Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 32
   4 EXTRAVERSION =
   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 # We are using a recursive build, so we need to do a little thinking
  20 # to get the ordering right.
  21 #
  22 # Most importantly: sub-Makefiles should only ever modify files in
  23 # their own directory. If in some directory we have a dependency on
  24 # a file in another dir (which doesn't happen often, but it's often
  25 # unavoidable when linking the built-in.o targets which finally
  26 # turn into vmlinux), we will call a sub make in that other dir, and
  27 # after that we are sure that everything which is in that other dir
  28 # is now up to date.
  29 #
  30 # The only cases where we need to modify files which have global
  31 # effects are thus separated out and done before the recursive
  32 # descending is started. They are now explicitly listed as the
  33 # prepare rule.
  34
  35 # To put more focus on warnings, be less verbose as default
  36 # Use 'make V=1' to see the full commands
  37
  38 ifeq ("$(origin V)", "command line")
  39   KBUILD_VERBOSE = $(V)
  40 endif
  41 ifndef KBUILD_VERBOSE
  42   KBUILD_VERBOSE = 0
  43 endif
  44
  45 # Call a source code checker (by default, "sparse") as part of the
  46 # C compilation.
  47 #
  48 # Use 'make C=1' to enable checking of only re-compiled files.
  49 # Use 'make C=2' to enable checking of *all* source files, regardless
  50 # of whether they are re-compiled or not.
  51 #
  52 # See the file "Documentation/sparse.txt" for more details, including
  53 # where to get the "sparse" utility.
  54
  55 ifeq ("$(origin C)", "command line")
  56   KBUILD_CHECKSRC = $(C)
  57 endif
  58 ifndef KBUILD_CHECKSRC
  59   KBUILD_CHECKSRC = 0
  60 endif
  61
  62 # Use make M=dir to specify directory of external module to build
  63 # Old syntax make ... SUBDIRS=$PWD is still supported
  64 # Setting the environment variable KBUILD_EXTMOD take precedence
  65 ifdef SUBDIRS
  66   KBUILD_EXTMOD ?= $(SUBDIRS)
  67 endif
  68
  69 ifeq ("$(origin M)", "command line")
  70   KBUILD_EXTMOD := $(M)
  71 endif
  72
  73 # kbuild supports saving output files in a separate directory.
  74 # To locate output files in a separate directory two syntaxes are supported.
  75 # In both cases the working directory must be the root of the kernel src.
  76 # 1) O=
  77 # Use "make O=dir/to/store/output/files/"
  78 #
  79 # 2) Set KBUILD_OUTPUT
  80 # Set the environment variable KBUILD_OUTPUT to point to the directory
  81 # where the output files shall be placed.
  82 # export KBUILD_OUTPUT=dir/to/store/output/files/
  83 # make
  84 #
  85 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  86 # variable.
  87
  88
  89 # KBUILD_SRC is set on invocation of make in OBJ directory
  90 # KBUILD_SRC is not intended to be used by the regular user (for now)
  91 ifeq ($(KBUILD_SRC),)
  92
  93 # OK, Make called in directory where kernel src resides
  94 # Do we want to locate output files in a separate directory?
  95 ifeq ("$(origin O)", "command line")
  96   KBUILD_OUTPUT := $(O)
  97 endif
  98
  99 # That's our default target when none is given on the command line
 100 PHONY := _all
 101 _all:
 102
 103 # Cancel implicit rules on top Makefile
 104 $(CURDIR)/Makefile Makefile: ;
 105
 106 ifneq ($(KBUILD_OUTPUT),)
 107 # Invoke a second make in the output directory, passing relevant variables
 108 # check that the output directory actually exists
 109 saved-output := $(KBUILD_OUTPUT)
 110 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 111 $(if $(KBUILD_OUTPUT),, \
 112      $(error output directory "$(saved-output)" does not exist))
 113
 114 PHONY += $(MAKECMDGOALS) sub-make
 115
 116 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 117         $(Q)@:
 118
 119 sub-make: FORCE
 120         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 121         KBUILD_SRC=$(CURDIR) \
 122         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 123         $(filter-out _all sub-make,$(MAKECMDGOALS))
 124
 125 # Leave processing to above invocation of make
 126 skip-makefile := 1
 127 endif # ifneq ($(KBUILD_OUTPUT),)
 128 endif # ifeq ($(KBUILD_SRC),)
 129
 130 # We process the rest of the Makefile if this is the final invocation of make
 131 ifeq ($(skip-makefile),)
 132
 133 # If building an external module we do not care about the all: rule
 134 # but instead _all depend on modules
 135 PHONY += all
 136 ifeq ($(KBUILD_EXTMOD),)
 137 _all: all
 138 else
 139 _all: modules
 140 endif
 141
 142 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 143 objtree         := $(CURDIR)
 144 src             := $(srctree)
 145 obj             := $(objtree)
 146
 147 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 148
 149 export srctree objtree VPATH
 150
 151
 152 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 153 # first, and if a usermode build is happening, the "ARCH=um" on the command
 154 # line overrides the setting of ARCH below.  If a native build is happening,
 155 # then ARCH is assigned, getting whatever value it gets normally, and
 156 # SUBARCH is subsequently ignored.
 157
 158 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 159                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 160                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
 161                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 162                                   -e s/sh[234].*/sh/ )
 163
 164 # Cross compiling and selecting different set of gcc/bin-utils
 165 # ---------------------------------------------------------------------------
 166 #
 167 # When performing cross compilation for other architectures ARCH shall be set
 168 # to the target architecture. (See arch/* for the possibilities).
 169 # ARCH can be set during invocation of make:
 170 # make ARCH=ia64
 171 # Another way is to have ARCH set in the environment.
 172 # The default ARCH is the host where make is executed.
 173
 174 # CROSS_COMPILE specify the prefix used for all executables used
 175 # during compilation. Only gcc and related bin-utils executables
 176 # are prefixed with $(CROSS_COMPILE).
 177 # CROSS_COMPILE can be set on the command line
 178 # make CROSS_COMPILE=ia64-linux-
 179 # Alternatively CROSS_COMPILE can be set in the environment.
 180 # Default value for CROSS_COMPILE is not to prefix executables
 181 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 182 export KBUILD_BUILDHOST := $(SUBARCH)
 183 ARCH            ?= $(SUBARCH)
 184 CROSS_COMPILE   ?=
 185
 186 # Architecture as present in compile.h
 187 UTS_MACHINE     := $(ARCH)
 188 SRCARCH         := $(ARCH)
 189
 190 # Additional ARCH settings for x86
 191 ifeq ($(ARCH),i386)
 192         SRCARCH := x86
 193 endif
 194 ifeq ($(ARCH),x86_64)
 195         SRCARCH := x86
 196 endif
 197
 198 # Additional ARCH settings for sparc
 199 ifeq ($(ARCH),sparc64)
 200        SRCARCH := sparc
 201 endif
 202
 203 # Additional ARCH settings for sh
 204 ifeq ($(ARCH),sh64)
 205        SRCARCH := sh
 206 endif
 207
 208 # Where to locate arch specific headers
 209 hdr-arch  := $(SRCARCH)
 210
 211 ifeq ($(ARCH),m68knommu)
 212        hdr-arch  := m68k
 213 endif
 214
 215 KCONFIG_CONFIG  ?= .config
 216
 217 # SHELL used by kbuild
 218 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 219           else if [ -x /bin/bash ]; then echo /bin/bash; \
 220           else echo sh; fi ; fi)
 221
 222 HOSTCC       = gcc
 223 HOSTCXX      = g++
 224 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 225 HOSTCXXFLAGS = -O2
 226
 227 # Decide whether to build built-in, modular, or both.
 228 # Normally, just do built-in.
 229
 230 KBUILD_MODULES :=
 231 KBUILD_BUILTIN := 1
 232
 233 #       If we have only "make modules", don't compile built-in objects.
 234 #       When we're building modules with modversions, we need to consider
 235 #       the built-in objects during the descend as well, in order to
 236 #       make sure the checksums are up to date before we record them.
 237
 238 ifeq ($(MAKECMDGOALS),modules)
 239   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 240 endif
 241
 242 #       If we have "make <whatever> modules", compile modules
 243 #       in addition to whatever we do anyway.
 244 #       Just "make" or "make all" shall build modules as well
 245
 246 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 247   KBUILD_MODULES := 1
 248 endif
 249
 250 ifeq ($(MAKECMDGOALS),)
 251   KBUILD_MODULES := 1
 252 endif
 253
 254 export KBUILD_MODULES KBUILD_BUILTIN
 255 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 256
 257 # Beautify output
 258 # ---------------------------------------------------------------------------
 259 #
 260 # Normally, we echo the whole command before executing it. By making
 261 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 262 # $(quiet) to choose other forms of output instead, e.g.
 263 #
 264 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 265 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 266 #
 267 # If $(quiet) is empty, the whole command will be printed.
 268 # If it is set to "quiet_", only the short version will be printed.
 269 # If it is set to "silent_", nothing will be printed at all, since
 270 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 271 #
 272 # A simple variant is to prefix commands with $(Q) - that's useful
 273 # for commands that shall be hidden in non-verbose mode.
 274 #
 275 #       $(Q)ln $@ :<
 276 #
 277 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 278 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 279
 280 ifeq ($(KBUILD_VERBOSE),1)
 281   quiet =
 282   Q =
 283 else
 284   quiet=quiet_
 285   Q = @
 286 endif
 287
 288 # If the user is running make -s (silent mode), suppress echoing of
 289 # commands
 290
 291 ifneq ($(findstring s,$(MAKEFLAGS)),)
 292   quiet=silent_
 293 endif
 294
 295 export quiet Q KBUILD_VERBOSE
 296
 297
 298 # Look for make include files relative to root of kernel src
 299 MAKEFLAGS += --include-dir=$(srctree)
 300
 301 # We need some generic definitions (do not try to remake the file).
 302 $(srctree)/scripts/Kbuild.include: ;
 303 include $(srctree)/scripts/Kbuild.include
 304
 305 # Make variables (CC, etc...)
 306
 307 AS              = $(CROSS_COMPILE)as
 308 LD              = $(CROSS_COMPILE)ld
 309 CC              = $(CROSS_COMPILE)gcc
 310 CPP             = $(CC) -E
 311 AR              = $(CROSS_COMPILE)ar
 312 NM              = $(CROSS_COMPILE)nm
 313 STRIP           = $(CROSS_COMPILE)strip
 314 OBJCOPY         = $(CROSS_COMPILE)objcopy
 315 OBJDUMP         = $(CROSS_COMPILE)objdump
 316 AWK             = awk
 317 GENKSYMS        = scripts/genksyms/genksyms
 318 INSTALLKERNEL  := installkernel
 319 DEPMOD          = /sbin/depmod
 320 KALLSYMS        = scripts/kallsyms
 321 PERL            = perl
 322 CHECK           = sparse
 323
 324 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 325                   -Wbitwise -Wno-return-void $(CF)
 326 MODFLAGS        = -DMODULE
 327 CFLAGS_MODULE   = $(MODFLAGS)
 328 AFLAGS_MODULE   = $(MODFLAGS)
 329 LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 330 CFLAGS_KERNEL   =
 331 AFLAGS_KERNEL   =
 332 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 333
 334
 335 # Use LINUXINCLUDE when you must reference the include/ directory.
 336 # Needed to be compatible with the O= option
 337 LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 338                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
 339                    -include include/generated/autoconf.h
 340
 341 KBUILD_CPPFLAGS := -D__KERNEL__
 342
 343 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 344                    -fno-strict-aliasing -fno-common \
 345                    -Werror-implicit-function-declaration \
 346                    -Wno-format-security \
 347                    -fno-delete-null-pointer-checks
 348 KBUILD_AFLAGS   := -D__ASSEMBLY__
 349
 350 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 351 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 352 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 353
 354 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 355 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 356 export CPP AR NM STRIP OBJCOPY OBJDUMP
 357 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 358 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 359
 360 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 361 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 362 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 363
 364 # When compiling out-of-tree modules, put MODVERDIR in the module
 365 # tree rather than in the kernel tree. The kernel tree might
 366 # even be read-only.
 367 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 368
 369 # Files to ignore in find ... statements
 370
 371 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
 372 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 373
 374 # ===========================================================================
 375 # Rules shared between *config targets and build targets
 376
 377 # Basic helpers built in scripts/
 378 PHONY += scripts_basic
 379 scripts_basic:
 380         $(Q)$(MAKE) $(build)=scripts/basic
 381         $(Q)rm -f .tmp_quiet_recordmcount
 382
 383 # To avoid any implicit rule to kick in, define an empty command.
 384 scripts/basic/%: scripts_basic ;
 385
 386 PHONY += outputmakefile
 387 # outputmakefile generates a Makefile in the output directory, if using a
 388 # separate output directory. This allows convenient use of make in the
 389 # output directory.
 390 outputmakefile:
 391 ifneq ($(KBUILD_SRC),)
 392         $(Q)ln -fsn $(srctree) source
 393         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 394             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 395 endif
 396
 397 # To make sure we do not include .config for any of the *config targets
 398 # catch them early, and hand them over to scripts/kconfig/Makefile
 399 # It is allowed to specify more targets when calling make, including
 400 # mixing *config targets and build targets.
 401 # For example 'make oldconfig all'.
 402 # Detect when mixed targets is specified, and make a second invocation
 403 # of make so .config is not included in this case either (for *config).
 404
 405 no-dot-config-targets := clean mrproper distclean \
 406                          cscope TAGS tags help %docs check% \
 407                          include/linux/version.h headers_% \
 408                          kernelrelease kernelversion
 409
 410 config-targets := 0
 411 mixed-targets  := 0
 412 dot-config     := 1
 413
 414 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 415         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 416                 dot-config := 0
 417         endif
 418 endif
 419
 420 ifeq ($(KBUILD_EXTMOD),)
 421         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 422                 config-targets := 1
 423                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 424                         mixed-targets := 1
 425                 endif
 426         endif
 427 endif
 428
 429 ifeq ($(mixed-targets),1)
 430 # ===========================================================================
 431 # We're called with mixed targets (*config and build targets).
 432 # Handle them one by one.
 433
 434 %:: FORCE
 435         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 436
 437 else
 438 ifeq ($(config-targets),1)
 439 # ===========================================================================
 440 # *config targets only - make sure prerequisites are updated, and descend
 441 # in scripts/kconfig to make the *config target
 442
 443 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 444 # KBUILD_DEFCONFIG may point out an alternative default configuration
 445 # used for 'make defconfig'
 446 include $(srctree)/arch/$(SRCARCH)/Makefile
 447 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 448
 449 config: scripts_basic outputmakefile FORCE
 450         $(Q)mkdir -p include/linux include/config
 451         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 452
 453 %config: scripts_basic outputmakefile FORCE
 454         $(Q)mkdir -p include/linux include/config
 455         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 456
 457 else
 458 # ===========================================================================
 459 # Build targets only - this includes vmlinux, arch specific targets, clean
 460 # targets and others. In general all targets except *config targets.
 461
 462 ifeq ($(KBUILD_EXTMOD),)
 463 # Additional helpers built in scripts/
 464 # Carefully list dependencies so we do not try to build scripts twice
 465 # in parallel
 466 PHONY += scripts
 467 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 468         $(Q)$(MAKE) $(build)=$(@)
 469
 470 # Objects we will link into vmlinux / subdirs we need to visit
 471 init-y          := init/
 472 drivers-y       := drivers/ sound/ firmware/
 473 net-y           := net/
 474 libs-y          := lib/
 475 core-y          := usr/
 476 endif # KBUILD_EXTMOD
 477
 478 ifeq ($(dot-config),1)
 479 # Read in config
 480 -include include/config/auto.conf
 481
 482 ifeq ($(KBUILD_EXTMOD),)
 483 # Read in dependencies to all Kconfig* files, make sure to run
 484 # oldconfig if changes are detected.
 485 -include include/config/auto.conf.cmd
 486
 487 # To avoid any implicit rule to kick in, define an empty command
 488 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 489
 490 # If .config is newer than include/config/auto.conf, someone tinkered
 491 # with it and forgot to run make oldconfig.
 492 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 493 # we execute the config step to be sure to catch updated Kconfig files
 494 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 495         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 496 else
 497 # external modules needs include/generated/autoconf.h and include/config/auto.conf
 498 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 499 PHONY += include/config/auto.conf
 500
 501 include/config/auto.conf:
 502         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 503         echo;                                                           \
 504         echo "  ERROR: Kernel configuration is invalid.";               \
 505         echo "         include/generated/autoconf.h or $@ are missing.";\
 506         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 507         echo;                                                           \
 508         /bin/false)
 509
 510 endif # KBUILD_EXTMOD
 511
 512 else
 513 # Dummy target needed, because used as prerequisite
 514 include/config/auto.conf: ;
 515 endif # $(dot-config)
 516
 517 # The all: target is the default when no target is given on the
 518 # command line.
 519 # This allow a user to issue only 'make' to build a kernel including modules
 520 # Defaults vmlinux but it is usually overridden in the arch makefile
 521 all: vmlinux
 522
 523 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 524 KBUILD_CFLAGS   += -Os
 525 else
 526 KBUILD_CFLAGS   += -O2
 527 endif
 528
 529 include $(srctree)/arch/$(SRCARCH)/Makefile
 530
 531 ifneq ($(CONFIG_FRAME_WARN),0)
 532 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 533 endif
 534
 535 # Force gcc to behave correct even for buggy distributions
 536 ifndef CONFIG_CC_STACKPROTECTOR
 537 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 538 endif
 539
 540 ifdef CONFIG_FRAME_POINTER
 541 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 542 else
 543 KBUILD_CFLAGS   += -fomit-frame-pointer
 544 endif
 545
 546 ifdef CONFIG_DEBUG_INFO
 547 KBUILD_CFLAGS   += -g
 548 KBUILD_AFLAGS   += -gdwarf-2
 549 endif
 550
 551 ifdef CONFIG_FUNCTION_TRACER
 552 KBUILD_CFLAGS   += -pg
 553 endif
 554
 555 # We trigger additional mismatches with less inlining
 556 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 557 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 558 endif
 559
 560 # arch Makefile may override CC so keep this after arch Makefile is included
 561 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 562 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 563
 564 # warn about C99 declaration after statement
 565 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 566
 567 # disable pointer signed / unsigned warnings in gcc 4.0
 568 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 569
 570 # disable invalid "can't wrap" optimizations for signed / pointers
 571 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 572
 573 # revert to pre-gcc-4.4 behaviour of .eh_frame
 574 KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 575
 576 # conserve stack if available
 577 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 578
 579 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 580 # But warn user when we do so
 581 warn-assign = \
 582 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 583
 584 ifneq ($(KCPPFLAGS),)
 585         $(call warn-assign,CPPFLAGS)
 586         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 587 endif
 588 ifneq ($(KAFLAGS),)
 589         $(call warn-assign,AFLAGS)
 590         KBUILD_AFLAGS += $(KAFLAGS)
 591 endif
 592 ifneq ($(KCFLAGS),)
 593         $(call warn-assign,CFLAGS)
 594         KBUILD_CFLAGS += $(KCFLAGS)
 595 endif
 596
 597 # Use --build-id when available.
 598 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 599                               $(call cc-ldoption, -Wl$(comma)--build-id,))
 600 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 601 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 602
 603 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 604 LDFLAGS_vmlinux += $(call ld-option, -X,)
 605 endif
 606
 607 # Default kernel image to build when no specific target is given.
 608 # KBUILD_IMAGE may be overruled on the command line or
 609 # set in the environment
 610 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 611 # this default value
 612 export KBUILD_IMAGE ?= vmlinux
 613
 614 #
 615 # INSTALL_PATH specifies where to place the updated kernel and system map
 616 # images. Default is /boot, but you can set it to other values
 617 export  INSTALL_PATH ?= /boot
 618
 619 #
 620 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 621 # relocations required by build roots.  This is not defined in the
 622 # makefile but the argument can be passed to make if needed.
 623 #
 624
 625 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 626 export MODLIB
 627
 628 #
 629 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 630 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 631 #  the default option --strip-debug will be used.  Otherwise,
 632 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 633
 634 ifdef INSTALL_MOD_STRIP
 635 ifeq ($(INSTALL_MOD_STRIP),1)
 636 mod_strip_cmd = $(STRIP) --strip-debug
 637 else
 638 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 639 endif # INSTALL_MOD_STRIP=1
 640 else
 641 mod_strip_cmd = true
 642 endif # INSTALL_MOD_STRIP
 643 export mod_strip_cmd
 644
 645
 646 ifeq ($(KBUILD_EXTMOD),)
 647 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 648
 649 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 650                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 651                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 652
 653 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 654                      $(init-n) $(init-) \
 655                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 656                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 657
 658 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 659 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 660 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 661 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 662 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 663 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 664 libs-y          := $(libs-y1) $(libs-y2)
 665
 666 # Build vmlinux
 667 # ---------------------------------------------------------------------------
 668 # vmlinux is built from the objects selected by $(vmlinux-init) and
 669 # $(vmlinux-main). Most are built-in.o files from top-level directories
 670 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 671 # Ordering when linking is important, and $(vmlinux-init) must be first.
 672 #
 673 # vmlinux
 674 #   ^
 675 #   |
 676 #   +-< $(vmlinux-init)
 677 #   |   +--< init/version.o + more
 678 #   |
 679 #   +--< $(vmlinux-main)
 680 #   |    +--< driver/built-in.o mm/built-in.o + more
 681 #   |
 682 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 683 #
 684 # vmlinux version (uname -v) cannot be updated during normal
 685 # descending-into-subdirs phase since we do not yet know if we need to
 686 # update vmlinux.
 687 # Therefore this step is delayed until just before final link of vmlinux -
 688 # except in the kallsyms case where it is done just before adding the
 689 # symbols to the kernel.
 690 #
 691 # System.map is generated to document addresses of all kernel symbols
 692
 693 vmlinux-init := $(head-y) $(init-y)
 694 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 695 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 696 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 697 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 698
 699 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 700 # May be overridden by arch/$(ARCH)/Makefile
 701 quiet_cmd_vmlinux__ ?= LD      $@
 702       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 703       -T $(vmlinux-lds) $(vmlinux-init)                          \
 704       --start-group $(vmlinux-main) --end-group                  \
 705       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 706
 707 # Generate new vmlinux version
 708 quiet_cmd_vmlinux_version = GEN     .version
 709       cmd_vmlinux_version = set -e;                     \
 710         if [ ! -r .version ]; then                      \
 711           rm -f .version;                               \
 712           echo 1 >.version;                             \
 713         else                                            \
 714           mv .version .old_version;                     \
 715           expr 0$$(cat .old_version) + 1 >.version;     \
 716         fi;                                             \
 717         $(MAKE) $(build)=init
 718
 719 # Generate System.map
 720 quiet_cmd_sysmap = SYSMAP
 721       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 722
 723 # Link of vmlinux
 724 # If CONFIG_KALLSYMS is set .version is already updated
 725 # Generate System.map and verify that the content is consistent
 726 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 727 # First command is ':' to allow us to use + in front of the rule
 728 define rule_vmlinux__
 729         :
 730         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 731
 732         $(call cmd,vmlinux__)
 733         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 734
 735         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 736           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 737         $(cmd_sysmap) $@ System.map;                                         \
 738         if [ $$? -ne 0 ]; then                                               \
 739                 rm -f $@;                                                    \
 740                 /bin/false;                                                  \
 741         fi;
 742         $(verify_kallsyms)
 743 endef
 744
 745
 746 ifdef CONFIG_KALLSYMS
 747 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 748 # It's a three stage process:
 749 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 750 #   empty
 751 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 752 #   the right size - vmlinux version (uname -v) is updated during this step
 753 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 754 #   but due to the added section, some addresses have shifted.
 755 #   From here, we generate a correct .tmp_kallsyms2.o
 756 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 757 # o Verify that the System.map from vmlinux matches the map from
 758 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 759 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 760 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 761 #   temporary bypass to allow the kernel to be built while the
 762 #   maintainers work out what went wrong with kallsyms.
 763
 764 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 765 last_kallsyms := 3
 766 else
 767 last_kallsyms := 2
 768 endif
 769
 770 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 771
 772 define verify_kallsyms
 773         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 774           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 775           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 776         $(Q)cmp -s System.map .tmp_System.map ||                             \
 777                 (echo Inconsistent kallsyms data;                            \
 778                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 779                  rm .tmp_kallsyms* ; /bin/false )
 780 endef
 781
 782 # Update vmlinux version before link
 783 # Use + in front of this rule to silent warning about make -j1
 784 # First command is ':' to allow us to use + in front of this rule
 785 cmd_ksym_ld = $(cmd_vmlinux__)
 786 define rule_ksym_ld
 787         :
 788         +$(call cmd,vmlinux_version)
 789         $(call cmd,vmlinux__)
 790         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 791 endef
 792
 793 # Generate .S file with all kernel symbols
 794 quiet_cmd_kallsyms = KSYM    $@
 795       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 796                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 797
 798 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 799         $(call if_changed_dep,as_o_S)
 800
 801 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 802         $(call cmd,kallsyms)
 803
 804 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 805 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 806         $(call if_changed_rule,ksym_ld)
 807
 808 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 809         $(call if_changed,vmlinux__)
 810
 811 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 812         $(call if_changed,vmlinux__)
 813
 814 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 815 $(KALLSYMS): scripts ;
 816
 817 # Generate some data for debugging strange kallsyms problems
 818 debug_kallsyms: .tmp_map$(last_kallsyms)
 819
 820 .tmp_map%: .tmp_vmlinux% FORCE
 821         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 822
 823 .tmp_map3: .tmp_map2
 824
 825 .tmp_map2: .tmp_map1
 826
 827 endif # ifdef CONFIG_KALLSYMS
 828
 829 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 830 # relevant sections renamed as per the linker script.
 831 quiet_cmd_vmlinux-modpost = LD      $@
 832       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 833          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 834          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 835 define rule_vmlinux-modpost
 836         :
 837         +$(call cmd,vmlinux-modpost)
 838         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 839         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 840 endef
 841
 842 # vmlinux image - including updated kernel symbols
 843 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 844 ifdef CONFIG_HEADERS_CHECK
 845         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 846 endif
 847 ifdef CONFIG_SAMPLES
 848         $(Q)$(MAKE) $(build)=samples
 849 endif
 850 ifdef CONFIG_BUILD_DOCSRC
 851         $(Q)$(MAKE) $(build)=Documentation
 852 endif
 853         $(call vmlinux-modpost)
 854         $(call if_changed_rule,vmlinux__)
 855         $(Q)rm -f .old_version
 856
 857 # build vmlinux.o first to catch section mismatch errors early
 858 ifdef CONFIG_KALLSYMS
 859 .tmp_vmlinux1: vmlinux.o
 860 endif
 861
 862 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 863 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 864         $(call if_changed_rule,vmlinux-modpost)
 865
 866 # The actual objects are generated when descending,
 867 # make sure no implicit rule kicks in
 868 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 869
 870 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 871 # Preset locale variables to speed up the build process. Limit locale
 872 # tweaks to this spot to avoid wrong language settings when running
 873 # make menuconfig etc.
 874 # Error messages still appears in the original language
 875
 876 PHONY += $(vmlinux-dirs)
 877 $(vmlinux-dirs): prepare scripts
 878         $(Q)$(MAKE) $(build)=$@
 879 ifdef CONFIG_MODULES
 880         $(Q)$(MAKE) $(modbuiltin)=$@
 881 endif
 882
 883 # Build the kernel release string
 884 #
 885 # The KERNELRELEASE value built here is stored in the file
 886 # include/config/kernel.release, and is used when executing several
 887 # make targets, such as "make install" or "make modules_install."
 888 #
 889 # The eventual kernel release string consists of the following fields,
 890 # shown in a hierarchical format to show how smaller parts are concatenated
 891 # to form the larger and final value, with values coming from places like
 892 # the Makefile, kernel config options, make command line options and/or
 893 # SCM tag information.
 894 #
 895 #       $(KERNELVERSION)
 896 #         $(VERSION)                    eg, 2
 897 #         $(PATCHLEVEL)                 eg, 6
 898 #         $(SUBLEVEL)                   eg, 18
 899 #         $(EXTRAVERSION)               eg, -rc6
 900 #       $(localver-full)
 901 #         $(localver)
 902 #           localversion*               (files without backups, containing '~')
 903 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 904 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 905 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 906 #           $(LOCALVERSION)             (from make command line if provided)
 907 #
 908 #  Note how the final $(localver-auto) string is included *only* if the
 909 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 910 # moment, only git is supported but other SCMs can edit the script
 911 # scripts/setlocalversion and add the appropriate checks as needed.
 912
 913 pattern = ".*/localversion[^~]*"
 914 string  = $(shell cat /dev/null \
 915            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 916
 917 localver = $(subst $(space),, $(string) \
 918                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 919
 920 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 921 # and if the SCM is know a tag from the SCM is appended.
 922 # The appended tag is determined by the SCM used.
 923 #
 924 # .scmversion is used when generating rpm packages so we do not loose
 925 # the version information from the SCM when we do the build of the kernel
 926 # from the copied source
 927 ifdef CONFIG_LOCALVERSION_AUTO
 928
 929 ifeq ($(wildcard .scmversion),)
 930         _localver-auto = $(shell $(CONFIG_SHELL) \
 931                          $(srctree)/scripts/setlocalversion $(srctree))
 932 else
 933         _localver-auto = $(shell cat .scmversion 2> /dev/null)
 934 endif
 935
 936         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 937 endif
 938
 939 localver-full = $(localver)$(localver-auto)
 940
 941 # Store (new) KERNELRELASE string in include/config/kernel.release
 942 kernelrelease = $(KERNELVERSION)$(localver-full)
 943 include/config/kernel.release: include/config/auto.conf FORCE
 944         $(Q)rm -f $@
 945         $(Q)echo $(kernelrelease) > $@
 946
 947
 948 # Things we need to do before we recursively start building the kernel
 949 # or the modules are listed in "prepare".
 950 # A multi level approach is used. prepareN is processed before prepareN-1.
 951 # archprepare is used in arch Makefiles and when processed asm symlink,
 952 # version.h and scripts_basic is processed / created.
 953
 954 # Listed in dependency order
 955 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 956
 957 # prepare3 is used to check if we are building in a separate output directory,
 958 # and if so do:
 959 # 1) Check that make has not been executed in the kernel src $(srctree)
 960 prepare3: include/config/kernel.release
 961 ifneq ($(KBUILD_SRC),)
 962         @$(kecho) '  Using $(srctree) as source for kernel'
 963         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 964                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 965                 echo "  in the '$(srctree)' directory.";\
 966                 /bin/false; \
 967         fi;
 968 endif
 969
 970 # prepare2 creates a makefile if using a separate output directory
 971 prepare2: prepare3 outputmakefile
 972
 973 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 974                    include/config/auto.conf
 975         $(cmd_crmodverdir)
 976
 977 archprepare: prepare1 scripts_basic
 978
 979 prepare0: archprepare FORCE
 980         $(Q)$(MAKE) $(build)=.
 981         $(Q)$(MAKE) $(build)=. missing-syscalls
 982
 983 # All the preparing..
 984 prepare: prepare0
 985
 986 # Generate some files
 987 # ---------------------------------------------------------------------------
 988
 989 # KERNELRELEASE can change from a few different places, meaning version.h
 990 # needs to be updated, so this check is forced on all builds
 991
 992 uts_len := 64
 993 define filechk_utsrelease.h
 994         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 995           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 996           exit 1;                                                         \
 997         fi;                                                               \
 998         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 999 endef
1000
1001 define filechk_version.h
1002         (echo \#define LINUX_VERSION_CODE $(shell                             \
1003         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1004         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1005 endef
1006
1007 include/linux/version.h: $(srctree)/Makefile FORCE
1008         $(call filechk,version.h)
1009
1010 include/generated/utsrelease.h: include/config/kernel.release FORCE
1011         $(call filechk,utsrelease.h)
1012
1013 PHONY += headerdep
1014 headerdep:
1015         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1016
1017 # ---------------------------------------------------------------------------
1018
1019 PHONY += depend dep
1020 depend dep:
1021         @echo '*** Warning: make $@ is unnecessary now.'
1022
1023 # ---------------------------------------------------------------------------
1024 # Firmware install
1025 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1026 export INSTALL_FW_PATH
1027
1028 PHONY += firmware_install
1029 firmware_install: FORCE
1030         @mkdir -p $(objtree)/firmware
1031         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1032
1033 # ---------------------------------------------------------------------------
1034 # Kernel headers
1035
1036 #Default location for installed headers
1037 export INSTALL_HDR_PATH = $(objtree)/usr
1038
1039 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1040
1041 # If we do an all arch process set dst to asm-$(hdr-arch)
1042 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1043
1044 PHONY += __headers
1045 __headers: include/linux/version.h scripts_basic FORCE
1046         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1047
1048 PHONY += headers_install_all
1049 headers_install_all:
1050         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1051
1052 PHONY += headers_install
1053 headers_install: __headers
1054         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1055         $(error Headers not exportable for the $(SRCARCH) architecture))
1056         $(Q)$(MAKE) $(hdr-inst)=include
1057         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1058
1059 PHONY += headers_check_all
1060 headers_check_all: headers_install_all
1061         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1062
1063 PHONY += headers_check
1064 headers_check: headers_install
1065         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1066         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1067
1068 # ---------------------------------------------------------------------------
1069 # Modules
1070
1071 ifdef CONFIG_MODULES
1072
1073 # By default, build modules as well
1074
1075 all: modules
1076
1077 #       Build modules
1078 #
1079 #       A module can be listed more than once in obj-m resulting in
1080 #       duplicate lines in modules.order files.  Those are removed
1081 #       using awk while concatenating to the final file.
1082
1083 PHONY += modules
1084 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1085         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1086         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
1087         @$(kecho) '  Building modules, stage 2.';
1088         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1089         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1090
1091
1092 # Target to prepare building external modules
1093 PHONY += modules_prepare
1094 modules_prepare: prepare scripts
1095
1096 # Target to install modules
1097 PHONY += modules_install
1098 modules_install: _modinst_ _modinst_post
1099
1100 PHONY += _modinst_
1101 _modinst_:
1102         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1103                 echo "Warning: you may need to install module-init-tools"; \
1104                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1105                 sleep 1; \
1106         fi
1107         @rm -rf $(MODLIB)/kernel
1108         @rm -f $(MODLIB)/source
1109         @mkdir -p $(MODLIB)/kernel
1110         @ln -s $(srctree) $(MODLIB)/source
1111         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1112                 rm -f $(MODLIB)/build ; \
1113                 ln -s $(objtree) $(MODLIB)/build ; \
1114         fi
1115         @cp -f $(objtree)/modules.order $(MODLIB)/
1116         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1117         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1118
1119 # This depmod is only for convenience to give the initial
1120 # boot a modules.dep even before / is mounted read-write.  However the
1121 # boot script depmod is the master version.
1122 PHONY += _modinst_post
1123 _modinst_post: _modinst_
1124         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1125         $(call cmd,depmod)
1126
1127 else # CONFIG_MODULES
1128
1129 # Modules not configured
1130 # ---------------------------------------------------------------------------
1131
1132 modules modules_install: FORCE
1133         @echo
1134         @echo "The present kernel configuration has modules disabled."
1135         @echo "Type 'make config' and enable loadable module support."
1136         @echo "Then build a kernel with module support enabled."
1137         @echo
1138         @exit 1
1139
1140 endif # CONFIG_MODULES
1141
1142 ###
1143 # Cleaning is done on three levels.
1144 # make clean     Delete most generated files
1145 #                Leave enough to build external modules
1146 # make mrproper  Delete the current configuration, and all generated files
1147 # make distclean Remove editor backup files, patch leftover files and the like
1148
1149 # Directories & files removed with 'make clean'
1150 CLEAN_DIRS  += $(MODVERDIR)
1151 CLEAN_FILES +=  vmlinux System.map \
1152                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1153
1154 # Directories & files removed with 'make mrproper'
1155 MRPROPER_DIRS  += include/config usr/include include/generated
1156 MRPROPER_FILES += .config .config.old .version .old_version             \
1157                   include/linux/version.h                               \
1158                   Module.symvers tags TAGS cscope*
1159
1160 # clean - Delete most, but leave enough to build external modules
1161 #
1162 clean: rm-dirs  := $(CLEAN_DIRS)
1163 clean: rm-files := $(CLEAN_FILES)
1164 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1165
1166 PHONY += $(clean-dirs) clean archclean
1167 $(clean-dirs):
1168         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1169
1170 clean: archclean $(clean-dirs)
1171         $(call cmd,rmdirs)
1172         $(call cmd,rmfiles)
1173         @find . $(RCS_FIND_IGNORE) \
1174                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1175                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1176                 -o -name '*.symtypes' -o -name 'modules.order' \
1177                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1178                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1179
1180 # mrproper - Delete all generated files, including .config
1181 #
1182 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1183 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1184 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1185
1186 PHONY += $(mrproper-dirs) mrproper archmrproper
1187 $(mrproper-dirs):
1188         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1189
1190 mrproper: clean archmrproper $(mrproper-dirs)
1191         $(call cmd,rmdirs)
1192         $(call cmd,rmfiles)
1193
1194 # distclean
1195 #
1196 PHONY += distclean
1197
1198 distclean: mrproper
1199         @find $(srctree) $(RCS_FIND_IGNORE) \
1200                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1201                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1202                 -o -name '.*.rej' -o -size 0 \
1203                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1204                 -type f -print | xargs rm -f
1205
1206
1207 # Packaging of the kernel to various formats
1208 # ---------------------------------------------------------------------------
1209 # rpm target kept for backward compatibility
1210 package-dir     := $(srctree)/scripts/package
1211
1212 %pkg: include/config/kernel.release FORCE
1213         $(Q)$(MAKE) $(build)=$(package-dir) $@
1214 rpm: include/config/kernel.release FORCE
1215         $(Q)$(MAKE) $(build)=$(package-dir) $@
1216
1217
1218 # Brief documentation of the typical targets used
1219 # ---------------------------------------------------------------------------
1220
1221 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1222 boards := $(notdir $(boards))
1223 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1224 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1225
1226 help:
1227         @echo  'Cleaning targets:'
1228         @echo  '  clean           - Remove most generated files but keep the config and'
1229         @echo  '                    enough build support to build external modules'
1230         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1231         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1232         @echo  ''
1233         @echo  'Configuration targets:'
1234         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1235         @echo  ''
1236         @echo  'Other generic targets:'
1237         @echo  '  all             - Build all targets marked with [*]'
1238         @echo  '* vmlinux         - Build the bare kernel'
1239         @echo  '* modules         - Build all modules'
1240         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1241         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1242         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1243         @echo  '  dir/            - Build all files in dir and below'
1244         @echo  '  dir/file.[ois]  - Build specified target only'
1245         @echo  '  dir/file.ko     - Build module including final link'
1246         @echo  '  modules_prepare - Set up for building external modules'
1247         @echo  '  tags/TAGS       - Generate tags file for editors'
1248         @echo  '  cscope          - Generate cscope index'
1249         @echo  '  kernelrelease   - Output the release version string'
1250         @echo  '  kernelversion   - Output the version stored in Makefile'
1251         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1252          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1253          echo  ''
1254         @echo  'Static analysers'
1255         @echo  '  checkstack      - Generate a list of stack hogs'
1256         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1257         @echo  '  versioncheck    - Sanity check on version.h usage'
1258         @echo  '  includecheck    - Check for duplicate included header files'
1259         @echo  '  export_report   - List the usages of all exported symbols'
1260         @echo  '  headers_check   - Sanity check on exported headers'
1261         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1262          echo  ''
1263         @echo  'Kernel packaging:'
1264         @$(MAKE) $(build)=$(package-dir) help
1265         @echo  ''
1266         @echo  'Documentation targets:'
1267         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1268         @echo  ''
1269         @echo  'Architecture specific targets ($(SRCARCH)):'
1270         @$(if $(archhelp),$(archhelp),\
1271                 echo '  No architecture specific help defined for $(SRCARCH)')
1272         @echo  ''
1273         @$(if $(boards), \
1274                 $(foreach b, $(boards), \
1275                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1276                 echo '')
1277         @$(if $(board-dirs), \
1278                 $(foreach b, $(board-dirs), \
1279                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1280                 printf "  %-16s - Show all of the above\\n" help-boards; \
1281                 echo '')
1282
1283         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1284         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1285         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1286         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1287         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1288         @echo  ''
1289         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1290         @echo  'For further info see the ./README file'
1291
1292
1293 help-board-dirs := $(addprefix help-,$(board-dirs))
1294
1295 help-boards: $(help-board-dirs)
1296
1297 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1298
1299 $(help-board-dirs): help-%:
1300         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1301         @$(if $(boards-per-dir), \
1302                 $(foreach b, $(boards-per-dir), \
1303                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1304                 echo '')
1305
1306
1307 # Documentation targets
1308 # ---------------------------------------------------------------------------
1309 %docs: scripts_basic FORCE
1310         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1311
1312 else # KBUILD_EXTMOD
1313
1314 ###
1315 # External module support.
1316 # When building external modules the kernel used as basis is considered
1317 # read-only, and no consistency checks are made and the make
1318 # system is not used on the basis kernel. If updates are required
1319 # in the basis kernel ordinary make commands (without M=...) must
1320 # be used.
1321 #
1322 # The following are the only valid targets when building external
1323 # modules.
1324 # make M=dir clean     Delete all automatically generated files
1325 # make M=dir modules   Make all modules in specified dir
1326 # make M=dir           Same as 'make M=dir modules'
1327 # make M=dir modules_install
1328 #                      Install the modules built in the module directory
1329 #                      Assumes install directory is already created
1330
1331 # We are always building modules
1332 KBUILD_MODULES := 1
1333 PHONY += crmodverdir
1334 crmodverdir:
1335         $(cmd_crmodverdir)
1336
1337 PHONY += $(objtree)/Module.symvers
1338 $(objtree)/Module.symvers:
1339         @test -e $(objtree)/Module.symvers || ( \
1340         echo; \
1341         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1342         echo "           is missing; modules will have no dependencies and modversions."; \
1343         echo )
1344
1345 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1346 PHONY += $(module-dirs) modules
1347 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1348         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1349
1350 modules: $(module-dirs)
1351         @$(kecho) '  Building modules, stage 2.';
1352         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1353
1354 PHONY += modules_install
1355 modules_install: _emodinst_ _emodinst_post
1356
1357 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1358 PHONY += _emodinst_
1359 _emodinst_:
1360         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1361         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1362
1363 PHONY += _emodinst_post
1364 _emodinst_post: _emodinst_
1365         $(call cmd,depmod)
1366
1367 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1368
1369 PHONY += $(clean-dirs) clean
1370 $(clean-dirs):
1371         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1372
1373 clean:  rm-dirs := $(MODVERDIR)
1374 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1375                    $(KBUILD_EXTMOD)/modules.order \
1376                    $(KBUILD_EXTMOD)/modules.builtin
1377 clean: $(clean-dirs)
1378         $(call cmd,rmdirs)
1379         $(call cmd,rmfiles)
1380         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1381                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1382                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1383                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1384
1385 help:
1386         @echo  '  Building external modules.'
1387         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1388         @echo  ''
1389         @echo  '  modules         - default target, build the module(s)'
1390         @echo  '  modules_install - install the module'
1391         @echo  '  clean           - remove generated files in module directory only'
1392         @echo  ''
1393
1394 # Dummies...
1395 PHONY += prepare scripts
1396 prepare: ;
1397 scripts: ;
1398 endif # KBUILD_EXTMOD
1399
1400 # Generate tags for editors
1401 # ---------------------------------------------------------------------------
1402 quiet_cmd_tags = GEN     $@
1403       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1404
1405 tags TAGS cscope: FORCE
1406         $(call cmd,tags)
1407
1408 # Scripts to check various things for consistency
1409 # ---------------------------------------------------------------------------
1410
1411 includecheck:
1412         find * $(RCS_FIND_IGNORE) \
1413                 -name '*.[hcS]' -type f -print | sort \
1414                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1415
1416 versioncheck:
1417         find * $(RCS_FIND_IGNORE) \
1418                 -name '*.[hcS]' -type f -print | sort \
1419                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1420
1421 namespacecheck:
1422         $(PERL) $(srctree)/scripts/namespace.pl
1423
1424 export_report:
1425         $(PERL) $(srctree)/scripts/export_report.pl
1426
1427 endif #ifeq ($(config-targets),1)
1428 endif #ifeq ($(mixed-targets),1)
1429
1430 PHONY += checkstack kernelrelease kernelversion
1431
1432 # UML needs a little special treatment here.  It wants to use the host
1433 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1434 # else wants $(ARCH), including people doing cross-builds, which means
1435 # that $(SUBARCH) doesn't work here.
1436 ifeq ($(ARCH), um)
1437 CHECKSTACK_ARCH := $(SUBARCH)
1438 else
1439 CHECKSTACK_ARCH := $(ARCH)
1440 endif
1441 checkstack:
1442         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1443         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1444
1445 kernelrelease:
1446         $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1447         $(error kernelrelease not valid - run 'make prepare' to update it))
1448 kernelversion:
1449         @echo $(KERNELVERSION)
1450
1451 # Single targets
1452 # ---------------------------------------------------------------------------
1453 # Single targets are compatible with:
1454 # - build with mixed source and output
1455 # - build with separate output dir 'make O=...'
1456 # - external modules
1457 #
1458 #  target-dir => where to store outputfile
1459 #  build-dir  => directory in kernel source tree to use
1460
1461 ifeq ($(KBUILD_EXTMOD),)
1462         build-dir  = $(patsubst %/,%,$(dir $@))
1463         target-dir = $(dir $@)
1464 else
1465         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1466         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1467         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1468 endif
1469
1470 %.s: %.c prepare scripts FORCE
1471         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1472 %.i: %.c prepare scripts FORCE
1473         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1474 %.o: %.c prepare scripts FORCE
1475         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1476 %.lst: %.c prepare scripts FORCE
1477         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1478 %.s: %.S prepare scripts FORCE
1479         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480 %.o: %.S prepare scripts FORCE
1481         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1482 %.symtypes: %.c prepare scripts FORCE
1483         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1484
1485 # Modules
1486 /: prepare scripts FORCE
1487         $(cmd_crmodverdir)
1488         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1489         $(build)=$(build-dir)
1490 %/: prepare scripts FORCE
1491         $(cmd_crmodverdir)
1492         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1493         $(build)=$(build-dir)
1494 %.ko: prepare scripts FORCE
1495         $(cmd_crmodverdir)
1496         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1497         $(build)=$(build-dir) $(@:.ko=.o)
1498         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1499
1500 # FIXME Should go into a make.lib or something
1501 # ===========================================================================
1502
1503 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1504       cmd_rmdirs = rm -rf $(rm-dirs)
1505
1506 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1507       cmd_rmfiles = rm -f $(rm-files)
1508
1509 # Run depmod only if we have System.map and depmod is executable
1510 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1511       cmd_depmod = \
1512         if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1513                 $(DEPMOD) -ae -F System.map                                     \
1514                 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1515                 $(KERNELRELEASE);                                               \
1516         fi
1517
1518 # Create temporary dir for module support files
1519 # clean it up only when building all modules
1520 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1521                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1522
1523 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1524           $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1525           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1526
1527 quiet_cmd_as_o_S = AS      $@
1528 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1529
1530 # read all saved command lines
1531
1532 targets := $(wildcard $(sort $(targets)))
1533 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1534
1535 ifneq ($(cmd_files),)
1536   $(cmd_files): ;       # Do not try to update included dependency files
1537   include $(cmd_files)
1538 endif
1539
1540 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1541 # Usage:
1542 # $(Q)$(MAKE) $(clean)=dir
1543 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1544
1545 endif   # skip-makefile
1546
1547 PHONY += FORCE
1548 FORCE:
1549
1550 # Declare the contents of the .PHONY variable as phony.  We keep that
1551 # information in a variable so we can use it in if_changed and friends.
1552 .PHONY: $(PHONY)