Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 13
   4 EXTRAVERSION = .5
   5 NAME=Woozy Numbat
   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)
 110
 111 $(filter-out _all,$(MAKECMDGOALS)) _all:
 112         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT)         \
 113         KBUILD_SRC=$(CURDIR)         KBUILD_VERBOSE=$(KBUILD_VERBOSE)   \
 114         KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)"   \
 115         -f $(CURDIR)/Makefile $@
 116
 117 # Leave processing to above invocation of make
 118 skip-makefile := 1
 119 endif # ifneq ($(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 nullstring :=
 146 space      := $(nullstring) # end of line
 147
 148 # Take the contents of any files called localversion* and the config
 149 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
 150 # careful not to include files twice if building in the source
 151 # directory. LOCALVERSION from the command line override all of this
 152
 153 localver := $(objtree)/localversion* $(srctree)/localversion*
 154 localver := $(sort $(wildcard $(localver)))
 155 # skip backup files (containing '~')
 156 localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
 157
 158 LOCALVERSION = $(subst $(space),, \
 159                $(shell cat /dev/null $(localver)) \
 160                $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 161
 162 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
 163
 164 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 165 # first, and if a usermode build is happening, the "ARCH=um" on the command
 166 # line overrides the setting of ARCH below.  If a native build is happening,
 167 # then ARCH is assigned, getting whatever value it gets normally, and
 168 # SUBARCH is subsequently ignored.
 169
 170 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 171                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 172                                   -e s/s390x/s390/ -e s/parisc64/parisc/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192
 193 ARCH            ?= $(SUBARCH)
 194 CROSS_COMPILE   ?=
 195
 196 # Architecture as present in compile.h
 197 UTS_MACHINE := $(ARCH)
 198
 199 # SHELL used by kbuild
 200 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 201           else if [ -x /bin/bash ]; then echo /bin/bash; \
 202           else echo sh; fi ; fi)
 203
 204 HOSTCC          = gcc
 205 HOSTCXX         = g++
 206 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 207 HOSTCXXFLAGS    = -O2
 208
 209 #       Decide whether to build built-in, modular, or both.
 210 #       Normally, just do built-in.
 211
 212 KBUILD_MODULES :=
 213 KBUILD_BUILTIN := 1
 214
 215 #       If we have only "make modules", don't compile built-in objects.
 216 #       When we're building modules with modversions, we need to consider
 217 #       the built-in objects during the descend as well, in order to
 218 #       make sure the checksums are uptodate before we record them.
 219
 220 ifeq ($(MAKECMDGOALS),modules)
 221   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 222 endif
 223
 224 #       If we have "make <whatever> modules", compile modules
 225 #       in addition to whatever we do anyway.
 226 #       Just "make" or "make all" shall build modules as well
 227
 228 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 229   KBUILD_MODULES := 1
 230 endif
 231
 232 ifeq ($(MAKECMDGOALS),)
 233   KBUILD_MODULES := 1
 234 endif
 235
 236 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
 237 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 238
 239 # Beautify output
 240 # ---------------------------------------------------------------------------
 241 #
 242 # Normally, we echo the whole command before executing it. By making
 243 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 244 # $(quiet) to choose other forms of output instead, e.g.
 245 #
 246 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 247 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 248 #
 249 # If $(quiet) is empty, the whole command will be printed.
 250 # If it is set to "quiet_", only the short version will be printed.
 251 # If it is set to "silent_", nothing wil be printed at all, since
 252 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 253 #
 254 # A simple variant is to prefix commands with $(Q) - that's usefull
 255 # for commands that shall be hidden in non-verbose mode.
 256 #
 257 #       $(Q)ln $@ :<
 258 #
 259 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 260 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 261
 262 ifeq ($(KBUILD_VERBOSE),1)
 263   quiet =
 264   Q =
 265 else
 266   quiet=quiet_
 267   Q = @
 268 endif
 269
 270 # If the user is running make -s (silent mode), suppress echoing of
 271 # commands
 272
 273 ifneq ($(findstring s,$(MAKEFLAGS)),)
 274   quiet=silent_
 275 endif
 276
 277 export quiet Q KBUILD_VERBOSE
 278
 279 ######
 280 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
 281 # See documentation in Documentation/kbuild/makefiles.txt
 282
 283 # cc-option
 284 # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
 285
 286 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 287              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 288
 289 # For backward compatibility
 290 check_gcc = $(warning check_gcc is deprecated - use cc-option) \
 291             $(call cc-option, $(1),$(2))
 292
 293 # cc-option-yn
 294 # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
 295 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 296                 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
 297
 298 # cc-option-align
 299 # Prefix align with either -falign or -malign
 300 cc-option-align = $(subst -functions=0,,\
 301         $(call cc-option,-falign-functions=0,-malign-functions=0))
 302
 303 # cc-version
 304 # Usage gcc-ver := $(call cc-version $(CC))
 305 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
 306               $(if $(1), $(1), $(CC)))
 307
 308
 309 # Look for make include files relative to root of kernel src
 310 MAKEFLAGS += --include-dir=$(srctree)
 311
 312 # For maximum performance (+ possibly random breakage, uncomment
 313 # the following)
 314
 315 #MAKEFLAGS += -rR
 316
 317 # Make variables (CC, etc...)
 318
 319 AS              = $(CROSS_COMPILE)as
 320 LD              = $(CROSS_COMPILE)ld
 321 CC              = $(CROSS_COMPILE)gcc
 322 CPP             = $(CC) -E
 323 AR              = $(CROSS_COMPILE)ar
 324 NM              = $(CROSS_COMPILE)nm
 325 STRIP           = $(CROSS_COMPILE)strip
 326 OBJCOPY         = $(CROSS_COMPILE)objcopy
 327 OBJDUMP         = $(CROSS_COMPILE)objdump
 328 AWK             = awk
 329 GENKSYMS        = scripts/genksyms/genksyms
 330 DEPMOD          = /sbin/depmod
 331 KALLSYMS        = scripts/kallsyms
 332 PERL            = perl
 333 CHECK           = sparse
 334
 335 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
 336 MODFLAGS        = -DMODULE
 337 CFLAGS_MODULE   = $(MODFLAGS)
 338 AFLAGS_MODULE   = $(MODFLAGS)
 339 LDFLAGS_MODULE  = -r
 340 CFLAGS_KERNEL   =
 341 AFLAGS_KERNEL   =
 342
 343
 344 # Use LINUXINCLUDE when you must reference the include/ directory.
 345 # Needed to be compatible with the O= option
 346 LINUXINCLUDE    := -Iinclude \
 347                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
 348
 349 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 350
 351 CFLAGS          := -Wall -Wstrict-prototypes -Wno-trigraphs \
 352                    -fno-strict-aliasing -fno-common \
 353                    -ffreestanding
 354 AFLAGS          := -D__ASSEMBLY__
 355
 356 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
 357         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 358         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 359         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 360
 361 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 362 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 363 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 364
 365 # When compiling out-of-tree modules, put MODVERDIR in the module
 366 # tree rather than in the kernel tree. The kernel tree might
 367 # even be read-only.
 368 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 369
 370 # The temporary file to save gcc -MD generated dependencies must not
 371 # contain a comma
 372 comma := ,
 373 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 374
 375 # Files to ignore in find ... statements
 376
 377 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc \) -prune -o
 378 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc
 379
 380 # ===========================================================================
 381 # Rules shared between *config targets and build targets
 382
 383 # Basic helpers built in scripts/
 384 .PHONY: scripts_basic
 385 scripts_basic:
 386         $(Q)$(MAKE) $(build)=scripts/basic
 387
 388 .PHONY: outputmakefile
 389 # outputmakefile generate a Makefile to be placed in output directory, if
 390 # using a seperate output directory. This allows convinient use
 391 # of make in output directory
 392 outputmakefile:
 393         $(Q)if test ! $(srctree) -ef $(objtree); then \
 394         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 395             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 396             > $(objtree)/Makefile;                                 \
 397             echo '  GEN    $(objtree)/Makefile';                   \
 398         fi
 399
 400 # To make sure we do not include .config for any of the *config targets
 401 # catch them early, and hand them over to scripts/kconfig/Makefile
 402 # It is allowed to specify more targets when calling make, including
 403 # mixing *config targets and build targets.
 404 # For example 'make oldconfig all'.
 405 # Detect when mixed targets is specified, and make a second invocation
 406 # of make so .config is not included in this case either (for *config).
 407
 408 no-dot-config-targets := clean mrproper distclean \
 409                          cscope TAGS tags help %docs check%
 410
 411 config-targets := 0
 412 mixed-targets  := 0
 413 dot-config     := 1
 414
 415 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 416         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 417                 dot-config := 0
 418         endif
 419 endif
 420
 421 ifeq ($(KBUILD_EXTMOD),)
 422         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 423                 config-targets := 1
 424                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 425                         mixed-targets := 1
 426                 endif
 427         endif
 428 endif
 429
 430 ifeq ($(mixed-targets),1)
 431 # ===========================================================================
 432 # We're called with mixed targets (*config and build targets).
 433 # Handle them one by one.
 434
 435 %:: FORCE
 436         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 437
 438 else
 439 ifeq ($(config-targets),1)
 440 # ===========================================================================
 441 # *config targets only - make sure prerequisites are updated, and descend
 442 # in scripts/kconfig to make the *config target
 443
 444 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 445 # KBUILD_DEFCONFIG may point out an alternative default configuration
 446 # used for 'make defconfig'
 447 include $(srctree)/arch/$(ARCH)/Makefile
 448 export KBUILD_DEFCONFIG
 449
 450 config: scripts_basic outputmakefile FORCE
 451         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 452 %config: scripts_basic outputmakefile FORCE
 453         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 454
 455 else
 456 # ===========================================================================
 457 # Build targets only - this includes vmlinux, arch specific targets, clean
 458 # targets and others. In general all targets except *config targets.
 459
 460 ifeq ($(KBUILD_EXTMOD),)
 461 # Additional helpers built in scripts/
 462 # Carefully list dependencies so we do not try to build scripts twice
 463 # in parrallel
 464 .PHONY: scripts
 465 scripts: scripts_basic include/config/MARKER
 466         $(Q)$(MAKE) $(build)=$(@)
 467
 468 scripts_basic: include/linux/autoconf.h
 469
 470 # Objects we will link into vmlinux / subdirs we need to visit
 471 init-y          := init/
 472 drivers-y       := drivers/ sound/
 473 net-y           := net/
 474 libs-y          := lib/
 475 core-y          := usr/
 476 endif # KBUILD_EXTMOD
 477
 478 ifeq ($(dot-config),1)
 479 # In this section, we need .config
 480
 481 # Read in dependencies to all Kconfig* files, make sure to run
 482 # oldconfig if changes are detected.
 483 -include .config.cmd
 484
 485 include .config
 486
 487 # If .config needs to be updated, it will be done via the dependency
 488 # that autoconf has on .config.
 489 # To avoid any implicit rule to kick in, define an empty command
 490 .config: ;
 491
 492 # If .config is newer than include/linux/autoconf.h, someone tinkered
 493 # with it and forgot to run make oldconfig
 494 include/linux/autoconf.h: .config
 495         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 496 else
 497 # Dummy target needed, because used as prerequisite
 498 include/linux/autoconf.h: ;
 499 endif
 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 overriden in the arch makefile
 505 all: vmlinux
 506
 507 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 508 CFLAGS          += -Os
 509 else
 510 CFLAGS          += -O2
 511 endif
 512
 513 #Add align options if CONFIG_CC_* is not equal to 0
 514 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
 515 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
 516 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
 517 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 518 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 519
 520 ifdef CONFIG_FRAME_POINTER
 521 CFLAGS          += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 522 else
 523 CFLAGS          += -fomit-frame-pointer
 524 endif
 525
 526 ifdef CONFIG_DEBUG_INFO
 527 CFLAGS          += -g
 528 endif
 529
 530 include $(srctree)/arch/$(ARCH)/Makefile
 531
 532 # arch Makefile may override CC so keep this after arch Makefile is included
 533 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 534 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 535
 536 # warn about C99 declaration after statement
 537 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 538
 539 # disable pointer signedness warnings in gcc 4.0
 540 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 541
 542 # Default kernel image to build when no specific target is given.
 543 # KBUILD_IMAGE may be overruled on the commandline or
 544 # set in the environment
 545 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 546 # this default value
 547 export KBUILD_IMAGE ?= vmlinux
 548
 549 #
 550 # INSTALL_PATH specifies where to place the updated kernel and system map
 551 # images. Default is /boot, but you can set it to other values
 552 export  INSTALL_PATH ?= /boot
 553
 554 #
 555 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 556 # relocations required by build roots.  This is not defined in the
 557 # makefile but the arguement can be passed to make if needed.
 558 #
 559
 560 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 561 export MODLIB
 562
 563
 564 ifeq ($(KBUILD_EXTMOD),)
 565 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 566
 567 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 568                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 569                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 570
 571 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 572                      $(init-n) $(init-) \
 573                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 574                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 575
 576 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 577 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 578 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 579 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 580 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 581 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 582 libs-y          := $(libs-y1) $(libs-y2)
 583
 584 # Build vmlinux
 585 # ---------------------------------------------------------------------------
 586 # vmlinux is build from the objects selected by $(vmlinux-init) and
 587 # $(vmlinux-main). Most are built-in.o files from top-level directories
 588 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 589 # Ordering when linking is important, and $(vmlinux-init) must be first.
 590 #
 591 # vmlinux
 592 #   ^
 593 #   |
 594 #   +-< $(vmlinux-init)
 595 #   |   +--< init/version.o + more
 596 #   |
 597 #   +--< $(vmlinux-main)
 598 #   |    +--< driver/built-in.o mm/built-in.o + more
 599 #   |
 600 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 601 #
 602 # vmlinux version (uname -v) cannot be updated during normal
 603 # descending-into-subdirs phase since we do not yet know if we need to
 604 # update vmlinux.
 605 # Therefore this step is delayed until just before final link of vmlinux -
 606 # except in the kallsyms case where it is done just before adding the
 607 # symbols to the kernel.
 608 #
 609 # System.map is generated to document addresses of all kernel symbols
 610
 611 vmlinux-init := $(head-y) $(init-y)
 612 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 613 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 614 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 615
 616 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 617 # May be overridden by arch/$(ARCH)/Makefile
 618 quiet_cmd_vmlinux__ ?= LD      $@
 619       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 620       -T $(vmlinux-lds) $(vmlinux-init)                          \
 621       --start-group $(vmlinux-main) --end-group                  \
 622       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 623
 624 # Generate new vmlinux version
 625 quiet_cmd_vmlinux_version = GEN     .version
 626       cmd_vmlinux_version = set -e;                     \
 627         . $(srctree)/scripts/mkversion > .tmp_version;  \
 628         mv -f .tmp_version .version;                    \
 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
 639 define rule_vmlinux__
 640         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 641
 642         $(call cmd,vmlinux__)
 643         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 644
 645         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 646           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 647         $(cmd_sysmap) $@ System.map;                    \
 648         if [ $$? -ne 0 ]; then                          \
 649                 rm -f $@;                               \
 650                 /bin/false;                             \
 651         fi;
 652         $(verify_kallsyms)
 653 endef
 654
 655
 656 ifdef CONFIG_KALLSYMS
 657 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 658 # It's a three stage process:
 659 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 660 #   empty
 661 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 662 #   the right size - vmlinux version (uname -v) is updated during this step
 663 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 664 #   but due to the added section, some addresses have shifted.
 665 #   From here, we generate a correct .tmp_kallsyms2.o
 666 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 667 # o Verify that the System.map from vmlinux matches the map from
 668 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 669 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 670 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 671 #   temporary bypass to allow the kernel to be built while the
 672 #   maintainers work out what went wrong with kallsyms.
 673
 674 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 675 last_kallsyms := 3
 676 else
 677 last_kallsyms := 2
 678 endif
 679
 680 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 681
 682 define verify_kallsyms
 683         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 684           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 685           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 686         $(Q)cmp -s System.map .tmp_System.map ||              \
 687                 (echo Inconsistent kallsyms data;             \
 688                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 689                  rm .tmp_kallsyms* ; /bin/false )
 690 endef
 691
 692 # Update vmlinux version before link
 693 # Use + in front of this rule to silent warning about make -j1
 694 cmd_ksym_ld = $(cmd_vmlinux__)
 695 define rule_ksym_ld
 696         +$(call cmd,vmlinux_version)
 697         $(call cmd,vmlinux__)
 698         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 699 endef
 700
 701 # Generate .S file with all kernel symbols
 702 quiet_cmd_kallsyms = KSYM    $@
 703       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 704                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 705
 706 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 707         $(call if_changed_dep,as_o_S)
 708
 709 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 710         $(call cmd,kallsyms)
 711
 712 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 713 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 714         $(call if_changed_rule,ksym_ld)
 715
 716 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 717         $(call if_changed,vmlinux__)
 718
 719 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 720         $(call if_changed,vmlinux__)
 721
 722 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 723 $(KALLSYMS): scripts ;
 724
 725 endif # ifdef CONFIG_KALLSYMS
 726
 727 # vmlinux image - including updated kernel symbols
 728 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 729         $(call if_changed_rule,vmlinux__)
 730
 731 # The actual objects are generated when descending,
 732 # make sure no implicit rule kicks in
 733 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 734
 735 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 736 # Preset locale variables to speed up the build process. Limit locale
 737 # tweaks to this spot to avoid wrong language settings when running
 738 # make menuconfig etc.
 739 # Error messages still appears in the original language
 740
 741 .PHONY: $(vmlinux-dirs)
 742 $(vmlinux-dirs): prepare-all scripts
 743         $(Q)$(MAKE) $(build)=$@
 744
 745 # Things we need to do before we recursively start building the kernel
 746 # or the modules are listed in "prepare-all".
 747 # A multi level approach is used. prepare1 is updated first, then prepare0.
 748 # prepare-all is the collection point for the prepare targets.
 749
 750 .PHONY: prepare-all prepare prepare0 prepare1 prepare2
 751
 752 # prepare2 is used to check if we are building in a separate output directory,
 753 # and if so do:
 754 # 1) Check that make has not been executed in the kernel src $(srctree)
 755 # 2) Create the include2 directory, used for the second asm symlink
 756
 757 prepare2:
 758 ifneq ($(KBUILD_SRC),)
 759         @echo '  Using $(srctree) as source for kernel'
 760         $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
 761                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 762                 echo "  in the '$(srctree)' directory.";\
 763                 /bin/false; \
 764         fi;
 765         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 766         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 767 endif
 768
 769 # prepare1 creates a makefile if using a separate output directory
 770 prepare1: prepare2 outputmakefile
 771
 772 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
 773 ifneq ($(KBUILD_MODULES),)
 774         $(Q)rm -rf $(MODVERDIR)
 775         $(Q)mkdir -p $(MODVERDIR)
 776 endif
 777
 778 # All the preparing..
 779 prepare-all: prepare0 prepare
 780
 781 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 782 #       done in arch/$(ARCH)/kernel/Makefile
 783
 784 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 785
 786 # Single targets
 787 # ---------------------------------------------------------------------------
 788
 789 %.s: %.c scripts FORCE
 790         $(Q)$(MAKE) $(build)=$(@D) $@
 791 %.i: %.c scripts FORCE
 792         $(Q)$(MAKE) $(build)=$(@D) $@
 793 %.o: %.c scripts FORCE
 794         $(Q)$(MAKE) $(build)=$(@D) $@
 795 %.ko: scripts FORCE
 796         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
 797         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 798 %/:      scripts prepare FORCE
 799         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 800 %.lst: %.c scripts FORCE
 801         $(Q)$(MAKE) $(build)=$(@D) $@
 802 %.s: %.S scripts FORCE
 803         $(Q)$(MAKE) $(build)=$(@D) $@
 804 %.o: %.S scripts FORCE
 805         $(Q)$(MAKE) $(build)=$(@D) $@
 806
 807 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 808 #       hard to detect, but I suppose "make mrproper" is a good idea
 809 #       before switching between archs anyway.
 810
 811 include/asm:
 812         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 813         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 814         @ln -fsn asm-$(ARCH) $@
 815
 816 #       Split autoconf.h into include/linux/config/*
 817
 818 include/config/MARKER: include/linux/autoconf.h
 819         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 820         @scripts/basic/split-include include/linux/autoconf.h include/config
 821         @touch $@
 822
 823 # Generate some files
 824 # ---------------------------------------------------------------------------
 825
 826 # KERNELRELEASE can change from a few different places, meaning version.h
 827 # needs to be updated, so this check is forced on all builds
 828
 829 uts_len := 64
 830
 831 define filechk_version.h
 832         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 833           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 834           exit 1; \
 835         fi; \
 836         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 837           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 838          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 839         )
 840 endef
 841
 842 include/linux/version.h: $(srctree)/Makefile FORCE
 843         $(call filechk,version.h)
 844
 845 # ---------------------------------------------------------------------------
 846
 847 .PHONY: depend dep
 848 depend dep:
 849         @echo '*** Warning: make $@ is unnecessary now.'
 850
 851 # ---------------------------------------------------------------------------
 852 # Modules
 853
 854 ifdef CONFIG_MODULES
 855
 856 #       By default, build modules as well
 857
 858 all: modules
 859
 860 #       Build modules
 861
 862 .PHONY: modules
 863 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 864         @echo '  Building modules, stage 2.';
 865         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 866
 867
 868 # Target to prepare building external modules
 869 .PHONY: modules_prepare
 870 modules_prepare: prepare-all scripts
 871
 872 # Target to install modules
 873 .PHONY: modules_install
 874 modules_install: _modinst_ _modinst_post
 875
 876 .PHONY: _modinst_
 877 _modinst_:
 878         @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
 879                 echo "Warning: you may need to install module-init-tools"; \
 880                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 881                 sleep 1; \
 882         fi
 883         @rm -rf $(MODLIB)/kernel
 884         @rm -f $(MODLIB)/source
 885         @mkdir -p $(MODLIB)/kernel
 886         @ln -s $(srctree) $(MODLIB)/source
 887         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 888                 rm -f $(MODLIB)/build ; \
 889                 ln -s $(objtree) $(MODLIB)/build ; \
 890         fi
 891         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 892
 893 # If System.map exists, run depmod.  This deliberately does not have a
 894 # dependency on System.map since that would run the dependency tree on
 895 # vmlinux.  This depmod is only for convenience to give the initial
 896 # boot a modules.dep even before / is mounted read-write.  However the
 897 # boot script depmod is the master version.
 898 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 899 depmod_opts     :=
 900 else
 901 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 902 endif
 903 .PHONY: _modinst_post
 904 _modinst_post: _modinst_
 905         if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 906
 907 else # CONFIG_MODULES
 908
 909 # Modules not configured
 910 # ---------------------------------------------------------------------------
 911
 912 modules modules_install: FORCE
 913         @echo
 914         @echo "The present kernel configuration has modules disabled."
 915         @echo "Type 'make config' and enable loadable module support."
 916         @echo "Then build a kernel with module support enabled."
 917         @echo
 918         @exit 1
 919
 920 endif # CONFIG_MODULES
 921
 922 # Generate asm-offsets.h
 923 # ---------------------------------------------------------------------------
 924
 925 define filechk_gen-asm-offsets
 926         (set -e; \
 927          echo "#ifndef __ASM_OFFSETS_H__"; \
 928          echo "#define __ASM_OFFSETS_H__"; \
 929          echo "/*"; \
 930          echo " * DO NOT MODIFY."; \
 931          echo " *"; \
 932          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 933          echo " *"; \
 934          echo " */"; \
 935          echo ""; \
 936          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 937          echo ""; \
 938          echo "#endif" )
 939 endef
 940
 941
 942 ###
 943 # Cleaning is done on three levels.
 944 # make clean     Delete most generated files
 945 #                Leave enough to build external modules
 946 # make mrproper  Delete the current configuration, and all generated files
 947 # make distclean Remove editor backup files, patch leftover files and the like
 948
 949 # Directories & files removed with 'make clean'
 950 CLEAN_DIRS  += $(MODVERDIR)
 951 CLEAN_FILES +=  vmlinux System.map \
 952                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 953
 954 # Directories & files removed with 'make mrproper'
 955 MRPROPER_DIRS  += include/config include2
 956 MRPROPER_FILES += .config .config.old include/asm .version \
 957                   include/linux/autoconf.h include/linux/version.h \
 958                   Module.symvers tags TAGS cscope*
 959
 960 # clean - Delete most, but leave enough to build external modules
 961 #
 962 clean: rm-dirs  := $(CLEAN_DIRS)
 963 clean: rm-files := $(CLEAN_FILES)
 964 clean-dirs      := $(addprefix _clean_,$(vmlinux-alldirs))
 965
 966 .PHONY: $(clean-dirs) clean archclean
 967 $(clean-dirs):
 968         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 969
 970 clean: archclean $(clean-dirs)
 971         $(call cmd,rmdirs)
 972         $(call cmd,rmfiles)
 973         @find . $(RCS_FIND_IGNORE) \
 974                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 975                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 976                 -type f -print | xargs rm -f
 977
 978 # mrproper - Delete all generated files, including .config
 979 #
 980 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 981 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 982 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 983
 984 .PHONY: $(mrproper-dirs) mrproper archmrproper
 985 $(mrproper-dirs):
 986         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 987
 988 mrproper: clean archmrproper $(mrproper-dirs)
 989         $(call cmd,rmdirs)
 990         $(call cmd,rmfiles)
 991
 992 # distclean
 993 #
 994 .PHONY: distclean
 995
 996 distclean: mrproper
 997         @find $(srctree) $(RCS_FIND_IGNORE) \
 998                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 999                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1000                 -o -name '.*.rej' -o -size 0 \
1001                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1002                 -type f -print | xargs rm -f
1003
1004
1005 # Packaging of the kernel to various formats
1006 # ---------------------------------------------------------------------------
1007 # rpm target kept for backward compatibility
1008 package-dir     := $(srctree)/scripts/package
1009
1010 .PHONY: %-pkg rpm
1011
1012 %pkg: FORCE
1013         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1014 rpm: FORCE
1015         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1016
1017
1018 # Brief documentation of the typical targets used
1019 # ---------------------------------------------------------------------------
1020
1021 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1022 boards := $(notdir $(boards))
1023
1024 help:
1025         @echo  'Cleaning targets:'
1026         @echo  '  clean           - remove most generated files but keep the config'
1027         @echo  '  mrproper        - remove all generated files + config + various backup files'
1028         @echo  ''
1029         @echo  'Configuration targets:'
1030         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1031         @echo  ''
1032         @echo  'Other generic targets:'
1033         @echo  '  all             - Build all targets marked with [*]'
1034         @echo  '* vmlinux         - Build the bare kernel'
1035         @echo  '* modules         - Build all modules'
1036         @echo  '  modules_install - Install all modules'
1037         @echo  '  dir/            - Build all files in dir and below'
1038         @echo  '  dir/file.[ois]  - Build specified target only'
1039         @echo  '  dir/file.ko     - Build module including final link'
1040         @echo  '  rpm             - Build a kernel as an RPM package'
1041         @echo  '  tags/TAGS       - Generate tags file for editors'
1042         @echo  '  cscope          - Generate cscope index'
1043         @echo  ''
1044         @echo  'Static analysers'
1045         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1046         @echo  '                    and init sections from non-init sections'
1047         @echo  '  checkstack      - Generate a list of stack hogs'
1048         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1049         @echo  ''
1050         @echo  'Kernel packaging:'
1051         @$(MAKE) -f $(package-dir)/Makefile help
1052         @echo  ''
1053         @echo  'Documentation targets:'
1054         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1055         @echo  ''
1056         @echo  'Architecture specific targets ($(ARCH)):'
1057         @$(if $(archhelp),$(archhelp),\
1058                 echo '  No architecture specific help defined for $(ARCH)')
1059         @echo  ''
1060         @$(if $(boards), \
1061                 $(foreach b, $(boards), \
1062                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1063                 echo '')
1064
1065         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1066         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1067         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1068         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1069         @echo  ''
1070         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1071         @echo  'For further info see the ./README file'
1072
1073
1074 # Documentation targets
1075 # ---------------------------------------------------------------------------
1076 %docs: scripts_basic FORCE
1077         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1078
1079 else # KBUILD_EXTMOD
1080
1081 ###
1082 # External module support.
1083 # When building external modules the kernel used as basis is considered
1084 # read-only, and no consistency checks are made and the make
1085 # system is not used on the basis kernel. If updates are required
1086 # in the basis kernel ordinary make commands (without M=...) must
1087 # be used.
1088 #
1089 # The following are the only valid targets when building external
1090 # modules.
1091 # make M=dir clean     Delete all automatically generated files
1092 # make M=dir modules   Make all modules in specified dir
1093 # make M=dir           Same as 'make M=dir modules'
1094 # make M=dir modules_install
1095 #                      Install the modules build in the module directory
1096 #                      Assumes install directory is already created
1097
1098 # We are always building modules
1099 KBUILD_MODULES := 1
1100 .PHONY: crmodverdir
1101 crmodverdir:
1102         $(Q)mkdir -p $(MODVERDIR)
1103
1104 .PHONY: $(objtree)/Module.symvers
1105 $(objtree)/Module.symvers:
1106         @test -e $(objtree)/Module.symvers || ( \
1107         echo; \
1108         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1109         echo "           is missing; modules will have no dependencies and modversions."; \
1110         echo )
1111
1112 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1113 .PHONY: $(module-dirs) modules
1114 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1115         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1116
1117 modules: $(module-dirs)
1118         @echo '  Building modules, stage 2.';
1119         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1120
1121 .PHONY: modules_install
1122 modules_install:
1123         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1124
1125 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1126
1127 .PHONY: $(clean-dirs) clean
1128 $(clean-dirs):
1129         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1130
1131 clean:  rm-dirs := $(MODVERDIR)
1132 clean: $(clean-dirs)
1133         $(call cmd,rmdirs)
1134         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1135                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1136                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1137                 -type f -print | xargs rm -f
1138
1139 help:
1140         @echo  '  Building external modules.'
1141         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1142         @echo  ''
1143         @echo  '  modules         - default target, build the module(s)'
1144         @echo  '  modules_install - install the module'
1145         @echo  '  clean           - remove generated files in module directory only'
1146         @echo  ''
1147 endif # KBUILD_EXTMOD
1148
1149 # Generate tags for editors
1150 # ---------------------------------------------------------------------------
1151
1152 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1153 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1154 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1155
1156 ifeq ($(src),$(obj))
1157 __srctree =
1158 else
1159 __srctree = $(srctree)/
1160 endif
1161
1162 define all-sources
1163         ( find $(__srctree) $(RCS_FIND_IGNORE) \
1164                \( -name include -o -name arch \) -prune -o \
1165                -name '*.[chS]' -print; \
1166           find $(__srctree)arch/$(ARCH) $(RCS_FIND_IGNORE) \
1167                -name '*.[chS]' -print; \
1168           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1169                -name '*.[chS]' -print; \
1170           find $(__srctree)include $(RCS_FIND_IGNORE) \
1171                \( -name config -o -name 'asm-*' \) -prune \
1172                -o -name '*.[chS]' -print; \
1173           find $(__srctree)include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1174                -name '*.[chS]' -print; \
1175           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1176                -name '*.[chS]' -print )
1177 endef
1178
1179 quiet_cmd_cscope-file = FILELST cscope.files
1180       cmd_cscope-file = $(all-sources) > cscope.files
1181
1182 quiet_cmd_cscope = MAKE    cscope.out
1183       cmd_cscope = cscope -k -b -q
1184
1185 cscope: FORCE
1186         $(call cmd,cscope-file)
1187         $(call cmd,cscope)
1188
1189 quiet_cmd_TAGS = MAKE   $@
1190 cmd_TAGS = $(all-sources) | etags -
1191
1192 #       Exuberant ctags works better with -I
1193
1194 quiet_cmd_tags = MAKE   $@
1195 define cmd_tags
1196         rm -f $@; \
1197         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1198         $(all-sources) | xargs ctags $$CTAGSF -a
1199 endef
1200
1201 TAGS: FORCE
1202         $(call cmd,TAGS)
1203
1204 tags: FORCE
1205         $(call cmd,tags)
1206
1207
1208 # Scripts to check various things for consistency
1209 # ---------------------------------------------------------------------------
1210
1211 configcheck:
1212         find * $(RCS_FIND_IGNORE) \
1213                 -name '*.[hcS]' -type f -print | sort \
1214                 | xargs $(PERL) -w scripts/checkconfig.pl
1215
1216 includecheck:
1217         find * $(RCS_FIND_IGNORE) \
1218                 -name '*.[hcS]' -type f -print | sort \
1219                 | xargs $(PERL) -w scripts/checkincludes.pl
1220
1221 versioncheck:
1222         find * $(RCS_FIND_IGNORE) \
1223                 -name '*.[hcS]' -type f -print | sort \
1224                 | xargs $(PERL) -w scripts/checkversion.pl
1225
1226 buildcheck:
1227         $(PERL) $(srctree)/scripts/reference_discarded.pl
1228         $(PERL) $(srctree)/scripts/reference_init.pl
1229
1230 namespacecheck:
1231         $(PERL) $(srctree)/scripts/namespace.pl
1232
1233 endif #ifeq ($(config-targets),1)
1234 endif #ifeq ($(mixed-targets),1)
1235
1236 .PHONY: checkstack
1237 checkstack:
1238         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1239         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1240
1241 kernelrelease:
1242         @echo $(KERNELRELEASE)
1243
1244 # FIXME Should go into a make.lib or something
1245 # ===========================================================================
1246
1247 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1248       cmd_rmdirs = rm -rf $(rm-dirs)
1249
1250 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1251       cmd_rmfiles = rm -f $(rm-files)
1252
1253
1254 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1255           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1256           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1257
1258 quiet_cmd_as_o_S = AS      $@
1259 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1260
1261 # read all saved command lines
1262
1263 targets := $(wildcard $(sort $(targets)))
1264 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1265
1266 ifneq ($(cmd_files),)
1267   $(cmd_files): ;       # Do not try to update included dependency files
1268   include $(cmd_files)
1269 endif
1270
1271 # Execute command and generate cmd file
1272 if_changed = $(if $(strip $? \
1273                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1274                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1275         @set -e; \
1276         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1277         $(cmd_$(1)); \
1278         echo 'cmd_$@ := $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).cmd)
1279
1280
1281 # execute the command and also postprocess generated .d dependencies
1282 # file
1283 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1284                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1285                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1286         $(Q)set -e; \
1287         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1288         $(cmd_$(1)); \
1289         scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1290         rm -f $(depfile); \
1291         mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1292
1293 # Usage: $(call if_changed_rule,foo)
1294 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1295 # and if so will execute $(rule_foo)
1296
1297 if_changed_rule = $(if $(strip $? \
1298                                $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1299                                $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1300                        $(Q)$(rule_$(1)))
1301
1302 # If quiet is set, only print short version of command
1303
1304 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1305
1306 # filechk is used to check if the content of a generated file is updated.
1307 # Sample usage:
1308 # define filechk_sample
1309 #       echo $KERNELRELEASE
1310 # endef
1311 # version.h : Makefile
1312 #       $(call filechk,sample)
1313 # The rule defined shall write to stdout the content of the new file.
1314 # The existing file will be compared with the new one.
1315 # - If no file exist it is created
1316 # - If the content differ the new file is used
1317 # - If they are equal no change, and no timestamp update
1318
1319 define filechk
1320         @set -e;                                \
1321         echo '  CHK     $@';                    \
1322         mkdir -p $(dir $@);                     \
1323         $(filechk_$(1)) < $< > $@.tmp;          \
1324         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
1325                 rm -f $@.tmp;                   \
1326         else                                    \
1327                 echo '  UPD     $@';            \
1328                 mv -f $@.tmp $@;                \
1329         fi
1330 endef
1331
1332 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1333 # Usage:
1334 # $(Q)$(MAKE) $(build)=dir
1335 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1336
1337 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1338 # Usage:
1339 # $(Q)$(MAKE) $(clean)=dir
1340 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1341
1342 #       $(call descend,<dir>,<target>)
1343 #       Recursively call a sub-make in <dir> with target <target>
1344 # Usage is deprecated, because make does not see this as an invocation of make.
1345 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1346
1347 endif   # skip-makefile
1348
1349 FORCE: