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         K64BIT  := n
 204 endif
 205 ifeq ($(ARCH),x86_64)
 206         SRCARCH := x86
 207         K64BIT  := y
 208 endif
 209
 210 KCONFIG_CONFIG  ?= .config
 211
 212 # SHELL used by kbuild
 213 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 214           else if [ -x /bin/bash ]; then echo /bin/bash; \
 215           else echo sh; fi ; fi)
 216
 217 HOSTCC       = gcc
 218 HOSTCXX      = g++
 219 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 220 HOSTCXXFLAGS = -O2
 221
 222 # Decide whether to build built-in, modular, or both.
 223 # Normally, just do built-in.
 224
 225 KBUILD_MODULES :=
 226 KBUILD_BUILTIN := 1
 227
 228 #       If we have only "make modules", don't compile built-in objects.
 229 #       When we're building modules with modversions, we need to consider
 230 #       the built-in objects during the descend as well, in order to
 231 #       make sure the checksums are up to date before we record them.
 232
 233 ifeq ($(MAKECMDGOALS),modules)
 234   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 235 endif
 236
 237 #       If we have "make <whatever> modules", compile modules
 238 #       in addition to whatever we do anyway.
 239 #       Just "make" or "make all" shall build modules as well
 240
 241 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 242   KBUILD_MODULES := 1
 243 endif
 244
 245 ifeq ($(MAKECMDGOALS),)
 246   KBUILD_MODULES := 1
 247 endif
 248
 249 export KBUILD_MODULES KBUILD_BUILTIN
 250 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 251
 252 # Beautify output
 253 # ---------------------------------------------------------------------------
 254 #
 255 # Normally, we echo the whole command before executing it. By making
 256 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 257 # $(quiet) to choose other forms of output instead, e.g.
 258 #
 259 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 260 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 261 #
 262 # If $(quiet) is empty, the whole command will be printed.
 263 # If it is set to "quiet_", only the short version will be printed.
 264 # If it is set to "silent_", nothing will be printed at all, since
 265 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 266 #
 267 # A simple variant is to prefix commands with $(Q) - that's useful
 268 # for commands that shall be hidden in non-verbose mode.
 269 #
 270 #       $(Q)ln $@ :<
 271 #
 272 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 273 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 274
 275 ifeq ($(KBUILD_VERBOSE),1)
 276   quiet =
 277   Q =
 278 else
 279   quiet=quiet_
 280   Q = @
 281 endif
 282
 283 # If the user is running make -s (silent mode), suppress echoing of
 284 # commands
 285
 286 ifneq ($(findstring s,$(MAKEFLAGS)),)
 287   quiet=silent_
 288 endif
 289
 290 export quiet Q KBUILD_VERBOSE
 291
 292
 293 # Look for make include files relative to root of kernel src
 294 MAKEFLAGS += --include-dir=$(srctree)
 295
 296 # We need some generic definitions.
 297 include $(srctree)/scripts/Kbuild.include
 298
 299 # Make variables (CC, etc...)
 300
 301 AS              = $(CROSS_COMPILE)as
 302 LD              = $(CROSS_COMPILE)ld
 303 CC              = $(CROSS_COMPILE)gcc
 304 CPP             = $(CC) -E
 305 AR              = $(CROSS_COMPILE)ar
 306 NM              = $(CROSS_COMPILE)nm
 307 STRIP           = $(CROSS_COMPILE)strip
 308 OBJCOPY         = $(CROSS_COMPILE)objcopy
 309 OBJDUMP         = $(CROSS_COMPILE)objdump
 310 AWK             = awk
 311 GENKSYMS        = scripts/genksyms/genksyms
 312 DEPMOD          = /sbin/depmod
 313 KALLSYMS        = scripts/kallsyms
 314 PERL            = perl
 315 CHECK           = sparse
 316
 317 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 318 MODFLAGS        = -DMODULE
 319 CFLAGS_MODULE   = $(MODFLAGS)
 320 AFLAGS_MODULE   = $(MODFLAGS)
 321 LDFLAGS_MODULE  =
 322 CFLAGS_KERNEL   =
 323 AFLAGS_KERNEL   =
 324
 325
 326 # Use LINUXINCLUDE when you must reference the include/ directory.
 327 # Needed to be compatible with the O= option
 328 LINUXINCLUDE    := -Iinclude \
 329                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 330                    -include include/linux/autoconf.h
 331
 332 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 333
 334 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 335                    -fno-strict-aliasing -fno-common \
 336                    -Werror-implicit-function-declaration
 337 KBUILD_AFLAGS   := -D__ASSEMBLY__
 338
 339 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 340 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 341 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 342
 343 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 344 export ARCH SRCARCH K64BIT CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 345 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 346 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 347
 348 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 349 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 350 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 351
 352 # When compiling out-of-tree modules, put MODVERDIR in the module
 353 # tree rather than in the kernel tree. The kernel tree might
 354 # even be read-only.
 355 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 356
 357 # Files to ignore in find ... statements
 358
 359 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
 360 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 361
 362 # ===========================================================================
 363 # Rules shared between *config targets and build targets
 364
 365 # Basic helpers built in scripts/
 366 PHONY += scripts_basic
 367 scripts_basic:
 368         $(Q)$(MAKE) $(build)=scripts/basic
 369
 370 # To avoid any implicit rule to kick in, define an empty command.
 371 scripts/basic/%: scripts_basic ;
 372
 373 PHONY += outputmakefile
 374 # outputmakefile generates a Makefile in the output directory, if using a
 375 # separate output directory. This allows convenient use of make in the
 376 # output directory.
 377 outputmakefile:
 378 ifneq ($(KBUILD_SRC),)
 379         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 380             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 381 endif
 382
 383 # To make sure we do not include .config for any of the *config targets
 384 # catch them early, and hand them over to scripts/kconfig/Makefile
 385 # It is allowed to specify more targets when calling make, including
 386 # mixing *config targets and build targets.
 387 # For example 'make oldconfig all'.
 388 # Detect when mixed targets is specified, and make a second invocation
 389 # of make so .config is not included in this case either (for *config).
 390
 391 no-dot-config-targets := clean mrproper distclean \
 392                          cscope TAGS tags help %docs check% \
 393                          include/linux/version.h headers_% \
 394                          kernelrelease kernelversion
 395
 396 config-targets := 0
 397 mixed-targets  := 0
 398 dot-config     := 1
 399
 400 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 401         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 402                 dot-config := 0
 403         endif
 404 endif
 405
 406 ifeq ($(KBUILD_EXTMOD),)
 407         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 408                 config-targets := 1
 409                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 410                         mixed-targets := 1
 411                 endif
 412         endif
 413 endif
 414
 415 ifeq ($(mixed-targets),1)
 416 # ===========================================================================
 417 # We're called with mixed targets (*config and build targets).
 418 # Handle them one by one.
 419
 420 %:: FORCE
 421         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 422
 423 else
 424 ifeq ($(config-targets),1)
 425 # ===========================================================================
 426 # *config targets only - make sure prerequisites are updated, and descend
 427 # in scripts/kconfig to make the *config target
 428
 429 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 430 # KBUILD_DEFCONFIG may point out an alternative default configuration
 431 # used for 'make defconfig'
 432 include $(srctree)/arch/$(SRCARCH)/Makefile
 433 export KBUILD_DEFCONFIG
 434
 435 config %config: scripts_basic outputmakefile FORCE
 436         $(Q)mkdir -p include/linux include/config
 437         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 438
 439 else
 440 # ===========================================================================
 441 # Build targets only - this includes vmlinux, arch specific targets, clean
 442 # targets and others. In general all targets except *config targets.
 443
 444 ifeq ($(KBUILD_EXTMOD),)
 445 # Additional helpers built in scripts/
 446 # Carefully list dependencies so we do not try to build scripts twice
 447 # in parallel
 448 PHONY += scripts
 449 scripts: scripts_basic include/config/auto.conf
 450         $(Q)$(MAKE) $(build)=$(@)
 451
 452 # Objects we will link into vmlinux / subdirs we need to visit
 453 init-y          := init/
 454 drivers-y       := drivers/ sound/
 455 net-y           := net/
 456 libs-y          := lib/
 457 core-y          := usr/
 458 endif # KBUILD_EXTMOD
 459
 460 ifeq ($(dot-config),1)
 461 # Read in config
 462 -include include/config/auto.conf
 463
 464 ifeq ($(KBUILD_EXTMOD),)
 465 # Read in dependencies to all Kconfig* files, make sure to run
 466 # oldconfig if changes are detected.
 467 -include include/config/auto.conf.cmd
 468
 469 # To avoid any implicit rule to kick in, define an empty command
 470 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 471
 472 # If .config is newer than include/config/auto.conf, someone tinkered
 473 # with it and forgot to run make oldconfig.
 474 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 475 # we execute the config step to be sure to catch updated Kconfig files
 476 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 477         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 478 else
 479 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 480 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 481 PHONY += include/config/auto.conf
 482
 483 include/config/auto.conf:
 484         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 485         echo;                                                           \
 486         echo "  ERROR: Kernel configuration is invalid.";               \
 487         echo "         include/linux/autoconf.h or $@ are missing.";    \
 488         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 489         echo;                                                           \
 490         /bin/false)
 491
 492 endif # KBUILD_EXTMOD
 493
 494 else
 495 # Dummy target needed, because used as prerequisite
 496 include/config/auto.conf: ;
 497 endif # $(dot-config)
 498
 499 # The all: target is the default when no target is given on the
 500 # command line.
 501 # This allow a user to issue only 'make' to build a kernel including modules
 502 # Defaults vmlinux but it is usually overridden in the arch makefile
 503 all: vmlinux
 504
 505 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 506 KBUILD_CFLAGS   += -Os
 507 else
 508 KBUILD_CFLAGS   += -O2
 509 endif
 510
 511 include $(srctree)/arch/$(SRCARCH)/Makefile
 512
 513 ifdef CONFIG_FRAME_POINTER
 514 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 515 else
 516 KBUILD_CFLAGS   += -fomit-frame-pointer
 517 endif
 518
 519 ifdef CONFIG_DEBUG_INFO
 520 KBUILD_CFLAGS   += -g
 521 KBUILD_AFLAGS   += -gdwarf-2
 522 endif
 523
 524 # Force gcc to behave correct even for buggy distributions
 525 KBUILD_CFLAGS         += $(call cc-option, -fno-stack-protector)
 526
 527 # arch Makefile may override CC so keep this after arch Makefile is included
 528 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 529 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 530
 531 # warn about C99 declaration after statement
 532 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 533
 534 # disable pointer signed / unsigned warnings in gcc 4.0
 535 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 536
 537 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 538 # But warn user when we do so
 539 warn-assign = \
 540 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 541
 542 ifneq ($(KCPPFLAGS),)
 543         $(call warn-assign,CPPFLAGS)
 544         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 545 endif
 546 ifneq ($(KAFLAGS),)
 547         $(call warn-assign,AFLAGS)
 548         KBUILD_AFLAGS += $(KAFLAGS)
 549 endif
 550 ifneq ($(KCFLAGS),)
 551         $(call warn-assign,CFLAGS)
 552         KBUILD_CFLAGS += $(KCFLAGS)
 553 endif
 554
 555 # Use --build-id when available.
 556 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 557                               $(call ld-option, -Wl$(comma)--build-id,))
 558 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 559 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 560
 561 # Default kernel image to build when no specific target is given.
 562 # KBUILD_IMAGE may be overruled on the command line or
 563 # set in the environment
 564 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 565 # this default value
 566 export KBUILD_IMAGE ?= vmlinux
 567
 568 #
 569 # INSTALL_PATH specifies where to place the updated kernel and system map
 570 # images. Default is /boot, but you can set it to other values
 571 export  INSTALL_PATH ?= /boot
 572
 573 #
 574 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 575 # relocations required by build roots.  This is not defined in the
 576 # makefile but the argument can be passed to make if needed.
 577 #
 578
 579 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 580 export MODLIB
 581
 582 #
 583 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 584 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 585 #  the default option --strip-debug will be used.  Otherwise,
 586 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 587
 588 ifdef INSTALL_MOD_STRIP
 589 ifeq ($(INSTALL_MOD_STRIP),1)
 590 mod_strip_cmd = $(STRIP) --strip-debug
 591 else
 592 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 593 endif # INSTALL_MOD_STRIP=1
 594 else
 595 mod_strip_cmd = true
 596 endif # INSTALL_MOD_STRIP
 597 export mod_strip_cmd
 598
 599
 600 ifeq ($(KBUILD_EXTMOD),)
 601 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 602
 603 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 604                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 605                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 606
 607 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 608                      $(init-n) $(init-) \
 609                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 610                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 611
 612 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 613 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 614 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 615 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 616 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 617 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 618 libs-y          := $(libs-y1) $(libs-y2)
 619
 620 # Build vmlinux
 621 # ---------------------------------------------------------------------------
 622 # vmlinux is built from the objects selected by $(vmlinux-init) and
 623 # $(vmlinux-main). Most are built-in.o files from top-level directories
 624 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 625 # Ordering when linking is important, and $(vmlinux-init) must be first.
 626 #
 627 # vmlinux
 628 #   ^
 629 #   |
 630 #   +-< $(vmlinux-init)
 631 #   |   +--< init/version.o + more
 632 #   |
 633 #   +--< $(vmlinux-main)
 634 #   |    +--< driver/built-in.o mm/built-in.o + more
 635 #   |
 636 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 637 #
 638 # vmlinux version (uname -v) cannot be updated during normal
 639 # descending-into-subdirs phase since we do not yet know if we need to
 640 # update vmlinux.
 641 # Therefore this step is delayed until just before final link of vmlinux -
 642 # except in the kallsyms case where it is done just before adding the
 643 # symbols to the kernel.
 644 #
 645 # System.map is generated to document addresses of all kernel symbols
 646
 647 vmlinux-init := $(head-y) $(init-y)
 648 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 649 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 650 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 651 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 652
 653 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 654 # May be overridden by arch/$(ARCH)/Makefile
 655 quiet_cmd_vmlinux__ ?= LD      $@
 656       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 657       -T $(vmlinux-lds) $(vmlinux-init)                          \
 658       --start-group $(vmlinux-main) --end-group                  \
 659       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 660
 661 # Generate new vmlinux version
 662 quiet_cmd_vmlinux_version = GEN     .version
 663       cmd_vmlinux_version = set -e;                     \
 664         if [ ! -r .version ]; then                      \
 665           rm -f .version;                               \
 666           echo 1 >.version;                             \
 667         else                                            \
 668           mv .version .old_version;                     \
 669           expr 0$$(cat .old_version) + 1 >.version;     \
 670         fi;                                             \
 671         $(MAKE) $(build)=init
 672
 673 # Generate System.map
 674 quiet_cmd_sysmap = SYSMAP
 675       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 676
 677 # Link of vmlinux
 678 # If CONFIG_KALLSYMS is set .version is already updated
 679 # Generate System.map and verify that the content is consistent
 680 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 681 # First command is ':' to allow us to use + in front of the rule
 682 define rule_vmlinux__
 683         :
 684         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 685
 686         $(call cmd,vmlinux__)
 687         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 688
 689         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 690           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 691         $(cmd_sysmap) $@ System.map;                                         \
 692         if [ $$? -ne 0 ]; then                                               \
 693                 rm -f $@;                                                    \
 694                 /bin/false;                                                  \
 695         fi;
 696         $(verify_kallsyms)
 697 endef
 698
 699
 700 ifdef CONFIG_KALLSYMS
 701 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 702 # It's a three stage process:
 703 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 704 #   empty
 705 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 706 #   the right size - vmlinux version (uname -v) is updated during this step
 707 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 708 #   but due to the added section, some addresses have shifted.
 709 #   From here, we generate a correct .tmp_kallsyms2.o
 710 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 711 # o Verify that the System.map from vmlinux matches the map from
 712 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 713 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 714 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 715 #   temporary bypass to allow the kernel to be built while the
 716 #   maintainers work out what went wrong with kallsyms.
 717
 718 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 719 last_kallsyms := 3
 720 else
 721 last_kallsyms := 2
 722 endif
 723
 724 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 725
 726 define verify_kallsyms
 727         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 728           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 729           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 730         $(Q)cmp -s System.map .tmp_System.map ||                             \
 731                 (echo Inconsistent kallsyms data;                            \
 732                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 733                  rm .tmp_kallsyms* ; /bin/false )
 734 endef
 735
 736 # Update vmlinux version before link
 737 # Use + in front of this rule to silent warning about make -j1
 738 # First command is ':' to allow us to use + in front of this rule
 739 cmd_ksym_ld = $(cmd_vmlinux__)
 740 define rule_ksym_ld
 741         :
 742         +$(call cmd,vmlinux_version)
 743         $(call cmd,vmlinux__)
 744         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 745 endef
 746
 747 # Generate .S file with all kernel symbols
 748 quiet_cmd_kallsyms = KSYM    $@
 749       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 750                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 751
 752 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 753         $(call if_changed_dep,as_o_S)
 754
 755 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 756         $(call cmd,kallsyms)
 757
 758 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 759 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 760         $(call if_changed_rule,ksym_ld)
 761
 762 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 763         $(call if_changed,vmlinux__)
 764
 765 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 766         $(call if_changed,vmlinux__)
 767
 768 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 769 $(KALLSYMS): scripts ;
 770
 771 # Generate some data for debugging strange kallsyms problems
 772 debug_kallsyms: .tmp_map$(last_kallsyms)
 773
 774 .tmp_map%: .tmp_vmlinux% FORCE
 775         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 776
 777 .tmp_map3: .tmp_map2
 778
 779 .tmp_map2: .tmp_map1
 780
 781 endif # ifdef CONFIG_KALLSYMS
 782
 783 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 784 # relevant sections renamed as per the linker script.
 785 quiet_cmd_vmlinux-modpost = LD      $@
 786       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 787          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 788          $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
 789 define rule_vmlinux-modpost
 790         :
 791         +$(call cmd,vmlinux-modpost)
 792         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 793         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 794 endef
 795
 796 # vmlinux image - including updated kernel symbols
 797 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
 798 ifdef CONFIG_HEADERS_CHECK
 799         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 800 endif
 801 ifdef CONFIG_SAMPLES
 802         $(Q)$(MAKE) $(build)=samples
 803 endif
 804         $(call vmlinux-modpost)
 805         $(call if_changed_rule,vmlinux__)
 806         $(Q)rm -f .old_version
 807
 808 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 809         $(call if_changed_rule,vmlinux-modpost)
 810
 811 # The actual objects are generated when descending,
 812 # make sure no implicit rule kicks in
 813 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 814
 815 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 816 # Preset locale variables to speed up the build process. Limit locale
 817 # tweaks to this spot to avoid wrong language settings when running
 818 # make menuconfig etc.
 819 # Error messages still appears in the original language
 820
 821 PHONY += $(vmlinux-dirs)
 822 $(vmlinux-dirs): prepare scripts
 823         $(Q)$(MAKE) $(build)=$@
 824
 825 # Build the kernel release string
 826 #
 827 # The KERNELRELEASE value built here is stored in the file
 828 # include/config/kernel.release, and is used when executing several
 829 # make targets, such as "make install" or "make modules_install."
 830 #
 831 # The eventual kernel release string consists of the following fields,
 832 # shown in a hierarchical format to show how smaller parts are concatenated
 833 # to form the larger and final value, with values coming from places like
 834 # the Makefile, kernel config options, make command line options and/or
 835 # SCM tag information.
 836 #
 837 #       $(KERNELVERSION)
 838 #         $(VERSION)                    eg, 2
 839 #         $(PATCHLEVEL)                 eg, 6
 840 #         $(SUBLEVEL)                   eg, 18
 841 #         $(EXTRAVERSION)               eg, -rc6
 842 #       $(localver-full)
 843 #         $(localver)
 844 #           localversion*               (files without backups, containing '~')
 845 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 846 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 847 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 848 #           $(LOCALVERSION)             (from make command line if provided)
 849 #
 850 #  Note how the final $(localver-auto) string is included *only* if the
 851 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 852 # moment, only git is supported but other SCMs can edit the script
 853 # scripts/setlocalversion and add the appropriate checks as needed.
 854
 855 pattern = ".*/localversion[^~]*"
 856 string  = $(shell cat /dev/null \
 857            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 858
 859 localver = $(subst $(space),, $(string) \
 860                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 861
 862 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 863 # and if the SCM is know a tag from the SCM is appended.
 864 # The appended tag is determined by the SCM used.
 865 #
 866 # Currently, only git is supported.
 867 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 868 # checks as needed.
 869 ifdef CONFIG_LOCALVERSION_AUTO
 870         _localver-auto = $(shell $(CONFIG_SHELL) \
 871                           $(srctree)/scripts/setlocalversion $(srctree))
 872         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 873 endif
 874
 875 localver-full = $(localver)$(localver-auto)
 876
 877 # Store (new) KERNELRELASE string in include/config/kernel.release
 878 kernelrelease = $(KERNELVERSION)$(localver-full)
 879 include/config/kernel.release: include/config/auto.conf FORCE
 880         $(Q)rm -f $@
 881         $(Q)echo $(kernelrelease) > $@
 882
 883
 884 # Things we need to do before we recursively start building the kernel
 885 # or the modules are listed in "prepare".
 886 # A multi level approach is used. prepareN is processed before prepareN-1.
 887 # archprepare is used in arch Makefiles and when processed asm symlink,
 888 # version.h and scripts_basic is processed / created.
 889
 890 # Listed in dependency order
 891 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 892
 893 # prepare3 is used to check if we are building in a separate output directory,
 894 # and if so do:
 895 # 1) Check that make has not been executed in the kernel src $(srctree)
 896 # 2) Create the include2 directory, used for the second asm symlink
 897 prepare3: include/config/kernel.release
 898 ifneq ($(KBUILD_SRC),)
 899         @echo '  Using $(srctree) as source for kernel'
 900         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 901                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 902                 echo "  in the '$(srctree)' directory.";\
 903                 /bin/false; \
 904         fi;
 905         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 906         $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 907 endif
 908
 909 # prepare2 creates a makefile if using a separate output directory
 910 prepare2: prepare3 outputmakefile
 911
 912 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 913                    include/asm include/config/auto.conf
 914         $(cmd_crmodverdir)
 915
 916 archprepare: prepare1 scripts_basic
 917
 918 prepare0: archprepare FORCE
 919         $(Q)$(MAKE) $(build)=.
 920         $(Q)$(MAKE) $(build)=. missing-syscalls
 921
 922 # All the preparing..
 923 prepare: prepare0
 924
 925 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 926 # done in arch/$(ARCH)/kernel/Makefile
 927
 928 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 929
 930 # The asm symlink changes when $(ARCH) changes.
 931 # Detect this and ask user to run make mrproper
 932
 933 include/asm: FORCE
 934         $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
 935         if [ -L include/asm ]; then                                     \
 936                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
 937                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 938                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 939                         exit 1;                                         \
 940                 fi;                                                     \
 941         else                                                            \
 942                 echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
 943                 if [ ! -d include ]; then                               \
 944                         mkdir -p include;                               \
 945                 fi;                                                     \
 946                 ln -fsn asm-$(SRCARCH) $@;                              \
 947         fi
 948
 949 # Generate some files
 950 # ---------------------------------------------------------------------------
 951
 952 # KERNELRELEASE can change from a few different places, meaning version.h
 953 # needs to be updated, so this check is forced on all builds
 954
 955 uts_len := 64
 956 define filechk_utsrelease.h
 957         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 958           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 959           exit 1;                                                         \
 960         fi;                                                               \
 961         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 962 endef
 963
 964 define filechk_version.h
 965         (echo \#define LINUX_VERSION_CODE $(shell                             \
 966         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 967         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 968 endef
 969
 970 include/linux/version.h: $(srctree)/Makefile FORCE
 971         $(call filechk,version.h)
 972
 973 include/linux/utsrelease.h: include/config/kernel.release FORCE
 974         $(call filechk,utsrelease.h)
 975
 976 # ---------------------------------------------------------------------------
 977
 978 PHONY += depend dep
 979 depend dep:
 980         @echo '*** Warning: make $@ is unnecessary now.'
 981
 982 # ---------------------------------------------------------------------------
 983 # Kernel headers
 984 INSTALL_HDR_PATH=$(objtree)/usr
 985 export INSTALL_HDR_PATH
 986
 987 HDRFILTER=generic i386 x86_64
 988 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
 989
 990 PHONY += headers_install_all
 991 headers_install_all: include/linux/version.h scripts_basic FORCE
 992         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 993         $(Q)for arch in $(HDRARCHES); do \
 994          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
 995          done
 996
 997 PHONY += headers_install
 998 headers_install: include/linux/version.h scripts_basic FORCE
 999         @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1000           echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1001           exit 1 ; fi
1002         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1003         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1004
1005 PHONY += headers_check_all
1006 headers_check_all: headers_install_all
1007         $(Q)for arch in $(HDRARCHES); do \
1008          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1009          done
1010
1011 PHONY += headers_check
1012 headers_check: headers_install
1013         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1014
1015 # ---------------------------------------------------------------------------
1016 # Modules
1017
1018 ifdef CONFIG_MODULES
1019
1020 # By default, build modules as well
1021
1022 all: modules
1023
1024 #       Build modules
1025
1026 PHONY += modules
1027 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1028         @echo '  Building modules, stage 2.';
1029         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1030
1031
1032 # Target to prepare building external modules
1033 PHONY += modules_prepare
1034 modules_prepare: prepare scripts
1035
1036 # Target to install modules
1037 PHONY += modules_install
1038 modules_install: _modinst_ _modinst_post
1039
1040 PHONY += _modinst_
1041 _modinst_:
1042         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1043                 echo "Warning: you may need to install module-init-tools"; \
1044                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1045                 sleep 1; \
1046         fi
1047         @rm -rf $(MODLIB)/kernel
1048         @rm -f $(MODLIB)/source
1049         @mkdir -p $(MODLIB)/kernel
1050         @ln -s $(srctree) $(MODLIB)/source
1051         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1052                 rm -f $(MODLIB)/build ; \
1053                 ln -s $(objtree) $(MODLIB)/build ; \
1054         fi
1055         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1056
1057 # This depmod is only for convenience to give the initial
1058 # boot a modules.dep even before / is mounted read-write.  However the
1059 # boot script depmod is the master version.
1060 PHONY += _modinst_post
1061 _modinst_post: _modinst_
1062         $(call cmd,depmod)
1063
1064 else # CONFIG_MODULES
1065
1066 # Modules not configured
1067 # ---------------------------------------------------------------------------
1068
1069 modules modules_install: FORCE
1070         @echo
1071         @echo "The present kernel configuration has modules disabled."
1072         @echo "Type 'make config' and enable loadable module support."
1073         @echo "Then build a kernel with module support enabled."
1074         @echo
1075         @exit 1
1076
1077 endif # CONFIG_MODULES
1078
1079 ###
1080 # Cleaning is done on three levels.
1081 # make clean     Delete most generated files
1082 #                Leave enough to build external modules
1083 # make mrproper  Delete the current configuration, and all generated files
1084 # make distclean Remove editor backup files, patch leftover files and the like
1085
1086 # Directories & files removed with 'make clean'
1087 CLEAN_DIRS  += $(MODVERDIR)
1088 CLEAN_FILES +=  vmlinux System.map \
1089                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1090
1091 # Directories & files removed with 'make mrproper'
1092 MRPROPER_DIRS  += include/config include2 usr/include
1093 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1094                   include/linux/autoconf.h include/linux/version.h      \
1095                   include/linux/utsrelease.h                            \
1096                   Module.symvers tags TAGS cscope*
1097
1098 # clean - Delete most, but leave enough to build external modules
1099 #
1100 clean: rm-dirs  := $(CLEAN_DIRS)
1101 clean: rm-files := $(CLEAN_FILES)
1102 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1103
1104 PHONY += $(clean-dirs) clean archclean
1105 $(clean-dirs):
1106         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1107
1108 clean: archclean $(clean-dirs)
1109         $(call cmd,rmdirs)
1110         $(call cmd,rmfiles)
1111         @find . $(RCS_FIND_IGNORE) \
1112                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1113                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1114                 -o -name '*.symtypes' \) \
1115                 -type f -print | xargs rm -f
1116
1117 # mrproper - Delete all generated files, including .config
1118 #
1119 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1120 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1121 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1122
1123 PHONY += $(mrproper-dirs) mrproper archmrproper
1124 $(mrproper-dirs):
1125         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1126
1127 mrproper: clean archmrproper $(mrproper-dirs)
1128         $(call cmd,rmdirs)
1129         $(call cmd,rmfiles)
1130
1131 # distclean
1132 #
1133 PHONY += distclean
1134
1135 distclean: mrproper
1136         @find $(srctree) $(RCS_FIND_IGNORE) \
1137                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1138                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1139                 -o -name '.*.rej' -o -size 0 \
1140                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1141                 -type f -print | xargs rm -f
1142
1143
1144 # Packaging of the kernel to various formats
1145 # ---------------------------------------------------------------------------
1146 # rpm target kept for backward compatibility
1147 package-dir     := $(srctree)/scripts/package
1148
1149 %pkg: include/config/kernel.release FORCE
1150         $(Q)$(MAKE) $(build)=$(package-dir) $@
1151 rpm: include/config/kernel.release FORCE
1152         $(Q)$(MAKE) $(build)=$(package-dir) $@
1153
1154
1155 # Brief documentation of the typical targets used
1156 # ---------------------------------------------------------------------------
1157
1158 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1159 boards := $(notdir $(boards))
1160
1161 help:
1162         @echo  'Cleaning targets:'
1163         @echo  '  clean           - Remove most generated files but keep the config and'
1164         @echo  '                    enough build support to build external modules'
1165         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1166         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1167         @echo  ''
1168         @echo  'Configuration targets:'
1169         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1170         @echo  ''
1171         @echo  'Other generic targets:'
1172         @echo  '  all             - Build all targets marked with [*]'
1173         @echo  '* vmlinux         - Build the bare kernel'
1174         @echo  '* modules         - Build all modules'
1175         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1176         @echo  '  dir/            - Build all files in dir and below'
1177         @echo  '  dir/file.[ois]  - Build specified target only'
1178         @echo  '  dir/file.ko     - Build module including final link'
1179         @echo  '  rpm             - Build a kernel as an RPM package'
1180         @echo  '  tags/TAGS       - Generate tags file for editors'
1181         @echo  '  cscope          - Generate cscope index'
1182         @echo  '  kernelrelease   - Output the release version string'
1183         @echo  '  kernelversion   - Output the version stored in Makefile'
1184         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1185          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1186          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1187          fi
1188         @echo  ''
1189         @echo  'Static analysers'
1190         @echo  '  checkstack      - Generate a list of stack hogs'
1191         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1192         @echo  '  export_report   - List the usages of all exported symbols'
1193         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1194          echo  '  headers_check   - Sanity check on exported headers'; \
1195          fi
1196         @echo  ''
1197         @echo  'Kernel packaging:'
1198         @$(MAKE) $(build)=$(package-dir) help
1199         @echo  ''
1200         @echo  'Documentation targets:'
1201         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1202         @echo  ''
1203         @echo  'Architecture specific targets ($(ARCH)):'
1204         @$(if $(archhelp),$(archhelp),\
1205                 echo '  No architecture specific help defined for $(ARCH)')
1206         @echo  ''
1207         @$(if $(boards), \
1208                 $(foreach b, $(boards), \
1209                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1210                 echo '')
1211
1212         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1213         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1214         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1215         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1216         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1217         @echo  ''
1218         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1219         @echo  'For further info see the ./README file'
1220
1221
1222 # Documentation targets
1223 # ---------------------------------------------------------------------------
1224 %docs: scripts_basic FORCE
1225         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1226
1227 else # KBUILD_EXTMOD
1228
1229 ###
1230 # External module support.
1231 # When building external modules the kernel used as basis is considered
1232 # read-only, and no consistency checks are made and the make
1233 # system is not used on the basis kernel. If updates are required
1234 # in the basis kernel ordinary make commands (without M=...) must
1235 # be used.
1236 #
1237 # The following are the only valid targets when building external
1238 # modules.
1239 # make M=dir clean     Delete all automatically generated files
1240 # make M=dir modules   Make all modules in specified dir
1241 # make M=dir           Same as 'make M=dir modules'
1242 # make M=dir modules_install
1243 #                      Install the modules built in the module directory
1244 #                      Assumes install directory is already created
1245
1246 # We are always building modules
1247 KBUILD_MODULES := 1
1248 PHONY += crmodverdir
1249 crmodverdir:
1250         $(cmd_crmodverdir)
1251
1252 PHONY += $(objtree)/Module.symvers
1253 $(objtree)/Module.symvers:
1254         @test -e $(objtree)/Module.symvers || ( \
1255         echo; \
1256         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1257         echo "           is missing; modules will have no dependencies and modversions."; \
1258         echo )
1259
1260 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1261 PHONY += $(module-dirs) modules
1262 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1263         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1264
1265 modules: $(module-dirs)
1266         @echo '  Building modules, stage 2.';
1267         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1268
1269 PHONY += modules_install
1270 modules_install: _emodinst_ _emodinst_post
1271
1272 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1273 PHONY += _emodinst_
1274 _emodinst_:
1275         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1276         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1277
1278 PHONY += _emodinst_post
1279 _emodinst_post: _emodinst_
1280         $(call cmd,depmod)
1281
1282 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1283
1284 PHONY += $(clean-dirs) clean
1285 $(clean-dirs):
1286         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1287
1288 clean:  rm-dirs := $(MODVERDIR)
1289 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1290 clean: $(clean-dirs)
1291         $(call cmd,rmdirs)
1292         $(call cmd,rmfiles)
1293         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1294                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1295                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1296                 -type f -print | xargs rm -f
1297
1298 help:
1299         @echo  '  Building external modules.'
1300         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1301         @echo  ''
1302         @echo  '  modules         - default target, build the module(s)'
1303         @echo  '  modules_install - install the module'
1304         @echo  '  clean           - remove generated files in module directory only'
1305         @echo  ''
1306
1307 # Dummies...
1308 PHONY += prepare scripts
1309 prepare: ;
1310 scripts: ;
1311 endif # KBUILD_EXTMOD
1312
1313 # Generate tags for editors
1314 # ---------------------------------------------------------------------------
1315
1316 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1317 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1318 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1319
1320 ifeq ($(src),$(obj))
1321 __srctree =
1322 else
1323 __srctree = $(srctree)/
1324 endif
1325
1326 ifeq ($(ALLSOURCE_ARCHS),)
1327 ifeq ($(ARCH),um)
1328 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1329 else
1330 ALLINCLUDE_ARCHS := $(SRCARCH)
1331 endif
1332 else
1333 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1334 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1335 endif
1336
1337 # Take care of arch/x86
1338 ifeq ($(ARCH), $(SRCARCH))
1339 ALLSOURCE_ARCHS := $(ARCH)
1340 else
1341 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1342 endif
1343
1344 define find-sources
1345         ( for arch in $(ALLSOURCE_ARCHS) ; do \
1346                find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1347                     -name $1 -print; \
1348           done ; \
1349           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1350                -name $1 -print; \
1351           find $(__srctree)include $(RCS_FIND_IGNORE) \
1352                \( -name config -o -name 'asm-*' \) -prune \
1353                -o -name $1 -print; \
1354           for arch in $(ALLINCLUDE_ARCHS) ; do \
1355                find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1356                     -name $1 -print; \
1357           done ; \
1358           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1359                -name $1 -print; \
1360           find $(__srctree) $(RCS_FIND_IGNORE) \
1361                \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1362                -name $1 -print; \
1363           )
1364 endef
1365
1366 define all-sources
1367         $(call find-sources,'*.[chS]')
1368 endef
1369 define all-kconfigs
1370         $(call find-sources,'Kconfig*')
1371 endef
1372 define all-defconfigs
1373         $(call find-sources,'defconfig')
1374 endef
1375
1376 define xtags
1377         if $1 --version 2>&1 | grep -iq exuberant; then \
1378             $(all-sources) | xargs $1 -a \
1379                 -I __initdata,__exitdata,__acquires,__releases \
1380                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1381                 --extra=+f --c-kinds=+px \
1382                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1383             $(all-kconfigs) | xargs $1 -a \
1384                 --langdef=kconfig \
1385                 --language-force=kconfig \
1386                 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1387             $(all-defconfigs) | xargs -r $1 -a \
1388                 --langdef=dotconfig \
1389                 --language-force=dotconfig \
1390                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1391         elif $1 --version 2>&1 | grep -iq emacs; then \
1392             $(all-sources) | xargs $1 -a; \
1393             $(all-kconfigs) | xargs $1 -a \
1394                 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1395             $(all-defconfigs) | xargs -r $1 -a \
1396                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1397         else \
1398             $(all-sources) | xargs $1 -a; \
1399         fi
1400 endef
1401
1402 quiet_cmd_cscope-file = FILELST cscope.files
1403       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1404
1405 quiet_cmd_cscope = MAKE    cscope.out
1406       cmd_cscope = cscope -b
1407
1408 cscope: FORCE
1409         $(call cmd,cscope-file)
1410         $(call cmd,cscope)
1411
1412 quiet_cmd_TAGS = MAKE   $@
1413 define cmd_TAGS
1414         rm -f $@; \
1415         $(call xtags,etags)
1416 endef
1417
1418 TAGS: FORCE
1419         $(call cmd,TAGS)
1420
1421 quiet_cmd_tags = MAKE   $@
1422 define cmd_tags
1423         rm -f $@; \
1424         $(call xtags,ctags)
1425 endef
1426
1427 tags: FORCE
1428         $(call cmd,tags)
1429
1430
1431 # Scripts to check various things for consistency
1432 # ---------------------------------------------------------------------------
1433
1434 includecheck:
1435         find * $(RCS_FIND_IGNORE) \
1436                 -name '*.[hcS]' -type f -print | sort \
1437                 | xargs $(PERL) -w scripts/checkincludes.pl
1438
1439 versioncheck:
1440         find * $(RCS_FIND_IGNORE) \
1441                 -name '*.[hcS]' -type f -print | sort \
1442                 | xargs $(PERL) -w scripts/checkversion.pl
1443
1444 namespacecheck:
1445         $(PERL) $(srctree)/scripts/namespace.pl
1446
1447 export_report:
1448         $(PERL) $(srctree)/scripts/export_report.pl
1449
1450 endif #ifeq ($(config-targets),1)
1451 endif #ifeq ($(mixed-targets),1)
1452
1453 PHONY += checkstack kernelrelease kernelversion
1454
1455 # UML needs a little special treatment here.  It wants to use the host
1456 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1457 # else wants $(ARCH), including people doing cross-builds, which means
1458 # that $(SUBARCH) doesn't work here.
1459 ifeq ($(ARCH), um)
1460 CHECKSTACK_ARCH := $(SUBARCH)
1461 else
1462 CHECKSTACK_ARCH := $(ARCH)
1463 endif
1464 checkstack:
1465         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1466         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1467
1468 kernelrelease:
1469         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1470         $(error kernelrelease not valid - run 'make prepare' to update it))
1471 kernelversion:
1472         @echo $(KERNELVERSION)
1473
1474 # Single targets
1475 # ---------------------------------------------------------------------------
1476 # Single targets are compatible with:
1477 # - build whith mixed source and output
1478 # - build with separate output dir 'make O=...'
1479 # - external modules
1480 #
1481 #  target-dir => where to store outputfile
1482 #  build-dir  => directory in kernel source tree to use
1483
1484 ifeq ($(KBUILD_EXTMOD),)
1485         build-dir  = $(patsubst %/,%,$(dir $@))
1486         target-dir = $(dir $@)
1487 else
1488         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1489         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1490         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1491 endif
1492
1493 %.s: %.c prepare scripts FORCE
1494         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495 %.i: %.c prepare scripts FORCE
1496         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497 %.o: %.c prepare scripts FORCE
1498         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499 %.lst: %.c prepare scripts FORCE
1500         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501 %.s: %.S prepare scripts FORCE
1502         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503 %.o: %.S prepare scripts FORCE
1504         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1505 %.symtypes: %.c prepare scripts FORCE
1506         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1507
1508 # Modules
1509 / %/: prepare scripts FORCE
1510         $(cmd_crmodverdir)
1511         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512         $(build)=$(build-dir)
1513 %.ko: prepare scripts FORCE
1514         $(cmd_crmodverdir)
1515         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1516         $(build)=$(build-dir) $(@:.ko=.o)
1517         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1518
1519 # FIXME Should go into a make.lib or something
1520 # ===========================================================================
1521
1522 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1523       cmd_rmdirs = rm -rf $(rm-dirs)
1524
1525 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1526       cmd_rmfiles = rm -f $(rm-files)
1527
1528 # Run depmod only is we have System.map and depmod is executable
1529 # and we build for the host arch
1530 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1531       cmd_depmod = \
1532         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1533                 $(DEPMOD) -ae -F System.map                                     \
1534                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1535                 $(KERNELRELEASE);                                               \
1536         fi
1537
1538 # Create temporary dir for module support files
1539 # clean it up only when building all modules
1540 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1541                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1542
1543 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1544           $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1545           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1546
1547 quiet_cmd_as_o_S = AS      $@
1548 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1549
1550 # read all saved command lines
1551
1552 targets := $(wildcard $(sort $(targets)))
1553 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1554
1555 ifneq ($(cmd_files),)
1556   $(cmd_files): ;       # Do not try to update included dependency files
1557   include $(cmd_files)
1558 endif
1559
1560 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1561 # Usage:
1562 # $(Q)$(MAKE) $(clean)=dir
1563 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1564
1565 endif   # skip-makefile
1566
1567 PHONY += FORCE
1568 FORCE:
1569
1570 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1571 Makefile: ;
1572
1573 # Declare the contents of the .PHONY variable as phony.  We keep that
1574 # information in a variable se we can use it in if_changed and friends.
1575 .PHONY: $(PHONY)