Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 16
   4 EXTRAVERSION =-rc2
   5 NAME=Sliding Snow Leopard
   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 print "Entering directory ..."
  14 MAKEFLAGS += --no-print-directory
  15
  16 # We are using a recursive build, so we need to do a little thinking
  17 # to get the ordering right.
  18 #
  19 # Most importantly: sub-Makefiles should only ever modify files in
  20 # their own directory. If in some directory we have a dependency on
  21 # a file in another dir (which doesn't happen often, but it's often
  22 # unavoidable when linking the built-in.o targets which finally
  23 # turn into vmlinux), we will call a sub make in that other dir, and
  24 # after that we are sure that everything which is in that other dir
  25 # is now up to date.
  26 #
  27 # The only cases where we need to modify files which have global
  28 # effects are thus separated out and done before the recursive
  29 # descending is started. They are now explicitly listed as the
  30 # prepare rule.
  31
  32 # To put more focus on warnings, be less verbose as default
  33 # Use 'make V=1' to see the full commands
  34
  35 ifdef V
  36   ifeq ("$(origin V)", "command line")
  37     KBUILD_VERBOSE = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call sparse as part of compilation of C files
  45 # Use 'make C=1' to enable sparse checking
  46
  47 ifdef C
  48   ifeq ("$(origin C)", "command line")
  49     KBUILD_CHECKSRC = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # Use make M=dir to specify directory of external module to build
  57 # Old syntax make ... SUBDIRS=$PWD is still supported
  58 # Setting the environment variable KBUILD_EXTMOD take precedence
  59 ifdef SUBDIRS
  60   KBUILD_EXTMOD ?= $(SUBDIRS)
  61 endif
  62 ifdef M
  63   ifeq ("$(origin M)", "command line")
  64     KBUILD_EXTMOD := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntaxes are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  82 # variable.
  83
  84
  85 # KBUILD_SRC is set on invocation of make in OBJ directory
  86 # KBUILD_SRC is not intended to be used by the regular user (for now)
  87 ifeq ($(KBUILD_SRC),)
  88
  89 # OK, Make called in directory where kernel src resides
  90 # Do we want to locate output files in a separate directory?
  91 ifdef O
  92   ifeq ("$(origin O)", "command line")
  93     KBUILD_OUTPUT := $(O)
  94   endif
  95 endif
  96
  97 # That's our default target when none is given on the command line
  98 .PHONY: _all
  99 _all:
 100
 101 ifneq ($(KBUILD_OUTPUT),)
 102 # Invoke a second make in the output directory, passing relevant variables
 103 # check that the output directory actually exists
 104 saved-output := $(KBUILD_OUTPUT)
 105 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 106 $(if $(KBUILD_OUTPUT),, \
 107      $(error output directory "$(saved-output)" does not exist))
 108
 109 .PHONY: $(MAKECMDGOALS) cdbuilddir
 110 $(MAKECMDGOALS) _all: cdbuilddir
 111
 112 cdbuilddir:
 113         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 114         KBUILD_SRC=$(CURDIR) \
 115         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $(MAKECMDGOALS)
 116
 117 # Leave processing to above invocation of make
 118 skip-makefile := 1
 119 endif # ifneq ($(KBUILD_OUTPUT),)
 120 endif # ifeq ($(KBUILD_SRC),)
 121
 122 # We process the rest of the Makefile if this is the final invocation of make
 123 ifeq ($(skip-makefile),)
 124
 125 # If building an external module we do not care about the all: rule
 126 # but instead _all depend on modules
 127 .PHONY: all
 128 ifeq ($(KBUILD_EXTMOD),)
 129 _all: all
 130 else
 131 _all: modules
 132 endif
 133
 134 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 135 TOPDIR          := $(srctree)
 136 # FIXME - TOPDIR is obsolete, use srctree/objtree
 137 objtree         := $(CURDIR)
 138 src             := $(srctree)
 139 obj             := $(objtree)
 140
 141 VPATH           := $(srctree)
 142
 143 export srctree objtree VPATH TOPDIR
 144
 145
 146 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 147 # first, and if a usermode build is happening, the "ARCH=um" on the command
 148 # line overrides the setting of ARCH below.  If a native build is happening,
 149 # then ARCH is assigned, getting whatever value it gets normally, and
 150 # SUBARCH is subsequently ignored.
 151
 152 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 153                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 154                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 155                                   -e s/ppc.*/powerpc/ )
 156
 157 # Cross compiling and selecting different set of gcc/bin-utils
 158 # ---------------------------------------------------------------------------
 159 #
 160 # When performing cross compilation for other architectures ARCH shall be set
 161 # to the target architecture. (See arch/* for the possibilities).
 162 # ARCH can be set during invocation of make:
 163 # make ARCH=ia64
 164 # Another way is to have ARCH set in the environment.
 165 # The default ARCH is the host where make is executed.
 166
 167 # CROSS_COMPILE specify the prefix used for all executables used
 168 # during compilation. Only gcc and related bin-utils executables
 169 # are prefixed with $(CROSS_COMPILE).
 170 # CROSS_COMPILE can be set on the command line
 171 # make CROSS_COMPILE=ia64-linux-
 172 # Alternatively CROSS_COMPILE can be set in the environment.
 173 # Default value for CROSS_COMPILE is not to prefix executables
 174 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 175
 176 ARCH            ?= $(SUBARCH)
 177 CROSS_COMPILE   ?=
 178
 179 # Architecture as present in compile.h
 180 UTS_MACHINE := $(ARCH)
 181
 182 # SHELL used by kbuild
 183 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 184           else if [ -x /bin/bash ]; then echo /bin/bash; \
 185           else echo sh; fi ; fi)
 186
 187 HOSTCC          = gcc
 188 HOSTCXX         = g++
 189 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 190 HOSTCXXFLAGS    = -O2
 191
 192 #       Decide whether to build built-in, modular, or both.
 193 #       Normally, just do built-in.
 194
 195 KBUILD_MODULES :=
 196 KBUILD_BUILTIN := 1
 197
 198 #       If we have only "make modules", don't compile built-in objects.
 199 #       When we're building modules with modversions, we need to consider
 200 #       the built-in objects during the descend as well, in order to
 201 #       make sure the checksums are uptodate before we record them.
 202
 203 ifeq ($(MAKECMDGOALS),modules)
 204   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 205 endif
 206
 207 #       If we have "make <whatever> modules", compile modules
 208 #       in addition to whatever we do anyway.
 209 #       Just "make" or "make all" shall build modules as well
 210
 211 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 212   KBUILD_MODULES := 1
 213 endif
 214
 215 ifeq ($(MAKECMDGOALS),)
 216   KBUILD_MODULES := 1
 217 endif
 218
 219 export KBUILD_MODULES KBUILD_BUILTIN
 220 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 221
 222 # Beautify output
 223 # ---------------------------------------------------------------------------
 224 #
 225 # Normally, we echo the whole command before executing it. By making
 226 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 227 # $(quiet) to choose other forms of output instead, e.g.
 228 #
 229 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 230 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 231 #
 232 # If $(quiet) is empty, the whole command will be printed.
 233 # If it is set to "quiet_", only the short version will be printed.
 234 # If it is set to "silent_", nothing wil be printed at all, since
 235 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 236 #
 237 # A simple variant is to prefix commands with $(Q) - that's useful
 238 # for commands that shall be hidden in non-verbose mode.
 239 #
 240 #       $(Q)ln $@ :<
 241 #
 242 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 243 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 244
 245 ifeq ($(KBUILD_VERBOSE),1)
 246   quiet =
 247   Q =
 248 else
 249   quiet=quiet_
 250   Q = @
 251 endif
 252
 253 # If the user is running make -s (silent mode), suppress echoing of
 254 # commands
 255
 256 ifneq ($(findstring s,$(MAKEFLAGS)),)
 257   quiet=silent_
 258 endif
 259
 260 export quiet Q KBUILD_VERBOSE
 261
 262 ######
 263 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
 264 # See documentation in Documentation/kbuild/makefiles.txt
 265
 266 # as-option
 267 # Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
 268
 269 as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
 270              -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
 271              else echo "$(2)"; fi ;)
 272
 273 # cc-option
 274 # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
 275
 276 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 277              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 278
 279 # cc-option-yn
 280 # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
 281 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 282                 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
 283
 284 # cc-option-align
 285 # Prefix align with either -falign or -malign
 286 cc-option-align = $(subst -functions=0,,\
 287         $(call cc-option,-falign-functions=0,-malign-functions=0))
 288
 289 # cc-version
 290 # Usage gcc-ver := $(call cc-version $(CC))
 291 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
 292               $(if $(1), $(1), $(CC)))
 293
 294
 295 # Look for make include files relative to root of kernel src
 296 MAKEFLAGS += --include-dir=$(srctree)
 297
 298 # We need some generic definitions
 299 include  $(srctree)/scripts/Kbuild.include
 300
 301 # For maximum performance (+ possibly random breakage, uncomment
 302 # the following)
 303
 304 #MAKEFLAGS += -rR
 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  = -r
 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                    -include include/linux/autoconf.h
 338
 339 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 340
 341 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 342                    -fno-strict-aliasing -fno-common \
 343                    -ffreestanding
 344 AFLAGS          := -D__ASSEMBLY__
 345
 346 # Read KERNELRELEASE from .kernelrelease (if it exists)
 347 KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
 348 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 349
 350 export  VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
 351         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 352         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 353         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 354
 355 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 356 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 357 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 358
 359 # When compiling out-of-tree modules, put MODVERDIR in the module
 360 # tree rather than in the kernel tree. The kernel tree might
 361 # even be read-only.
 362 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 363
 364 # Files to ignore in find ... statements
 365
 366 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
 367 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 368
 369 # ===========================================================================
 370 # Rules shared between *config targets and build targets
 371
 372 # Basic helpers built in scripts/
 373 .PHONY: scripts_basic
 374 scripts_basic:
 375         $(Q)$(MAKE) $(build)=scripts/basic
 376
 377 # To avoid any implicit rule to kick in, define an empty command.
 378 scripts/basic/%: scripts_basic ;
 379
 380 .PHONY: outputmakefile
 381 # outputmakefile generate a Makefile to be placed in output directory, if
 382 # using a seperate output directory. This allows convinient use
 383 # of make in output directory
 384 outputmakefile:
 385         $(Q)if test ! $(srctree) -ef $(objtree); then \
 386         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 387             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 388             > $(objtree)/Makefile;                                 \
 389             echo '  GEN    $(objtree)/Makefile';                   \
 390         fi
 391
 392 # To make sure we do not include .config for any of the *config targets
 393 # catch them early, and hand them over to scripts/kconfig/Makefile
 394 # It is allowed to specify more targets when calling make, including
 395 # mixing *config targets and build targets.
 396 # For example 'make oldconfig all'.
 397 # Detect when mixed targets is specified, and make a second invocation
 398 # of make so .config is not included in this case either (for *config).
 399
 400 no-dot-config-targets := clean mrproper distclean \
 401                          cscope TAGS tags help %docs check%
 402
 403 config-targets := 0
 404 mixed-targets  := 0
 405 dot-config     := 1
 406
 407 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 408         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 409                 dot-config := 0
 410         endif
 411 endif
 412
 413 ifeq ($(KBUILD_EXTMOD),)
 414         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 415                 config-targets := 1
 416                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 417                         mixed-targets := 1
 418                 endif
 419         endif
 420 endif
 421
 422 ifeq ($(mixed-targets),1)
 423 # ===========================================================================
 424 # We're called with mixed targets (*config and build targets).
 425 # Handle them one by one.
 426
 427 %:: FORCE
 428         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 429
 430 else
 431 ifeq ($(config-targets),1)
 432 # ===========================================================================
 433 # *config targets only - make sure prerequisites are updated, and descend
 434 # in scripts/kconfig to make the *config target
 435
 436 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 437 # KBUILD_DEFCONFIG may point out an alternative default configuration
 438 # used for 'make defconfig'
 439 include $(srctree)/arch/$(ARCH)/Makefile
 440 export KBUILD_DEFCONFIG
 441
 442 config %config: scripts_basic outputmakefile FORCE
 443         $(Q)mkdir -p include/linux
 444         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 445         $(Q)$(MAKE) .kernelrelease
 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 parrallel
 456 .PHONY: scripts
 457 scripts: scripts_basic include/config/MARKER
 458         $(Q)$(MAKE) $(build)=$(@)
 459
 460 scripts_basic: include/linux/autoconf.h
 461
 462 # Objects we will link into vmlinux / subdirs we need to visit
 463 init-y          := init/
 464 drivers-y       := drivers/ sound/
 465 net-y           := net/
 466 libs-y          := lib/
 467 core-y          := usr/
 468 endif # KBUILD_EXTMOD
 469
 470 ifeq ($(dot-config),1)
 471 # In this section, we need .config
 472
 473 # Read in dependencies to all Kconfig* files, make sure to run
 474 # oldconfig if changes are detected.
 475 -include .kconfig.d
 476
 477 include .config
 478
 479 # If .config needs to be updated, it will be done via the dependency
 480 # that autoconf has on .config.
 481 # To avoid any implicit rule to kick in, define an empty command
 482 .config .kconfig.d: ;
 483
 484 # If .config is newer than include/linux/autoconf.h, someone tinkered
 485 # with it and forgot to run make oldconfig.
 486 # If kconfig.d is missing then we are probarly in a cleaned tree so
 487 # we execute the config step to be sure to catch updated Kconfig files
 488 include/linux/autoconf.h: .kconfig.d .config
 489         $(Q)mkdir -p include/linux
 490         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 491 else
 492 # Dummy target needed, because used as prerequisite
 493 include/linux/autoconf.h: ;
 494 endif
 495
 496 # The all: target is the default when no target is given on the
 497 # command line.
 498 # This allow a user to issue only 'make' to build a kernel including modules
 499 # Defaults vmlinux but it is usually overriden in the arch makefile
 500 all: vmlinux
 501
 502 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 503 CFLAGS          += -Os
 504 else
 505 CFLAGS          += -O2
 506 endif
 507
 508 #Add align options if CONFIG_CC_* is not equal to 0
 509 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
 510 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
 511 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
 512 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 513 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 514
 515 ifdef CONFIG_FRAME_POINTER
 516 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 517 else
 518 CFLAGS          += -fomit-frame-pointer
 519 endif
 520
 521 ifdef CONFIG_DEBUG_INFO
 522 CFLAGS          += -g
 523 endif
 524
 525 include $(srctree)/arch/$(ARCH)/Makefile
 526
 527 # arch Makefile may override CC so keep this after arch Makefile is included
 528 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 529 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 530
 531 # warn about C99 declaration after statement
 532 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 533
 534 # disable pointer signedness warnings in gcc 4.0
 535 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 536
 537 # Default kernel image to build when no specific target is given.
 538 # KBUILD_IMAGE may be overruled on the commandline or
 539 # set in the environment
 540 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 541 # this default value
 542 export KBUILD_IMAGE ?= vmlinux
 543
 544 #
 545 # INSTALL_PATH specifies where to place the updated kernel and system map
 546 # images. Default is /boot, but you can set it to other values
 547 export  INSTALL_PATH ?= /boot
 548
 549 #
 550 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 551 # relocations required by build roots.  This is not defined in the
 552 # makefile but the arguement can be passed to make if needed.
 553 #
 554
 555 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 556 export MODLIB
 557
 558
 559 ifeq ($(KBUILD_EXTMOD),)
 560 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 561
 562 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 563                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 564                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 565
 566 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 567                      $(init-n) $(init-) \
 568                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 569                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 570
 571 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 572 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 573 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 574 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 575 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 576 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 577 libs-y          := $(libs-y1) $(libs-y2)
 578
 579 # Build vmlinux
 580 # ---------------------------------------------------------------------------
 581 # vmlinux is build from the objects selected by $(vmlinux-init) and
 582 # $(vmlinux-main). Most are built-in.o files from top-level directories
 583 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 584 # Ordering when linking is important, and $(vmlinux-init) must be first.
 585 #
 586 # vmlinux
 587 #   ^
 588 #   |
 589 #   +-< $(vmlinux-init)
 590 #   |   +--< init/version.o + more
 591 #   |
 592 #   +--< $(vmlinux-main)
 593 #   |    +--< driver/built-in.o mm/built-in.o + more
 594 #   |
 595 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 596 #
 597 # vmlinux version (uname -v) cannot be updated during normal
 598 # descending-into-subdirs phase since we do not yet know if we need to
 599 # update vmlinux.
 600 # Therefore this step is delayed until just before final link of vmlinux -
 601 # except in the kallsyms case where it is done just before adding the
 602 # symbols to the kernel.
 603 #
 604 # System.map is generated to document addresses of all kernel symbols
 605
 606 vmlinux-init := $(head-y) $(init-y)
 607 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 608 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 609 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 610
 611 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 612 # May be overridden by arch/$(ARCH)/Makefile
 613 quiet_cmd_vmlinux__ ?= LD      $@
 614       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 615       -T $(vmlinux-lds) $(vmlinux-init)                          \
 616       --start-group $(vmlinux-main) --end-group                  \
 617       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 618
 619 # Generate new vmlinux version
 620 quiet_cmd_vmlinux_version = GEN     .version
 621       cmd_vmlinux_version = set -e;                     \
 622         if [ ! -r .version ]; then                      \
 623           rm -f .version;                               \
 624           echo 1 >.version;                             \
 625         else                                            \
 626           mv .version .old_version;                     \
 627           expr 0$$(cat .old_version) + 1 >.version;     \
 628         fi;                                             \
 629         $(MAKE) $(build)=init
 630
 631 # Generate System.map
 632 quiet_cmd_sysmap = SYSMAP
 633       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 634
 635 # Link of vmlinux
 636 # If CONFIG_KALLSYMS is set .version is already updated
 637 # Generate System.map and verify that the content is consistent
 638 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 639 # First command is ':' to allow us to use + in front of the rule
 640 define rule_vmlinux__
 641         :
 642         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 643
 644         $(call cmd,vmlinux__)
 645         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 646
 647         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 648           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 649         $(cmd_sysmap) $@ System.map;                    \
 650         if [ $$? -ne 0 ]; then                          \
 651                 rm -f $@;                               \
 652                 /bin/false;                             \
 653         fi;
 654         $(verify_kallsyms)
 655 endef
 656
 657
 658 ifdef CONFIG_KALLSYMS
 659 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 660 # It's a three stage process:
 661 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 662 #   empty
 663 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 664 #   the right size - vmlinux version (uname -v) is updated during this step
 665 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 666 #   but due to the added section, some addresses have shifted.
 667 #   From here, we generate a correct .tmp_kallsyms2.o
 668 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 669 # o Verify that the System.map from vmlinux matches the map from
 670 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 671 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 672 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 673 #   temporary bypass to allow the kernel to be built while the
 674 #   maintainers work out what went wrong with kallsyms.
 675
 676 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 677 last_kallsyms := 3
 678 else
 679 last_kallsyms := 2
 680 endif
 681
 682 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 683
 684 define verify_kallsyms
 685         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 686           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 687           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 688         $(Q)cmp -s System.map .tmp_System.map ||              \
 689                 (echo Inconsistent kallsyms data;             \
 690                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 691                  rm .tmp_kallsyms* ; /bin/false )
 692 endef
 693
 694 # Update vmlinux version before link
 695 # Use + in front of this rule to silent warning about make -j1
 696 # First command is ':' to allow us to use + in front of this rule
 697 cmd_ksym_ld = $(cmd_vmlinux__)
 698 define rule_ksym_ld
 699         :
 700         +$(call cmd,vmlinux_version)
 701         $(call cmd,vmlinux__)
 702         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 703 endef
 704
 705 # Generate .S file with all kernel symbols
 706 quiet_cmd_kallsyms = KSYM    $@
 707       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 708                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 709
 710 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 711         $(call if_changed_dep,as_o_S)
 712
 713 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 714         $(call cmd,kallsyms)
 715
 716 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 717 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 718         $(call if_changed_rule,ksym_ld)
 719
 720 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 721         $(call if_changed,vmlinux__)
 722
 723 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 724         $(call if_changed,vmlinux__)
 725
 726 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 727 $(KALLSYMS): scripts ;
 728
 729 # Generate some data for debugging strange kallsyms problems
 730 debug_kallsyms: .tmp_map$(last_kallsyms)
 731
 732 .tmp_map%: .tmp_vmlinux% FORCE
 733         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 734
 735 .tmp_map3: .tmp_map2
 736
 737 .tmp_map2: .tmp_map1
 738
 739 endif # ifdef CONFIG_KALLSYMS
 740
 741 # vmlinux image - including updated kernel symbols
 742 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 743         $(call if_changed_rule,vmlinux__)
 744         $(Q)rm -f .old_version
 745
 746 # The actual objects are generated when descending,
 747 # make sure no implicit rule kicks in
 748 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 749
 750 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 751 # Preset locale variables to speed up the build process. Limit locale
 752 # tweaks to this spot to avoid wrong language settings when running
 753 # make menuconfig etc.
 754 # Error messages still appears in the original language
 755
 756 .PHONY: $(vmlinux-dirs)
 757 $(vmlinux-dirs): prepare scripts
 758         $(Q)$(MAKE) $(build)=$@
 759
 760 # Build the kernel release string
 761 # The KERNELRELEASE is stored in a file named .kernelrelease
 762 # to be used when executing for example make install or make modules_install
 763 #
 764 # Take the contents of any files called localversion* and the config
 765 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
 766 # LOCALVERSION from the command line override all of this
 767
 768 nullstring :=
 769 space      := $(nullstring) # end of line
 770
 771 ___localver = $(objtree)/localversion* $(srctree)/localversion*
 772 __localver  = $(sort $(wildcard $(___localver)))
 773 # skip backup files (containing '~')
 774 _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
 775
 776 localver = $(subst $(space),, \
 777            $(shell cat /dev/null $(_localver)) \
 778            $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 779
 780 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 781 # and if the SCM is know a tag from the SCM is appended.
 782 # The appended tag is determinded by the SCM used.
 783 #
 784 # Currently, only git is supported.
 785 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 786 # checks as needed.
 787 ifdef CONFIG_LOCALVERSION_AUTO
 788         _localver-auto = $(shell $(CONFIG_SHELL) \
 789                           $(srctree)/scripts/setlocalversion $(srctree))
 790         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 791 endif
 792
 793 localver-full = $(localver)$(localver-auto)
 794
 795 # Store (new) KERNELRELASE string in .kernelrelease
 796 kernelrelease = $(KERNELVERSION)$(localver-full)
 797 .kernelrelease: FORCE
 798         $(Q)rm -f $@
 799         $(Q)echo $(kernelrelease) > $@
 800
 801
 802 # Things we need to do before we recursively start building the kernel
 803 # or the modules are listed in "prepare".
 804 # A multi level approach is used. prepareN is processed before prepareN-1.
 805 # archprepare is used in arch Makefiles and when processed asm symlink,
 806 # version.h and scripts_basic is processed / created.
 807
 808 # Listed in dependency order
 809 .PHONY: prepare archprepare prepare0 prepare1 prepare2 prepare3
 810
 811 # prepare-all is deprecated, use prepare as valid replacement
 812 .PHONY: prepare-all
 813
 814 # prepare3 is used to check if we are building in a separate output directory,
 815 # and if so do:
 816 # 1) Check that make has not been executed in the kernel src $(srctree)
 817 # 2) Create the include2 directory, used for the second asm symlink
 818 prepare3: .kernelrelease
 819 ifneq ($(KBUILD_SRC),)
 820         @echo '  Using $(srctree) as source for kernel'
 821         $(Q)if [ -f $(srctree)/.config ]; then \
 822                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 823                 echo "  in the '$(srctree)' directory.";\
 824                 /bin/false; \
 825         fi;
 826         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 827         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 828 endif
 829
 830 # prepare2 creates a makefile if using a separate output directory
 831 prepare2: prepare3 outputmakefile
 832
 833 prepare1: prepare2 include/linux/version.h include/asm \
 834                    include/config/MARKER
 835 ifneq ($(KBUILD_MODULES),)
 836         $(Q)rm -rf $(MODVERDIR)
 837         $(Q)mkdir -p $(MODVERDIR)
 838 endif
 839
 840 archprepare: prepare1 scripts_basic
 841
 842 prepare0: archprepare FORCE
 843         $(Q)$(MAKE) $(build)=.
 844
 845 # All the preparing..
 846 prepare prepare-all: prepare0
 847
 848 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 849 #       done in arch/$(ARCH)/kernel/Makefile
 850
 851 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 852
 853 # Single targets
 854 # ---------------------------------------------------------------------------
 855
 856 %.s: %.c scripts FORCE
 857         $(Q)$(MAKE) $(build)=$(@D) $@
 858 %.i: %.c scripts FORCE
 859         $(Q)$(MAKE) $(build)=$(@D) $@
 860 %.o: %.c scripts FORCE
 861         $(Q)$(MAKE) $(build)=$(@D) $@
 862 %.ko: scripts FORCE
 863         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
 864         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 865 %/:      scripts prepare FORCE
 866         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 867 %.lst: %.c scripts FORCE
 868         $(Q)$(MAKE) $(build)=$(@D) $@
 869 %.s: %.S scripts FORCE
 870         $(Q)$(MAKE) $(build)=$(@D) $@
 871 %.o: %.S scripts FORCE
 872         $(Q)$(MAKE) $(build)=$(@D) $@
 873
 874 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 875 #       hard to detect, but I suppose "make mrproper" is a good idea
 876 #       before switching between archs anyway.
 877
 878 include/asm:
 879         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 880         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 881         @ln -fsn asm-$(ARCH) $@
 882
 883 #       Split autoconf.h into include/linux/config/*
 884
 885 include/config/MARKER: scripts/basic/split-include include/linux/autoconf.h
 886         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 887         @scripts/basic/split-include include/linux/autoconf.h include/config
 888         @touch $@
 889
 890 # Generate some files
 891 # ---------------------------------------------------------------------------
 892
 893 # KERNELRELEASE can change from a few different places, meaning version.h
 894 # needs to be updated, so this check is forced on all builds
 895
 896 uts_len := 64
 897
 898 define filechk_version.h
 899         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 900           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 901           exit 1; \
 902         fi; \
 903         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 904           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 905          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 906         )
 907 endef
 908
 909 include/linux/version.h: $(srctree)/Makefile .config FORCE
 910         $(call filechk,version.h)
 911
 912 # ---------------------------------------------------------------------------
 913
 914 .PHONY: depend dep
 915 depend dep:
 916         @echo '*** Warning: make $@ is unnecessary now.'
 917
 918 # ---------------------------------------------------------------------------
 919 # Modules
 920
 921 ifdef CONFIG_MODULES
 922
 923 #       By default, build modules as well
 924
 925 all: modules
 926
 927 #       Build modules
 928
 929 .PHONY: modules
 930 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 931         @echo '  Building modules, stage 2.';
 932         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 933
 934
 935 # Target to prepare building external modules
 936 .PHONY: modules_prepare
 937 modules_prepare: prepare scripts
 938
 939 # Target to install modules
 940 .PHONY: modules_install
 941 modules_install: _modinst_ _modinst_post
 942
 943 .PHONY: _modinst_
 944 _modinst_:
 945         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 946                 echo "Warning: you may need to install module-init-tools"; \
 947                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 948                 sleep 1; \
 949         fi
 950         @rm -rf $(MODLIB)/kernel
 951         @rm -f $(MODLIB)/source
 952         @mkdir -p $(MODLIB)/kernel
 953         @ln -s $(srctree) $(MODLIB)/source
 954         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 955                 rm -f $(MODLIB)/build ; \
 956                 ln -s $(objtree) $(MODLIB)/build ; \
 957         fi
 958         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 959
 960 # If System.map exists, run depmod.  This deliberately does not have a
 961 # dependency on System.map since that would run the dependency tree on
 962 # vmlinux.  This depmod is only for convenience to give the initial
 963 # boot a modules.dep even before / is mounted read-write.  However the
 964 # boot script depmod is the master version.
 965 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 966 depmod_opts     :=
 967 else
 968 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 969 endif
 970 .PHONY: _modinst_post
 971 _modinst_post: _modinst_
 972         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 973
 974 else # CONFIG_MODULES
 975
 976 # Modules not configured
 977 # ---------------------------------------------------------------------------
 978
 979 modules modules_install: FORCE
 980         @echo
 981         @echo "The present kernel configuration has modules disabled."
 982         @echo "Type 'make config' and enable loadable module support."
 983         @echo "Then build a kernel with module support enabled."
 984         @echo
 985         @exit 1
 986
 987 endif # CONFIG_MODULES
 988
 989 ###
 990 # Cleaning is done on three levels.
 991 # make clean     Delete most generated files
 992 #                Leave enough to build external modules
 993 # make mrproper  Delete the current configuration, and all generated files
 994 # make distclean Remove editor backup files, patch leftover files and the like
 995
 996 # Directories & files removed with 'make clean'
 997 CLEAN_DIRS  += $(MODVERDIR)
 998 CLEAN_FILES +=  vmlinux System.map \
 999                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1000
1001 # Directories & files removed with 'make mrproper'
1002 MRPROPER_DIRS  += include/config include2
1003 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1004                   include/linux/autoconf.h include/linux/version.h \
1005                   .kernelrelease Module.symvers tags TAGS cscope*
1006
1007 # clean - Delete most, but leave enough to build external modules
1008 #
1009 clean: rm-dirs  := $(CLEAN_DIRS)
1010 clean: rm-files := $(CLEAN_FILES)
1011 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1012
1013 .PHONY: $(clean-dirs) clean archclean
1014 $(clean-dirs):
1015         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1016
1017 clean: archclean $(clean-dirs)
1018         $(call cmd,rmdirs)
1019         $(call cmd,rmfiles)
1020         @find . $(RCS_FIND_IGNORE) \
1021                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1022                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1023                 -type f -print | xargs rm -f
1024
1025 # mrproper - Delete all generated files, including .config
1026 #
1027 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1028 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1029 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1030
1031 .PHONY: $(mrproper-dirs) mrproper archmrproper
1032 $(mrproper-dirs):
1033         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1034
1035 mrproper: clean archmrproper $(mrproper-dirs)
1036         $(call cmd,rmdirs)
1037         $(call cmd,rmfiles)
1038
1039 # distclean
1040 #
1041 .PHONY: distclean
1042
1043 distclean: mrproper
1044         @find $(srctree) $(RCS_FIND_IGNORE) \
1045                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1046                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1047                 -o -name '.*.rej' -o -size 0 \
1048                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1049                 -type f -print | xargs rm -f
1050
1051
1052 # Packaging of the kernel to various formats
1053 # ---------------------------------------------------------------------------
1054 # rpm target kept for backward compatibility
1055 package-dir     := $(srctree)/scripts/package
1056
1057 .PHONY: %-pkg rpm
1058
1059 %pkg: FORCE
1060         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1061 rpm: FORCE
1062         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1063
1064
1065 # Brief documentation of the typical targets used
1066 # ---------------------------------------------------------------------------
1067
1068 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1069 boards := $(notdir $(boards))
1070
1071 help:
1072         @echo  'Cleaning targets:'
1073         @echo  '  clean           - remove most generated files but keep the config'
1074         @echo  '  mrproper        - remove all generated files + config + various backup files'
1075         @echo  ''
1076         @echo  'Configuration targets:'
1077         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1078         @echo  ''
1079         @echo  'Other generic targets:'
1080         @echo  '  all             - Build all targets marked with [*]'
1081         @echo  '* vmlinux         - Build the bare kernel'
1082         @echo  '* modules         - Build all modules'
1083         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1084         @echo  '  dir/            - Build all files in dir and below'
1085         @echo  '  dir/file.[ois]  - Build specified target only'
1086         @echo  '  dir/file.ko     - Build module including final link'
1087         @echo  '  rpm             - Build a kernel as an RPM package'
1088         @echo  '  tags/TAGS       - Generate tags file for editors'
1089         @echo  '  cscope          - Generate cscope index'
1090         @echo  '  kernelrelease   - Output the release version string'
1091         @echo  '  kernelversion   - Output the version stored in Makefile'
1092         @echo  ''
1093         @echo  'Static analysers'
1094         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1095         @echo  '                    and init sections from non-init sections'
1096         @echo  '  checkstack      - Generate a list of stack hogs'
1097         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1098         @echo  ''
1099         @echo  'Kernel packaging:'
1100         @$(MAKE) -f $(package-dir)/Makefile help
1101         @echo  ''
1102         @echo  'Documentation targets:'
1103         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1104         @echo  ''
1105         @echo  'Architecture specific targets ($(ARCH)):'
1106         @$(if $(archhelp),$(archhelp),\
1107                 echo '  No architecture specific help defined for $(ARCH)')
1108         @echo  ''
1109         @$(if $(boards), \
1110                 $(foreach b, $(boards), \
1111                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1112                 echo '')
1113
1114         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1115         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1116         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1117         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1118         @echo  ''
1119         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1120         @echo  'For further info see the ./README file'
1121
1122
1123 # Documentation targets
1124 # ---------------------------------------------------------------------------
1125 %docs: scripts_basic FORCE
1126         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1127
1128 else # KBUILD_EXTMOD
1129
1130 ###
1131 # External module support.
1132 # When building external modules the kernel used as basis is considered
1133 # read-only, and no consistency checks are made and the make
1134 # system is not used on the basis kernel. If updates are required
1135 # in the basis kernel ordinary make commands (without M=...) must
1136 # be used.
1137 #
1138 # The following are the only valid targets when building external
1139 # modules.
1140 # make M=dir clean     Delete all automatically generated files
1141 # make M=dir modules   Make all modules in specified dir
1142 # make M=dir           Same as 'make M=dir modules'
1143 # make M=dir modules_install
1144 #                      Install the modules build in the module directory
1145 #                      Assumes install directory is already created
1146
1147 # We are always building modules
1148 KBUILD_MODULES := 1
1149 .PHONY: crmodverdir
1150 crmodverdir:
1151         $(Q)mkdir -p $(MODVERDIR)
1152
1153 .PHONY: $(objtree)/Module.symvers
1154 $(objtree)/Module.symvers:
1155         @test -e $(objtree)/Module.symvers || ( \
1156         echo; \
1157         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1158         echo "           is missing; modules will have no dependencies and modversions."; \
1159         echo )
1160
1161 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1162 .PHONY: $(module-dirs) modules
1163 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1164         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1165
1166 modules: $(module-dirs)
1167         @echo '  Building modules, stage 2.';
1168         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1169
1170 .PHONY: modules_install
1171 modules_install:
1172         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1173
1174 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1175
1176 .PHONY: $(clean-dirs) clean
1177 $(clean-dirs):
1178         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1179
1180 clean:  rm-dirs := $(MODVERDIR)
1181 clean: $(clean-dirs)
1182         $(call cmd,rmdirs)
1183         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1184                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1185                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1186                 -type f -print | xargs rm -f
1187
1188 help:
1189         @echo  '  Building external modules.'
1190         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1191         @echo  ''
1192         @echo  '  modules         - default target, build the module(s)'
1193         @echo  '  modules_install - install the module'
1194         @echo  '  clean           - remove generated files in module directory only'
1195         @echo  ''
1196 endif # KBUILD_EXTMOD
1197
1198 # Generate tags for editors
1199 # ---------------------------------------------------------------------------
1200
1201 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1202 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1203 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1204
1205 ifeq ($(src),$(obj))
1206 __srctree =
1207 else
1208 __srctree = $(srctree)/
1209 endif
1210
1211 ifeq ($(ALLSOURCE_ARCHS),)
1212 ifeq ($(ARCH),um)
1213 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1214 else
1215 ALLINCLUDE_ARCHS := $(ARCH)
1216 endif
1217 else
1218 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1219 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1220 endif
1221
1222 ALLSOURCE_ARCHS := $(ARCH)
1223
1224 define all-sources
1225         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1226                \( -name include -o -name arch \) -prune -o \
1227                -name '*.[chS]' -print; \
1228           for ARCH in $(ALLSOURCE_ARCHS) ; do \
1229                find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1230                     -name '*.[chS]' -print; \
1231           done ; \
1232           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1233                -name '*.[chS]' -print; \
1234           find $(__srctree)include $(RCS_FIND_IGNORE) \
1235                \( -name config -o -name 'asm-*' \) -prune \
1236                -o -name '*.[chS]' -print; \
1237           for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1238                find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1239                     -name '*.[chS]' -print; \
1240           done ; \
1241           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1242                -name '*.[chS]' -print )
1243 endef
1244
1245 quiet_cmd_cscope-file = FILELST cscope.files
1246       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1247
1248 quiet_cmd_cscope = MAKE    cscope.out
1249       cmd_cscope = cscope -b
1250
1251 cscope: FORCE
1252         $(call cmd,cscope-file)
1253         $(call cmd,cscope)
1254
1255 quiet_cmd_TAGS = MAKE   $@
1256 define cmd_TAGS
1257         rm -f $@; \
1258         ETAGSF=`etags --version | grep -i exuberant >/dev/null &&     \
1259                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1260                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1261                       --extra=+f --c-kinds=+px"`;                     \
1262                 $(all-sources) | xargs etags $$ETAGSF -a
1263 endef
1264
1265 TAGS: FORCE
1266         $(call cmd,TAGS)
1267
1268
1269 quiet_cmd_tags = MAKE   $@
1270 define cmd_tags
1271         rm -f $@; \
1272         CTAGSF=`ctags --version | grep -i exuberant >/dev/null &&     \
1273                 echo "-I __initdata,__exitdata,__acquires,__releases  \
1274                       -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL              \
1275                       --extra=+f --c-kinds=+px"`;                     \
1276                 $(all-sources) | xargs ctags $$CTAGSF -a
1277 endef
1278
1279 tags: FORCE
1280         $(call cmd,tags)
1281
1282
1283 # Scripts to check various things for consistency
1284 # ---------------------------------------------------------------------------
1285
1286 includecheck:
1287         find * $(RCS_FIND_IGNORE) \
1288                 -name '*.[hcS]' -type f -print | sort \
1289                 | xargs $(PERL) -w scripts/checkincludes.pl
1290
1291 versioncheck:
1292         find * $(RCS_FIND_IGNORE) \
1293                 -name '*.[hcS]' -type f -print | sort \
1294                 | xargs $(PERL) -w scripts/checkversion.pl
1295
1296 buildcheck:
1297         $(PERL) $(srctree)/scripts/reference_discarded.pl
1298         $(PERL) $(srctree)/scripts/reference_init.pl
1299
1300 namespacecheck:
1301         $(PERL) $(srctree)/scripts/namespace.pl
1302
1303 endif #ifeq ($(config-targets),1)
1304 endif #ifeq ($(mixed-targets),1)
1305
1306 .PHONY: checkstack
1307 checkstack:
1308         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1309         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1310
1311 kernelrelease:
1312         $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1313         $(error kernelrelease not valid - run 'make *config' to update it))
1314 kernelversion:
1315         @echo $(KERNELVERSION)
1316
1317 # FIXME Should go into a make.lib or something
1318 # ===========================================================================
1319
1320 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1321       cmd_rmdirs = rm -rf $(rm-dirs)
1322
1323 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1324       cmd_rmfiles = rm -f $(rm-files)
1325
1326
1327 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1328           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1329           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1330
1331 quiet_cmd_as_o_S = AS      $@
1332 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1333
1334 # read all saved command lines
1335
1336 targets := $(wildcard $(sort $(targets)))
1337 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1338
1339 ifneq ($(cmd_files),)
1340   $(cmd_files): ;       # Do not try to update included dependency files
1341   include $(cmd_files)
1342 endif
1343
1344 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1345 # Usage:
1346 # $(Q)$(MAKE) $(clean)=dir
1347 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1348
1349 endif   # skip-makefile
1350
1351 FORCE: