Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 4
   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 $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # Kbuild will save output files in the current working directory.
 100 # This does not need to match to the root of the kernel source tree.
 101 #
 102 # For example, you can do this:
 103 #
 104 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105 #
 106 # If you want to save output files in a different location, there are
 107 # two syntaxes to specify it.
 108 #
 109 # 1) O=
 110 # Use "make O=dir/to/store/output/files/"
 111 #
 112 # 2) Set KBUILD_OUTPUT
 113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115 #
 116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117 # variable.
 118
 119 # Do we want to change the working directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 ifneq ($(KBUILD_OUTPUT),)
 125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126 # expand a shell special character '~'. We use a somewhat tedious way here.
 127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128 $(if $(abs_objtree),, \
 129      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131 # $(realpath ...) resolves symlinks
 132 abs_objtree := $(realpath $(abs_objtree))
 133 else
 134 abs_objtree := $(CURDIR)
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137 ifeq ($(abs_objtree),$(CURDIR))
 138 # Suppress "Entering directory ..." unless we are changing the work directory.
 139 MAKEFLAGS += --no-print-directory
 140 else
 141 need-sub-make := 1
 142 endif
 143
 144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147 $(error source directory cannot contain spaces or colons)
 148 endif
 149
 150 ifneq ($(abs_srctree),$(abs_objtree))
 151 # Look for make include files relative to root of kernel src
 152 #
 153 # This does not become effective immediately because MAKEFLAGS is re-parsed
 154 # once after the Makefile is read. We need to invoke sub-make.
 155 MAKEFLAGS += --include-dir=$(abs_srctree)
 156 need-sub-make := 1
 157 endif
 158
 159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162 need-sub-make := 1
 163 # Cancel implicit rules for this Makefile.
 164 $(lastword $(MAKEFILE_LIST)): ;
 165 endif
 166
 167 export abs_srctree abs_objtree
 168 export sub_make_done := 1
 169
 170 ifeq ($(need-sub-make),1)
 171
 172 PHONY += $(MAKECMDGOALS) sub-make
 173
 174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175         @:
 176
 177 # Invoke a second make in the output directory, passing relevant variables
 178 sub-make:
 179         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181 endif # need-sub-make
 182 endif # sub_make_done
 183
 184 # We process the rest of the Makefile if this is the final invocation of make
 185 ifeq ($(need-sub-make),)
 186
 187 # Do not print "Entering directory ...",
 188 # but we want to display it when entering to the output directory
 189 # so that IDEs/editors are able to understand relative filenames.
 190 MAKEFLAGS += --no-print-directory
 191
 192 # Call a source code checker (by default, "sparse") as part of the
 193 # C compilation.
 194 #
 195 # Use 'make C=1' to enable checking of only re-compiled files.
 196 # Use 'make C=2' to enable checking of *all* source files, regardless
 197 # of whether they are re-compiled or not.
 198 #
 199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 200 # including where to get the "sparse" utility.
 201
 202 ifeq ("$(origin C)", "command line")
 203   KBUILD_CHECKSRC = $(C)
 204 endif
 205 ifndef KBUILD_CHECKSRC
 206   KBUILD_CHECKSRC = 0
 207 endif
 208
 209 # Call message checker as part of the C compilation
 210 #
 211 # Use 'make D=1' to enable checking
 212 # Use 'make D=2' to create the message catalog
 213
 214 ifdef D
 215   ifeq ("$(origin D)", "command line")
 216     KBUILD_KMSG_CHECK = $(D)
 217   endif
 218 endif
 219 ifndef KBUILD_KMSG_CHECK
 220   KBUILD_KMSG_CHECK = 0
 221 endif
 222
 223 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 224 # directory of external module to build. Setting M= takes precedence.
 225 ifeq ("$(origin M)", "command line")
 226   KBUILD_EXTMOD := $(M)
 227 endif
 228
 229 export KBUILD_CHECKSRC KBUILD_EXTMOD
 230
 231 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 232
 233 ifeq ($(abs_srctree),$(abs_objtree))
 234         # building in the source tree
 235         srctree := .
 236         building_out_of_srctree :=
 237 else
 238         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 239                 # building in a subdirectory of the source tree
 240                 srctree := ..
 241         else
 242                 srctree := $(abs_srctree)
 243         endif
 244         building_out_of_srctree := 1
 245 endif
 246
 247 ifneq ($(KBUILD_ABS_SRCTREE),)
 248 srctree := $(abs_srctree)
 249 endif
 250
 251 objtree         := .
 252 VPATH           := $(srctree)
 253
 254 export building_out_of_srctree srctree objtree VPATH
 255
 256 # To make sure we do not include .config for any of the *config targets
 257 # catch them early, and hand them over to scripts/kconfig/Makefile
 258 # It is allowed to specify more targets when calling make, including
 259 # mixing *config targets and build targets.
 260 # For example 'make oldconfig all'.
 261 # Detect when mixed targets is specified, and make a second invocation
 262 # of make so .config is not included in this case either (for *config).
 263
 264 version_h := include/generated/uapi/linux/version.h
 265 old_version_h := include/linux/version.h
 266
 267 clean-targets := %clean mrproper cleandocs
 268 no-dot-config-targets := $(clean-targets) \
 269                          cscope gtags TAGS tags help% %docs check% coccicheck \
 270                          $(version_h) headers headers_% archheaders archscripts \
 271                          %asm-generic kernelversion %src-pkg
 272 no-sync-config-targets := $(no-dot-config-targets) install %install \
 273                            kernelrelease
 274 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 275
 276 config-build    :=
 277 mixed-build     :=
 278 need-config     := 1
 279 may-sync-config := 1
 280 single-build    :=
 281
 282 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 283         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 284                 need-config :=
 285         endif
 286 endif
 287
 288 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 289         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 290                 may-sync-config :=
 291         endif
 292 endif
 293
 294 ifneq ($(KBUILD_EXTMOD),)
 295         may-sync-config :=
 296 endif
 297
 298 ifeq ($(KBUILD_EXTMOD),)
 299         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 300                 config-build := 1
 301                 ifneq ($(words $(MAKECMDGOALS)),1)
 302                         mixed-build := 1
 303                 endif
 304         endif
 305 endif
 306
 307 # We cannot build single targets and the others at the same time
 308 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 309         single-build := 1
 310         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 311                 mixed-build := 1
 312         endif
 313 endif
 314
 315 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 316 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 317         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 318                 mixed-build := 1
 319         endif
 320 endif
 321
 322 # install and modules_install need also be processed one by one
 323 ifneq ($(filter install,$(MAKECMDGOALS)),)
 324         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 325                 mixed-build := 1
 326         endif
 327 endif
 328
 329 ifdef mixed-build
 330 # ===========================================================================
 331 # We're called with mixed targets (*config and build targets).
 332 # Handle them one by one.
 333
 334 PHONY += $(MAKECMDGOALS) __build_one_by_one
 335
 336 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 337         @:
 338
 339 __build_one_by_one:
 340         $(Q)set -e; \
 341         for i in $(MAKECMDGOALS); do \
 342                 $(MAKE) -f $(srctree)/Makefile $$i; \
 343         done
 344
 345 else # !mixed-build
 346
 347 include scripts/Kbuild.include
 348
 349 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 350 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 351 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 352 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 353
 354 include scripts/subarch.include
 355
 356 # Cross compiling and selecting different set of gcc/bin-utils
 357 # ---------------------------------------------------------------------------
 358 #
 359 # When performing cross compilation for other architectures ARCH shall be set
 360 # to the target architecture. (See arch/* for the possibilities).
 361 # ARCH can be set during invocation of make:
 362 # make ARCH=ia64
 363 # Another way is to have ARCH set in the environment.
 364 # The default ARCH is the host where make is executed.
 365
 366 # CROSS_COMPILE specify the prefix used for all executables used
 367 # during compilation. Only gcc and related bin-utils executables
 368 # are prefixed with $(CROSS_COMPILE).
 369 # CROSS_COMPILE can be set on the command line
 370 # make CROSS_COMPILE=ia64-linux-
 371 # Alternatively CROSS_COMPILE can be set in the environment.
 372 # Default value for CROSS_COMPILE is not to prefix executables
 373 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 374 ARCH            ?= $(SUBARCH)
 375
 376 # Architecture as present in compile.h
 377 UTS_MACHINE     := $(ARCH)
 378 SRCARCH         := $(ARCH)
 379
 380 # Additional ARCH settings for x86
 381 ifeq ($(ARCH),i386)
 382         SRCARCH := x86
 383 endif
 384 ifeq ($(ARCH),x86_64)
 385         SRCARCH := x86
 386 endif
 387
 388 # Additional ARCH settings for sparc
 389 ifeq ($(ARCH),sparc32)
 390        SRCARCH := sparc
 391 endif
 392 ifeq ($(ARCH),sparc64)
 393        SRCARCH := sparc
 394 endif
 395
 396 # Additional ARCH settings for sh
 397 ifeq ($(ARCH),sh64)
 398        SRCARCH := sh
 399 endif
 400
 401 KCONFIG_CONFIG  ?= .config
 402 export KCONFIG_CONFIG
 403
 404 # SHELL used by kbuild
 405 CONFIG_SHELL := sh
 406
 407 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 408 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 409 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 410
 411 HOSTCC       = gcc
 412 HOSTCXX      = g++
 413 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 414                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 415                 $(HOSTCFLAGS)
 416 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 417 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 418 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 419
 420 # Make variables (CC, etc...)
 421 AS              = $(CROSS_COMPILE)as
 422 LD              = $(CROSS_COMPILE)ld
 423 CC              = $(CROSS_COMPILE)gcc
 424 CPP             = $(CC) -E
 425 AR              = $(CROSS_COMPILE)ar
 426 NM              = $(CROSS_COMPILE)nm
 427 STRIP           = $(CROSS_COMPILE)strip
 428 OBJCOPY         = $(CROSS_COMPILE)objcopy
 429 OBJDUMP         = $(CROSS_COMPILE)objdump
 430 OBJSIZE         = $(CROSS_COMPILE)size
 431 PAHOLE          = pahole
 432 LEX             = flex
 433 YACC            = bison
 434 AWK             = awk
 435 INSTALLKERNEL  := installkernel
 436 DEPMOD          = /sbin/depmod
 437 PERL            = perl
 438 PYTHON          = python
 439 PYTHON2         = python2
 440 PYTHON3         = python3
 441 CHECK           = sparse
 442 BASH            = bash
 443
 444 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 445                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 446 KMSG_CHECK      = $(srctree)/scripts/kmsg-doc
 447 NOSTDINC_FLAGS :=
 448 CFLAGS_MODULE   =
 449 AFLAGS_MODULE   =
 450 LDFLAGS_MODULE  =
 451 CFLAGS_KERNEL   =
 452 AFLAGS_KERNEL   =
 453 LDFLAGS_vmlinux =
 454
 455 # Prefer linux-backports-modules
 456 ifneq ($(KBUILD_SRC),)
 457 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
 458 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
 459 endif
 460 endif
 461
 462 # Use USERINCLUDE when you must reference the UAPI directories only.
 463 USERINCLUDE    := \
 464                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 465                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 466                 -I$(srctree)/include/uapi \
 467                 -I$(objtree)/include/generated/uapi \
 468                 -include $(srctree)/include/linux/kconfig.h
 469
 470 # Use LINUXINCLUDE when you must reference the include/ directory.
 471 # Needed to be compatible with the O= option
 472 LINUXINCLUDE    := \
 473                 $(UBUNTUINCLUDE) \
 474                 -I$(srctree)/arch/$(SRCARCH)/include \
 475                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 476                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 477                 -I$(objtree)/include \
 478                 $(USERINCLUDE)
 479
 480 # UBUNTU: Include our third party driver stuff too
 481 LINUXINCLUDE   += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
 482
 483 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 484 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 485                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 486                    -Werror=implicit-function-declaration -Werror=implicit-int \
 487                    -Wno-format-security \
 488                    -std=gnu89
 489 KBUILD_CPPFLAGS := -D__KERNEL__
 490 KBUILD_AFLAGS_KERNEL :=
 491 KBUILD_CFLAGS_KERNEL :=
 492 KBUILD_AFLAGS_MODULE  := -DMODULE
 493 KBUILD_CFLAGS_MODULE  := -DMODULE
 494 KBUILD_LDFLAGS_MODULE :=
 495 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 496 KBUILD_LDFLAGS :=
 497 GCC_PLUGINS_CFLAGS :=
 498 CLANG_FLAGS :=
 499
 500 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 501 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 502 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 503 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 504
 505 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 506 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 507 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 508 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 509 export KBUILD_KMSG_CHECK KMSG_CHECK
 510 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 511 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 512
 513 # Files to ignore in find ... statements
 514
 515 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 516                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 517                           -prune -o
 518 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 519                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 520
 521 # ===========================================================================
 522 # Rules shared between *config targets and build targets
 523
 524 # Basic helpers built in scripts/basic/
 525 PHONY += scripts_basic
 526 scripts_basic:
 527         $(Q)$(MAKE) $(build)=scripts/basic
 528         $(Q)rm -f .tmp_quiet_recordmcount
 529
 530 PHONY += outputmakefile
 531 # Before starting out-of-tree build, make sure the source tree is clean.
 532 # outputmakefile generates a Makefile in the output directory, if using a
 533 # separate output directory. This allows convenient use of make in the
 534 # output directory.
 535 # At the same time when output Makefile generated, generate .gitignore to
 536 # ignore whole output directory
 537 outputmakefile:
 538 ifdef building_out_of_srctree
 539         $(Q)if [ -f $(srctree)/.config -o \
 540                  -d $(srctree)/include/config -o \
 541                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 542                 echo >&2 "***"; \
 543                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 544                 echo >&2 "*** in $(abs_srctree)";\
 545                 echo >&2 "***"; \
 546                 false; \
 547         fi
 548         $(Q)ln -fsn $(srctree) source
 549         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 550         $(Q)test -e .gitignore || \
 551         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 552 endif
 553
 554 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 555 ifneq ($(CROSS_COMPILE),)
 556 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 557 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 558 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 559 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 560 endif
 561 ifneq ($(GCC_TOOLCHAIN),)
 562 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 563 endif
 564 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 565 CLANG_FLAGS     += -no-integrated-as
 566 endif
 567 CLANG_FLAGS     += -Werror=unknown-warning-option
 568 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 569 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 570 export CLANG_FLAGS
 571 endif
 572
 573 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 574 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 575 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 576 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 577 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 578
 579 ifdef config-build
 580 # ===========================================================================
 581 # *config targets only - make sure prerequisites are updated, and descend
 582 # in scripts/kconfig to make the *config target
 583
 584 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 585 # KBUILD_DEFCONFIG may point out an alternative default configuration
 586 # used for 'make defconfig'
 587 include arch/$(SRCARCH)/Makefile
 588 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 589
 590 config: outputmakefile scripts_basic FORCE
 591         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 592
 593 %config: outputmakefile scripts_basic FORCE
 594         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 595
 596 else #!config-build
 597 # ===========================================================================
 598 # Build targets only - this includes vmlinux, arch specific targets, clean
 599 # targets and others. In general all targets except *config targets.
 600
 601 # If building an external module we do not care about the all: rule
 602 # but instead _all depend on modules
 603 PHONY += all
 604 ifeq ($(KBUILD_EXTMOD),)
 605 _all: all
 606 else
 607 _all: modules
 608 endif
 609
 610 # Decide whether to build built-in, modular, or both.
 611 # Normally, just do built-in.
 612
 613 KBUILD_MODULES :=
 614 KBUILD_BUILTIN := 1
 615
 616 # If we have only "make modules", don't compile built-in objects.
 617 # When we're building modules with modversions, we need to consider
 618 # the built-in objects during the descend as well, in order to
 619 # make sure the checksums are up to date before we record them.
 620
 621 ifeq ($(MAKECMDGOALS),modules)
 622   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 623 endif
 624
 625 # If we have "make <whatever> modules", compile modules
 626 # in addition to whatever we do anyway.
 627 # Just "make" or "make all" shall build modules as well
 628
 629 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 630   KBUILD_MODULES := 1
 631 endif
 632
 633 ifeq ($(MAKECMDGOALS),)
 634   KBUILD_MODULES := 1
 635 endif
 636
 637 export KBUILD_MODULES KBUILD_BUILTIN
 638
 639 ifdef need-config
 640 include include/config/auto.conf
 641 endif
 642
 643 ifeq ($(KBUILD_EXTMOD),)
 644 # Objects we will link into vmlinux / subdirs we need to visit
 645 init-y          := init/
 646 drivers-y       := drivers/ sound/ ubuntu/
 647 drivers-$(CONFIG_SAMPLES) += samples/
 648 drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
 649 net-y           := net/
 650 libs-y          := lib/
 651 core-y          := usr/
 652 virt-y          := virt/
 653 endif # KBUILD_EXTMOD
 654
 655 # The all: target is the default when no target is given on the
 656 # command line.
 657 # This allow a user to issue only 'make' to build a kernel including modules
 658 # Defaults to vmlinux, but the arch makefile usually adds further targets
 659 all: vmlinux
 660
 661 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 662         $(call cc-option,-fno-tree-loop-im) \
 663         $(call cc-disable-warning,maybe-uninitialized,)
 664 export CFLAGS_GCOV
 665
 666 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 667 ifdef CONFIG_FUNCTION_TRACER
 668   CC_FLAGS_FTRACE := -pg
 669 endif
 670
 671 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 672 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 673 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 674 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 675 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 676 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 677 export RETPOLINE_CFLAGS
 678 export RETPOLINE_VDSO_CFLAGS
 679
 680 include arch/$(SRCARCH)/Makefile
 681
 682 ifdef need-config
 683 ifdef may-sync-config
 684 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 685 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 686 # because some architectures define CROSS_COMPILE there.
 687 include include/config/auto.conf.cmd
 688
 689 $(KCONFIG_CONFIG):
 690         @echo >&2 '***'
 691         @echo >&2 '*** Configuration file "$@" not found!'
 692         @echo >&2 '***'
 693         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 694         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 695         @echo >&2 '***'
 696         @/bin/false
 697
 698 # The actual configuration files used during the build are stored in
 699 # include/generated/ and include/config/. Update them if .config is newer than
 700 # include/config/auto.conf (which mirrors .config).
 701 #
 702 # This exploits the 'multi-target pattern rule' trick.
 703 # The syncconfig should be executed only once to make all the targets.
 704 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 705         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 706 else # !may-sync-config
 707 # External modules and some install targets need include/generated/autoconf.h
 708 # and include/config/auto.conf but do not care if they are up-to-date.
 709 # Use auto.conf to trigger the test
 710 PHONY += include/config/auto.conf
 711
 712 include/config/auto.conf:
 713         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 714         echo >&2;                                                       \
 715         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 716         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 717         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 718         echo >&2 ;                                                      \
 719         /bin/false)
 720
 721 endif # may-sync-config
 722 endif # need-config
 723
 724 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 725 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 726 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 727 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 728 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 729
 730 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 731 KBUILD_CFLAGS += -O2
 732 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 733 KBUILD_CFLAGS += -O3
 734 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 735 KBUILD_CFLAGS += -Os
 736 endif
 737
 738 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 739 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 740 endif
 741
 742 # Tell gcc to never replace conditional load with a non-conditional one
 743 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 744
 745 include scripts/Makefile.kcov
 746 include scripts/Makefile.gcc-plugins
 747
 748 ifdef CONFIG_READABLE_ASM
 749 # Disable optimizations that make assembler listings hard to read.
 750 # reorder blocks reorders the control in the function
 751 # ipa clone creates specialized cloned functions
 752 # partial inlining inlines only parts of functions
 753 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 754                  $(call cc-option,-fno-ipa-cp-clone,) \
 755                  $(call cc-option,-fno-partial-inlining)
 756 endif
 757
 758 ifneq ($(CONFIG_FRAME_WARN),0)
 759 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 760 endif
 761
 762 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 763 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 764 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 765
 766 KBUILD_CFLAGS += $(stackp-flags-y)
 767
 768 ifdef CONFIG_CC_IS_CLANG
 769 KBUILD_CPPFLAGS += -Qunused-arguments
 770 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 771 KBUILD_CFLAGS += -Wno-gnu
 772 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 773 KBUILD_CFLAGS += -Wno-tautological-compare
 774 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 775 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 776 # See modpost pattern 2
 777 KBUILD_CFLAGS += -mno-global-merge
 778 else
 779
 780 # These warnings generated too much noise in a regular build.
 781 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 782 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 783
 784 # Warn about unmarked fall-throughs in switch statement.
 785 # Disabled for clang while comment to attribute conversion happens and
 786 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 787 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 788 endif
 789
 790 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 791 ifdef CONFIG_FRAME_POINTER
 792 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 793 else
 794 # Some targets (ARM with Thumb2, for example), can't be built with frame
 795 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 796 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 797 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 798 # -fomit-frame-pointer with FUNCTION_TRACER.
 799 ifndef CONFIG_FUNCTION_TRACER
 800 KBUILD_CFLAGS   += -fomit-frame-pointer
 801 endif
 802 endif
 803
 804 # Initialize all stack variables with a pattern, if desired.
 805 ifdef CONFIG_INIT_STACK_ALL
 806 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 807 endif
 808
 809 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 810
 811 ifdef CONFIG_DEBUG_INFO
 812 ifdef CONFIG_DEBUG_INFO_SPLIT
 813 DEBUG_CFLAGS    += -gsplit-dwarf
 814 else
 815 DEBUG_CFLAGS    += -g
 816 endif
 817 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 818 endif
 819 ifdef CONFIG_DEBUG_INFO_DWARF4
 820 DEBUG_CFLAGS    += -gdwarf-4
 821 endif
 822
 823 ifdef CONFIG_DEBUG_INFO_REDUCED
 824 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 825                    $(call cc-option,-fno-var-tracking)
 826 endif
 827
 828 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 829 export DEBUG_CFLAGS
 830
 831 ifdef CONFIG_FUNCTION_TRACER
 832 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 833   # gcc 5 supports generating the mcount tables directly
 834   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 835     CC_FLAGS_FTRACE     += -mrecord-mcount
 836     export CC_USING_RECORD_MCOUNT := 1
 837   endif
 838   ifdef CONFIG_HAVE_NOP_MCOUNT
 839     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 840       CC_FLAGS_FTRACE   += -mnop-mcount
 841       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 842     endif
 843   endif
 844 endif
 845 ifdef CONFIG_HAVE_FENTRY
 846   ifeq ($(call cc-option-yn, -mfentry),y)
 847     CC_FLAGS_FTRACE     += -mfentry
 848     CC_FLAGS_USING      += -DCC_USING_FENTRY
 849   endif
 850 endif
 851 export CC_FLAGS_FTRACE
 852 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 853 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 854 ifdef CONFIG_DYNAMIC_FTRACE
 855         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 856                 BUILD_C_RECORDMCOUNT := y
 857                 export BUILD_C_RECORDMCOUNT
 858         endif
 859 endif
 860 endif
 861
 862 # We trigger additional mismatches with less inlining
 863 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 864 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 865 endif
 866
 867 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 868 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 869 LDFLAGS_vmlinux += --gc-sections
 870 endif
 871
 872 ifdef CONFIG_LIVEPATCH
 873 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 874 endif
 875
 876 # arch Makefile may override CC so keep this after arch Makefile is included
 877 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 878
 879 # warn about C99 declaration after statement
 880 KBUILD_CFLAGS += -Wdeclaration-after-statement
 881
 882 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 883 KBUILD_CFLAGS += -Wvla
 884
 885 # disable pointer signed / unsigned warnings in gcc 4.0
 886 KBUILD_CFLAGS += -Wno-pointer-sign
 887
 888 # disable stringop warnings in gcc 8+
 889 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 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 := $(extmod-prefix)modules.order
1041
1042 ifeq ($(KBUILD_EXTMOD),)
1043 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1044
1045 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1046                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1047                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1048
1049 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1050                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1051                         $(drivers-) $(net-) $(libs-) $(virt-))))
1052
1053 build-dirs      := $(vmlinux-dirs)
1054 clean-dirs      := $(vmlinux-alldirs)
1055
1056 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1057 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1058 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1059 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1060 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1061 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1062 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1063
1064 # Externally visible symbols (used by link-vmlinux.sh)
1065 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1066                               $(drivers-y) $(net-y) $(virt-y)
1067 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1068 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1069 export LDFLAGS_vmlinux
1070 # used by scripts/Makefile.package
1071 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1072
1073 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1074
1075 # Recurse until adjust_autoksyms.sh is satisfied
1076 PHONY += autoksyms_recursive
1077 ifdef CONFIG_TRIM_UNUSED_KSYMS
1078 autoksyms_recursive: descend modules.order
1079         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1080           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1081 endif
1082
1083 # For the kernel to actually contain only the needed exported symbols,
1084 # we have to build modules as well to determine what those symbols are.
1085 # (this can be evaluated only once include/config/auto.conf has been included)
1086 ifdef CONFIG_TRIM_UNUSED_KSYMS
1087   KBUILD_MODULES := 1
1088 endif
1089
1090 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1091
1092 $(autoksyms_h):
1093         $(Q)mkdir -p $(dir $@)
1094         $(Q)touch $@
1095
1096 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1097
1098 # Final link of vmlinux with optional arch pass after final link
1099 cmd_link-vmlinux =                                                 \
1100         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1101         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1102
1103 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1104         +$(call if_changed,link-vmlinux)
1105
1106 targets := vmlinux
1107
1108 # The actual objects are generated when descending,
1109 # make sure no implicit rule kicks in
1110 $(sort $(vmlinux-deps)): descend ;
1111
1112 filechk_kernel.release = \
1113         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1114
1115 # Store (new) KERNELRELEASE string in include/config/kernel.release
1116 include/config/kernel.release: FORCE
1117         $(call filechk,kernel.release)
1118
1119 # Additional helpers built in scripts/
1120 # Carefully list dependencies so we do not try to build scripts twice
1121 # in parallel
1122 PHONY += scripts
1123 scripts: scripts_basic scripts_dtc
1124         $(Q)$(MAKE) $(build)=$(@)
1125
1126 # Things we need to do before we recursively start building the kernel
1127 # or the modules are listed in "prepare".
1128 # A multi level approach is used. prepareN is processed before prepareN-1.
1129 # archprepare is used in arch Makefiles and when processed asm symlink,
1130 # version.h and scripts_basic is processed / created.
1131
1132 PHONY += prepare archprepare
1133
1134 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1135         asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1136
1137 prepare0: archprepare
1138         $(Q)$(MAKE) $(build)=scripts/mod
1139         $(Q)$(MAKE) $(build)=.
1140
1141 # All the preparing..
1142 prepare: prepare0 prepare-objtool
1143
1144 # Support for using generic headers in asm-generic
1145 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1146
1147 PHONY += asm-generic uapi-asm-generic
1148 asm-generic: uapi-asm-generic
1149         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1150         generic=include/asm-generic
1151 uapi-asm-generic:
1152         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1153         generic=include/uapi/asm-generic
1154
1155 PHONY += prepare-objtool
1156 prepare-objtool: $(objtool_target)
1157 ifeq ($(SKIP_STACK_VALIDATION),1)
1158 ifdef CONFIG_UNWINDER_ORC
1159         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1160         @false
1161 else
1162         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1163 endif
1164 endif
1165
1166 # Generate some files
1167 # ---------------------------------------------------------------------------
1168
1169 # KERNELRELEASE can change from a few different places, meaning version.h
1170 # needs to be updated, so this check is forced on all builds
1171
1172 uts_len := 64
1173 define filechk_utsrelease.h
1174         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1175           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1176           exit 1;                                                         \
1177         fi;                                                               \
1178         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1179 endef
1180
1181 define filechk_version.h
1182         echo \#define LINUX_VERSION_CODE $(shell                         \
1183         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1184         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1185 endef
1186
1187 $(version_h): FORCE
1188         $(call filechk,version.h)
1189         $(Q)rm -f $(old_version_h)
1190
1191 include/generated/utsrelease.h: include/config/kernel.release FORCE
1192         $(call filechk,utsrelease.h)
1193
1194 PHONY += headerdep
1195 headerdep:
1196         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1197         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1198
1199 # ---------------------------------------------------------------------------
1200 # Kernel headers
1201
1202 #Default location for installed headers
1203 export INSTALL_HDR_PATH = $(objtree)/usr
1204
1205 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1206       cmd_headers_install = \
1207         mkdir -p $(INSTALL_HDR_PATH); \
1208         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1209         usr/include $(INSTALL_HDR_PATH)
1210
1211 PHONY += headers_install
1212 headers_install: headers
1213         $(call cmd,headers_install)
1214
1215 PHONY += archheaders archscripts
1216
1217 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1218
1219 PHONY += headers
1220 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1221         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1222           $(error Headers not exportable for the $(SRCARCH) architecture))
1223         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1224         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1225         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1226
1227 PHONY += headers_check
1228 headers_check: headers
1229         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1230         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1231         $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1232
1233 ifdef CONFIG_HEADERS_INSTALL
1234 prepare: headers
1235 endif
1236
1237 ifdef CONFIG_HEADERS_CHECK
1238 all: headers_check
1239 endif
1240
1241 PHONY += scripts_unifdef
1242 scripts_unifdef: scripts_basic
1243         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1244
1245 # ---------------------------------------------------------------------------
1246 # Kernel selftest
1247
1248 PHONY += kselftest
1249 kselftest:
1250         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1251
1252 kselftest-%: FORCE
1253         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1254
1255 PHONY += kselftest-merge
1256 kselftest-merge:
1257         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1258         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1259                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1260         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1261
1262 # ---------------------------------------------------------------------------
1263 # Devicetree files
1264
1265 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1266 dtstree := arch/$(SRCARCH)/boot/dts
1267 endif
1268
1269 ifneq ($(dtstree),)
1270
1271 %.dtb: include/config/kernel.release scripts_dtc
1272         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1273
1274 PHONY += dtbs dtbs_install dt_binding_check
1275 dtbs dtbs_check: include/config/kernel.release scripts_dtc
1276         $(Q)$(MAKE) $(build)=$(dtstree)
1277
1278 dtbs_check: export CHECK_DTBS=1
1279 dtbs_check: dt_binding_check
1280
1281 dtbs_install:
1282         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1283
1284 ifdef CONFIG_OF_EARLY_FLATTREE
1285 all: dtbs
1286 endif
1287
1288 endif
1289
1290 PHONY += scripts_dtc
1291 scripts_dtc: scripts_basic
1292         $(Q)$(MAKE) $(build)=scripts/dtc
1293
1294 dt_binding_check: scripts_dtc
1295         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1296
1297 # ---------------------------------------------------------------------------
1298 # Modules
1299
1300 ifdef CONFIG_MODULES
1301
1302 # By default, build modules as well
1303
1304 all: modules
1305
1306 # Build modules
1307 #
1308 # A module can be listed more than once in obj-m resulting in
1309 # duplicate lines in modules.order files.  Those are removed
1310 # using awk while concatenating to the final file.
1311
1312 PHONY += modules
1313 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1314         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1315         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1316
1317 modules.order: descend
1318         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1319
1320 modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1321
1322 modules.builtin: $(modbuiltin-dirs)
1323         $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1324
1325 PHONY += $(modbuiltin-dirs)
1326 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1327 # here to make it self-healing in case somebody accidentally removes it.
1328 $(modbuiltin-dirs): include/config/tristate.conf
1329         $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1330
1331 # Target to prepare building external modules
1332 PHONY += modules_prepare
1333 modules_prepare: prepare
1334
1335 # Target to install modules
1336 PHONY += modules_install
1337 modules_install: _modinst_ _modinst_post
1338
1339 PHONY += _modinst_
1340 _modinst_:
1341         @rm -rf $(MODLIB)/kernel
1342         @rm -f $(MODLIB)/source
1343         @mkdir -p $(MODLIB)/kernel
1344         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1345         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1346                 rm -f $(MODLIB)/build ; \
1347                 ln -s $(CURDIR) $(MODLIB)/build ; \
1348         fi
1349         @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1350         @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1351         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1352         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1353
1354 # This depmod is only for convenience to give the initial
1355 # boot a modules.dep even before / is mounted read-write.  However the
1356 # boot script depmod is the master version.
1357 PHONY += _modinst_post
1358 _modinst_post: _modinst_
1359         $(call cmd,depmod)
1360
1361 ifeq ($(CONFIG_MODULE_SIG), y)
1362 PHONY += modules_sign
1363 modules_sign:
1364         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1365 endif
1366
1367 else # CONFIG_MODULES
1368
1369 # Modules not configured
1370 # ---------------------------------------------------------------------------
1371
1372 PHONY += modules modules_install
1373 modules modules_install:
1374         @echo >&2
1375         @echo >&2 "The present kernel configuration has modules disabled."
1376         @echo >&2 "Type 'make config' and enable loadable module support."
1377         @echo >&2 "Then build a kernel with module support enabled."
1378         @echo >&2
1379         @exit 1
1380
1381 endif # CONFIG_MODULES
1382
1383 ###
1384 # Cleaning is done on three levels.
1385 # make clean     Delete most generated files
1386 #                Leave enough to build external modules
1387 # make mrproper  Delete the current configuration, and all generated files
1388 # make distclean Remove editor backup files, patch leftover files and the like
1389
1390 # Directories & files removed with 'make clean'
1391 CLEAN_DIRS  += include/ksym
1392 CLEAN_FILES += modules.builtin.modinfo
1393
1394 # Directories & files removed with 'make mrproper'
1395 MRPROPER_DIRS  += include/config include/generated          \
1396                   arch/$(SRCARCH)/include/generated .tmp_objdiff \
1397                   debian/ snap/ tar-install/
1398 MRPROPER_FILES += .config .config.old .version \
1399                   Module.symvers \
1400                   signing_key.pem signing_key.priv signing_key.x509     \
1401                   x509.genkey extra_certificates signing_key.x509.keyid \
1402                   signing_key.x509.signer vmlinux-gdb.py \
1403                   *.spec
1404
1405 # Directories & files removed with 'make distclean'
1406 DISTCLEAN_DIRS  +=
1407 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1408
1409 # clean - Delete most, but leave enough to build external modules
1410 #
1411 clean: rm-dirs  := $(CLEAN_DIRS)
1412 clean: rm-files := $(CLEAN_FILES)
1413
1414 PHONY += archclean vmlinuxclean
1415
1416 vmlinuxclean:
1417         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1418         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1419
1420 clean: archclean vmlinuxclean
1421
1422 # mrproper - Delete all generated files, including .config
1423 #
1424 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1425 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1426 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1427
1428 PHONY += $(mrproper-dirs) mrproper
1429 $(mrproper-dirs):
1430         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1431
1432 mrproper: clean $(mrproper-dirs)
1433         $(call cmd,rmdirs)
1434         $(call cmd,rmfiles)
1435
1436 # distclean
1437 #
1438 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1439 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1440
1441 PHONY += distclean
1442
1443 distclean: mrproper
1444         $(call cmd,rmdirs)
1445         $(call cmd,rmfiles)
1446         @find $(srctree) $(RCS_FIND_IGNORE) \
1447                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1448                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1449                 -o -name 'core' \) \
1450                 -type f -print | xargs rm -f
1451
1452
1453 # Packaging of the kernel to various formats
1454 # ---------------------------------------------------------------------------
1455
1456 %src-pkg: FORCE
1457         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1458 %pkg: include/config/kernel.release FORCE
1459         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1460
1461 # Brief documentation of the typical targets used
1462 # ---------------------------------------------------------------------------
1463
1464 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1465 boards := $(sort $(notdir $(boards)))
1466 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1467 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1468
1469 PHONY += help
1470 help:
1471         @echo  'Cleaning targets:'
1472         @echo  '  clean           - Remove most generated files but keep the config and'
1473         @echo  '                    enough build support to build external modules'
1474         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1475         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1476         @echo  ''
1477         @echo  'Configuration targets:'
1478         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1479         @echo  ''
1480         @echo  'Other generic targets:'
1481         @echo  '  all             - Build all targets marked with [*]'
1482         @echo  '* vmlinux         - Build the bare kernel'
1483         @echo  '* modules         - Build all modules'
1484         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1485         @echo  '  dir/            - Build all files in dir and below'
1486         @echo  '  dir/file.[ois]  - Build specified target only'
1487         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1488         @echo  '                    (requires compiler support for LLVM assembly generation)'
1489         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1490         @echo  '                    (requires a recent binutils and recent build (System.map))'
1491         @echo  '  dir/file.ko     - Build module including final link'
1492         @echo  '  modules_prepare - Set up for building external modules'
1493         @echo  '  tags/TAGS       - Generate tags file for editors'
1494         @echo  '  cscope          - Generate cscope index'
1495         @echo  '  gtags           - Generate GNU GLOBAL index'
1496         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1497         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1498         @echo  '  image_name      - Output the image name (use with make -s)'
1499         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1500          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1501          echo  ''
1502         @echo  'Static analysers:'
1503         @echo  '  checkstack      - Generate a list of stack hogs'
1504         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1505         @echo  '  versioncheck    - Sanity check on version.h usage'
1506         @echo  '  includecheck    - Check for duplicate included header files'
1507         @echo  '  export_report   - List the usages of all exported symbols'
1508         @echo  '  headers_check   - Sanity check on exported headers'
1509         @echo  '  headerdep       - Detect inclusion cycles in headers'
1510         @echo  '  coccicheck      - Check with Coccinelle'
1511         @echo  ''
1512         @echo  'Tools:'
1513         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1514         @echo  ''
1515         @echo  'Kernel selftest:'
1516         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1517         @echo  '                    Build, install, and boot kernel before'
1518         @echo  '                    running kselftest on it'
1519         @echo  '  kselftest-clean - Remove all generated kselftest files'
1520         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1521         @echo  '                    .config.'
1522         @echo  ''
1523         @$(if $(dtstree), \
1524                 echo 'Devicetree:'; \
1525                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1526                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1527                 echo '  dt_binding_check - Validate device tree binding documents'; \
1528                 echo '  dtbs_check       - Validate device tree source files';\
1529                 echo '')
1530
1531         @echo 'Userspace tools targets:'
1532         @echo '  use "make tools/help"'
1533         @echo '  or  "cd tools; make help"'
1534         @echo  ''
1535         @echo  'Kernel packaging:'
1536         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1537         @echo  ''
1538         @echo  'Documentation targets:'
1539         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1540         @echo  ''
1541         @echo  'Architecture specific targets ($(SRCARCH)):'
1542         @$(if $(archhelp),$(archhelp),\
1543                 echo '  No architecture specific help defined for $(SRCARCH)')
1544         @echo  ''
1545         @$(if $(boards), \
1546                 $(foreach b, $(boards), \
1547                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1548                 echo '')
1549         @$(if $(board-dirs), \
1550                 $(foreach b, $(board-dirs), \
1551                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1552                 printf "  %-16s - Show all of the above\\n" help-boards; \
1553                 echo '')
1554
1555         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1556         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1557         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1558         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1559         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1560         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1561         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1562         @echo  '                1: warnings which may be relevant and do not occur too often'
1563         @echo  '                2: warnings which occur quite often but may still be relevant'
1564         @echo  '                3: more obscure warnings, can most likely be ignored'
1565         @echo  '                Multiple levels can be combined with W=12 or W=123'
1566         @echo  ''
1567         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1568         @echo  'For further info see the ./README file'
1569
1570
1571 help-board-dirs := $(addprefix help-,$(board-dirs))
1572
1573 help-boards: $(help-board-dirs)
1574
1575 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1576
1577 $(help-board-dirs): help-%:
1578         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1579         @$(if $(boards-per-dir), \
1580                 $(foreach b, $(boards-per-dir), \
1581                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1582                 echo '')
1583
1584
1585 # Documentation targets
1586 # ---------------------------------------------------------------------------
1587 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1588                linkcheckdocs dochelp refcheckdocs
1589 PHONY += $(DOC_TARGETS)
1590 $(DOC_TARGETS):
1591         $(Q)$(MAKE) $(build)=Documentation $@
1592
1593 # Misc
1594 # ---------------------------------------------------------------------------
1595
1596 PHONY += scripts_gdb
1597 scripts_gdb: prepare0
1598         $(Q)$(MAKE) $(build)=scripts/gdb
1599         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1600
1601 ifdef CONFIG_GDB_SCRIPTS
1602 all: scripts_gdb
1603 endif
1604
1605 else # KBUILD_EXTMOD
1606
1607 ###
1608 # External module support.
1609 # When building external modules the kernel used as basis is considered
1610 # read-only, and no consistency checks are made and the make
1611 # system is not used on the basis kernel. If updates are required
1612 # in the basis kernel ordinary make commands (without M=...) must
1613 # be used.
1614 #
1615 # The following are the only valid targets when building external
1616 # modules.
1617 # make M=dir clean     Delete all automatically generated files
1618 # make M=dir modules   Make all modules in specified dir
1619 # make M=dir           Same as 'make M=dir modules'
1620 # make M=dir modules_install
1621 #                      Install the modules built in the module directory
1622 #                      Assumes install directory is already created
1623
1624 # We are always building modules
1625 KBUILD_MODULES := 1
1626
1627 PHONY += $(objtree)/Module.symvers
1628 $(objtree)/Module.symvers:
1629         @test -e $(objtree)/Module.symvers || ( \
1630         echo; \
1631         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1632         echo "           is missing; modules will have no dependencies and modversions."; \
1633         echo )
1634
1635 build-dirs := $(KBUILD_EXTMOD)
1636 PHONY += modules
1637 modules: descend $(objtree)/Module.symvers
1638         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1639
1640 PHONY += modules_install
1641 modules_install: _emodinst_ _emodinst_post
1642
1643 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1644 PHONY += _emodinst_
1645 _emodinst_:
1646         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1647         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1648
1649 PHONY += _emodinst_post
1650 _emodinst_post: _emodinst_
1651         $(call cmd,depmod)
1652
1653 clean-dirs := $(KBUILD_EXTMOD)
1654 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1655
1656 PHONY += /
1657 /:
1658         @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1659
1660 PHONY += help
1661 help:
1662         @echo  '  Building external modules.'
1663         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1664         @echo  ''
1665         @echo  '  modules         - default target, build the module(s)'
1666         @echo  '  modules_install - install the module'
1667         @echo  '  clean           - remove generated files in module directory only'
1668         @echo  ''
1669
1670 PHONY += prepare
1671 endif # KBUILD_EXTMOD
1672
1673 # Handle descending into subdirectories listed in $(build-dirs)
1674 # Preset locale variables to speed up the build process. Limit locale
1675 # tweaks to this spot to avoid wrong language settings when running
1676 # make menuconfig etc.
1677 # Error messages still appears in the original language
1678 PHONY += descend $(build-dirs)
1679 descend: $(build-dirs)
1680 $(build-dirs): prepare
1681         $(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1
1682
1683 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1684 PHONY += $(clean-dirs) clean
1685 $(clean-dirs):
1686         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1687
1688 clean: $(clean-dirs)
1689         $(call cmd,rmdirs)
1690         $(call cmd,rmfiles)
1691         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1692                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1693                 -o -name '*.ko.*' \
1694                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1695                 -o -name '*.dwo' -o -name '*.lst' \
1696                 -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
1697                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1698                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1699                 -o -name '*.asn1.[ch]' \
1700                 -o -name '*.symtypes' -o -name 'modules.order' \
1701                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1702                 -o -name '*.c.[012]*.*' \
1703                 -o -name '*.ll' \
1704                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1705
1706 # Generate tags for editors
1707 # ---------------------------------------------------------------------------
1708 quiet_cmd_tags = GEN     $@
1709       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1710
1711 tags TAGS cscope gtags: FORCE
1712         $(call cmd,tags)
1713
1714 # Script to generate missing namespace dependencies
1715 # ---------------------------------------------------------------------------
1716
1717 PHONY += nsdeps
1718
1719 nsdeps: modules
1720         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
1721         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1722
1723 # Scripts to check various things for consistency
1724 # ---------------------------------------------------------------------------
1725
1726 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1727
1728 includecheck:
1729         find $(srctree)/* $(RCS_FIND_IGNORE) \
1730                 -name '*.[hcS]' -type f -print | sort \
1731                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1732
1733 versioncheck:
1734         find $(srctree)/* $(RCS_FIND_IGNORE) \
1735                 -name '*.[hcS]' -type f -print | sort \
1736                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1737
1738 coccicheck:
1739         $(Q)$(BASH) $(srctree)/scripts/$@
1740
1741 namespacecheck:
1742         $(PERL) $(srctree)/scripts/namespace.pl
1743
1744 export_report:
1745         $(PERL) $(srctree)/scripts/export_report.pl
1746
1747 PHONY += checkstack kernelrelease kernelversion image_name
1748
1749 # UML needs a little special treatment here.  It wants to use the host
1750 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1751 # else wants $(ARCH), including people doing cross-builds, which means
1752 # that $(SUBARCH) doesn't work here.
1753 ifeq ($(ARCH), um)
1754 CHECKSTACK_ARCH := $(SUBARCH)
1755 else
1756 CHECKSTACK_ARCH := $(ARCH)
1757 endif
1758 checkstack:
1759         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1760         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1761
1762 kernelrelease:
1763         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1764
1765 kernelversion:
1766         @echo $(KERNELVERSION)
1767
1768 image_name:
1769         @echo $(KBUILD_IMAGE)
1770
1771 # Clear a bunch of variables before executing the submake
1772
1773 ifeq ($(quiet),silent_)
1774 tools_silent=s
1775 endif
1776
1777 tools/: FORCE
1778         $(Q)mkdir -p $(objtree)/tools
1779         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1780
1781 tools/%: FORCE
1782         $(Q)mkdir -p $(objtree)/tools
1783         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1784
1785 # Single targets
1786 # ---------------------------------------------------------------------------
1787 # To build individual files in subdirectories, you can do like this:
1788 #
1789 #   make foo/bar/baz.s
1790 #
1791 # The supported suffixes for single-target are listed in 'single-targets'
1792 #
1793 # To build only under specific subdirectories, you can do like this:
1794 #
1795 #   make foo/bar/baz/
1796
1797 ifdef single-build
1798
1799 single-all := $(filter $(single-targets), $(MAKECMDGOALS))
1800
1801 # .ko is special because modpost is needed
1802 single-ko := $(sort $(filter %.ko, $(single-all)))
1803 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all)))
1804
1805 $(single-ko): single_modpost
1806         @:
1807 $(single-no-ko): descend
1808         @:
1809
1810 ifeq ($(KBUILD_EXTMOD),)
1811 # For the single build of in-tree modules, use a temporary file to avoid
1812 # the situation of modules_install installing an invalid modules.order.
1813 MODORDER := .modules.tmp
1814 endif
1815
1816 PHONY += single_modpost
1817 single_modpost: $(single-no-ko)
1818         $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1819         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1820
1821 KBUILD_MODULES := 1
1822
1823 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1824
1825 single-build = $(if $(filter-out $@/, $(single-no-ko)),1)
1826
1827 endif
1828
1829 # FIXME Should go into a make.lib or something
1830 # ===========================================================================
1831
1832 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1833       cmd_rmdirs = rm -rf $(rm-dirs)
1834
1835 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1836       cmd_rmfiles = rm -f $(rm-files)
1837
1838 # Run depmod only if we have System.map and depmod is executable
1839 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1840       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1841                    $(KERNELRELEASE)
1842
1843 # read saved command lines for existing targets
1844 existing-targets := $(wildcard $(sort $(targets)))
1845
1846 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1847
1848 endif # config-targets
1849 endif # mixed-build
1850 endif # need-sub-make
1851
1852 PHONY += FORCE
1853 FORCE:
1854
1855 # Declare the contents of the PHONY variable as phony.  We keep that
1856 # information in a variable so we can use it in if_changed and friends.
1857 .PHONY: $(PHONY)