Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 28
   4 EXTRAVERSION = -rc1
   5 NAME = Killer Bat of Doom
   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 # We are using a recursive build, so we need to do a little thinking
  20 # to get the ordering right.
  21 #
  22 # Most importantly: sub-Makefiles should only ever modify files in
  23 # their own directory. If in some directory we have a dependency on
  24 # a file in another dir (which doesn't happen often, but it's often
  25 # unavoidable when linking the built-in.o targets which finally
  26 # turn into vmlinux), we will call a sub make in that other dir, and
  27 # after that we are sure that everything which is in that other dir
  28 # is now up to date.
  29 #
  30 # The only cases where we need to modify files which have global
  31 # effects are thus separated out and done before the recursive
  32 # descending is started. They are now explicitly listed as the
  33 # prepare rule.
  34
  35 # To put more focus on warnings, be less verbose as default
  36 # Use 'make V=1' to see the full commands
  37
  38 ifdef V
  39   ifeq ("$(origin V)", "command line")
  40     KBUILD_VERBOSE = $(V)
  41   endif
  42 endif
  43 ifndef KBUILD_VERBOSE
  44   KBUILD_VERBOSE = 0
  45 endif
  46
  47 # Call a source code checker (by default, "sparse") as part of the
  48 # C compilation.
  49 #
  50 # Use 'make C=1' to enable checking of only re-compiled files.
  51 # Use 'make C=2' to enable checking of *all* source files, regardless
  52 # of whether they are re-compiled or not.
  53 #
  54 # See the file "Documentation/sparse.txt" for more details, including
  55 # where to get the "sparse" utility.
  56
  57 ifdef C
  58   ifeq ("$(origin C)", "command line")
  59     KBUILD_CHECKSRC = $(C)
  60   endif
  61 endif
  62 ifndef KBUILD_CHECKSRC
  63   KBUILD_CHECKSRC = 0
  64 endif
  65
  66 # Use make M=dir to specify directory of external module to build
  67 # Old syntax make ... SUBDIRS=$PWD is still supported
  68 # Setting the environment variable KBUILD_EXTMOD take precedence
  69 ifdef SUBDIRS
  70   KBUILD_EXTMOD ?= $(SUBDIRS)
  71 endif
  72 ifdef M
  73   ifeq ("$(origin M)", "command line")
  74     KBUILD_EXTMOD := $(M)
  75   endif
  76 endif
  77
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifdef O
 102   ifeq ("$(origin O)", "command line")
 103     KBUILD_OUTPUT := $(O)
 104   endif
 105 endif
 106
 107 # That's our default target when none is given on the command line
 108 PHONY := _all
 109 _all:
 110
 111 # Cancel implicit rules on top Makefile
 112 $(CURDIR)/Makefile Makefile: ;
 113
 114 ifneq ($(KBUILD_OUTPUT),)
 115 # Invoke a second make in the output directory, passing relevant variables
 116 # check that the output directory actually exists
 117 saved-output := $(KBUILD_OUTPUT)
 118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119 $(if $(KBUILD_OUTPUT),, \
 120      $(error output directory "$(saved-output)" does not exist))
 121
 122 PHONY += $(MAKECMDGOALS) sub-make
 123
 124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125         $(Q)@:
 126
 127 sub-make: FORCE
 128         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129         KBUILD_SRC=$(CURDIR) \
 130         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131         $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133 # Leave processing to above invocation of make
 134 skip-makefile := 1
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136 endif # ifeq ($(KBUILD_SRC),)
 137
 138 # We process the rest of the Makefile if this is the final invocation of make
 139 ifeq ($(skip-makefile),)
 140
 141 # If building an external module we do not care about the all: rule
 142 # but instead _all depend on modules
 143 PHONY += all
 144 ifeq ($(KBUILD_EXTMOD),)
 145 _all: all
 146 else
 147 _all: modules
 148 endif
 149
 150 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151 TOPDIR          := $(srctree)
 152 # FIXME - TOPDIR is obsolete, use srctree/objtree
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH TOPDIR
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                   -e s/sh.*/sh/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192
 193 export KBUILD_BUILDHOST := $(SUBARCH)
 194 ARCH            ?= mips
 195 CROSS_COMPILE   ?=
 196
 197 # Architecture as present in compile.h
 198 UTS_MACHINE     := $(ARCH)
 199 SRCARCH         := $(ARCH)
 200
 201 # Additional ARCH settings for x86
 202 ifeq ($(ARCH),i386)
 203         SRCARCH := x86
 204 endif
 205 ifeq ($(ARCH),x86_64)
 206         SRCARCH := x86
 207 endif
 208
 209 # Where to locate arch specific headers
 210 ifeq ($(ARCH),sparc64)
 211        hdr-arch  := sparc
 212 else
 213        hdr-arch  := $(SRCARCH)
 214 endif
 215
 216 KCONFIG_CONFIG  ?= .config
 217
 218 # SHELL used by kbuild
 219 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 220           else if [ -x /bin/bash ]; then echo /bin/bash; \
 221           else echo sh; fi ; fi)
 222
 223 HOSTCC       = gcc
 224 HOSTCXX      = g++
 225 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 226 HOSTCXXFLAGS = -O2
 227
 228 # Decide whether to build built-in, modular, or both.
 229 # Normally, just do built-in.
 230
 231 KBUILD_MODULES :=
 232 KBUILD_BUILTIN := 1
 233
 234 #       If we have only "make modules", don't compile built-in objects.
 235 #       When we're building modules with modversions, we need to consider
 236 #       the built-in objects during the descend as well, in order to
 237 #       make sure the checksums are up to date before we record them.
 238
 239 ifeq ($(MAKECMDGOALS),modules)
 240   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 241 endif
 242
 243 #       If we have "make <whatever> modules", compile modules
 244 #       in addition to whatever we do anyway.
 245 #       Just "make" or "make all" shall build modules as well
 246
 247 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 248   KBUILD_MODULES := 1
 249 endif
 250
 251 ifeq ($(MAKECMDGOALS),)
 252   KBUILD_MODULES := 1
 253 endif
 254
 255 export KBUILD_MODULES KBUILD_BUILTIN
 256 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 257
 258 # Beautify output
 259 # ---------------------------------------------------------------------------
 260 #
 261 # Normally, we echo the whole command before executing it. By making
 262 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 263 # $(quiet) to choose other forms of output instead, e.g.
 264 #
 265 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 266 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 267 #
 268 # If $(quiet) is empty, the whole command will be printed.
 269 # If it is set to "quiet_", only the short version will be printed.
 270 # If it is set to "silent_", nothing will be printed at all, since
 271 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 272 #
 273 # A simple variant is to prefix commands with $(Q) - that's useful
 274 # for commands that shall be hidden in non-verbose mode.
 275 #
 276 #       $(Q)ln $@ :<
 277 #
 278 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 279 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 280
 281 ifeq ($(KBUILD_VERBOSE),1)
 282   quiet =
 283   Q =
 284 else
 285   quiet=quiet_
 286   Q = @
 287 endif
 288
 289 # If the user is running make -s (silent mode), suppress echoing of
 290 # commands
 291
 292 ifneq ($(findstring s,$(MAKEFLAGS)),)
 293   quiet=silent_
 294 endif
 295
 296 export quiet Q KBUILD_VERBOSE
 297
 298
 299 # Look for make include files relative to root of kernel src
 300 MAKEFLAGS += --include-dir=$(srctree)
 301
 302 # We need some generic definitions (do not try to remake the file).
 303 $(srctree)/scripts/Kbuild.include: ;
 304 include $(srctree)/scripts/Kbuild.include
 305
 306 # Make variables (CC, etc...)
 307
 308 AS              = $(CROSS_COMPILE)as
 309 LD              = $(CROSS_COMPILE)ld
 310 CC              = $(CROSS_COMPILE)gcc
 311 CPP             = $(CC) -E
 312 AR              = $(CROSS_COMPILE)ar
 313 NM              = $(CROSS_COMPILE)nm
 314 STRIP           = $(CROSS_COMPILE)strip
 315 OBJCOPY         = $(CROSS_COMPILE)objcopy
 316 OBJDUMP         = $(CROSS_COMPILE)objdump
 317 AWK             = awk
 318 GENKSYMS        = scripts/genksyms/genksyms
 319 DEPMOD          = /sbin/depmod
 320 KALLSYMS        = scripts/kallsyms
 321 PERL            = perl
 322 CHECK           = sparse
 323
 324 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 325 MODFLAGS        = -DMODULE
 326 CFLAGS_MODULE   = $(MODFLAGS)
 327 AFLAGS_MODULE   = $(MODFLAGS)
 328 LDFLAGS_MODULE  =
 329 CFLAGS_KERNEL   =
 330 AFLAGS_KERNEL   =
 331
 332
 333 # Use LINUXINCLUDE when you must reference the include/ directory.
 334 # Needed to be compatible with the O= option
 335 LINUXINCLUDE    := -Iinclude \
 336                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 337                    -I$(srctree)/arch/$(hdr-arch)/include               \
 338                    -include include/linux/autoconf.h
 339
 340 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 341
 342 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 343                    -fno-strict-aliasing -fno-common \
 344                    -Werror-implicit-function-declaration
 345 KBUILD_AFLAGS   := -D__ASSEMBLY__
 346
 347 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 348 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 349 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 350
 351 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 352 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 353 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 354 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 355
 356 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 357 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 358 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 359
 360 # When compiling out-of-tree modules, put MODVERDIR in the module
 361 # tree rather than in the kernel tree. The kernel tree might
 362 # even be read-only.
 363 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 364
 365 # Files to ignore in find ... statements
 366
 367 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
 368 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 369
 370 # ===========================================================================
 371 # Rules shared between *config targets and build targets
 372
 373 # Basic helpers built in scripts/
 374 PHONY += scripts_basic
 375 scripts_basic:
 376         $(Q)$(MAKE) $(build)=scripts/basic
 377
 378 # To avoid any implicit rule to kick in, define an empty command.
 379 scripts/basic/%: scripts_basic ;
 380
 381 PHONY += outputmakefile
 382 # outputmakefile generates a Makefile in the output directory, if using a
 383 # separate output directory. This allows convenient use of make in the
 384 # output directory.
 385 outputmakefile:
 386 ifneq ($(KBUILD_SRC),)
 387         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 388             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 389 endif
 390
 391 # To make sure we do not include .config for any of the *config targets
 392 # catch them early, and hand them over to scripts/kconfig/Makefile
 393 # It is allowed to specify more targets when calling make, including
 394 # mixing *config targets and build targets.
 395 # For example 'make oldconfig all'.
 396 # Detect when mixed targets is specified, and make a second invocation
 397 # of make so .config is not included in this case either (for *config).
 398
 399 no-dot-config-targets := clean mrproper distclean \
 400                          cscope TAGS tags help %docs check% \
 401                          include/linux/version.h headers_% \
 402                          kernelrelease kernelversion
 403
 404 config-targets := 0
 405 mixed-targets  := 0
 406 dot-config     := 1
 407
 408 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 409         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 410                 dot-config := 0
 411         endif
 412 endif
 413
 414 ifeq ($(KBUILD_EXTMOD),)
 415         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 416                 config-targets := 1
 417                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 418                         mixed-targets := 1
 419                 endif
 420         endif
 421 endif
 422
 423 ifeq ($(mixed-targets),1)
 424 # ===========================================================================
 425 # We're called with mixed targets (*config and build targets).
 426 # Handle them one by one.
 427
 428 %:: FORCE
 429         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 430
 431 else
 432 ifeq ($(config-targets),1)
 433 # ===========================================================================
 434 # *config targets only - make sure prerequisites are updated, and descend
 435 # in scripts/kconfig to make the *config target
 436
 437 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 438 # KBUILD_DEFCONFIG may point out an alternative default configuration
 439 # used for 'make defconfig'
 440 include $(srctree)/arch/$(SRCARCH)/Makefile
 441 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 442
 443 config %config: scripts_basic outputmakefile FORCE
 444         $(Q)mkdir -p include/linux include/config
 445         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 446
 447 else
 448 # ===========================================================================
 449 # Build targets only - this includes vmlinux, arch specific targets, clean
 450 # targets and others. In general all targets except *config targets.
 451
 452 ifeq ($(KBUILD_EXTMOD),)
 453 # Additional helpers built in scripts/
 454 # Carefully list dependencies so we do not try to build scripts twice
 455 # in parallel
 456 PHONY += scripts
 457 scripts: scripts_basic include/config/auto.conf
 458         $(Q)$(MAKE) $(build)=$(@)
 459
 460 # Objects we will link into vmlinux / subdirs we need to visit
 461 init-y          := init/
 462 drivers-y       := drivers/ sound/ firmware/
 463 net-y           := net/
 464 libs-y          := lib/
 465 core-y          := usr/
 466 endif # KBUILD_EXTMOD
 467
 468 ifeq ($(dot-config),1)
 469 # Read in config
 470 -include include/config/auto.conf
 471
 472 ifeq ($(KBUILD_EXTMOD),)
 473 # Read in dependencies to all Kconfig* files, make sure to run
 474 # oldconfig if changes are detected.
 475 -include include/config/auto.conf.cmd
 476
 477 # To avoid any implicit rule to kick in, define an empty command
 478 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 479
 480 # If .config is newer than include/config/auto.conf, someone tinkered
 481 # with it and forgot to run make oldconfig.
 482 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 483 # we execute the config step to be sure to catch updated Kconfig files
 484 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 485         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 486 else
 487 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 488 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 489 PHONY += include/config/auto.conf
 490
 491 include/config/auto.conf:
 492         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 493         echo;                                                           \
 494         echo "  ERROR: Kernel configuration is invalid.";               \
 495         echo "         include/linux/autoconf.h or $@ are missing.";    \
 496         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 497         echo;                                                           \
 498         /bin/false)
 499
 500 endif # KBUILD_EXTMOD
 501
 502 else
 503 # Dummy target needed, because used as prerequisite
 504 include/config/auto.conf: ;
 505 endif # $(dot-config)
 506
 507 # The all: target is the default when no target is given on the
 508 # command line.
 509 # This allow a user to issue only 'make' to build a kernel including modules
 510 # Defaults vmlinux but it is usually overridden in the arch makefile
 511 all: vmlinux
 512
 513 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 514 KBUILD_CFLAGS   += -Os
 515 else
 516 KBUILD_CFLAGS   += -O2
 517 endif
 518
 519 include $(srctree)/arch/$(SRCARCH)/Makefile
 520
 521 ifneq (CONFIG_FRAME_WARN,0)
 522 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 523 endif
 524
 525 # Force gcc to behave correct even for buggy distributions
 526 # Arch Makefiles may override this setting
 527 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 528
 529 ifdef CONFIG_FRAME_POINTER
 530 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 531 else
 532 KBUILD_CFLAGS   += -fomit-frame-pointer
 533 endif
 534
 535 ifdef CONFIG_DEBUG_INFO
 536 KBUILD_CFLAGS   += -g
 537 KBUILD_AFLAGS   += -gdwarf-2
 538 endif
 539
 540 ifdef CONFIG_FTRACE
 541 KBUILD_CFLAGS   += -pg
 542 endif
 543
 544 # We trigger additional mismatches with less inlining
 545 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 546 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 547 endif
 548
 549 # arch Makefile may override CC so keep this after arch Makefile is included
 550 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 551 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 552
 553 # warn about C99 declaration after statement
 554 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 555
 556 # disable pointer signed / unsigned warnings in gcc 4.0
 557 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 558
 559 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 560 # But warn user when we do so
 561 warn-assign = \
 562 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 563
 564 ifneq ($(KCPPFLAGS),)
 565         $(call warn-assign,CPPFLAGS)
 566         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 567 endif
 568 ifneq ($(KAFLAGS),)
 569         $(call warn-assign,AFLAGS)
 570         KBUILD_AFLAGS += $(KAFLAGS)
 571 endif
 572 ifneq ($(KCFLAGS),)
 573         $(call warn-assign,CFLAGS)
 574         KBUILD_CFLAGS += $(KCFLAGS)
 575 endif
 576
 577 # Use --build-id when available.
 578 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 579                               $(call ld-option, -Wl$(comma)--build-id,))
 580 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 581 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 582
 583 # Default kernel image to build when no specific target is given.
 584 # KBUILD_IMAGE may be overruled on the command line or
 585 # set in the environment
 586 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 587 # this default value
 588 export KBUILD_IMAGE ?= vmlinux
 589
 590 #
 591 # INSTALL_PATH specifies where to place the updated kernel and system map
 592 # images. Default is /boot, but you can set it to other values
 593 export  INSTALL_PATH ?= /boot
 594
 595 #
 596 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 597 # relocations required by build roots.  This is not defined in the
 598 # makefile but the argument can be passed to make if needed.
 599 #
 600
 601 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 602 export MODLIB
 603
 604 #
 605 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 606 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 607 #  the default option --strip-debug will be used.  Otherwise,
 608 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 609
 610 ifdef INSTALL_MOD_STRIP
 611 ifeq ($(INSTALL_MOD_STRIP),1)
 612 mod_strip_cmd = $(STRIP) --strip-debug
 613 else
 614 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 615 endif # INSTALL_MOD_STRIP=1
 616 else
 617 mod_strip_cmd = true
 618 endif # INSTALL_MOD_STRIP
 619 export mod_strip_cmd
 620
 621
 622 ifeq ($(KBUILD_EXTMOD),)
 623 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 624
 625 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 626                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 627                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 628
 629 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 630                      $(init-n) $(init-) \
 631                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 632                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 633
 634 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 635 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 636 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 637 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 638 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 639 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 640 libs-y          := $(libs-y1) $(libs-y2)
 641
 642 # Build vmlinux
 643 # ---------------------------------------------------------------------------
 644 # vmlinux is built from the objects selected by $(vmlinux-init) and
 645 # $(vmlinux-main). Most are built-in.o files from top-level directories
 646 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 647 # Ordering when linking is important, and $(vmlinux-init) must be first.
 648 #
 649 # vmlinux
 650 #   ^
 651 #   |
 652 #   +-< $(vmlinux-init)
 653 #   |   +--< init/version.o + more
 654 #   |
 655 #   +--< $(vmlinux-main)
 656 #   |    +--< driver/built-in.o mm/built-in.o + more
 657 #   |
 658 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 659 #
 660 # vmlinux version (uname -v) cannot be updated during normal
 661 # descending-into-subdirs phase since we do not yet know if we need to
 662 # update vmlinux.
 663 # Therefore this step is delayed until just before final link of vmlinux -
 664 # except in the kallsyms case where it is done just before adding the
 665 # symbols to the kernel.
 666 #
 667 # System.map is generated to document addresses of all kernel symbols
 668
 669 vmlinux-init := $(head-y) $(init-y)
 670 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 671 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 672 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 673 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 674
 675 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 676 # May be overridden by arch/$(ARCH)/Makefile
 677 quiet_cmd_vmlinux__ ?= LD      $@
 678       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 679       -T $(vmlinux-lds) $(vmlinux-init)                          \
 680       --start-group $(vmlinux-main) --end-group                  \
 681       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 682
 683 # Generate new vmlinux version
 684 quiet_cmd_vmlinux_version = GEN     .version
 685       cmd_vmlinux_version = set -e;                     \
 686         if [ ! -r .version ]; then                      \
 687           rm -f .version;                               \
 688           echo 1 >.version;                             \
 689         else                                            \
 690           mv .version .old_version;                     \
 691           expr 0$$(cat .old_version) + 1 >.version;     \
 692         fi;                                             \
 693         $(MAKE) $(build)=init
 694
 695 # Generate System.map
 696 quiet_cmd_sysmap = SYSMAP
 697       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 698
 699 # Link of vmlinux
 700 # If CONFIG_KALLSYMS is set .version is already updated
 701 # Generate System.map and verify that the content is consistent
 702 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 703 # First command is ':' to allow us to use + in front of the rule
 704 define rule_vmlinux__
 705         :
 706         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 707
 708         $(call cmd,vmlinux__)
 709         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 710
 711         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 712           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 713         $(cmd_sysmap) $@ System.map;                                         \
 714         if [ $$? -ne 0 ]; then                                               \
 715                 rm -f $@;                                                    \
 716                 /bin/false;                                                  \
 717         fi;
 718         $(verify_kallsyms)
 719 endef
 720
 721
 722 ifdef CONFIG_KALLSYMS
 723 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 724 # It's a three stage process:
 725 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 726 #   empty
 727 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 728 #   the right size - vmlinux version (uname -v) is updated during this step
 729 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 730 #   but due to the added section, some addresses have shifted.
 731 #   From here, we generate a correct .tmp_kallsyms2.o
 732 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 733 # o Verify that the System.map from vmlinux matches the map from
 734 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 735 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 736 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 737 #   temporary bypass to allow the kernel to be built while the
 738 #   maintainers work out what went wrong with kallsyms.
 739
 740 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 741 last_kallsyms := 3
 742 else
 743 last_kallsyms := 2
 744 endif
 745
 746 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 747
 748 define verify_kallsyms
 749         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 750           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 751           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 752         $(Q)cmp -s System.map .tmp_System.map ||                             \
 753                 (echo Inconsistent kallsyms data;                            \
 754                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 755                  rm .tmp_kallsyms* ; /bin/false )
 756 endef
 757
 758 # Update vmlinux version before link
 759 # Use + in front of this rule to silent warning about make -j1
 760 # First command is ':' to allow us to use + in front of this rule
 761 cmd_ksym_ld = $(cmd_vmlinux__)
 762 define rule_ksym_ld
 763         :
 764         +$(call cmd,vmlinux_version)
 765         $(call cmd,vmlinux__)
 766         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 767 endef
 768
 769 # Generate .S file with all kernel symbols
 770 quiet_cmd_kallsyms = KSYM    $@
 771       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 772                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 773
 774 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 775         $(call if_changed_dep,as_o_S)
 776
 777 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 778         $(call cmd,kallsyms)
 779
 780 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 781 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 782         $(call if_changed_rule,ksym_ld)
 783
 784 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 785         $(call if_changed,vmlinux__)
 786
 787 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 788         $(call if_changed,vmlinux__)
 789
 790 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 791 $(KALLSYMS): scripts ;
 792
 793 # Generate some data for debugging strange kallsyms problems
 794 debug_kallsyms: .tmp_map$(last_kallsyms)
 795
 796 .tmp_map%: .tmp_vmlinux% FORCE
 797         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 798
 799 .tmp_map3: .tmp_map2
 800
 801 .tmp_map2: .tmp_map1
 802
 803 endif # ifdef CONFIG_KALLSYMS
 804
 805 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 806 # relevant sections renamed as per the linker script.
 807 quiet_cmd_vmlinux-modpost = LD      $@
 808       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 809          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 810          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 811 define rule_vmlinux-modpost
 812         :
 813         +$(call cmd,vmlinux-modpost)
 814         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 815         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 816 endef
 817
 818 # vmlinux image - including updated kernel symbols
 819 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 820 ifdef CONFIG_HEADERS_CHECK
 821         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 822 endif
 823 ifdef CONFIG_SAMPLES
 824         $(Q)$(MAKE) $(build)=samples
 825 endif
 826 ifdef CONFIG_BUILD_DOCSRC
 827         $(Q)$(MAKE) $(build)=Documentation
 828 endif
 829         $(call vmlinux-modpost)
 830         $(call if_changed_rule,vmlinux__)
 831         $(Q)rm -f .old_version
 832
 833 # build vmlinux.o first to catch section mismatch errors early
 834 ifdef CONFIG_KALLSYMS
 835 .tmp_vmlinux1: vmlinux.o
 836 endif
 837
 838 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 839 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 840         $(call if_changed_rule,vmlinux-modpost)
 841
 842 # The actual objects are generated when descending,
 843 # make sure no implicit rule kicks in
 844 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 845
 846 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 847 # Preset locale variables to speed up the build process. Limit locale
 848 # tweaks to this spot to avoid wrong language settings when running
 849 # make menuconfig etc.
 850 # Error messages still appears in the original language
 851
 852 PHONY += $(vmlinux-dirs)
 853 $(vmlinux-dirs): prepare scripts
 854         $(Q)$(MAKE) $(build)=$@
 855
 856 # Build the kernel release string
 857 #
 858 # The KERNELRELEASE value built here is stored in the file
 859 # include/config/kernel.release, and is used when executing several
 860 # make targets, such as "make install" or "make modules_install."
 861 #
 862 # The eventual kernel release string consists of the following fields,
 863 # shown in a hierarchical format to show how smaller parts are concatenated
 864 # to form the larger and final value, with values coming from places like
 865 # the Makefile, kernel config options, make command line options and/or
 866 # SCM tag information.
 867 #
 868 #       $(KERNELVERSION)
 869 #         $(VERSION)                    eg, 2
 870 #         $(PATCHLEVEL)                 eg, 6
 871 #         $(SUBLEVEL)                   eg, 18
 872 #         $(EXTRAVERSION)               eg, -rc6
 873 #       $(localver-full)
 874 #         $(localver)
 875 #           localversion*               (files without backups, containing '~')
 876 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 877 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 878 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 879 #           $(LOCALVERSION)             (from make command line if provided)
 880 #
 881 #  Note how the final $(localver-auto) string is included *only* if the
 882 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 883 # moment, only git is supported but other SCMs can edit the script
 884 # scripts/setlocalversion and add the appropriate checks as needed.
 885
 886 pattern = ".*/localversion[^~]*"
 887 string  = $(shell cat /dev/null \
 888            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 889
 890 localver = $(subst $(space),, $(string) \
 891                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 892
 893 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 894 # and if the SCM is know a tag from the SCM is appended.
 895 # The appended tag is determined by the SCM used.
 896 #
 897 # Currently, only git is supported.
 898 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 899 # checks as needed.
 900 ifdef CONFIG_LOCALVERSION_AUTO
 901         _localver-auto = $(shell $(CONFIG_SHELL) \
 902                           $(srctree)/scripts/setlocalversion $(srctree))
 903         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 904 endif
 905
 906 localver-full = $(localver)$(localver-auto)
 907
 908 # Store (new) KERNELRELASE string in include/config/kernel.release
 909 kernelrelease = $(KERNELVERSION)$(localver-full)
 910 include/config/kernel.release: include/config/auto.conf FORCE
 911         $(Q)rm -f $@
 912         $(Q)echo $(kernelrelease) > $@
 913
 914
 915 # Things we need to do before we recursively start building the kernel
 916 # or the modules are listed in "prepare".
 917 # A multi level approach is used. prepareN is processed before prepareN-1.
 918 # archprepare is used in arch Makefiles and when processed asm symlink,
 919 # version.h and scripts_basic is processed / created.
 920
 921 # Listed in dependency order
 922 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 923
 924 # prepare3 is used to check if we are building in a separate output directory,
 925 # and if so do:
 926 # 1) Check that make has not been executed in the kernel src $(srctree)
 927 # 2) Create the include2 directory, used for the second asm symlink
 928 prepare3: include/config/kernel.release
 929 ifneq ($(KBUILD_SRC),)
 930         @echo '  Using $(srctree) as source for kernel'
 931         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 932                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 933                 echo "  in the '$(srctree)' directory.";\
 934                 /bin/false; \
 935         fi;
 936         $(Q)if [ ! -d include2 ]; then                                  \
 937             mkdir -p include2;                                          \
 938             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 939         fi
 940 endif
 941
 942 # prepare2 creates a makefile if using a separate output directory
 943 prepare2: prepare3 outputmakefile
 944
 945 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 946                    include/asm include/config/auto.conf
 947         $(cmd_crmodverdir)
 948
 949 archprepare: prepare1 scripts_basic
 950
 951 prepare0: archprepare FORCE
 952         $(Q)$(MAKE) $(build)=.
 953         $(Q)$(MAKE) $(build)=. missing-syscalls
 954
 955 # All the preparing..
 956 prepare: prepare0
 957
 958 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 959 # done in arch/$(ARCH)/kernel/Makefile
 960
 961 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 962
 963 # The asm symlink changes when $(ARCH) changes.
 964 # Detect this and ask user to run make mrproper
 965 define check-symlink
 966         set -e;                                                            \
 967         if [ -L include/asm ]; then                                        \
 968                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 969                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
 970                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 971                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 972                         exit 1;                                            \
 973                 fi;                                                        \
 974         fi
 975 endef
 976
 977 # We create the target directory of the symlink if it does
 978 # not exist so the test in chack-symlink works and we have a
 979 # directory for generated filesas used by some architectures.
 980 define create-symlink
 981         if [ ! -L include/asm ]; then                                      \
 982                         echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';     \
 983                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
 984                                 mkdir -p include/asm-$(SRCARCH);           \
 985                         fi;                                                \
 986                         ln -fsn asm-$(SRCARCH) $@;                         \
 987         fi
 988 endef
 989
 990 include/asm: FORCE
 991         $(Q)$(check-symlink)
 992         $(Q)$(create-symlink)
 993
 994 # Generate some files
 995 # ---------------------------------------------------------------------------
 996
 997 # KERNELRELEASE can change from a few different places, meaning version.h
 998 # needs to be updated, so this check is forced on all builds
 999
1000 uts_len := 64
1001 define filechk_utsrelease.h
1002         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1003           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1004           exit 1;                                                         \
1005         fi;                                                               \
1006         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1007 endef
1008
1009 define filechk_version.h
1010         (echo \#define LINUX_VERSION_CODE $(shell                             \
1011         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1012         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1013 endef
1014
1015 include/linux/version.h: $(srctree)/Makefile FORCE
1016         $(call filechk,version.h)
1017
1018 include/linux/utsrelease.h: include/config/kernel.release FORCE
1019         $(call filechk,utsrelease.h)
1020
1021 # ---------------------------------------------------------------------------
1022
1023 PHONY += depend dep
1024 depend dep:
1025         @echo '*** Warning: make $@ is unnecessary now.'
1026
1027 # ---------------------------------------------------------------------------
1028 # Firmware install
1029 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1030 export INSTALL_FW_PATH
1031
1032 PHONY += firmware_install
1033 firmware_install: FORCE
1034         @mkdir -p $(objtree)/firmware
1035         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1036
1037 # ---------------------------------------------------------------------------
1038 # Kernel headers
1039
1040 #Default location for installed headers
1041 export INSTALL_HDR_PATH = $(objtree)/usr
1042
1043 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1044 # Find out where the Kbuild file is located to support
1045 # arch/$(ARCH)/include/asm
1046 hdr-dir = $(strip                                                         \
1047           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1048                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1049
1050 # If we do an all arch process set dst to asm-$(hdr-arch)
1051 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1052
1053 PHONY += __headers
1054 __headers: include/linux/version.h scripts_basic FORCE
1055         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1056
1057 PHONY += headers_install_all
1058 headers_install_all:
1059         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1060
1061 PHONY += headers_install
1062 headers_install: __headers
1063         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1064         $(error Headers not exportable for the $(SRCARCH) architecture))
1065         $(Q)$(MAKE) $(hdr-inst)=include
1066         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1067
1068 PHONY += headers_check_all
1069 headers_check_all: headers_install_all
1070         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1071
1072 PHONY += headers_check
1073 headers_check: headers_install
1074         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1075         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1076
1077 # ---------------------------------------------------------------------------
1078 # Modules
1079
1080 ifdef CONFIG_MODULES
1081
1082 # By default, build modules as well
1083
1084 all: modules
1085
1086 #       Build modules
1087 #
1088 #       A module can be listed more than once in obj-m resulting in
1089 #       duplicate lines in modules.order files.  Those are removed
1090 #       using awk while concatenating to the final file.
1091
1092 PHONY += modules
1093 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1094         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1095         @echo '  Building modules, stage 2.';
1096         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1097         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1098
1099
1100 # Target to prepare building external modules
1101 PHONY += modules_prepare
1102 modules_prepare: prepare scripts
1103
1104 # Target to install modules
1105 PHONY += modules_install
1106 modules_install: _modinst_ _modinst_post
1107
1108 PHONY += _modinst_
1109 _modinst_:
1110         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1111                 echo "Warning: you may need to install module-init-tools"; \
1112                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1113                 sleep 1; \
1114         fi
1115         @rm -rf $(MODLIB)/kernel
1116         @rm -f $(MODLIB)/source
1117         @mkdir -p $(MODLIB)/kernel
1118         @ln -s $(srctree) $(MODLIB)/source
1119         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1120                 rm -f $(MODLIB)/build ; \
1121                 ln -s $(objtree) $(MODLIB)/build ; \
1122         fi
1123         @cp -f $(objtree)/modules.order $(MODLIB)/
1124         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1125
1126 # This depmod is only for convenience to give the initial
1127 # boot a modules.dep even before / is mounted read-write.  However the
1128 # boot script depmod is the master version.
1129 PHONY += _modinst_post
1130 _modinst_post: _modinst_
1131         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1132         $(call cmd,depmod)
1133
1134 else # CONFIG_MODULES
1135
1136 # Modules not configured
1137 # ---------------------------------------------------------------------------
1138
1139 modules modules_install: FORCE
1140         @echo
1141         @echo "The present kernel configuration has modules disabled."
1142         @echo "Type 'make config' and enable loadable module support."
1143         @echo "Then build a kernel with module support enabled."
1144         @echo
1145         @exit 1
1146
1147 endif # CONFIG_MODULES
1148
1149 ###
1150 # Cleaning is done on three levels.
1151 # make clean     Delete most generated files
1152 #                Leave enough to build external modules
1153 # make mrproper  Delete the current configuration, and all generated files
1154 # make distclean Remove editor backup files, patch leftover files and the like
1155
1156 # Directories & files removed with 'make clean'
1157 CLEAN_DIRS  += $(MODVERDIR)
1158 CLEAN_FILES +=  vmlinux System.map \
1159                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1160
1161 # Directories & files removed with 'make mrproper'
1162 MRPROPER_DIRS  += include/config include2 usr/include
1163 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1164                   include/linux/autoconf.h include/linux/version.h      \
1165                   include/linux/utsrelease.h                            \
1166                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1167                   Module.symvers Module.markers tags TAGS cscope*
1168
1169 # clean - Delete most, but leave enough to build external modules
1170 #
1171 clean: rm-dirs  := $(CLEAN_DIRS)
1172 clean: rm-files := $(CLEAN_FILES)
1173 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1174
1175 PHONY += $(clean-dirs) clean archclean
1176 $(clean-dirs):
1177         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1178
1179 clean: archclean $(clean-dirs)
1180         $(call cmd,rmdirs)
1181         $(call cmd,rmfiles)
1182         @find . $(RCS_FIND_IGNORE) \
1183                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1184                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1185                 -o -name '*.symtypes' -o -name 'modules.order' \
1186                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1187                 -type f -print | xargs rm -f
1188
1189 # mrproper - Delete all generated files, including .config
1190 #
1191 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1192 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1193 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1194
1195 PHONY += $(mrproper-dirs) mrproper archmrproper
1196 $(mrproper-dirs):
1197         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1198
1199 mrproper: clean archmrproper $(mrproper-dirs)
1200         $(call cmd,rmdirs)
1201         $(call cmd,rmfiles)
1202
1203 # distclean
1204 #
1205 PHONY += distclean
1206
1207 distclean: mrproper
1208         @find $(srctree) $(RCS_FIND_IGNORE) \
1209                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1210                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1211                 -o -name '.*.rej' -o -size 0 \
1212                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1213                 -type f -print | xargs rm -f
1214
1215
1216 # Packaging of the kernel to various formats
1217 # ---------------------------------------------------------------------------
1218 # rpm target kept for backward compatibility
1219 package-dir     := $(srctree)/scripts/package
1220
1221 %pkg: include/config/kernel.release FORCE
1222         $(Q)$(MAKE) $(build)=$(package-dir) $@
1223 rpm: include/config/kernel.release FORCE
1224         $(Q)$(MAKE) $(build)=$(package-dir) $@
1225
1226
1227 # Brief documentation of the typical targets used
1228 # ---------------------------------------------------------------------------
1229
1230 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1231 boards := $(notdir $(boards))
1232 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1233 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1234
1235 help:
1236         @echo  'Cleaning targets:'
1237         @echo  '  clean           - Remove most generated files but keep the config and'
1238         @echo  '                    enough build support to build external modules'
1239         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1240         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1241         @echo  ''
1242         @echo  'Configuration targets:'
1243         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1244         @echo  ''
1245         @echo  'Other generic targets:'
1246         @echo  '  all             - Build all targets marked with [*]'
1247         @echo  '* vmlinux         - Build the bare kernel'
1248         @echo  '* modules         - Build all modules'
1249         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1250         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1251         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1252         @echo  '  dir/            - Build all files in dir and below'
1253         @echo  '  dir/file.[ois]  - Build specified target only'
1254         @echo  '  dir/file.ko     - Build module including final link'
1255         @echo  '  prepare         - Set up for building external modules'
1256         @echo  '  tags/TAGS       - Generate tags file for editors'
1257         @echo  '  cscope          - Generate cscope index'
1258         @echo  '  kernelrelease   - Output the release version string'
1259         @echo  '  kernelversion   - Output the version stored in Makefile'
1260         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1261          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1262          echo  ''
1263         @echo  'Static analysers'
1264         @echo  '  checkstack      - Generate a list of stack hogs'
1265         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1266         @echo  '  versioncheck    - Sanity check on version.h usage'
1267         @echo  '  includecheck    - Check for duplicate included header files'
1268         @echo  '  export_report   - List the usages of all exported symbols'
1269         @echo  '  headers_check   - Sanity check on exported headers'; \
1270          echo  ''
1271         @echo  'Kernel packaging:'
1272         @$(MAKE) $(build)=$(package-dir) help
1273         @echo  ''
1274         @echo  'Documentation targets:'
1275         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1276         @echo  ''
1277         @echo  'Architecture specific targets ($(SRCARCH)):'
1278         @$(if $(archhelp),$(archhelp),\
1279                 echo '  No architecture specific help defined for $(SRCARCH)')
1280         @echo  ''
1281         @$(if $(boards), \
1282                 $(foreach b, $(boards), \
1283                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1284                 echo '')
1285         @$(if $(board-dirs), \
1286                 $(foreach b, $(board-dirs), \
1287                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1288                 printf "  %-16s - Show all of the above\\n" help-boards; \
1289                 echo '')
1290
1291         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1292         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1293         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1294         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1295         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1296         @echo  ''
1297         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1298         @echo  'For further info see the ./README file'
1299
1300
1301 help-board-dirs := $(addprefix help-,$(board-dirs))
1302
1303 help-boards: $(help-board-dirs)
1304
1305 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1306
1307 $(help-board-dirs): help-%:
1308         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1309         @$(if $(boards-per-dir), \
1310                 $(foreach b, $(boards-per-dir), \
1311                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1312                 echo '')
1313
1314
1315 # Documentation targets
1316 # ---------------------------------------------------------------------------
1317 %docs: scripts_basic FORCE
1318         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1319
1320 else # KBUILD_EXTMOD
1321
1322 ###
1323 # External module support.
1324 # When building external modules the kernel used as basis is considered
1325 # read-only, and no consistency checks are made and the make
1326 # system is not used on the basis kernel. If updates are required
1327 # in the basis kernel ordinary make commands (without M=...) must
1328 # be used.
1329 #
1330 # The following are the only valid targets when building external
1331 # modules.
1332 # make M=dir clean     Delete all automatically generated files
1333 # make M=dir modules   Make all modules in specified dir
1334 # make M=dir           Same as 'make M=dir modules'
1335 # make M=dir modules_install
1336 #                      Install the modules built in the module directory
1337 #                      Assumes install directory is already created
1338
1339 # We are always building modules
1340 KBUILD_MODULES := 1
1341 PHONY += crmodverdir
1342 crmodverdir:
1343         $(cmd_crmodverdir)
1344
1345 PHONY += $(objtree)/Module.symvers
1346 $(objtree)/Module.symvers:
1347         @test -e $(objtree)/Module.symvers || ( \
1348         echo; \
1349         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1350         echo "           is missing; modules will have no dependencies and modversions."; \
1351         echo )
1352
1353 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1354 PHONY += $(module-dirs) modules
1355 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1356         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1357
1358 modules: $(module-dirs)
1359         @echo '  Building modules, stage 2.';
1360         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1361
1362 PHONY += modules_install
1363 modules_install: _emodinst_ _emodinst_post
1364
1365 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1366 PHONY += _emodinst_
1367 _emodinst_:
1368         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1369         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1370
1371 PHONY += _emodinst_post
1372 _emodinst_post: _emodinst_
1373         $(call cmd,depmod)
1374
1375 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1376
1377 PHONY += $(clean-dirs) clean
1378 $(clean-dirs):
1379         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1380
1381 clean:  rm-dirs := $(MODVERDIR)
1382 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1383 clean: $(clean-dirs)
1384         $(call cmd,rmdirs)
1385         $(call cmd,rmfiles)
1386         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1387                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1388                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1389                 -type f -print | xargs rm -f
1390
1391 help:
1392         @echo  '  Building external modules.'
1393         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1394         @echo  ''
1395         @echo  '  modules         - default target, build the module(s)'
1396         @echo  '  modules_install - install the module'
1397         @echo  '  clean           - remove generated files in module directory only'
1398         @echo  ''
1399
1400 # Dummies...
1401 PHONY += prepare scripts
1402 prepare: ;
1403 scripts: ;
1404 endif # KBUILD_EXTMOD
1405
1406 # Generate tags for editors
1407 # ---------------------------------------------------------------------------
1408
1409 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1410 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1411 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1412
1413 ifeq ($(src),$(obj))
1414 __srctree =
1415 else
1416 __srctree = $(srctree)/
1417 endif
1418
1419 ifeq ($(ALLSOURCE_ARCHS),)
1420 ifeq ($(ARCH),um)
1421 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1422 else
1423 ALLINCLUDE_ARCHS := $(SRCARCH)
1424 endif
1425 else
1426 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1427 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1428 endif
1429
1430 ALLSOURCE_ARCHS := $(SRCARCH)
1431
1432 define find-sources
1433         ( for arch in $(ALLSOURCE_ARCHS) ; do \
1434                find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1435                     -name $1 -print; \
1436           done ; \
1437           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1438                -name $1 -print; \
1439           find $(__srctree)include $(RCS_FIND_IGNORE) \
1440                \( -name config -o -name 'asm-*' \) -prune \
1441                -o -name $1 -print; \
1442           for arch in $(ALLINCLUDE_ARCHS) ; do \
1443                test -e $(__srctree)include/asm-$${arch} && \
1444                  find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1445                     -name $1 -print; \
1446                test -e $(__srctree)arch/$${arch}/include/asm && \
1447                  find $(__srctree)arch/$${arch}/include/asm $(RCS_FIND_IGNORE) \
1448                     -name $1 -print; \
1449           done ; \
1450           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1451                -name $1 -print; \
1452           find $(__srctree) $(RCS_FIND_IGNORE) \
1453                \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1454                -name $1 -print; \
1455           )
1456 endef
1457
1458 define all-sources
1459         $(call find-sources,'*.[chS]')
1460 endef
1461 define all-kconfigs
1462         $(call find-sources,'Kconfig*')
1463 endef
1464 define all-defconfigs
1465         $(call find-sources,'defconfig')
1466 endef
1467
1468 define xtags
1469         if $1 --version 2>&1 | grep -iq exuberant; then \
1470             $(all-sources) | xargs $1 -a \
1471                 -I __initdata,__exitdata,__acquires,__releases \
1472                 -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1473                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1474                 --extra=+f --c-kinds=+px \
1475                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1476             $(all-kconfigs) | xargs $1 -a \
1477                 --langdef=kconfig \
1478                 --language-force=kconfig \
1479                 --regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1480             $(all-defconfigs) | xargs -r $1 -a \
1481                 --langdef=dotconfig \
1482                 --language-force=dotconfig \
1483                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1484         elif $1 --version 2>&1 | grep -iq emacs; then \
1485             $(all-sources) | xargs $1 -a; \
1486             $(all-kconfigs) | xargs $1 -a \
1487                 --regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1488             $(all-defconfigs) | xargs -r $1 -a \
1489                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1490         else \
1491             $(all-sources) | xargs $1 -a; \
1492         fi
1493 endef
1494
1495 quiet_cmd_cscope-file = FILELST cscope.files
1496       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1497
1498 quiet_cmd_cscope = MAKE    cscope.out
1499       cmd_cscope = cscope -b -f cscope.out
1500
1501 cscope: FORCE
1502         $(call cmd,cscope-file)
1503         $(call cmd,cscope)
1504
1505 quiet_cmd_TAGS = MAKE   $@
1506 define cmd_TAGS
1507         rm -f $@; \
1508         $(call xtags,etags)
1509 endef
1510
1511 TAGS: FORCE
1512         $(call cmd,TAGS)
1513
1514 quiet_cmd_tags = MAKE   $@
1515 define cmd_tags
1516         rm -f $@; \
1517         $(call xtags,ctags)
1518 endef
1519
1520 tags: FORCE
1521         $(call cmd,tags)
1522
1523
1524 # Scripts to check various things for consistency
1525 # ---------------------------------------------------------------------------
1526
1527 includecheck:
1528         find * $(RCS_FIND_IGNORE) \
1529                 -name '*.[hcS]' -type f -print | sort \
1530                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1531
1532 versioncheck:
1533         find * $(RCS_FIND_IGNORE) \
1534                 -name '*.[hcS]' -type f -print | sort \
1535                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1536
1537 namespacecheck:
1538         $(PERL) $(srctree)/scripts/namespace.pl
1539
1540 export_report:
1541         $(PERL) $(srctree)/scripts/export_report.pl
1542
1543 endif #ifeq ($(config-targets),1)
1544 endif #ifeq ($(mixed-targets),1)
1545
1546 PHONY += checkstack kernelrelease kernelversion
1547
1548 # UML needs a little special treatment here.  It wants to use the host
1549 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1550 # else wants $(ARCH), including people doing cross-builds, which means
1551 # that $(SUBARCH) doesn't work here.
1552 ifeq ($(ARCH), um)
1553 CHECKSTACK_ARCH := $(SUBARCH)
1554 else
1555 CHECKSTACK_ARCH := $(ARCH)
1556 endif
1557 checkstack:
1558         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1559         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1560
1561 kernelrelease:
1562         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1563         $(error kernelrelease not valid - run 'make prepare' to update it))
1564 kernelversion:
1565         @echo $(KERNELVERSION)
1566
1567 # Single targets
1568 # ---------------------------------------------------------------------------
1569 # Single targets are compatible with:
1570 # - build with mixed source and output
1571 # - build with separate output dir 'make O=...'
1572 # - external modules
1573 #
1574 #  target-dir => where to store outputfile
1575 #  build-dir  => directory in kernel source tree to use
1576
1577 ifeq ($(KBUILD_EXTMOD),)
1578         build-dir  = $(patsubst %/,%,$(dir $@))
1579         target-dir = $(dir $@)
1580 else
1581         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1582         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1583         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1584 endif
1585
1586 %.s: %.c prepare scripts FORCE
1587         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1588 %.i: %.c prepare scripts FORCE
1589         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1590 %.o: %.c prepare scripts FORCE
1591         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1592 %.lst: %.c prepare scripts FORCE
1593         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1594 %.s: %.S prepare scripts FORCE
1595         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1596 %.o: %.S prepare scripts FORCE
1597         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1598 %.symtypes: %.c prepare scripts FORCE
1599         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1600
1601 # Modules
1602 / %/: prepare scripts FORCE
1603         $(cmd_crmodverdir)
1604         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1605         $(build)=$(build-dir)
1606 %.ko: prepare scripts FORCE
1607         $(cmd_crmodverdir)
1608         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1609         $(build)=$(build-dir) $(@:.ko=.o)
1610         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1611
1612 # FIXME Should go into a make.lib or something
1613 # ===========================================================================
1614
1615 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1616       cmd_rmdirs = rm -rf $(rm-dirs)
1617
1618 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1619       cmd_rmfiles = rm -f $(rm-files)
1620
1621 # Run depmod only if we have System.map and depmod is executable
1622 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1623       cmd_depmod = \
1624         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1625                 $(DEPMOD) -ae -F System.map                                     \
1626                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1627                 $(KERNELRELEASE);                                               \
1628         fi
1629
1630 # Create temporary dir for module support files
1631 # clean it up only when building all modules
1632 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1633                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1634
1635 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1636           $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1637           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1638
1639 quiet_cmd_as_o_S = AS      $@
1640 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1641
1642 # read all saved command lines
1643
1644 targets := $(wildcard $(sort $(targets)))
1645 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1646
1647 ifneq ($(cmd_files),)
1648   $(cmd_files): ;       # Do not try to update included dependency files
1649   include $(cmd_files)
1650 endif
1651
1652 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1653 # Usage:
1654 # $(Q)$(MAKE) $(clean)=dir
1655 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1656
1657 endif   # skip-makefile
1658
1659 PHONY += FORCE
1660 FORCE:
1661
1662 # Declare the contents of the .PHONY variable as phony.  We keep that
1663 # information in a variable se we can use it in if_changed and friends.
1664 .PHONY: $(PHONY)