Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 26
   4 EXTRAVERSION = -rc4
   5 NAME = Funky Weasel is Jiggy wit it
   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 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Add custom flags here to avoid conflict with updates
  20 EXTRAVERSION := $(EXTRAVERSION)-omap1
  21
  22 # We are using a recursive build, so we need to do a little thinking
  23 # to get the ordering right.
  24 #
  25 # Most importantly: sub-Makefiles should only ever modify files in
  26 # their own directory. If in some directory we have a dependency on
  27 # a file in another dir (which doesn't happen often, but it's often
  28 # unavoidable when linking the built-in.o targets which finally
  29 # turn into vmlinux), we will call a sub make in that other dir, and
  30 # after that we are sure that everything which is in that other dir
  31 # is now up to date.
  32 #
  33 # The only cases where we need to modify files which have global
  34 # effects are thus separated out and done before the recursive
  35 # descending is started. They are now explicitly listed as the
  36 # prepare rule.
  37
  38 # To put more focus on warnings, be less verbose as default
  39 # Use 'make V=1' to see the full commands
  40
  41 ifdef V
  42   ifeq ("$(origin V)", "command line")
  43     KBUILD_VERBOSE = $(V)
  44   endif
  45 endif
  46 ifndef KBUILD_VERBOSE
  47   KBUILD_VERBOSE = 0
  48 endif
  49
  50 # Call a source code checker (by default, "sparse") as part of the
  51 # C compilation.
  52 #
  53 # Use 'make C=1' to enable checking of only re-compiled files.
  54 # Use 'make C=2' to enable checking of *all* source files, regardless
  55 # of whether they are re-compiled or not.
  56 #
  57 # See the file "Documentation/sparse.txt" for more details, including
  58 # where to get the "sparse" utility.
  59
  60 ifdef C
  61   ifeq ("$(origin C)", "command line")
  62     KBUILD_CHECKSRC = $(C)
  63   endif
  64 endif
  65 ifndef KBUILD_CHECKSRC
  66   KBUILD_CHECKSRC = 0
  67 endif
  68
  69 # Use make M=dir to specify directory of external module to build
  70 # Old syntax make ... SUBDIRS=$PWD is still supported
  71 # Setting the environment variable KBUILD_EXTMOD take precedence
  72 ifdef SUBDIRS
  73   KBUILD_EXTMOD ?= $(SUBDIRS)
  74 endif
  75 ifdef M
  76   ifeq ("$(origin M)", "command line")
  77     KBUILD_EXTMOD := $(M)
  78   endif
  79 endif
  80
  81
  82 # kbuild supports saving output files in a separate directory.
  83 # To locate output files in a separate directory two syntaxes are supported.
  84 # In both cases the working directory must be the root of the kernel src.
  85 # 1) O=
  86 # Use "make O=dir/to/store/output/files/"
  87 #
  88 # 2) Set KBUILD_OUTPUT
  89 # Set the environment variable KBUILD_OUTPUT to point to the directory
  90 # where the output files shall be placed.
  91 # export KBUILD_OUTPUT=dir/to/store/output/files/
  92 # make
  93 #
  94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  95 # variable.
  96
  97
  98 # KBUILD_SRC is set on invocation of make in OBJ directory
  99 # KBUILD_SRC is not intended to be used by the regular user (for now)
 100 ifeq ($(KBUILD_SRC),)
 101
 102 # OK, Make called in directory where kernel src resides
 103 # Do we want to locate output files in a separate directory?
 104 ifdef O
 105   ifeq ("$(origin O)", "command line")
 106     KBUILD_OUTPUT := $(O)
 107   endif
 108 endif
 109
 110 # That's our default target when none is given on the command line
 111 PHONY := _all
 112 _all:
 113
 114 # Cancel implicit rules on top Makefile
 115 $(CURDIR)/Makefile Makefile: ;
 116
 117 ifneq ($(KBUILD_OUTPUT),)
 118 # Invoke a second make in the output directory, passing relevant variables
 119 # check that the output directory actually exists
 120 saved-output := $(KBUILD_OUTPUT)
 121 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 122 $(if $(KBUILD_OUTPUT),, \
 123      $(error output directory "$(saved-output)" does not exist))
 124
 125 PHONY += $(MAKECMDGOALS) sub-make
 126
 127 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 128         $(Q)@:
 129
 130 sub-make: FORCE
 131         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 132         KBUILD_SRC=$(CURDIR) \
 133         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 134         $(filter-out _all sub-make,$(MAKECMDGOALS))
 135
 136 # Leave processing to above invocation of make
 137 skip-makefile := 1
 138 endif # ifneq ($(KBUILD_OUTPUT),)
 139 endif # ifeq ($(KBUILD_SRC),)
 140
 141 # We process the rest of the Makefile if this is the final invocation of make
 142 ifeq ($(skip-makefile),)
 143
 144 # If building an external module we do not care about the all: rule
 145 # but instead _all depend on modules
 146 PHONY += all
 147 ifeq ($(KBUILD_EXTMOD),)
 148 _all: all
 149 else
 150 _all: modules
 151 endif
 152
 153 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 154 TOPDIR          := $(srctree)
 155 # FIXME - TOPDIR is obsolete, use srctree/objtree
 156 objtree         := $(CURDIR)
 157 src             := $(srctree)
 158 obj             := $(objtree)
 159
 160 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 161
 162 export srctree objtree VPATH TOPDIR
 163
 164
 165 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 166 # first, and if a usermode build is happening, the "ARCH=um" on the command
 167 # line overrides the setting of ARCH below.  If a native build is happening,
 168 # then ARCH is assigned, getting whatever value it gets normally, and
 169 # SUBARCH is subsequently ignored.
 170
 171 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 172                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 173                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 174                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 175                                   -e s/sh.*/sh/ )
 176
 177 SUBARCH := arm
 178
 179 # Cross compiling and selecting different set of gcc/bin-utils
 180 # ---------------------------------------------------------------------------
 181 #
 182 # When performing cross compilation for other architectures ARCH shall be set
 183 # to the target architecture. (See arch/* for the possibilities).
 184 # ARCH can be set during invocation of make:
 185 # make ARCH=ia64
 186 # Another way is to have ARCH set in the environment.
 187 # The default ARCH is the host where make is executed.
 188
 189 # CROSS_COMPILE specify the prefix used for all executables used
 190 # during compilation. Only gcc and related bin-utils executables
 191 # are prefixed with $(CROSS_COMPILE).
 192 # CROSS_COMPILE can be set on the command line
 193 # make CROSS_COMPILE=ia64-linux-
 194 # Alternatively CROSS_COMPILE can be set in the environment.
 195 # Default value for CROSS_COMPILE is not to prefix executables
 196 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 197 export KBUILD_BUILDHOST := $(SUBARCH)
 198 ARCH            ?= $(SUBARCH)
 199 CROSS_COMPILE   ?= arm-linux-
 200
 201 # Architecture as present in compile.h
 202 UTS_MACHINE     := $(ARCH)
 203 SRCARCH         := $(ARCH)
 204
 205 # Additional ARCH settings for x86
 206 ifeq ($(ARCH),i386)
 207         SRCARCH := x86
 208 endif
 209 ifeq ($(ARCH),x86_64)
 210         SRCARCH := x86
 211 endif
 212
 213 KCONFIG_CONFIG  ?= .config
 214
 215 # SHELL used by kbuild
 216 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 217           else if [ -x /bin/bash ]; then echo /bin/bash; \
 218           else echo sh; fi ; fi)
 219
 220 HOSTCC       = gcc
 221 HOSTCXX      = g++
 222 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 223 HOSTCXXFLAGS = -O2
 224
 225 # Decide whether to build built-in, modular, or both.
 226 # Normally, just do built-in.
 227
 228 KBUILD_MODULES :=
 229 KBUILD_BUILTIN := 1
 230
 231 #       If we have only "make modules", don't compile built-in objects.
 232 #       When we're building modules with modversions, we need to consider
 233 #       the built-in objects during the descend as well, in order to
 234 #       make sure the checksums are up to date before we record them.
 235
 236 ifeq ($(MAKECMDGOALS),modules)
 237   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 238 endif
 239
 240 #       If we have "make <whatever> modules", compile modules
 241 #       in addition to whatever we do anyway.
 242 #       Just "make" or "make all" shall build modules as well
 243
 244 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 245   KBUILD_MODULES := 1
 246 endif
 247
 248 ifeq ($(MAKECMDGOALS),)
 249   KBUILD_MODULES := 1
 250 endif
 251
 252 export KBUILD_MODULES KBUILD_BUILTIN
 253 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 254
 255 # Beautify output
 256 # ---------------------------------------------------------------------------
 257 #
 258 # Normally, we echo the whole command before executing it. By making
 259 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 260 # $(quiet) to choose other forms of output instead, e.g.
 261 #
 262 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 263 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 264 #
 265 # If $(quiet) is empty, the whole command will be printed.
 266 # If it is set to "quiet_", only the short version will be printed.
 267 # If it is set to "silent_", nothing will be printed at all, since
 268 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 269 #
 270 # A simple variant is to prefix commands with $(Q) - that's useful
 271 # for commands that shall be hidden in non-verbose mode.
 272 #
 273 #       $(Q)ln $@ :<
 274 #
 275 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 276 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 277
 278 ifeq ($(KBUILD_VERBOSE),1)
 279   quiet =
 280   Q =
 281 else
 282   quiet=quiet_
 283   Q = @
 284 endif
 285
 286 # If the user is running make -s (silent mode), suppress echoing of
 287 # commands
 288
 289 ifneq ($(findstring s,$(MAKEFLAGS)),)
 290   quiet=silent_
 291 endif
 292
 293 export quiet Q KBUILD_VERBOSE
 294
 295
 296 # Look for make include files relative to root of kernel src
 297 MAKEFLAGS += --include-dir=$(srctree)
 298
 299 # We need some generic definitions (do not try to remake the file).
 300 $(srctree)/scripts/Kbuild.include: ;
 301 include $(srctree)/scripts/Kbuild.include
 302
 303 # Make variables (CC, etc...)
 304
 305 AS              = $(CROSS_COMPILE)as
 306 LD              = $(CROSS_COMPILE)ld
 307 CC              = $(CROSS_COMPILE)gcc
 308 CPP             = $(CC) -E
 309 AR              = $(CROSS_COMPILE)ar
 310 NM              = $(CROSS_COMPILE)nm
 311 STRIP           = $(CROSS_COMPILE)strip
 312 OBJCOPY         = $(CROSS_COMPILE)objcopy
 313 OBJDUMP         = $(CROSS_COMPILE)objdump
 314 AWK             = awk
 315 GENKSYMS        = scripts/genksyms/genksyms
 316 DEPMOD          = /sbin/depmod
 317 KALLSYMS        = scripts/kallsyms
 318 PERL            = perl
 319 CHECK           = sparse
 320
 321 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 322 MODFLAGS        = -DMODULE
 323 CFLAGS_MODULE   = $(MODFLAGS)
 324 AFLAGS_MODULE   = $(MODFLAGS)
 325 LDFLAGS_MODULE  =
 326 CFLAGS_KERNEL   =
 327 AFLAGS_KERNEL   =
 328
 329
 330 # Use LINUXINCLUDE when you must reference the include/ directory.
 331 # Needed to be compatible with the O= option
 332 LINUXINCLUDE    := -Iinclude \
 333                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 334                    -include include/linux/autoconf.h
 335
 336 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 337
 338 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 339                    -fno-strict-aliasing -fno-common \
 340                    -Werror-implicit-function-declaration
 341 KBUILD_AFLAGS   := -D__ASSEMBLY__
 342
 343 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 344 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 345 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 346
 347 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 348 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 349 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 350 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 351
 352 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 353 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 354 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 355
 356 # When compiling out-of-tree modules, put MODVERDIR in the module
 357 # tree rather than in the kernel tree. The kernel tree might
 358 # even be read-only.
 359 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 360
 361 # Files to ignore in find ... statements
 362
 363 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 364 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 365
 366 # ===========================================================================
 367 # Rules shared between *config targets and build targets
 368
 369 # Basic helpers built in scripts/
 370 PHONY += scripts_basic
 371 scripts_basic:
 372         $(Q)$(MAKE) $(build)=scripts/basic
 373
 374 # To avoid any implicit rule to kick in, define an empty command.
 375 scripts/basic/%: scripts_basic ;
 376
 377 PHONY += outputmakefile
 378 # outputmakefile generates a Makefile in the output directory, if using a
 379 # separate output directory. This allows convenient use of make in the
 380 # output directory.
 381 outputmakefile:
 382 ifneq ($(KBUILD_SRC),)
 383         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 384             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 385 endif
 386
 387 # To make sure we do not include .config for any of the *config targets
 388 # catch them early, and hand them over to scripts/kconfig/Makefile
 389 # It is allowed to specify more targets when calling make, including
 390 # mixing *config targets and build targets.
 391 # For example 'make oldconfig all'.
 392 # Detect when mixed targets is specified, and make a second invocation
 393 # of make so .config is not included in this case either (for *config).
 394
 395 no-dot-config-targets := clean mrproper distclean \
 396                          cscope TAGS tags help %docs check% \
 397                          include/linux/version.h headers_% \
 398                          kernelrelease kernelversion
 399
 400 config-targets := 0
 401 mixed-targets  := 0
 402 dot-config     := 1
 403
 404 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 405         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 406                 dot-config := 0
 407         endif
 408 endif
 409
 410 ifeq ($(KBUILD_EXTMOD),)
 411         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 412                 config-targets := 1
 413                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 414                         mixed-targets := 1
 415                 endif
 416         endif
 417 endif
 418
 419 ifeq ($(mixed-targets),1)
 420 # ===========================================================================
 421 # We're called with mixed targets (*config and build targets).
 422 # Handle them one by one.
 423
 424 %:: FORCE
 425         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 426
 427 else
 428 ifeq ($(config-targets),1)
 429 # ===========================================================================
 430 # *config targets only - make sure prerequisites are updated, and descend
 431 # in scripts/kconfig to make the *config target
 432
 433 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 434 # KBUILD_DEFCONFIG may point out an alternative default configuration
 435 # used for 'make defconfig'
 436 include $(srctree)/arch/$(SRCARCH)/Makefile
 437 export KBUILD_DEFCONFIG
 438
 439 config %config: scripts_basic outputmakefile FORCE
 440         $(Q)mkdir -p include/linux include/config
 441         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 442
 443 else
 444 # ===========================================================================
 445 # Build targets only - this includes vmlinux, arch specific targets, clean
 446 # targets and others. In general all targets except *config targets.
 447
 448 ifeq ($(KBUILD_EXTMOD),)
 449 # Additional helpers built in scripts/
 450 # Carefully list dependencies so we do not try to build scripts twice
 451 # in parallel
 452 PHONY += scripts
 453 scripts: scripts_basic include/config/auto.conf
 454         $(Q)$(MAKE) $(build)=$(@)
 455
 456 # Objects we will link into vmlinux / subdirs we need to visit
 457 init-y          := init/
 458 drivers-y       := drivers/ sound/
 459 net-y           := net/
 460 libs-y          := lib/
 461 core-y          := usr/
 462 endif # KBUILD_EXTMOD
 463
 464 ifeq ($(dot-config),1)
 465 # Read in config
 466 -include include/config/auto.conf
 467
 468 ifeq ($(KBUILD_EXTMOD),)
 469 # Read in dependencies to all Kconfig* files, make sure to run
 470 # oldconfig if changes are detected.
 471 -include include/config/auto.conf.cmd
 472
 473 # To avoid any implicit rule to kick in, define an empty command
 474 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 475
 476 # If .config is newer than include/config/auto.conf, someone tinkered
 477 # with it and forgot to run make oldconfig.
 478 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 479 # we execute the config step to be sure to catch updated Kconfig files
 480 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 481         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 482 else
 483 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 484 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 485 PHONY += include/config/auto.conf
 486
 487 include/config/auto.conf:
 488         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 489         echo;                                                           \
 490         echo "  ERROR: Kernel configuration is invalid.";               \
 491         echo "         include/linux/autoconf.h or $@ are missing.";    \
 492         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 493         echo;                                                           \
 494         /bin/false)
 495
 496 endif # KBUILD_EXTMOD
 497
 498 else
 499 # Dummy target needed, because used as prerequisite
 500 include/config/auto.conf: ;
 501 endif # $(dot-config)
 502
 503 # The all: target is the default when no target is given on the
 504 # command line.
 505 # This allow a user to issue only 'make' to build a kernel including modules
 506 # Defaults vmlinux but it is usually overridden in the arch makefile
 507 all: vmlinux
 508
 509 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 510 KBUILD_CFLAGS   += -Os
 511 else
 512 KBUILD_CFLAGS   += -O2
 513 endif
 514
 515 ifneq (CONFIG_FRAME_WARN,0)
 516 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 517 endif
 518
 519 # Force gcc to behave correct even for buggy distributions
 520 # Arch Makefiles may override this setting
 521 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 522
 523 include $(srctree)/arch/$(SRCARCH)/Makefile
 524
 525 ifdef CONFIG_FRAME_POINTER
 526 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 527 else
 528 KBUILD_CFLAGS   += -fomit-frame-pointer
 529 endif
 530
 531 ifdef CONFIG_DEBUG_INFO
 532 KBUILD_CFLAGS   += -g
 533 KBUILD_AFLAGS   += -gdwarf-2
 534 endif
 535
 536 # We trigger additional mismatches with less inlining
 537 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 538 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 539 endif
 540
 541 # arch Makefile may override CC so keep this after arch Makefile is included
 542 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 543 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 544
 545 # warn about C99 declaration after statement
 546 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 547
 548 # disable pointer signed / unsigned warnings in gcc 4.0
 549 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 550
 551 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 552 # But warn user when we do so
 553 warn-assign = \
 554 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 555
 556 ifneq ($(KCPPFLAGS),)
 557         $(call warn-assign,CPPFLAGS)
 558         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 559 endif
 560 ifneq ($(KAFLAGS),)
 561         $(call warn-assign,AFLAGS)
 562         KBUILD_AFLAGS += $(KAFLAGS)
 563 endif
 564 ifneq ($(KCFLAGS),)
 565         $(call warn-assign,CFLAGS)
 566         KBUILD_CFLAGS += $(KCFLAGS)
 567 endif
 568
 569 # Use --build-id when available.
 570 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 571                               $(call ld-option, -Wl$(comma)--build-id,))
 572 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 573 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 574
 575 # Default kernel image to build when no specific target is given.
 576 # KBUILD_IMAGE may be overruled on the command line or
 577 # set in the environment
 578 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 579 # this default value
 580 export KBUILD_IMAGE ?= vmlinux
 581
 582 #
 583 # INSTALL_PATH specifies where to place the updated kernel and system map
 584 # images. Default is /boot, but you can set it to other values
 585 export  INSTALL_PATH ?= /boot
 586
 587 #
 588 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 589 # relocations required by build roots.  This is not defined in the
 590 # makefile but the argument can be passed to make if needed.
 591 #
 592
 593 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 594 export MODLIB
 595
 596 #
 597 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 598 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 599 #  the default option --strip-debug will be used.  Otherwise,
 600 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 601
 602 ifdef INSTALL_MOD_STRIP
 603 ifeq ($(INSTALL_MOD_STRIP),1)
 604 mod_strip_cmd = $(STRIP) --strip-debug
 605 else
 606 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 607 endif # INSTALL_MOD_STRIP=1
 608 else
 609 mod_strip_cmd = true
 610 endif # INSTALL_MOD_STRIP
 611 export mod_strip_cmd
 612
 613
 614 ifeq ($(KBUILD_EXTMOD),)
 615 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 616
 617 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 618                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 619                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 620
 621 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 622                      $(init-n) $(init-) \
 623                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 624                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 625
 626 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 627 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 628 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 629 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 630 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 631 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 632 libs-y          := $(libs-y1) $(libs-y2)
 633
 634 # Build vmlinux
 635 # ---------------------------------------------------------------------------
 636 # vmlinux is built from the objects selected by $(vmlinux-init) and
 637 # $(vmlinux-main). Most are built-in.o files from top-level directories
 638 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 639 # Ordering when linking is important, and $(vmlinux-init) must be first.
 640 #
 641 # vmlinux
 642 #   ^
 643 #   |
 644 #   +-< $(vmlinux-init)
 645 #   |   +--< init/version.o + more
 646 #   |
 647 #   +--< $(vmlinux-main)
 648 #   |    +--< driver/built-in.o mm/built-in.o + more
 649 #   |
 650 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 651 #
 652 # vmlinux version (uname -v) cannot be updated during normal
 653 # descending-into-subdirs phase since we do not yet know if we need to
 654 # update vmlinux.
 655 # Therefore this step is delayed until just before final link of vmlinux -
 656 # except in the kallsyms case where it is done just before adding the
 657 # symbols to the kernel.
 658 #
 659 # System.map is generated to document addresses of all kernel symbols
 660
 661 vmlinux-init := $(head-y) $(init-y)
 662 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 663 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 664 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 665 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 666
 667 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 668 # May be overridden by arch/$(ARCH)/Makefile
 669 quiet_cmd_vmlinux__ ?= LD      $@
 670       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 671       -T $(vmlinux-lds) $(vmlinux-init)                          \
 672       --start-group $(vmlinux-main) --end-group                  \
 673       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 674
 675 # Generate new vmlinux version
 676 quiet_cmd_vmlinux_version = GEN     .version
 677       cmd_vmlinux_version = set -e;                     \
 678         if [ ! -r .version ]; then                      \
 679           rm -f .version;                               \
 680           echo 1 >.version;                             \
 681         else                                            \
 682           mv .version .old_version;                     \
 683           expr 0$$(cat .old_version) + 1 >.version;     \
 684         fi;                                             \
 685         $(MAKE) $(build)=init
 686
 687 # Generate System.map
 688 quiet_cmd_sysmap = SYSMAP
 689       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 690
 691 # Link of vmlinux
 692 # If CONFIG_KALLSYMS is set .version is already updated
 693 # Generate System.map and verify that the content is consistent
 694 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 695 # First command is ':' to allow us to use + in front of the rule
 696 define rule_vmlinux__
 697         :
 698         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 699
 700         $(call cmd,vmlinux__)
 701         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 702
 703         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 704           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 705         $(cmd_sysmap) $@ System.map;                                         \
 706         if [ $$? -ne 0 ]; then                                               \
 707                 rm -f $@;                                                    \
 708                 /bin/false;                                                  \
 709         fi;
 710         $(verify_kallsyms)
 711 endef
 712
 713
 714 ifdef CONFIG_KALLSYMS
 715 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 716 # It's a three stage process:
 717 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 718 #   empty
 719 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 720 #   the right size - vmlinux version (uname -v) is updated during this step
 721 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 722 #   but due to the added section, some addresses have shifted.
 723 #   From here, we generate a correct .tmp_kallsyms2.o
 724 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 725 # o Verify that the System.map from vmlinux matches the map from
 726 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 727 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 728 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 729 #   temporary bypass to allow the kernel to be built while the
 730 #   maintainers work out what went wrong with kallsyms.
 731
 732 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 733 last_kallsyms := 3
 734 else
 735 last_kallsyms := 2
 736 endif
 737
 738 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 739
 740 define verify_kallsyms
 741         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 742           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 743           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 744         $(Q)cmp -s System.map .tmp_System.map ||                             \
 745                 (echo Inconsistent kallsyms data;                            \
 746                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 747                  rm .tmp_kallsyms* ; /bin/false )
 748 endef
 749
 750 # Update vmlinux version before link
 751 # Use + in front of this rule to silent warning about make -j1
 752 # First command is ':' to allow us to use + in front of this rule
 753 cmd_ksym_ld = $(cmd_vmlinux__)
 754 define rule_ksym_ld
 755         :
 756         +$(call cmd,vmlinux_version)
 757         $(call cmd,vmlinux__)
 758         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 759 endef
 760
 761 # Generate .S file with all kernel symbols
 762 quiet_cmd_kallsyms = KSYM    $@
 763       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 764                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 765
 766 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 767         $(call if_changed_dep,as_o_S)
 768
 769 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 770         $(call cmd,kallsyms)
 771
 772 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 773 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 774         $(call if_changed_rule,ksym_ld)
 775
 776 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 777         $(call if_changed,vmlinux__)
 778
 779 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 780         $(call if_changed,vmlinux__)
 781
 782 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 783 $(KALLSYMS): scripts ;
 784
 785 # Generate some data for debugging strange kallsyms problems
 786 debug_kallsyms: .tmp_map$(last_kallsyms)
 787
 788 .tmp_map%: .tmp_vmlinux% FORCE
 789         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 790
 791 .tmp_map3: .tmp_map2
 792
 793 .tmp_map2: .tmp_map1
 794
 795 endif # ifdef CONFIG_KALLSYMS
 796
 797 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 798 # relevant sections renamed as per the linker script.
 799 quiet_cmd_vmlinux-modpost = LD      $@
 800       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 801          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 802          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 803 define rule_vmlinux-modpost
 804         :
 805         +$(call cmd,vmlinux-modpost)
 806         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 807         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 808 endef
 809
 810 # vmlinux image - including updated kernel symbols
 811 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 812 ifdef CONFIG_HEADERS_CHECK
 813         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 814 endif
 815 ifdef CONFIG_SAMPLES
 816         $(Q)$(MAKE) $(build)=samples
 817 endif
 818         $(call vmlinux-modpost)
 819         $(call if_changed_rule,vmlinux__)
 820         $(Q)rm -f .old_version
 821
 822 # build vmlinux.o first to catch section mismatch errors early
 823 ifdef CONFIG_KALLSYMS
 824 .tmp_vmlinux1: vmlinux.o
 825 endif
 826
 827 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 828 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 829         $(call if_changed_rule,vmlinux-modpost)
 830
 831 # The actual objects are generated when descending,
 832 # make sure no implicit rule kicks in
 833 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 834
 835 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 836 # Preset locale variables to speed up the build process. Limit locale
 837 # tweaks to this spot to avoid wrong language settings when running
 838 # make menuconfig etc.
 839 # Error messages still appears in the original language
 840
 841 PHONY += $(vmlinux-dirs)
 842 $(vmlinux-dirs): prepare scripts
 843         $(Q)$(MAKE) $(build)=$@
 844
 845 # Build the kernel release string
 846 #
 847 # The KERNELRELEASE value built here is stored in the file
 848 # include/config/kernel.release, and is used when executing several
 849 # make targets, such as "make install" or "make modules_install."
 850 #
 851 # The eventual kernel release string consists of the following fields,
 852 # shown in a hierarchical format to show how smaller parts are concatenated
 853 # to form the larger and final value, with values coming from places like
 854 # the Makefile, kernel config options, make command line options and/or
 855 # SCM tag information.
 856 #
 857 #       $(KERNELVERSION)
 858 #         $(VERSION)                    eg, 2
 859 #         $(PATCHLEVEL)                 eg, 6
 860 #         $(SUBLEVEL)                   eg, 18
 861 #         $(EXTRAVERSION)               eg, -rc6
 862 #       $(localver-full)
 863 #         $(localver)
 864 #           localversion*               (files without backups, containing '~')
 865 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 866 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 867 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 868 #           $(LOCALVERSION)             (from make command line if provided)
 869 #
 870 #  Note how the final $(localver-auto) string is included *only* if the
 871 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 872 # moment, only git is supported but other SCMs can edit the script
 873 # scripts/setlocalversion and add the appropriate checks as needed.
 874
 875 pattern = ".*/localversion[^~]*"
 876 string  = $(shell cat /dev/null \
 877            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 878
 879 localver = $(subst $(space),, $(string) \
 880                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 881
 882 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 883 # and if the SCM is know a tag from the SCM is appended.
 884 # The appended tag is determined by the SCM used.
 885 #
 886 # Currently, only git is supported.
 887 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 888 # checks as needed.
 889 ifdef CONFIG_LOCALVERSION_AUTO
 890         _localver-auto = $(shell $(CONFIG_SHELL) \
 891                           $(srctree)/scripts/setlocalversion $(srctree))
 892         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 893 endif
 894
 895 localver-full = $(localver)$(localver-auto)
 896
 897 # Store (new) KERNELRELASE string in include/config/kernel.release
 898 kernelrelease = $(KERNELVERSION)$(localver-full)
 899 include/config/kernel.release: include/config/auto.conf FORCE
 900         $(Q)rm -f $@
 901         $(Q)echo $(kernelrelease) > $@
 902
 903
 904 # Things we need to do before we recursively start building the kernel
 905 # or the modules are listed in "prepare".
 906 # A multi level approach is used. prepareN is processed before prepareN-1.
 907 # archprepare is used in arch Makefiles and when processed asm symlink,
 908 # version.h and scripts_basic is processed / created.
 909
 910 # Listed in dependency order
 911 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 912
 913 # prepare3 is used to check if we are building in a separate output directory,
 914 # and if so do:
 915 # 1) Check that make has not been executed in the kernel src $(srctree)
 916 # 2) Create the include2 directory, used for the second asm symlink
 917 prepare3: include/config/kernel.release
 918 ifneq ($(KBUILD_SRC),)
 919         @echo '  Using $(srctree) as source for kernel'
 920         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 921                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 922                 echo "  in the '$(srctree)' directory.";\
 923                 /bin/false; \
 924         fi;
 925         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 926         $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 927 endif
 928
 929 # prepare2 creates a makefile if using a separate output directory
 930 prepare2: prepare3 outputmakefile
 931
 932 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 933                    include/asm include/config/auto.conf
 934         $(cmd_crmodverdir)
 935
 936 archprepare: prepare1 scripts_basic
 937
 938 prepare0: archprepare FORCE
 939         $(Q)$(MAKE) $(build)=.
 940         $(Q)$(MAKE) $(build)=. missing-syscalls
 941
 942 # All the preparing..
 943 prepare: prepare0
 944
 945 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 946 # done in arch/$(ARCH)/kernel/Makefile
 947
 948 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 949
 950 # The asm symlink changes when $(ARCH) changes.
 951 # Detect this and ask user to run make mrproper
 952
 953 include/asm: FORCE
 954         $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
 955         if [ -L include/asm ]; then                                     \
 956                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
 957                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 958                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 959                         exit 1;                                         \
 960                 fi;                                                     \
 961         else                                                            \
 962                 echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
 963                 if [ ! -d include ]; then                               \
 964                         mkdir -p include;                               \
 965                 fi;                                                     \
 966                 ln -fsn asm-$(SRCARCH) $@;                              \
 967         fi
 968
 969 # Generate some files
 970 # ---------------------------------------------------------------------------
 971
 972 # KERNELRELEASE can change from a few different places, meaning version.h
 973 # needs to be updated, so this check is forced on all builds
 974
 975 uts_len := 64
 976 define filechk_utsrelease.h
 977         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 978           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 979           exit 1;                                                         \
 980         fi;                                                               \
 981         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 982 endef
 983
 984 define filechk_version.h
 985         (echo \#define LINUX_VERSION_CODE $(shell                             \
 986         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 987         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 988 endef
 989
 990 include/linux/version.h: $(srctree)/Makefile FORCE
 991         $(call filechk,version.h)
 992
 993 include/linux/utsrelease.h: include/config/kernel.release FORCE
 994         $(call filechk,utsrelease.h)
 995
 996 # ---------------------------------------------------------------------------
 997
 998 PHONY += depend dep
 999 depend dep:
1000         @echo '*** Warning: make $@ is unnecessary now.'
1001
1002 # ---------------------------------------------------------------------------
1003 # Kernel headers
1004 INSTALL_HDR_PATH=$(objtree)/usr
1005 export INSTALL_HDR_PATH
1006
1007 HDRFILTER=generic i386 x86_64
1008 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
1009
1010 PHONY += headers_install_all
1011 headers_install_all: include/linux/version.h scripts_basic FORCE
1012         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1013         $(Q)for arch in $(HDRARCHES); do \
1014          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
1015          done
1016
1017 PHONY += headers_install
1018 headers_install: include/linux/version.h scripts_basic FORCE
1019         @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1020           echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1021           exit 1 ; fi
1022         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1023         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1024
1025 PHONY += headers_check_all
1026 headers_check_all: headers_install_all
1027         $(Q)for arch in $(HDRARCHES); do \
1028          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1029          done
1030
1031 PHONY += headers_check
1032 headers_check: headers_install
1033         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1034
1035 # ---------------------------------------------------------------------------
1036 # Modules
1037
1038 ifdef CONFIG_MODULES
1039
1040 # By default, build modules as well
1041
1042 all: modules
1043
1044 #       Build modules
1045 #
1046 #       A module can be listed more than once in obj-m resulting in
1047 #       duplicate lines in modules.order files.  Those are removed
1048 #       using awk while concatenating to the final file.
1049
1050 PHONY += modules
1051 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1052         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1053         @echo '  Building modules, stage 2.';
1054         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1055
1056
1057 # Target to prepare building external modules
1058 PHONY += modules_prepare
1059 modules_prepare: prepare scripts
1060
1061 # Target to install modules
1062 PHONY += modules_install
1063 modules_install: _modinst_ _modinst_post
1064
1065 PHONY += _modinst_
1066 _modinst_:
1067         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1068                 echo "Warning: you may need to install module-init-tools"; \
1069                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1070                 sleep 1; \
1071         fi
1072         @rm -rf $(MODLIB)/kernel
1073         @rm -f $(MODLIB)/source
1074         @mkdir -p $(MODLIB)/kernel
1075         @ln -s $(srctree) $(MODLIB)/source
1076         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1077                 rm -f $(MODLIB)/build ; \
1078                 ln -s $(objtree) $(MODLIB)/build ; \
1079         fi
1080         @cp -f $(objtree)/modules.order $(MODLIB)/
1081         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1082
1083 # This depmod is only for convenience to give the initial
1084 # boot a modules.dep even before / is mounted read-write.  However the
1085 # boot script depmod is the master version.
1086 PHONY += _modinst_post
1087 _modinst_post: _modinst_
1088         $(call cmd,depmod)
1089
1090 else # CONFIG_MODULES
1091
1092 # Modules not configured
1093 # ---------------------------------------------------------------------------
1094
1095 modules modules_install: FORCE
1096         @echo
1097         @echo "The present kernel configuration has modules disabled."
1098         @echo "Type 'make config' and enable loadable module support."
1099         @echo "Then build a kernel with module support enabled."
1100         @echo
1101         @exit 1
1102
1103 endif # CONFIG_MODULES
1104
1105 ###
1106 # Cleaning is done on three levels.
1107 # make clean     Delete most generated files
1108 #                Leave enough to build external modules
1109 # make mrproper  Delete the current configuration, and all generated files
1110 # make distclean Remove editor backup files, patch leftover files and the like
1111
1112 # Directories & files removed with 'make clean'
1113 CLEAN_DIRS  += $(MODVERDIR)
1114 CLEAN_FILES +=  vmlinux System.map \
1115                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1116
1117 # Directories & files removed with 'make mrproper'
1118 MRPROPER_DIRS  += include/config include2 usr/include
1119 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1120                   include/linux/autoconf.h include/linux/version.h      \
1121                   include/linux/utsrelease.h                            \
1122                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1123                   Module.symvers tags TAGS cscope*
1124
1125 # clean - Delete most, but leave enough to build external modules
1126 #
1127 clean: rm-dirs  := $(CLEAN_DIRS)
1128 clean: rm-files := $(CLEAN_FILES)
1129 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1130
1131 PHONY += $(clean-dirs) clean archclean
1132 $(clean-dirs):
1133         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1134
1135 clean: archclean $(clean-dirs)
1136         $(call cmd,rmdirs)
1137         $(call cmd,rmfiles)
1138         @find . $(RCS_FIND_IGNORE) \
1139                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1140                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1141                 -o -name '*.symtypes' -o -name 'modules.order' \) \
1142                 -type f -print | xargs rm -f
1143
1144 # mrproper - Delete all generated files, including .config
1145 #
1146 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1147 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1148 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1149
1150 PHONY += $(mrproper-dirs) mrproper archmrproper
1151 $(mrproper-dirs):
1152         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1153
1154 mrproper: clean archmrproper $(mrproper-dirs)
1155         $(call cmd,rmdirs)
1156         $(call cmd,rmfiles)
1157
1158 # distclean
1159 #
1160 PHONY += distclean
1161
1162 distclean: mrproper
1163         @find $(srctree) $(RCS_FIND_IGNORE) \
1164                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1165                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1166                 -o -name '.*.rej' -o -size 0 \
1167                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1168                 -type f -print | xargs rm -f
1169
1170
1171 # Packaging of the kernel to various formats
1172 # ---------------------------------------------------------------------------
1173 # rpm target kept for backward compatibility
1174 package-dir     := $(srctree)/scripts/package
1175
1176 %pkg: include/config/kernel.release FORCE
1177         $(Q)$(MAKE) $(build)=$(package-dir) $@
1178 rpm: include/config/kernel.release FORCE
1179         $(Q)$(MAKE) $(build)=$(package-dir) $@
1180
1181
1182 # Brief documentation of the typical targets used
1183 # ---------------------------------------------------------------------------
1184
1185 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1186 boards := $(notdir $(boards))
1187 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1188 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1189
1190 help:
1191         @echo  'Cleaning targets:'
1192         @echo  '  clean           - Remove most generated files but keep the config and'
1193         @echo  '                    enough build support to build external modules'
1194         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1195         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1196         @echo  ''
1197         @echo  'Configuration targets:'
1198         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1199         @echo  ''
1200         @echo  'Other generic targets:'
1201         @echo  '  all             - Build all targets marked with [*]'
1202         @echo  '* vmlinux         - Build the bare kernel'
1203         @echo  '* modules         - Build all modules'
1204         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1205         @echo  '  dir/            - Build all files in dir and below'
1206         @echo  '  dir/file.[ois]  - Build specified target only'
1207         @echo  '  dir/file.ko     - Build module including final link'
1208         @echo  '  prepare         - Set up for building external modules'
1209         @echo  '  tags/TAGS       - Generate tags file for editors'
1210         @echo  '  cscope          - Generate cscope index'
1211         @echo  '  kernelrelease   - Output the release version string'
1212         @echo  '  kernelversion   - Output the version stored in Makefile'
1213         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1214          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1215          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1216          fi
1217         @echo  ''
1218         @echo  'Static analysers'
1219         @echo  '  checkstack      - Generate a list of stack hogs'
1220         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1221         @echo  '  versioncheck    - Sanity check on version.h usage'
1222         @echo  '  includecheck    - Check for duplicate included header files'
1223         @echo  '  export_report   - List the usages of all exported symbols'
1224         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1225          echo  '  headers_check   - Sanity check on exported headers'; \
1226          fi
1227         @echo  ''
1228         @echo  'Kernel packaging:'
1229         @$(MAKE) $(build)=$(package-dir) help
1230         @echo  ''
1231         @echo  'Documentation targets:'
1232         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1233         @echo  ''
1234         @echo  'Architecture specific targets ($(SRCARCH)):'
1235         @$(if $(archhelp),$(archhelp),\
1236                 echo '  No architecture specific help defined for $(SRCARCH)')
1237         @echo  ''
1238         @$(if $(boards), \
1239                 $(foreach b, $(boards), \
1240                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1241                 echo '')
1242         @$(if $(board-dirs), \
1243                 $(foreach b, $(board-dirs), \
1244                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1245                 printf "  %-16s - Show all of the above\\n" help-boards; \
1246                 echo '')
1247
1248         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1249         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1250         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1251         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1252         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1253         @echo  ''
1254         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1255         @echo  'For further info see the ./README file'
1256
1257
1258 help-board-dirs := $(addprefix help-,$(board-dirs))
1259
1260 help-boards: $(help-board-dirs)
1261
1262 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1263
1264 $(help-board-dirs): help-%:
1265         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1266         @$(if $(boards-per-dir), \
1267                 $(foreach b, $(boards-per-dir), \
1268                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1269                 echo '')
1270
1271
1272 # Documentation targets
1273 # ---------------------------------------------------------------------------
1274 %docs: scripts_basic FORCE
1275         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1276
1277 else # KBUILD_EXTMOD
1278
1279 ###
1280 # External module support.
1281 # When building external modules the kernel used as basis is considered
1282 # read-only, and no consistency checks are made and the make
1283 # system is not used on the basis kernel. If updates are required
1284 # in the basis kernel ordinary make commands (without M=...) must
1285 # be used.
1286 #
1287 # The following are the only valid targets when building external
1288 # modules.
1289 # make M=dir clean     Delete all automatically generated files
1290 # make M=dir modules   Make all modules in specified dir
1291 # make M=dir           Same as 'make M=dir modules'
1292 # make M=dir modules_install
1293 #                      Install the modules built in the module directory
1294 #                      Assumes install directory is already created
1295
1296 # We are always building modules
1297 KBUILD_MODULES := 1
1298 PHONY += crmodverdir
1299 crmodverdir:
1300         $(cmd_crmodverdir)
1301
1302 PHONY += $(objtree)/Module.symvers
1303 $(objtree)/Module.symvers:
1304         @test -e $(objtree)/Module.symvers || ( \
1305         echo; \
1306         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1307         echo "           is missing; modules will have no dependencies and modversions."; \
1308         echo )
1309
1310 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1311 PHONY += $(module-dirs) modules
1312 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1313         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1314
1315 modules: $(module-dirs)
1316         @echo '  Building modules, stage 2.';
1317         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1318
1319 PHONY += modules_install
1320 modules_install: _emodinst_ _emodinst_post
1321
1322 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1323 PHONY += _emodinst_
1324 _emodinst_:
1325         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1326         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1327
1328 PHONY += _emodinst_post
1329 _emodinst_post: _emodinst_
1330         $(call cmd,depmod)
1331
1332 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1333
1334 PHONY += $(clean-dirs) clean
1335 $(clean-dirs):
1336         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1337
1338 clean:  rm-dirs := $(MODVERDIR)
1339 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1340 clean: $(clean-dirs)
1341         $(call cmd,rmdirs)
1342         $(call cmd,rmfiles)
1343         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1344                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1345                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1346                 -type f -print | xargs rm -f
1347
1348 help:
1349         @echo  '  Building external modules.'
1350         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1351         @echo  ''
1352         @echo  '  modules         - default target, build the module(s)'
1353         @echo  '  modules_install - install the module'
1354         @echo  '  clean           - remove generated files in module directory only'
1355         @echo  ''
1356
1357 # Dummies...
1358 PHONY += prepare scripts
1359 prepare: ;
1360 scripts: ;
1361 endif # KBUILD_EXTMOD
1362
1363 # Generate tags for editors
1364 # ---------------------------------------------------------------------------
1365
1366 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1367 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1368 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1369
1370 ifeq ($(src),$(obj))
1371 __srctree =
1372 else
1373 __srctree = $(srctree)/
1374 endif
1375
1376 ifeq ($(ALLSOURCE_ARCHS),)
1377 ifeq ($(ARCH),um)
1378 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1379 else
1380 ALLINCLUDE_ARCHS := $(SRCARCH)
1381 endif
1382 else
1383 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1384 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1385 endif
1386
1387 ALLSOURCE_ARCHS := $(SRCARCH)
1388
1389 define find-sources
1390         ( for arch in $(ALLSOURCE_ARCHS) ; do \
1391                find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1392                     -name $1 -print; \
1393           done ; \
1394           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1395                -name $1 -print; \
1396           find $(__srctree)include $(RCS_FIND_IGNORE) \
1397                \( -name config -o -name 'asm-*' \) -prune \
1398                -o -name $1 -print; \
1399           for arch in $(ALLINCLUDE_ARCHS) ; do \
1400                find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1401                     -name $1 -print; \
1402           done ; \
1403           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1404                -name $1 -print; \
1405           find $(__srctree) $(RCS_FIND_IGNORE) \
1406                \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1407                -name $1 -print; \
1408           )
1409 endef
1410
1411 define all-sources
1412         $(call find-sources,'*.[chS]')
1413 endef
1414 define all-kconfigs
1415         $(call find-sources,'Kconfig*')
1416 endef
1417 define all-defconfigs
1418         $(call find-sources,'defconfig')
1419 endef
1420
1421 define xtags
1422         if $1 --version 2>&1 | grep -iq exuberant; then \
1423             $(all-sources) | xargs $1 -a \
1424                 -I __initdata,__exitdata,__acquires,__releases \
1425                 -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1426                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1427                 --extra=+f --c-kinds=+px \
1428                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1429             $(all-kconfigs) | xargs $1 -a \
1430                 --langdef=kconfig \
1431                 --language-force=kconfig \
1432                 --regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1433             $(all-defconfigs) | xargs -r $1 -a \
1434                 --langdef=dotconfig \
1435                 --language-force=dotconfig \
1436                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1437         elif $1 --version 2>&1 | grep -iq emacs; then \
1438             $(all-sources) | xargs $1 -a; \
1439             $(all-kconfigs) | xargs $1 -a \
1440                 --regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1441             $(all-defconfigs) | xargs -r $1 -a \
1442                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1443         else \
1444             $(all-sources) | xargs $1 -a; \
1445         fi
1446 endef
1447
1448 quiet_cmd_cscope-file = FILELST cscope.files
1449       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1450
1451 quiet_cmd_cscope = MAKE    cscope.out
1452       cmd_cscope = cscope -b
1453
1454 cscope: FORCE
1455         $(call cmd,cscope-file)
1456         $(call cmd,cscope)
1457
1458 quiet_cmd_TAGS = MAKE   $@
1459 define cmd_TAGS
1460         rm -f $@; \
1461         $(call xtags,etags)
1462 endef
1463
1464 TAGS: FORCE
1465         $(call cmd,TAGS)
1466
1467 quiet_cmd_tags = MAKE   $@
1468 define cmd_tags
1469         rm -f $@; \
1470         $(call xtags,ctags)
1471 endef
1472
1473 tags: FORCE
1474         $(call cmd,tags)
1475
1476
1477 # Scripts to check various things for consistency
1478 # ---------------------------------------------------------------------------
1479
1480 includecheck:
1481         find * $(RCS_FIND_IGNORE) \
1482                 -name '*.[hcS]' -type f -print | sort \
1483                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1484
1485 versioncheck:
1486         find * $(RCS_FIND_IGNORE) \
1487                 -name '*.[hcS]' -type f -print | sort \
1488                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1489
1490 namespacecheck:
1491         $(PERL) $(srctree)/scripts/namespace.pl
1492
1493 export_report:
1494         $(PERL) $(srctree)/scripts/export_report.pl
1495
1496 endif #ifeq ($(config-targets),1)
1497 endif #ifeq ($(mixed-targets),1)
1498
1499 PHONY += checkstack kernelrelease kernelversion
1500
1501 # UML needs a little special treatment here.  It wants to use the host
1502 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1503 # else wants $(ARCH), including people doing cross-builds, which means
1504 # that $(SUBARCH) doesn't work here.
1505 ifeq ($(ARCH), um)
1506 CHECKSTACK_ARCH := $(SUBARCH)
1507 else
1508 CHECKSTACK_ARCH := $(ARCH)
1509 endif
1510 checkstack:
1511         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1512         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1513
1514 kernelrelease:
1515         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1516         $(error kernelrelease not valid - run 'make prepare' to update it))
1517 kernelversion:
1518         @echo $(KERNELVERSION)
1519
1520 # Single targets
1521 # ---------------------------------------------------------------------------
1522 # Single targets are compatible with:
1523 # - build with mixed source and output
1524 # - build with separate output dir 'make O=...'
1525 # - external modules
1526 #
1527 #  target-dir => where to store outputfile
1528 #  build-dir  => directory in kernel source tree to use
1529
1530 ifeq ($(KBUILD_EXTMOD),)
1531         build-dir  = $(patsubst %/,%,$(dir $@))
1532         target-dir = $(dir $@)
1533 else
1534         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1535         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1536         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1537 endif
1538
1539 %.s: %.c prepare scripts FORCE
1540         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1541 %.i: %.c prepare scripts FORCE
1542         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1543 %.o: %.c prepare scripts FORCE
1544         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1545 %.lst: %.c prepare scripts FORCE
1546         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1547 %.s: %.S prepare scripts FORCE
1548         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1549 %.o: %.S prepare scripts FORCE
1550         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1551 %.symtypes: %.c prepare scripts FORCE
1552         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1553
1554 # Modules
1555 / %/: prepare scripts FORCE
1556         $(cmd_crmodverdir)
1557         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1558         $(build)=$(build-dir)
1559 %.ko: prepare scripts FORCE
1560         $(cmd_crmodverdir)
1561         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1562         $(build)=$(build-dir) $(@:.ko=.o)
1563         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1564
1565 # FIXME Should go into a make.lib or something
1566 # ===========================================================================
1567
1568 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1569       cmd_rmdirs = rm -rf $(rm-dirs)
1570
1571 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1572       cmd_rmfiles = rm -f $(rm-files)
1573
1574 # Run depmod only if we have System.map and depmod is executable
1575 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1576       cmd_depmod = \
1577         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1578                 $(DEPMOD) -ae -F System.map                                     \
1579                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1580                 $(KERNELRELEASE);                                               \
1581         fi
1582
1583 # Create temporary dir for module support files
1584 # clean it up only when building all modules
1585 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1586                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1587
1588 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1589           $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1590           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1591
1592 quiet_cmd_as_o_S = AS      $@
1593 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1594
1595 # read all saved command lines
1596
1597 targets := $(wildcard $(sort $(targets)))
1598 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1599
1600 ifneq ($(cmd_files),)
1601   $(cmd_files): ;       # Do not try to update included dependency files
1602   include $(cmd_files)
1603 endif
1604
1605 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1606 # Usage:
1607 # $(Q)$(MAKE) $(clean)=dir
1608 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1609
1610 endif   # skip-makefile
1611
1612 PHONY += FORCE
1613 FORCE:
1614
1615 # Declare the contents of the .PHONY variable as phony.  We keep that
1616 # information in a variable se we can use it in if_changed and friends.
1617 .PHONY: $(PHONY)