Makefile

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