Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 33
   4 EXTRAVERSION = -rc4
   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_CTYPE=C
  22 LC_COLLATE=C
  23 LC_NUMERIC=C
  24 export LC_CTYPE LC_COLLATE LC_NUMERIC
  25
  26 # We are using a recursive build, so we need to do a little thinking
  27 # to get the ordering right.
  28 #
  29 # Most importantly: sub-Makefiles should only ever modify files in
  30 # their own directory. If in some directory we have a dependency on
  31 # a file in another dir (which doesn't happen often, but it's often
  32 # unavoidable when linking the built-in.o targets which finally
  33 # turn into vmlinux), we will call a sub make in that other dir, and
  34 # after that we are sure that everything which is in that other dir
  35 # is now up to date.
  36 #
  37 # The only cases where we need to modify files which have global
  38 # effects are thus separated out and done before the recursive
  39 # descending is started. They are now explicitly listed as the
  40 # prepare rule.
  41
  42 # To put more focus on warnings, be less verbose as default
  43 # Use 'make V=1' to see the full commands
  44
  45 ifeq ("$(origin V)", "command line")
  46   KBUILD_VERBOSE = $(V)
  47 endif
  48 ifndef KBUILD_VERBOSE
  49   KBUILD_VERBOSE = 0
  50 endif
  51
  52 # Call a source code checker (by default, "sparse") as part of the
  53 # C compilation.
  54 #
  55 # Use 'make C=1' to enable checking of only re-compiled files.
  56 # Use 'make C=2' to enable checking of *all* source files, regardless
  57 # of whether they are re-compiled or not.
  58 #
  59 # See the file "Documentation/sparse.txt" for more details, including
  60 # where to get the "sparse" utility.
  61
  62 ifeq ("$(origin C)", "command line")
  63   KBUILD_CHECKSRC = $(C)
  64 endif
  65 ifndef KBUILD_CHECKSRC
  66   KBUILD_CHECKSRC = 0
  67 endif
  68
  69 # Use make M=dir to specify directory of external module to build
  70 # Old syntax make ... SUBDIRS=$PWD is still supported
  71 # Setting the environment variable KBUILD_EXTMOD take precedence
  72 ifdef SUBDIRS
  73   KBUILD_EXTMOD ?= $(SUBDIRS)
  74 endif
  75
  76 ifeq ("$(origin M)", "command line")
  77   KBUILD_EXTMOD := $(M)
  78 endif
  79
  80 # kbuild supports saving output files in a separate directory.
  81 # To locate output files in a separate directory two syntaxes are supported.
  82 # In both cases the working directory must be the root of the kernel src.
  83 # 1) O=
  84 # Use "make O=dir/to/store/output/files/"
  85 #
  86 # 2) Set KBUILD_OUTPUT
  87 # Set the environment variable KBUILD_OUTPUT to point to the directory
  88 # where the output files shall be placed.
  89 # export KBUILD_OUTPUT=dir/to/store/output/files/
  90 # make
  91 #
  92 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  93 # variable.
  94
  95
  96 # KBUILD_SRC is set on invocation of make in OBJ directory
  97 # KBUILD_SRC is not intended to be used by the regular user (for now)
  98 ifeq ($(KBUILD_SRC),)
  99
 100 # OK, Make called in directory where kernel src resides
 101 # Do we want to locate output files in a separate directory?
 102 ifeq ("$(origin O)", "command line")
 103   KBUILD_OUTPUT := $(O)
 104 endif
 105
 106 # That's our default target when none is given on the command line
 107 PHONY := _all
 108 _all:
 109
 110 # Cancel implicit rules on top Makefile
 111 $(CURDIR)/Makefile Makefile: ;
 112
 113 ifneq ($(KBUILD_OUTPUT),)
 114 # Invoke a second make in the output directory, passing relevant variables
 115 # check that the output directory actually exists
 116 saved-output := $(KBUILD_OUTPUT)
 117 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 118 $(if $(KBUILD_OUTPUT),, \
 119      $(error output directory "$(saved-output)" does not exist))
 120
 121 PHONY += $(MAKECMDGOALS) sub-make
 122
 123 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 124         $(Q)@:
 125
 126 sub-make: FORCE
 127         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 128         KBUILD_SRC=$(CURDIR) \
 129         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 130         $(filter-out _all sub-make,$(MAKECMDGOALS))
 131
 132 # Leave processing to above invocation of make
 133 skip-makefile := 1
 134 endif # ifneq ($(KBUILD_OUTPUT),)
 135 endif # ifeq ($(KBUILD_SRC),)
 136
 137 # We process the rest of the Makefile if this is the final invocation of make
 138 ifeq ($(skip-makefile),)
 139
 140 # If building an external module we do not care about the all: rule
 141 # but instead _all depend on modules
 142 PHONY += all
 143 ifeq ($(KBUILD_EXTMOD),)
 144 _all: all
 145 else
 146 _all: modules
 147 endif
 148
 149 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 150 objtree         := $(CURDIR)
 151 src             := $(srctree)
 152 obj             := $(objtree)
 153
 154 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 155
 156 export srctree objtree VPATH
 157
 158
 159 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 160 # first, and if a usermode build is happening, the "ARCH=um" on the command
 161 # line overrides the setting of ARCH below.  If a native build is happening,
 162 # then ARCH is assigned, getting whatever value it gets normally, and
 163 # SUBARCH is subsequently ignored.
 164
 165 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 166                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 167                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 168                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 169                                   -e s/sh[234].*/sh/ )
 170
 171 # Cross compiling and selecting different set of gcc/bin-utils
 172 # ---------------------------------------------------------------------------
 173 #
 174 # When performing cross compilation for other architectures ARCH shall be set
 175 # to the target architecture. (See arch/* for the possibilities).
 176 # ARCH can be set during invocation of make:
 177 # make ARCH=ia64
 178 # Another way is to have ARCH set in the environment.
 179 # The default ARCH is the host where make is executed.
 180
 181 # CROSS_COMPILE specify the prefix used for all executables used
 182 # during compilation. Only gcc and related bin-utils executables
 183 # are prefixed with $(CROSS_COMPILE).
 184 # CROSS_COMPILE can be set on the command line
 185 # make CROSS_COMPILE=ia64-linux-
 186 # Alternatively CROSS_COMPILE can be set in the environment.
 187 # Default value for CROSS_COMPILE is not to prefix executables
 188 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 189 export KBUILD_BUILDHOST := $(SUBARCH)
 190 ARCH            ?= $(SUBARCH)
 191 CROSS_COMPILE   ?=
 192
 193 # Architecture as present in compile.h
 194 UTS_MACHINE     := $(ARCH)
 195 SRCARCH         := $(ARCH)
 196
 197 # Additional ARCH settings for x86
 198 ifeq ($(ARCH),i386)
 199         SRCARCH := x86
 200 endif
 201 ifeq ($(ARCH),x86_64)
 202         SRCARCH := x86
 203 endif
 204
 205 # Additional ARCH settings for sparc
 206 ifeq ($(ARCH),sparc64)
 207        SRCARCH := sparc
 208 endif
 209
 210 # Additional ARCH settings for sh
 211 ifeq ($(ARCH),sh64)
 212        SRCARCH := sh
 213 endif
 214
 215 # Where to locate arch specific headers
 216 hdr-arch  := $(SRCARCH)
 217
 218 ifeq ($(ARCH),m68knommu)
 219        hdr-arch  := m68k
 220 endif
 221
 222 KCONFIG_CONFIG  ?= .config
 223
 224 # SHELL used by kbuild
 225 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 226           else if [ -x /bin/bash ]; then echo /bin/bash; \
 227           else echo sh; fi ; fi)
 228
 229 HOSTCC       = gcc
 230 HOSTCXX      = g++
 231 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 232 HOSTCXXFLAGS = -O2
 233
 234 # Decide whether to build built-in, modular, or both.
 235 # Normally, just do built-in.
 236
 237 KBUILD_MODULES :=
 238 KBUILD_BUILTIN := 1
 239
 240 #       If we have only "make modules", don't compile built-in objects.
 241 #       When we're building modules with modversions, we need to consider
 242 #       the built-in objects during the descend as well, in order to
 243 #       make sure the checksums are up to date before we record them.
 244
 245 ifeq ($(MAKECMDGOALS),modules)
 246   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 247 endif
 248
 249 #       If we have "make <whatever> modules", compile modules
 250 #       in addition to whatever we do anyway.
 251 #       Just "make" or "make all" shall build modules as well
 252
 253 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 254   KBUILD_MODULES := 1
 255 endif
 256
 257 ifeq ($(MAKECMDGOALS),)
 258   KBUILD_MODULES := 1
 259 endif
 260
 261 export KBUILD_MODULES KBUILD_BUILTIN
 262 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 263
 264 # Beautify output
 265 # ---------------------------------------------------------------------------
 266 #
 267 # Normally, we echo the whole command before executing it. By making
 268 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 269 # $(quiet) to choose other forms of output instead, e.g.
 270 #
 271 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 272 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 273 #
 274 # If $(quiet) is empty, the whole command will be printed.
 275 # If it is set to "quiet_", only the short version will be printed.
 276 # If it is set to "silent_", nothing will be printed at all, since
 277 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 278 #
 279 # A simple variant is to prefix commands with $(Q) - that's useful
 280 # for commands that shall be hidden in non-verbose mode.
 281 #
 282 #       $(Q)ln $@ :<
 283 #
 284 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 285 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 286
 287 ifeq ($(KBUILD_VERBOSE),1)
 288   quiet =
 289   Q =
 290 else
 291   quiet=quiet_
 292   Q = @
 293 endif
 294
 295 # If the user is running make -s (silent mode), suppress echoing of
 296 # commands
 297
 298 ifneq ($(findstring s,$(MAKEFLAGS)),)
 299   quiet=silent_
 300 endif
 301
 302 export quiet Q KBUILD_VERBOSE
 303
 304
 305 # Look for make include files relative to root of kernel src
 306 MAKEFLAGS += --include-dir=$(srctree)
 307
 308 # We need some generic definitions (do not try to remake the file).
 309 $(srctree)/scripts/Kbuild.include: ;
 310 include $(srctree)/scripts/Kbuild.include
 311
 312 # Make variables (CC, etc...)
 313
 314 AS              = $(CROSS_COMPILE)as
 315 LD              = $(CROSS_COMPILE)ld
 316 CC              = $(CROSS_COMPILE)gcc
 317 CPP             = $(CC) -E
 318 AR              = $(CROSS_COMPILE)ar
 319 NM              = $(CROSS_COMPILE)nm
 320 STRIP           = $(CROSS_COMPILE)strip
 321 OBJCOPY         = $(CROSS_COMPILE)objcopy
 322 OBJDUMP         = $(CROSS_COMPILE)objdump
 323 AWK             = awk
 324 GENKSYMS        = scripts/genksyms/genksyms
 325 INSTALLKERNEL  := installkernel
 326 DEPMOD          = /sbin/depmod
 327 KALLSYMS        = scripts/kallsyms
 328 PERL            = perl
 329 CHECK           = sparse
 330
 331 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 332                   -Wbitwise -Wno-return-void $(CF)
 333 MODFLAGS        = -DMODULE
 334 CFLAGS_MODULE   = $(MODFLAGS)
 335 AFLAGS_MODULE   = $(MODFLAGS)
 336 LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 337 CFLAGS_KERNEL   =
 338 AFLAGS_KERNEL   =
 339 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 340
 341
 342 # Use LINUXINCLUDE when you must reference the include/ directory.
 343 # Needed to be compatible with the O= option
 344 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 345                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 346                    -include include/generated/autoconf.h
 347
 348 KBUILD_CPPFLAGS := -D__KERNEL__
 349
 350 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 351                    -fno-strict-aliasing -fno-common \
 352                    -Werror-implicit-function-declaration \
 353                    -Wno-format-security \
 354                    -fno-delete-null-pointer-checks
 355 KBUILD_AFLAGS   := -D__ASSEMBLY__
 356
 357 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 358 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 359 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 360
 361 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 362 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 363 export CPP AR NM STRIP OBJCOPY OBJDUMP
 364 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 365 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 366
 367 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 368 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 369 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 370
 371 # When compiling out-of-tree modules, put MODVERDIR in the module
 372 # tree rather than in the kernel tree. The kernel tree might
 373 # even be read-only.
 374 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 375
 376 # Files to ignore in find ... statements
 377
 378 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
 379 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 380
 381 # ===========================================================================
 382 # Rules shared between *config targets and build targets
 383
 384 # Basic helpers built in scripts/
 385 PHONY += scripts_basic
 386 scripts_basic:
 387         $(Q)$(MAKE) $(build)=scripts/basic
 388         $(Q)rm -f .tmp_quiet_recordmcount
 389
 390 # To avoid any implicit rule to kick in, define an empty command.
 391 scripts/basic/%: scripts_basic ;
 392
 393 PHONY += outputmakefile
 394 # outputmakefile generates a Makefile in the output directory, if using a
 395 # separate output directory. This allows convenient use of make in the
 396 # output directory.
 397 outputmakefile:
 398 ifneq ($(KBUILD_SRC),)
 399         $(Q)ln -fsn $(srctree) source
 400         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 401             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 402 endif
 403
 404 # To make sure we do not include .config for any of the *config targets
 405 # catch them early, and hand them over to scripts/kconfig/Makefile
 406 # It is allowed to specify more targets when calling make, including
 407 # mixing *config targets and build targets.
 408 # For example 'make oldconfig all'.
 409 # Detect when mixed targets is specified, and make a second invocation
 410 # of make so .config is not included in this case either (for *config).
 411
 412 no-dot-config-targets := clean mrproper distclean \
 413                          cscope TAGS tags help %docs check% \
 414                          include/linux/version.h headers_% \
 415                          kernelrelease kernelversion
 416
 417 config-targets := 0
 418 mixed-targets  := 0
 419 dot-config     := 1
 420
 421 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 422         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 423                 dot-config := 0
 424         endif
 425 endif
 426
 427 ifeq ($(KBUILD_EXTMOD),)
 428         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 429                 config-targets := 1
 430                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 431                         mixed-targets := 1
 432                 endif
 433         endif
 434 endif
 435
 436 ifeq ($(mixed-targets),1)
 437 # ===========================================================================
 438 # We're called with mixed targets (*config and build targets).
 439 # Handle them one by one.
 440
 441 %:: FORCE
 442         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 443
 444 else
 445 ifeq ($(config-targets),1)
 446 # ===========================================================================
 447 # *config targets only - make sure prerequisites are updated, and descend
 448 # in scripts/kconfig to make the *config target
 449
 450 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 451 # KBUILD_DEFCONFIG may point out an alternative default configuration
 452 # used for 'make defconfig'
 453 include $(srctree)/arch/$(SRCARCH)/Makefile
 454 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 455
 456 config: scripts_basic outputmakefile FORCE
 457         $(Q)mkdir -p include/linux include/config
 458         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 459
 460 %config: scripts_basic outputmakefile FORCE
 461         $(Q)mkdir -p include/linux include/config
 462         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 463
 464 else
 465 # ===========================================================================
 466 # Build targets only - this includes vmlinux, arch specific targets, clean
 467 # targets and others. In general all targets except *config targets.
 468
 469 ifeq ($(KBUILD_EXTMOD),)
 470 # Additional helpers built in scripts/
 471 # Carefully list dependencies so we do not try to build scripts twice
 472 # in parallel
 473 PHONY += scripts
 474 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 475         $(Q)$(MAKE) $(build)=$(@)
 476
 477 # Objects we will link into vmlinux / subdirs we need to visit
 478 init-y          := init/
 479 drivers-y       := drivers/ sound/ firmware/
 480 net-y           := net/
 481 libs-y          := lib/
 482 core-y          := usr/
 483 endif # KBUILD_EXTMOD
 484
 485 ifeq ($(dot-config),1)
 486 # Read in config
 487 -include include/config/auto.conf
 488
 489 ifeq ($(KBUILD_EXTMOD),)
 490 # Read in dependencies to all Kconfig* files, make sure to run
 491 # oldconfig if changes are detected.
 492 -include include/config/auto.conf.cmd
 493
 494 # To avoid any implicit rule to kick in, define an empty command
 495 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 496
 497 # If .config is newer than include/config/auto.conf, someone tinkered
 498 # with it and forgot to run make oldconfig.
 499 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 500 # we execute the config step to be sure to catch updated Kconfig files
 501 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 502         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 503 else
 504 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 505 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 506 PHONY += include/config/auto.conf
 507
 508 include/config/auto.conf:
 509         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 510         echo;                                                           \
 511         echo "  ERROR: Kernel configuration is invalid.";               \
 512         echo "         include/generated/autoconf.h or $@ are missing.";\
 513         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 514         echo;                                                           \
 515         /bin/false)
 516
 517 endif # KBUILD_EXTMOD
 518
 519 else
 520 # Dummy target needed, because used as prerequisite
 521 include/config/auto.conf: ;
 522 endif # $(dot-config)
 523
 524 # The all: target is the default when no target is given on the
 525 # command line.
 526 # This allow a user to issue only 'make' to build a kernel including modules
 527 # Defaults vmlinux but it is usually overridden in the arch makefile
 528 all: vmlinux
 529
 530 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 531 KBUILD_CFLAGS   += -Os
 532 else
 533 KBUILD_CFLAGS   += -O2
 534 endif
 535
 536 include $(srctree)/arch/$(SRCARCH)/Makefile
 537
 538 ifneq ($(CONFIG_FRAME_WARN),0)
 539 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 540 endif
 541
 542 # Force gcc to behave correct even for buggy distributions
 543 ifndef CONFIG_CC_STACKPROTECTOR
 544 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 545 endif
 546
 547 ifdef CONFIG_FRAME_POINTER
 548 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 549 else
 550 KBUILD_CFLAGS   += -fomit-frame-pointer
 551 endif
 552
 553 ifdef CONFIG_DEBUG_INFO
 554 KBUILD_CFLAGS   += -g
 555 KBUILD_AFLAGS   += -gdwarf-2
 556 endif
 557
 558 ifdef CONFIG_FUNCTION_TRACER
 559 KBUILD_CFLAGS   += -pg
 560 endif
 561
 562 # We trigger additional mismatches with less inlining
 563 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 564 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 565 endif
 566
 567 # arch Makefile may override CC so keep this after arch Makefile is included
 568 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 569 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 570
 571 # warn about C99 declaration after statement
 572 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 573
 574 # disable pointer signed / unsigned warnings in gcc 4.0
 575 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 576
 577 # disable invalid "can't wrap" optimizations for signed / pointers
 578 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 579
 580 # revert to pre-gcc-4.4 behaviour of .eh_frame
 581 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 582
 583 # conserve stack if available
 584 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 585
 586 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 587 # But warn user when we do so
 588 warn-assign = \
 589 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 590
 591 ifneq ($(KCPPFLAGS),)
 592         $(call warn-assign,CPPFLAGS)
 593         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 594 endif
 595 ifneq ($(KAFLAGS),)
 596         $(call warn-assign,AFLAGS)
 597         KBUILD_AFLAGS += $(KAFLAGS)
 598 endif
 599 ifneq ($(KCFLAGS),)
 600         $(call warn-assign,CFLAGS)
 601         KBUILD_CFLAGS += $(KCFLAGS)
 602 endif
 603
 604 # Use --build-id when available.
 605 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 606                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 607 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 608 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 609
 610 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 611 LDFLAGS_vmlinux += $(call ld-option, -X,)
 612 endif
 613
 614 # Default kernel image to build when no specific target is given.
 615 # KBUILD_IMAGE may be overruled on the command line or
 616 # set in the environment
 617 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 618 # this default value
 619 export KBUILD_IMAGE ?= vmlinux
 620
 621 #
 622 # INSTALL_PATH specifies where to place the updated kernel and system map
 623 # images. Default is /boot, but you can set it to other values
 624 export  INSTALL_PATH ?= /boot
 625
 626 #
 627 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 628 # relocations required by build roots.  This is not defined in the
 629 # makefile but the argument can be passed to make if needed.
 630 #
 631
 632 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 633 export MODLIB
 634
 635 #
 636 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 637 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 638 #  the default option --strip-debug will be used.  Otherwise,
 639 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 640
 641 ifdef INSTALL_MOD_STRIP
 642 ifeq ($(INSTALL_MOD_STRIP),1)
 643 mod_strip_cmd = $(STRIP) --strip-debug
 644 else
 645 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 646 endif # INSTALL_MOD_STRIP=1
 647 else
 648 mod_strip_cmd = true
 649 endif # INSTALL_MOD_STRIP
 650 export mod_strip_cmd
 651
 652
 653 ifeq ($(KBUILD_EXTMOD),)
 654 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 655
 656 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 657                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 658                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 659
 660 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 661                      $(init-n) $(init-) \
 662                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 663                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 664
 665 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 666 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 667 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 668 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 669 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 670 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 671 libs-y          := $(libs-y1) $(libs-y2)
 672
 673 # Build vmlinux
 674 # ---------------------------------------------------------------------------
 675 # vmlinux is built from the objects selected by $(vmlinux-init) and
 676 # $(vmlinux-main). Most are built-in.o files from top-level directories
 677 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 678 # Ordering when linking is important, and $(vmlinux-init) must be first.
 679 #
 680 # vmlinux
 681 #   ^
 682 #   |
 683 #   +-< $(vmlinux-init)
 684 #   |   +--< init/version.o + more
 685 #   |
 686 #   +--< $(vmlinux-main)
 687 #   |    +--< driver/built-in.o mm/built-in.o + more
 688 #   |
 689 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 690 #
 691 # vmlinux version (uname -v) cannot be updated during normal
 692 # descending-into-subdirs phase since we do not yet know if we need to
 693 # update vmlinux.
 694 # Therefore this step is delayed until just before final link of vmlinux -
 695 # except in the kallsyms case where it is done just before adding the
 696 # symbols to the kernel.
 697 #
 698 # System.map is generated to document addresses of all kernel symbols
 699
 700 vmlinux-init := $(head-y) $(init-y)
 701 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 702 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 703 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 704 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 705
 706 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 707 # May be overridden by arch/$(ARCH)/Makefile
 708 quiet_cmd_vmlinux__ ?= LD      $@
 709       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 710       -T $(vmlinux-lds) $(vmlinux-init)                          \
 711       --start-group $(vmlinux-main) --end-group                  \
 712       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 713
 714 # Generate new vmlinux version
 715 quiet_cmd_vmlinux_version = GEN     .version
 716       cmd_vmlinux_version = set -e;                     \
 717         if [ ! -r .version ]; then                      \
 718           rm -f .version;                               \
 719           echo 1 >.version;                             \
 720         else                                            \
 721           mv .version .old_version;                     \
 722           expr 0$$(cat .old_version) + 1 >.version;     \
 723         fi;                                             \
 724         $(MAKE) $(build)=init
 725
 726 # Generate System.map
 727 quiet_cmd_sysmap = SYSMAP
 728       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 729
 730 # Link of vmlinux
 731 # If CONFIG_KALLSYMS is set .version is already updated
 732 # Generate System.map and verify that the content is consistent
 733 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 734 # First command is ':' to allow us to use + in front of the rule
 735 define rule_vmlinux__
 736         :
 737         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 738
 739         $(call cmd,vmlinux__)
 740         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 741
 742         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 743           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 744         $(cmd_sysmap) $@ System.map;                                         \
 745         if [ $$? -ne 0 ]; then                                               \
 746                 rm -f $@;                                                    \
 747                 /bin/false;                                                  \
 748         fi;
 749         $(verify_kallsyms)
 750 endef
 751
 752
 753 ifdef CONFIG_KALLSYMS
 754 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 755 # It's a three stage process:
 756 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 757 #   empty
 758 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 759 #   the right size - vmlinux version (uname -v) is updated during this step
 760 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 761 #   but due to the added section, some addresses have shifted.
 762 #   From here, we generate a correct .tmp_kallsyms2.o
 763 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 764 # o Verify that the System.map from vmlinux matches the map from
 765 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 766 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 767 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 768 #   temporary bypass to allow the kernel to be built while the
 769 #   maintainers work out what went wrong with kallsyms.
 770
 771 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 772 last_kallsyms := 3
 773 else
 774 last_kallsyms := 2
 775 endif
 776
 777 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 778
 779 define verify_kallsyms
 780         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 781           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 782           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 783         $(Q)cmp -s System.map .tmp_System.map ||                             \
 784                 (echo Inconsistent kallsyms data;                            \
 785                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 786                  rm .tmp_kallsyms* ; /bin/false )
 787 endef
 788
 789 # Update vmlinux version before link
 790 # Use + in front of this rule to silent warning about make -j1
 791 # First command is ':' to allow us to use + in front of this rule
 792 cmd_ksym_ld = $(cmd_vmlinux__)
 793 define rule_ksym_ld
 794         :
 795         +$(call cmd,vmlinux_version)
 796         $(call cmd,vmlinux__)
 797         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 798 endef
 799
 800 # Generate .S file with all kernel symbols
 801 quiet_cmd_kallsyms = KSYM    $@
 802       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 803                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 804
 805 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 806         $(call if_changed_dep,as_o_S)
 807
 808 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 809         $(call cmd,kallsyms)
 810
 811 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 812 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 813         $(call if_changed_rule,ksym_ld)
 814
 815 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 816         $(call if_changed,vmlinux__)
 817
 818 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 819         $(call if_changed,vmlinux__)
 820
 821 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 822 $(KALLSYMS): scripts ;
 823
 824 # Generate some data for debugging strange kallsyms problems
 825 debug_kallsyms: .tmp_map$(last_kallsyms)
 826
 827 .tmp_map%: .tmp_vmlinux% FORCE
 828         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 829
 830 .tmp_map3: .tmp_map2
 831
 832 .tmp_map2: .tmp_map1
 833
 834 endif # ifdef CONFIG_KALLSYMS
 835
 836 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 837 # relevant sections renamed as per the linker script.
 838 quiet_cmd_vmlinux-modpost = LD      $@
 839       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 840          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 841          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 842 define rule_vmlinux-modpost
 843         :
 844         +$(call cmd,vmlinux-modpost)
 845         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 846         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 847 endef
 848
 849 # vmlinux image - including updated kernel symbols
 850 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 851 ifdef CONFIG_HEADERS_CHECK
 852         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 853 endif
 854 ifdef CONFIG_SAMPLES
 855         $(Q)$(MAKE) $(build)=samples
 856 endif
 857 ifdef CONFIG_BUILD_DOCSRC
 858         $(Q)$(MAKE) $(build)=Documentation
 859 endif
 860         $(call vmlinux-modpost)
 861         $(call if_changed_rule,vmlinux__)
 862         $(Q)rm -f .old_version
 863
 864 # build vmlinux.o first to catch section mismatch errors early
 865 ifdef CONFIG_KALLSYMS
 866 .tmp_vmlinux1: vmlinux.o
 867 endif
 868
 869 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 870 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 871         $(call if_changed_rule,vmlinux-modpost)
 872
 873 # The actual objects are generated when descending,
 874 # make sure no implicit rule kicks in
 875 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 876
 877 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 878 # Preset locale variables to speed up the build process. Limit locale
 879 # tweaks to this spot to avoid wrong language settings when running
 880 # make menuconfig etc.
 881 # Error messages still appears in the original language
 882
 883 PHONY += $(vmlinux-dirs)
 884 $(vmlinux-dirs): prepare scripts
 885         $(Q)$(MAKE) $(build)=$@
 886 ifdef CONFIG_MODULES
 887         $(Q)$(MAKE) $(modbuiltin)=$@
 888 endif
 889
 890 # Build the kernel release string
 891 #
 892 # The KERNELRELEASE value built here is stored in the file
 893 # include/config/kernel.release, and is used when executing several
 894 # make targets, such as "make install" or "make modules_install."
 895 #
 896 # The eventual kernel release string consists of the following fields,
 897 # shown in a hierarchical format to show how smaller parts are concatenated
 898 # to form the larger and final value, with values coming from places like
 899 # the Makefile, kernel config options, make command line options and/or
 900 # SCM tag information.
 901 #
 902 #       $(KERNELVERSION)
 903 #         $(VERSION)                    eg, 2
 904 #         $(PATCHLEVEL)                 eg, 6
 905 #         $(SUBLEVEL)                   eg, 18
 906 #         $(EXTRAVERSION)               eg, -rc6
 907 #       $(localver-full)
 908 #         $(localver)
 909 #           localversion*               (files without backups, containing '~')
 910 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 911 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 912 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 913 #           $(LOCALVERSION)             (from make command line if provided)
 914 #
 915 #  Note how the final $(localver-auto) string is included *only* if the
 916 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 917 # moment, only git is supported but other SCMs can edit the script
 918 # scripts/setlocalversion and add the appropriate checks as needed.
 919
 920 pattern = ".*/localversion[^~]*"
 921 string  = $(shell cat /dev/null \
 922            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 923
 924 localver = $(subst $(space),, $(string) \
 925                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 926
 927 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 928 # and if the SCM is know a tag from the SCM is appended.
 929 # The appended tag is determined by the SCM used.
 930 #
 931 # .scmversion is used when generating rpm packages so we do not loose
 932 # the version information from the SCM when we do the build of the kernel
 933 # from the copied source
 934 ifdef CONFIG_LOCALVERSION_AUTO
 935
 936 ifeq ($(wildcard .scmversion),)
 937         _localver-auto = $(shell $(CONFIG_SHELL) \
 938                          $(srctree)/scripts/setlocalversion $(srctree))
 939 else
 940         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 941 endif
 942
 943         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 944 endif
 945
 946 localver-full = $(localver)$(localver-auto)
 947
 948 # Store (new) KERNELRELASE string in include/config/kernel.release
 949 kernelrelease = $(KERNELVERSION)$(localver-full)
 950 include/config/kernel.release: include/config/auto.conf FORCE
 951         $(Q)rm -f $@
 952         $(Q)echo $(kernelrelease) > $@
 953
 954
 955 # Things we need to do before we recursively start building the kernel
 956 # or the modules are listed in "prepare".
 957 # A multi level approach is used. prepareN is processed before prepareN-1.
 958 # archprepare is used in arch Makefiles and when processed asm symlink,
 959 # version.h and scripts_basic is processed / created.
 960
 961 # Listed in dependency order
 962 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 963
 964 # prepare3 is used to check if we are building in a separate output directory,
 965 # and if so do:
 966 # 1) Check that make has not been executed in the kernel src $(srctree)
 967 prepare3: include/config/kernel.release
 968 ifneq ($(KBUILD_SRC),)
 969         @$(kecho) '  Using $(srctree) as source for kernel'
 970         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 971                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 972                 echo "  in the '$(srctree)' directory.";\
 973                 /bin/false; \
 974         fi;
 975 endif
 976
 977 # prepare2 creates a makefile if using a separate output directory
 978 prepare2: prepare3 outputmakefile
 979
 980 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 981                    include/config/auto.conf
 982         $(cmd_crmodverdir)
 983
 984 archprepare: prepare1 scripts_basic
 985
 986 prepare0: archprepare FORCE
 987         $(Q)$(MAKE) $(build)=.
 988         $(Q)$(MAKE) $(build)=. missing-syscalls
 989
 990 # All the preparing..
 991 prepare: prepare0
 992
 993 # Generate some files
 994 # ---------------------------------------------------------------------------
 995
 996 # KERNELRELEASE can change from a few different places, meaning version.h
 997 # needs to be updated, so this check is forced on all builds
 998
 999 uts_len := 64
1000 define filechk_utsrelease.h
1001         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1002           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1003           exit 1;                                                         \
1004         fi;                                                               \
1005         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1006 endef
1007
1008 define filechk_version.h
1009         (echo \#define LINUX_VERSION_CODE $(shell                             \
1010         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1011         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1012 endef
1013
1014 include/linux/version.h: $(srctree)/Makefile FORCE
1015         $(call filechk,version.h)
1016
1017 include/generated/utsrelease.h: include/config/kernel.release FORCE
1018         $(call filechk,utsrelease.h)
1019
1020 PHONY += headerdep
1021 headerdep:
1022         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1023
1024 # ---------------------------------------------------------------------------
1025
1026 PHONY += depend dep
1027 depend dep:
1028         @echo '*** Warning: make $@ is unnecessary now.'
1029
1030 # ---------------------------------------------------------------------------
1031 # Firmware install
1032 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1033 export INSTALL_FW_PATH
1034
1035 PHONY += firmware_install
1036 firmware_install: FORCE
1037         @mkdir -p $(objtree)/firmware
1038         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1039
1040 # ---------------------------------------------------------------------------
1041 # Kernel headers
1042
1043 #Default location for installed headers
1044 export INSTALL_HDR_PATH = $(objtree)/usr
1045
1046 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1047
1048 # If we do an all arch process set dst to asm-$(hdr-arch)
1049 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1050
1051 PHONY += __headers
1052 __headers: include/linux/version.h scripts_basic FORCE
1053         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1054
1055 PHONY += headers_install_all
1056 headers_install_all:
1057         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1058
1059 PHONY += headers_install
1060 headers_install: __headers
1061         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1062         $(error Headers not exportable for the $(SRCARCH) architecture))
1063         $(Q)$(MAKE) $(hdr-inst)=include
1064         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1065
1066 PHONY += headers_check_all
1067 headers_check_all: headers_install_all
1068         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1069
1070 PHONY += headers_check
1071 headers_check: headers_install
1072         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1073         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1074
1075 # ---------------------------------------------------------------------------
1076 # Modules
1077
1078 ifdef CONFIG_MODULES
1079
1080 # By default, build modules as well
1081
1082 all: modules
1083
1084 #       Build modules
1085 #
1086 #       A module can be listed more than once in obj-m resulting in
1087 #       duplicate lines in modules.order files.  Those are removed
1088 #       using awk while concatenating to the final file.
1089
1090 PHONY += modules
1091 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1092         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1093         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
1094         @$(kecho) '  Building modules, stage 2.';
1095         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1096         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1097
1098
1099 # Target to prepare building external modules
1100 PHONY += modules_prepare
1101 modules_prepare: prepare scripts
1102
1103 # Target to install modules
1104 PHONY += modules_install
1105 modules_install: _modinst_ _modinst_post
1106
1107 PHONY += _modinst_
1108 _modinst_:
1109         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1110                 echo "Warning: you may need to install module-init-tools"; \
1111                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1112                 sleep 1; \
1113         fi
1114         @rm -rf $(MODLIB)/kernel
1115         @rm -f $(MODLIB)/source
1116         @mkdir -p $(MODLIB)/kernel
1117         @ln -s $(srctree) $(MODLIB)/source
1118         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1119                 rm -f $(MODLIB)/build ; \
1120                 ln -s $(objtree) $(MODLIB)/build ; \
1121         fi
1122         @cp -f $(objtree)/modules.order $(MODLIB)/
1123         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1124         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1125
1126 # This depmod is only for convenience to give the initial
1127 # boot a modules.dep even before / is mounted read-write.  However the
1128 # boot script depmod is the master version.
1129 PHONY += _modinst_post
1130 _modinst_post: _modinst_
1131         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1132         $(call cmd,depmod)
1133
1134 else # CONFIG_MODULES
1135
1136 # Modules not configured
1137 # ---------------------------------------------------------------------------
1138
1139 modules modules_install: FORCE
1140         @echo
1141         @echo "The present kernel configuration has modules disabled."
1142         @echo "Type 'make config' and enable loadable module support."
1143         @echo "Then build a kernel with module support enabled."
1144         @echo
1145         @exit 1
1146
1147 endif # CONFIG_MODULES
1148
1149 ###
1150 # Cleaning is done on three levels.
1151 # make clean     Delete most generated files
1152 #                Leave enough to build external modules
1153 # make mrproper  Delete the current configuration, and all generated files
1154 # make distclean Remove editor backup files, patch leftover files and the like
1155
1156 # Directories & files removed with 'make clean'
1157 CLEAN_DIRS  += $(MODVERDIR)
1158 CLEAN_FILES +=  vmlinux System.map \
1159                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1160
1161 # Directories & files removed with 'make mrproper'
1162 MRPROPER_DIRS  += include/config usr/include include/generated
1163 MRPROPER_FILES += .config .config.old .version .old_version             \
1164                   include/linux/version.h                               \
1165                   Module.symvers tags TAGS cscope*
1166
1167 # clean - Delete most, but leave enough to build external modules
1168 #
1169 clean: rm-dirs  := $(CLEAN_DIRS)
1170 clean: rm-files := $(CLEAN_FILES)
1171 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1172
1173 PHONY += $(clean-dirs) clean archclean
1174 $(clean-dirs):
1175         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1176
1177 clean: archclean $(clean-dirs)
1178         $(call cmd,rmdirs)
1179         $(call cmd,rmfiles)
1180         @find . $(RCS_FIND_IGNORE) \
1181                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1182                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1183                 -o -name '*.symtypes' -o -name 'modules.order' \
1184                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1185                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1186
1187 # mrproper - Delete all generated files, including .config
1188 #
1189 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1190 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1191 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1192
1193 PHONY += $(mrproper-dirs) mrproper archmrproper
1194 $(mrproper-dirs):
1195         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1196
1197 mrproper: clean archmrproper $(mrproper-dirs)
1198         $(call cmd,rmdirs)
1199         $(call cmd,rmfiles)
1200
1201 # distclean
1202 #
1203 PHONY += distclean
1204
1205 distclean: mrproper
1206         @find $(srctree) $(RCS_FIND_IGNORE) \
1207                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1208                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1209                 -o -name '.*.rej' -o -size 0 \
1210                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1211                 -type f -print | xargs rm -f
1212
1213
1214 # Packaging of the kernel to various formats
1215 # ---------------------------------------------------------------------------
1216 # rpm target kept for backward compatibility
1217 package-dir     := $(srctree)/scripts/package
1218
1219 %pkg: include/config/kernel.release FORCE
1220         $(Q)$(MAKE) $(build)=$(package-dir) $@
1221 rpm: include/config/kernel.release FORCE
1222         $(Q)$(MAKE) $(build)=$(package-dir) $@
1223
1224
1225 # Brief documentation of the typical targets used
1226 # ---------------------------------------------------------------------------
1227
1228 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1229 boards := $(notdir $(boards))
1230 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1231 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1232
1233 help:
1234         @echo  'Cleaning targets:'
1235         @echo  '  clean           - Remove most generated files but keep the config and'
1236         @echo  '                    enough build support to build external modules'
1237         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1238         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1239         @echo  ''
1240         @echo  'Configuration targets:'
1241         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1242         @echo  ''
1243         @echo  'Other generic targets:'
1244         @echo  '  all             - Build all targets marked with [*]'
1245         @echo  '* vmlinux         - Build the bare kernel'
1246         @echo  '* modules         - Build all modules'
1247         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1248         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1249         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1250         @echo  '  dir/            - Build all files in dir and below'
1251         @echo  '  dir/file.[ois]  - Build specified target only'
1252         @echo  '  dir/file.ko     - Build module including final link'
1253         @echo  '  modules_prepare - Set up for building external modules'
1254         @echo  '  tags/TAGS       - Generate tags file for editors'
1255         @echo  '  cscope          - Generate cscope index'
1256         @echo  '  kernelrelease   - Output the release version string'
1257         @echo  '  kernelversion   - Output the version stored in Makefile'
1258         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1259          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1260          echo  ''
1261         @echo  'Static analysers'
1262         @echo  '  checkstack      - Generate a list of stack hogs'
1263         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1264         @echo  '  versioncheck    - Sanity check on version.h usage'
1265         @echo  '  includecheck    - Check for duplicate included header files'
1266         @echo  '  export_report   - List the usages of all exported symbols'
1267         @echo  '  headers_check   - Sanity check on exported headers'
1268         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1269          echo  ''
1270         @echo  'Kernel packaging:'
1271         @$(MAKE) $(build)=$(package-dir) help
1272         @echo  ''
1273         @echo  'Documentation targets:'
1274         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1275         @echo  ''
1276         @echo  'Architecture specific targets ($(SRCARCH)):'
1277         @$(if $(archhelp),$(archhelp),\
1278                 echo '  No architecture specific help defined for $(SRCARCH)')
1279         @echo  ''
1280         @$(if $(boards), \
1281                 $(foreach b, $(boards), \
1282                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1283                 echo '')
1284         @$(if $(board-dirs), \
1285                 $(foreach b, $(board-dirs), \
1286                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1287                 printf "  %-16s - Show all of the above\\n" help-boards; \
1288                 echo '')
1289
1290         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1291         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1292         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1293         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1294         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1295         @echo  ''
1296         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1297         @echo  'For further info see the ./README file'
1298
1299
1300 help-board-dirs := $(addprefix help-,$(board-dirs))
1301
1302 help-boards: $(help-board-dirs)
1303
1304 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1305
1306 $(help-board-dirs): help-%:
1307         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1308         @$(if $(boards-per-dir), \
1309                 $(foreach b, $(boards-per-dir), \
1310                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1311                 echo '')
1312
1313
1314 # Documentation targets
1315 # ---------------------------------------------------------------------------
1316 %docs: scripts_basic FORCE
1317         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1318
1319 else # KBUILD_EXTMOD
1320
1321 ###
1322 # External module support.
1323 # When building external modules the kernel used as basis is considered
1324 # read-only, and no consistency checks are made and the make
1325 # system is not used on the basis kernel. If updates are required
1326 # in the basis kernel ordinary make commands (without M=...) must
1327 # be used.
1328 #
1329 # The following are the only valid targets when building external
1330 # modules.
1331 # make M=dir clean     Delete all automatically generated files
1332 # make M=dir modules   Make all modules in specified dir
1333 # make M=dir           Same as 'make M=dir modules'
1334 # make M=dir modules_install
1335 #                      Install the modules built in the module directory
1336 #                      Assumes install directory is already created
1337
1338 # We are always building modules
1339 KBUILD_MODULES := 1
1340 PHONY += crmodverdir
1341 crmodverdir:
1342         $(cmd_crmodverdir)
1343
1344 PHONY += $(objtree)/Module.symvers
1345 $(objtree)/Module.symvers:
1346         @test -e $(objtree)/Module.symvers || ( \
1347         echo; \
1348         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1349         echo "           is missing; modules will have no dependencies and modversions."; \
1350         echo )
1351
1352 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1353 PHONY += $(module-dirs) modules
1354 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1355         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1356
1357 modules: $(module-dirs)
1358         @$(kecho) '  Building modules, stage 2.';
1359         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1360
1361 PHONY += modules_install
1362 modules_install: _emodinst_ _emodinst_post
1363
1364 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1365 PHONY += _emodinst_
1366 _emodinst_:
1367         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1368         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1369
1370 PHONY += _emodinst_post
1371 _emodinst_post: _emodinst_
1372         $(call cmd,depmod)
1373
1374 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1375
1376 PHONY += $(clean-dirs) clean
1377 $(clean-dirs):
1378         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1379
1380 clean:  rm-dirs := $(MODVERDIR)
1381 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1382                    $(KBUILD_EXTMOD)/modules.order \
1383                    $(KBUILD_EXTMOD)/modules.builtin
1384 clean: $(clean-dirs)
1385         $(call cmd,rmdirs)
1386         $(call cmd,rmfiles)
1387         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1388                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1389                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1390                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1391
1392 help:
1393         @echo  '  Building external modules.'
1394         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1395         @echo  ''
1396         @echo  '  modules         - default target, build the module(s)'
1397         @echo  '  modules_install - install the module'
1398         @echo  '  clean           - remove generated files in module directory only'
1399         @echo  ''
1400
1401 # Dummies...
1402 PHONY += prepare scripts
1403 prepare: ;
1404 scripts: ;
1405 endif # KBUILD_EXTMOD
1406
1407 # Generate tags for editors
1408 # ---------------------------------------------------------------------------
1409 quiet_cmd_tags = GEN     $@
1410       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1411
1412 tags TAGS cscope: FORCE
1413         $(call cmd,tags)
1414
1415 # Scripts to check various things for consistency
1416 # ---------------------------------------------------------------------------
1417
1418 includecheck:
1419         find * $(RCS_FIND_IGNORE) \
1420                 -name '*.[hcS]' -type f -print | sort \
1421                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1422
1423 versioncheck:
1424         find * $(RCS_FIND_IGNORE) \
1425                 -name '*.[hcS]' -type f -print | sort \
1426                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1427
1428 namespacecheck:
1429         $(PERL) $(srctree)/scripts/namespace.pl
1430
1431 export_report:
1432         $(PERL) $(srctree)/scripts/export_report.pl
1433
1434 endif #ifeq ($(config-targets),1)
1435 endif #ifeq ($(mixed-targets),1)
1436
1437 PHONY += checkstack kernelrelease kernelversion
1438
1439 # UML needs a little special treatment here.  It wants to use the host
1440 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1441 # else wants $(ARCH), including people doing cross-builds, which means
1442 # that $(SUBARCH) doesn't work here.
1443 ifeq ($(ARCH), um)
1444 CHECKSTACK_ARCH := $(SUBARCH)
1445 else
1446 CHECKSTACK_ARCH := $(ARCH)
1447 endif
1448 checkstack:
1449         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1450         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1451
1452 kernelrelease:
1453         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1454         $(error kernelrelease not valid - run 'make prepare' to update it))
1455 kernelversion:
1456         @echo $(KERNELVERSION)
1457
1458 # Single targets
1459 # ---------------------------------------------------------------------------
1460 # Single targets are compatible with:
1461 # - build with mixed source and output
1462 # - build with separate output dir 'make O=...'
1463 # - external modules
1464 #
1465 #  target-dir => where to store outputfile
1466 #  build-dir  => directory in kernel source tree to use
1467
1468 ifeq ($(KBUILD_EXTMOD),)
1469         build-dir  = $(patsubst %/,%,$(dir $@))
1470         target-dir = $(dir $@)
1471 else
1472         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1473         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1474         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1475 endif
1476
1477 %.s: %.c prepare scripts FORCE
1478         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479 %.i: %.c prepare scripts FORCE
1480         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481 %.o: %.c prepare scripts FORCE
1482         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483 %.lst: %.c prepare scripts FORCE
1484         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1485 %.s: %.S prepare scripts FORCE
1486         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1487 %.o: %.S prepare scripts FORCE
1488         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1489 %.symtypes: %.c prepare scripts FORCE
1490         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491
1492 # Modules
1493 /: prepare scripts FORCE
1494         $(cmd_crmodverdir)
1495         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1496         $(build)=$(build-dir)
1497 %/: prepare scripts FORCE
1498         $(cmd_crmodverdir)
1499         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1500         $(build)=$(build-dir)
1501 %.ko: prepare scripts FORCE
1502         $(cmd_crmodverdir)
1503         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1504         $(build)=$(build-dir) $(@:.ko=.o)
1505         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1506
1507 # FIXME Should go into a make.lib or something
1508 # ===========================================================================
1509
1510 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1511       cmd_rmdirs = rm -rf $(rm-dirs)
1512
1513 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1514       cmd_rmfiles = rm -f $(rm-files)
1515
1516 # Run depmod only if we have System.map and depmod is executable
1517 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1518       cmd_depmod = \
1519         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1520                 $(DEPMOD) -ae -F System.map                                     \
1521                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1522                 $(KERNELRELEASE);                                               \
1523         fi
1524
1525 # Create temporary dir for module support files
1526 # clean it up only when building all modules
1527 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1528                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1529
1530 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1531           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1532           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1533
1534 quiet_cmd_as_o_S = AS      $@
1535 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1536
1537 # read all saved command lines
1538
1539 targets := $(wildcard $(sort $(targets)))
1540 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1541
1542 ifneq ($(cmd_files),)
1543   $(cmd_files): ;       # Do not try to update included dependency files
1544   include $(cmd_files)
1545 endif
1546
1547 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1548 # Usage:
1549 # $(Q)$(MAKE) $(clean)=dir
1550 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1551
1552 endif   # skip-makefile
1553
1554 PHONY += FORCE
1555 FORCE:
1556
1557 # Declare the contents of the .PHONY variable as phony.  We keep that
1558 # information in a variable so we can use it in if_changed and friends.
1559 .PHONY: $(PHONY)