs) clean
1735 $(clean-dirs):
1736         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1737
1738 clean: $(clean-dirs)
1739         $(call cmd,rmdirs)
1740         $(call cmd,rmfiles)
1741         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1742                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1743                 -o -name '*.ko.*' \
1744                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1745                 -o -name '*.dwo' -o -name '*.lst' \
1746                 -o -name '*.su' -o -name '*.mod' \
1747                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1748                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1749                 -o -name '*.asn1.[ch]' \
1750                 -o -name '*.symtypes' -o -name 'modules.order' \
1751                 -o -name '.tmp_*.o.*' \
1752                 -o -name '*.c.[012]*.*' \
1753                 -o -name '*.ll' \
1754                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1755
1756 # Generate tags for editors
1757 # ---------------------------------------------------------------------------
1758 quiet_cmd_tags = GEN     $@
1759       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1760
1761 tags TAGS cscope gtags: FORCE
1762         $(call cmd,tags)
1763
1764 # Script to generate missing namespace dependencies
1765 # ---------------------------------------------------------------------------
1766
1767 PHONY += nsdeps
1768 nsdeps: export KBUILD_NSDEPS=1
1769 nsdeps: modules
1770         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1771
1772 # Scripts to check various things for consistency
1773 # ---------------------------------------------------------------------------
1774
1775 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1776
1777 includecheck:
1778         find $(srctree)/* $(RCS_FIND_IGNORE) \
1779                 -name '*.[hcS]' -type f -print | sort \
1780                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1781
1782 versioncheck:
1783         find $(srctree)/* $(RCS_FIND_IGNORE) \
1784                 -name '*.[hcS]' -type f -print | sort \
1785                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1786
1787 coccicheck:
1788         $(Q)$(BASH) $(srctree)/scripts/$@
1789
1790 namespacecheck:
1791         $(PERL) $(srctree)/scripts/namespace.pl
1792
1793 export_report:
1794         $(PERL) $(srctree)/scripts/export_report.pl
1795
1796 PHONY += checkstack kernelrelease kernelversion image_name
1797
1798 # UML needs a little special treatment here.  It wants to use the host
1799 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1800 # else wants $(ARCH), including people doing cross-builds, which means
1801 # that $(SUBARCH) doesn't work here.
1802 ifeq ($(ARCH), um)
1803 CHECKSTACK_ARCH := $(SUBARCH)
1804 else
1805 CHECKSTACK_ARCH := $(ARCH)
1806 endif
1807 checkstack:
1808         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1809         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1810
1811 kernelrelease:
1812         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1813
1814 kernelversion:
1815         @echo $(KERNELVERSION)
1816
1817 image_name:
1818         @echo $(KBUILD_IMAGE)
1819
1820 # Clear a bunch of variables before executing the submake
1821
1822 ifeq ($(quiet),silent_)
1823 tools_silent=s
1824 endif
1825
1826 tools/: FORCE
1827         $(Q)mkdir -p $(objtree)/tools
1828         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1829
1830 tools/%: FORCE
1831         $(Q)mkdir -p $(objtree)/tools
1832         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1833
1834 # FIXME Should go into a make.lib or something
1835 # ===========================================================================
1836
1837 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1838       cmd_rmdirs = rm -rf $(rm-dirs)
1839
1840 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1841       cmd_rmfiles = rm -f $(rm-files)
1842
1843 # Run depmod only if we have System.map and depmod is executable
1844 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1845       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1846                    $(KERNELRELEASE)
1847
1848 # read saved command lines for existing targets
1849 existing-targets := $(wildcard $(sort $(targets)))
1850
1851 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1852
1853 endif # config-build
1854 endif # mixed-build
1855 endif # need-sub-make
1856
1857 PHONY += FORCE
1858 FORCE:
1859
1860 # Declare the contents of the PHONY variable as phony.  We keep that
1861 # information in a variable so we can use it in if_changed and friends.
1862 .PHONY: $(PHONY)