Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 24
   4 EXTRAVERSION = -rc3
   5 NAME = Arr Matey! A Hairy Bilge Rat!
   6
   7 # *DOCUMENTATION*
   8 # To see a list of typical targets execute "make help"
   9 # More info can be located in ./README
  10 # Comments in this file are targeted only to the developer, do not
  11 # expect to learn how to build the kernel reading this file.
  12
  13 # Do not:
  14 # o  use make's built-in rules and variables
  15 #    (this increases performance and avoid hard-to-debug behavour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # We are using a recursive build, so we need to do a little thinking
  20 # to get the ordering right.
  21 #
  22 # Most importantly: sub-Makefiles should only ever modify files in
  23 # their own directory. If in some directory we have a dependency on
  24 # a file in another dir (which doesn't happen often, but it's often
  25 # unavoidable when linking the built-in.o targets which finally
  26 # turn into vmlinux), we will call a sub make in that other dir, and
  27 # after that we are sure that everything which is in that other dir
  28 # is now up to date.
  29 #
  30 # The only cases where we need to modify files which have global
  31 # effects are thus separated out and done before the recursive
  32 # descending is started. They are now explicitly listed as the
  33 # prepare rule.
  34
  35 # To put more focus on warnings, be less verbose as default
  36 # Use 'make V=1' to see the full commands
  37
  38 ifdef V
  39   ifeq ("$(origin V)", "command line")
  40     KBUILD_VERBOSE = $(V)
  41   endif
  42 endif
  43 ifndef KBUILD_VERBOSE
  44   KBUILD_VERBOSE = 0
  45 endif
  46
  47 # Call a source code checker (by default, "sparse") as part of the
  48 # C compilation.
  49 #
  50 # Use 'make C=1' to enable checking of only re-compiled files.
  51 # Use 'make C=2' to enable checking of *all* source files, regardless
  52 # of whether they are re-compiled or not.
  53 #
  54 # See the file "Documentation/sparse.txt" for more details, including
  55 # where to get the "sparse" utility.
  56
  57 ifdef C
  58   ifeq ("$(origin C)", "command line")
  59     KBUILD_CHECKSRC = $(C)
  60   endif
  61 endif
  62 ifndef KBUILD_CHECKSRC
  63   KBUILD_CHECKSRC = 0
  64 endif
  65
  66 # Use make M=dir to specify directory of external module to build
  67 # Old syntax make ... SUBDIRS=$PWD is still supported
  68 # Setting the environment variable KBUILD_EXTMOD take precedence
  69 ifdef SUBDIRS
  70   KBUILD_EXTMOD ?= $(SUBDIRS)
  71 endif
  72 ifdef M
  73   ifeq ("$(origin M)", "command line")
  74     KBUILD_EXTMOD := $(M)
  75   endif
  76 endif
  77
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(KBUILD_SRC),)
  98
  99 # OK, Make called in directory where kernel src resides
 100 # Do we want to locate output files in a separate directory?
 101 ifdef O
 102   ifeq ("$(origin O)", "command line")
 103     KBUILD_OUTPUT := $(O)
 104   endif
 105 endif
 106
 107 # That's our default target when none is given on the command line
 108 PHONY := _all
 109 _all:
 110
 111 ifneq ($(KBUILD_OUTPUT),)
 112 # Invoke a second make in the output directory, passing relevant variables
 113 # check that the output directory actually exists
 114 saved-output := $(KBUILD_OUTPUT)
 115 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 116 $(if $(KBUILD_OUTPUT),, \
 117      $(error output directory "$(saved-output)" does not exist))
 118 # Check that OUTPUT directory is not the same as where we have kernel src
 119 $(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \
 120      $(error Output directory (O=...) specifies kernel src dir))
 121
 122 PHONY += $(MAKECMDGOALS) sub-make
 123
 124 $(filter-out _all sub-make,$(MAKECMDGOALS)) _all: sub-make
 125         $(Q)@:
 126
 127 sub-make: FORCE
 128         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129         KBUILD_SRC=$(CURDIR) \
 130         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131         $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133 # Leave processing to above invocation of make
 134 skip-makefile := 1
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136 endif # ifeq ($(KBUILD_SRC),)
 137
 138 # We process the rest of the Makefile if this is the final invocation of make
 139 ifeq ($(skip-makefile),)
 140
 141 # If building an external module we do not care about the all: rule
 142 # but instead _all depend on modules
 143 PHONY += all
 144 ifeq ($(KBUILD_EXTMOD),)
 145 _all: all
 146 else
 147 _all: modules
 148 endif
 149
 150 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151 TOPDIR          := $(srctree)
 152 # FIXME - TOPDIR is obsolete, use srctree/objtree
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH TOPDIR
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                   -e s/sh[234].*/sh/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192
 193 ARCH            ?= $(SUBARCH)
 194 CROSS_COMPILE   ?=
 195
 196 # Architecture as present in compile.h
 197 UTS_MACHINE     := $(ARCH)
 198 SRCARCH         := $(ARCH)
 199
 200 # Additional ARCH settings for x86
 201 ifeq ($(ARCH),i386)
 202         SRCARCH := x86
 203 endif
 204 ifeq ($(ARCH),x86_64)
 205         SRCARCH := x86
 206 endif
 207
 208 KCONFIG_CONFIG  ?= .config
 209
 210 # SHELL used by kbuild
 211 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 212           else if [ -x /bin/bash ]; then echo /bin/bash; \
 213           else echo sh; fi ; fi)
 214
 215 HOSTCC       = gcc
 216 HOSTCXX      = g++
 217 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 218 HOSTCXXFLAGS = -O2
 219
 220 # Decide whether to build built-in, modular, or both.
 221 # Normally, just do built-in.
 222
 223 KBUILD_MODULES :=
 224 KBUILD_BUILTIN := 1
 225
 226 #       If we have only "make modules", don't compile built-in objects.
 227 #       When we're building modules with modversions, we need to consider
 228 #       the built-in objects during the descend as well, in order to
 229 #       make sure the checksums are up to date before we record them.
 230
 231 ifeq ($(MAKECMDGOALS),modules)
 232   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 233 endif
 234
 235 #       If we have "make <whatever> modules", compile modules
 236 #       in addition to whatever we do anyway.
 237 #       Just "make" or "make all" shall build modules as well
 238
 239 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 240   KBUILD_MODULES := 1
 241 endif
 242
 243 ifeq ($(MAKECMDGOALS),)
 244   KBUILD_MODULES := 1
 245 endif
 246
 247 export KBUILD_MODULES KBUILD_BUILTIN
 248 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 249
 250 # Beautify output
 251 # ---------------------------------------------------------------------------
 252 #
 253 # Normally, we echo the whole command before executing it. By making
 254 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 255 # $(quiet) to choose other forms of output instead, e.g.
 256 #
 257 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 258 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 259 #
 260 # If $(quiet) is empty, the whole command will be printed.
 261 # If it is set to "quiet_", only the short version will be printed.
 262 # If it is set to "silent_", nothing will be printed at all, since
 263 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 264 #
 265 # A simple variant is to prefix commands with $(Q) - that's useful
 266 # for commands that shall be hidden in non-verbose mode.
 267 #
 268 #       $(Q)ln $@ :<
 269 #
 270 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 271 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 272
 273 ifeq ($(KBUILD_VERBOSE),1)
 274   quiet =
 275   Q =
 276 else
 277   quiet=quiet_
 278   Q = @
 279 endif
 280
 281 # If the user is running make -s (silent mode), suppress echoing of
 282 # commands
 283
 284 ifneq ($(findstring s,$(MAKEFLAGS)),)
 285   quiet=silent_
 286 endif
 287
 288 export quiet Q KBUILD_VERBOSE
 289
 290
 291 # Look for make include files relative to root of kernel src
 292 MAKEFLAGS += --include-dir=$(srctree)
 293
 294 # We need some generic definitions.
 295 include $(srctree)/scripts/Kbuild.include
 296
 297 # Make variables (CC, etc...)
 298
 299 AS              = $(CROSS_COMPILE)as
 300 LD              = $(CROSS_COMPILE)ld
 301 CC              = $(CROSS_COMPILE)gcc
 302 CPP             = $(CC) -E
 303 AR              = $(CROSS_COMPILE)ar
 304 NM              = $(CROSS_COMPILE)nm
 305 STRIP           = $(CROSS_COMPILE)strip
 306 OBJCOPY         = $(CROSS_COMPILE)objcopy
 307 OBJDUMP         = $(CROSS_COMPILE)objdump
 308 AWK             = awk
 309 GENKSYMS        = scripts/genksyms/genksyms
 310 DEPMOD          = /sbin/depmod
 311 KALLSYMS        = scripts/kallsyms
 312 PERL            = perl
 313 CHECK           = sparse
 314
 315 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 316 MODFLAGS        = -DMODULE
 317 CFLAGS_MODULE   = $(MODFLAGS)
 318 AFLAGS_MODULE   = $(MODFLAGS)
 319 LDFLAGS_MODULE  =
 320 CFLAGS_KERNEL   =
 321 AFLAGS_KERNEL   =
 322
 323
 324 # Use LINUXINCLUDE when you must reference the include/ directory.
 325 # Needed to be compatible with the O= option
 326 LINUXINCLUDE    := -Iinclude \
 327                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 328                    -include include/linux/autoconf.h
 329
 330 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 331
 332 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 333                    -fno-strict-aliasing -fno-common \
 334                    -Werror-implicit-function-declaration
 335 KBUILD_AFLAGS   := -D__ASSEMBLY__
 336
 337 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 338 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 339 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 340
 341 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 342 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 343 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 344 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 345
 346 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 347 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 348 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 349
 350 # When compiling out-of-tree modules, put MODVERDIR in the module
 351 # tree rather than in the kernel tree. The kernel tree might
 352 # even be read-only.
 353 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 354
 355 # Files to ignore in find ... statements
 356
 357 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 358 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 359
 360 # ===========================================================================
 361 # Rules shared between *config targets and build targets
 362
 363 # Basic helpers built in scripts/
 364 PHONY += scripts_basic
 365 scripts_basic:
 366         $(Q)$(MAKE) $(build)=scripts/basic
 367
 368 # To avoid any implicit rule to kick in, define an empty command.
 369 scripts/basic/%: scripts_basic ;
 370
 371 PHONY += outputmakefile
 372 # outputmakefile generates a Makefile in the output directory, if using a
 373 # separate output directory. This allows convenient use of make in the
 374 # output directory.
 375 outputmakefile:
 376 ifneq ($(KBUILD_SRC),)
 377         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 378             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 379 endif
 380
 381 # To make sure we do not include .config for any of the *config targets
 382 # catch them early, and hand them over to scripts/kconfig/Makefile
 383 # It is allowed to specify more targets when calling make, including
 384 # mixing *config targets and build targets.
 385 # For example 'make oldconfig all'.
 386 # Detect when mixed targets is specified, and make a second invocation
 387 # of make so .config is not included in this case either (for *config).
 388
 389 no-dot-config-targets := clean mrproper distclean \
 390                          cscope TAGS tags help %docs check% \
 391                          include/linux/version.h headers_% \
 392                          kernelrelease kernelversion
 393
 394 config-targets := 0
 395 mixed-targets  := 0
 396 dot-config     := 1
 397
 398 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 399         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 400                 dot-config := 0
 401         endif
 402 endif
 403
 404 ifeq ($(KBUILD_EXTMOD),)
 405         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 406                 config-targets := 1
 407                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 408                         mixed-targets := 1
 409                 endif
 410         endif
 411 endif
 412
 413 ifeq ($(mixed-targets),1)
 414 # ===========================================================================
 415 # We're called with mixed targets (*config and build targets).
 416 # Handle them one by one.
 417
 418 %:: FORCE
 419         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 420
 421 else
 422 ifeq ($(config-targets),1)
 423 # ===========================================================================
 424 # *config targets only - make sure prerequisites are updated, and descend
 425 # in scripts/kconfig to make the *config target
 426
 427 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 428 # KBUILD_DEFCONFIG may point out an alternative default configuration
 429 # used for 'make defconfig'
 430 include $(srctree)/arch/$(SRCARCH)/Makefile
 431 export KBUILD_DEFCONFIG
 432
 433 config %config: scripts_basic outputmakefile FORCE
 434         $(Q)mkdir -p include/linux include/config
 435         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 436
 437 else
 438 # ===========================================================================
 439 # Build targets only - this includes vmlinux, arch specific targets, clean
 440 # targets and others. In general all targets except *config targets.
 441
 442 ifeq ($(KBUILD_EXTMOD),)
 443 # Additional helpers built in scripts/
 444 # Carefully list dependencies so we do not try to build scripts twice
 445 # in parallel
 446 PHONY += scripts
 447 scripts: scripts_basic include/config/auto.conf
 448         $(Q)$(MAKE) $(build)=$(@)
 449
 450 # Objects we will link into vmlinux / subdirs we need to visit
 451 init-y          := init/
 452 drivers-y       := drivers/ sound/
 453 net-y           := net/
 454 libs-y          := lib/
 455 core-y          := usr/
 456 endif # KBUILD_EXTMOD
 457
 458 ifeq ($(dot-config),1)
 459 # Read in config
 460 -include include/config/auto.conf
 461
 462 ifeq ($(KBUILD_EXTMOD),)
 463 # Read in dependencies to all Kconfig* files, make sure to run
 464 # oldconfig if changes are detected.
 465 -include include/config/auto.conf.cmd
 466
 467 # To avoid any implicit rule to kick in, define an empty command
 468 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 469
 470 # If .config is newer than include/config/auto.conf, someone tinkered
 471 # with it and forgot to run make oldconfig.
 472 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 473 # we execute the config step to be sure to catch updated Kconfig files
 474 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 475         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 476 else
 477 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 478 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 479 PHONY += include/config/auto.conf
 480
 481 include/config/auto.conf:
 482         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 483         echo;                                                           \
 484         echo "  ERROR: Kernel configuration is invalid.";               \
 485         echo "         include/linux/autoconf.h or $@ are missing.";    \
 486         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 487         echo;                                                           \
 488         /bin/false)
 489
 490 endif # KBUILD_EXTMOD
 491
 492 else
 493 # Dummy target needed, because used as prerequisite
 494 include/config/auto.conf: ;
 495 endif # $(dot-config)
 496
 497 # The all: target is the default when no target is given on the
 498 # command line.
 499 # This allow a user to issue only 'make' to build a kernel including modules
 500 # Defaults vmlinux but it is usually overridden in the arch makefile
 501 all: vmlinux
 502
 503 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 504 KBUILD_CFLAGS   += -Os
 505 else
 506 KBUILD_CFLAGS   += -O2
 507 endif
 508
 509 include $(srctree)/arch/$(SRCARCH)/Makefile
 510
 511 ifdef CONFIG_FRAME_POINTER
 512 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 513 else
 514 KBUILD_CFLAGS   += -fomit-frame-pointer
 515 endif
 516
 517 ifdef CONFIG_DEBUG_INFO
 518 KBUILD_CFLAGS   += -g
 519 KBUILD_AFLAGS   += -gdwarf-2
 520 endif
 521
 522 # Force gcc to behave correct even for buggy distributions
 523 KBUILD_CFLAGS         += $(call cc-option, -fno-stack-protector)
 524
 525 # arch Makefile may override CC so keep this after arch Makefile is included
 526 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 527 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 528
 529 # warn about C99 declaration after statement
 530 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 531
 532 # disable pointer signed / unsigned warnings in gcc 4.0
 533 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 534
 535 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 536 # But warn user when we do so
 537 warn-assign = \
 538 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 539
 540 ifneq ($(KCPPFLAGS),)
 541         $(call warn-assign,CPPFLAGS)
 542         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 543 endif
 544 ifneq ($(KAFLAGS),)
 545         $(call warn-assign,AFLAGS)
 546         KBUILD_AFLAGS += $(KAFLAGS)
 547 endif
 548 ifneq ($(KCFLAGS),)
 549         $(call warn-assign,CFLAGS)
 550         KBUILD_CFLAGS += $(KCFLAGS)
 551 endif
 552
 553 # Use --build-id when available.
 554 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 555                               $(call ld-option, -Wl$(comma)--build-id,))
 556 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 557 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 558
 559 # Default kernel image to build when no specific target is given.
 560 # KBUILD_IMAGE may be overruled on the command line or
 561 # set in the environment
 562 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 563 # this default value
 564 export KBUILD_IMAGE ?= vmlinux
 565
 566 #
 567 # INSTALL_PATH specifies where to place the updated kernel and system map
 568 # images. Default is /boot, but you can set it to other values
 569 export  INSTALL_PATH ?= /boot
 570
 571 #
 572 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 573 # relocations required by build roots.  This is not defined in the
 574 # makefile but the argument can be passed to make if needed.
 575 #
 576
 577 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 578 export MODLIB
 579
 580 #
 581 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 582 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 583 #  the default option --strip-debug will be used.  Otherwise,
 584 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 585
 586 ifdef INSTALL_MOD_STRIP
 587 ifeq ($(INSTALL_MOD_STRIP),1)
 588 mod_strip_cmd = $(STRIP) --strip-debug
 589 else
 590 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 591 endif # INSTALL_MOD_STRIP=1
 592 else
 593 mod_strip_cmd = true
 594 endif # INSTALL_MOD_STRIP
 595 export mod_strip_cmd
 596
 597
 598 ifeq ($(KBUILD_EXTMOD),)
 599 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 600
 601 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 602                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 603                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 604
 605 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 606                      $(init-n) $(init-) \
 607                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 608                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 609
 610 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 611 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 612 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 613 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 614 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 615 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 616 libs-y          := $(libs-y1) $(libs-y2)
 617
 618 # Build vmlinux
 619 # ---------------------------------------------------------------------------
 620 # vmlinux is built from the objects selected by $(vmlinux-init) and
 621 # $(vmlinux-main). Most are built-in.o files from top-level directories
 622 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 623 # Ordering when linking is important, and $(vmlinux-init) must be first.
 624 #
 625 # vmlinux
 626 #   ^
 627 #   |
 628 #   +-< $(vmlinux-init)
 629 #   |   +--< init/version.o + more
 630 #   |
 631 #   +--< $(vmlinux-main)
 632 #   |    +--< driver/built-in.o mm/built-in.o + more
 633 #   |
 634 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 635 #
 636 # vmlinux version (uname -v) cannot be updated during normal
 637 # descending-into-subdirs phase since we do not yet know if we need to
 638 # update vmlinux.
 639 # Therefore this step is delayed until just before final link of vmlinux -
 640 # except in the kallsyms case where it is done just before adding the
 641 # symbols to the kernel.
 642 #
 643 # System.map is generated to document addresses of all kernel symbols
 644
 645 vmlinux-init := $(head-y) $(init-y)
 646 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 647 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 648 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 649 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 650
 651 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 652 # May be overridden by arch/$(ARCH)/Makefile
 653 quiet_cmd_vmlinux__ ?= LD      $@
 654       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 655       -T $(vmlinux-lds) $(vmlinux-init)                          \
 656       --start-group $(vmlinux-main) --end-group                  \
 657       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 658
 659 # Generate new vmlinux version
 660 quiet_cmd_vmlinux_version = GEN     .version
 661       cmd_vmlinux_version = set -e;                     \
 662         if [ ! -r .version ]; then                      \
 663           rm -f .version;                               \
 664           echo 1 >.version;                             \
 665         else                                            \
 666           mv .version .old_version;                     \
 667           expr 0$$(cat .old_version) + 1 >.version;     \
 668         fi;                                             \
 669         $(MAKE) $(build)=init
 670
 671 # Generate System.map
 672 quiet_cmd_sysmap = SYSMAP
 673       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 674
 675 # Link of vmlinux
 676 # If CONFIG_KALLSYMS is set .version is already updated
 677 # Generate System.map and verify that the content is consistent
 678 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 679 # First command is ':' to allow us to use + in front of the rule
 680 define rule_vmlinux__
 681         :
 682         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 683
 684         $(call cmd,vmlinux__)
 685         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 686
 687         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 688           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 689         $(cmd_sysmap) $@ System.map;                                         \
 690         if [ $$? -ne 0 ]; then                                               \
 691                 rm -f $@;                                                    \
 692                 /bin/false;                                                  \
 693         fi;
 694         $(verify_kallsyms)
 695 endef
 696
 697
 698 ifdef CONFIG_KALLSYMS
 699 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 700 # It's a three stage process:
 701 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 702 #   empty
 703 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 704 #   the right size - vmlinux version (uname -v) is updated during this step
 705 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 706 #   but due to the added section, some addresses have shifted.
 707 #   From here, we generate a correct .tmp_kallsyms2.o
 708 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 709 # o Verify that the System.map from vmlinux matches the map from
 710 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 711 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 712 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 713 #   temporary bypass to allow the kernel to be built while the
 714 #   maintainers work out what went wrong with kallsyms.
 715
 716 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 717 last_kallsyms := 3
 718 else
 719 last_kallsyms := 2
 720 endif
 721
 722 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 723
 724 define verify_kallsyms
 725         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 726           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 727           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 728         $(Q)cmp -s System.map .tmp_System.map ||                             \
 729                 (echo Inconsistent kallsyms data;                            \
 730                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 731                  rm .tmp_kallsyms* ; /bin/false )
 732 endef
 733
 734 # Update vmlinux version before link
 735 # Use + in front of this rule to silent warning about make -j1
 736 # First command is ':' to allow us to use + in front of this rule
 737 cmd_ksym_ld = $(cmd_vmlinux__)
 738 define rule_ksym_ld
 739         :
 740         +$(call cmd,vmlinux_version)
 741         $(call cmd,vmlinux__)
 742         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 743 endef
 744
 745 # Generate .S file with all kernel symbols
 746 quiet_cmd_kallsyms = KSYM    $@
 747       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 748                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 749
 750 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 751         $(call if_changed_dep,as_o_S)
 752
 753 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 754         $(call cmd,kallsyms)
 755
 756 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 757 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 758         $(call if_changed_rule,ksym_ld)
 759
 760 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 761         $(call if_changed,vmlinux__)
 762
 763 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 764         $(call if_changed,vmlinux__)
 765
 766 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 767 $(KALLSYMS): scripts ;
 768
 769 # Generate some data for debugging strange kallsyms problems
 770 debug_kallsyms: .tmp_map$(last_kallsyms)
 771
 772 .tmp_map%: .tmp_vmlinux% FORCE
 773         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 774
 775 .tmp_map3: .tmp_map2
 776
 777 .tmp_map2: .tmp_map1
 778
 779 endif # ifdef CONFIG_KALLSYMS
 780
 781 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 782 # relevant sections renamed as per the linker script.
 783 quiet_cmd_vmlinux-modpost = LD      $@
 784       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 785          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 786          $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
 787 define rule_vmlinux-modpost
 788         :
 789         +$(call cmd,vmlinux-modpost)
 790         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 791         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 792 endef
 793
 794 # vmlinux image - including updated kernel symbols
 795 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
 796 ifdef CONFIG_HEADERS_CHECK
 797         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 798 endif
 799 ifdef CONFIG_SAMPLES
 800         $(Q)$(MAKE) $(build)=samples
 801 endif
 802         $(call vmlinux-modpost)
 803         $(call if_changed_rule,vmlinux__)
 804         $(Q)rm -f .old_version
 805
 806 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 807         $(call if_changed_rule,vmlinux-modpost)
 808
 809 # The actual objects are generated when descending,
 810 # make sure no implicit rule kicks in
 811 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 812
 813 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 814 # Preset locale variables to speed up the build process. Limit locale
 815 # tweaks to this spot to avoid wrong language settings when running
 816 # make menuconfig etc.
 817 # Error messages still appears in the original language
 818
 819 PHONY += $(vmlinux-dirs)
 820 $(vmlinux-dirs): prepare scripts
 821         $(Q)$(MAKE) $(build)=$@
 822
 823 # Build the kernel release string
 824 #
 825 # The KERNELRELEASE value built here is stored in the file
 826 # include/config/kernel.release, and is used when executing several
 827 # make targets, such as "make install" or "make modules_install."
 828 #
 829 # The eventual kernel release string consists of the following fields,
 830 # shown in a hierarchical format to show how smaller parts are concatenated
 831 # to form the larger and final value, with values coming from places like
 832 # the Makefile, kernel config options, make command line options and/or
 833 # SCM tag information.
 834 #
 835 #       $(KERNELVERSION)
 836 #         $(VERSION)                    eg, 2
 837 #         $(PATCHLEVEL)                 eg, 6
 838 #         $(SUBLEVEL)                   eg, 18
 839 #         $(EXTRAVERSION)               eg, -rc6
 840 #       $(localver-full)
 841 #         $(localver)
 842 #           localversion*               (files without backups, containing '~')
 843 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 844 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 845 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 846 #           $(LOCALVERSION)             (from make command line if provided)
 847 #
 848 #  Note how the final $(localver-auto) string is included *only* if the
 849 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 850 # moment, only git is supported but other SCMs can edit the script
 851 # scripts/setlocalversion and add the appropriate checks as needed.
 852
 853 pattern = ".*/localversion[^~]*"
 854 string  = $(shell cat /dev/null \
 855            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 856
 857 localver = $(subst $(space),, $(string) \
 858                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 859
 860 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 861 # and if the SCM is know a tag from the SCM is appended.
 862 # The appended tag is determined by the SCM used.
 863 #
 864 # Currently, only git is supported.
 865 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 866 # checks as needed.
 867 ifdef CONFIG_LOCALVERSION_AUTO
 868         _localver-auto = $(shell $(CONFIG_SHELL) \
 869                           $(srctree)/scripts/setlocalversion $(srctree))
 870         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 871 endif
 872
 873 localver-full = $(localver)$(localver-auto)
 874
 875 # Store (new) KERNELRELASE string in include/config/kernel.release
 876 kernelrelease = $(KERNELVERSION)$(localver-full)
 877 include/config/kernel.release: include/config/auto.conf FORCE
 878         $(Q)rm -f $@
 879         $(Q)echo $(kernelrelease) > $@
 880
 881
 882 # Things we need to do before we recursively start building the kernel
 883 # or the modules are listed in "prepare".
 884 # A multi level approach is used. prepareN is processed before prepareN-1.
 885 # archprepare is used in arch Makefiles and when processed asm symlink,
 886 # version.h and scripts_basic is processed / created.
 887
 888 # Listed in dependency order
 889 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 890
 891 # prepare3 is used to check if we are building in a separate output directory,
 892 # and if so do:
 893 # 1) Check that make has not been executed in the kernel src $(srctree)
 894 # 2) Create the include2 directory, used for the second asm symlink
 895 prepare3: include/config/kernel.release
 896 ifneq ($(KBUILD_SRC),)
 897         @echo '  Using $(srctree) as source for kernel'
 898         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 899                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 900                 echo "  in the '$(srctree)' directory.";\
 901                 /bin/false; \
 902         fi;
 903         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 904         $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 905 endif
 906
 907 # prepare2 creates a makefile if using a separate output directory
 908 prepare2: prepare3 outputmakefile
 909
 910 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 911                    include/asm include/config/auto.conf
 912         $(cmd_crmodverdir)
 913
 914 archprepare: prepare1 scripts_basic
 915
 916 prepare0: archprepare FORCE
 917         $(Q)$(MAKE) $(build)=.
 918         $(Q)$(MAKE) $(build)=. missing-syscalls
 919
 920 # All the preparing..
 921 prepare: prepare0
 922
 923 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 924 # done in arch/$(ARCH)/kernel/Makefile
 925
 926 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 927
 928 # The asm symlink changes when $(ARCH) changes.
 929 # Detect this and ask user to run make mrproper
 930
 931 include/asm: FORCE
 932         $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
 933         if [ -L include/asm ]; then                                     \
 934                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
 935                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 936                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 937                         exit 1;                                         \
 938                 fi;                                                     \
 939         else                                                            \
 940                 echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
 941                 if [ ! -d include ]; then                               \
 942                         mkdir -p include;                               \
 943                 fi;                                                     \
 944                 ln -fsn asm-$(SRCARCH) $@;                              \
 945         fi
 946
 947 # Generate some files
 948 # ---------------------------------------------------------------------------
 949
 950 # KERNELRELEASE can change from a few different places, meaning version.h
 951 # needs to be updated, so this check is forced on all builds
 952
 953 uts_len := 64
 954 define filechk_utsrelease.h
 955         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 956           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 957           exit 1;                                                         \
 958         fi;                                                               \
 959         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 960 endef
 961
 962 define filechk_version.h
 963         (echo \#define LINUX_VERSION_CODE $(shell                             \
 964         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 965         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 966 endef
 967
 968 include/linux/version.h: $(srctree)/Makefile FORCE
 969         $(call filechk,version.h)
 970
 971 include/linux/utsrelease.h: include/config/kernel.release FORCE
 972         $(call filechk,utsrelease.h)
 973
 974 # ---------------------------------------------------------------------------
 975
 976 PHONY += depend dep
 977 depend dep:
 978         @echo '*** Warning: make $@ is unnecessary now.'
 979
 980 # ---------------------------------------------------------------------------
 981 # Kernel headers
 982 INSTALL_HDR_PATH=$(objtree)/usr
 983 export INSTALL_HDR_PATH
 984
 985 HDRFILTER=generic i386 x86_64
 986 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
 987
 988 PHONY += headers_install_all
 989 headers_install_all: include/linux/version.h scripts_basic FORCE
 990         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 991         $(Q)for arch in $(HDRARCHES); do \
 992          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
 993          done
 994
 995 PHONY += headers_install
 996 headers_install: include/linux/version.h scripts_basic FORCE
 997         @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
 998           echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
 999           exit 1 ; fi
1000         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1001         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1002
1003 PHONY += headers_check_all
1004 headers_check_all: headers_install_all
1005         $(Q)for arch in $(HDRARCHES); do \
1006          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1007          done
1008
1009 PHONY += headers_check
1010 headers_check: headers_install
1011         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1012
1013 # ---------------------------------------------------------------------------
1014 # Modules
1015
1016 ifdef CONFIG_MODULES
1017
1018 # By default, build modules as well
1019
1020 all: modules
1021
1022 #       Build modules
1023
1024 PHONY += modules
1025 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1026         @echo '  Building modules, stage 2.';
1027         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1028
1029
1030 # Target to prepare building external modules
1031 PHONY += modules_prepare
1032 modules_prepare: prepare scripts
1033
1034 # Target to install modules
1035 PHONY += modules_install
1036 modules_install: _modinst_ _modinst_post
1037
1038 PHONY += _modinst_
1039 _modinst_:
1040         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1041                 echo "Warning: you may need to install module-init-tools"; \
1042                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1043                 sleep 1; \
1044         fi
1045         @rm -rf $(MODLIB)/kernel
1046         @rm -f $(MODLIB)/source
1047         @mkdir -p $(MODLIB)/kernel
1048         @ln -s $(srctree) $(MODLIB)/source
1049         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1050                 rm -f $(MODLIB)/build ; \
1051                 ln -s $(objtree) $(MODLIB)/build ; \
1052         fi
1053         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1054
1055 # This depmod is only for convenience to give the initial
1056 # boot a modules.dep even before / is mounted read-write.  However the
1057 # boot script depmod is the master version.
1058 PHONY += _modinst_post
1059 _modinst_post: _modinst_
1060         $(call cmd,depmod)
1061
1062 else # CONFIG_MODULES
1063
1064 # Modules not configured
1065 # ---------------------------------------------------------------------------
1066
1067 modules modules_install: FORCE
1068         @echo
1069         @echo "The present kernel configuration has modules disabled."
1070         @echo "Type 'make config' and enable loadable module support."
1071         @echo "Then build a kernel with module support enabled."
1072         @echo
1073         @exit 1
1074
1075 endif # CONFIG_MODULES
1076
1077 ###
1078 # Cleaning is done on three levels.
1079 # make clean     Delete most generated files
1080 #                Leave enough to build external modules
1081 # make mrproper  Delete the current configuration, and all generated files
1082 # make distclean Remove editor backup files, patch leftover files and the like
1083
1084 # Directories & files removed with 'make clean'
1085 CLEAN_DIRS  += $(MODVERDIR)
1086 CLEAN_FILES +=  vmlinux System.map \
1087                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1088
1089 # Directories & files removed with 'make mrproper'
1090 MRPROPER_DIRS  += include/config include2 usr/include
1091 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1092                   include/linux/autoconf.h include/linux/version.h      \
1093                   include/linux/utsrelease.h                            \
1094                   Module.symvers tags TAGS cscope*
1095
1096 # clean - Delete most, but leave enough to build external modules
1097 #
1098 clean: rm-dirs  := $(CLEAN_DIRS)
1099 clean: rm-files := $(CLEAN_FILES)
1100 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1101
1102 PHONY += $(clean-dirs) clean archclean
1103 $(clean-dirs):
1104         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1105
1106 clean: archclean $(clean-dirs)
1107         $(call cmd,rmdirs)
1108         $(call cmd,rmfiles)
1109         @find . $(RCS_FIND_IGNORE) \
1110                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1111                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1112                 -o -name '*.symtypes' \) \
1113                 -type f -print | xargs rm -f
1114
1115 # mrproper - Delete all generated files, including .config
1116 #
1117 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1118 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1119 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1120
1121 PHONY += $(mrproper-dirs) mrproper archmrproper
1122 $(mrproper-dirs):
1123         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1124
1125 mrproper: clean archmrproper $(mrproper-dirs)
1126         $(call cmd,rmdirs)
1127         $(call cmd,rmfiles)
1128
1129 # distclean
1130 #
1131 PHONY += distclean
1132
1133 distclean: mrproper
1134         @find $(srctree) $(RCS_FIND_IGNORE) \
1135                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1136                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1137                 -o -name '.*.rej' -o -size 0 \
1138                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1139                 -type f -print | xargs rm -f
1140
1141
1142 # Packaging of the kernel to various formats
1143 # ---------------------------------------------------------------------------
1144 # rpm target kept for backward compatibility
1145 package-dir     := $(srctree)/scripts/package
1146
1147 %pkg: include/config/kernel.release FORCE
1148         $(Q)$(MAKE) $(build)=$(package-dir) $@
1149 rpm: include/config/kernel.release FORCE
1150         $(Q)$(MAKE) $(build)=$(package-dir) $@
1151
1152
1153 # Brief documentation of the typical targets used
1154 # ---------------------------------------------------------------------------
1155
1156 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1157 boards := $(notdir $(boards))
1158
1159 help:
1160         @echo  'Cleaning targets:'
1161         @echo  '  clean           - Remove most generated files but keep the config and'
1162         @echo  '                    enough build support to build external modules'
1163         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1164         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1165         @echo  ''
1166         @echo  'Configuration targets:'
1167         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1168         @echo  ''
1169         @echo  'Other generic targets:'
1170         @echo  '  all             - Build all targets marked with [*]'
1171         @echo  '* vmlinux         - Build the bare kernel'
1172         @echo  '* modules         - Build all modules'
1173         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1174         @echo  '  dir/            - Build all files in dir and below'
1175         @echo  '  dir/file.[ois]  - Build specified target only'
1176         @echo  '  dir/file.ko     - Build module including final link'
1177         @echo  '  rpm             - Build a kernel as an RPM package'
1178         @echo  '  tags/TAGS       - Generate tags file for editors'
1179         @echo  '  cscope          - Generate cscope index'
1180         @echo  '  kernelrelease   - Output the release version string'
1181         @echo  '  kernelversion   - Output the version stored in Makefile'
1182         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1183          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1184          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1185          fi
1186         @echo  ''
1187         @echo  'Static analysers'
1188         @echo  '  checkstack      - Generate a list of stack hogs'
1189         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1190         @echo  '  export_report   - List the usages of all exported symbols'
1191         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1192          echo  '  headers_check   - Sanity check on exported headers'; \
1193          fi
1194         @echo  ''
1195         @echo  'Kernel packaging:'
1196         @$(MAKE) $(build)=$(package-dir) help
1197         @echo  ''
1198         @echo  'Documentation targets:'
1199         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1200         @echo  ''
1201         @echo  'Architecture specific targets ($(ARCH)):'
1202         @$(if $(archhelp),$(archhelp),\
1203                 echo '  No architecture specific help defined for $(ARCH)')
1204         @echo  ''
1205         @$(if $(boards), \
1206                 $(foreach b, $(boards), \
1207                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1208                 echo '')
1209
1210         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1211         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1212         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1213         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1214         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1215         @echo  ''
1216         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1217         @echo  'For further info see the ./README file'
1218
1219
1220 # Documentation targets
1221 # ---------------------------------------------------------------------------
1222 %docs: scripts_basic FORCE
1223         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1224
1225 else # KBUILD_EXTMOD
1226
1227 ###
1228 # External module support.
1229 # When building external modules the kernel used as basis is considered
1230 # read-only, and no consistency checks are made and the make
1231 # system is not used on the basis kernel. If updates are required
1232 # in the basis kernel ordinary make commands (without M=...) must
1233 # be used.
1234 #
1235 # The following are the only valid targets when building external
1236 # modules.
1237 # make M=dir clean     Delete all automatically generated files
1238 # make M=dir modules   Make all modules in specified dir
1239 # make M=dir           Same as 'make M=dir modules'
1240 # make M=dir modules_install
1241 #                      Install the modules built in the module directory
1242 #                      Assumes install directory is already created
1243
1244 # We are always building modules
1245 KBUILD_MODULES := 1
1246 PHONY += crmodverdir
1247 crmodverdir:
1248         $(cmd_crmodverdir)
1249
1250 PHONY += $(objtree)/Module.symvers
1251 $(objtree)/Module.symvers:
1252         @test -e $(objtree)/Module.symvers || ( \
1253         echo; \
1254         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1255         echo "           is missing; modules will have no dependencies and modversions."; \
1256         echo )
1257
1258 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1259 PHONY += $(module-dirs) modules
1260 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1261         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1262
1263 modules: $(module-dirs)
1264         @echo '  Building modules, stage 2.';
1265         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1266
1267 PHONY += modules_install
1268 modules_install: _emodinst_ _emodinst_post
1269
1270 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1271 PHONY += _emodinst_
1272 _emodinst_:
1273         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1274         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1275
1276 PHONY += _emodinst_post
1277 _emodinst_post: _emodinst_
1278         $(call cmd,depmod)
1279
1280 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1281
1282 PHONY += $(clean-dirs) clean
1283 $(clean-dirs):
1284         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1285
1286 clean:  rm-dirs := $(MODVERDIR)
1287 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1288 clean: $(clean-dirs)
1289         $(call cmd,rmdirs)
1290         $(call cmd,rmfiles)
1291         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1292                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1293                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1294                 -type f -print | xargs rm -f
1295
1296 help:
1297         @echo  '  Building external modules.'
1298         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1299         @echo  ''
1300         @echo  '  modules         - default target, build the module(s)'
1301         @echo  '  modules_install - install the module'
1302         @echo  '  clean           - remove generated files in module directory only'
1303         @echo  ''
1304
1305 # Dummies...
1306 PHONY += prepare scripts
1307 prepare: ;
1308 scripts: ;
1309 endif # KBUILD_EXTMOD
1310
1311 # Generate tags for editors
1312 # ---------------------------------------------------------------------------
1313
1314 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1315 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1316 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1317
1318 ifeq ($(src),$(obj))
1319 __srctree =
1320 else
1321 __srctree = $(srctree)/
1322 endif
1323
1324 ifeq ($(ALLSOURCE_ARCHS),)
1325 ifeq ($(ARCH),um)
1326 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1327 else
1328 ALLINCLUDE_ARCHS := $(SRCARCH)
1329 endif
1330 else
1331 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1332 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1333 endif
1334
1335 ALLSOURCE_ARCHS := $(SRCARCH)
1336
1337 define find-sources
1338         ( for arch in $(ALLSOURCE_ARCHS) ; do \
1339                find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1340                     -name $1 -print; \
1341           done ; \
1342           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1343                -name $1 -print; \
1344           find $(__srctree)include $(RCS_FIND_IGNORE) \
1345                \( -name config -o -name 'asm-*' \) -prune \
1346                -o -name $1 -print; \
1347           for arch in $(ALLINCLUDE_ARCHS) ; do \
1348                find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1349                     -name $1 -print; \
1350           done ; \
1351           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1352                -name $1 -print; \
1353           find $(__srctree) $(RCS_FIND_IGNORE) \
1354                \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1355                -name $1 -print; \
1356           )
1357 endef
1358
1359 define all-sources
1360         $(call find-sources,'*.[chS]')
1361 endef
1362 define all-kconfigs
1363         $(call find-sources,'Kconfig*')
1364 endef
1365 define all-defconfigs
1366         $(call find-sources,'defconfig')
1367 endef
1368
1369 define xtags
1370         if $1 --version 2>&1 | grep -iq exuberant; then \
1371             $(all-sources) | xargs $1 -a \
1372                 -I __initdata,__exitdata,__acquires,__releases \
1373                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1374                 --extra=+f --c-kinds=+px \
1375                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1376             $(all-kconfigs) | xargs $1 -a \
1377                 --langdef=kconfig \
1378                 --language-force=kconfig \
1379                 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1380             $(all-defconfigs) | xargs -r $1 -a \
1381                 --langdef=dotconfig \
1382                 --language-force=dotconfig \
1383                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1384         elif $1 --version 2>&1 | grep -iq emacs; then \
1385             $(all-sources) | xargs $1 -a; \
1386             $(all-kconfigs) | xargs $1 -a \
1387                 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1388             $(all-defconfigs) | xargs -r $1 -a \
1389                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1390         else \
1391             $(all-sources) | xargs $1 -a; \
1392         fi
1393 endef
1394
1395 quiet_cmd_cscope-file = FILELST cscope.files
1396       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1397
1398 quiet_cmd_cscope = MAKE    cscope.out
1399       cmd_cscope = cscope -b
1400
1401 cscope: FORCE
1402         $(call cmd,cscope-file)
1403         $(call cmd,cscope)
1404
1405 quiet_cmd_TAGS = MAKE   $@
1406 define cmd_TAGS
1407         rm -f $@; \
1408         $(call xtags,etags)
1409 endef
1410
1411 TAGS: FORCE
1412         $(call cmd,TAGS)
1413
1414 quiet_cmd_tags = MAKE   $@
1415 define cmd_tags
1416         rm -f $@; \
1417         $(call xtags,ctags)
1418 endef
1419
1420 tags: FORCE
1421         $(call cmd,tags)
1422
1423
1424 # Scripts to check various things for consistency
1425 # ---------------------------------------------------------------------------
1426
1427 includecheck:
1428         find * $(RCS_FIND_IGNORE) \
1429                 -name '*.[hcS]' -type f -print | sort \
1430                 | xargs $(PERL) -w scripts/checkincludes.pl
1431
1432 versioncheck:
1433         find * $(RCS_FIND_IGNORE) \
1434                 -name '*.[hcS]' -type f -print | sort \
1435                 | xargs $(PERL) -w scripts/checkversion.pl
1436
1437 namespacecheck:
1438         $(PERL) $(srctree)/scripts/namespace.pl
1439
1440 export_report:
1441         $(PERL) $(srctree)/scripts/export_report.pl
1442
1443 endif #ifeq ($(config-targets),1)
1444 endif #ifeq ($(mixed-targets),1)
1445
1446 PHONY += checkstack kernelrelease kernelversion
1447
1448 # UML needs a little special treatment here.  It wants to use the host
1449 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1450 # else wants $(ARCH), including people doing cross-builds, which means
1451 # that $(SUBARCH) doesn't work here.
1452 ifeq ($(ARCH), um)
1453 CHECKSTACK_ARCH := $(SUBARCH)
1454 else
1455 CHECKSTACK_ARCH := $(ARCH)
1456 endif
1457 checkstack:
1458         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1459         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1460
1461 kernelrelease:
1462         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1463         $(error kernelrelease not valid - run 'make prepare' to update it))
1464 kernelversion:
1465         @echo $(KERNELVERSION)
1466
1467 # Single targets
1468 # ---------------------------------------------------------------------------
1469 # Single targets are compatible with:
1470 # - build whith mixed source and output
1471 # - build with separate output dir 'make O=...'
1472 # - external modules
1473 #
1474 #  target-dir => where to store outputfile
1475 #  build-dir  => directory in kernel source tree to use
1476
1477 ifeq ($(KBUILD_EXTMOD),)
1478         build-dir  = $(patsubst %/,%,$(dir $@))
1479         target-dir = $(dir $@)
1480 else
1481         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1482         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1483         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1484 endif
1485
1486 %.s: %.c prepare scripts FORCE
1487         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1488 %.i: %.c prepare scripts FORCE
1489         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1490 %.o: %.c prepare scripts FORCE
1491         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1492 %.lst: %.c prepare scripts FORCE
1493         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1494 %.s: %.S prepare scripts FORCE
1495         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1496 %.o: %.S prepare scripts FORCE
1497         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1498 %.symtypes: %.c prepare scripts FORCE
1499         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1500
1501 # Modules
1502 / %/: prepare scripts FORCE
1503         $(cmd_crmodverdir)
1504         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1505         $(build)=$(build-dir)
1506 %.ko: prepare scripts FORCE
1507         $(cmd_crmodverdir)
1508         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1509         $(build)=$(build-dir) $(@:.ko=.o)
1510         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1511
1512 # FIXME Should go into a make.lib or something
1513 # ===========================================================================
1514
1515 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1516       cmd_rmdirs = rm -rf $(rm-dirs)
1517
1518 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1519       cmd_rmfiles = rm -f $(rm-files)
1520
1521 # Run depmod only is we have System.map and depmod is executable
1522 # and we build for the host arch
1523 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1524       cmd_depmod = \
1525         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1526                 $(DEPMOD) -ae -F System.map                                     \
1527                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1528                 $(KERNELRELEASE);                                               \
1529         fi
1530
1531 # Create temporary dir for module support files
1532 # clean it up only when building all modules
1533 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1534                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1535
1536 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1537           $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1538           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1539
1540 quiet_cmd_as_o_S = AS      $@
1541 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1542
1543 # read all saved command lines
1544
1545 targets := $(wildcard $(sort $(targets)))
1546 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1547
1548 ifneq ($(cmd_files),)
1549   $(cmd_files): ;       # Do not try to update included dependency files
1550   include $(cmd_files)
1551 endif
1552
1553 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1554 # Usage:
1555 # $(Q)$(MAKE) $(clean)=dir
1556 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1557
1558 endif   # skip-makefile
1559
1560 PHONY += FORCE
1561 FORCE:
1562
1563 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1564 Makefile: ;
1565
1566 # Declare the contents of the .PHONY variable as phony.  We keep that
1567 # information in a variable se we can use it in if_changed and friends.
1568 .PHONY: $(PHONY)