Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 10
   4 EXTRAVERSION =-rc3
   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 of
  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 := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntax'es are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
  82
  83
  84 # KBUILD_SRC is set on invocation of make in OBJ directory
  85 # KBUILD_SRC is not intended to be used by the regular user (for now)
  86 ifeq ($(KBUILD_SRC),)
  87
  88 # OK, Make called in directory where kernel src resides
  89 # Do we want to locate output files in a separate directory?
  90 ifdef O
  91   ifeq ("$(origin O)", "command line")
  92     KBUILD_OUTPUT := $(O)
  93   endif
  94 endif
  95
  96 # That's our default target when none is given on the command line
  97 .PHONY: _all
  98 _all:
  99
 100 ifneq ($(KBUILD_OUTPUT),)
 101 # Invoke a second make in the output directory, passing relevant variables
 102 # check that the output directory actually exists
 103 saved-output := $(KBUILD_OUTPUT)
 104 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 105 $(if $(KBUILD_OUTPUT),, \
 106      $(error output directory "$(saved-output)" does not exist))
 107
 108 .PHONY: $(MAKECMDGOALS)
 109
 110 $(filter-out _all,$(MAKECMDGOALS)) _all:
 111         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT)         \
 112         KBUILD_SRC=$(CURDIR)         KBUILD_VERBOSE=$(KBUILD_VERBOSE)   \
 113         KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)"   \
 114         -f $(CURDIR)/Makefile $@
 115
 116 # Leave processing to above invocation of make
 117 skip-makefile := 1
 118 endif # ifneq ($(KBUILD_OUTPUT),)
 119 endif # ifeq ($(KBUILD_SRC),)
 120
 121 # We process the rest of the Makefile if this is the final invocation of make
 122 ifeq ($(skip-makefile),)
 123
 124 # If building an external module we do not care about the all: rule
 125 # but instead _all depend on modules
 126 .PHONY: all
 127 ifeq ($(KBUILD_EXTMOD),)
 128 _all: all
 129 else
 130 _all: modules
 131 endif
 132
 133 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 134 TOPDIR          := $(srctree)
 135 # FIXME - TOPDIR is obsolete, use srctree/objtree
 136 objtree         := $(CURDIR)
 137 src             := $(srctree)
 138 obj             := $(objtree)
 139
 140 VPATH           := $(srctree)
 141
 142 export srctree objtree VPATH TOPDIR
 143
 144 nullstring :=
 145 space      := $(nullstring) # end of line
 146
 147 # Take the contents of any files called localversion* and the config
 148 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
 149 # careful not to include files twice if building in the source
 150 # directory. LOCALVERSION from the command line override all of this
 151
 152 ifeq ($(objtree),$(srctree))
 153 localversion-files := $(wildcard $(srctree)/localversion*)
 154 else
 155 localversion-files := $(wildcard $(objtree)/localversion* $(srctree)/localversion*)
 156 endif
 157
 158 LOCALVERSION = $(subst $(space),, \
 159                $(shell cat /dev/null $(localversion-files:%~=)) \
 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 gcc-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 gcc-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 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
 335 MODFLAGS        = -DMODULE
 336 CFLAGS_MODULE   = $(MODFLAGS)
 337 AFLAGS_MODULE   = $(MODFLAGS)
 338 LDFLAGS_MODULE  = -r
 339 CFLAGS_KERNEL   =
 340 AFLAGS_KERNEL   =
 341
 342 NOSTDINC_FLAGS  = -nostdinc -iwithprefix include
 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 AFLAGS          := -D__ASSEMBLY__
 354
 355 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
 356         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 357         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 358         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 359
 360 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 361 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 362 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 363
 364 # When compiling out-of-tree modules, put MODVERDIR in the module
 365 # tree rather than in the kernel tree. The kernel tree might
 366 # even be read-only.
 367 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 368
 369 # The temporary file to save gcc -MD generated dependencies must not
 370 # contain a comma
 371 comma := ,
 372 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 373
 374 # Files to ignore in find ... statements
 375
 376 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc \) -prune -o
 377 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc
 378
 379 # ===========================================================================
 380 # Rules shared between *config targets and build targets
 381
 382 # Basic helpers built in scripts/
 383 .PHONY: scripts_basic
 384 scripts_basic:
 385         $(Q)$(MAKE) $(build)=scripts/basic
 386
 387 .PHONY: outputmakefile
 388 # outputmakefile generate a Makefile to be placed in output directory, if
 389 # using a seperate output directory. This allows convinient use
 390 # of make in output directory
 391 outputmakefile:
 392         $(Q)if /usr/bin/env test ! $(srctree) -ef $(objtree); then \
 393         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 394             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 395             > $(objtree)/Makefile;                                 \
 396             echo '  GEN    $(objtree)/Makefile';                   \
 397         fi
 398
 399 # To make sure we do not include .config for any of the *config targets
 400 # catch them early, and hand them over to scripts/kconfig/Makefile
 401 # It is allowed to specify more targets when calling make, including
 402 # mixing *config targets and build targets.
 403 # For example 'make oldconfig all'.
 404 # Detect when mixed targets is specified, and make a second invocation
 405 # of make so .config is not included in this case either (for *config).
 406
 407 no-dot-config-targets := clean mrproper distclean \
 408                          cscope TAGS tags help %docs check%
 409
 410 config-targets := 0
 411 mixed-targets  := 0
 412 dot-config     := 1
 413
 414 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 415         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 416                 dot-config := 0
 417         endif
 418 endif
 419
 420 ifeq ($(KBUILD_EXTMOD),)
 421         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 422                 config-targets := 1
 423                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 424                         mixed-targets := 1
 425                 endif
 426         endif
 427 endif
 428
 429 ifeq ($(mixed-targets),1)
 430 # ===========================================================================
 431 # We're called with mixed targets (*config and build targets).
 432 # Handle them one by one.
 433
 434 %:: FORCE
 435         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 436
 437 else
 438 ifeq ($(config-targets),1)
 439 # ===========================================================================
 440 # *config targets only - make sure prerequisites are updated, and descend
 441 # in scripts/kconfig to make the *config target
 442
 443 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 444 # KBUILD_DEFCONFIG may point out an alternative default configuration
 445 # used for 'make defconfig'
 446 include $(srctree)/arch/$(ARCH)/Makefile
 447 export KBUILD_DEFCONFIG
 448
 449 config: scripts_basic outputmakefile FORCE
 450         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 451 %config: scripts_basic outputmakefile FORCE
 452         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 453
 454 else
 455 # ===========================================================================
 456 # Build targets only - this includes vmlinux, arch specific targets, clean
 457 # targets and others. In general all targets except *config targets.
 458
 459 ifeq ($(KBUILD_EXTMOD),)
 460 # Additional helpers built in scripts/
 461 # Carefully list dependencies so we do not try to build scripts twice
 462 # in parrallel
 463 .PHONY: scripts
 464 scripts: scripts_basic include/config/MARKER
 465         $(Q)$(MAKE) $(build)=$(@)
 466
 467 scripts_basic: include/linux/autoconf.h
 468
 469 # Objects we will link into vmlinux / subdirs we need to visit
 470 init-y          := init/
 471 drivers-y       := drivers/ sound/
 472 net-y           := net/
 473 libs-y          := lib/
 474 core-y          := usr/
 475 endif # KBUILD_EXTMOD
 476
 477 ifeq ($(dot-config),1)
 478 # In this section, we need .config
 479
 480 # Read in dependencies to all Kconfig* files, make sure to run
 481 # oldconfig if changes are detected.
 482 -include .config.cmd
 483
 484 include .config
 485
 486 # If .config needs to be updated, it will be done via the dependency
 487 # that autoconf has on .config.
 488 # To avoid any implicit rule to kick in, define an empty command
 489 .config: ;
 490
 491 # If .config is newer than include/linux/autoconf.h, someone tinkered
 492 # with it and forgot to run make oldconfig
 493 include/linux/autoconf.h: .config
 494         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 495 else
 496 # Dummy target needed, because used as prerequisite
 497 include/linux/autoconf.h: ;
 498 endif
 499
 500 # The all: target is the default when no target is given on the
 501 # command line.
 502 # This allow a user to issue only 'make' to build a kernel including modules
 503 # Defaults vmlinux but it is usually overriden in the arch makefile
 504 all: vmlinux
 505
 506 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 507 CFLAGS          += -Os
 508 else
 509 CFLAGS          += -O2
 510 endif
 511
 512 #Add align options if CONFIG_CC_* is not equal to 0
 513 add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
 514 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
 515 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
 516 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 517 CFLAGS          += $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 518
 519 ifdef CONFIG_FRAME_POINTER
 520 CFLAGS          += -fno-omit-frame-pointer
 521 else
 522 CFLAGS          += -fomit-frame-pointer
 523 endif
 524
 525 ifdef CONFIG_DEBUG_INFO
 526 CFLAGS          += -g
 527 endif
 528
 529 include $(srctree)/arch/$(ARCH)/Makefile
 530
 531 # warn about C99 declaration after statement
 532 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 533
 534 # Default kernel image to build when no specific target is given.
 535 # KBUILD_IMAGE may be overruled on the commandline or
 536 # set in the environment
 537 # Also any assingments in arch/$(ARCH)/Makefiel take precedence over
 538 # this default value
 539 export KBUILD_IMAGE ?= vmlinux
 540
 541 #
 542 # INSTALL_PATH specifies where to place the updated kernel and system map
 543 # images.  Uncomment if you want to place them anywhere other than root.
 544 #
 545
 546 #export INSTALL_PATH=/boot
 547
 548 #
 549 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 550 # relocations required by build roots.  This is not defined in the
 551 # makefile but the arguement can be passed to make if needed.
 552 #
 553
 554 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 555 export MODLIB
 556
 557
 558 ifeq ($(KBUILD_EXTMOD),)
 559 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 560
 561 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 562                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 563                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 564
 565 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 566                      $(init-n) $(init-) \
 567                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 568                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 569
 570 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 571 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 572 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 573 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 574 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 575 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 576 libs-y          := $(libs-y1) $(libs-y2)
 577
 578 # Build vmlinux
 579 # ---------------------------------------------------------------------------
 580 # vmlinux is build from the objects selected by $(vmlinux-init) and
 581 # $(vmlinux-main). Most are built-in.o files from top-level directories
 582 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 583 # Ordering when linking is important, and $(vmlinux-init) must be first.
 584 #
 585 # vmlinux
 586 #   ^
 587 #   |
 588 #   +-< $(vmlinux-init)
 589 #   |   +--< init/version.o + more
 590 #   |
 591 #   +--< $(vmlinux-main)
 592 #   |    +--< driver/built-in.o mm/built-in.o + more
 593 #   |
 594 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 595 #
 596 # vmlinux version (uname -v) cannot be updated during normal
 597 # descending-into-subdirs phase since we do not yet know if we need to
 598 # update vmlinux.
 599 # Therefore this step is delayed until just before final link of vmlinux -
 600 # except in the kallsyms case where it is done just before adding the
 601 # symbols to the kernel.
 602 #
 603 # System.map is generated to document addresses of all kernel symbols
 604
 605 vmlinux-init := $(head-y) $(init-y)
 606 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 607 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 608 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 609
 610 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 611 # May be overridden by arch/$(ARCH)/Makefile
 612 quiet_cmd_vmlinux__ ?= LD      $@
 613       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 614       -T $(vmlinux-lds) $(vmlinux-init)                          \
 615       --start-group $(vmlinux-main) --end-group                  \
 616       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 617
 618 # Generate new vmlinux version
 619 quiet_cmd_vmlinux_version = GEN     .version
 620       cmd_vmlinux_version = set -e;                     \
 621         . $(srctree)/scripts/mkversion > .tmp_version;  \
 622         mv -f .tmp_version .version;                    \
 623         $(MAKE) $(build)=init
 624
 625 # Generate System.map
 626 quiet_cmd_sysmap = SYSMAP
 627       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 628
 629 # Link of vmlinux
 630 # If CONFIG_KALLSYMS is set .version is already updated
 631 # Generate System.map and verify that the content is consistent
 632
 633 define rule_vmlinux__
 634         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 635
 636         $(call cmd,vmlinux__)
 637         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 638
 639         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 640           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 641         $(cmd_sysmap) $@ System.map;                    \
 642         if [ $$? -ne 0 ]; then                          \
 643                 rm -f $@;                               \
 644                 /bin/false;                             \
 645         fi;
 646         $(verify_kallsyms)
 647 endef
 648
 649
 650 ifdef CONFIG_KALLSYMS
 651 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 652 # It's a three stage process:
 653 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 654 #   empty
 655 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 656 #   the right size - vmlinux version (uname -v) is updated during this step
 657 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 658 #   but due to the added section, some addresses have shifted.
 659 #   From here, we generate a correct .tmp_kallsyms2.o
 660 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 661 # o Verify that the System.map from vmlinux matches the map from
 662 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 663 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 664 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 665 #   temporary bypass to allow the kernel to be built while the
 666 #   maintainers work out what went wrong with kallsyms.
 667
 668 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 669 last_kallsyms := 3
 670 else
 671 last_kallsyms := 2
 672 endif
 673
 674 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 675
 676 define verify_kallsyms
 677         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 678           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 679           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 680         $(Q)cmp -s System.map .tmp_System.map ||              \
 681                 (echo Inconsistent kallsyms data;             \
 682                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 683                  rm .tmp_kallsyms* ; /bin/false )
 684 endef
 685
 686 # Update vmlinux version before link
 687 # Use + in front of this rule to silent warning about make -j1
 688 cmd_ksym_ld = $(cmd_vmlinux__)
 689 define rule_ksym_ld
 690         +$(call cmd,vmlinux_version)
 691         $(call cmd,vmlinux__)
 692         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 693 endef
 694
 695 # Generate .S file with all kernel symbols
 696 quiet_cmd_kallsyms = KSYM    $@
 697       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 698                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 699
 700 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 701         $(call if_changed_dep,as_o_S)
 702
 703 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 704         $(call cmd,kallsyms)
 705
 706 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 707 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 708         $(call if_changed_rule,ksym_ld)
 709
 710 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 711         $(call if_changed,vmlinux__)
 712
 713 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 714         $(call if_changed,vmlinux__)
 715
 716 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 717 $(KALLSYMS): scripts ;
 718
 719 endif # ifdef CONFIG_KALLSYMS
 720
 721 # vmlinux image - including updated kernel symbols
 722 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 723         $(call if_changed_rule,vmlinux__)
 724
 725 # The actual objects are generated when descending,
 726 # make sure no implicit rule kicks in
 727 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 728
 729 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 730 # Preset locale variables to speed up the build process. Limit locale
 731 # tweaks to this spot to avoid wrong language settings when running
 732 # make menuconfig etc.
 733 # Error messages still appears in the original language
 734
 735 .PHONY: $(vmlinux-dirs)
 736 $(vmlinux-dirs): prepare-all scripts
 737         $(Q)$(MAKE) $(build)=$@
 738
 739 # Things we need to do before we recursively start building the kernel
 740 # or the modules are listed in "prepare-all".
 741 # A multi level approach is used. prepare1 is updated first, then prepare0.
 742 # prepare-all is the collection point for the prepare targets.
 743
 744 .PHONY: prepare-all prepare prepare0 prepare1 prepare2
 745
 746 # prepare2 is used to check if we are building in a separate output directory,
 747 # and if so do:
 748 # 1) Check that make has not been executed in the kernel src $(srctree)
 749 # 2) Create the include2 directory, used for the second asm symlink
 750
 751 prepare2:
 752 ifneq ($(KBUILD_SRC),)
 753         @echo '  Using $(srctree) as source for kernel'
 754         $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
 755                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 756                 echo "  in the '$(srctree)' directory.";\
 757                 /bin/false; \
 758         fi;
 759         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 760         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 761 endif
 762
 763 # prepare1 creates a makefile if using a separate output directory
 764 prepare1: prepare2 outputmakefile
 765
 766 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
 767 ifneq ($(KBUILD_MODULES),)
 768         $(Q)rm -rf $(MODVERDIR)
 769         $(Q)mkdir -p $(MODVERDIR)
 770 endif
 771
 772 # All the preparing..
 773 prepare-all: prepare0 prepare
 774
 775 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 776 #       done in arch/$(ARCH)/kernel/Makefile
 777
 778 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 779
 780 # Single targets
 781 # ---------------------------------------------------------------------------
 782
 783 %.s: %.c scripts FORCE
 784         $(Q)$(MAKE) $(build)=$(@D) $@
 785 %.i: %.c scripts FORCE
 786         $(Q)$(MAKE) $(build)=$(@D) $@
 787 %.o: %.c scripts FORCE
 788         $(Q)$(MAKE) $(build)=$(@D) $@
 789 %/:      scripts prepare FORCE
 790         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 791 %.lst: %.c scripts FORCE
 792         $(Q)$(MAKE) $(build)=$(@D) $@
 793 %.s: %.S scripts FORCE
 794         $(Q)$(MAKE) $(build)=$(@D) $@
 795 %.o: %.S scripts FORCE
 796         $(Q)$(MAKE) $(build)=$(@D) $@
 797
 798 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 799 #       hard to detect, but I suppose "make mrproper" is a good idea
 800 #       before switching between archs anyway.
 801
 802 include/asm:
 803         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 804         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 805         @ln -fsn asm-$(ARCH) $@
 806
 807 #       Split autoconf.h into include/linux/config/*
 808
 809 include/config/MARKER: include/linux/autoconf.h
 810         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 811         @scripts/basic/split-include include/linux/autoconf.h include/config
 812         @touch $@
 813
 814 # Generate some files
 815 # ---------------------------------------------------------------------------
 816
 817 # KERNELRELEASE can change from a few different places, meaning version.h
 818 # needs to be updated, so this check is forced on all builds
 819
 820 uts_len := 64
 821
 822 define filechk_version.h
 823         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 824           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 825           exit 1; \
 826         fi; \
 827         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 828           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 829          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 830         )
 831 endef
 832
 833 include/linux/version.h: $(srctree)/Makefile FORCE
 834         $(call filechk,version.h)
 835
 836 # ---------------------------------------------------------------------------
 837
 838 .PHONY: depend dep
 839 depend dep:
 840         @echo '*** Warning: make $@ is unnecessary now.'
 841
 842 # ---------------------------------------------------------------------------
 843 # Modules
 844
 845 ifdef CONFIG_MODULES
 846
 847 #       By default, build modules as well
 848
 849 all: modules
 850
 851 #       Build modules
 852
 853 .PHONY: modules
 854 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 855         @echo '  Building modules, stage 2.';
 856         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 857
 858
 859 # Target to prepare building external modules
 860 .PHONY: modules_prepare
 861 modules_prepare: prepare-all scripts
 862
 863 # Target to install modules
 864 .PHONY: modules_install
 865 modules_install: _modinst_ _modinst_post
 866
 867 .PHONY: _modinst_
 868 _modinst_:
 869         @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
 870                 echo "Warning: you may need to install module-init-tools"; \
 871                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 872                 sleep 1; \
 873         fi
 874         @rm -rf $(MODLIB)/kernel
 875         @rm -f $(MODLIB)/source
 876         @mkdir -p $(MODLIB)/kernel
 877         @ln -s $(srctree) $(MODLIB)/source
 878         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 879                 rm -f $(MODLIB)/build ; \
 880                 ln -s $(objtree) $(MODLIB)/build ; \
 881         fi
 882         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 883
 884 # If System.map exists, run depmod.  This deliberately does not have a
 885 # dependency on System.map since that would run the dependency tree on
 886 # vmlinux.  This depmod is only for convenience to give the initial
 887 # boot a modules.dep even before / is mounted read-write.  However the
 888 # boot script depmod is the master version.
 889 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 890 depmod_opts     :=
 891 else
 892 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 893 endif
 894 .PHONY: _modinst_post
 895 _modinst_post: _modinst_
 896         if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 897
 898 else # CONFIG_MODULES
 899
 900 # Modules not configured
 901 # ---------------------------------------------------------------------------
 902
 903 modules modules_install: FORCE
 904         @echo
 905         @echo "The present kernel configuration has modules disabled."
 906         @echo "Type 'make config' and enable loadable module support."
 907         @echo "Then build a kernel with module support enabled."
 908         @echo
 909         @exit 1
 910
 911 endif # CONFIG_MODULES
 912
 913 # Generate asm-offsets.h
 914 # ---------------------------------------------------------------------------
 915
 916 define filechk_gen-asm-offsets
 917         (set -e; \
 918          echo "#ifndef __ASM_OFFSETS_H__"; \
 919          echo "#define __ASM_OFFSETS_H__"; \
 920          echo "/*"; \
 921          echo " * DO NOT MODIFY."; \
 922          echo " *"; \
 923          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 924          echo " *"; \
 925          echo " */"; \
 926          echo ""; \
 927          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 928          echo ""; \
 929          echo "#endif" )
 930 endef
 931
 932
 933 ###
 934 # Cleaning is done on three levels.
 935 # make clean     Delete most generated files
 936 #                Leave enough to build external modules
 937 # make mrproper  Delete the current configuration, and all generated files
 938 # make distclean Remove editor backup files, patch leftover files and the like
 939
 940 # Directories & files removed with 'make clean'
 941 CLEAN_DIRS  += $(MODVERDIR)
 942 CLEAN_FILES +=  vmlinux System.map \
 943                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 944
 945 # Directories & files removed with 'make mrproper'
 946 MRPROPER_DIRS  += include/config include2
 947 MRPROPER_FILES += .config .config.old include/asm .version \
 948                   include/linux/autoconf.h include/linux/version.h \
 949                   Module.symvers tags TAGS cscope*
 950
 951 # clean - Delete most, but leave enough to build external modules
 952 #
 953 clean: rm-dirs  := $(CLEAN_DIRS)
 954 clean: rm-files := $(CLEAN_FILES)
 955 clean-dirs      := $(addprefix _clean_,$(vmlinux-alldirs))
 956
 957 .PHONY: $(clean-dirs) clean archclean
 958 $(clean-dirs):
 959         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 960
 961 clean: archclean $(clean-dirs)
 962         $(call cmd,rmdirs)
 963         $(call cmd,rmfiles)
 964         @find . $(RCS_FIND_IGNORE) \
 965                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 966                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 967                 -type f -print | xargs rm -f
 968
 969 # mrproper - Delete all generated files, including .config
 970 #
 971 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 972 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 973 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 974
 975 .PHONY: $(mrproper-dirs) mrproper archmrproper
 976 $(mrproper-dirs):
 977         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 978
 979 mrproper: clean archmrproper $(mrproper-dirs)
 980         $(call cmd,rmdirs)
 981         $(call cmd,rmfiles)
 982
 983 # distclean
 984 #
 985 .PHONY: distclean
 986
 987 distclean: mrproper
 988         @find $(srctree) $(RCS_FIND_IGNORE) \
 989                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 990                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 991                 -o -name '.*.rej' -o -size 0 \
 992                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 993                 -type f -print | xargs rm -f
 994
 995
 996 # Packaging of the kernel to various formats
 997 # ---------------------------------------------------------------------------
 998 # rpm target kept for backward compatibility
 999 package-dir     := $(srctree)/scripts/package
1000
1001 .PHONY: %-pkg rpm
1002
1003 %pkg: FORCE
1004         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1005 rpm: FORCE
1006         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
1007
1008
1009 # Brief documentation of the typical targets used
1010 # ---------------------------------------------------------------------------
1011
1012 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1013 boards := $(notdir $(boards))
1014
1015 help:
1016         @echo  'Cleaning targets:'
1017         @echo  '  clean           - remove most generated files but keep the config'
1018         @echo  '  mrproper        - remove all generated files + config + various backup files'
1019         @echo  ''
1020         @echo  'Configuration targets:'
1021         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1022         @echo  ''
1023         @echo  'Other generic targets:'
1024         @echo  '  all             - Build all targets marked with [*]'
1025         @echo  '* vmlinux         - Build the bare kernel'
1026         @echo  '* modules         - Build all modules'
1027         @echo  '  modules_install - Install all modules'
1028         @echo  '  dir/            - Build all files in dir and below'
1029         @echo  '  dir/file.[ois]  - Build specified target only'
1030         @echo  '  rpm             - Build a kernel as an RPM package'
1031         @echo  '  tags/TAGS       - Generate tags file for editors'
1032         @echo  '  cscope          - Generate cscope index'
1033         @echo  ''
1034         @echo  'Static analysers'
1035         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1036         @echo  '                    and init sections from non-init sections'
1037         @echo  '  checkstack      - Generate a list of stack hogs'
1038         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1039         @echo  ''
1040         @echo  'Kernel packaging:'
1041         @$(MAKE) -f $(package-dir)/Makefile help
1042         @echo  ''
1043         @echo  'Documentation targets:'
1044         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1045         @echo  ''
1046         @echo  'Architecture specific targets ($(ARCH)):'
1047         @$(if $(archhelp),$(archhelp),\
1048                 echo '  No architecture specific help defined for $(ARCH)')
1049         @echo  ''
1050         @$(if $(boards), \
1051                 $(foreach b, $(boards), \
1052                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1053                 echo '')
1054
1055         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1056         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1057         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1058         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1059         @echo  ''
1060         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1061         @echo  'For further info see the ./README file'
1062
1063
1064 # Documentation targets
1065 # ---------------------------------------------------------------------------
1066 %docs: scripts_basic FORCE
1067         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1068
1069 else # KBUILD_EXTMOD
1070
1071 ###
1072 # External module support.
1073 # When building external modules the kernel used as basis is considered
1074 # read-only, and no consistency checks are made and the make
1075 # system is not used on the basis kernel. If updates are required
1076 # in the basis kernel ordinary make commands (without M=...) must
1077 # be used.
1078 #
1079 # The following are the only valid targets when building external
1080 # modules.
1081 # make M=dir clean     Delete all automatically generated files
1082 # make M=dir modules   Make all modules in specified dir
1083 # make M=dir           Same as 'make M=dir modules'
1084 # make M=dir modules_install
1085 #                      Install the modules build in the module directory
1086 #                      Assumes install directory is already created
1087
1088 # We are always building modules
1089 KBUILD_MODULES := 1
1090 .PHONY: crmodverdir
1091 crmodverdir:
1092         $(Q)mkdir -p $(MODVERDIR)
1093
1094 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1095 .PHONY: $(module-dirs) modules
1096 $(module-dirs): crmodverdir
1097         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1098
1099 modules: $(module-dirs)
1100         @echo '  Building modules, stage 2.';
1101         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1102
1103 .PHONY: modules_install
1104 modules_install:
1105         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1106
1107 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1108
1109 .PHONY: $(clean-dirs) clean
1110 $(clean-dirs):
1111         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1112
1113 clean:  rm-dirs := $(MODVERDIR)
1114 clean: $(clean-dirs)
1115         $(call cmd,rmdirs)
1116         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1117                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1118                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1119                 -type f -print | xargs rm -f
1120
1121 help:
1122         @echo  '  Building external modules.'
1123         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1124         @echo  ''
1125         @echo  '  modules         - default target, build the module(s)'
1126         @echo  '  modules_install - install the module'
1127         @echo  '  clean           - remove generated files in module directory only'
1128         @echo  ''
1129 endif # KBUILD_EXTMOD
1130
1131 # Generate tags for editors
1132 # ---------------------------------------------------------------------------
1133
1134 define all-sources
1135         ( find $(srctree) $(RCS_FIND_IGNORE) \
1136                \( -name include -o -name arch \) -prune -o \
1137                -name '*.[chS]' -print; \
1138           find $(srctree)/arch/$(ARCH) $(RCS_FIND_IGNORE) \
1139                -name '*.[chS]' -print; \
1140           find $(srctree)/security/selinux/include $(RCS_FIND_IGNORE) \
1141                -name '*.[chS]' -print; \
1142           find $(srctree)/include $(RCS_FIND_IGNORE) \
1143                \( -name config -o -name 'asm-*' \) -prune \
1144                -o -name '*.[chS]' -print; \
1145           find $(srctree)/include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1146                -name '*.[chS]' -print; \
1147           find $(srctree)/include/asm-generic $(RCS_FIND_IGNORE) \
1148                -name '*.[chS]' -print )
1149 endef
1150
1151 quiet_cmd_cscope-file = FILELST cscope.files
1152       cmd_cscope-file = $(all-sources) > cscope.files
1153
1154 quiet_cmd_cscope = MAKE    cscope.out
1155       cmd_cscope = cscope -k -b -q
1156
1157 cscope: FORCE
1158         $(call cmd,cscope-file)
1159         $(call cmd,cscope)
1160
1161 quiet_cmd_TAGS = MAKE   $@
1162 cmd_TAGS = $(all-sources) | etags -
1163
1164 #       Exuberant ctags works better with -I
1165
1166 quiet_cmd_tags = MAKE   $@
1167 define cmd_tags
1168         rm -f $@; \
1169         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
1170         $(all-sources) | xargs ctags $$CTAGSF -a
1171 endef
1172
1173 TAGS: FORCE
1174         $(call cmd,TAGS)
1175
1176 tags: FORCE
1177         $(call cmd,tags)
1178
1179
1180 # Scripts to check various things for consistency
1181 # ---------------------------------------------------------------------------
1182
1183 configcheck:
1184         find * $(RCS_FIND_IGNORE) \
1185                 -name '*.[hcS]' -type f -print | sort \
1186                 | xargs $(PERL) -w scripts/checkconfig.pl
1187
1188 includecheck:
1189         find * $(RCS_FIND_IGNORE) \
1190                 -name '*.[hcS]' -type f -print | sort \
1191                 | xargs $(PERL) -w scripts/checkincludes.pl
1192
1193 versioncheck:
1194         find * $(RCS_FIND_IGNORE) \
1195                 -name '*.[hcS]' -type f -print | sort \
1196                 | xargs $(PERL) -w scripts/checkversion.pl
1197
1198 buildcheck:
1199         $(PERL) $(srctree)/scripts/reference_discarded.pl
1200         $(PERL) $(srctree)/scripts/reference_init.pl
1201
1202 namespacecheck:
1203         $(PERL) $(srctree)/scripts/namespace.pl
1204
1205 endif #ifeq ($(config-targets),1)
1206 endif #ifeq ($(mixed-targets),1)
1207
1208 .PHONY: checkstack
1209 checkstack:
1210         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1211         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1212
1213 # FIXME Should go into a make.lib or something
1214 # ===========================================================================
1215
1216 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1217       cmd_rmdirs = rm -rf $(rm-dirs)
1218
1219 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1220       cmd_rmfiles = rm -f $(rm-files)
1221
1222
1223 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1224           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1225           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1226
1227 quiet_cmd_as_o_S = AS      $@
1228 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1229
1230 # read all saved command lines
1231
1232 targets := $(wildcard $(sort $(targets)))
1233 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1234
1235 ifneq ($(cmd_files),)
1236   $(cmd_files): ;       # Do not try to update included dependency files
1237   include $(cmd_files)
1238 endif
1239
1240 # Execute command and generate cmd file
1241 if_changed = $(if $(strip $? \
1242                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1243                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1244         @set -e; \
1245         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1246         $(cmd_$(1)); \
1247         echo 'cmd_$@ := $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).cmd)
1248
1249
1250 # execute the command and also postprocess generated .d dependencies
1251 # file
1252 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1253                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1254                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1255         $(Q)set -e; \
1256         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1257         $(cmd_$(1)); \
1258         scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1259         rm -f $(depfile); \
1260         mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1261
1262 # Usage: $(call if_changed_rule,foo)
1263 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1264 # and if so will execute $(rule_foo)
1265
1266 if_changed_rule = $(if $(strip $? \
1267                                $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1268                                $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1269                        $(Q)$(rule_$(1)))
1270
1271 # If quiet is set, only print short version of command
1272
1273 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1274
1275 # filechk is used to check if the content of a generated file is updated.
1276 # Sample usage:
1277 # define filechk_sample
1278 #       echo $KERNELRELEASE
1279 # endef
1280 # version.h : Makefile
1281 #       $(call filechk,sample)
1282 # The rule defined shall write to stdout the content of the new file.
1283 # The existing file will be compared with the new one.
1284 # - If no file exist it is created
1285 # - If the content differ the new file is used
1286 # - If they are equal no change, and no timestamp update
1287
1288 define filechk
1289         @set -e;                                \
1290         echo '  CHK     $@';                    \
1291         mkdir -p $(dir $@);                     \
1292         $(filechk_$(1)) < $< > $@.tmp;          \
1293         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
1294                 rm -f $@.tmp;                   \
1295         else                                    \
1296                 echo '  UPD     $@';            \
1297                 mv -f $@.tmp $@;                \
1298         fi
1299 endef
1300
1301 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1302 # Usage:
1303 # $(Q)$(MAKE) $(build)=dir
1304 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1305
1306 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1307 # Usage:
1308 # $(Q)$(MAKE) $(clean)=dir
1309 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1310
1311 #       $(call descend,<dir>,<target>)
1312 #       Recursively call a sub-make in <dir> with target <target>
1313 # Usage is deprecated, because make does not see this as an invocation of make.
1314 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1315
1316 endif   # skip-makefile
1317
1318 FORCE: