Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 34
   4 EXTRAVERSION = .14
   5 NAME = Sheep on Meth
   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 := $(O)
 103 endif
 104
 105 ifeq ("$(origin W)", "command line")
 106   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 107 endif
 108
 109 # That's our default target when none is given on the command line
 110 PHONY := _all
 111 _all:
 112
 113 # Cancel implicit rules on top Makefile
 114 $(CURDIR)/Makefile Makefile: ;
 115
 116 ifneq ($(KBUILD_OUTPUT),)
 117 # Invoke a second make in the output directory, passing relevant variables
 118 # check that the output directory actually exists
 119 saved-output := $(KBUILD_OUTPUT)
 120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121 $(if $(KBUILD_OUTPUT),, \
 122      $(error output directory "$(saved-output)" does not exist))
 123
 124 PHONY += $(MAKECMDGOALS) sub-make
 125
 126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127         $(Q)@:
 128
 129 sub-make: FORCE
 130         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131         KBUILD_SRC=$(CURDIR) \
 132         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133         $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135 # Leave processing to above invocation of make
 136 skip-makefile := 1
 137 endif # ifneq ($(KBUILD_OUTPUT),)
 138 endif # ifeq ($(KBUILD_SRC),)
 139
 140 # We process the rest of the Makefile if this is the final invocation of make
 141 ifeq ($(skip-makefile),)
 142
 143 # If building an external module we do not care about the all: rule
 144 # but instead _all depend on modules
 145 PHONY += all
 146 ifeq ($(KBUILD_EXTMOD),)
 147 _all: all
 148 else
 149 _all: modules
 150 endif
 151
 152 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH
 160
 161
 162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 163 # first, and if a usermode build is happening, the "ARCH=um" on the command
 164 # line overrides the setting of ARCH below.  If a native build is happening,
 165 # then ARCH is assigned, getting whatever value it gets normally, and
 166 # SUBARCH is subsequently ignored.
 167
 168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                   -e s/sh[234].*/sh/ )
 173
 174 # Cross compiling and selecting different set of gcc/bin-utils
 175 # ---------------------------------------------------------------------------
 176 #
 177 # When performing cross compilation for other architectures ARCH shall be set
 178 # to the target architecture. (See arch/* for the possibilities).
 179 # ARCH can be set during invocation of make:
 180 # make ARCH=ia64
 181 # Another way is to have ARCH set in the environment.
 182 # The default ARCH is the host where make is executed.
 183
 184 # CROSS_COMPILE specify the prefix used for all executables used
 185 # during compilation. Only gcc and related bin-utils executables
 186 # are prefixed with $(CROSS_COMPILE).
 187 # CROSS_COMPILE can be set on the command line
 188 # make CROSS_COMPILE=ia64-linux-
 189 # Alternatively CROSS_COMPILE can be set in the environment.
 190 # Default value for CROSS_COMPILE is not to prefix executables
 191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192 export KBUILD_BUILDHOST := $(SUBARCH)
 193 ARCH            ?= $(SUBARCH)
 194 CROSS_COMPILE   ?=
 195
 196 # Architecture as present in compile.h
 197 UTS_MACHINE     := $(ARCH)
 198 SRCARCH         := $(ARCH)
 199
 200 # Additional ARCH settings for x86
 201 ifeq ($(ARCH),i386)
 202         SRCARCH := x86
 203 endif
 204 ifeq ($(ARCH),x86_64)
 205         SRCARCH := x86
 206 endif
 207
 208 # Additional ARCH settings for sparc
 209 ifeq ($(ARCH),sparc64)
 210        SRCARCH := sparc
 211 endif
 212
 213 # Additional ARCH settings for sh
 214 ifeq ($(ARCH),sh64)
 215        SRCARCH := sh
 216 endif
 217
 218 # Where to locate arch specific headers
 219 hdr-arch  := $(SRCARCH)
 220
 221 ifeq ($(ARCH),m68knommu)
 222        hdr-arch  := m68k
 223 endif
 224
 225 KCONFIG_CONFIG  ?= .config
 226
 227 # SHELL used by kbuild
 228 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 229           else if [ -x /bin/bash ]; then echo /bin/bash; \
 230           else echo sh; fi ; fi)
 231
 232 HOSTCC       = gcc
 233 HOSTCXX      = g++
 234 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 235 HOSTCXXFLAGS = -O2
 236
 237 # Decide whether to build built-in, modular, or both.
 238 # Normally, just do built-in.
 239
 240 KBUILD_MODULES :=
 241 KBUILD_BUILTIN := 1
 242
 243 #       If we have only "make modules", don't compile built-in objects.
 244 #       When we're building modules with modversions, we need to consider
 245 #       the built-in objects during the descend as well, in order to
 246 #       make sure the checksums are up to date before we record them.
 247
 248 ifeq ($(MAKECMDGOALS),modules)
 249   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 250 endif
 251
 252 #       If we have "make <whatever> modules", compile modules
 253 #       in addition to whatever we do anyway.
 254 #       Just "make" or "make all" shall build modules as well
 255
 256 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 257   KBUILD_MODULES := 1
 258 endif
 259
 260 ifeq ($(MAKECMDGOALS),)
 261   KBUILD_MODULES := 1
 262 endif
 263
 264 export KBUILD_MODULES KBUILD_BUILTIN
 265 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 266
 267 # Beautify output
 268 # ---------------------------------------------------------------------------
 269 #
 270 # Normally, we echo the whole command before executing it. By making
 271 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 272 # $(quiet) to choose other forms of output instead, e.g.
 273 #
 274 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 275 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 276 #
 277 # If $(quiet) is empty, the whole command will be printed.
 278 # If it is set to "quiet_", only the short version will be printed.
 279 # If it is set to "silent_", nothing will be printed at all, since
 280 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 281 #
 282 # A simple variant is to prefix commands with $(Q) - that's useful
 283 # for commands that shall be hidden in non-verbose mode.
 284 #
 285 #       $(Q)ln $@ :<
 286 #
 287 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 288 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 289
 290 ifeq ($(KBUILD_VERBOSE),1)
 291   quiet =
 292   Q =
 293 else
 294   quiet=quiet_
 295   Q = @
 296 endif
 297
 298 # If the user is running make -s (silent mode), suppress echoing of
 299 # commands
 300
 301 ifneq ($(findstring s,$(MAKEFLAGS)),)
 302   quiet=silent_
 303 endif
 304
 305 export quiet Q KBUILD_VERBOSE
 306
 307
 308 # Look for make include files relative to root of kernel src
 309 MAKEFLAGS += --include-dir=$(srctree)
 310
 311 # We need some generic definitions (do not try to remake the file).
 312 $(srctree)/scripts/Kbuild.include: ;
 313 include $(srctree)/scripts/Kbuild.include
 314
 315 # Make variables (CC, etc...)
 316
 317 AS              = $(CROSS_COMPILE)as
 318 LD              = $(CROSS_COMPILE)ld
 319 CC              = $(CROSS_COMPILE)gcc
 320 CPP             = $(CC) -E
 321 AR              = $(CROSS_COMPILE)ar
 322 NM              = $(CROSS_COMPILE)nm
 323 STRIP           = $(CROSS_COMPILE)strip
 324 OBJCOPY         = $(CROSS_COMPILE)objcopy
 325 OBJDUMP         = $(CROSS_COMPILE)objdump
 326 AWK             = awk
 327 GENKSYMS        = scripts/genksyms/genksyms
 328 INSTALLKERNEL  := installkernel
 329 DEPMOD          = /sbin/depmod
 330 KALLSYMS        = scripts/kallsyms
 331 PERL            = perl
 332 CHECK           = sparse
 333
 334 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 335                   -Wbitwise -Wno-return-void $(CF)
 336 MODFLAGS        = -DMODULE
 337 CFLAGS_MODULE   = $(MODFLAGS)
 338 AFLAGS_MODULE   = $(MODFLAGS)
 339 LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 340 CFLAGS_KERNEL   =
 341 AFLAGS_KERNEL   =
 342 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 343
 344
 345 # Use LINUXINCLUDE when you must reference the include/ directory.
 346 # Needed to be compatible with the O= option
 347 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 348                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 349                    -include include/generated/autoconf.h
 350
 351 KBUILD_CPPFLAGS := -D__KERNEL__
 352
 353 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 354                    -fno-strict-aliasing -fno-common \
 355                    -Werror-implicit-function-declaration \
 356                    -Wno-format-security \
 357                    -fno-delete-null-pointer-checks
 358 KBUILD_AFLAGS   := -D__ASSEMBLY__
 359
 360 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 361 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 362 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 363
 364 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 365 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 366 export CPP AR NM STRIP OBJCOPY OBJDUMP
 367 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 368 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 369
 370 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 371 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 372 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 373
 374 # When compiling out-of-tree modules, put MODVERDIR in the module
 375 # tree rather than in the kernel tree. The kernel tree might
 376 # even be read-only.
 377 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 378
 379 # Files to ignore in find ... statements
 380
 381 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
 382 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 383
 384 # ===========================================================================
 385 # Rules shared between *config targets and build targets
 386
 387 # Basic helpers built in scripts/
 388 PHONY += scripts_basic
 389 scripts_basic:
 390         $(Q)$(MAKE) $(build)=scripts/basic
 391         $(Q)rm -f .tmp_quiet_recordmcount
 392
 393 # To avoid any implicit rule to kick in, define an empty command.
 394 scripts/basic/%: scripts_basic ;
 395
 396 PHONY += outputmakefile
 397 # outputmakefile generates a Makefile in the output directory, if using a
 398 # separate output directory. This allows convenient use of make in the
 399 # output directory.
 400 outputmakefile:
 401 ifneq ($(KBUILD_SRC),)
 402         $(Q)ln -fsn $(srctree) source
 403         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 404             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 405 endif
 406
 407 # To make sure we do not include .config for any of the *config targets
 408 # catch them early, and hand them over to scripts/kconfig/Makefile
 409 # It is allowed to specify more targets when calling make, including
 410 # mixing *config targets and build targets.
 411 # For example 'make oldconfig all'.
 412 # Detect when mixed targets is specified, and make a second invocation
 413 # of make so .config is not included in this case either (for *config).
 414
 415 no-dot-config-targets := clean mrproper distclean \
 416                          cscope TAGS tags help %docs check% \
 417                          include/linux/version.h headers_% \
 418                          kernelrelease kernelversion
 419
 420 config-targets := 0
 421 mixed-targets  := 0
 422 dot-config     := 1
 423
 424 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 425         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 426                 dot-config := 0
 427         endif
 428 endif
 429
 430 ifeq ($(KBUILD_EXTMOD),)
 431         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 432                 config-targets := 1
 433                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 434                         mixed-targets := 1
 435                 endif
 436         endif
 437 endif
 438
 439 ifeq ($(mixed-targets),1)
 440 # ===========================================================================
 441 # We're called with mixed targets (*config and build targets).
 442 # Handle them one by one.
 443
 444 %:: FORCE
 445         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 446
 447 else
 448 ifeq ($(config-targets),1)
 449 # ===========================================================================
 450 # *config targets only - make sure prerequisites are updated, and descend
 451 # in scripts/kconfig to make the *config target
 452
 453 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 454 # KBUILD_DEFCONFIG may point out an alternative default configuration
 455 # used for 'make defconfig'
 456 include $(srctree)/arch/$(SRCARCH)/Makefile
 457 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 458
 459 config: scripts_basic outputmakefile FORCE
 460         $(Q)mkdir -p include/linux include/config
 461         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 462
 463 %config: scripts_basic outputmakefile FORCE
 464         $(Q)mkdir -p include/linux include/config
 465         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 466
 467 else
 468 # ===========================================================================
 469 # Build targets only - this includes vmlinux, arch specific targets, clean
 470 # targets and others. In general all targets except *config targets.
 471
 472 ifeq ($(KBUILD_EXTMOD),)
 473 # Additional helpers built in scripts/
 474 # Carefully list dependencies so we do not try to build scripts twice
 475 # in parallel
 476 PHONY += scripts
 477 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 478         $(Q)$(MAKE) $(build)=$(@)
 479
 480 # Objects we will link into vmlinux / subdirs we need to visit
 481 init-y          := init/
 482 drivers-y       := drivers/ sound/ firmware/
 483 net-y           := net/
 484 libs-y          := lib/
 485 core-y          := usr/
 486 endif # KBUILD_EXTMOD
 487
 488 ifeq ($(dot-config),1)
 489 # Read in config
 490 -include include/config/auto.conf
 491
 492 ifeq ($(KBUILD_EXTMOD),)
 493 # Read in dependencies to all Kconfig* files, make sure to run
 494 # oldconfig if changes are detected.
 495 -include include/config/auto.conf.cmd
 496
 497 # To avoid any implicit rule to kick in, define an empty command
 498 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 499
 500 # If .config is newer than include/config/auto.conf, someone tinkered
 501 # with it and forgot to run make oldconfig.
 502 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 503 # we execute the config step to be sure to catch updated Kconfig files
 504 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 505         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 506 else
 507 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 508 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 509 PHONY += include/config/auto.conf
 510
 511 include/config/auto.conf:
 512         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 513         echo;                                                           \
 514         echo "  ERROR: Kernel configuration is invalid.";               \
 515         echo "         include/generated/autoconf.h or $@ are missing.";\
 516         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 517         echo;                                                           \
 518         /bin/false)
 519
 520 endif # KBUILD_EXTMOD
 521
 522 else
 523 # Dummy target needed, because used as prerequisite
 524 include/config/auto.conf: ;
 525 endif # $(dot-config)
 526
 527 # The all: target is the default when no target is given on the
 528 # command line.
 529 # This allow a user to issue only 'make' to build a kernel including modules
 530 # Defaults vmlinux but it is usually overridden in the arch makefile
 531 all: vmlinux
 532
 533 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 534 KBUILD_CFLAGS   += -Os
 535 else
 536 KBUILD_CFLAGS   += -O2
 537 endif
 538
 539 include $(srctree)/arch/$(SRCARCH)/Makefile
 540
 541 ifneq ($(CONFIG_FRAME_WARN),0)
 542 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 543 endif
 544
 545 # Force gcc to behave correct even for buggy distributions
 546 ifndef CONFIG_CC_STACKPROTECTOR
 547 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 548 endif
 549
 550 # This warning generated too much noise in a regular build.
 551 # Use make W=1 to enable this warning (see scripts/Makefile.build)
 552 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 553
 554 ifdef CONFIG_FRAME_POINTER
 555 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 556 else
 557 KBUILD_CFLAGS   += -fomit-frame-pointer
 558 endif
 559
 560 ifdef CONFIG_DEBUG_INFO
 561 KBUILD_CFLAGS   += -g
 562 KBUILD_AFLAGS   += -gdwarf-2
 563 endif
 564
 565 ifdef CONFIG_FUNCTION_TRACER
 566 KBUILD_CFLAGS   += -pg
 567 endif
 568
 569 # We trigger additional mismatches with less inlining
 570 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 571 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 572 endif
 573
 574 # arch Makefile may override CC so keep this after arch Makefile is included
 575 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 576 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 577
 578 # warn about C99 declaration after statement
 579 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 580
 581 # disable pointer signed / unsigned warnings in gcc 4.0
 582 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 583
 584 # disable invalid "can't wrap" optimizations for signed / pointers
 585 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 586
 587 # revert to pre-gcc-4.4 behaviour of .eh_frame
 588 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 589
 590 # conserve stack if available
 591 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 592
 593 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 594 # But warn user when we do so
 595 warn-assign = \
 596 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 597
 598 ifneq ($(KCPPFLAGS),)
 599         $(call warn-assign,CPPFLAGS)
 600         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 601 endif
 602 ifneq ($(KAFLAGS),)
 603         $(call warn-assign,AFLAGS)
 604         KBUILD_AFLAGS += $(KAFLAGS)
 605 endif
 606 ifneq ($(KCFLAGS),)
 607         $(call warn-assign,CFLAGS)
 608         KBUILD_CFLAGS += $(KCFLAGS)
 609 endif
 610
 611 # Use --build-id when available.
 612 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 613                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 614 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 615 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 616
 617 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 618 LDFLAGS_vmlinux += $(call ld-option, -X,)
 619 endif
 620
 621 # Default kernel image to build when no specific target is given.
 622 # KBUILD_IMAGE may be overruled on the command line or
 623 # set in the environment
 624 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 625 # this default value
 626 export KBUILD_IMAGE ?= vmlinux
 627
 628 #
 629 # INSTALL_PATH specifies where to place the updated kernel and system map
 630 # images. Default is /boot, but you can set it to other values
 631 export  INSTALL_PATH ?= /boot
 632
 633 #
 634 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 635 # relocations required by build roots.  This is not defined in the
 636 # makefile but the argument can be passed to make if needed.
 637 #
 638
 639 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 640 export MODLIB
 641
 642 #
 643 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 644 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 645 #  the default option --strip-debug will be used.  Otherwise,
 646 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 647
 648 ifdef INSTALL_MOD_STRIP
 649 ifeq ($(INSTALL_MOD_STRIP),1)
 650 mod_strip_cmd = $(STRIP) --strip-debug
 651 else
 652 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 653 endif # INSTALL_MOD_STRIP=1
 654 else
 655 mod_strip_cmd = true
 656 endif # INSTALL_MOD_STRIP
 657 export mod_strip_cmd
 658
 659
 660 ifeq ($(KBUILD_EXTMOD),)
 661 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 662
 663 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 664                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 665                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 666
 667 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 668                      $(init-n) $(init-) \
 669                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 670                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 671
 672 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 673 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 674 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 675 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 676 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 677 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 678 libs-y          := $(libs-y1) $(libs-y2)
 679
 680 # Build vmlinux
 681 # ---------------------------------------------------------------------------
 682 # vmlinux is built from the objects selected by $(vmlinux-init) and
 683 # $(vmlinux-main). Most are built-in.o files from top-level directories
 684 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 685 # Ordering when linking is important, and $(vmlinux-init) must be first.
 686 #
 687 # vmlinux
 688 #   ^
 689 #   |
 690 #   +-< $(vmlinux-init)
 691 #   |   +--< init/version.o + more
 692 #   |
 693 #   +--< $(vmlinux-main)
 694 #   |    +--< driver/built-in.o mm/built-in.o + more
 695 #   |
 696 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 697 #
 698 # vmlinux version (uname -v) cannot be updated during normal
 699 # descending-into-subdirs phase since we do not yet know if we need to
 700 # update vmlinux.
 701 # Therefore this step is delayed until just before final link of vmlinux -
 702 # except in the kallsyms case where it is done just before adding the
 703 # symbols to the kernel.
 704 #
 705 # System.map is generated to document addresses of all kernel symbols
 706
 707 vmlinux-init := $(head-y) $(init-y)
 708 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 709 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 710 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 711 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 712
 713 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 714 # May be overridden by arch/$(ARCH)/Makefile
 715 quiet_cmd_vmlinux__ ?= LD      $@
 716       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 717       -T $(vmlinux-lds) $(vmlinux-init)                          \
 718       --start-group $(vmlinux-main) --end-group                  \
 719       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 720
 721 # Generate new vmlinux version
 722 quiet_cmd_vmlinux_version = GEN     .version
 723       cmd_vmlinux_version = set -e;                     \
 724         if [ ! -r .version ]; then                      \
 725           rm -f .version;                               \
 726           echo 1 >.version;                             \
 727         else                                            \
 728           mv .version .old_version;                     \
 729           expr 0$$(cat .old_version) + 1 >.version;     \
 730         fi;                                             \
 731         $(MAKE) $(build)=init
 732
 733 # Generate System.map
 734 quiet_cmd_sysmap = SYSMAP
 735       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 736
 737 # Link of vmlinux
 738 # If CONFIG_KALLSYMS is set .version is already updated
 739 # Generate System.map and verify that the content is consistent
 740 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 741 # First command is ':' to allow us to use + in front of the rule
 742 define rule_vmlinux__
 743         :
 744         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 745
 746         $(call cmd,vmlinux__)
 747         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 748
 749         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 750           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 751         $(cmd_sysmap) $@ System.map;                                         \
 752         if [ $$? -ne 0 ]; then                                               \
 753                 rm -f $@;                                                    \
 754                 /bin/false;                                                  \
 755         fi;
 756         $(verify_kallsyms)
 757 endef
 758
 759
 760 ifdef CONFIG_KALLSYMS
 761 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 762 # It's a three stage process:
 763 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 764 #   empty
 765 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 766 #   the right size - vmlinux version (uname -v) is updated during this step
 767 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 768 #   but due to the added section, some addresses have shifted.
 769 #   From here, we generate a correct .tmp_kallsyms2.o
 770 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 771 # o Verify that the System.map from vmlinux matches the map from
 772 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 773 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 774 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 775 #   temporary bypass to allow the kernel to be built while the
 776 #   maintainers work out what went wrong with kallsyms.
 777
 778 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 779 last_kallsyms := 3
 780 else
 781 last_kallsyms := 2
 782 endif
 783
 784 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 785
 786 define verify_kallsyms
 787         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 788           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 789           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 790         $(Q)cmp -s System.map .tmp_System.map ||                             \
 791                 (echo Inconsistent kallsyms data;                            \
 792                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 793                  rm .tmp_kallsyms* ; /bin/false )
 794 endef
 795
 796 # Update vmlinux version before link
 797 # Use + in front of this rule to silent warning about make -j1
 798 # First command is ':' to allow us to use + in front of this rule
 799 cmd_ksym_ld = $(cmd_vmlinux__)
 800 define rule_ksym_ld
 801         :
 802         +$(call cmd,vmlinux_version)
 803         $(call cmd,vmlinux__)
 804         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 805 endef
 806
 807 # Generate .S file with all kernel symbols
 808 quiet_cmd_kallsyms = KSYM    $@
 809       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 810                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 811
 812 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 813         $(call if_changed_dep,as_o_S)
 814
 815 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 816         $(call cmd,kallsyms)
 817
 818 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 819 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 820         $(call if_changed_rule,ksym_ld)
 821
 822 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 823         $(call if_changed,vmlinux__)
 824
 825 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 826         $(call if_changed,vmlinux__)
 827
 828 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 829 $(KALLSYMS): scripts ;
 830
 831 # Generate some data for debugging strange kallsyms problems
 832 debug_kallsyms: .tmp_map$(last_kallsyms)
 833
 834 .tmp_map%: .tmp_vmlinux% FORCE
 835         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 836
 837 .tmp_map3: .tmp_map2
 838
 839 .tmp_map2: .tmp_map1
 840
 841 endif # ifdef CONFIG_KALLSYMS
 842
 843 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 844 # relevant sections renamed as per the linker script.
 845 quiet_cmd_vmlinux-modpost = LD      $@
 846       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 847          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 848          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 849 define rule_vmlinux-modpost
 850         :
 851         +$(call cmd,vmlinux-modpost)
 852         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 853         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 854 endef
 855
 856 # vmlinux image - including updated kernel symbols
 857 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 858 ifdef CONFIG_HEADERS_CHECK
 859         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 860 endif
 861 ifdef CONFIG_SAMPLES
 862         $(Q)$(MAKE) $(build)=samples
 863 endif
 864 ifdef CONFIG_BUILD_DOCSRC
 865         $(Q)$(MAKE) $(build)=Documentation
 866 endif
 867         $(call vmlinux-modpost)
 868         $(call if_changed_rule,vmlinux__)
 869         $(Q)rm -f .old_version
 870
 871 # build vmlinux.o first to catch section mismatch errors early
 872 ifdef CONFIG_KALLSYMS
 873 .tmp_vmlinux1: vmlinux.o
 874 endif
 875
 876 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 877 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 878         $(call if_changed_rule,vmlinux-modpost)
 879
 880 # The actual objects are generated when descending,
 881 # make sure no implicit rule kicks in
 882 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 883
 884 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 885 # Preset locale variables to speed up the build process. Limit locale
 886 # tweaks to this spot to avoid wrong language settings when running
 887 # make menuconfig etc.
 888 # Error messages still appears in the original language
 889
 890 PHONY += $(vmlinux-dirs)
 891 $(vmlinux-dirs): prepare scripts
 892         $(Q)$(MAKE) $(build)=$@
 893 ifdef CONFIG_MODULES
 894         $(Q)$(MAKE) $(modbuiltin)=$@
 895 endif
 896
 897 # Build the kernel release string
 898 #
 899 # The KERNELRELEASE value built here is stored in the file
 900 # include/config/kernel.release, and is used when executing several
 901 # make targets, such as "make install" or "make modules_install."
 902 #
 903 # The eventual kernel release string consists of the following fields,
 904 # shown in a hierarchical format to show how smaller parts are concatenated
 905 # to form the larger and final value, with values coming from places like
 906 # the Makefile, kernel config options, make command line options and/or
 907 # SCM tag information.
 908 #
 909 #       $(KERNELVERSION)
 910 #         $(VERSION)                    eg, 2
 911 #         $(PATCHLEVEL)                 eg, 6
 912 #         $(SUBLEVEL)                   eg, 18
 913 #         $(EXTRAVERSION)               eg, -rc6
 914 #       $(localver-full)
 915 #         $(localver)
 916 #           localversion*               (files without backups, containing '~')
 917 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 918 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 919 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 920 #           $(LOCALVERSION)             (from make command line if provided)
 921 #
 922 #  Note how the final $(localver-auto) string is included *only* if the
 923 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 924 # moment, only git is supported but other SCMs can edit the script
 925 # scripts/setlocalversion and add the appropriate checks as needed.
 926
 927 pattern = ".*/localversion[^~]*"
 928 string  = $(shell cat /dev/null \
 929            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 930
 931 localver = $(subst $(space),, $(string) \
 932                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 933
 934 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 935 # and if the SCM is know a tag from the SCM is appended.
 936 # The appended tag is determined by the SCM used.
 937 #
 938 # .scmversion is used when generating rpm packages so we do not loose
 939 # the version information from the SCM when we do the build of the kernel
 940 # from the copied source
 941 ifdef CONFIG_LOCALVERSION_AUTO
 942
 943 ifeq ($(wildcard .scmversion),)
 944         _localver-auto = $(shell $(CONFIG_SHELL) \
 945                          $(srctree)/scripts/setlocalversion $(srctree))
 946 else
 947         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 948 endif
 949
 950         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 951 endif
 952
 953 localver-full = $(localver)$(localver-auto)
 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[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1100         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
1101         @$(kecho) '  Building modules, stage 2.';
1102         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1103         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1104
1105
1106 # Target to prepare building external modules
1107 PHONY += modules_prepare
1108 modules_prepare: prepare scripts
1109
1110 # Target to install modules
1111 PHONY += modules_install
1112 modules_install: _modinst_ _modinst_post
1113
1114 PHONY += _modinst_
1115 _modinst_:
1116         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1117                 echo "Warning: you may need to install module-init-tools"; \
1118                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1119                 sleep 1; \
1120         fi
1121         @rm -rf $(MODLIB)/kernel
1122         @rm -f $(MODLIB)/source
1123         @mkdir -p $(MODLIB)/kernel
1124         @ln -s $(srctree) $(MODLIB)/source
1125         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1126                 rm -f $(MODLIB)/build ; \
1127                 ln -s $(objtree) $(MODLIB)/build ; \
1128         fi
1129         @cp -f $(objtree)/modules.order $(MODLIB)/
1130         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1131         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1132
1133 # This depmod is only for convenience to give the initial
1134 # boot a modules.dep even before / is mounted read-write.  However the
1135 # boot script depmod is the master version.
1136 PHONY += _modinst_post
1137 _modinst_post: _modinst_
1138         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1139         $(call cmd,depmod)
1140
1141 else # CONFIG_MODULES
1142
1143 # Modules not configured
1144 # ---------------------------------------------------------------------------
1145
1146 modules modules_install: FORCE
1147         @echo
1148         @echo "The present kernel configuration has modules disabled."
1149         @echo "Type 'make config' and enable loadable module support."
1150         @echo "Then build a kernel with module support enabled."
1151         @echo
1152         @exit 1
1153
1154 endif # CONFIG_MODULES
1155
1156 ###
1157 # Cleaning is done on three levels.
1158 # make clean     Delete most generated files
1159 #                Leave enough to build external modules
1160 # make mrproper  Delete the current configuration, and all generated files
1161 # make distclean Remove editor backup files, patch leftover files and the like
1162
1163 # Directories & files removed with 'make clean'
1164 CLEAN_DIRS  += $(MODVERDIR)
1165 CLEAN_FILES +=  vmlinux System.map \
1166                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1167
1168 # Directories & files removed with 'make mrproper'
1169 MRPROPER_DIRS  += include/config usr/include include/generated
1170 MRPROPER_FILES += .config .config.old .version .old_version             \
1171                   include/linux/version.h                               \
1172                   Module.symvers tags TAGS cscope*
1173
1174 # clean - Delete most, but leave enough to build external modules
1175 #
1176 clean: rm-dirs  := $(CLEAN_DIRS)
1177 clean: rm-files := $(CLEAN_FILES)
1178 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1179
1180 PHONY += $(clean-dirs) clean archclean
1181 $(clean-dirs):
1182         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1183
1184 clean: archclean $(clean-dirs)
1185         $(call cmd,rmdirs)
1186         $(call cmd,rmfiles)
1187         @find . $(RCS_FIND_IGNORE) \
1188                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1189                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1190                 -o -name '*.symtypes' -o -name 'modules.order' \
1191                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1192                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1193
1194 # mrproper - Delete all generated files, including .config
1195 #
1196 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1197 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1198 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1199
1200 PHONY += $(mrproper-dirs) mrproper archmrproper
1201 $(mrproper-dirs):
1202         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1203
1204 mrproper: clean archmrproper $(mrproper-dirs)
1205         $(call cmd,rmdirs)
1206         $(call cmd,rmfiles)
1207
1208 # distclean
1209 #
1210 PHONY += distclean
1211
1212 distclean: mrproper
1213         @find $(srctree) $(RCS_FIND_IGNORE) \
1214                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1215                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1216                 -o -name '.*.rej' -o -size 0 \
1217                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1218                 -type f -print | xargs rm -f
1219
1220
1221 # Packaging of the kernel to various formats
1222 # ---------------------------------------------------------------------------
1223 # rpm target kept for backward compatibility
1224 package-dir     := $(srctree)/scripts/package
1225
1226 %pkg: include/config/kernel.release FORCE
1227         $(Q)$(MAKE) $(build)=$(package-dir) $@
1228 rpm: include/config/kernel.release FORCE
1229         $(Q)$(MAKE) $(build)=$(package-dir) $@
1230
1231
1232 # Brief documentation of the typical targets used
1233 # ---------------------------------------------------------------------------
1234
1235 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1236 boards := $(notdir $(boards))
1237 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1238 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1239
1240 help:
1241         @echo  'Cleaning targets:'
1242         @echo  '  clean           - Remove most generated files but keep the config and'
1243         @echo  '                    enough build support to build external modules'
1244         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1245         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1246         @echo  ''
1247         @echo  'Configuration targets:'
1248         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1249         @echo  ''
1250         @echo  'Other generic targets:'
1251         @echo  '  all             - Build all targets marked with [*]'
1252         @echo  '* vmlinux         - Build the bare kernel'
1253         @echo  '* modules         - Build all modules'
1254         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1255         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1256         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1257         @echo  '  dir/            - Build all files in dir and below'
1258         @echo  '  dir/file.[ois]  - Build specified target only'
1259         @echo  '  dir/file.ko     - Build module including final link'
1260         @echo  '  modules_prepare - Set up for building external modules'
1261         @echo  '  tags/TAGS       - Generate tags file for editors'
1262         @echo  '  cscope          - Generate cscope index'
1263         @echo  '  kernelrelease   - Output the release version string'
1264         @echo  '  kernelversion   - Output the version stored in Makefile'
1265         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1266          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1267          echo  ''
1268         @echo  'Static analysers'
1269         @echo  '  checkstack      - Generate a list of stack hogs'
1270         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1271         @echo  '  versioncheck    - Sanity check on version.h usage'
1272         @echo  '  includecheck    - Check for duplicate included header files'
1273         @echo  '  export_report   - List the usages of all exported symbols'
1274         @echo  '  headers_check   - Sanity check on exported headers'
1275         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1276          echo  ''
1277         @echo  'Kernel packaging:'
1278         @$(MAKE) $(build)=$(package-dir) help
1279         @echo  ''
1280         @echo  'Documentation targets:'
1281         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1282         @echo  ''
1283         @echo  'Architecture specific targets ($(SRCARCH)):'
1284         @$(if $(archhelp),$(archhelp),\
1285                 echo '  No architecture specific help defined for $(SRCARCH)')
1286         @echo  ''
1287         @$(if $(boards), \
1288                 $(foreach b, $(boards), \
1289                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1290                 echo '')
1291         @$(if $(board-dirs), \
1292                 $(foreach b, $(board-dirs), \
1293                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1294                 printf "  %-16s - Show all of the above\\n" help-boards; \
1295                 echo '')
1296
1297         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1298         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1299         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1300         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1301         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1302         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1303         @echo  '                1: warnings which may be relevant and do not occur too often'
1304         @echo  '                2: warnings which occur quite often but may still be relevant'
1305         @echo  '                3: more obscure warnings, can most likely be ignored'
1306
1307         @echo  ''
1308         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1309         @echo  'For further info see the ./README file'
1310
1311
1312 help-board-dirs := $(addprefix help-,$(board-dirs))
1313
1314 help-boards: $(help-board-dirs)
1315
1316 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1317
1318 $(help-board-dirs): help-%:
1319         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1320         @$(if $(boards-per-dir), \
1321                 $(foreach b, $(boards-per-dir), \
1322                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1323                 echo '')
1324
1325
1326 # Documentation targets
1327 # ---------------------------------------------------------------------------
1328 %docs: scripts_basic FORCE
1329         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1330
1331 else # KBUILD_EXTMOD
1332
1333 ###
1334 # External module support.
1335 # When building external modules the kernel used as basis is considered
1336 # read-only, and no consistency checks are made and the make
1337 # system is not used on the basis kernel. If updates are required
1338 # in the basis kernel ordinary make commands (without M=...) must
1339 # be used.
1340 #
1341 # The following are the only valid targets when building external
1342 # modules.
1343 # make M=dir clean     Delete all automatically generated files
1344 # make M=dir modules   Make all modules in specified dir
1345 # make M=dir           Same as 'make M=dir modules'
1346 # make M=dir modules_install
1347 #                      Install the modules built in the module directory
1348 #                      Assumes install directory is already created
1349
1350 # We are always building modules
1351 KBUILD_MODULES := 1
1352 PHONY += crmodverdir
1353 crmodverdir:
1354         $(cmd_crmodverdir)
1355
1356 PHONY += $(objtree)/Module.symvers
1357 $(objtree)/Module.symvers:
1358         @test -e $(objtree)/Module.symvers || ( \
1359         echo; \
1360         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1361         echo "           is missing; modules will have no dependencies and modversions."; \
1362         echo )
1363
1364 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1365 PHONY += $(module-dirs) modules
1366 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1367         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1368
1369 modules: $(module-dirs)
1370         @$(kecho) '  Building modules, stage 2.';
1371         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1372
1373 PHONY += modules_install
1374 modules_install: _emodinst_ _emodinst_post
1375
1376 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1377 PHONY += _emodinst_
1378 _emodinst_:
1379         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1380         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1381
1382 PHONY += _emodinst_post
1383 _emodinst_post: _emodinst_
1384         $(call cmd,depmod)
1385
1386 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1387
1388 PHONY += $(clean-dirs) clean
1389 $(clean-dirs):
1390         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1391
1392 clean:  rm-dirs := $(MODVERDIR)
1393 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1394                    $(KBUILD_EXTMOD)/modules.order \
1395                    $(KBUILD_EXTMOD)/modules.builtin
1396 clean: $(clean-dirs)
1397         $(call cmd,rmdirs)
1398         $(call cmd,rmfiles)
1399         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1400                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1401                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1402                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1403
1404 help:
1405         @echo  '  Building external modules.'
1406         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1407         @echo  ''
1408         @echo  '  modules         - default target, build the module(s)'
1409         @echo  '  modules_install - install the module'
1410         @echo  '  clean           - remove generated files in module directory only'
1411         @echo  ''
1412
1413 # Dummies...
1414 PHONY += prepare scripts
1415 prepare: ;
1416 scripts: ;
1417 endif # KBUILD_EXTMOD
1418
1419 # Generate tags for editors
1420 # ---------------------------------------------------------------------------
1421 quiet_cmd_tags = GEN     $@
1422       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1423
1424 tags TAGS cscope: FORCE
1425         $(call cmd,tags)
1426
1427 # Scripts to check various things for consistency
1428 # ---------------------------------------------------------------------------
1429
1430 includecheck:
1431         find * $(RCS_FIND_IGNORE) \
1432                 -name '*.[hcS]' -type f -print | sort \
1433                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1434
1435 versioncheck:
1436         find * $(RCS_FIND_IGNORE) \
1437                 -name '*.[hcS]' -type f -print | sort \
1438                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1439
1440 namespacecheck:
1441         $(PERL) $(srctree)/scripts/namespace.pl
1442
1443 export_report:
1444         $(PERL) $(srctree)/scripts/export_report.pl
1445
1446 endif #ifeq ($(config-targets),1)
1447 endif #ifeq ($(mixed-targets),1)
1448
1449 PHONY += checkstack kernelrelease kernelversion
1450
1451 # UML needs a little special treatment here.  It wants to use the host
1452 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1453 # else wants $(ARCH), including people doing cross-builds, which means
1454 # that $(SUBARCH) doesn't work here.
1455 ifeq ($(ARCH), um)
1456 CHECKSTACK_ARCH := $(SUBARCH)
1457 else
1458 CHECKSTACK_ARCH := $(ARCH)
1459 endif
1460 checkstack:
1461         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1462         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1463
1464 kernelrelease:
1465         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1466         $(error kernelrelease not valid - run 'make prepare' to update it))
1467 kernelversion:
1468         @echo $(KERNELVERSION)
1469
1470 # Single targets
1471 # ---------------------------------------------------------------------------
1472 # Single targets are compatible with:
1473 # - build with mixed source and output
1474 # - build with separate output dir 'make O=...'
1475 # - external modules
1476 #
1477 #  target-dir => where to store outputfile
1478 #  build-dir  => directory in kernel source tree to use
1479
1480 ifeq ($(KBUILD_EXTMOD),)
1481         build-dir  = $(patsubst %/,%,$(dir $@))
1482         target-dir = $(dir $@)
1483 else
1484         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1485         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1486         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1487 endif
1488
1489 %.s: %.c prepare scripts FORCE
1490         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491 %.i: %.c prepare scripts FORCE
1492         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493 %.o: %.c prepare scripts FORCE
1494         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495 %.lst: %.c prepare scripts FORCE
1496         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497 %.s: %.S prepare scripts FORCE
1498         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499 %.o: %.S prepare scripts FORCE
1500         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501 %.symtypes: %.c prepare scripts FORCE
1502         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503
1504 # Modules
1505 /: prepare scripts FORCE
1506         $(cmd_crmodverdir)
1507         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1508         $(build)=$(build-dir)
1509 %/: prepare scripts FORCE
1510         $(cmd_crmodverdir)
1511         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512         $(build)=$(build-dir)
1513 %.ko: prepare scripts FORCE
1514         $(cmd_crmodverdir)
1515         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1516         $(build)=$(build-dir) $(@:.ko=.o)
1517         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1518
1519 # FIXME Should go into a make.lib or something
1520 # ===========================================================================
1521
1522 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1523       cmd_rmdirs = rm -rf $(rm-dirs)
1524
1525 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1526       cmd_rmfiles = rm -f $(rm-files)
1527
1528 # Run depmod only if we have System.map and depmod is executable
1529 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1530       cmd_depmod = \
1531         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1532                 $(DEPMOD) -ae -F System.map                                     \
1533                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1534                 $(KERNELRELEASE);                                               \
1535         fi
1536
1537 # Create temporary dir for module support files
1538 # clean it up only when building all modules
1539 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1540                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1541
1542 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1543           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1544           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1545
1546 quiet_cmd_as_o_S = AS      $@
1547 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1548
1549 # read all saved command lines
1550
1551 targets := $(wildcard $(sort $(targets)))
1552 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1553
1554 ifneq ($(cmd_files),)
1555   $(cmd_files): ;       # Do not try to update included dependency files
1556   include $(cmd_files)
1557 endif
1558
1559 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1560 # Usage:
1561 # $(Q)$(MAKE) $(clean)=dir
1562 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1563
1564 endif   # skip-makefile
1565
1566 PHONY += FORCE
1567 FORCE:
1568
1569 # Declare the contents of the .PHONY variable as phony.  We keep that
1570 # information in a variable so we can use it in if_changed and friends.
1571 .PHONY: $(PHONY)