Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 24
   4 EXTRAVERSION = -rc1
   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 # for i386 and x86_64 we use SRCARCH equal to x86
 201 SRCARCH := $(if $(filter x86_64 i386,$(SRCARCH)),x86,$(SRCARCH))
 202
 203 KCONFIG_CONFIG  ?= .config
 204
 205 # SHELL used by kbuild
 206 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 207           else if [ -x /bin/bash ]; then echo /bin/bash; \
 208           else echo sh; fi ; fi)
 209
 210 HOSTCC       = gcc
 211 HOSTCXX      = g++
 212 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 213 HOSTCXXFLAGS = -O2
 214
 215 # Decide whether to build built-in, modular, or both.
 216 # Normally, just do built-in.
 217
 218 KBUILD_MODULES :=
 219 KBUILD_BUILTIN := 1
 220
 221 #       If we have only "make modules", don't compile built-in objects.
 222 #       When we're building modules with modversions, we need to consider
 223 #       the built-in objects during the descend as well, in order to
 224 #       make sure the checksums are up to date before we record them.
 225
 226 ifeq ($(MAKECMDGOALS),modules)
 227   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 228 endif
 229
 230 #       If we have "make <whatever> modules", compile modules
 231 #       in addition to whatever we do anyway.
 232 #       Just "make" or "make all" shall build modules as well
 233
 234 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 235   KBUILD_MODULES := 1
 236 endif
 237
 238 ifeq ($(MAKECMDGOALS),)
 239   KBUILD_MODULES := 1
 240 endif
 241
 242 export KBUILD_MODULES KBUILD_BUILTIN
 243 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 244
 245 # Beautify output
 246 # ---------------------------------------------------------------------------
 247 #
 248 # Normally, we echo the whole command before executing it. By making
 249 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 250 # $(quiet) to choose other forms of output instead, e.g.
 251 #
 252 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 253 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 254 #
 255 # If $(quiet) is empty, the whole command will be printed.
 256 # If it is set to "quiet_", only the short version will be printed.
 257 # If it is set to "silent_", nothing will be printed at all, since
 258 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 259 #
 260 # A simple variant is to prefix commands with $(Q) - that's useful
 261 # for commands that shall be hidden in non-verbose mode.
 262 #
 263 #       $(Q)ln $@ :<
 264 #
 265 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 266 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 267
 268 ifeq ($(KBUILD_VERBOSE),1)
 269   quiet =
 270   Q =
 271 else
 272   quiet=quiet_
 273   Q = @
 274 endif
 275
 276 # If the user is running make -s (silent mode), suppress echoing of
 277 # commands
 278
 279 ifneq ($(findstring s,$(MAKEFLAGS)),)
 280   quiet=silent_
 281 endif
 282
 283 export quiet Q KBUILD_VERBOSE
 284
 285
 286 # Look for make include files relative to root of kernel src
 287 MAKEFLAGS += --include-dir=$(srctree)
 288
 289 # We need some generic definitions.
 290 include $(srctree)/scripts/Kbuild.include
 291
 292 # Make variables (CC, etc...)
 293
 294 AS              = $(CROSS_COMPILE)as
 295 LD              = $(CROSS_COMPILE)ld
 296 CC              = $(CROSS_COMPILE)gcc
 297 CPP             = $(CC) -E
 298 AR              = $(CROSS_COMPILE)ar
 299 NM              = $(CROSS_COMPILE)nm
 300 STRIP           = $(CROSS_COMPILE)strip
 301 OBJCOPY         = $(CROSS_COMPILE)objcopy
 302 OBJDUMP         = $(CROSS_COMPILE)objdump
 303 AWK             = awk
 304 GENKSYMS        = scripts/genksyms/genksyms
 305 DEPMOD          = /sbin/depmod
 306 KALLSYMS        = scripts/kallsyms
 307 PERL            = perl
 308 CHECK           = sparse
 309
 310 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 311 MODFLAGS        = -DMODULE
 312 CFLAGS_MODULE   = $(MODFLAGS)
 313 AFLAGS_MODULE   = $(MODFLAGS)
 314 LDFLAGS_MODULE  =
 315 CFLAGS_KERNEL   =
 316 AFLAGS_KERNEL   =
 317
 318
 319 # Use LINUXINCLUDE when you must reference the include/ directory.
 320 # Needed to be compatible with the O= option
 321 LINUXINCLUDE    := -Iinclude \
 322                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 323                    -include include/linux/autoconf.h
 324
 325 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 326
 327 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 328                    -fno-strict-aliasing -fno-common \
 329                    -Werror-implicit-function-declaration
 330 KBUILD_AFLAGS   := -D__ASSEMBLY__
 331
 332 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 333 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 334 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 335
 336 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 337 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 338 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 339 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 340
 341 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 342 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 343 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 344
 345 # When compiling out-of-tree modules, put MODVERDIR in the module
 346 # tree rather than in the kernel tree. The kernel tree might
 347 # even be read-only.
 348 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 349
 350 # Files to ignore in find ... statements
 351
 352 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
 353 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 354
 355 # ===========================================================================
 356 # Rules shared between *config targets and build targets
 357
 358 # Basic helpers built in scripts/
 359 PHONY += scripts_basic
 360 scripts_basic:
 361         $(Q)$(MAKE) $(build)=scripts/basic
 362
 363 # To avoid any implicit rule to kick in, define an empty command.
 364 scripts/basic/%: scripts_basic ;
 365
 366 PHONY += outputmakefile
 367 # outputmakefile generates a Makefile in the output directory, if using a
 368 # separate output directory. This allows convenient use of make in the
 369 # output directory.
 370 outputmakefile:
 371 ifneq ($(KBUILD_SRC),)
 372         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 373             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 374 endif
 375
 376 # To make sure we do not include .config for any of the *config targets
 377 # catch them early, and hand them over to scripts/kconfig/Makefile
 378 # It is allowed to specify more targets when calling make, including
 379 # mixing *config targets and build targets.
 380 # For example 'make oldconfig all'.
 381 # Detect when mixed targets is specified, and make a second invocation
 382 # of make so .config is not included in this case either (for *config).
 383
 384 no-dot-config-targets := clean mrproper distclean \
 385                          cscope TAGS tags help %docs check% \
 386                          include/linux/version.h headers_% \
 387                          kernelrelease kernelversion
 388
 389 config-targets := 0
 390 mixed-targets  := 0
 391 dot-config     := 1
 392
 393 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 394         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 395                 dot-config := 0
 396         endif
 397 endif
 398
 399 ifeq ($(KBUILD_EXTMOD),)
 400         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 401                 config-targets := 1
 402                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 403                         mixed-targets := 1
 404                 endif
 405         endif
 406 endif
 407
 408 ifeq ($(mixed-targets),1)
 409 # ===========================================================================
 410 # We're called with mixed targets (*config and build targets).
 411 # Handle them one by one.
 412
 413 %:: FORCE
 414         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 415
 416 else
 417 ifeq ($(config-targets),1)
 418 # ===========================================================================
 419 # *config targets only - make sure prerequisites are updated, and descend
 420 # in scripts/kconfig to make the *config target
 421
 422 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 423 # KBUILD_DEFCONFIG may point out an alternative default configuration
 424 # used for 'make defconfig'
 425 include $(srctree)/arch/$(SRCARCH)/Makefile
 426 export KBUILD_DEFCONFIG
 427
 428 config %config: scripts_basic outputmakefile FORCE
 429         $(Q)mkdir -p include/linux include/config
 430         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 431
 432 else
 433 # ===========================================================================
 434 # Build targets only - this includes vmlinux, arch specific targets, clean
 435 # targets and others. In general all targets except *config targets.
 436
 437 ifeq ($(KBUILD_EXTMOD),)
 438 # Additional helpers built in scripts/
 439 # Carefully list dependencies so we do not try to build scripts twice
 440 # in parallel
 441 PHONY += scripts
 442 scripts: scripts_basic include/config/auto.conf
 443         $(Q)$(MAKE) $(build)=$(@)
 444
 445 # Objects we will link into vmlinux / subdirs we need to visit
 446 init-y          := init/
 447 drivers-y       := drivers/ sound/
 448 net-y           := net/
 449 libs-y          := lib/
 450 core-y          := usr/
 451 endif # KBUILD_EXTMOD
 452
 453 ifeq ($(dot-config),1)
 454 # Read in config
 455 -include include/config/auto.conf
 456
 457 ifeq ($(KBUILD_EXTMOD),)
 458 # Read in dependencies to all Kconfig* files, make sure to run
 459 # oldconfig if changes are detected.
 460 -include include/config/auto.conf.cmd
 461
 462 # To avoid any implicit rule to kick in, define an empty command
 463 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 464
 465 # If .config is newer than include/config/auto.conf, someone tinkered
 466 # with it and forgot to run make oldconfig.
 467 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 468 # we execute the config step to be sure to catch updated Kconfig files
 469 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 470         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 471 else
 472 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 473 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 474 PHONY += include/config/auto.conf
 475
 476 include/config/auto.conf:
 477         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 478         echo;                                                           \
 479         echo "  ERROR: Kernel configuration is invalid.";               \
 480         echo "         include/linux/autoconf.h or $@ are missing.";    \
 481         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 482         echo;                                                           \
 483         /bin/false)
 484
 485 endif # KBUILD_EXTMOD
 486
 487 else
 488 # Dummy target needed, because used as prerequisite
 489 include/config/auto.conf: ;
 490 endif # $(dot-config)
 491
 492 # The all: target is the default when no target is given on the
 493 # command line.
 494 # This allow a user to issue only 'make' to build a kernel including modules
 495 # Defaults vmlinux but it is usually overridden in the arch makefile
 496 all: vmlinux
 497
 498 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 499 KBUILD_CFLAGS   += -Os
 500 else
 501 KBUILD_CFLAGS   += -O2
 502 endif
 503
 504 include $(srctree)/arch/$(SRCARCH)/Makefile
 505
 506 ifdef CONFIG_FRAME_POINTER
 507 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 508 else
 509 KBUILD_CFLAGS   += -fomit-frame-pointer
 510 endif
 511
 512 ifdef CONFIG_DEBUG_INFO
 513 KBUILD_CFLAGS   += -g
 514 KBUILD_AFLAGS   += -gdwarf-2
 515 endif
 516
 517 # Force gcc to behave correct even for buggy distributions
 518 KBUILD_CFLAGS         += $(call cc-option, -fno-stack-protector)
 519
 520 # arch Makefile may override CC so keep this after arch Makefile is included
 521 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 522 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 523
 524 # warn about C99 declaration after statement
 525 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 526
 527 # disable pointer signed / unsigned warnings in gcc 4.0
 528 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 529
 530 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 531 KBUILD_CPPFLAGS += $(CPPFLAGS)
 532 KBUILD_AFLAGS   += $(AFLAGS)
 533 KBUILD_CFLAGS   += $(CFLAGS)
 534
 535 # Use --build-id when available.
 536 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 537                               $(call ld-option, -Wl$(comma)--build-id,))
 538 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 539 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 540
 541 # Default kernel image to build when no specific target is given.
 542 # KBUILD_IMAGE may be overruled on the command line or
 543 # set in the environment
 544 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 545 # this default value
 546 export KBUILD_IMAGE ?= vmlinux
 547
 548 #
 549 # INSTALL_PATH specifies where to place the updated kernel and system map
 550 # images. Default is /boot, but you can set it to other values
 551 export  INSTALL_PATH ?= /boot
 552
 553 #
 554 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 555 # relocations required by build roots.  This is not defined in the
 556 # makefile but the argument can be passed to make if needed.
 557 #
 558
 559 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 560 export MODLIB
 561
 562 #
 563 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 564 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 565 #  the default option --strip-debug will be used.  Otherwise,
 566 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 567
 568 ifdef INSTALL_MOD_STRIP
 569 ifeq ($(INSTALL_MOD_STRIP),1)
 570 mod_strip_cmd = $(STRIP) --strip-debug
 571 else
 572 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 573 endif # INSTALL_MOD_STRIP=1
 574 else
 575 mod_strip_cmd = true
 576 endif # INSTALL_MOD_STRIP
 577 export mod_strip_cmd
 578
 579
 580 ifeq ($(KBUILD_EXTMOD),)
 581 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 582
 583 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 584                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 585                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 586
 587 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 588                      $(init-n) $(init-) \
 589                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 590                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 591
 592 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 593 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 594 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 595 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 596 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 597 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 598 libs-y          := $(libs-y1) $(libs-y2)
 599
 600 # Build vmlinux
 601 # ---------------------------------------------------------------------------
 602 # vmlinux is built from the objects selected by $(vmlinux-init) and
 603 # $(vmlinux-main). Most are built-in.o files from top-level directories
 604 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 605 # Ordering when linking is important, and $(vmlinux-init) must be first.
 606 #
 607 # vmlinux
 608 #   ^
 609 #   |
 610 #   +-< $(vmlinux-init)
 611 #   |   +--< init/version.o + more
 612 #   |
 613 #   +--< $(vmlinux-main)
 614 #   |    +--< driver/built-in.o mm/built-in.o + more
 615 #   |
 616 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 617 #
 618 # vmlinux version (uname -v) cannot be updated during normal
 619 # descending-into-subdirs phase since we do not yet know if we need to
 620 # update vmlinux.
 621 # Therefore this step is delayed until just before final link of vmlinux -
 622 # except in the kallsyms case where it is done just before adding the
 623 # symbols to the kernel.
 624 #
 625 # System.map is generated to document addresses of all kernel symbols
 626
 627 vmlinux-init := $(head-y) $(init-y)
 628 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 629 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 630 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 631 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 632
 633 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 634 # May be overridden by arch/$(ARCH)/Makefile
 635 quiet_cmd_vmlinux__ ?= LD      $@
 636       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 637       -T $(vmlinux-lds) $(vmlinux-init)                          \
 638       --start-group $(vmlinux-main) --end-group                  \
 639       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 640
 641 # Generate new vmlinux version
 642 quiet_cmd_vmlinux_version = GEN     .version
 643       cmd_vmlinux_version = set -e;                     \
 644         if [ ! -r .version ]; then                      \
 645           rm -f .version;                               \
 646           echo 1 >.version;                             \
 647         else                                            \
 648           mv .version .old_version;                     \
 649           expr 0$$(cat .old_version) + 1 >.version;     \
 650         fi;                                             \
 651         $(MAKE) $(build)=init
 652
 653 # Generate System.map
 654 quiet_cmd_sysmap = SYSMAP
 655       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 656
 657 # Link of vmlinux
 658 # If CONFIG_KALLSYMS is set .version is already updated
 659 # Generate System.map and verify that the content is consistent
 660 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 661 # First command is ':' to allow us to use + in front of the rule
 662 define rule_vmlinux__
 663         :
 664         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 665
 666         $(call cmd,vmlinux__)
 667         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 668
 669         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 670           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 671         $(cmd_sysmap) $@ System.map;                                         \
 672         if [ $$? -ne 0 ]; then                                               \
 673                 rm -f $@;                                                    \
 674                 /bin/false;                                                  \
 675         fi;
 676         $(verify_kallsyms)
 677 endef
 678
 679
 680 ifdef CONFIG_KALLSYMS
 681 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 682 # It's a three stage process:
 683 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 684 #   empty
 685 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 686 #   the right size - vmlinux version (uname -v) is updated during this step
 687 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 688 #   but due to the added section, some addresses have shifted.
 689 #   From here, we generate a correct .tmp_kallsyms2.o
 690 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 691 # o Verify that the System.map from vmlinux matches the map from
 692 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 693 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 694 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 695 #   temporary bypass to allow the kernel to be built while the
 696 #   maintainers work out what went wrong with kallsyms.
 697
 698 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 699 last_kallsyms := 3
 700 else
 701 last_kallsyms := 2
 702 endif
 703
 704 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 705
 706 define verify_kallsyms
 707         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 708           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 709           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 710         $(Q)cmp -s System.map .tmp_System.map ||                             \
 711                 (echo Inconsistent kallsyms data;                            \
 712                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 713                  rm .tmp_kallsyms* ; /bin/false )
 714 endef
 715
 716 # Update vmlinux version before link
 717 # Use + in front of this rule to silent warning about make -j1
 718 # First command is ':' to allow us to use + in front of this rule
 719 cmd_ksym_ld = $(cmd_vmlinux__)
 720 define rule_ksym_ld
 721         :
 722         +$(call cmd,vmlinux_version)
 723         $(call cmd,vmlinux__)
 724         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 725 endef
 726
 727 # Generate .S file with all kernel symbols
 728 quiet_cmd_kallsyms = KSYM    $@
 729       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 730                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 731
 732 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 733         $(call if_changed_dep,as_o_S)
 734
 735 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 736         $(call cmd,kallsyms)
 737
 738 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 739 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 740         $(call if_changed_rule,ksym_ld)
 741
 742 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 743         $(call if_changed,vmlinux__)
 744
 745 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 746         $(call if_changed,vmlinux__)
 747
 748 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 749 $(KALLSYMS): scripts ;
 750
 751 # Generate some data for debugging strange kallsyms problems
 752 debug_kallsyms: .tmp_map$(last_kallsyms)
 753
 754 .tmp_map%: .tmp_vmlinux% FORCE
 755         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 756
 757 .tmp_map3: .tmp_map2
 758
 759 .tmp_map2: .tmp_map1
 760
 761 endif # ifdef CONFIG_KALLSYMS
 762
 763 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 764 # relevant sections renamed as per the linker script.
 765 quiet_cmd_vmlinux-modpost = LD      $@
 766       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 767          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 768          $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
 769 define rule_vmlinux-modpost
 770         :
 771         +$(call cmd,vmlinux-modpost)
 772         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 773         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 774 endef
 775
 776 # vmlinux image - including updated kernel symbols
 777 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
 778 ifdef CONFIG_HEADERS_CHECK
 779         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 780 endif
 781 ifdef CONFIG_SAMPLES
 782         $(Q)$(MAKE) $(build)=samples
 783 endif
 784         $(call vmlinux-modpost)
 785         $(call if_changed_rule,vmlinux__)
 786         $(Q)rm -f .old_version
 787
 788 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 789         $(call if_changed_rule,vmlinux-modpost)
 790
 791 # The actual objects are generated when descending,
 792 # make sure no implicit rule kicks in
 793 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 794
 795 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 796 # Preset locale variables to speed up the build process. Limit locale
 797 # tweaks to this spot to avoid wrong language settings when running
 798 # make menuconfig etc.
 799 # Error messages still appears in the original language
 800
 801 PHONY += $(vmlinux-dirs)
 802 $(vmlinux-dirs): prepare scripts
 803         $(Q)$(MAKE) $(build)=$@
 804
 805 # Build the kernel release string
 806 #
 807 # The KERNELRELEASE value built here is stored in the file
 808 # include/config/kernel.release, and is used when executing several
 809 # make targets, such as "make install" or "make modules_install."
 810 #
 811 # The eventual kernel release string consists of the following fields,
 812 # shown in a hierarchical format to show how smaller parts are concatenated
 813 # to form the larger and final value, with values coming from places like
 814 # the Makefile, kernel config options, make command line options and/or
 815 # SCM tag information.
 816 #
 817 #       $(KERNELVERSION)
 818 #         $(VERSION)                    eg, 2
 819 #         $(PATCHLEVEL)                 eg, 6
 820 #         $(SUBLEVEL)                   eg, 18
 821 #         $(EXTRAVERSION)               eg, -rc6
 822 #       $(localver-full)
 823 #         $(localver)
 824 #           localversion*               (files without backups, containing '~')
 825 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 826 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 827 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 828 #           $(LOCALVERSION)             (from make command line if provided)
 829 #
 830 #  Note how the final $(localver-auto) string is included *only* if the
 831 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 832 # moment, only git is supported but other SCMs can edit the script
 833 # scripts/setlocalversion and add the appropriate checks as needed.
 834
 835 pattern = ".*/localversion[^~]*"
 836 string  = $(shell cat /dev/null \
 837            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 838
 839 localver = $(subst $(space),, $(string) \
 840                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 841
 842 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 843 # and if the SCM is know a tag from the SCM is appended.
 844 # The appended tag is determined by the SCM used.
 845 #
 846 # Currently, only git is supported.
 847 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 848 # checks as needed.
 849 ifdef CONFIG_LOCALVERSION_AUTO
 850         _localver-auto = $(shell $(CONFIG_SHELL) \
 851                           $(srctree)/scripts/setlocalversion $(srctree))
 852         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 853 endif
 854
 855 localver-full = $(localver)$(localver-auto)
 856
 857 # Store (new) KERNELRELASE string in include/config/kernel.release
 858 kernelrelease = $(KERNELVERSION)$(localver-full)
 859 include/config/kernel.release: include/config/auto.conf FORCE
 860         $(Q)rm -f $@
 861         $(Q)echo $(kernelrelease) > $@
 862
 863
 864 # Things we need to do before we recursively start building the kernel
 865 # or the modules are listed in "prepare".
 866 # A multi level approach is used. prepareN is processed before prepareN-1.
 867 # archprepare is used in arch Makefiles and when processed asm symlink,
 868 # version.h and scripts_basic is processed / created.
 869
 870 # Listed in dependency order
 871 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 872
 873 # prepare3 is used to check if we are building in a separate output directory,
 874 # and if so do:
 875 # 1) Check that make has not been executed in the kernel src $(srctree)
 876 # 2) Create the include2 directory, used for the second asm symlink
 877 prepare3: include/config/kernel.release
 878 ifneq ($(KBUILD_SRC),)
 879         @echo '  Using $(srctree) as source for kernel'
 880         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 881                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 882                 echo "  in the '$(srctree)' directory.";\
 883                 /bin/false; \
 884         fi;
 885         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 886         $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 887 endif
 888
 889 # prepare2 creates a makefile if using a separate output directory
 890 prepare2: prepare3 outputmakefile
 891
 892 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 893                    include/asm include/config/auto.conf
 894         $(cmd_crmodverdir)
 895
 896 archprepare: prepare1 scripts_basic
 897
 898 prepare0: archprepare FORCE
 899         $(Q)$(MAKE) $(build)=.
 900         $(Q)$(MAKE) $(build)=. missing-syscalls
 901
 902 # All the preparing..
 903 prepare: prepare0
 904
 905 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 906 # done in arch/$(ARCH)/kernel/Makefile
 907
 908 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 909
 910 # The asm symlink changes when $(ARCH) changes.
 911 # Detect this and ask user to run make mrproper
 912
 913 include/asm: FORCE
 914         $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
 915         if [ -L include/asm ]; then                                     \
 916                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
 917                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 918                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 919                         exit 1;                                         \
 920                 fi;                                                     \
 921         else                                                            \
 922                 echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
 923                 if [ ! -d include ]; then                               \
 924                         mkdir -p include;                               \
 925                 fi;                                                     \
 926                 ln -fsn asm-$(SRCARCH) $@;                              \
 927         fi
 928
 929 # Generate some files
 930 # ---------------------------------------------------------------------------
 931
 932 # KERNELRELEASE can change from a few different places, meaning version.h
 933 # needs to be updated, so this check is forced on all builds
 934
 935 uts_len := 64
 936 define filechk_utsrelease.h
 937         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 938           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 939           exit 1;                                                         \
 940         fi;                                                               \
 941         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 942 endef
 943
 944 define filechk_version.h
 945         (echo \#define LINUX_VERSION_CODE $(shell                             \
 946         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 947         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 948 endef
 949
 950 include/linux/version.h: $(srctree)/Makefile FORCE
 951         $(call filechk,version.h)
 952
 953 include/linux/utsrelease.h: include/config/kernel.release FORCE
 954         $(call filechk,utsrelease.h)
 955
 956 # ---------------------------------------------------------------------------
 957
 958 PHONY += depend dep
 959 depend dep:
 960         @echo '*** Warning: make $@ is unnecessary now.'
 961
 962 # ---------------------------------------------------------------------------
 963 # Kernel headers
 964 INSTALL_HDR_PATH=$(objtree)/usr
 965 export INSTALL_HDR_PATH
 966
 967 HDRFILTER=generic i386 x86_64
 968 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
 969
 970 PHONY += headers_install_all
 971 headers_install_all: include/linux/version.h scripts_basic FORCE
 972         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 973         $(Q)for arch in $(HDRARCHES); do \
 974          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
 975          done
 976
 977 PHONY += headers_install
 978 headers_install: include/linux/version.h scripts_basic FORCE
 979         @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
 980           echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
 981           exit 1 ; fi
 982         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
 983         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
 984
 985 PHONY += headers_check_all
 986 headers_check_all: headers_install_all
 987         $(Q)for arch in $(HDRARCHES); do \
 988          $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
 989          done
 990
 991 PHONY += headers_check
 992 headers_check: headers_install
 993         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
 994
 995 # ---------------------------------------------------------------------------
 996 # Modules
 997
 998 ifdef CONFIG_MODULES
 999
1000 # By default, build modules as well
1001
1002 all: modules
1003
1004 #       Build modules
1005
1006 PHONY += modules
1007 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1008         @echo '  Building modules, stage 2.';
1009         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1010
1011
1012 # Target to prepare building external modules
1013 PHONY += modules_prepare
1014 modules_prepare: prepare scripts
1015
1016 # Target to install modules
1017 PHONY += modules_install
1018 modules_install: _modinst_ _modinst_post
1019
1020 PHONY += _modinst_
1021 _modinst_:
1022         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1023                 echo "Warning: you may need to install module-init-tools"; \
1024                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1025                 sleep 1; \
1026         fi
1027         @rm -rf $(MODLIB)/kernel
1028         @rm -f $(MODLIB)/source
1029         @mkdir -p $(MODLIB)/kernel
1030         @ln -s $(srctree) $(MODLIB)/source
1031         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1032                 rm -f $(MODLIB)/build ; \
1033                 ln -s $(objtree) $(MODLIB)/build ; \
1034         fi
1035         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1036
1037 # This depmod is only for convenience to give the initial
1038 # boot a modules.dep even before / is mounted read-write.  However the
1039 # boot script depmod is the master version.
1040 PHONY += _modinst_post
1041 _modinst_post: _modinst_
1042         $(call cmd,depmod)
1043
1044 else # CONFIG_MODULES
1045
1046 # Modules not configured
1047 # ---------------------------------------------------------------------------
1048
1049 modules modules_install: FORCE
1050         @echo
1051         @echo "The present kernel configuration has modules disabled."
1052         @echo "Type 'make config' and enable loadable module support."
1053         @echo "Then build a kernel with module support enabled."
1054         @echo
1055         @exit 1
1056
1057 endif # CONFIG_MODULES
1058
1059 ###
1060 # Cleaning is done on three levels.
1061 # make clean     Delete most generated files
1062 #                Leave enough to build external modules
1063 # make mrproper  Delete the current configuration, and all generated files
1064 # make distclean Remove editor backup files, patch leftover files and the like
1065
1066 # Directories & files removed with 'make clean'
1067 CLEAN_DIRS  += $(MODVERDIR)
1068 CLEAN_FILES +=  vmlinux System.map \
1069                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1070
1071 # Directories & files removed with 'make mrproper'
1072 MRPROPER_DIRS  += include/config include2 usr/include
1073 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1074                   include/linux/autoconf.h include/linux/version.h      \
1075                   include/linux/utsrelease.h                            \
1076                   Module.symvers tags TAGS cscope*
1077
1078 # clean - Delete most, but leave enough to build external modules
1079 #
1080 clean: rm-dirs  := $(CLEAN_DIRS)
1081 clean: rm-files := $(CLEAN_FILES)
1082 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1083
1084 PHONY += $(clean-dirs) clean archclean
1085 $(clean-dirs):
1086         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1087
1088 clean: archclean $(clean-dirs)
1089         $(call cmd,rmdirs)
1090         $(call cmd,rmfiles)
1091         @find . $(RCS_FIND_IGNORE) \
1092                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1093                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1094                 -o -name '*.symtypes' \) \
1095                 -type f -print | xargs rm -f
1096
1097 # mrproper - Delete all generated files, including .config
1098 #
1099 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1100 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1101 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1102
1103 PHONY += $(mrproper-dirs) mrproper archmrproper
1104 $(mrproper-dirs):
1105         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1106
1107 mrproper: clean archmrproper $(mrproper-dirs)
1108         $(call cmd,rmdirs)
1109         $(call cmd,rmfiles)
1110
1111 # distclean
1112 #
1113 PHONY += distclean
1114
1115 distclean: mrproper
1116         @find $(srctree) $(RCS_FIND_IGNORE) \
1117                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1118                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1119                 -o -name '.*.rej' -o -size 0 \
1120                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1121                 -type f -print | xargs rm -f
1122
1123
1124 # Packaging of the kernel to various formats
1125 # ---------------------------------------------------------------------------
1126 # rpm target kept for backward compatibility
1127 package-dir     := $(srctree)/scripts/package
1128
1129 %pkg: include/config/kernel.release FORCE
1130         $(Q)$(MAKE) $(build)=$(package-dir) $@
1131 rpm: include/config/kernel.release FORCE
1132         $(Q)$(MAKE) $(build)=$(package-dir) $@
1133
1134
1135 # Brief documentation of the typical targets used
1136 # ---------------------------------------------------------------------------
1137
1138 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1139 boards := $(notdir $(boards))
1140
1141 help:
1142         @echo  'Cleaning targets:'
1143         @echo  '  clean           - Remove most generated files but keep the config and'
1144         @echo  '                    enough build support to build external modules'
1145         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1146         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1147         @echo  ''
1148         @echo  'Configuration targets:'
1149         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1150         @echo  ''
1151         @echo  'Other generic targets:'
1152         @echo  '  all             - Build all targets marked with [*]'
1153         @echo  '* vmlinux         - Build the bare kernel'
1154         @echo  '* modules         - Build all modules'
1155         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1156         @echo  '  dir/            - Build all files in dir and below'
1157         @echo  '  dir/file.[ois]  - Build specified target only'
1158         @echo  '  dir/file.ko     - Build module including final link'
1159         @echo  '  rpm             - Build a kernel as an RPM package'
1160         @echo  '  tags/TAGS       - Generate tags file for editors'
1161         @echo  '  cscope          - Generate cscope index'
1162         @echo  '  kernelrelease   - Output the release version string'
1163         @echo  '  kernelversion   - Output the version stored in Makefile'
1164         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1165          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1166          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1167          fi
1168         @echo  ''
1169         @echo  'Static analysers'
1170         @echo  '  checkstack      - Generate a list of stack hogs'
1171         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1172         @echo  '  export_report   - List the usages of all exported symbols'
1173         @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1174          echo  '  headers_check   - Sanity check on exported headers'; \
1175          fi
1176         @echo  ''
1177         @echo  'Kernel packaging:'
1178         @$(MAKE) $(build)=$(package-dir) help
1179         @echo  ''
1180         @echo  'Documentation targets:'
1181         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1182         @echo  ''
1183         @echo  'Architecture specific targets ($(ARCH)):'
1184         @$(if $(archhelp),$(archhelp),\
1185                 echo '  No architecture specific help defined for $(ARCH)')
1186         @echo  ''
1187         @$(if $(boards), \
1188                 $(foreach b, $(boards), \
1189                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1190                 echo '')
1191
1192         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1193         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1194         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1195         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1196         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1197         @echo  ''
1198         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1199         @echo  'For further info see the ./README file'
1200
1201
1202 # Documentation targets
1203 # ---------------------------------------------------------------------------
1204 %docs: scripts_basic FORCE
1205         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1206
1207 else # KBUILD_EXTMOD
1208
1209 ###
1210 # External module support.
1211 # When building external modules the kernel used as basis is considered
1212 # read-only, and no consistency checks are made and the make
1213 # system is not used on the basis kernel. If updates are required
1214 # in the basis kernel ordinary make commands (without M=...) must
1215 # be used.
1216 #
1217 # The following are the only valid targets when building external
1218 # modules.
1219 # make M=dir clean     Delete all automatically generated files
1220 # make M=dir modules   Make all modules in specified dir
1221 # make M=dir           Same as 'make M=dir modules'
1222 # make M=dir modules_install
1223 #                      Install the modules built in the module directory
1224 #                      Assumes install directory is already created
1225
1226 # We are always building modules
1227 KBUILD_MODULES := 1
1228 PHONY += crmodverdir
1229 crmodverdir:
1230         $(cmd_crmodverdir)
1231
1232 PHONY += $(objtree)/Module.symvers
1233 $(objtree)/Module.symvers:
1234         @test -e $(objtree)/Module.symvers || ( \
1235         echo; \
1236         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1237         echo "           is missing; modules will have no dependencies and modversions."; \
1238         echo )
1239
1240 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1241 PHONY += $(module-dirs) modules
1242 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1243         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1244
1245 modules: $(module-dirs)
1246         @echo '  Building modules, stage 2.';
1247         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1248
1249 PHONY += modules_install
1250 modules_install: _emodinst_ _emodinst_post
1251
1252 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1253 PHONY += _emodinst_
1254 _emodinst_:
1255         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1256         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1257
1258 PHONY += _emodinst_post
1259 _emodinst_post: _emodinst_
1260         $(call cmd,depmod)
1261
1262 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1263
1264 PHONY += $(clean-dirs) clean
1265 $(clean-dirs):
1266         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1267
1268 clean:  rm-dirs := $(MODVERDIR)
1269 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1270 clean: $(clean-dirs)
1271         $(call cmd,rmdirs)
1272         $(call cmd,rmfiles)
1273         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1274                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1275                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1276                 -type f -print | xargs rm -f
1277
1278 help:
1279         @echo  '  Building external modules.'
1280         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1281         @echo  ''
1282         @echo  '  modules         - default target, build the module(s)'
1283         @echo  '  modules_install - install the module'
1284         @echo  '  clean           - remove generated files in module directory only'
1285         @echo  ''
1286
1287 # Dummies...
1288 PHONY += prepare scripts
1289 prepare: ;
1290 scripts: ;
1291 endif # KBUILD_EXTMOD
1292
1293 # Generate tags for editors
1294 # ---------------------------------------------------------------------------
1295
1296 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1297 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1298 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1299
1300 ifeq ($(src),$(obj))
1301 __srctree =
1302 else
1303 __srctree = $(srctree)/
1304 endif
1305
1306 ifeq ($(ALLSOURCE_ARCHS),)
1307 ifeq ($(ARCH),um)
1308 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1309 else
1310 ALLINCLUDE_ARCHS := $(SRCARCH)
1311 endif
1312 else
1313 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1314 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1315 endif
1316
1317 # Take care of arch/x86
1318 ifeq ($(ARCH), $(SRCARCH))
1319 ALLSOURCE_ARCHS := $(ARCH)
1320 else
1321 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1322 endif
1323
1324 define find-sources
1325         ( for arch in $(ALLSOURCE_ARCHS) ; do \
1326                find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1327                     -name $1 -print; \
1328           done ; \
1329           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1330                -name $1 -print; \
1331           find $(__srctree)include $(RCS_FIND_IGNORE) \
1332                \( -name config -o -name 'asm-*' \) -prune \
1333                -o -name $1 -print; \
1334           for arch in $(ALLINCLUDE_ARCHS) ; do \
1335                find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1336                     -name $1 -print; \
1337           done ; \
1338           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1339                -name $1 -print; \
1340           find $(__srctree) $(RCS_FIND_IGNORE) \
1341                \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1342                -name $1 -print; \
1343           )
1344 endef
1345
1346 define all-sources
1347         $(call find-sources,'*.[chS]')
1348 endef
1349 define all-kconfigs
1350         $(call find-sources,'Kconfig*')
1351 endef
1352 define all-defconfigs
1353         $(call find-sources,'defconfig')
1354 endef
1355
1356 define xtags
1357         if $1 --version 2>&1 | grep -iq exuberant; then \
1358             $(all-sources) | xargs $1 -a \
1359                 -I __initdata,__exitdata,__acquires,__releases \
1360                 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1361                 --extra=+f --c-kinds=+px \
1362                 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1363             $(all-kconfigs) | xargs $1 -a \
1364                 --langdef=kconfig \
1365                 --language-force=kconfig \
1366                 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1367             $(all-defconfigs) | xargs -r $1 -a \
1368                 --langdef=dotconfig \
1369                 --language-force=dotconfig \
1370                 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1371         elif $1 --version 2>&1 | grep -iq emacs; then \
1372             $(all-sources) | xargs $1 -a; \
1373             $(all-kconfigs) | xargs $1 -a \
1374                 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1375             $(all-defconfigs) | xargs -r $1 -a \
1376                 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1377         else \
1378             $(all-sources) | xargs $1 -a; \
1379         fi
1380 endef
1381
1382 quiet_cmd_cscope-file = FILELST cscope.files
1383       cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1384
1385 quiet_cmd_cscope = MAKE    cscope.out
1386       cmd_cscope = cscope -b
1387
1388 cscope: FORCE
1389         $(call cmd,cscope-file)
1390         $(call cmd,cscope)
1391
1392 quiet_cmd_TAGS = MAKE   $@
1393 define cmd_TAGS
1394         rm -f $@; \
1395         $(call xtags,etags)
1396 endef
1397
1398 TAGS: FORCE
1399         $(call cmd,TAGS)
1400
1401 quiet_cmd_tags = MAKE   $@
1402 define cmd_tags
1403         rm -f $@; \
1404         $(call xtags,ctags)
1405 endef
1406
1407 tags: FORCE
1408         $(call cmd,tags)
1409
1410
1411 # Scripts to check various things for consistency
1412 # ---------------------------------------------------------------------------
1413
1414 includecheck:
1415         find * $(RCS_FIND_IGNORE) \
1416                 -name '*.[hcS]' -type f -print | sort \
1417                 | xargs $(PERL) -w scripts/checkincludes.pl
1418
1419 versioncheck:
1420         find * $(RCS_FIND_IGNORE) \
1421                 -name '*.[hcS]' -type f -print | sort \
1422                 | xargs $(PERL) -w scripts/checkversion.pl
1423
1424 namespacecheck:
1425         $(PERL) $(srctree)/scripts/namespace.pl
1426
1427 export_report:
1428         $(PERL) $(srctree)/scripts/export_report.pl
1429
1430 endif #ifeq ($(config-targets),1)
1431 endif #ifeq ($(mixed-targets),1)
1432
1433 PHONY += checkstack kernelrelease kernelversion
1434
1435 # UML needs a little special treatment here.  It wants to use the host
1436 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1437 # else wants $(ARCH), including people doing cross-builds, which means
1438 # that $(SUBARCH) doesn't work here.
1439 ifeq ($(ARCH), um)
1440 CHECKSTACK_ARCH := $(SUBARCH)
1441 else
1442 CHECKSTACK_ARCH := $(ARCH)
1443 endif
1444 checkstack:
1445         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1446         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1447
1448 kernelrelease:
1449         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1450         $(error kernelrelease not valid - run 'make prepare' to update it))
1451 kernelversion:
1452         @echo $(KERNELVERSION)
1453
1454 # Single targets
1455 # ---------------------------------------------------------------------------
1456 # Single targets are compatible with:
1457 # - build whith mixed source and output
1458 # - build with separate output dir 'make O=...'
1459 # - external modules
1460 #
1461 #  target-dir => where to store outputfile
1462 #  build-dir  => directory in kernel source tree to use
1463
1464 ifeq ($(KBUILD_EXTMOD),)
1465         build-dir  = $(patsubst %/,%,$(dir $@))
1466         target-dir = $(dir $@)
1467 else
1468         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1469         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1470         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1471 endif
1472
1473 %.s: %.c prepare scripts FORCE
1474         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1475 %.i: %.c prepare scripts FORCE
1476         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1477 %.o: %.c prepare scripts FORCE
1478         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479 %.lst: %.c prepare scripts FORCE
1480         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481 %.s: %.S prepare scripts FORCE
1482         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483 %.o: %.S prepare scripts FORCE
1484         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1485 %.symtypes: %.c prepare scripts FORCE
1486         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1487
1488 # Modules
1489 / %/: prepare scripts FORCE
1490         $(cmd_crmodverdir)
1491         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1492         $(build)=$(build-dir)
1493 %.ko: prepare scripts FORCE
1494         $(cmd_crmodverdir)
1495         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1496         $(build)=$(build-dir) $(@:.ko=.o)
1497         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1498
1499 # FIXME Should go into a make.lib or something
1500 # ===========================================================================
1501
1502 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1503       cmd_rmdirs = rm -rf $(rm-dirs)
1504
1505 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1506       cmd_rmfiles = rm -f $(rm-files)
1507
1508 # Run depmod only is we have System.map and depmod is executable
1509 # and we build for the host arch
1510 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1511       cmd_depmod = \
1512         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1513                 $(DEPMOD) -ae -F System.map                                     \
1514                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1515                 $(KERNELRELEASE);                                               \
1516         fi
1517
1518 # Create temporary dir for module support files
1519 # clean it up only when building all modules
1520 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1521                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1522
1523 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1524           $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1525           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1526
1527 quiet_cmd_as_o_S = AS      $@
1528 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1529
1530 # read all saved command lines
1531
1532 targets := $(wildcard $(sort $(targets)))
1533 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1534
1535 ifneq ($(cmd_files),)
1536   $(cmd_files): ;       # Do not try to update included dependency files
1537   include $(cmd_files)
1538 endif
1539
1540 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1541 # Usage:
1542 # $(Q)$(MAKE) $(clean)=dir
1543 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1544
1545 endif   # skip-makefile
1546
1547 PHONY += FORCE
1548 FORCE:
1549
1550 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1551 Makefile: ;
1552
1553 # Declare the contents of the .PHONY variable as phony.  We keep that
1554 # information in a variable se we can use it in if_changed and friends.
1555 .PHONY: $(PHONY)