Makefile

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