Makefile

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 145 # FIXME - TOPDIR is obsolete, use srctree/objtree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