Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 4
   3 PATCHLEVEL = 18
   4 SUBLEVEL = 17
   5 EXTRAVERSION =
   6 NAME = Merciless Moray
   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 # o Do not use make's built-in rules and variables
  19 #   (this increases performance and avoids hard-to-debug behaviour);
  20 # o Look for make include files relative to root of kernel src
  21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23 # Avoid funny character set dependencies
  24 unexport LC_ALL
  25 LC_COLLATE=C
  26 LC_NUMERIC=C
  27 export LC_COLLATE LC_NUMERIC
  28
  29 # Avoid interference with shell env settings
  30 unexport GREP_OPTIONS
  31
  32 # We are using a recursive build, so we need to do a little thinking
  33 # to get the ordering right.
  34 #
  35 # Most importantly: sub-Makefiles should only ever modify files in
  36 # their own directory. If in some directory we have a dependency on
  37 # a file in another dir (which doesn't happen often, but it's often
  38 # unavoidable when linking the built-in.a targets which finally
  39 # turn into vmlinux), we will call a sub make in that other dir, and
  40 # after that we are sure that everything which is in that other dir
  41 # is now up to date.
  42 #
  43 # The only cases where we need to modify files which have global
  44 # effects are thus separated out and done before the recursive
  45 # descending is started. They are now explicitly listed as the
  46 # prepare rule.
  47
  48 # Beautify output
  49 # ---------------------------------------------------------------------------
  50 #
  51 # Normally, we echo the whole command before executing it. By making
  52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  53 # $(quiet) to choose other forms of output instead, e.g.
  54 #
  55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57 #
  58 # If $(quiet) is empty, the whole command will be printed.
  59 # If it is set to "quiet_", only the short version will be printed.
  60 # If it is set to "silent_", nothing will be printed at all, since
  61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  62 #
  63 # A simple variant is to prefix commands with $(Q) - that's useful
  64 # for commands that shall be hidden in non-verbose mode.
  65 #
  66 #       $(Q)ln $@ :<
  67 #
  68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70 #
  71 # To put more focus on warnings, be less verbose as default
  72 # Use 'make V=1' to see the full commands
  73
  74 ifeq ("$(origin V)", "command line")
  75   KBUILD_VERBOSE = $(V)
  76 endif
  77 ifndef KBUILD_VERBOSE
  78   KBUILD_VERBOSE = 0
  79 endif
  80
  81 ifeq ($(KBUILD_VERBOSE),1)
  82   quiet =
  83   Q =
  84 else
  85   quiet=quiet_
  86   Q = @
  87 endif
  88
  89 # If the user is running make -s (silent mode), suppress echoing of
  90 # commands
  91
  92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93   quiet=silent_
  94   tools_silent=s
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is not intended to be used by the regular user (for now),
 115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116 ifeq ($(KBUILD_SRC),)
 117
 118 # OK, Make called in directory where kernel src resides
 119 # Do we want to locate output files in a separate directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 # Cancel implicit rules on top Makefile
 125 $(CURDIR)/Makefile Makefile: ;
 126
 127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128   $(error main directory cannot contain spaces nor colons)
 129 endif
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # check that the output directory actually exists
 133 saved-output := $(KBUILD_OUTPUT)
 134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                 && pwd)
 136 $(if $(KBUILD_OUTPUT),, \
 137      $(error failed to create output directory "$(saved-output)"))
 138
 139 PHONY += $(MAKECMDGOALS) sub-make
 140
 141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142         @:
 143
 144 # Invoke a second make in the output directory, passing relevant variables
 145 sub-make:
 146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149 # Leave processing to above invocation of make
 150 skip-makefile := 1
 151 endif # ifneq ($(KBUILD_OUTPUT),)
 152 endif # ifeq ($(KBUILD_SRC),)
 153
 154 # We process the rest of the Makefile if this is the final invocation of make
 155 ifeq ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 170 # including where to get the "sparse" utility.
 171
 172 ifeq ("$(origin C)", "command line")
 173   KBUILD_CHECKSRC = $(C)
 174 endif
 175 ifndef KBUILD_CHECKSRC
 176   KBUILD_CHECKSRC = 0
 177 endif
 178
 179 # Use make M=dir to specify directory of external module to build
 180 # Old syntax make ... SUBDIRS=$PWD is still supported
 181 # Setting the environment variable KBUILD_EXTMOD take precedence
 182 ifdef SUBDIRS
 183   KBUILD_EXTMOD ?= $(SUBDIRS)
 184 endif
 185
 186 ifeq ("$(origin M)", "command line")
 187   KBUILD_EXTMOD := $(M)
 188 endif
 189
 190 ifeq ($(KBUILD_SRC),)
 191         # building in the source tree
 192         srctree := .
 193 else
 194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                 # building in a subdirectory of the source tree
 196                 srctree := ..
 197         else
 198                 srctree := $(KBUILD_SRC)
 199         endif
 200 endif
 201
 202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204 objtree         := .
 205 src             := $(srctree)
 206 obj             := $(objtree)
 207
 208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210 export srctree objtree VPATH
 211
 212 # To make sure we do not include .config for any of the *config targets
 213 # catch them early, and hand them over to scripts/kconfig/Makefile
 214 # It is allowed to specify more targets when calling make, including
 215 # mixing *config targets and build targets.
 216 # For example 'make oldconfig all'.
 217 # Detect when mixed targets is specified, and make a second invocation
 218 # of make so .config is not included in this case either (for *config).
 219
 220 version_h := include/generated/uapi/linux/version.h
 221 old_version_h := include/linux/version.h
 222
 223 clean-targets := %clean mrproper cleandocs
 224 no-dot-config-targets := $(clean-targets) \
 225                          cscope gtags TAGS tags help% %docs check% coccicheck \
 226                          $(version_h) headers_% archheaders archscripts \
 227                          kernelversion %src-pkg
 228 no-sync-config-targets := $(no-dot-config-targets) install %install
 229
 230 config-targets  := 0
 231 mixed-targets   := 0
 232 dot-config      := 1
 233 may-sync-config := 1
 234
 235 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 236         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 237                 dot-config := 0
 238         endif
 239 endif
 240
 241 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 242         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 243                 may-sync-config := 0
 244         endif
 245 endif
 246
 247 ifneq ($(KBUILD_EXTMOD),)
 248         may-sync-config := 0
 249 endif
 250
 251 ifeq ($(KBUILD_EXTMOD),)
 252         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 253                 config-targets := 1
 254                 ifneq ($(words $(MAKECMDGOALS)),1)
 255                         mixed-targets := 1
 256                 endif
 257         endif
 258 endif
 259
 260 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 261 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 262         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 263                 mixed-targets := 1
 264         endif
 265 endif
 266
 267 # install and modules_install need also be processed one by one
 268 ifneq ($(filter install,$(MAKECMDGOALS)),)
 269         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 270                 mixed-targets := 1
 271         endif
 272 endif
 273
 274 ifeq ($(mixed-targets),1)
 275 # ===========================================================================
 276 # We're called with mixed targets (*config and build targets).
 277 # Handle them one by one.
 278
 279 PHONY += $(MAKECMDGOALS) __build_one_by_one
 280
 281 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 282         @:
 283
 284 __build_one_by_one:
 285         $(Q)set -e; \
 286         for i in $(MAKECMDGOALS); do \
 287                 $(MAKE) -f $(srctree)/Makefile $$i; \
 288         done
 289
 290 else
 291
 292 # We need some generic definitions (do not try to remake the file).
 293 scripts/Kbuild.include: ;
 294 include scripts/Kbuild.include
 295
 296 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 297 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 298 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 299 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 300
 301 include scripts/subarch.include
 302
 303 # Cross compiling and selecting different set of gcc/bin-utils
 304 # ---------------------------------------------------------------------------
 305 #
 306 # When performing cross compilation for other architectures ARCH shall be set
 307 # to the target architecture. (See arch/* for the possibilities).
 308 # ARCH can be set during invocation of make:
 309 # make ARCH=ia64
 310 # Another way is to have ARCH set in the environment.
 311 # The default ARCH is the host where make is executed.
 312
 313 # CROSS_COMPILE specify the prefix used for all executables used
 314 # during compilation. Only gcc and related bin-utils executables
 315 # are prefixed with $(CROSS_COMPILE).
 316 # CROSS_COMPILE can be set on the command line
 317 # make CROSS_COMPILE=ia64-linux-
 318 # Alternatively CROSS_COMPILE can be set in the environment.
 319 # Default value for CROSS_COMPILE is not to prefix executables
 320 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 321 ARCH            ?= $(SUBARCH)
 322
 323 # Architecture as present in compile.h
 324 UTS_MACHINE     := $(ARCH)
 325 SRCARCH         := $(ARCH)
 326
 327 # Additional ARCH settings for x86
 328 ifeq ($(ARCH),i386)
 329         SRCARCH := x86
 330 endif
 331 ifeq ($(ARCH),x86_64)
 332         SRCARCH := x86
 333 endif
 334
 335 # Additional ARCH settings for sparc
 336 ifeq ($(ARCH),sparc32)
 337        SRCARCH := sparc
 338 endif
 339 ifeq ($(ARCH),sparc64)
 340        SRCARCH := sparc
 341 endif
 342
 343 # Additional ARCH settings for sh
 344 ifeq ($(ARCH),sh64)
 345        SRCARCH := sh
 346 endif
 347
 348 KCONFIG_CONFIG  ?= .config
 349 export KCONFIG_CONFIG
 350
 351 # SHELL used by kbuild
 352 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 353           else if [ -x /bin/bash ]; then echo /bin/bash; \
 354           else echo sh; fi ; fi)
 355
 356 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 357 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 358 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 359
 360 HOSTCC       = gcc
 361 HOSTCXX      = g++
 362 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 363                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 364 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 365 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 366 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 367
 368 # Make variables (CC, etc...)
 369 AS              = $(CROSS_COMPILE)as
 370 LD              = $(CROSS_COMPILE)ld
 371 CC              = $(CROSS_COMPILE)gcc
 372 CPP             = $(CC) -E
 373 AR              = $(CROSS_COMPILE)ar
 374 NM              = $(CROSS_COMPILE)nm
 375 STRIP           = $(CROSS_COMPILE)strip
 376 OBJCOPY         = $(CROSS_COMPILE)objcopy
 377 OBJDUMP         = $(CROSS_COMPILE)objdump
 378 LEX             = flex
 379 YACC            = bison
 380 AWK             = awk
 381 GENKSYMS        = scripts/genksyms/genksyms
 382 INSTALLKERNEL  := installkernel
 383 DEPMOD          = /sbin/depmod
 384 PERL            = perl
 385 PYTHON          = python
 386 PYTHON2         = python2
 387 PYTHON3         = python3
 388 CHECK           = sparse
 389
 390 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 391                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 392 NOSTDINC_FLAGS  =
 393 CFLAGS_MODULE   =
 394 AFLAGS_MODULE   =
 395 LDFLAGS_MODULE  =
 396 CFLAGS_KERNEL   =
 397 AFLAGS_KERNEL   =
 398 LDFLAGS_vmlinux =
 399
 400 # Use USERINCLUDE when you must reference the UAPI directories only.
 401 USERINCLUDE    := \
 402                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 403                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 404                 -I$(srctree)/include/uapi \
 405                 -I$(objtree)/include/generated/uapi \
 406                 -include $(srctree)/include/linux/kconfig.h
 407
 408 # Use LINUXINCLUDE when you must reference the include/ directory.
 409 # Needed to be compatible with the O= option
 410 LINUXINCLUDE    := \
 411                 -I$(srctree)/arch/$(SRCARCH)/include \
 412                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 413                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 414                 -I$(objtree)/include \
 415                 $(USERINCLUDE)
 416
 417 KBUILD_AFLAGS   := -D__ASSEMBLY__
 418 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 419                    -fno-strict-aliasing -fno-common -fshort-wchar \
 420                    -Werror-implicit-function-declaration \
 421                    -Wno-format-security \
 422                    -std=gnu89
 423 KBUILD_CPPFLAGS := -D__KERNEL__
 424 KBUILD_AFLAGS_KERNEL :=
 425 KBUILD_CFLAGS_KERNEL :=
 426 KBUILD_AFLAGS_MODULE  := -DMODULE
 427 KBUILD_CFLAGS_MODULE  := -DMODULE
 428 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 429 LDFLAGS :=
 430 GCC_PLUGINS_CFLAGS :=
 431
 432 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 433 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 434 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 435 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 436
 437 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 438 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 439 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 440 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 441 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 442 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 443 export KBUILD_ARFLAGS
 444
 445 # When compiling out-of-tree modules, put MODVERDIR in the module
 446 # tree rather than in the kernel tree. The kernel tree might
 447 # even be read-only.
 448 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 449
 450 # Files to ignore in find ... statements
 451
 452 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 453                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 454                           -prune -o
 455 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 456                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 457
 458 # ===========================================================================
 459 # Rules shared between *config targets and build targets
 460
 461 # Basic helpers built in scripts/basic/
 462 PHONY += scripts_basic
 463 scripts_basic:
 464         $(Q)$(MAKE) $(build)=scripts/basic
 465         $(Q)rm -f .tmp_quiet_recordmcount
 466
 467 # To avoid any implicit rule to kick in, define an empty command.
 468 scripts/basic/%: scripts_basic ;
 469
 470 PHONY += outputmakefile
 471 # outputmakefile generates a Makefile in the output directory, if using a
 472 # separate output directory. This allows convenient use of make in the
 473 # output directory.
 474 outputmakefile:
 475 ifneq ($(KBUILD_SRC),)
 476         $(Q)ln -fsn $(srctree) source
 477         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 478             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 479 endif
 480
 481 ifeq ($(cc-name),clang)
 482 ifneq ($(CROSS_COMPILE),)
 483 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 484 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 485 endif
 486 ifneq ($(GCC_TOOLCHAIN),)
 487 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 488 endif
 489 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 490 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 491 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 492 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 493 endif
 494
 495 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 496 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 497 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 498 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 499 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 500 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 501 export RETPOLINE_CFLAGS
 502 export RETPOLINE_VDSO_CFLAGS
 503
 504 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 505 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 506
 507 # check for 'asm goto'
 508 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 509   CC_HAVE_ASM_GOTO := 1
 510   KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 511   KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 512 endif
 513
 514 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 515 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 516 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 517 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 518 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 519
 520 ifeq ($(config-targets),1)
 521 # ===========================================================================
 522 # *config targets only - make sure prerequisites are updated, and descend
 523 # in scripts/kconfig to make the *config target
 524
 525 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 526 # KBUILD_DEFCONFIG may point out an alternative default configuration
 527 # used for 'make defconfig'
 528 include arch/$(SRCARCH)/Makefile
 529 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 530
 531 config: scripts_basic outputmakefile FORCE
 532         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 533
 534 %config: scripts_basic outputmakefile FORCE
 535         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 536
 537 else
 538 # ===========================================================================
 539 # Build targets only - this includes vmlinux, arch specific targets, clean
 540 # targets and others. In general all targets except *config targets.
 541
 542 # If building an external module we do not care about the all: rule
 543 # but instead _all depend on modules
 544 PHONY += all
 545 ifeq ($(KBUILD_EXTMOD),)
 546 _all: all
 547 else
 548 _all: modules
 549 endif
 550
 551 # Decide whether to build built-in, modular, or both.
 552 # Normally, just do built-in.
 553
 554 KBUILD_MODULES :=
 555 KBUILD_BUILTIN := 1
 556
 557 # If we have only "make modules", don't compile built-in objects.
 558 # When we're building modules with modversions, we need to consider
 559 # the built-in objects during the descend as well, in order to
 560 # make sure the checksums are up to date before we record them.
 561
 562 ifeq ($(MAKECMDGOALS),modules)
 563   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 564 endif
 565
 566 # If we have "make <whatever> modules", compile modules
 567 # in addition to whatever we do anyway.
 568 # Just "make" or "make all" shall build modules as well
 569
 570 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 571   KBUILD_MODULES := 1
 572 endif
 573
 574 ifeq ($(MAKECMDGOALS),)
 575   KBUILD_MODULES := 1
 576 endif
 577
 578 export KBUILD_MODULES KBUILD_BUILTIN
 579
 580 ifeq ($(KBUILD_EXTMOD),)
 581 # Objects we will link into vmlinux / subdirs we need to visit
 582 init-y          := init/
 583 drivers-y       := drivers/ sound/ firmware/
 584 net-y           := net/
 585 libs-y          := lib/
 586 core-y          := usr/
 587 virt-y          := virt/
 588 endif # KBUILD_EXTMOD
 589
 590 ifeq ($(dot-config),1)
 591 -include include/config/auto.conf
 592 endif
 593
 594 # The all: target is the default when no target is given on the
 595 # command line.
 596 # This allow a user to issue only 'make' to build a kernel including modules
 597 # Defaults to vmlinux, but the arch makefile usually adds further targets
 598 all: vmlinux
 599
 600 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 601         $(call cc-option,-fno-tree-loop-im) \
 602         $(call cc-disable-warning,maybe-uninitialized,)
 603 export CFLAGS_GCOV
 604
 605 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 606 # values of the respective KBUILD_* variables
 607 ARCH_CPPFLAGS :=
 608 ARCH_AFLAGS :=
 609 ARCH_CFLAGS :=
 610 include arch/$(SRCARCH)/Makefile
 611
 612 ifeq ($(dot-config),1)
 613 ifeq ($(may-sync-config),1)
 614 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 615 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 616 # because some architectures define CROSS_COMPILE there.
 617 -include include/config/auto.conf.cmd
 618
 619 # To avoid any implicit rule to kick in, define an empty command
 620 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 621
 622 # The actual configuration files used during the build are stored in
 623 # include/generated/ and include/config/. Update them if .config is newer than
 624 # include/config/auto.conf (which mirrors .config).
 625 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 626         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 627 else
 628 # External modules and some install targets need include/generated/autoconf.h
 629 # and include/config/auto.conf but do not care if they are up-to-date.
 630 # Use auto.conf to trigger the test
 631 PHONY += include/config/auto.conf
 632
 633 include/config/auto.conf:
 634         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 635         echo >&2;                                                       \
 636         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 637         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 638         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 639         echo >&2 ;                                                      \
 640         /bin/false)
 641
 642 endif # may-sync-config
 643
 644 else
 645 # Dummy target needed, because used as prerequisite
 646 include/config/auto.conf: ;
 647 endif # $(dot-config)
 648
 649 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 650 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 651 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 652 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 653 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 654
 655 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 656 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 657 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 658 else
 659 ifdef CONFIG_PROFILE_ALL_BRANCHES
 660 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 661 else
 662 KBUILD_CFLAGS   += -O2
 663 endif
 664 endif
 665
 666 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 667                         $(call cc-disable-warning,maybe-uninitialized,))
 668
 669 # Tell gcc to never replace conditional load with a non-conditional one
 670 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 671
 672 include scripts/Makefile.kcov
 673 include scripts/Makefile.gcc-plugins
 674
 675 ifdef CONFIG_READABLE_ASM
 676 # Disable optimizations that make assembler listings hard to read.
 677 # reorder blocks reorders the control in the function
 678 # ipa clone creates specialized cloned functions
 679 # partial inlining inlines only parts of functions
 680 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 681                  $(call cc-option,-fno-ipa-cp-clone,) \
 682                  $(call cc-option,-fno-partial-inlining)
 683 endif
 684
 685 ifneq ($(CONFIG_FRAME_WARN),0)
 686 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 687 endif
 688
 689 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 690 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 691 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 692
 693 KBUILD_CFLAGS += $(stackp-flags-y)
 694
 695 ifeq ($(cc-name),clang)
 696 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 697 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 698 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 699 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 700 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 701 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 702 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 703 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 704 # See modpost pattern 2
 705 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 706 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 707 else
 708
 709 # These warnings generated too much noise in a regular build.
 710 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 711 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 712 endif
 713
 714 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 715 ifdef CONFIG_FRAME_POINTER
 716 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 717 else
 718 # Some targets (ARM with Thumb2, for example), can't be built with frame
 719 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 720 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 721 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 722 # -fomit-frame-pointer with FUNCTION_TRACER.
 723 ifndef CONFIG_FUNCTION_TRACER
 724 KBUILD_CFLAGS   += -fomit-frame-pointer
 725 endif
 726 endif
 727
 728 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 729
 730 ifdef CONFIG_DEBUG_INFO
 731 ifdef CONFIG_DEBUG_INFO_SPLIT
 732 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 733 else
 734 KBUILD_CFLAGS   += -g
 735 endif
 736 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 737 endif
 738 ifdef CONFIG_DEBUG_INFO_DWARF4
 739 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 740 endif
 741
 742 ifdef CONFIG_DEBUG_INFO_REDUCED
 743 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 744                    $(call cc-option,-fno-var-tracking)
 745 endif
 746
 747 ifdef CONFIG_FUNCTION_TRACER
 748 ifndef CC_FLAGS_FTRACE
 749 CC_FLAGS_FTRACE := -pg
 750 endif
 751 export CC_FLAGS_FTRACE
 752 ifdef CONFIG_HAVE_FENTRY
 753 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 754 endif
 755 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 756 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 757 ifdef CONFIG_DYNAMIC_FTRACE
 758         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 759                 BUILD_C_RECORDMCOUNT := y
 760                 export BUILD_C_RECORDMCOUNT
 761         endif
 762 endif
 763 endif
 764
 765 # We trigger additional mismatches with less inlining
 766 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 767 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 768 endif
 769
 770 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 771 KBUILD_CFLAGS_KERNEL    += $(call cc-option,-ffunction-sections,)
 772 KBUILD_CFLAGS_KERNEL    += $(call cc-option,-fdata-sections,)
 773 endif
 774
 775 # arch Makefile may override CC so keep this after arch Makefile is included
 776 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 777
 778 # warn about C99 declaration after statement
 779 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 780
 781 # disable pointer signed / unsigned warnings in gcc 4.0
 782 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 783
 784 # disable invalid "can't wrap" optimizations for signed / pointers
 785 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 786
 787 # clang sets -fmerge-all-constants by default as optimization, but this
 788 # is non-conforming behavior for C and in fact breaks the kernel, so we
 789 # need to disable it here generally.
 790 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 791
 792 # for gcc -fno-merge-all-constants disables everything, but it is fine
 793 # to have actual conforming behavior enabled.
 794 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 795
 796 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 797 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 798
 799 # conserve stack if available
 800 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 801
 802 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 803 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 804
 805 # require functions to have arguments in prototypes, not empty 'int foo()'
 806 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 807
 808 # Prohibit date/time macros, which would make the build non-deterministic
 809 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 810
 811 # enforce correct pointer usage
 812 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 813
 814 # Require designated initializers for all marked structures
 815 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 816
 817 # change __FILE__ to the relative path from the srctree
 818 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 819
 820 # use the deterministic mode of AR if available
 821 KBUILD_ARFLAGS := $(call ar-option,D)
 822
 823 include scripts/Makefile.kasan
 824 include scripts/Makefile.extrawarn
 825 include scripts/Makefile.ubsan
 826
 827 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 828 # last assignments
 829 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 830 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 831 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 832
 833 # Use --build-id when available.
 834 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 835 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 836 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 837
 838 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 839 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 840 endif
 841
 842 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 843 LDFLAGS_vmlinux += $(call ld-option, -X,)
 844 endif
 845
 846 # insure the checker run with the right endianness
 847 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 848
 849 # the checker needs the correct machine size
 850 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 851
 852 # Default kernel image to build when no specific target is given.
 853 # KBUILD_IMAGE may be overruled on the command line or
 854 # set in the environment
 855 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 856 # this default value
 857 export KBUILD_IMAGE ?= vmlinux
 858
 859 #
 860 # INSTALL_PATH specifies where to place the updated kernel and system map
 861 # images. Default is /boot, but you can set it to other values
 862 export  INSTALL_PATH ?= /boot
 863
 864 #
 865 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 866 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 867 # an argument if needed. Otherwise it defaults to the kernel install path
 868 #
 869 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 870
 871 #
 872 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 873 # relocations required by build roots.  This is not defined in the
 874 # makefile but the argument can be passed to make if needed.
 875 #
 876
 877 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 878 export MODLIB
 879
 880 #
 881 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 882 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 883 # the default option --strip-debug will be used.  Otherwise,
 884 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 885
 886 ifdef INSTALL_MOD_STRIP
 887 ifeq ($(INSTALL_MOD_STRIP),1)
 888 mod_strip_cmd = $(STRIP) --strip-debug
 889 else
 890 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 891 endif # INSTALL_MOD_STRIP=1
 892 else
 893 mod_strip_cmd = true
 894 endif # INSTALL_MOD_STRIP
 895 export mod_strip_cmd
 896
 897 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 898 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 899 # or CONFIG_MODULE_COMPRESS_XZ.
 900
 901 mod_compress_cmd = true
 902 ifdef CONFIG_MODULE_COMPRESS
 903   ifdef CONFIG_MODULE_COMPRESS_GZIP
 904     mod_compress_cmd = gzip -n -f
 905   endif # CONFIG_MODULE_COMPRESS_GZIP
 906   ifdef CONFIG_MODULE_COMPRESS_XZ
 907     mod_compress_cmd = xz -f
 908   endif # CONFIG_MODULE_COMPRESS_XZ
 909 endif # CONFIG_MODULE_COMPRESS
 910 export mod_compress_cmd
 911
 912 # Select initial ramdisk compression format, default is gzip(1).
 913 # This shall be used by the dracut(8) tool while creating an initramfs image.
 914 #
 915 INITRD_COMPRESS-y                  := gzip
 916 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 917 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 918 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 919 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 920 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 921 # do not export INITRD_COMPRESS, since we didn't actually
 922 # choose a sane default compression above.
 923 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 924
 925 ifdef CONFIG_MODULE_SIG_ALL
 926 $(eval $(call config_filename,MODULE_SIG_KEY))
 927
 928 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 929 else
 930 mod_sign_cmd = true
 931 endif
 932 export mod_sign_cmd
 933
 934 ifdef CONFIG_STACK_VALIDATION
 935   has_libelf := $(call try-run,\
 936                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 937   ifeq ($(has_libelf),1)
 938     objtool_target := tools/objtool FORCE
 939   else
 940     ifdef CONFIG_UNWINDER_ORC
 941       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 942     else
 943       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 944     endif
 945     SKIP_STACK_VALIDATION := 1
 946     export SKIP_STACK_VALIDATION
 947   endif
 948 endif
 949
 950
 951 ifeq ($(KBUILD_EXTMOD),)
 952 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 953
 954 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 955                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 956                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 957
 958 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 959                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 960
 961 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 962 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 963 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 964 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 965 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 966 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 967 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 968
 969 # Externally visible symbols (used by link-vmlinux.sh)
 970 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 971 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 972 export KBUILD_VMLINUX_LIBS := $(libs-y1)
 973 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 974 export LDFLAGS_vmlinux
 975 # used by scripts/package/Makefile
 976 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 977
 978 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 979
 980 # Recurse until adjust_autoksyms.sh is satisfied
 981 PHONY += autoksyms_recursive
 982 autoksyms_recursive: $(vmlinux-deps)
 983 ifdef CONFIG_TRIM_UNUSED_KSYMS
 984         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 985           "$(MAKE) -f $(srctree)/Makefile vmlinux"
 986 endif
 987
 988 # For the kernel to actually contain only the needed exported symbols,
 989 # we have to build modules as well to determine what those symbols are.
 990 # (this can be evaluated only once include/config/auto.conf has been included)
 991 ifdef CONFIG_TRIM_UNUSED_KSYMS
 992   KBUILD_MODULES := 1
 993 endif
 994
 995 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
 996
 997 $(autoksyms_h):
 998         $(Q)mkdir -p $(dir $@)
 999         $(Q)touch $@
1000
1001 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1002
1003 # Final link of vmlinux with optional arch pass after final link
1004 cmd_link-vmlinux =                                                 \
1005         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1006         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1007
1008 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1009 ifdef CONFIG_HEADERS_CHECK
1010         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1011 endif
1012 ifdef CONFIG_GDB_SCRIPTS
1013         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1014 endif
1015         +$(call if_changed,link-vmlinux)
1016
1017 # Build samples along the rest of the kernel
1018 ifdef CONFIG_SAMPLES
1019 vmlinux-dirs += samples
1020 endif
1021
1022 # The actual objects are generated when descending,
1023 # make sure no implicit rule kicks in
1024 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1025
1026 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1027 # Preset locale variables to speed up the build process. Limit locale
1028 # tweaks to this spot to avoid wrong language settings when running
1029 # make menuconfig etc.
1030 # Error messages still appears in the original language
1031
1032 PHONY += $(vmlinux-dirs)
1033 $(vmlinux-dirs): prepare scripts
1034         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1035
1036 define filechk_kernel.release
1037         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1038 endef
1039
1040 # Store (new) KERNELRELEASE string in include/config/kernel.release
1041 include/config/kernel.release: include/config/auto.conf FORCE
1042         $(call filechk,kernel.release)
1043
1044 # Additional helpers built in scripts/
1045 # Carefully list dependencies so we do not try to build scripts twice
1046 # in parallel
1047 PHONY += scripts
1048 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
1049          asm-generic gcc-plugins $(autoksyms_h)
1050         $(Q)$(MAKE) $(build)=$(@)
1051
1052 # Things we need to do before we recursively start building the kernel
1053 # or the modules are listed in "prepare".
1054 # A multi level approach is used. prepareN is processed before prepareN-1.
1055 # archprepare is used in arch Makefiles and when processed asm symlink,
1056 # version.h and scripts_basic is processed / created.
1057
1058 # Listed in dependency order
1059 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1060
1061 # prepare3 is used to check if we are building in a separate output directory,
1062 # and if so do:
1063 # 1) Check that make has not been executed in the kernel src $(srctree)
1064 prepare3: include/config/kernel.release
1065 ifneq ($(KBUILD_SRC),)
1066         @$(kecho) '  Using $(srctree) as source for kernel'
1067         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1068                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1069                 echo >&2 "  in the '$(srctree)' directory.";\
1070                 /bin/false; \
1071         fi;
1072 endif
1073
1074 # prepare2 creates a makefile if using a separate output directory.
1075 # From this point forward, .config has been reprocessed, so any rules
1076 # that need to depend on updated CONFIG_* values can be checked here.
1077 prepare2: prepare3 outputmakefile asm-generic
1078
1079 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1080                    include/config/auto.conf
1081         $(cmd_crmodverdir)
1082
1083 archprepare: archheaders archscripts prepare1 scripts_basic
1084
1085 prepare0: archprepare gcc-plugins
1086         $(Q)$(MAKE) $(build)=.
1087
1088 # All the preparing..
1089 prepare: prepare0 prepare-objtool
1090
1091 # Support for using generic headers in asm-generic
1092 PHONY += asm-generic uapi-asm-generic
1093 asm-generic: uapi-asm-generic
1094         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1095                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1096 uapi-asm-generic:
1097         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1098                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1099
1100 PHONY += prepare-objtool
1101 prepare-objtool: $(objtool_target)
1102
1103 # Generate some files
1104 # ---------------------------------------------------------------------------
1105
1106 # KERNELRELEASE can change from a few different places, meaning version.h
1107 # needs to be updated, so this check is forced on all builds
1108
1109 uts_len := 64
1110 define filechk_utsrelease.h
1111         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1112           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1113           exit 1;                                                         \
1114         fi;                                                               \
1115         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1116 endef
1117
1118 define filechk_version.h
1119         (echo \#define LINUX_VERSION_CODE $(shell                         \
1120         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1121         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1122 endef
1123
1124 $(version_h): $(srctree)/Makefile FORCE
1125         $(call filechk,version.h)
1126         $(Q)rm -f $(old_version_h)
1127
1128 include/generated/utsrelease.h: include/config/kernel.release FORCE
1129         $(call filechk,utsrelease.h)
1130
1131 PHONY += headerdep
1132 headerdep:
1133         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1134         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1135
1136 # ---------------------------------------------------------------------------
1137 # Kernel headers
1138
1139 #Default location for installed headers
1140 export INSTALL_HDR_PATH = $(objtree)/usr
1141
1142 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1143 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1144
1145 PHONY += archheaders
1146 archheaders:
1147
1148 PHONY += archscripts
1149 archscripts:
1150
1151 PHONY += __headers
1152 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1153         $(Q)$(MAKE) $(build)=scripts build_unifdef
1154
1155 PHONY += headers_install_all
1156 headers_install_all:
1157         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1158
1159 PHONY += headers_install
1160 headers_install: __headers
1161         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1162           $(error Headers not exportable for the $(SRCARCH) architecture))
1163         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1164         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1165
1166 PHONY += headers_check_all
1167 headers_check_all: headers_install_all
1168         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1169
1170 PHONY += headers_check
1171 headers_check: headers_install
1172         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1173         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1174
1175 # ---------------------------------------------------------------------------
1176 # Kernel selftest
1177
1178 PHONY += kselftest
1179 kselftest:
1180         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1181
1182 PHONY += kselftest-clean
1183 kselftest-clean:
1184         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1185
1186 PHONY += kselftest-merge
1187 kselftest-merge:
1188         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1189         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1190                 -m $(objtree)/.config \
1191                 $(srctree)/tools/testing/selftests/*/config
1192         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1193
1194 # ---------------------------------------------------------------------------
1195 # Modules
1196
1197 ifdef CONFIG_MODULES
1198
1199 # By default, build modules as well
1200
1201 all: modules
1202
1203 # Build modules
1204 #
1205 # A module can be listed more than once in obj-m resulting in
1206 # duplicate lines in modules.order files.  Those are removed
1207 # using awk while concatenating to the final file.
1208
1209 PHONY += modules
1210 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1211         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1212         @$(kecho) '  Building modules, stage 2.';
1213         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1214
1215 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1216         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1217
1218 %/modules.builtin: include/config/auto.conf
1219         $(Q)$(MAKE) $(modbuiltin)=$*
1220
1221
1222 # Target to prepare building external modules
1223 PHONY += modules_prepare
1224 modules_prepare: prepare scripts
1225
1226 # Target to install modules
1227 PHONY += modules_install
1228 modules_install: _modinst_ _modinst_post
1229
1230 PHONY += _modinst_
1231 _modinst_:
1232         @rm -rf $(MODLIB)/kernel
1233         @rm -f $(MODLIB)/source
1234         @mkdir -p $(MODLIB)/kernel
1235         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1236         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1237                 rm -f $(MODLIB)/build ; \
1238                 ln -s $(CURDIR) $(MODLIB)/build ; \
1239         fi
1240         @cp -f $(objtree)/modules.order $(MODLIB)/
1241         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1242         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1243
1244 # This depmod is only for convenience to give the initial
1245 # boot a modules.dep even before / is mounted read-write.  However the
1246 # boot script depmod is the master version.
1247 PHONY += _modinst_post
1248 _modinst_post: _modinst_
1249         $(call cmd,depmod)
1250
1251 ifeq ($(CONFIG_MODULE_SIG), y)
1252 PHONY += modules_sign
1253 modules_sign:
1254         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1255 endif
1256
1257 else # CONFIG_MODULES
1258
1259 # Modules not configured
1260 # ---------------------------------------------------------------------------
1261
1262 PHONY += modules modules_install
1263 modules modules_install:
1264         @echo >&2
1265         @echo >&2 "The present kernel configuration has modules disabled."
1266         @echo >&2 "Type 'make config' and enable loadable module support."
1267         @echo >&2 "Then build a kernel with module support enabled."
1268         @echo >&2
1269         @exit 1
1270
1271 endif # CONFIG_MODULES
1272
1273 ###
1274 # Cleaning is done on three levels.
1275 # make clean     Delete most generated files
1276 #                Leave enough to build external modules
1277 # make mrproper  Delete the current configuration, and all generated files
1278 # make distclean Remove editor backup files, patch leftover files and the like
1279
1280 # Directories & files removed with 'make clean'
1281 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1282
1283 # Directories & files removed with 'make mrproper'
1284 MRPROPER_DIRS  += include/config usr/include include/generated          \
1285                   arch/*/include/generated .tmp_objdiff
1286 MRPROPER_FILES += .config .config.old .version \
1287                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1288                   signing_key.pem signing_key.priv signing_key.x509     \
1289                   x509.genkey extra_certificates signing_key.x509.keyid \
1290                   signing_key.x509.signer vmlinux-gdb.py
1291
1292 # clean - Delete most, but leave enough to build external modules
1293 #
1294 clean: rm-dirs  := $(CLEAN_DIRS)
1295 clean: rm-files := $(CLEAN_FILES)
1296 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1297
1298 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1299 $(clean-dirs):
1300         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1301
1302 vmlinuxclean:
1303         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1304         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1305
1306 clean: archclean vmlinuxclean
1307
1308 # mrproper - Delete all generated files, including .config
1309 #
1310 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1311 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1312 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1313
1314 PHONY += $(mrproper-dirs) mrproper archmrproper
1315 $(mrproper-dirs):
1316         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1317
1318 mrproper: clean archmrproper $(mrproper-dirs)
1319         $(call cmd,rmdirs)
1320         $(call cmd,rmfiles)
1321
1322 # distclean
1323 #
1324 PHONY += distclean
1325
1326 distclean: mrproper
1327         @find $(srctree) $(RCS_FIND_IGNORE) \
1328                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1329                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1330                 -o -name 'core' \) \
1331                 -type f -print | xargs rm -f
1332
1333
1334 # Packaging of the kernel to various formats
1335 # ---------------------------------------------------------------------------
1336 # rpm target kept for backward compatibility
1337 package-dir     := scripts/package
1338
1339 %src-pkg: FORCE
1340         $(Q)$(MAKE) $(build)=$(package-dir) $@
1341 %pkg: include/config/kernel.release FORCE
1342         $(Q)$(MAKE) $(build)=$(package-dir) $@
1343 rpm: rpm-pkg
1344         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1345         @echo "           Please use \"rpm-pkg\" instead."
1346
1347
1348 # Brief documentation of the typical targets used
1349 # ---------------------------------------------------------------------------
1350
1351 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1352 boards := $(sort $(notdir $(boards)))
1353 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1354 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1355
1356 PHONY += help
1357 help:
1358         @echo  'Cleaning targets:'
1359         @echo  '  clean           - Remove most generated files but keep the config and'
1360         @echo  '                    enough build support to build external modules'
1361         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1362         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1363         @echo  ''
1364         @echo  'Configuration targets:'
1365         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1366         @echo  ''
1367         @echo  'Other generic targets:'
1368         @echo  '  all             - Build all targets marked with [*]'
1369         @echo  '* vmlinux         - Build the bare kernel'
1370         @echo  '* modules         - Build all modules'
1371         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1372         @echo  '  dir/            - Build all files in dir and below'
1373         @echo  '  dir/file.[ois]  - Build specified target only'
1374         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1375         @echo  '                    (requires compiler support for LLVM assembly generation)'
1376         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1377         @echo  '                    (requires a recent binutils and recent build (System.map))'
1378         @echo  '  dir/file.ko     - Build module including final link'
1379         @echo  '  modules_prepare - Set up for building external modules'
1380         @echo  '  tags/TAGS       - Generate tags file for editors'
1381         @echo  '  cscope          - Generate cscope index'
1382         @echo  '  gtags           - Generate GNU GLOBAL index'
1383         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1384         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1385         @echo  '  image_name      - Output the image name (use with make -s)'
1386         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1387          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1388          echo  ''
1389         @echo  'Static analysers:'
1390         @echo  '  checkstack      - Generate a list of stack hogs'
1391         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1392         @echo  '  versioncheck    - Sanity check on version.h usage'
1393         @echo  '  includecheck    - Check for duplicate included header files'
1394         @echo  '  export_report   - List the usages of all exported symbols'
1395         @echo  '  headers_check   - Sanity check on exported headers'
1396         @echo  '  headerdep       - Detect inclusion cycles in headers'
1397         @echo  '  coccicheck      - Check with Coccinelle'
1398         @echo  ''
1399         @echo  'Kernel selftest:'
1400         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1401         @echo  '                    Build, install, and boot kernel before'
1402         @echo  '                    running kselftest on it'
1403         @echo  '  kselftest-clean - Remove all generated kselftest files'
1404         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1405         @echo  '                    .config.'
1406         @echo  ''
1407         @echo 'Userspace tools targets:'
1408         @echo '  use "make tools/help"'
1409         @echo '  or  "cd tools; make help"'
1410         @echo  ''
1411         @echo  'Kernel packaging:'
1412         @$(MAKE) $(build)=$(package-dir) help
1413         @echo  ''
1414         @echo  'Documentation targets:'
1415         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1416         @echo  ''
1417         @echo  'Architecture specific targets ($(SRCARCH)):'
1418         @$(if $(archhelp),$(archhelp),\
1419                 echo '  No architecture specific help defined for $(SRCARCH)')
1420         @echo  ''
1421         @$(if $(boards), \
1422                 $(foreach b, $(boards), \
1423                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1424                 echo '')
1425         @$(if $(board-dirs), \
1426                 $(foreach b, $(board-dirs), \
1427                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1428                 printf "  %-16s - Show all of the above\\n" help-boards; \
1429                 echo '')
1430
1431         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1432         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1433         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1434         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1435         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1436         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1437         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1438         @echo  '                1: warnings which may be relevant and do not occur too often'
1439         @echo  '                2: warnings which occur quite often but may still be relevant'
1440         @echo  '                3: more obscure warnings, can most likely be ignored'
1441         @echo  '                Multiple levels can be combined with W=12 or W=123'
1442         @echo  ''
1443         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1444         @echo  'For further info see the ./README file'
1445
1446
1447 help-board-dirs := $(addprefix help-,$(board-dirs))
1448
1449 help-boards: $(help-board-dirs)
1450
1451 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1452
1453 $(help-board-dirs): help-%:
1454         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1455         @$(if $(boards-per-dir), \
1456                 $(foreach b, $(boards-per-dir), \
1457                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1458                 echo '')
1459
1460
1461 # Documentation targets
1462 # ---------------------------------------------------------------------------
1463 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1464                linkcheckdocs dochelp refcheckdocs
1465 PHONY += $(DOC_TARGETS)
1466 $(DOC_TARGETS): scripts_basic FORCE
1467         $(Q)$(MAKE) $(build)=Documentation $@
1468
1469 else # KBUILD_EXTMOD
1470
1471 ###
1472 # External module support.
1473 # When building external modules the kernel used as basis is considered
1474 # read-only, and no consistency checks are made and the make
1475 # system is not used on the basis kernel. If updates are required
1476 # in the basis kernel ordinary make commands (without M=...) must
1477 # be used.
1478 #
1479 # The following are the only valid targets when building external
1480 # modules.
1481 # make M=dir clean     Delete all automatically generated files
1482 # make M=dir modules   Make all modules in specified dir
1483 # make M=dir           Same as 'make M=dir modules'
1484 # make M=dir modules_install
1485 #                      Install the modules built in the module directory
1486 #                      Assumes install directory is already created
1487
1488 # We are always building modules
1489 KBUILD_MODULES := 1
1490 PHONY += crmodverdir
1491 crmodverdir:
1492         $(cmd_crmodverdir)
1493
1494 PHONY += $(objtree)/Module.symvers
1495 $(objtree)/Module.symvers:
1496         @test -e $(objtree)/Module.symvers || ( \
1497         echo; \
1498         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1499         echo "           is missing; modules will have no dependencies and modversions."; \
1500         echo )
1501
1502 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1503 PHONY += $(module-dirs) modules
1504 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1505         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1506
1507 modules: $(module-dirs)
1508         @$(kecho) '  Building modules, stage 2.';
1509         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1510
1511 PHONY += modules_install
1512 modules_install: _emodinst_ _emodinst_post
1513
1514 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1515 PHONY += _emodinst_
1516 _emodinst_:
1517         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1518         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1519
1520 PHONY += _emodinst_post
1521 _emodinst_post: _emodinst_
1522         $(call cmd,depmod)
1523
1524 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1525
1526 PHONY += $(clean-dirs) clean
1527 $(clean-dirs):
1528         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1529
1530 clean:  rm-dirs := $(MODVERDIR)
1531 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1532
1533 PHONY += help
1534 help:
1535         @echo  '  Building external modules.'
1536         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1537         @echo  ''
1538         @echo  '  modules         - default target, build the module(s)'
1539         @echo  '  modules_install - install the module'
1540         @echo  '  clean           - remove generated files in module directory only'
1541         @echo  ''
1542
1543 # Dummies...
1544 PHONY += prepare scripts
1545 prepare: ;
1546 scripts: ;
1547 endif # KBUILD_EXTMOD
1548
1549 clean: $(clean-dirs)
1550         $(call cmd,rmdirs)
1551         $(call cmd,rmfiles)
1552         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1553                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1554                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1555                 -o -name '*.dwo' -o -name '*.lst' \
1556                 -o -name '*.su'  \
1557                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1558                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1559                 -o -name '*.asn1.[ch]' \
1560                 -o -name '*.symtypes' -o -name 'modules.order' \
1561                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1562                 -o -name '*.c.[012]*.*' \
1563                 -o -name '*.ll' \
1564                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1565
1566 # Generate tags for editors
1567 # ---------------------------------------------------------------------------
1568 quiet_cmd_tags = GEN     $@
1569       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1570
1571 tags TAGS cscope gtags: FORCE
1572         $(call cmd,tags)
1573
1574 # Scripts to check various things for consistency
1575 # ---------------------------------------------------------------------------
1576
1577 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1578
1579 includecheck:
1580         find $(srctree)/* $(RCS_FIND_IGNORE) \
1581                 -name '*.[hcS]' -type f -print | sort \
1582                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1583
1584 versioncheck:
1585         find $(srctree)/* $(RCS_FIND_IGNORE) \
1586                 -name '*.[hcS]' -type f -print | sort \
1587                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1588
1589 coccicheck:
1590         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1591
1592 namespacecheck:
1593         $(PERL) $(srctree)/scripts/namespace.pl
1594
1595 export_report:
1596         $(PERL) $(srctree)/scripts/export_report.pl
1597
1598 endif #ifeq ($(config-targets),1)
1599 endif #ifeq ($(mixed-targets),1)
1600
1601 PHONY += checkstack kernelrelease kernelversion image_name
1602
1603 # UML needs a little special treatment here.  It wants to use the host
1604 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1605 # else wants $(ARCH), including people doing cross-builds, which means
1606 # that $(SUBARCH) doesn't work here.
1607 ifeq ($(ARCH), um)
1608 CHECKSTACK_ARCH := $(SUBARCH)
1609 else
1610 CHECKSTACK_ARCH := $(ARCH)
1611 endif
1612 checkstack:
1613         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1614         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1615
1616 kernelrelease:
1617         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1618
1619 kernelversion:
1620         @echo $(KERNELVERSION)
1621
1622 image_name:
1623         @echo $(KBUILD_IMAGE)
1624
1625 # Clear a bunch of variables before executing the submake
1626 tools/: FORCE
1627         $(Q)mkdir -p $(objtree)/tools
1628         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1629
1630 tools/%: FORCE
1631         $(Q)mkdir -p $(objtree)/tools
1632         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1633
1634 # Single targets
1635 # ---------------------------------------------------------------------------
1636 # Single targets are compatible with:
1637 # - build with mixed source and output
1638 # - build with separate output dir 'make O=...'
1639 # - external modules
1640 #
1641 #  target-dir => where to store outputfile
1642 #  build-dir  => directory in kernel source tree to use
1643
1644 ifeq ($(KBUILD_EXTMOD),)
1645         build-dir  = $(patsubst %/,%,$(dir $@))
1646         target-dir = $(dir $@)
1647 else
1648         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1649         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1650         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1651 endif
1652
1653 %.s: %.c prepare scripts FORCE
1654         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1655 %.i: %.c prepare scripts FORCE
1656         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1657 %.o: %.c prepare scripts FORCE
1658         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1659 %.lst: %.c prepare scripts FORCE
1660         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1661 %.s: %.S prepare scripts FORCE
1662         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1663 %.o: %.S prepare scripts FORCE
1664         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1665 %.symtypes: %.c prepare scripts FORCE
1666         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1667 %.ll: %.c prepare scripts FORCE
1668         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1669
1670 # Modules
1671 /: prepare scripts FORCE
1672         $(cmd_crmodverdir)
1673         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1674         $(build)=$(build-dir)
1675 # Make sure the latest headers are built for Documentation
1676 Documentation/ samples/: headers_install
1677 %/: prepare scripts FORCE
1678         $(cmd_crmodverdir)
1679         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1680         $(build)=$(build-dir)
1681 %.ko: prepare scripts FORCE
1682         $(cmd_crmodverdir)
1683         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1684         $(build)=$(build-dir) $(@:.ko=.o)
1685         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1686
1687 # FIXME Should go into a make.lib or something
1688 # ===========================================================================
1689
1690 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1691       cmd_rmdirs = rm -rf $(rm-dirs)
1692
1693 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1694       cmd_rmfiles = rm -f $(rm-files)
1695
1696 # Run depmod only if we have System.map and depmod is executable
1697 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1698       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1699                    $(KERNELRELEASE)
1700
1701 # Create temporary dir for module support files
1702 # clean it up only when building all modules
1703 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1704                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1705
1706 # read all saved command lines
1707
1708 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1709
1710 ifneq ($(cmd_files),)
1711   $(cmd_files): ;       # Do not try to update included dependency files
1712   include $(cmd_files)
1713 endif
1714
1715 endif   # skip-makefile
1716
1717 PHONY += FORCE
1718 FORCE:
1719
1720 # Declare the contents of the PHONY variable as phony.  We keep that
1721 # information in a variable so we can use it in if_changed and friends.
1722 .PHONY: $(PHONY)