Makefile

   1 VERSION = 4
   2 PATCHLEVEL = 5
   3 SUBLEVEL = 0
   4 EXTRAVERSION = -rc6
   5 NAME = Blurry Fish Butt
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # o Do not use make's built-in rules and variables
  14 #   (this increases performance and avoids hard-to-debug behaviour);
  15 # o Look for make include files relative to root of kernel src
  16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18 # Avoid funny character set dependencies
  19 unexport LC_ALL
  20 LC_COLLATE=C
  21 LC_NUMERIC=C
  22 export LC_COLLATE LC_NUMERIC
  23
  24 # Avoid interference with shell env settings
  25 unexport GREP_OPTIONS
  26
  27 # We are using a recursive build, so we need to do a little thinking
  28 # to get the ordering right.
  29 #
  30 # Most importantly: sub-Makefiles should only ever modify files in
  31 # their own directory. If in some directory we have a dependency on
  32 # a file in another dir (which doesn't happen often, but it's often
  33 # unavoidable when linking the built-in.o targets which finally
  34 # turn into vmlinux), we will call a sub make in that other dir, and
  35 # after that we are sure that everything which is in that other dir
  36 # is now up to date.
  37 #
  38 # The only cases where we need to modify files which have global
  39 # effects are thus separated out and done before the recursive
  40 # descending is started. They are now explicitly listed as the
  41 # prepare rule.
  42
  43 # Beautify output
  44 # ---------------------------------------------------------------------------
  45 #
  46 # Normally, we echo the whole command before executing it. By making
  47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  48 # $(quiet) to choose other forms of output instead, e.g.
  49 #
  50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52 #
  53 # If $(quiet) is empty, the whole command will be printed.
  54 # If it is set to "quiet_", only the short version will be printed.
  55 # If it is set to "silent_", nothing will be printed at all, since
  56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  57 #
  58 # A simple variant is to prefix commands with $(Q) - that's useful
  59 # for commands that shall be hidden in non-verbose mode.
  60 #
  61 #       $(Q)ln $@ :<
  62 #
  63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65 #
  66 # To put more focus on warnings, be less verbose as default
  67 # Use 'make V=1' to see the full commands
  68
  69 ifeq ("$(origin V)", "command line")
  70   KBUILD_VERBOSE = $(V)
  71 endif
  72 ifndef KBUILD_VERBOSE
  73   KBUILD_VERBOSE = 0
  74 endif
  75
  76 ifeq ($(KBUILD_VERBOSE),1)
  77   quiet =
  78   Q =
  79 else
  80   quiet=quiet_
  81   Q = @
  82 endif
  83
  84 # If the user is running make -s (silent mode), suppress echoing of
  85 # commands
  86
  87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89   quiet=silent_
  90 endif
  91 else                                    # make-3.8x
  92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  93   quiet=silent_
  94 endif
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # kbuild supports saving output files in a separate directory.
 100 # To locate output files in a separate directory two syntaxes are supported.
 101 # In both cases the working directory must be the root of the kernel src.
 102 # 1) O=
 103 # Use "make O=dir/to/store/output/files/"
 104 #
 105 # 2) Set KBUILD_OUTPUT
 106 # Set the environment variable KBUILD_OUTPUT to point to the directory
 107 # where the output files shall be placed.
 108 # export KBUILD_OUTPUT=dir/to/store/output/files/
 109 # make
 110 #
 111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112 # variable.
 113
 114 # KBUILD_SRC is set on invocation of make in OBJ directory
 115 # KBUILD_SRC is not intended to be used by the regular user (for now)
 116 ifeq ($(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 # That's our default target when none is given on the command line
 125 PHONY := _all
 126 _all:
 127
 128 # Cancel implicit rules on top Makefile
 129 $(CURDIR)/Makefile Makefile: ;
 130
 131 ifneq ($(KBUILD_OUTPUT),)
 132 # Invoke a second make in the output directory, passing relevant variables
 133 # check that the output directory actually exists
 134 saved-output := $(KBUILD_OUTPUT)
 135 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 136                                                                 && /bin/pwd)
 137 $(if $(KBUILD_OUTPUT),, \
 138      $(error failed to create output directory "$(saved-output)"))
 139
 140 PHONY += $(MAKECMDGOALS) sub-make
 141
 142 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 143         @:
 144
 145 sub-make: FORCE
 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 ($(skip-makefile),)
 156
 157 # Do not print "Entering directory ...",
 158 # but we want to display it when entering to the output directory
 159 # so that IDEs/editors are able to understand relative filenames.
 160 MAKEFLAGS += --no-print-directory
 161
 162 # Call a source code checker (by default, "sparse") as part of the
 163 # C compilation.
 164 #
 165 # Use 'make C=1' to enable checking of only re-compiled files.
 166 # Use 'make C=2' to enable checking of *all* source files, regardless
 167 # of whether they are re-compiled or not.
 168 #
 169 # See the file "Documentation/sparse.txt" for more details, including
 170 # where to get the "sparse" utility.
 171
 172 ifeq ("$(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 := $(M)
 188 endif
 189
 190 # If building an external module we do not care about the all: rule
 191 # but instead _all depend on modules
 192 PHONY += all
 193 ifeq ($(KBUILD_EXTMOD),)
 194 _all: all
 195 else
 196 _all: modules
 197 endif
 198
 199 ifeq ($(KBUILD_SRC),)
 200         # building in the source tree
 201         srctree := .
 202 else
 203         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 204                 # building in a subdirectory of the source tree
 205                 srctree := ..
 206         else
 207                 srctree := $(KBUILD_SRC)
 208         endif
 209 endif
 210 objtree         := .
 211 src             := $(srctree)
 212 obj             := $(objtree)
 213
 214 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 215
 216 export srctree objtree VPATH
 217
 218 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 219 # first, and if a usermode build is happening, the "ARCH=um" on the command
 220 # line overrides the setting of ARCH below.  If a native build is happening,
 221 # then ARCH is assigned, getting whatever value it gets normally, and
 222 # SUBARCH is subsequently ignored.
 223
 224 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 225                                   -e s/sun4u/sparc64/ \
 226                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 227                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 228                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 229                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 230
 231 # Cross compiling and selecting different set of gcc/bin-utils
 232 # ---------------------------------------------------------------------------
 233 #
 234 # When performing cross compilation for other architectures ARCH shall be set
 235 # to the target architecture. (See arch/* for the possibilities).
 236 # ARCH can be set during invocation of make:
 237 # make ARCH=ia64
 238 # Another way is to have ARCH set in the environment.
 239 # The default ARCH is the host where make is executed.
 240
 241 # CROSS_COMPILE specify the prefix used for all executables used
 242 # during compilation. Only gcc and related bin-utils executables
 243 # are prefixed with $(CROSS_COMPILE).
 244 # CROSS_COMPILE can be set on the command line
 245 # make CROSS_COMPILE=ia64-linux-
 246 # Alternatively CROSS_COMPILE can be set in the environment.
 247 # A third alternative is to store a setting in .config so that plain
 248 # "make" in the configured kernel build directory always uses that.
 249 # Default value for CROSS_COMPILE is not to prefix executables
 250 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 251 ARCH            ?= $(SUBARCH)
 252 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 253
 254 # Architecture as present in compile.h
 255 UTS_MACHINE     := $(ARCH)
 256 SRCARCH         := $(ARCH)
 257
 258 # Additional ARCH settings for x86
 259 ifeq ($(ARCH),i386)
 260         SRCARCH := x86
 261 endif
 262 ifeq ($(ARCH),x86_64)
 263         SRCARCH := x86
 264 endif
 265
 266 # Additional ARCH settings for sparc
 267 ifeq ($(ARCH),sparc32)
 268        SRCARCH := sparc
 269 endif
 270 ifeq ($(ARCH),sparc64)
 271        SRCARCH := sparc
 272 endif
 273
 274 # Additional ARCH settings for sh
 275 ifeq ($(ARCH),sh64)
 276        SRCARCH := sh
 277 endif
 278
 279 # Additional ARCH settings for tile
 280 ifeq ($(ARCH),tilepro)
 281        SRCARCH := tile
 282 endif
 283 ifeq ($(ARCH),tilegx)
 284        SRCARCH := tile
 285 endif
 286
 287 # Where to locate arch specific headers
 288 hdr-arch  := $(SRCARCH)
 289
 290 KCONFIG_CONFIG  ?= .config
 291 export KCONFIG_CONFIG
 292
 293 # SHELL used by kbuild
 294 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 295           else if [ -x /bin/bash ]; then echo /bin/bash; \
 296           else echo sh; fi ; fi)
 297
 298 HOSTCC       = gcc
 299 HOSTCXX      = g++
 300 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 301 HOSTCXXFLAGS = -O2
 302
 303 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 304 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 305                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 306 endif
 307
 308 # Decide whether to build built-in, modular, or both.
 309 # Normally, just do built-in.
 310
 311 KBUILD_MODULES :=
 312 KBUILD_BUILTIN := 1
 313
 314 # If we have only "make modules", don't compile built-in objects.
 315 # When we're building modules with modversions, we need to consider
 316 # the built-in objects during the descend as well, in order to
 317 # make sure the checksums are up to date before we record them.
 318
 319 ifeq ($(MAKECMDGOALS),modules)
 320   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 321 endif
 322
 323 # If we have "make <whatever> modules", compile modules
 324 # in addition to whatever we do anyway.
 325 # Just "make" or "make all" shall build modules as well
 326
 327 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 328   KBUILD_MODULES := 1
 329 endif
 330
 331 ifeq ($(MAKECMDGOALS),)
 332   KBUILD_MODULES := 1
 333 endif
 334
 335 export KBUILD_MODULES KBUILD_BUILTIN
 336 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 337
 338 # We need some generic definitions (do not try to remake the file).
 339 scripts/Kbuild.include: ;
 340 include scripts/Kbuild.include
 341
 342 # Make variables (CC, etc...)
 343 AS              = $(CROSS_COMPILE)as
 344 LD              = $(CROSS_COMPILE)ld
 345 CC              = $(CROSS_COMPILE)gcc
 346 CPP             = $(CC) -E
 347 AR              = $(CROSS_COMPILE)ar
 348 NM              = $(CROSS_COMPILE)nm
 349 STRIP           = $(CROSS_COMPILE)strip
 350 OBJCOPY         = $(CROSS_COMPILE)objcopy
 351 OBJDUMP         = $(CROSS_COMPILE)objdump
 352 AWK             = awk
 353 GENKSYMS        = scripts/genksyms/genksyms
 354 INSTALLKERNEL  := installkernel
 355 DEPMOD          = /sbin/depmod
 356 PERL            = perl
 357 PYTHON          = python
 358 CHECK           = sparse
 359
 360 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 361                   -Wbitwise -Wno-return-void $(CF)
 362 CFLAGS_MODULE   =
 363 AFLAGS_MODULE   =
 364 LDFLAGS_MODULE  =
 365 CFLAGS_KERNEL   =
 366 AFLAGS_KERNEL   =
 367 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 368
 369
 370 # Use USERINCLUDE when you must reference the UAPI directories only.
 371 USERINCLUDE    := \
 372                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 373                 -Iarch/$(hdr-arch)/include/generated/uapi \
 374                 -I$(srctree)/include/uapi \
 375                 -Iinclude/generated/uapi \
 376                 -include $(srctree)/include/linux/kconfig.h
 377
 378 # Use LINUXINCLUDE when you must reference the include/ directory.
 379 # Needed to be compatible with the O= option
 380 LINUXINCLUDE    := \
 381                 -I$(srctree)/arch/$(hdr-arch)/include \
 382                 -Iarch/$(hdr-arch)/include/generated/uapi \
 383                 -Iarch/$(hdr-arch)/include/generated \
 384                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
 385                 -Iinclude \
 386                 $(USERINCLUDE)
 387
 388 KBUILD_CPPFLAGS := -D__KERNEL__
 389
 390 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 391                    -fno-strict-aliasing -fno-common \
 392                    -Werror-implicit-function-declaration \
 393                    -Wno-format-security \
 394                    -std=gnu89
 395
 396 KBUILD_AFLAGS_KERNEL :=
 397 KBUILD_CFLAGS_KERNEL :=
 398 KBUILD_AFLAGS   := -D__ASSEMBLY__
 399 KBUILD_AFLAGS_MODULE  := -DMODULE
 400 KBUILD_CFLAGS_MODULE  := -DMODULE
 401 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 402
 403 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 404 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 405 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 406
 407 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 408 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 409 export CPP AR NM STRIP OBJCOPY OBJDUMP
 410 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 411 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 412
 413 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 414 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN CFLAGS_UBSAN
 415 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 416 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 417 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 418 export KBUILD_ARFLAGS
 419
 420 # When compiling out-of-tree modules, put MODVERDIR in the module
 421 # tree rather than in the kernel tree. The kernel tree might
 422 # even be read-only.
 423 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 424
 425 # Files to ignore in find ... statements
 426
 427 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 428                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 429                           -prune -o
 430 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 431                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 432
 433 # ===========================================================================
 434 # Rules shared between *config targets and build targets
 435
 436 # Basic helpers built in scripts/
 437 PHONY += scripts_basic
 438 scripts_basic:
 439         $(Q)$(MAKE) $(build)=scripts/basic
 440         $(Q)rm -f .tmp_quiet_recordmcount
 441
 442 # To avoid any implicit rule to kick in, define an empty command.
 443 scripts/basic/%: scripts_basic ;
 444
 445 PHONY += outputmakefile
 446 # outputmakefile generates a Makefile in the output directory, if using a
 447 # separate output directory. This allows convenient use of make in the
 448 # output directory.
 449 outputmakefile:
 450 ifneq ($(KBUILD_SRC),)
 451         $(Q)ln -fsn $(srctree) source
 452         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 453             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 454 endif
 455
 456 # Support for using generic headers in asm-generic
 457 PHONY += asm-generic
 458 asm-generic:
 459         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 460                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
 461         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 462                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 463
 464 # To make sure we do not include .config for any of the *config targets
 465 # catch them early, and hand them over to scripts/kconfig/Makefile
 466 # It is allowed to specify more targets when calling make, including
 467 # mixing *config targets and build targets.
 468 # For example 'make oldconfig all'.
 469 # Detect when mixed targets is specified, and make a second invocation
 470 # of make so .config is not included in this case either (for *config).
 471
 472 version_h := include/generated/uapi/linux/version.h
 473 old_version_h := include/linux/version.h
 474
 475 no-dot-config-targets := clean mrproper distclean \
 476                          cscope gtags TAGS tags help% %docs check% coccicheck \
 477                          $(version_h) headers_% archheaders archscripts \
 478                          kernelversion %src-pkg
 479
 480 config-targets := 0
 481 mixed-targets  := 0
 482 dot-config     := 1
 483
 484 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 485         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 486                 dot-config := 0
 487         endif
 488 endif
 489
 490 ifeq ($(KBUILD_EXTMOD),)
 491         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 492                 config-targets := 1
 493                 ifneq ($(words $(MAKECMDGOALS)),1)
 494                         mixed-targets := 1
 495                 endif
 496         endif
 497 endif
 498 # install and module_install need also be processed one by one
 499 ifneq ($(filter install,$(MAKECMDGOALS)),)
 500         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 501                 mixed-targets := 1
 502         endif
 503 endif
 504
 505 ifeq ($(mixed-targets),1)
 506 # ===========================================================================
 507 # We're called with mixed targets (*config and build targets).
 508 # Handle them one by one.
 509
 510 PHONY += $(MAKECMDGOALS) __build_one_by_one
 511
 512 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 513         @:
 514
 515 __build_one_by_one:
 516         $(Q)set -e; \
 517         for i in $(MAKECMDGOALS); do \
 518                 $(MAKE) -f $(srctree)/Makefile $$i; \
 519         done
 520
 521 else
 522 ifeq ($(config-targets),1)
 523 # ===========================================================================
 524 # *config targets only - make sure prerequisites are updated, and descend
 525 # in scripts/kconfig to make the *config target
 526
 527 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 528 # KBUILD_DEFCONFIG may point out an alternative default configuration
 529 # used for 'make defconfig'
 530 include arch/$(SRCARCH)/Makefile
 531 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 532
 533 config: scripts_basic outputmakefile FORCE
 534         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 535
 536 %config: scripts_basic outputmakefile FORCE
 537         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 538
 539 else
 540 # ===========================================================================
 541 # Build targets only - this includes vmlinux, arch specific targets, clean
 542 # targets and others. In general all targets except *config targets.
 543
 544 ifeq ($(KBUILD_EXTMOD),)
 545 # Additional helpers built in scripts/
 546 # Carefully list dependencies so we do not try to build scripts twice
 547 # in parallel
 548 PHONY += scripts
 549 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 550          asm-generic
 551         $(Q)$(MAKE) $(build)=$(@)
 552
 553 # Objects we will link into vmlinux / subdirs we need to visit
 554 init-y          := init/
 555 drivers-y       := drivers/ sound/ firmware/
 556 net-y           := net/
 557 libs-y          := lib/
 558 core-y          := usr/
 559 virt-y          := virt/
 560 endif # KBUILD_EXTMOD
 561
 562 ifeq ($(dot-config),1)
 563 # Read in config
 564 -include include/config/auto.conf
 565
 566 ifeq ($(KBUILD_EXTMOD),)
 567 # Read in dependencies to all Kconfig* files, make sure to run
 568 # oldconfig if changes are detected.
 569 -include include/config/auto.conf.cmd
 570
 571 # To avoid any implicit rule to kick in, define an empty command
 572 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 573
 574 # If .config is newer than include/config/auto.conf, someone tinkered
 575 # with it and forgot to run make oldconfig.
 576 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 577 # we execute the config step to be sure to catch updated Kconfig files
 578 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 579         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 580 else
 581 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 582 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 583 PHONY += include/config/auto.conf
 584
 585 include/config/auto.conf:
 586         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 587         echo >&2;                                                       \
 588         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 589         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 590         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 591         echo >&2 ;                                                      \
 592         /bin/false)
 593
 594 endif # KBUILD_EXTMOD
 595
 596 else
 597 # Dummy target needed, because used as prerequisite
 598 include/config/auto.conf: ;
 599 endif # $(dot-config)
 600
 601 # The all: target is the default when no target is given on the
 602 # command line.
 603 # This allow a user to issue only 'make' to build a kernel including modules
 604 # Defaults to vmlinux, but the arch makefile usually adds further targets
 605 all: vmlinux
 606
 607 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 608 # values of the respective KBUILD_* variables
 609 ARCH_CPPFLAGS :=
 610 ARCH_AFLAGS :=
 611 ARCH_CFLAGS :=
 612 include arch/$(SRCARCH)/Makefile
 613
 614 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 615
 616 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 617 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 618 else
 619 KBUILD_CFLAGS   += -O2
 620 endif
 621
 622 # Tell gcc to never replace conditional load with a non-conditional one
 623 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 624
 625 ifdef CONFIG_READABLE_ASM
 626 # Disable optimizations that make assembler listings hard to read.
 627 # reorder blocks reorders the control in the function
 628 # ipa clone creates specialized cloned functions
 629 # partial inlining inlines only parts of functions
 630 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 631                  $(call cc-option,-fno-ipa-cp-clone,) \
 632                  $(call cc-option,-fno-partial-inlining)
 633 endif
 634
 635 ifneq ($(CONFIG_FRAME_WARN),0)
 636 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 637 endif
 638
 639 # Handle stack protector mode.
 640 #
 641 # Since kbuild can potentially perform two passes (first with the old
 642 # .config values and then with updated .config values), we cannot error out
 643 # if a desired compiler option is unsupported. If we were to error, kbuild
 644 # could never get to the second pass and actually notice that we changed
 645 # the option to something that was supported.
 646 #
 647 # Additionally, we don't want to fallback and/or silently change which compiler
 648 # flags will be used, since that leads to producing kernels with different
 649 # security feature characteristics depending on the compiler used. ("But I
 650 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
 651 #
 652 # The middle ground is to warn here so that the failed option is obvious, but
 653 # to let the build fail with bad compiler flags so that we can't produce a
 654 # kernel when there is a CONFIG and compiler mismatch.
 655 #
 656 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 657   stackp-flag := -fstack-protector
 658   ifeq ($(call cc-option, $(stackp-flag)),)
 659     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
 660              -fstack-protector not supported by compiler)
 661   endif
 662 else
 663 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 664   stackp-flag := -fstack-protector-strong
 665   ifeq ($(call cc-option, $(stackp-flag)),)
 666     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
 667               -fstack-protector-strong not supported by compiler)
 668   endif
 669 else
 670   # Force off for distro compilers that enable stack protector by default.
 671   stackp-flag := $(call cc-option, -fno-stack-protector)
 672 endif
 673 endif
 674 KBUILD_CFLAGS += $(stackp-flag)
 675
 676 ifeq ($(cc-name),clang)
 677 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 678 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 679 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 680 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 681 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 682 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 683 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 684 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 685 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 686 # See modpost pattern 2
 687 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 688 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 689 else
 690
 691 # This warning generated too much noise in a regular build.
 692 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 693 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 694 endif
 695
 696 ifdef CONFIG_FRAME_POINTER
 697 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 698 else
 699 # Some targets (ARM with Thumb2, for example), can't be built with frame
 700 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 701 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 702 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 703 # -fomit-frame-pointer with FUNCTION_TRACER.
 704 ifndef CONFIG_FUNCTION_TRACER
 705 KBUILD_CFLAGS   += -fomit-frame-pointer
 706 endif
 707 endif
 708
 709 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 710
 711 ifdef CONFIG_DEBUG_INFO
 712 ifdef CONFIG_DEBUG_INFO_SPLIT
 713 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 714 else
 715 KBUILD_CFLAGS   += -g
 716 endif
 717 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 718 endif
 719 ifdef CONFIG_DEBUG_INFO_DWARF4
 720 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 721 endif
 722
 723 ifdef CONFIG_DEBUG_INFO_REDUCED
 724 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 725                    $(call cc-option,-fno-var-tracking)
 726 endif
 727
 728 ifdef CONFIG_FUNCTION_TRACER
 729 ifndef CC_FLAGS_FTRACE
 730 CC_FLAGS_FTRACE := -pg
 731 endif
 732 export CC_FLAGS_FTRACE
 733 ifdef CONFIG_HAVE_FENTRY
 734 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 735 endif
 736 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 737 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 738 ifdef CONFIG_DYNAMIC_FTRACE
 739         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 740                 BUILD_C_RECORDMCOUNT := y
 741                 export BUILD_C_RECORDMCOUNT
 742         endif
 743 endif
 744 endif
 745
 746 # We trigger additional mismatches with less inlining
 747 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 748 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 749 endif
 750
 751 # arch Makefile may override CC so keep this after arch Makefile is included
 752 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 753 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 754
 755 # warn about C99 declaration after statement
 756 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 757
 758 # disable pointer signed / unsigned warnings in gcc 4.0
 759 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 760
 761 # disable invalid "can't wrap" optimizations for signed / pointers
 762 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 763
 764 # conserve stack if available
 765 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 766
 767 # disallow errors like 'EXPORT_GPL(foo);' with missing header
 768 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 769
 770 # require functions to have arguments in prototypes, not empty 'int foo()'
 771 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 772
 773 # Prohibit date/time macros, which would make the build non-deterministic
 774 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 775
 776 # use the deterministic mode of AR if available
 777 KBUILD_ARFLAGS := $(call ar-option,D)
 778
 779 # check for 'asm goto'
 780 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 781         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 782         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 783 endif
 784
 785 include scripts/Makefile.kasan
 786 include scripts/Makefile.extrawarn
 787 include scripts/Makefile.ubsan
 788
 789 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 790 # last assignments
 791 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 792 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 793 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 794
 795 # Use --build-id when available.
 796 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 797                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 798 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 799 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 800
 801 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 802 LDFLAGS_vmlinux += $(call ld-option, -X,)
 803 endif
 804
 805 # Default kernel image to build when no specific target is given.
 806 # KBUILD_IMAGE may be overruled on the command line or
 807 # set in the environment
 808 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 809 # this default value
 810 export KBUILD_IMAGE ?= vmlinux
 811
 812 #
 813 # INSTALL_PATH specifies where to place the updated kernel and system map
 814 # images. Default is /boot, but you can set it to other values
 815 export  INSTALL_PATH ?= /boot
 816
 817 #
 818 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 819 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 820 # an argument if needed. Otherwise it defaults to the kernel install path
 821 #
 822 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 823
 824 #
 825 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 826 # relocations required by build roots.  This is not defined in the
 827 # makefile but the argument can be passed to make if needed.
 828 #
 829
 830 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 831 export MODLIB
 832
 833 #
 834 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 835 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 836 # the default option --strip-debug will be used.  Otherwise,
 837 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 838
 839 ifdef INSTALL_MOD_STRIP
 840 ifeq ($(INSTALL_MOD_STRIP),1)
 841 mod_strip_cmd = $(STRIP) --strip-debug
 842 else
 843 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 844 endif # INSTALL_MOD_STRIP=1
 845 else
 846 mod_strip_cmd = true
 847 endif # INSTALL_MOD_STRIP
 848 export mod_strip_cmd
 849
 850 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 851 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 852 # or CONFIG_MODULE_COMPRESS_XZ.
 853
 854 mod_compress_cmd = true
 855 ifdef CONFIG_MODULE_COMPRESS
 856   ifdef CONFIG_MODULE_COMPRESS_GZIP
 857     mod_compress_cmd = gzip -n -f
 858   endif # CONFIG_MODULE_COMPRESS_GZIP
 859   ifdef CONFIG_MODULE_COMPRESS_XZ
 860     mod_compress_cmd = xz -f
 861   endif # CONFIG_MODULE_COMPRESS_XZ
 862 endif # CONFIG_MODULE_COMPRESS
 863 export mod_compress_cmd
 864
 865 # Select initial ramdisk compression format, default is gzip(1).
 866 # This shall be used by the dracut(8) tool while creating an initramfs image.
 867 #
 868 INITRD_COMPRESS-y                  := gzip
 869 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 870 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 871 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 872 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 873 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 874 # do not export INITRD_COMPRESS, since we didn't actually
 875 # choose a sane default compression above.
 876 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 877
 878 ifdef CONFIG_MODULE_SIG_ALL
 879 $(eval $(call config_filename,MODULE_SIG_KEY))
 880
 881 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 882 else
 883 mod_sign_cmd = true
 884 endif
 885 export mod_sign_cmd
 886
 887
 888 ifeq ($(KBUILD_EXTMOD),)
 889 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 890
 891 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 892                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 893                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 894
 895 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 896                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 897
 898 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 899 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 900 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 901 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 902 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 903 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 904 libs-y          := $(libs-y1) $(libs-y2)
 905 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 906
 907 # Externally visible symbols (used by link-vmlinux.sh)
 908 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 909 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 910 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 911 export LDFLAGS_vmlinux
 912 # used by scripts/pacmage/Makefile
 913 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 914
 915 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 916
 917 # Final link of vmlinux
 918       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 919 quiet_cmd_link-vmlinux = LINK    $@
 920
 921 # Include targets which we want to
 922 # execute if the rest of the kernel build went well.
 923 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 924 ifdef CONFIG_HEADERS_CHECK
 925         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 926 endif
 927 ifdef CONFIG_SAMPLES
 928         $(Q)$(MAKE) $(build)=samples
 929 endif
 930 ifdef CONFIG_BUILD_DOCSRC
 931         $(Q)$(MAKE) $(build)=Documentation
 932 endif
 933 ifdef CONFIG_GDB_SCRIPTS
 934         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 935 endif
 936         +$(call if_changed,link-vmlinux)
 937
 938 # The actual objects are generated when descending,
 939 # make sure no implicit rule kicks in
 940 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 941
 942 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 943 # Preset locale variables to speed up the build process. Limit locale
 944 # tweaks to this spot to avoid wrong language settings when running
 945 # make menuconfig etc.
 946 # Error messages still appears in the original language
 947
 948 PHONY += $(vmlinux-dirs)
 949 $(vmlinux-dirs): prepare scripts
 950         $(Q)$(MAKE) $(build)=$@
 951
 952 define filechk_kernel.release
 953         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 954 endef
 955
 956 # Store (new) KERNELRELEASE string in include/config/kernel.release
 957 include/config/kernel.release: include/config/auto.conf FORCE
 958         $(call filechk,kernel.release)
 959
 960
 961 # Things we need to do before we recursively start building the kernel
 962 # or the modules are listed in "prepare".
 963 # A multi level approach is used. prepareN is processed before prepareN-1.
 964 # archprepare is used in arch Makefiles and when processed asm symlink,
 965 # version.h and scripts_basic is processed / created.
 966
 967 # Listed in dependency order
 968 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 969
 970 # prepare3 is used to check if we are building in a separate output directory,
 971 # and if so do:
 972 # 1) Check that make has not been executed in the kernel src $(srctree)
 973 prepare3: include/config/kernel.release
 974 ifneq ($(KBUILD_SRC),)
 975         @$(kecho) '  Using $(srctree) as source for kernel'
 976         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 977                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 978                 echo >&2 "  in the '$(srctree)' directory.";\
 979                 /bin/false; \
 980         fi;
 981 endif
 982
 983 # prepare2 creates a makefile if using a separate output directory
 984 prepare2: prepare3 outputmakefile asm-generic
 985
 986 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 987                    include/config/auto.conf
 988         $(cmd_crmodverdir)
 989
 990 archprepare: archheaders archscripts prepare1 scripts_basic
 991
 992 prepare0: archprepare FORCE
 993         $(Q)$(MAKE) $(build)=.
 994
 995 # All the preparing..
 996 prepare: prepare0
 997
 998 # Generate some files
 999 # ---------------------------------------------------------------------------
1000
1001 # KERNELRELEASE can change from a few different places, meaning version.h
1002 # needs to be updated, so this check is forced on all builds
1003
1004 uts_len := 64
1005 define filechk_utsrelease.h
1006         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1007           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1008           exit 1;                                                         \
1009         fi;                                                               \
1010         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1011 endef
1012
1013 define filechk_version.h
1014         (echo \#define LINUX_VERSION_CODE $(shell                         \
1015         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1016         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1017 endef
1018
1019 $(version_h): $(srctree)/Makefile FORCE
1020         $(call filechk,version.h)
1021         $(Q)rm -f $(old_version_h)
1022
1023 include/generated/utsrelease.h: include/config/kernel.release FORCE
1024         $(call filechk,utsrelease.h)
1025
1026 PHONY += headerdep
1027 headerdep:
1028         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1029         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1030
1031 # ---------------------------------------------------------------------------
1032 # Firmware install
1033 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1034 export INSTALL_FW_PATH
1035
1036 PHONY += firmware_install
1037 firmware_install: FORCE
1038         @mkdir -p $(objtree)/firmware
1039         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1040
1041 # ---------------------------------------------------------------------------
1042 # Kernel headers
1043
1044 #Default location for installed headers
1045 export INSTALL_HDR_PATH = $(objtree)/usr
1046
1047 # If we do an all arch process set dst to asm-$(hdr-arch)
1048 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050 PHONY += archheaders
1051 archheaders:
1052
1053 PHONY += archscripts
1054 archscripts:
1055
1056 PHONY += __headers
1057 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1058         $(Q)$(MAKE) $(build)=scripts build_unifdef
1059
1060 PHONY += headers_install_all
1061 headers_install_all:
1062         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1063
1064 PHONY += headers_install
1065 headers_install: __headers
1066         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1067           $(error Headers not exportable for the $(SRCARCH) architecture))
1068         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1069         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1070
1071 PHONY += headers_check_all
1072 headers_check_all: headers_install_all
1073         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1074
1075 PHONY += headers_check
1076 headers_check: headers_install
1077         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1078         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1079
1080 # ---------------------------------------------------------------------------
1081 # Kernel selftest
1082
1083 PHONY += kselftest
1084 kselftest:
1085         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1086
1087 kselftest-clean:
1088         $(Q)$(MAKE) -C tools/testing/selftests clean
1089
1090 # ---------------------------------------------------------------------------
1091 # Modules
1092
1093 ifdef CONFIG_MODULES
1094
1095 # By default, build modules as well
1096
1097 all: modules
1098
1099 # Build modules
1100 #
1101 # A module can be listed more than once in obj-m resulting in
1102 # duplicate lines in modules.order files.  Those are removed
1103 # using awk while concatenating to the final file.
1104
1105 PHONY += modules
1106 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1107         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1108         @$(kecho) '  Building modules, stage 2.';
1109         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1110         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1111
1112 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1113         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1114
1115 %/modules.builtin: include/config/auto.conf
1116         $(Q)$(MAKE) $(modbuiltin)=$*
1117
1118
1119 # Target to prepare building external modules
1120 PHONY += modules_prepare
1121 modules_prepare: prepare scripts
1122
1123 # Target to install modules
1124 PHONY += modules_install
1125 modules_install: _modinst_ _modinst_post
1126
1127 PHONY += _modinst_
1128 _modinst_:
1129         @rm -rf $(MODLIB)/kernel
1130         @rm -f $(MODLIB)/source
1131         @mkdir -p $(MODLIB)/kernel
1132         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1133         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1134                 rm -f $(MODLIB)/build ; \
1135                 ln -s $(CURDIR) $(MODLIB)/build ; \
1136         fi
1137         @cp -f $(objtree)/modules.order $(MODLIB)/
1138         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1139         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1140
1141 # This depmod is only for convenience to give the initial
1142 # boot a modules.dep even before / is mounted read-write.  However the
1143 # boot script depmod is the master version.
1144 PHONY += _modinst_post
1145 _modinst_post: _modinst_
1146         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1147         $(call cmd,depmod)
1148
1149 ifeq ($(CONFIG_MODULE_SIG), y)
1150 PHONY += modules_sign
1151 modules_sign:
1152         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1153 endif
1154
1155 else # CONFIG_MODULES
1156
1157 # Modules not configured
1158 # ---------------------------------------------------------------------------
1159
1160 modules modules_install: FORCE
1161         @echo >&2
1162         @echo >&2 "The present kernel configuration has modules disabled."
1163         @echo >&2 "Type 'make config' and enable loadable module support."
1164         @echo >&2 "Then build a kernel with module support enabled."
1165         @echo >&2
1166         @exit 1
1167
1168 endif # CONFIG_MODULES
1169
1170 ###
1171 # Cleaning is done on three levels.
1172 # make clean     Delete most generated files
1173 #                Leave enough to build external modules
1174 # make mrproper  Delete the current configuration, and all generated files
1175 # make distclean Remove editor backup files, patch leftover files and the like
1176
1177 # Directories & files removed with 'make clean'
1178 CLEAN_DIRS  += $(MODVERDIR)
1179
1180 # Directories & files removed with 'make mrproper'
1181 MRPROPER_DIRS  += include/config usr/include include/generated          \
1182                   arch/*/include/generated .tmp_objdiff
1183 MRPROPER_FILES += .config .config.old .version .old_version \
1184                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1185                   signing_key.pem signing_key.priv signing_key.x509     \
1186                   x509.genkey extra_certificates signing_key.x509.keyid \
1187                   signing_key.x509.signer vmlinux-gdb.py
1188
1189 # clean - Delete most, but leave enough to build external modules
1190 #
1191 clean: rm-dirs  := $(CLEAN_DIRS)
1192 clean: rm-files := $(CLEAN_FILES)
1193 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1194
1195 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1196 $(clean-dirs):
1197         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1198
1199 vmlinuxclean:
1200         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1201
1202 clean: archclean vmlinuxclean
1203
1204 # mrproper - Delete all generated files, including .config
1205 #
1206 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1207 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1208 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1209
1210 PHONY += $(mrproper-dirs) mrproper archmrproper
1211 $(mrproper-dirs):
1212         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1213
1214 mrproper: clean archmrproper $(mrproper-dirs)
1215         $(call cmd,rmdirs)
1216         $(call cmd,rmfiles)
1217
1218 # distclean
1219 #
1220 PHONY += distclean
1221
1222 distclean: mrproper
1223         @find $(srctree) $(RCS_FIND_IGNORE) \
1224                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1225                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1226                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1227                 -type f -print | xargs rm -f
1228
1229
1230 # Packaging of the kernel to various formats
1231 # ---------------------------------------------------------------------------
1232 # rpm target kept for backward compatibility
1233 package-dir     := scripts/package
1234
1235 %src-pkg: FORCE
1236         $(Q)$(MAKE) $(build)=$(package-dir) $@
1237 %pkg: include/config/kernel.release FORCE
1238         $(Q)$(MAKE) $(build)=$(package-dir) $@
1239 rpm: include/config/kernel.release FORCE
1240         $(Q)$(MAKE) $(build)=$(package-dir) $@
1241
1242
1243 # Brief documentation of the typical targets used
1244 # ---------------------------------------------------------------------------
1245
1246 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1247 boards := $(sort $(notdir $(boards)))
1248 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1249 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1250
1251 help:
1252         @echo  'Cleaning targets:'
1253         @echo  '  clean           - Remove most generated files but keep the config and'
1254         @echo  '                    enough build support to build external modules'
1255         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1256         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1257         @echo  ''
1258         @echo  'Configuration targets:'
1259         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1260         @echo  ''
1261         @echo  'Other generic targets:'
1262         @echo  '  all             - Build all targets marked with [*]'
1263         @echo  '* vmlinux         - Build the bare kernel'
1264         @echo  '* modules         - Build all modules'
1265         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1266         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1267         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1268         @echo  '  dir/            - Build all files in dir and below'
1269         @echo  '  dir/file.[ois]  - Build specified target only'
1270         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1271         @echo  '                    (requires a recent binutils and recent build (System.map))'
1272         @echo  '  dir/file.ko     - Build module including final link'
1273         @echo  '  modules_prepare - Set up for building external modules'
1274         @echo  '  tags/TAGS       - Generate tags file for editors'
1275         @echo  '  cscope          - Generate cscope index'
1276         @echo  '  gtags           - Generate GNU GLOBAL index'
1277         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1278         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1279         @echo  '  image_name      - Output the image name (use with make -s)'
1280         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1281          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1282          echo  ''
1283         @echo  'Static analysers'
1284         @echo  '  checkstack      - Generate a list of stack hogs'
1285         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1286         @echo  '  versioncheck    - Sanity check on version.h usage'
1287         @echo  '  includecheck    - Check for duplicate included header files'
1288         @echo  '  export_report   - List the usages of all exported symbols'
1289         @echo  '  headers_check   - Sanity check on exported headers'
1290         @echo  '  headerdep       - Detect inclusion cycles in headers'
1291         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1292         @echo  ''
1293         @echo  'Kernel selftest'
1294         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1295         @echo  '                    Build, install, and boot kernel before'
1296         @echo  '                    running kselftest on it'
1297         @echo  '  kselftest-clean - Remove all generated kselftest files'
1298         @echo  ''
1299         @echo  'Kernel packaging:'
1300         @$(MAKE) $(build)=$(package-dir) help
1301         @echo  ''
1302         @echo  'Documentation targets:'
1303         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1304         @echo  ''
1305         @echo  'Architecture specific targets ($(SRCARCH)):'
1306         @$(if $(archhelp),$(archhelp),\
1307                 echo '  No architecture specific help defined for $(SRCARCH)')
1308         @echo  ''
1309         @$(if $(boards), \
1310                 $(foreach b, $(boards), \
1311                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1312                 echo '')
1313         @$(if $(board-dirs), \
1314                 $(foreach b, $(board-dirs), \
1315                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1316                 printf "  %-16s - Show all of the above\\n" help-boards; \
1317                 echo '')
1318
1319         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1320         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1321         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1322         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1323         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1324         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1325         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1326         @echo  '                1: warnings which may be relevant and do not occur too often'
1327         @echo  '                2: warnings which occur quite often but may still be relevant'
1328         @echo  '                3: more obscure warnings, can most likely be ignored'
1329         @echo  '                Multiple levels can be combined with W=12 or W=123'
1330         @echo  ''
1331         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1332         @echo  'For further info see the ./README file'
1333
1334
1335 help-board-dirs := $(addprefix help-,$(board-dirs))
1336
1337 help-boards: $(help-board-dirs)
1338
1339 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1340
1341 $(help-board-dirs): help-%:
1342         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1343         @$(if $(boards-per-dir), \
1344                 $(foreach b, $(boards-per-dir), \
1345                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1346                 echo '')
1347
1348
1349 # Documentation targets
1350 # ---------------------------------------------------------------------------
1351 %docs: scripts_basic FORCE
1352         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1353         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1354
1355 else # KBUILD_EXTMOD
1356
1357 ###
1358 # External module support.
1359 # When building external modules the kernel used as basis is considered
1360 # read-only, and no consistency checks are made and the make
1361 # system is not used on the basis kernel. If updates are required
1362 # in the basis kernel ordinary make commands (without M=...) must
1363 # be used.
1364 #
1365 # The following are the only valid targets when building external
1366 # modules.
1367 # make M=dir clean     Delete all automatically generated files
1368 # make M=dir modules   Make all modules in specified dir
1369 # make M=dir           Same as 'make M=dir modules'
1370 # make M=dir modules_install
1371 #                      Install the modules built in the module directory
1372 #                      Assumes install directory is already created
1373
1374 # We are always building modules
1375 KBUILD_MODULES := 1
1376 PHONY += crmodverdir
1377 crmodverdir:
1378         $(cmd_crmodverdir)
1379
1380 PHONY += $(objtree)/Module.symvers
1381 $(objtree)/Module.symvers:
1382         @test -e $(objtree)/Module.symvers || ( \
1383         echo; \
1384         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1385         echo "           is missing; modules will have no dependencies and modversions."; \
1386         echo )
1387
1388 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1389 PHONY += $(module-dirs) modules
1390 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1391         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1392
1393 modules: $(module-dirs)
1394         @$(kecho) '  Building modules, stage 2.';
1395         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1396
1397 PHONY += modules_install
1398 modules_install: _emodinst_ _emodinst_post
1399
1400 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1401 PHONY += _emodinst_
1402 _emodinst_:
1403         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1404         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1405
1406 PHONY += _emodinst_post
1407 _emodinst_post: _emodinst_
1408         $(call cmd,depmod)
1409
1410 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1411
1412 PHONY += $(clean-dirs) clean
1413 $(clean-dirs):
1414         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1415
1416 clean:  rm-dirs := $(MODVERDIR)
1417 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1418
1419 help:
1420         @echo  '  Building external modules.'
1421         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1422         @echo  ''
1423         @echo  '  modules         - default target, build the module(s)'
1424         @echo  '  modules_install - install the module'
1425         @echo  '  clean           - remove generated files in module directory only'
1426         @echo  ''
1427
1428 # Dummies...
1429 PHONY += prepare scripts
1430 prepare: ;
1431 scripts: ;
1432 endif # KBUILD_EXTMOD
1433
1434 clean: $(clean-dirs)
1435         $(call cmd,rmdirs)
1436         $(call cmd,rmfiles)
1437         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1438                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1439                 -o -name '*.ko.*' \
1440                 -o -name '*.dwo'  \
1441                 -o -name '*.su'  \
1442                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1443                 -o -name '*.symtypes' -o -name 'modules.order' \
1444                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1445                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1446
1447 # Generate tags for editors
1448 # ---------------------------------------------------------------------------
1449 quiet_cmd_tags = GEN     $@
1450       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1451
1452 tags TAGS cscope gtags: FORCE
1453         $(call cmd,tags)
1454
1455 # Scripts to check various things for consistency
1456 # ---------------------------------------------------------------------------
1457
1458 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1459
1460 includecheck:
1461         find $(srctree)/* $(RCS_FIND_IGNORE) \
1462                 -name '*.[hcS]' -type f -print | sort \
1463                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1464
1465 versioncheck:
1466         find $(srctree)/* $(RCS_FIND_IGNORE) \
1467                 -name '*.[hcS]' -type f -print | sort \
1468                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1469
1470 coccicheck:
1471         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1472
1473 namespacecheck:
1474         $(PERL) $(srctree)/scripts/namespace.pl
1475
1476 export_report:
1477         $(PERL) $(srctree)/scripts/export_report.pl
1478
1479 endif #ifeq ($(config-targets),1)
1480 endif #ifeq ($(mixed-targets),1)
1481
1482 PHONY += checkstack kernelrelease kernelversion image_name
1483
1484 # UML needs a little special treatment here.  It wants to use the host
1485 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1486 # else wants $(ARCH), including people doing cross-builds, which means
1487 # that $(SUBARCH) doesn't work here.
1488 ifeq ($(ARCH), um)
1489 CHECKSTACK_ARCH := $(SUBARCH)
1490 else
1491 CHECKSTACK_ARCH := $(ARCH)
1492 endif
1493 checkstack:
1494         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1495         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1496
1497 kernelrelease:
1498         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1499
1500 kernelversion:
1501         @echo $(KERNELVERSION)
1502
1503 image_name:
1504         @echo $(KBUILD_IMAGE)
1505
1506 # Clear a bunch of variables before executing the submake
1507 tools/: FORCE
1508         $(Q)mkdir -p $(objtree)/tools
1509         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
1510
1511 tools/%: FORCE
1512         $(Q)mkdir -p $(objtree)/tools
1513         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
1514
1515 # Single targets
1516 # ---------------------------------------------------------------------------
1517 # Single targets are compatible with:
1518 # - build with mixed source and output
1519 # - build with separate output dir 'make O=...'
1520 # - external modules
1521 #
1522 #  target-dir => where to store outputfile
1523 #  build-dir  => directory in kernel source tree to use
1524
1525 ifeq ($(KBUILD_EXTMOD),)
1526         build-dir  = $(patsubst %/,%,$(dir $@))
1527         target-dir = $(dir $@)
1528 else
1529         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1530         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1531         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1532 endif
1533
1534 %.s: %.c prepare scripts FORCE
1535         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1536 %.i: %.c prepare scripts FORCE
1537         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1538 %.o: %.c prepare scripts FORCE
1539         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1540 %.lst: %.c prepare scripts FORCE
1541         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1542 %.s: %.S prepare scripts FORCE
1543         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1544 %.o: %.S prepare scripts FORCE
1545         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1546 %.symtypes: %.c prepare scripts FORCE
1547         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1548
1549 # Modules
1550 /: prepare scripts FORCE
1551         $(cmd_crmodverdir)
1552         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1553         $(build)=$(build-dir)
1554 # Make sure the latest headers are built for Documentation
1555 Documentation/: headers_install
1556 %/: prepare scripts FORCE
1557         $(cmd_crmodverdir)
1558         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1559         $(build)=$(build-dir)
1560 %.ko: prepare scripts FORCE
1561         $(cmd_crmodverdir)
1562         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1563         $(build)=$(build-dir) $(@:.ko=.o)
1564         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1565
1566 # FIXME Should go into a make.lib or something
1567 # ===========================================================================
1568
1569 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1570       cmd_rmdirs = rm -rf $(rm-dirs)
1571
1572 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1573       cmd_rmfiles = rm -f $(rm-files)
1574
1575 # Run depmod only if we have System.map and depmod is executable
1576 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1577       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1578                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1579
1580 # Create temporary dir for module support files
1581 # clean it up only when building all modules
1582 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1583                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1584
1585 # read all saved command lines
1586
1587 targets := $(wildcard $(sort $(targets)))
1588 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1589
1590 ifneq ($(cmd_files),)
1591   $(cmd_files): ;       # Do not try to update included dependency files
1592   include $(cmd_files)
1593 endif
1594
1595 endif   # skip-makefile
1596
1597 PHONY += FORCE
1598 FORCE:
1599
1600 # Declare the contents of the .PHONY variable as phony.  We keep that
1601 # information in a variable so we can use it in if_changed and friends.
1602 .PHONY: $(PHONY)