Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 33
   4 EXTRAVERSION = -rc6
   5 NAME = Man-Eating Seals of Antiquity
   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 avoids hard-to-debug behaviour);
  16 # o  print "Entering directory ...";
  17 MAKEFLAGS += -rR --no-print-directory
  18
  19 # Avoid funny character set dependencies
  20 unexport LC_ALL
  21 LC_COLLATE=C
  22 LC_NUMERIC=C
  23 export LC_COLLATE LC_NUMERIC
  24
  25 # We are using a recursive build, so we need to do a little thinking
  26 # to get the ordering right.
  27 #
  28 # Most importantly: sub-Makefiles should only ever modify files in
  29 # their own directory. If in some directory we have a dependency on
  30 # a file in another dir (which doesn't happen often, but it's often
  31 # unavoidable when linking the built-in.o targets which finally
  32 # turn into vmlinux), we will call a sub make in that other dir, and
  33 # after that we are sure that everything which is in that other dir
  34 # is now up to date.
  35 #
  36 # The only cases where we need to modify files which have global
  37 # effects are thus separated out and done before the recursive
  38 # descending is started. They are now explicitly listed as the
  39 # prepare rule.
  40
  41 # To put more focus on warnings, be less verbose as default
  42 # Use 'make V=1' to see the full commands
  43
  44 ifeq ("$(origin V)", "command line")
  45   KBUILD_VERBOSE = $(V)
  46 endif
  47 ifndef KBUILD_VERBOSE
  48   KBUILD_VERBOSE = 0
  49 endif
  50
  51 # Call a source code checker (by default, "sparse") as part of the
  52 # C compilation.
  53 #
  54 # Use 'make C=1' to enable checking of only re-compiled files.
  55 # Use 'make C=2' to enable checking of *all* source files, regardless
  56 # of whether they are re-compiled or not.
  57 #
  58 # See the file "Documentation/sparse.txt" for more details, including
  59 # where to get the "sparse" utility.
  60
  61 ifeq ("$(origin C)", "command line")
  62   KBUILD_CHECKSRC = $(C)
  63 endif
  64 ifndef KBUILD_CHECKSRC
  65   KBUILD_CHECKSRC = 0
  66 endif
  67
  68 # Use make M=dir to specify directory of external module to build
  69 # Old syntax make ... SUBDIRS=$PWD is still supported
  70 # Setting the environment variable KBUILD_EXTMOD take precedence
  71 ifdef SUBDIRS
  72   KBUILD_EXTMOD ?= $(SUBDIRS)
  73 endif
  74
  75 ifeq ("$(origin M)", "command line")
  76   KBUILD_EXTMOD := $(M)
  77 endif
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(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 ifeq ("$(origin O)", "command line")
 102   KBUILD_OUTPUT := $(O)
 103 endif
 104
 105 # That's our default target when none is given on the command line
 106 PHONY := _all
 107 _all:
 108
 109 # Cancel implicit rules on top Makefile
 110 $(CURDIR)/Makefile Makefile: ;
 111
 112 ifneq ($(KBUILD_OUTPUT),)
 113 # Invoke a second make in the output directory, passing relevant variables
 114 # check that the output directory actually exists
 115 saved-output := $(KBUILD_OUTPUT)
 116 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 117 $(if $(KBUILD_OUTPUT),, \
 118      $(error output directory "$(saved-output)" does not exist))
 119
 120 PHONY += $(MAKECMDGOALS) sub-make
 121
 122 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 123         $(Q)@:
 124
 125 sub-make: FORCE
 126         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 127         KBUILD_SRC=$(CURDIR) \
 128         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 129         $(filter-out _all sub-make,$(MAKECMDGOALS))
 130
 131 # Leave processing to above invocation of make
 132 skip-makefile := 1
 133 endif # ifneq ($(KBUILD_OUTPUT),)
 134 endif # ifeq ($(KBUILD_SRC),)
 135
 136 # We process the rest of the Makefile if this is the final invocation of make
 137 ifeq ($(skip-makefile),)
 138
 139 # If building an external module we do not care about the all: rule
 140 # but instead _all depend on modules
 141 PHONY += all
 142 ifeq ($(KBUILD_EXTMOD),)
 143 _all: all
 144 else
 145 _all: modules
 146 endif
 147
 148 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 149 objtree         := $(CURDIR)
 150 src             := $(srctree)
 151 obj             := $(objtree)
 152
 153 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 154
 155 export srctree objtree VPATH
 156
 157
 158 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 159 # first, and if a usermode build is happening, the "ARCH=um" on the command
 160 # line overrides the setting of ARCH below.  If a native build is happening,
 161 # then ARCH is assigned, getting whatever value it gets normally, and
 162 # SUBARCH is subsequently ignored.
 163
 164 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 165                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 166                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 167                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 168                                   -e s/sh[234].*/sh/ )
 169
 170 # Cross compiling and selecting different set of gcc/bin-utils
 171 # ---------------------------------------------------------------------------
 172 #
 173 # When performing cross compilation for other architectures ARCH shall be set
 174 # to the target architecture. (See arch/* for the possibilities).
 175 # ARCH can be set during invocation of make:
 176 # make ARCH=ia64
 177 # Another way is to have ARCH set in the environment.
 178 # The default ARCH is the host where make is executed.
 179
 180 # CROSS_COMPILE specify the prefix used for all executables used
 181 # during compilation. Only gcc and related bin-utils executables
 182 # are prefixed with $(CROSS_COMPILE).
 183 # CROSS_COMPILE can be set on the command line
 184 # make CROSS_COMPILE=ia64-linux-
 185 # Alternatively CROSS_COMPILE can be set in the environment.
 186 # A third alternative is to store a setting in .config so that plain
 187 # "make" in the configured kernel build directory always uses that.
 188 # Default value for CROSS_COMPILE is not to prefix executables
 189 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 190 export KBUILD_BUILDHOST := $(SUBARCH)
 191 ARCH            ?= $(SUBARCH)
 192 CROSS_COMPILE   ?=
 193 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 194
 195 # Architecture as present in compile.h
 196 UTS_MACHINE     := $(ARCH)
 197 SRCARCH         := $(ARCH)
 198
 199 # Additional ARCH settings for x86
 200 ifeq ($(ARCH),i386)
 201         SRCARCH := x86
 202 endif
 203 ifeq ($(ARCH),x86_64)
 204         SRCARCH := x86
 205 endif
 206
 207 # Additional ARCH settings for sparc
 208 ifeq ($(ARCH),sparc64)
 209        SRCARCH := sparc
 210 endif
 211
 212 # Additional ARCH settings for sh
 213 ifeq ($(ARCH),sh64)
 214        SRCARCH := sh
 215 endif
 216
 217 # Where to locate arch specific headers
 218 hdr-arch  := $(SRCARCH)
 219
 220 ifeq ($(ARCH),m68knommu)
 221        hdr-arch  := m68k
 222 endif
 223
 224 KCONFIG_CONFIG  ?= .config
 225
 226 # SHELL used by kbuild
 227 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 228           else if [ -x /bin/bash ]; then echo /bin/bash; \
 229           else echo sh; fi ; fi)
 230
 231 HOSTCC       = gcc
 232 HOSTCXX      = g++
 233 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 234 HOSTCXXFLAGS = -O2
 235
 236 # Decide whether to build built-in, modular, or both.
 237 # Normally, just do built-in.
 238
 239 KBUILD_MODULES :=
 240 KBUILD_BUILTIN := 1
 241
 242 #       If we have only "make modules", don't compile built-in objects.
 243 #       When we're building modules with modversions, we need to consider
 244 #       the built-in objects during the descend as well, in order to
 245 #       make sure the checksums are up to date before we record them.
 246
 247 ifeq ($(MAKECMDGOALS),modules)
 248   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 249 endif
 250
 251 #       If we have "make <whatever> modules", compile modules
 252 #       in addition to whatever we do anyway.
 253 #       Just "make" or "make all" shall build modules as well
 254
 255 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 256   KBUILD_MODULES := 1
 257 endif
 258
 259 ifeq ($(MAKECMDGOALS),)
 260   KBUILD_MODULES := 1
 261 endif
 262
 263 export KBUILD_MODULES KBUILD_BUILTIN
 264 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 265
 266 # Beautify output
 267 # ---------------------------------------------------------------------------
 268 #
 269 # Normally, we echo the whole command before executing it. By making
 270 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 271 # $(quiet) to choose other forms of output instead, e.g.
 272 #
 273 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 274 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 275 #
 276 # If $(quiet) is empty, the whole command will be printed.
 277 # If it is set to "quiet_", only the short version will be printed.
 278 # If it is set to "silent_", nothing will be printed at all, since
 279 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 280 #
 281 # A simple variant is to prefix commands with $(Q) - that's useful
 282 # for commands that shall be hidden in non-verbose mode.
 283 #
 284 #       $(Q)ln $@ :<
 285 #
 286 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 287 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 288
 289 ifeq ($(KBUILD_VERBOSE),1)
 290   quiet =
 291   Q =
 292 else
 293   quiet=quiet_
 294   Q = @
 295 endif
 296
 297 # If the user is running make -s (silent mode), suppress echoing of
 298 # commands
 299
 300 ifneq ($(findstring s,$(MAKEFLAGS)),)
 301   quiet=silent_
 302 endif
 303
 304 export quiet Q KBUILD_VERBOSE
 305
 306
 307 # Look for make include files relative to root of kernel src
 308 MAKEFLAGS += --include-dir=$(srctree)
 309
 310 # We need some generic definitions (do not try to remake the file).
 311 $(srctree)/scripts/Kbuild.include: ;
 312 include $(srctree)/scripts/Kbuild.include
 313
 314 # Make variables (CC, etc...)
 315
 316 AS              = $(CROSS_COMPILE)as
 317 LD              = $(CROSS_COMPILE)ld
 318 CC              = $(CROSS_COMPILE)gcc
 319 CPP             = $(CC) -E
 320 AR              = $(CROSS_COMPILE)ar
 321 NM              = $(CROSS_COMPILE)nm
 322 STRIP           = $(CROSS_COMPILE)strip
 323 OBJCOPY         = $(CROSS_COMPILE)objcopy
 324 OBJDUMP         = $(CROSS_COMPILE)objdump
 325 AWK             = awk
 326 GENKSYMS        = scripts/genksyms/genksyms
 327 INSTALLKERNEL  := installkernel
 328 DEPMOD          = /sbin/depmod
 329 KALLSYMS        = scripts/kallsyms
 330 PERL            = perl
 331 CHECK           = sparse
 332
 333 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 334                   -Wbitwise -Wno-return-void $(CF)
 335 MODFLAGS        = -DMODULE
 336 CFLAGS_MODULE   = $(MODFLAGS)
 337 AFLAGS_MODULE   = $(MODFLAGS)
 338 LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 339 CFLAGS_KERNEL   =
 340 AFLAGS_KERNEL   =
 341 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 342
 343
 344 # Use LINUXINCLUDE when you must reference the include/ directory.
 345 # Needed to be compatible with the O= option
 346 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 347                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 348                    -include include/generated/autoconf.h
 349
 350 KBUILD_CPPFLAGS := -D__KERNEL__
 351
 352 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 353                    -fno-strict-aliasing -fno-common \
 354                    -Werror-implicit-function-declaration \
 355                    -Wno-format-security \
 356                    -fno-delete-null-pointer-checks
 357 KBUILD_AFLAGS   := -D__ASSEMBLY__
 358
 359 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 360 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 361 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 362
 363 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 364 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 365 export CPP AR NM STRIP OBJCOPY OBJDUMP
 366 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 367 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 368
 369 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 370 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 371 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 372
 373 # When compiling out-of-tree modules, put MODVERDIR in the module
 374 # tree rather than in the kernel tree. The kernel tree might
 375 # even be read-only.
 376 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 377
 378 # Files to ignore in find ... statements
 379
 380 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
 381 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 382
 383 # ===========================================================================
 384 # Rules shared between *config targets and build targets
 385
 386 # Basic helpers built in scripts/
 387 PHONY += scripts_basic
 388 scripts_basic:
 389         $(Q)$(MAKE) $(build)=scripts/basic
 390         $(Q)rm -f .tmp_quiet_recordmcount
 391
 392 # To avoid any implicit rule to kick in, define an empty command.
 393 scripts/basic/%: scripts_basic ;
 394
 395 PHONY += outputmakefile
 396 # outputmakefile generates a Makefile in the output directory, if using a
 397 # separate output directory. This allows convenient use of make in the
 398 # output directory.
 399 outputmakefile:
 400 ifneq ($(KBUILD_SRC),)
 401         $(Q)ln -fsn $(srctree) source
 402         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 403             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 404 endif
 405
 406 # To make sure we do not include .config for any of the *config targets
 407 # catch them early, and hand them over to scripts/kconfig/Makefile
 408 # It is allowed to specify more targets when calling make, including
 409 # mixing *config targets and build targets.
 410 # For example 'make oldconfig all'.
 411 # Detect when mixed targets is specified, and make a second invocation
 412 # of make so .config is not included in this case either (for *config).
 413
 414 no-dot-config-targets := clean mrproper distclean \
 415                          cscope TAGS tags help %docs check% \
 416                          include/linux/version.h headers_% \
 417                          kernelrelease kernelversion
 418
 419 config-targets := 0
 420 mixed-targets  := 0
 421 dot-config     := 1
 422
 423 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 424         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 425                 dot-config := 0
 426         endif
 427 endif
 428
 429 ifeq ($(KBUILD_EXTMOD),)
 430         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 431                 config-targets := 1
 432                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 433                         mixed-targets := 1
 434                 endif
 435         endif
 436 endif
 437
 438 ifeq ($(mixed-targets),1)
 439 # ===========================================================================
 440 # We're called with mixed targets (*config and build targets).
 441 # Handle them one by one.
 442
 443 %:: FORCE
 444         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 445
 446 else
 447 ifeq ($(config-targets),1)
 448 # ===========================================================================
 449 # *config targets only - make sure prerequisites are updated, and descend
 450 # in scripts/kconfig to make the *config target
 451
 452 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 453 # KBUILD_DEFCONFIG may point out an alternative default configuration
 454 # used for 'make defconfig'
 455 include $(srctree)/arch/$(SRCARCH)/Makefile
 456 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 457
 458 config: scripts_basic outputmakefile FORCE
 459         $(Q)mkdir -p include/linux include/config
 460         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 461
 462 %config: scripts_basic outputmakefile FORCE
 463         $(Q)mkdir -p include/linux include/config
 464         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 465
 466 else
 467 # ===========================================================================
 468 # Build targets only - this includes vmlinux, arch specific targets, clean
 469 # targets and others. In general all targets except *config targets.
 470
 471 ifeq ($(KBUILD_EXTMOD),)
 472 # Additional helpers built in scripts/
 473 # Carefully list dependencies so we do not try to build scripts twice
 474 # in parallel
 475 PHONY += scripts
 476 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 477         $(Q)$(MAKE) $(build)=$(@)
 478
 479 # Objects we will link into vmlinux / subdirs we need to visit
 480 init-y          := init/
 481 drivers-y       := drivers/ sound/ firmware/
 482 net-y           := net/
 483 libs-y          := lib/
 484 core-y          := usr/
 485 endif # KBUILD_EXTMOD
 486
 487 ifeq ($(dot-config),1)
 488 # Read in config
 489 -include include/config/auto.conf
 490
 491 ifeq ($(KBUILD_EXTMOD),)
 492 # Read in dependencies to all Kconfig* files, make sure to run
 493 # oldconfig if changes are detected.
 494 -include include/config/auto.conf.cmd
 495
 496 # To avoid any implicit rule to kick in, define an empty command
 497 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 498
 499 # If .config is newer than include/config/auto.conf, someone tinkered
 500 # with it and forgot to run make oldconfig.
 501 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 502 # we execute the config step to be sure to catch updated Kconfig files
 503 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 504         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 505 else
 506 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 507 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 508 PHONY += include/config/auto.conf
 509
 510 include/config/auto.conf:
 511         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 512         echo;                                                           \
 513         echo "  ERROR: Kernel configuration is invalid.";               \
 514         echo "         include/generated/autoconf.h or $@ are missing.";\
 515         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 516         echo;                                                           \
 517         /bin/false)
 518
 519 endif # KBUILD_EXTMOD
 520
 521 else
 522 # Dummy target needed, because used as prerequisite
 523 include/config/auto.conf: ;
 524 endif # $(dot-config)
 525
 526 # The all: target is the default when no target is given on the
 527 # command line.
 528 # This allow a user to issue only 'make' to build a kernel including modules
 529 # Defaults vmlinux but it is usually overridden in the arch makefile
 530 all: vmlinux
 531
 532 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 533 KBUILD_CFLAGS   += -Os
 534 else
 535 KBUILD_CFLAGS   += -O2
 536 endif
 537
 538 include $(srctree)/arch/$(SRCARCH)/Makefile
 539
 540 ifneq ($(CONFIG_FRAME_WARN),0)
 541 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 542 endif
 543
 544 # Force gcc to behave correct even for buggy distributions
 545 ifndef CONFIG_CC_STACKPROTECTOR
 546 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 547 endif
 548
 549 ifdef CONFIG_FRAME_POINTER
 550 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 551 else
 552 KBUILD_CFLAGS   += -fomit-frame-pointer
 553 endif
 554
 555 ifdef CONFIG_DEBUG_INFO
 556 KBUILD_CFLAGS   += -g
 557 KBUILD_AFLAGS   += -gdwarf-2
 558 endif
 559
 560 ifdef CONFIG_FUNCTION_TRACER
 561 KBUILD_CFLAGS   += -pg
 562 endif
 563
 564 # We trigger additional mismatches with less inlining
 565 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 566 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 567 endif
 568
 569 # arch Makefile may override CC so keep this after arch Makefile is included
 570 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 571 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 572
 573 # warn about C99 declaration after statement
 574 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 575
 576 # disable pointer signed / unsigned warnings in gcc 4.0
 577 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 578
 579 # disable invalid "can't wrap" optimizations for signed / pointers
 580 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 581
 582 # conserve stack if available
 583 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 584
 585 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 586 # But warn user when we do so
 587 warn-assign = \
 588 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 589
 590 ifneq ($(KCPPFLAGS),)
 591         $(call warn-assign,CPPFLAGS)
 592         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 593 endif
 594 ifneq ($(KAFLAGS),)
 595         $(call warn-assign,AFLAGS)
 596         KBUILD_AFLAGS += $(KAFLAGS)
 597 endif
 598 ifneq ($(KCFLAGS),)
 599         $(call warn-assign,CFLAGS)
 600         KBUILD_CFLAGS += $(KCFLAGS)
 601 endif
 602
 603 # Use --build-id when available.
 604 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 605                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 606 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 607 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 608
 609 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 610 LDFLAGS_vmlinux += $(call ld-option, -X,)
 611 endif
 612
 613 # Default kernel image to build when no specific target is given.
 614 # KBUILD_IMAGE may be overruled on the command line or
 615 # set in the environment
 616 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 617 # this default value
 618 export KBUILD_IMAGE ?= vmlinux
 619
 620 #
 621 # INSTALL_PATH specifies where to place the updated kernel and system map
 622 # images. Default is /boot, but you can set it to other values
 623 export  INSTALL_PATH ?= /boot
 624
 625 #
 626 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 627 # relocations required by build roots.  This is not defined in the
 628 # makefile but the argument can be passed to make if needed.
 629 #
 630
 631 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 632 export MODLIB
 633
 634 #
 635 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 636 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 637 #  the default option --strip-debug will be used.  Otherwise,
 638 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 639
 640 ifdef INSTALL_MOD_STRIP
 641 ifeq ($(INSTALL_MOD_STRIP),1)
 642 mod_strip_cmd = $(STRIP) --strip-debug
 643 else
 644 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 645 endif # INSTALL_MOD_STRIP=1
 646 else
 647 mod_strip_cmd = true
 648 endif # INSTALL_MOD_STRIP
 649 export mod_strip_cmd
 650
 651
 652 ifeq ($(KBUILD_EXTMOD),)
 653 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 654
 655 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 656                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 657                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 658
 659 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 660                      $(init-n) $(init-) \
 661                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 662                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 663
 664 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 665 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 666 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 667 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 668 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 669 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 670 libs-y          := $(libs-y1) $(libs-y2)
 671
 672 # Build vmlinux
 673 # ---------------------------------------------------------------------------
 674 # vmlinux is built from the objects selected by $(vmlinux-init) and
 675 # $(vmlinux-main). Most are built-in.o files from top-level directories
 676 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 677 # Ordering when linking is important, and $(vmlinux-init) must be first.
 678 #
 679 # vmlinux
 680 #   ^
 681 #   |
 682 #   +-< $(vmlinux-init)
 683 #   |   +--< init/version.o + more
 684 #   |
 685 #   +--< $(vmlinux-main)
 686 #   |    +--< driver/built-in.o mm/built-in.o + more
 687 #   |
 688 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 689 #
 690 # vmlinux version (uname -v) cannot be updated during normal
 691 # descending-into-subdirs phase since we do not yet know if we need to
 692 # update vmlinux.
 693 # Therefore this step is delayed until just before final link of vmlinux -
 694 # except in the kallsyms case where it is done just before adding the
 695 # symbols to the kernel.
 696 #
 697 # System.map is generated to document addresses of all kernel symbols
 698
 699 vmlinux-init := $(head-y) $(init-y)
 700 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 701 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 702 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 703 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 704
 705 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 706 # May be overridden by arch/$(ARCH)/Makefile
 707 quiet_cmd_vmlinux__ ?= LD      $@
 708       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 709       -T $(vmlinux-lds) $(vmlinux-init)                          \
 710       --start-group $(vmlinux-main) --end-group                  \
 711       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 712
 713 # Generate new vmlinux version
 714 quiet_cmd_vmlinux_version = GEN     .version
 715       cmd_vmlinux_version = set -e;                     \
 716         if [ ! -r .version ]; then                      \
 717           rm -f .version;                               \
 718           echo 1 >.version;                             \
 719         else                                            \
 720           mv .version .old_version;                     \
 721           expr 0$$(cat .old_version) + 1 >.version;     \
 722         fi;                                             \
 723         $(MAKE) $(build)=init
 724
 725 # Generate System.map
 726 quiet_cmd_sysmap = SYSMAP
 727       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 728
 729 # Link of vmlinux
 730 # If CONFIG_KALLSYMS is set .version is already updated
 731 # Generate System.map and verify that the content is consistent
 732 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 733 # First command is ':' to allow us to use + in front of the rule
 734 define rule_vmlinux__
 735         :
 736         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 737
 738         $(call cmd,vmlinux__)
 739         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 740
 741         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 742           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 743         $(cmd_sysmap) $@ System.map;                                         \
 744         if [ $$? -ne 0 ]; then                                               \
 745                 rm -f $@;                                                    \
 746                 /bin/false;                                                  \
 747         fi;
 748         $(verify_kallsyms)
 749 endef
 750
 751
 752 ifdef CONFIG_KALLSYMS
 753 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 754 # It's a three stage process:
 755 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 756 #   empty
 757 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 758 #   the right size - vmlinux version (uname -v) is updated during this step
 759 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 760 #   but due to the added section, some addresses have shifted.
 761 #   From here, we generate a correct .tmp_kallsyms2.o
 762 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 763 # o Verify that the System.map from vmlinux matches the map from
 764 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 765 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 766 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 767 #   temporary bypass to allow the kernel to be built while the
 768 #   maintainers work out what went wrong with kallsyms.
 769
 770 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 771 last_kallsyms := 3
 772 else
 773 last_kallsyms := 2
 774 endif
 775
 776 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 777
 778 define verify_kallsyms
 779         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 780           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 781           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 782         $(Q)cmp -s System.map .tmp_System.map ||                             \
 783                 (echo Inconsistent kallsyms data;                            \
 784                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 785                  rm .tmp_kallsyms* ; /bin/false )
 786 endef
 787
 788 # Update vmlinux version before link
 789 # Use + in front of this rule to silent warning about make -j1
 790 # First command is ':' to allow us to use + in front of this rule
 791 cmd_ksym_ld = $(cmd_vmlinux__)
 792 define rule_ksym_ld
 793         :
 794         +$(call cmd,vmlinux_version)
 795         $(call cmd,vmlinux__)
 796         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 797 endef
 798
 799 # Generate .S file with all kernel symbols
 800 quiet_cmd_kallsyms = KSYM    $@
 801       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 802                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 803
 804 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 805         $(call if_changed_dep,as_o_S)
 806
 807 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 808         $(call cmd,kallsyms)
 809
 810 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 811 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 812         $(call if_changed_rule,ksym_ld)
 813
 814 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 815         $(call if_changed,vmlinux__)
 816
 817 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 818         $(call if_changed,vmlinux__)
 819
 820 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 821 $(KALLSYMS): scripts ;
 822
 823 # Generate some data for debugging strange kallsyms problems
 824 debug_kallsyms: .tmp_map$(last_kallsyms)
 825
 826 .tmp_map%: .tmp_vmlinux% FORCE
 827         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 828
 829 .tmp_map3: .tmp_map2
 830
 831 .tmp_map2: .tmp_map1
 832
 833 endif # ifdef CONFIG_KALLSYMS
 834
 835 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 836 # relevant sections renamed as per the linker script.
 837 quiet_cmd_vmlinux-modpost = LD      $@
 838       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 839          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 840          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 841 define rule_vmlinux-modpost
 842         :
 843         +$(call cmd,vmlinux-modpost)
 844         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 845         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 846 endef
 847
 848 # vmlinux image - including updated kernel symbols
 849 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 850 ifdef CONFIG_HEADERS_CHECK
 851         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 852 endif
 853 ifdef CONFIG_SAMPLES
 854         $(Q)$(MAKE) $(build)=samples
 855 endif
 856 ifdef CONFIG_BUILD_DOCSRC
 857         $(Q)$(MAKE) $(build)=Documentation
 858 endif
 859         $(call vmlinux-modpost)
 860         $(call if_changed_rule,vmlinux__)
 861         $(Q)rm -f .old_version
 862
 863 # build vmlinux.o first to catch section mismatch errors early
 864 ifdef CONFIG_KALLSYMS
 865 .tmp_vmlinux1: vmlinux.o
 866 endif
 867
 868 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 869 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 870         $(call if_changed_rule,vmlinux-modpost)
 871
 872 # The actual objects are generated when descending,
 873 # make sure no implicit rule kicks in
 874 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 875
 876 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 877 # Preset locale variables to speed up the build process. Limit locale
 878 # tweaks to this spot to avoid wrong language settings when running
 879 # make menuconfig etc.
 880 # Error messages still appears in the original language
 881
 882 PHONY += $(vmlinux-dirs)
 883 $(vmlinux-dirs): prepare scripts
 884         $(Q)$(MAKE) $(build)=$@
 885
 886 # Build the kernel release string
 887 #
 888 # The KERNELRELEASE value built here is stored in the file
 889 # include/config/kernel.release, and is used when executing several
 890 # make targets, such as "make install" or "make modules_install."
 891 #
 892 # The eventual kernel release string consists of the following fields,
 893 # shown in a hierarchical format to show how smaller parts are concatenated
 894 # to form the larger and final value, with values coming from places like
 895 # the Makefile, kernel config options, make command line options and/or
 896 # SCM tag information.
 897 #
 898 #       $(KERNELVERSION)
 899 #         $(VERSION)                    eg, 2
 900 #         $(PATCHLEVEL)                 eg, 6
 901 #         $(SUBLEVEL)                   eg, 18
 902 #         $(EXTRAVERSION)               eg, -rc6
 903 #       $(localver-full)
 904 #         $(localver)
 905 #           localversion*               (files without backups, containing '~')
 906 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 907 #         $(LOCALVERSION)               (from make command line, if provided)
 908 #         $(localver-extra)
 909 #           $(scm-identifier)           (unique SCM tag, if one exists)
 910 #             ./scripts/setlocalversion (only with CONFIG_LOCALVERSION_AUTO)
 911 #             .scmversion               (only with CONFIG_LOCALVERSION_AUTO)
 912 #           +                           (only without CONFIG_LOCALVERSION_AUTO
 913 #                                        and without LOCALVERSION= and
 914 #                                        repository is at non-tagged commit)
 915 #
 916 # For kernels without CONFIG_LOCALVERSION_AUTO compiled from an SCM that has
 917 # been revised beyond a tagged commit, `+' is appended to the version string
 918 # when not overridden by using "make LOCALVERSION=".  This indicates that the
 919 # kernel is not a vanilla release version and has been modified.
 920
 921 pattern = ".*/localversion[^~]*"
 922 string  = $(shell cat /dev/null \
 923            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 924
 925 localver = $(subst $(space),, $(string) \
 926                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 927
 928 # scripts/setlocalversion is called to create a unique identifier if the source
 929 # is managed by a known SCM and the repository has been revised since the last
 930 # tagged (release) commit.  The format of the identifier is determined by the
 931 # SCM's implementation.
 932 #
 933 # .scmversion is used when generating rpm packages so we do not loose
 934 # the version information from the SCM when we do the build of the kernel
 935 # from the copied source
 936 ifeq ($(wildcard .scmversion),)
 937         scm-identifier = $(shell $(CONFIG_SHELL) \
 938                          $(srctree)/scripts/setlocalversion $(srctree))
 939 else
 940         scm-identifier = $(shell cat .scmversion 2> /dev/null)
 941 endif
 942
 943 ifdef CONFIG_LOCALVERSION_AUTO
 944         localver-extra = $(scm-identifier)
 945 else
 946         ifneq ($(scm-identifier),)
 947                 ifeq ($(LOCALVERSION),)
 948                         localver-extra = +
 949                 endif
 950         endif
 951 endif
 952
 953 localver-full = $(localver)$(LOCALVERSION)$(localver-extra)
 954
 955 # Store (new) KERNELRELASE string in include/config/kernel.release
 956 kernelrelease = $(KERNELVERSION)$(localver-full)
 957 include/config/kernel.release: include/config/auto.conf FORCE
 958         $(Q)rm -f $@
 959         $(Q)echo $(kernelrelease) > $@
 960
 961
 962 # Things we need to do before we recursively start building the kernel
 963 # or the modules are listed in "prepare".
 964 # A multi level approach is used. prepareN is processed before prepareN-1.
 965 # archprepare is used in arch Makefiles and when processed asm symlink,
 966 # version.h and scripts_basic is processed / created.
 967
 968 # Listed in dependency order
 969 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 970
 971 # prepare3 is used to check if we are building in a separate output directory,
 972 # and if so do:
 973 # 1) Check that make has not been executed in the kernel src $(srctree)
 974 prepare3: include/config/kernel.release
 975 ifneq ($(KBUILD_SRC),)
 976         @$(kecho) '  Using $(srctree) as source for kernel'
 977         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 978                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 979                 echo "  in the '$(srctree)' directory.";\
 980                 /bin/false; \
 981         fi;
 982 endif
 983
 984 # prepare2 creates a makefile if using a separate output directory
 985 prepare2: prepare3 outputmakefile
 986
 987 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 988                    include/config/auto.conf
 989         $(cmd_crmodverdir)
 990
 991 archprepare: prepare1 scripts_basic
 992
 993 prepare0: archprepare FORCE
 994         $(Q)$(MAKE) $(build)=.
 995         $(Q)$(MAKE) $(build)=. missing-syscalls
 996
 997 # All the preparing..
 998 prepare: prepare0
 999
1000 # Generate some files
1001 # ---------------------------------------------------------------------------
1002
1003 # KERNELRELEASE can change from a few different places, meaning version.h
1004 # needs to be updated, so this check is forced on all builds
1005
1006 uts_len := 64
1007 define filechk_utsrelease.h
1008         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1009           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1010           exit 1;                                                         \
1011         fi;                                                               \
1012         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1013 endef
1014
1015 define filechk_version.h
1016         (echo \#define LINUX_VERSION_CODE $(shell                             \
1017         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1018         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1019 endef
1020
1021 include/linux/version.h: $(srctree)/Makefile FORCE
1022         $(call filechk,version.h)
1023
1024 include/generated/utsrelease.h: include/config/kernel.release FORCE
1025         $(call filechk,utsrelease.h)
1026
1027 PHONY += headerdep
1028 headerdep:
1029         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1030
1031 # ---------------------------------------------------------------------------
1032
1033 PHONY += depend dep
1034 depend dep:
1035         @echo '*** Warning: make $@ is unnecessary now.'
1036
1037 # ---------------------------------------------------------------------------
1038 # Firmware install
1039 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1040 export INSTALL_FW_PATH
1041
1042 PHONY += firmware_install
1043 firmware_install: FORCE
1044         @mkdir -p $(objtree)/firmware
1045         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1046
1047 # ---------------------------------------------------------------------------
1048 # Kernel headers
1049
1050 #Default location for installed headers
1051 export INSTALL_HDR_PATH = $(objtree)/usr
1052
1053 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1054
1055 # If we do an all arch process set dst to asm-$(hdr-arch)
1056 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1057
1058 PHONY += __headers
1059 __headers: include/linux/version.h scripts_basic FORCE
1060         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1061
1062 PHONY += headers_install_all
1063 headers_install_all:
1064         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1065
1066 PHONY += headers_install
1067 headers_install: __headers
1068         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1069         $(error Headers not exportable for the $(SRCARCH) architecture))
1070         $(Q)$(MAKE) $(hdr-inst)=include
1071         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1072
1073 PHONY += headers_check_all
1074 headers_check_all: headers_install_all
1075         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1076
1077 PHONY += headers_check
1078 headers_check: headers_install
1079         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1080         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1081
1082 # ---------------------------------------------------------------------------
1083 # Modules
1084
1085 ifdef CONFIG_MODULES
1086
1087 # By default, build modules as well
1088
1089 all: modules
1090
1091 #       Build modules
1092 #
1093 #       A module can be listed more than once in obj-m resulting in
1094 #       duplicate lines in modules.order files.  Those are removed
1095 #       using awk while concatenating to the final file.
1096
1097 PHONY += modules
1098 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1099         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1100         @$(kecho) '  Building modules, stage 2.';
1101         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1102         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1103
1104 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1105         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1106
1107 %/modules.builtin: include/config/auto.conf
1108         $(Q)$(MAKE) $(modbuiltin)=$*
1109
1110
1111 # Target to prepare building external modules
1112 PHONY += modules_prepare
1113 modules_prepare: prepare scripts
1114
1115 # Target to install modules
1116 PHONY += modules_install
1117 modules_install: _modinst_ _modinst_post
1118
1119 PHONY += _modinst_
1120 _modinst_: modules.builtin
1121         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1122                 echo "Warning: you may need to install module-init-tools"; \
1123                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1124                 sleep 1; \
1125         fi
1126         @rm -rf $(MODLIB)/kernel
1127         @rm -f $(MODLIB)/source
1128         @mkdir -p $(MODLIB)/kernel
1129         @ln -s $(srctree) $(MODLIB)/source
1130         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1131                 rm -f $(MODLIB)/build ; \
1132                 ln -s $(objtree) $(MODLIB)/build ; \
1133         fi
1134         @cp -f $(objtree)/modules.order $(MODLIB)/
1135         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1136         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1137
1138 # This depmod is only for convenience to give the initial
1139 # boot a modules.dep even before / is mounted read-write.  However the
1140 # boot script depmod is the master version.
1141 PHONY += _modinst_post
1142 _modinst_post: _modinst_
1143         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1144         $(call cmd,depmod)
1145
1146 else # CONFIG_MODULES
1147
1148 # Modules not configured
1149 # ---------------------------------------------------------------------------
1150
1151 modules modules_install: FORCE
1152         @echo
1153         @echo "The present kernel configuration has modules disabled."
1154         @echo "Type 'make config' and enable loadable module support."
1155         @echo "Then build a kernel with module support enabled."
1156         @echo
1157         @exit 1
1158
1159 endif # CONFIG_MODULES
1160
1161 ###
1162 # Cleaning is done on three levels.
1163 # make clean     Delete most generated files
1164 #                Leave enough to build external modules
1165 # make mrproper  Delete the current configuration, and all generated files
1166 # make distclean Remove editor backup files, patch leftover files and the like
1167
1168 # Directories & files removed with 'make clean'
1169 CLEAN_DIRS  += $(MODVERDIR)
1170 CLEAN_FILES +=  vmlinux System.map \
1171                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1172
1173 # Directories & files removed with 'make mrproper'
1174 MRPROPER_DIRS  += include/config usr/include include/generated
1175 MRPROPER_FILES += .config .config.old .version .old_version             \
1176                   include/linux/version.h                               \
1177                   Module.symvers tags TAGS cscope*
1178
1179 # clean - Delete most, but leave enough to build external modules
1180 #
1181 clean: rm-dirs  := $(CLEAN_DIRS)
1182 clean: rm-files := $(CLEAN_FILES)
1183 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1184
1185 PHONY += $(clean-dirs) clean archclean
1186 $(clean-dirs):
1187         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1188
1189 clean: archclean $(clean-dirs)
1190         $(call cmd,rmdirs)
1191         $(call cmd,rmfiles)
1192         @find . $(RCS_FIND_IGNORE) \
1193                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1194                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1195                 -o -name '*.symtypes' -o -name 'modules.order' \
1196                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1197                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1198
1199 # mrproper - Delete all generated files, including .config
1200 #
1201 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1202 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1203 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1204
1205 PHONY += $(mrproper-dirs) mrproper archmrproper
1206 $(mrproper-dirs):
1207         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1208
1209 mrproper: clean archmrproper $(mrproper-dirs)
1210         $(call cmd,rmdirs)
1211         $(call cmd,rmfiles)
1212
1213 # distclean
1214 #
1215 PHONY += distclean
1216
1217 distclean: mrproper
1218         @find $(srctree) $(RCS_FIND_IGNORE) \
1219                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1220                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1221                 -o -name '.*.rej' -o -size 0 \
1222                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1223                 -type f -print | xargs rm -f
1224
1225
1226 # Packaging of the kernel to various formats
1227 # ---------------------------------------------------------------------------
1228 # rpm target kept for backward compatibility
1229 package-dir     := $(srctree)/scripts/package
1230
1231 %pkg: include/config/kernel.release FORCE
1232         $(Q)$(MAKE) $(build)=$(package-dir) $@
1233 rpm: include/config/kernel.release FORCE
1234         $(Q)$(MAKE) $(build)=$(package-dir) $@
1235
1236
1237 # Brief documentation of the typical targets used
1238 # ---------------------------------------------------------------------------
1239
1240 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1241 boards := $(notdir $(boards))
1242 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1243 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1244
1245 help:
1246         @echo  'Cleaning targets:'
1247         @echo  '  clean           - Remove most generated files but keep the config and'
1248         @echo  '                    enough build support to build external modules'
1249         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1250         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1251         @echo  ''
1252         @echo  'Configuration targets:'
1253         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1254         @echo  ''
1255         @echo  'Other generic targets:'
1256         @echo  '  all             - Build all targets marked with [*]'
1257         @echo  '* vmlinux         - Build the bare kernel'
1258         @echo  '* modules         - Build all modules'
1259         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1260         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1261         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1262         @echo  '  dir/            - Build all files in dir and below'
1263         @echo  '  dir/file.[oisS] - Build specified target only'
1264         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1265         @echo  '                    (requires a recent binutils and recent build (System.map))'
1266         @echo  '  dir/file.ko     - Build module including final link'
1267         @echo  '  modules_prepare - Set up for building external modules'
1268         @echo  '  tags/TAGS       - Generate tags file for editors'
1269         @echo  '  cscope          - Generate cscope index'
1270         @echo  '  kernelrelease   - Output the release version string'
1271         @echo  '  kernelversion   - Output the version stored in Makefile'
1272         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1273          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1274          echo  ''
1275         @echo  'Static analysers'
1276         @echo  '  checkstack      - Generate a list of stack hogs'
1277         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1278         @echo  '  versioncheck    - Sanity check on version.h usage'
1279         @echo  '  includecheck    - Check for duplicate included header files'
1280         @echo  '  export_report   - List the usages of all exported symbols'
1281         @echo  '  headers_check   - Sanity check on exported headers'
1282         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1283          echo  ''
1284         @echo  'Kernel packaging:'
1285         @$(MAKE) $(build)=$(package-dir) help
1286         @echo  ''
1287         @echo  'Documentation targets:'
1288         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1289         @echo  ''
1290         @echo  'Architecture specific targets ($(SRCARCH)):'
1291         @$(if $(archhelp),$(archhelp),\
1292                 echo '  No architecture specific help defined for $(SRCARCH)')
1293         @echo  ''
1294         @$(if $(boards), \
1295                 $(foreach b, $(boards), \
1296                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1297                 echo '')
1298         @$(if $(board-dirs), \
1299                 $(foreach b, $(board-dirs), \
1300                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1301                 printf "  %-16s - Show all of the above\\n" help-boards; \
1302                 echo '')
1303
1304         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1305         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1306         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1307         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1308         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1309         @echo  ''
1310         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1311         @echo  'For further info see the ./README file'
1312
1313
1314 help-board-dirs := $(addprefix help-,$(board-dirs))
1315
1316 help-boards: $(help-board-dirs)
1317
1318 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1319
1320 $(help-board-dirs): help-%:
1321         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1322         @$(if $(boards-per-dir), \
1323                 $(foreach b, $(boards-per-dir), \
1324                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1325                 echo '')
1326
1327
1328 # Documentation targets
1329 # ---------------------------------------------------------------------------
1330 %docs: scripts_basic FORCE
1331         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1332
1333 else # KBUILD_EXTMOD
1334
1335 ###
1336 # External module support.
1337 # When building external modules the kernel used as basis is considered
1338 # read-only, and no consistency checks are made and the make
1339 # system is not used on the basis kernel. If updates are required
1340 # in the basis kernel ordinary make commands (without M=...) must
1341 # be used.
1342 #
1343 # The following are the only valid targets when building external
1344 # modules.
1345 # make M=dir clean     Delete all automatically generated files
1346 # make M=dir modules   Make all modules in specified dir
1347 # make M=dir           Same as 'make M=dir modules'
1348 # make M=dir modules_install
1349 #                      Install the modules built in the module directory
1350 #                      Assumes install directory is already created
1351
1352 # We are always building modules
1353 KBUILD_MODULES := 1
1354 PHONY += crmodverdir
1355 crmodverdir:
1356         $(cmd_crmodverdir)
1357
1358 PHONY += $(objtree)/Module.symvers
1359 $(objtree)/Module.symvers:
1360         @test -e $(objtree)/Module.symvers || ( \
1361         echo; \
1362         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1363         echo "           is missing; modules will have no dependencies and modversions."; \
1364         echo )
1365
1366 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1367 PHONY += $(module-dirs) modules
1368 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1369         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1370
1371 modules: $(module-dirs)
1372         @$(kecho) '  Building modules, stage 2.';
1373         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1374
1375 PHONY += modules_install
1376 modules_install: _emodinst_ _emodinst_post
1377
1378 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1379 PHONY += _emodinst_
1380 _emodinst_:
1381         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1382         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1383
1384 PHONY += _emodinst_post
1385 _emodinst_post: _emodinst_
1386         $(call cmd,depmod)
1387
1388 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1389
1390 PHONY += $(clean-dirs) clean
1391 $(clean-dirs):
1392         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1393
1394 clean:  rm-dirs := $(MODVERDIR)
1395 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1396                    $(KBUILD_EXTMOD)/modules.order \
1397                    $(KBUILD_EXTMOD)/modules.builtin
1398 clean: $(clean-dirs)
1399         $(call cmd,rmdirs)
1400         $(call cmd,rmfiles)
1401         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1402                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1403                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1404                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1405
1406 help:
1407         @echo  '  Building external modules.'
1408         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1409         @echo  ''
1410         @echo  '  modules         - default target, build the module(s)'
1411         @echo  '  modules_install - install the module'
1412         @echo  '  clean           - remove generated files in module directory only'
1413         @echo  ''
1414
1415 # Dummies...
1416 PHONY += prepare scripts
1417 prepare: ;
1418 scripts: ;
1419 endif # KBUILD_EXTMOD
1420
1421 # Generate tags for editors
1422 # ---------------------------------------------------------------------------
1423 quiet_cmd_tags = GEN     $@
1424       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1425
1426 tags TAGS cscope: FORCE
1427         $(call cmd,tags)
1428
1429 # Scripts to check various things for consistency
1430 # ---------------------------------------------------------------------------
1431
1432 includecheck:
1433         find * $(RCS_FIND_IGNORE) \
1434                 -name '*.[hcS]' -type f -print | sort \
1435                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1436
1437 versioncheck:
1438         find * $(RCS_FIND_IGNORE) \
1439                 -name '*.[hcS]' -type f -print | sort \
1440                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1441
1442 namespacecheck:
1443         $(PERL) $(srctree)/scripts/namespace.pl
1444
1445 export_report:
1446         $(PERL) $(srctree)/scripts/export_report.pl
1447
1448 endif #ifeq ($(config-targets),1)
1449 endif #ifeq ($(mixed-targets),1)
1450
1451 PHONY += checkstack kernelrelease kernelversion
1452
1453 # UML needs a little special treatment here.  It wants to use the host
1454 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1455 # else wants $(ARCH), including people doing cross-builds, which means
1456 # that $(SUBARCH) doesn't work here.
1457 ifeq ($(ARCH), um)
1458 CHECKSTACK_ARCH := $(SUBARCH)
1459 else
1460 CHECKSTACK_ARCH := $(ARCH)
1461 endif
1462 checkstack:
1463         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1464         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1465
1466 kernelrelease:
1467         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1468         $(error kernelrelease not valid - run 'make prepare' to update it))
1469 kernelversion:
1470         @echo $(KERNELVERSION)
1471
1472 # Single targets
1473 # ---------------------------------------------------------------------------
1474 # Single targets are compatible with:
1475 # - build with mixed source and output
1476 # - build with separate output dir 'make O=...'
1477 # - external modules
1478 #
1479 #  target-dir => where to store outputfile
1480 #  build-dir  => directory in kernel source tree to use
1481
1482 ifeq ($(KBUILD_EXTMOD),)
1483         build-dir  = $(patsubst %/,%,$(dir $@))
1484         target-dir = $(dir $@)
1485 else
1486         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1487         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1488         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1489 endif
1490
1491 %.s: %.c prepare scripts FORCE
1492         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493 %.i: %.c prepare scripts FORCE
1494         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495 %.o: %.c prepare scripts FORCE
1496         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497 %.lst: %.c prepare scripts FORCE
1498         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499 %.s: %.S prepare scripts FORCE
1500         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501 %.o: %.S prepare scripts FORCE
1502         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503 %.symtypes: %.c prepare scripts FORCE
1504         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1505
1506 # Modules
1507 /: prepare scripts FORCE
1508         $(cmd_crmodverdir)
1509         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1510         $(build)=$(build-dir)
1511 %/: prepare scripts FORCE
1512         $(cmd_crmodverdir)
1513         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1514         $(build)=$(build-dir)
1515 %.ko: prepare scripts FORCE
1516         $(cmd_crmodverdir)
1517         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1518         $(build)=$(build-dir) $(@:.ko=.o)
1519         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1520
1521 # FIXME Should go into a make.lib or something
1522 # ===========================================================================
1523
1524 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1525       cmd_rmdirs = rm -rf $(rm-dirs)
1526
1527 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1528       cmd_rmfiles = rm -f $(rm-files)
1529
1530 # Run depmod only if we have System.map and depmod is executable
1531 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1532       cmd_depmod = \
1533         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1534                 $(DEPMOD) -ae -F System.map                                     \
1535                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1536                 $(KERNELRELEASE);                                               \
1537         fi
1538
1539 # Create temporary dir for module support files
1540 # clean it up only when building all modules
1541 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1542                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1543
1544 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1545           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1546           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1547
1548 quiet_cmd_as_o_S = AS      $@
1549 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1550
1551 # read all saved command lines
1552
1553 targets := $(wildcard $(sort $(targets)))
1554 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1555
1556 ifneq ($(cmd_files),)
1557   $(cmd_files): ;       # Do not try to update included dependency files
1558   include $(cmd_files)
1559 endif
1560
1561 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1562 # Usage:
1563 # $(Q)$(MAKE) $(clean)=dir
1564 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1565
1566 endif   # skip-makefile
1567
1568 PHONY += FORCE
1569 FORCE:
1570
1571 # Declare the contents of the .PHONY variable as phony.  We keep that
1572 # information in a variable so we can use it in if_changed and friends.
1573 .PHONY: $(PHONY)