Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 28
   4 EXTRAVERSION = -rc7
   5 NAME = Erotic Pickled Herring
   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 ifdef V
  39   ifeq ("$(origin V)", "command line")
  40     KBUILD_VERBOSE = $(V)
  41   endif
  42 endif
  43 ifndef KBUILD_VERBOSE
  44   KBUILD_VERBOSE = 0
  45 endif
  46
  47 # Call a source code checker (by default, "sparse") as part of the
  48 # C compilation.
  49 #
  50 # Use 'make C=1' to enable checking of only re-compiled files.
  51 # Use 'make C=2' to enable checking of *all* source files, regardless
  52 # of whether they are re-compiled or not.
  53 #
  54 # See the file "Documentation/sparse.txt" for more details, including
  55 # where to get the "sparse" utility.
  56
  57 ifdef C
  58   ifeq ("$(origin C)", "command line")
  59     KBUILD_CHECKSRC = $(C)
  60   endif
  61 endif
  62 ifndef KBUILD_CHECKSRC
  63   KBUILD_CHECKSRC = 0
  64 endif
  65
  66 # Use make M=dir to specify directory of external module to build
  67 # Old syntax make ... SUBDIRS=$PWD is still supported
  68 # Setting the environment variable KBUILD_EXTMOD take precedence
  69 ifdef SUBDIRS
  70   KBUILD_EXTMOD ?= $(SUBDIRS)
  71 endif
  72 ifdef M
  73   ifeq ("$(origin M)", "command line")
  74     KBUILD_EXTMOD := $(M)
  75   endif
  76 endif
  77
  78
  79 # kbuild supports saving output files in a separate directory.
  80 # To locate output files in a separate directory two syntaxes are supported.
  81 # In both cases the working directory must be the root of the kernel src.
  82 # 1) O=
  83 # Use "make O=dir/to/store/output/files/"
  84 #
  85 # 2) Set KBUILD_OUTPUT
  86 # Set the environment variable KBUILD_OUTPUT to point to the directory
  87 # where the output files shall be placed.
  88 # export KBUILD_OUTPUT=dir/to/store/output/files/
  89 # make
  90 #
  91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92 # variable.
  93
  94
  95 # KBUILD_SRC is set on invocation of make in OBJ directory
  96 # KBUILD_SRC is not intended to be used by the regular user (for now)
  97 ifeq ($(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 ifdef O
 102   ifeq ("$(origin O)", "command line")
 103     KBUILD_OUTPUT := $(O)
 104   endif
 105 endif
 106
 107 # That's our default target when none is given on the command line
 108 PHONY := _all
 109 _all:
 110
 111 # Cancel implicit rules on top Makefile
 112 $(CURDIR)/Makefile Makefile: ;
 113
 114 ifneq ($(KBUILD_OUTPUT),)
 115 # Invoke a second make in the output directory, passing relevant variables
 116 # check that the output directory actually exists
 117 saved-output := $(KBUILD_OUTPUT)
 118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119 $(if $(KBUILD_OUTPUT),, \
 120      $(error output directory "$(saved-output)" does not exist))
 121
 122 PHONY += $(MAKECMDGOALS) sub-make
 123
 124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125         $(Q)@:
 126
 127 sub-make: FORCE
 128         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129         KBUILD_SRC=$(CURDIR) \
 130         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131         $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133 # Leave processing to above invocation of make
 134 skip-makefile := 1
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136 endif # ifeq ($(KBUILD_SRC),)
 137
 138 # We process the rest of the Makefile if this is the final invocation of make
 139 ifeq ($(skip-makefile),)
 140
 141 # If building an external module we do not care about the all: rule
 142 # but instead _all depend on modules
 143 PHONY += all
 144 ifeq ($(KBUILD_EXTMOD),)
 145 _all: all
 146 else
 147 _all: modules
 148 endif
 149
 150 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151 TOPDIR          := $(srctree)
 152 # FIXME - TOPDIR is obsolete, use srctree/objtree
 153 objtree         := $(CURDIR)
 154 src             := $(srctree)
 155 obj             := $(objtree)
 156
 157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159 export srctree objtree VPATH TOPDIR
 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.*/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 ($(ARCH),x86_64)
 205         SRCARCH := x86
 206 endif
 207
 208 # Where to locate arch specific headers
 209 ifeq ($(ARCH),sparc64)
 210        hdr-arch  := sparc
 211 else
 212        hdr-arch  := $(SRCARCH)
 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 -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 DEPMOD          = /sbin/depmod
 319 KALLSYMS        = scripts/kallsyms
 320 PERL            = perl
 321 CHECK           = sparse
 322
 323 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 324 MODFLAGS        = -DMODULE
 325 CFLAGS_MODULE   = $(MODFLAGS)
 326 AFLAGS_MODULE   = $(MODFLAGS)
 327 LDFLAGS_MODULE  =
 328 CFLAGS_KERNEL   =
 329 AFLAGS_KERNEL   =
 330
 331
 332 # Use LINUXINCLUDE when you must reference the include/ directory.
 333 # Needed to be compatible with the O= option
 334 LINUXINCLUDE    := -Iinclude \
 335                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 336                    -I$(srctree)/arch/$(hdr-arch)/include               \
 337                    -include include/linux/autoconf.h
 338
 339 KBUILD_CPPFLAGS := -D__KERNEL__
 340
 341 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 342                    -fno-strict-aliasing -fno-common \
 343                    -Werror-implicit-function-declaration
 344 KBUILD_AFLAGS   := -D__ASSEMBLY__
 345
 346 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 347 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 348 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 349
 350 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 351 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 352 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 353 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 354
 355 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 356 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 357 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 358
 359 # When compiling out-of-tree modules, put MODVERDIR in the module
 360 # tree rather than in the kernel tree. The kernel tree might
 361 # even be read-only.
 362 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 363
 364 # Files to ignore in find ... statements
 365
 366 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
 367 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 368
 369 # ===========================================================================
 370 # Rules shared between *config targets and build targets
 371
 372 # Basic helpers built in scripts/
 373 PHONY += scripts_basic
 374 scripts_basic:
 375         $(Q)$(MAKE) $(build)=scripts/basic
 376
 377 # To avoid any implicit rule to kick in, define an empty command.
 378 scripts/basic/%: scripts_basic ;
 379
 380 PHONY += outputmakefile
 381 # outputmakefile generates a Makefile in the output directory, if using a
 382 # separate output directory. This allows convenient use of make in the
 383 # output directory.
 384 outputmakefile:
 385 ifneq ($(KBUILD_SRC),)
 386         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 387             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 388 endif
 389
 390 # To make sure we do not include .config for any of the *config targets
 391 # catch them early, and hand them over to scripts/kconfig/Makefile
 392 # It is allowed to specify more targets when calling make, including
 393 # mixing *config targets and build targets.
 394 # For example 'make oldconfig all'.
 395 # Detect when mixed targets is specified, and make a second invocation
 396 # of make so .config is not included in this case either (for *config).
 397
 398 no-dot-config-targets := clean mrproper distclean \
 399                          cscope TAGS tags help %docs check% \
 400                          include/linux/version.h headers_% \
 401                          kernelrelease kernelversion
 402
 403 config-targets := 0
 404 mixed-targets  := 0
 405 dot-config     := 1
 406
 407 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 408         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 409                 dot-config := 0
 410         endif
 411 endif
 412
 413 ifeq ($(KBUILD_EXTMOD),)
 414         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 415                 config-targets := 1
 416                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 417                         mixed-targets := 1
 418                 endif
 419         endif
 420 endif
 421
 422 ifeq ($(mixed-targets),1)
 423 # ===========================================================================
 424 # We're called with mixed targets (*config and build targets).
 425 # Handle them one by one.
 426
 427 %:: FORCE
 428         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 429
 430 else
 431 ifeq ($(config-targets),1)
 432 # ===========================================================================
 433 # *config targets only - make sure prerequisites are updated, and descend
 434 # in scripts/kconfig to make the *config target
 435
 436 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 437 # KBUILD_DEFCONFIG may point out an alternative default configuration
 438 # used for 'make defconfig'
 439 include $(srctree)/arch/$(SRCARCH)/Makefile
 440 export KBUILD_DEFCONFIG KBUILD_KCONFIG
 441
 442 config: scripts_basic outputmakefile FORCE
 443         $(Q)mkdir -p include/linux include/config
 444         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 445
 446 %config: scripts_basic outputmakefile FORCE
 447         $(Q)mkdir -p include/linux include/config
 448         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 449
 450 else
 451 # ===========================================================================
 452 # Build targets only - this includes vmlinux, arch specific targets, clean
 453 # targets and others. In general all targets except *config targets.
 454
 455 ifeq ($(KBUILD_EXTMOD),)
 456 # Additional helpers built in scripts/
 457 # Carefully list dependencies so we do not try to build scripts twice
 458 # in parallel
 459 PHONY += scripts
 460 scripts: scripts_basic include/config/auto.conf
 461         $(Q)$(MAKE) $(build)=$(@)
 462
 463 # Objects we will link into vmlinux / subdirs we need to visit
 464 init-y          := init/
 465 drivers-y       := drivers/ sound/ firmware/
 466 net-y           := net/
 467 libs-y          := lib/
 468 core-y          := usr/
 469 endif # KBUILD_EXTMOD
 470
 471 ifeq ($(dot-config),1)
 472 # Read in config
 473 -include include/config/auto.conf
 474
 475 ifeq ($(KBUILD_EXTMOD),)
 476 # Read in dependencies to all Kconfig* files, make sure to run
 477 # oldconfig if changes are detected.
 478 -include include/config/auto.conf.cmd
 479
 480 # To avoid any implicit rule to kick in, define an empty command
 481 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 482
 483 # If .config is newer than include/config/auto.conf, someone tinkered
 484 # with it and forgot to run make oldconfig.
 485 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
 486 # we execute the config step to be sure to catch updated Kconfig files
 487 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 488         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 489 else
 490 # external modules needs include/linux/autoconf.h and include/config/auto.conf
 491 # but do not care if they are up-to-date. Use auto.conf to trigger the test
 492 PHONY += include/config/auto.conf
 493
 494 include/config/auto.conf:
 495         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 496         echo;                                                           \
 497         echo "  ERROR: Kernel configuration is invalid.";               \
 498         echo "         include/linux/autoconf.h or $@ are missing.";    \
 499         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 500         echo;                                                           \
 501         /bin/false)
 502
 503 endif # KBUILD_EXTMOD
 504
 505 else
 506 # Dummy target needed, because used as prerequisite
 507 include/config/auto.conf: ;
 508 endif # $(dot-config)
 509
 510 # The all: target is the default when no target is given on the
 511 # command line.
 512 # This allow a user to issue only 'make' to build a kernel including modules
 513 # Defaults vmlinux but it is usually overridden in the arch makefile
 514 all: vmlinux
 515
 516 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 517 KBUILD_CFLAGS   += -Os
 518 else
 519 KBUILD_CFLAGS   += -O2
 520 endif
 521
 522 include $(srctree)/arch/$(SRCARCH)/Makefile
 523
 524 ifneq (CONFIG_FRAME_WARN,0)
 525 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 526 endif
 527
 528 # Force gcc to behave correct even for buggy distributions
 529 # Arch Makefiles may override this setting
 530 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 531
 532 ifdef CONFIG_FRAME_POINTER
 533 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 534 else
 535 KBUILD_CFLAGS   += -fomit-frame-pointer
 536 endif
 537
 538 ifdef CONFIG_DEBUG_INFO
 539 KBUILD_CFLAGS   += -g
 540 KBUILD_AFLAGS   += -gdwarf-2
 541 endif
 542
 543 ifdef CONFIG_FUNCTION_TRACER
 544 KBUILD_CFLAGS   += -pg
 545 endif
 546
 547 # We trigger additional mismatches with less inlining
 548 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 549 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 550 endif
 551
 552 # arch Makefile may override CC so keep this after arch Makefile is included
 553 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 554 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 555
 556 # warn about C99 declaration after statement
 557 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 558
 559 # disable pointer signed / unsigned warnings in gcc 4.0
 560 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 561
 562 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 563 # But warn user when we do so
 564 warn-assign = \
 565 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 566
 567 ifneq ($(KCPPFLAGS),)
 568         $(call warn-assign,CPPFLAGS)
 569         KBUILD_CPPFLAGS += $(KCPPFLAGS)
 570 endif
 571 ifneq ($(KAFLAGS),)
 572         $(call warn-assign,AFLAGS)
 573         KBUILD_AFLAGS += $(KAFLAGS)
 574 endif
 575 ifneq ($(KCFLAGS),)
 576         $(call warn-assign,CFLAGS)
 577         KBUILD_CFLAGS += $(KCFLAGS)
 578 endif
 579
 580 # Use --build-id when available.
 581 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 582                               $(call ld-option, -Wl$(comma)--build-id,))
 583 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 584 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 585
 586 # Default kernel image to build when no specific target is given.
 587 # KBUILD_IMAGE may be overruled on the command line or
 588 # set in the environment
 589 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 590 # this default value
 591 export KBUILD_IMAGE ?= vmlinux
 592
 593 #
 594 # INSTALL_PATH specifies where to place the updated kernel and system map
 595 # images. Default is /boot, but you can set it to other values
 596 export  INSTALL_PATH ?= /boot
 597
 598 #
 599 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 600 # relocations required by build roots.  This is not defined in the
 601 # makefile but the argument can be passed to make if needed.
 602 #
 603
 604 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 605 export MODLIB
 606
 607 #
 608 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
 609 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 610 #  the default option --strip-debug will be used.  Otherwise,
 611 #  INSTALL_MOD_STRIP will used as the options to the strip command.
 612
 613 ifdef INSTALL_MOD_STRIP
 614 ifeq ($(INSTALL_MOD_STRIP),1)
 615 mod_strip_cmd = $(STRIP) --strip-debug
 616 else
 617 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 618 endif # INSTALL_MOD_STRIP=1
 619 else
 620 mod_strip_cmd = true
 621 endif # INSTALL_MOD_STRIP
 622 export mod_strip_cmd
 623
 624
 625 ifeq ($(KBUILD_EXTMOD),)
 626 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 627
 628 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 629                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 630                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 631
 632 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 633                      $(init-n) $(init-) \
 634                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 635                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 636
 637 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 638 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 639 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 640 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 641 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 642 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 643 libs-y          := $(libs-y1) $(libs-y2)
 644
 645 # Build vmlinux
 646 # ---------------------------------------------------------------------------
 647 # vmlinux is built from the objects selected by $(vmlinux-init) and
 648 # $(vmlinux-main). Most are built-in.o files from top-level directories
 649 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 650 # Ordering when linking is important, and $(vmlinux-init) must be first.
 651 #
 652 # vmlinux
 653 #   ^
 654 #   |
 655 #   +-< $(vmlinux-init)
 656 #   |   +--< init/version.o + more
 657 #   |
 658 #   +--< $(vmlinux-main)
 659 #   |    +--< driver/built-in.o mm/built-in.o + more
 660 #   |
 661 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 662 #
 663 # vmlinux version (uname -v) cannot be updated during normal
 664 # descending-into-subdirs phase since we do not yet know if we need to
 665 # update vmlinux.
 666 # Therefore this step is delayed until just before final link of vmlinux -
 667 # except in the kallsyms case where it is done just before adding the
 668 # symbols to the kernel.
 669 #
 670 # System.map is generated to document addresses of all kernel symbols
 671
 672 vmlinux-init := $(head-y) $(init-y)
 673 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 674 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 675 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 676 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 677
 678 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 679 # May be overridden by arch/$(ARCH)/Makefile
 680 quiet_cmd_vmlinux__ ?= LD      $@
 681       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 682       -T $(vmlinux-lds) $(vmlinux-init)                          \
 683       --start-group $(vmlinux-main) --end-group                  \
 684       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 685
 686 # Generate new vmlinux version
 687 quiet_cmd_vmlinux_version = GEN     .version
 688       cmd_vmlinux_version = set -e;                     \
 689         if [ ! -r .version ]; then                      \
 690           rm -f .version;                               \
 691           echo 1 >.version;                             \
 692         else                                            \
 693           mv .version .old_version;                     \
 694           expr 0$$(cat .old_version) + 1 >.version;     \
 695         fi;                                             \
 696         $(MAKE) $(build)=init
 697
 698 # Generate System.map
 699 quiet_cmd_sysmap = SYSMAP
 700       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 701
 702 # Link of vmlinux
 703 # If CONFIG_KALLSYMS is set .version is already updated
 704 # Generate System.map and verify that the content is consistent
 705 # Use + in front of the vmlinux_version rule to silent warning with make -j2
 706 # First command is ':' to allow us to use + in front of the rule
 707 define rule_vmlinux__
 708         :
 709         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 710
 711         $(call cmd,vmlinux__)
 712         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 713
 714         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 715           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 716         $(cmd_sysmap) $@ System.map;                                         \
 717         if [ $$? -ne 0 ]; then                                               \
 718                 rm -f $@;                                                    \
 719                 /bin/false;                                                  \
 720         fi;
 721         $(verify_kallsyms)
 722 endef
 723
 724
 725 ifdef CONFIG_KALLSYMS
 726 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 727 # It's a three stage process:
 728 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 729 #   empty
 730 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 731 #   the right size - vmlinux version (uname -v) is updated during this step
 732 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 733 #   but due to the added section, some addresses have shifted.
 734 #   From here, we generate a correct .tmp_kallsyms2.o
 735 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 736 # o Verify that the System.map from vmlinux matches the map from
 737 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 738 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 739 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 740 #   temporary bypass to allow the kernel to be built while the
 741 #   maintainers work out what went wrong with kallsyms.
 742
 743 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 744 last_kallsyms := 3
 745 else
 746 last_kallsyms := 2
 747 endif
 748
 749 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 750
 751 define verify_kallsyms
 752         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 753           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 754           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 755         $(Q)cmp -s System.map .tmp_System.map ||                             \
 756                 (echo Inconsistent kallsyms data;                            \
 757                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 758                  rm .tmp_kallsyms* ; /bin/false )
 759 endef
 760
 761 # Update vmlinux version before link
 762 # Use + in front of this rule to silent warning about make -j1
 763 # First command is ':' to allow us to use + in front of this rule
 764 cmd_ksym_ld = $(cmd_vmlinux__)
 765 define rule_ksym_ld
 766         :
 767         +$(call cmd,vmlinux_version)
 768         $(call cmd,vmlinux__)
 769         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 770 endef
 771
 772 # Generate .S file with all kernel symbols
 773 quiet_cmd_kallsyms = KSYM    $@
 774       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 775                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 776
 777 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 778         $(call if_changed_dep,as_o_S)
 779
 780 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 781         $(call cmd,kallsyms)
 782
 783 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 784 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 785         $(call if_changed_rule,ksym_ld)
 786
 787 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 788         $(call if_changed,vmlinux__)
 789
 790 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 791         $(call if_changed,vmlinux__)
 792
 793 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 794 $(KALLSYMS): scripts ;
 795
 796 # Generate some data for debugging strange kallsyms problems
 797 debug_kallsyms: .tmp_map$(last_kallsyms)
 798
 799 .tmp_map%: .tmp_vmlinux% FORCE
 800         ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 801
 802 .tmp_map3: .tmp_map2
 803
 804 .tmp_map2: .tmp_map1
 805
 806 endif # ifdef CONFIG_KALLSYMS
 807
 808 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 809 # relevant sections renamed as per the linker script.
 810 quiet_cmd_vmlinux-modpost = LD      $@
 811       cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 812          $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 813          $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 814 define rule_vmlinux-modpost
 815         :
 816         +$(call cmd,vmlinux-modpost)
 817         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 818         $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 819 endef
 820
 821 # vmlinux image - including updated kernel symbols
 822 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 823 ifdef CONFIG_HEADERS_CHECK
 824         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 825 endif
 826 ifdef CONFIG_SAMPLES
 827         $(Q)$(MAKE) $(build)=samples
 828 endif
 829 ifdef CONFIG_BUILD_DOCSRC
 830         $(Q)$(MAKE) $(build)=Documentation
 831 endif
 832         $(call vmlinux-modpost)
 833         $(call if_changed_rule,vmlinux__)
 834         $(Q)rm -f .old_version
 835
 836 # build vmlinux.o first to catch section mismatch errors early
 837 ifdef CONFIG_KALLSYMS
 838 .tmp_vmlinux1: vmlinux.o
 839 endif
 840
 841 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 842 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 843         $(call if_changed_rule,vmlinux-modpost)
 844
 845 # The actual objects are generated when descending,
 846 # make sure no implicit rule kicks in
 847 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 848
 849 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 850 # Preset locale variables to speed up the build process. Limit locale
 851 # tweaks to this spot to avoid wrong language settings when running
 852 # make menuconfig etc.
 853 # Error messages still appears in the original language
 854
 855 PHONY += $(vmlinux-dirs)
 856 $(vmlinux-dirs): prepare scripts
 857         $(Q)$(MAKE) $(build)=$@
 858
 859 # Build the kernel release string
 860 #
 861 # The KERNELRELEASE value built here is stored in the file
 862 # include/config/kernel.release, and is used when executing several
 863 # make targets, such as "make install" or "make modules_install."
 864 #
 865 # The eventual kernel release string consists of the following fields,
 866 # shown in a hierarchical format to show how smaller parts are concatenated
 867 # to form the larger and final value, with values coming from places like
 868 # the Makefile, kernel config options, make command line options and/or
 869 # SCM tag information.
 870 #
 871 #       $(KERNELVERSION)
 872 #         $(VERSION)                    eg, 2
 873 #         $(PATCHLEVEL)                 eg, 6
 874 #         $(SUBLEVEL)                   eg, 18
 875 #         $(EXTRAVERSION)               eg, -rc6
 876 #       $(localver-full)
 877 #         $(localver)
 878 #           localversion*               (files without backups, containing '~')
 879 #           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 880 #         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 881 #           ./scripts/setlocalversion   (SCM tag, if one exists)
 882 #           $(LOCALVERSION)             (from make command line if provided)
 883 #
 884 #  Note how the final $(localver-auto) string is included *only* if the
 885 # kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 886 # moment, only git is supported but other SCMs can edit the script
 887 # scripts/setlocalversion and add the appropriate checks as needed.
 888
 889 pattern = ".*/localversion[^~]*"
 890 string  = $(shell cat /dev/null \
 891            `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 892
 893 localver = $(subst $(space),, $(string) \
 894                               $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 895
 896 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 897 # and if the SCM is know a tag from the SCM is appended.
 898 # The appended tag is determined by the SCM used.
 899 #
 900 # Currently, only git is supported.
 901 # Other SCMs can edit scripts/setlocalversion and add the appropriate
 902 # checks as needed.
 903 ifdef CONFIG_LOCALVERSION_AUTO
 904         _localver-auto = $(shell $(CONFIG_SHELL) \
 905                           $(srctree)/scripts/setlocalversion $(srctree))
 906         localver-auto  = $(LOCALVERSION)$(_localver-auto)
 907 endif
 908
 909 localver-full = $(localver)$(localver-auto)
 910
 911 # Store (new) KERNELRELASE string in include/config/kernel.release
 912 kernelrelease = $(KERNELVERSION)$(localver-full)
 913 include/config/kernel.release: include/config/auto.conf FORCE
 914         $(Q)rm -f $@
 915         $(Q)echo $(kernelrelease) > $@
 916
 917
 918 # Things we need to do before we recursively start building the kernel
 919 # or the modules are listed in "prepare".
 920 # A multi level approach is used. prepareN is processed before prepareN-1.
 921 # archprepare is used in arch Makefiles and when processed asm symlink,
 922 # version.h and scripts_basic is processed / created.
 923
 924 # Listed in dependency order
 925 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 926
 927 # prepare3 is used to check if we are building in a separate output directory,
 928 # and if so do:
 929 # 1) Check that make has not been executed in the kernel src $(srctree)
 930 # 2) Create the include2 directory, used for the second asm symlink
 931 prepare3: include/config/kernel.release
 932 ifneq ($(KBUILD_SRC),)
 933         @$(kecho) '  Using $(srctree) as source for kernel'
 934         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 935                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 936                 echo "  in the '$(srctree)' directory.";\
 937                 /bin/false; \
 938         fi;
 939         $(Q)if [ ! -d include2 ]; then                                  \
 940             mkdir -p include2;                                          \
 941             ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 942         fi
 943 endif
 944
 945 # prepare2 creates a makefile if using a separate output directory
 946 prepare2: prepare3 outputmakefile
 947
 948 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 949                    include/asm include/config/auto.conf
 950         $(cmd_crmodverdir)
 951
 952 archprepare: prepare1 scripts_basic
 953
 954 prepare0: archprepare FORCE
 955         $(Q)$(MAKE) $(build)=.
 956         $(Q)$(MAKE) $(build)=. missing-syscalls
 957
 958 # All the preparing..
 959 prepare: prepare0
 960
 961 # Leave this as default for preprocessing vmlinux.lds.S, which is now
 962 # done in arch/$(ARCH)/kernel/Makefile
 963
 964 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 965
 966 # The asm symlink changes when $(ARCH) changes.
 967 # Detect this and ask user to run make mrproper
 968 # If asm is a stale symlink (point to dir that does not exist) remove it
 969 define check-symlink
 970         set -e;                                                            \
 971         if [ -L include/asm ]; then                                        \
 972                 asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 973                 if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
 974                         echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 975                         echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 976                         exit 1;                                            \
 977                 fi;                                                        \
 978                 test -e $$asmlink || rm include/asm;                       \
 979         elif [ -d include/asm ]; then                                      \
 980                 echo "ERROR: $@ is a directory but a symlink was expected";\
 981                 exit 1;                                                    \
 982         fi
 983 endef
 984
 985 # We create the target directory of the symlink if it does
 986 # not exist so the test in chack-symlink works and we have a
 987 # directory for generated filesas used by some architectures.
 988 define create-symlink
 989         if [ ! -L include/asm ]; then                                      \
 990                         $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
 991                         if [ ! -d include/asm-$(SRCARCH) ]; then           \
 992                                 mkdir -p include/asm-$(SRCARCH);           \
 993                         fi;                                                \
 994                         ln -fsn asm-$(SRCARCH) $@;                         \
 995         fi
 996 endef
 997
 998 include/asm: FORCE
 999         $(Q)$(check-symlink)
1000         $(Q)$(create-symlink)
1001
1002 # Generate some files
1003 # ---------------------------------------------------------------------------
1004
1005 # KERNELRELEASE can change from a few different places, meaning version.h
1006 # needs to be updated, so this check is forced on all builds
1007
1008 uts_len := 64
1009 define filechk_utsrelease.h
1010         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1011           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1012           exit 1;                                                         \
1013         fi;                                                               \
1014         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1015 endef
1016
1017 define filechk_version.h
1018         (echo \#define LINUX_VERSION_CODE $(shell                             \
1019         expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1020         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1021 endef
1022
1023 include/linux/version.h: $(srctree)/Makefile FORCE
1024         $(call filechk,version.h)
1025
1026 include/linux/utsrelease.h: include/config/kernel.release FORCE
1027         $(call filechk,utsrelease.h)
1028
1029 PHONY += headerdep
1030 headerdep:
1031         $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1032
1033 # ---------------------------------------------------------------------------
1034
1035 PHONY += depend dep
1036 depend dep:
1037         @echo '*** Warning: make $@ is unnecessary now.'
1038
1039 # ---------------------------------------------------------------------------
1040 # Firmware install
1041 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1042 export INSTALL_FW_PATH
1043
1044 PHONY += firmware_install
1045 firmware_install: FORCE
1046         @mkdir -p $(objtree)/firmware
1047         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1048
1049 # ---------------------------------------------------------------------------
1050 # Kernel headers
1051
1052 #Default location for installed headers
1053 export INSTALL_HDR_PATH = $(objtree)/usr
1054
1055 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1056 # Find out where the Kbuild file is located to support
1057 # arch/$(ARCH)/include/asm
1058 hdr-dir = $(strip                                                         \
1059           $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1060                arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1061
1062 # If we do an all arch process set dst to asm-$(hdr-arch)
1063 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1064
1065 PHONY += __headers
1066 __headers: include/linux/version.h scripts_basic FORCE
1067         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1068
1069 PHONY += headers_install_all
1070 headers_install_all:
1071         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1072
1073 PHONY += headers_install
1074 headers_install: __headers
1075         $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1076         $(error Headers not exportable for the $(SRCARCH) architecture))
1077         $(Q)$(MAKE) $(hdr-inst)=include
1078         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1079
1080 PHONY += headers_check_all
1081 headers_check_all: headers_install_all
1082         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1083
1084 PHONY += headers_check
1085 headers_check: headers_install
1086         $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1087         $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1088
1089 # ---------------------------------------------------------------------------
1090 # Modules
1091
1092 ifdef CONFIG_MODULES
1093
1094 # By default, build modules as well
1095
1096 all: modules
1097
1098 #       Build modules
1099 #
1100 #       A module can be listed more than once in obj-m resulting in
1101 #       duplicate lines in modules.order files.  Those are removed
1102 #       using awk while concatenating to the final file.
1103
1104 PHONY += modules
1105 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1106         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1107         @$(kecho) '  Building modules, stage 2.';
1108         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1109         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1110
1111
1112 # Target to prepare building external modules
1113 PHONY += modules_prepare
1114 modules_prepare: prepare scripts
1115
1116 # Target to install modules
1117 PHONY += modules_install
1118 modules_install: _modinst_ _modinst_post
1119
1120 PHONY += _modinst_
1121 _modinst_:
1122         @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1123                 echo "Warning: you may need to install module-init-tools"; \
1124                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1125                 sleep 1; \
1126         fi
1127         @rm -rf $(MODLIB)/kernel
1128         @rm -f $(MODLIB)/source
1129         @mkdir -p $(MODLIB)/kernel
1130         @ln -s $(srctree) $(MODLIB)/source
1131         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1132                 rm -f $(MODLIB)/build ; \
1133                 ln -s $(objtree) $(MODLIB)/build ; \
1134         fi
1135         @cp -f $(objtree)/modules.order $(MODLIB)/
1136         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1137
1138 # This depmod is only for convenience to give the initial
1139 # boot a modules.dep even before / is mounted read-write.  However the
1140 # boot script depmod is the master version.
1141 PHONY += _modinst_post
1142 _modinst_post: _modinst_
1143         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1144         $(call cmd,depmod)
1145
1146 else # CONFIG_MODULES
1147
1148 # Modules not configured
1149 # ---------------------------------------------------------------------------
1150
1151 modules modules_install: FORCE
1152         @echo
1153         @echo "The present kernel configuration has modules disabled."
1154         @echo "Type 'make config' and enable loadable module support."
1155         @echo "Then build a kernel with module support enabled."
1156         @echo
1157         @exit 1
1158
1159 endif # CONFIG_MODULES
1160
1161 ###
1162 # Cleaning is done on three levels.
1163 # make clean     Delete most generated files
1164 #                Leave enough to build external modules
1165 # make mrproper  Delete the current configuration, and all generated files
1166 # make distclean Remove editor backup files, patch leftover files and the like
1167
1168 # Directories & files removed with 'make clean'
1169 CLEAN_DIRS  += $(MODVERDIR)
1170 CLEAN_FILES +=  vmlinux System.map \
1171                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1172
1173 # Directories & files removed with 'make mrproper'
1174 MRPROPER_DIRS  += include/config include2 usr/include
1175 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1176                   include/linux/autoconf.h include/linux/version.h      \
1177                   include/linux/utsrelease.h                            \
1178                   include/linux/bounds.h include/asm*/asm-offsets.h     \
1179                   Module.symvers Module.markers tags TAGS cscope*
1180
1181 # clean - Delete most, but leave enough to build external modules
1182 #
1183 clean: rm-dirs  := $(CLEAN_DIRS)
1184 clean: rm-files := $(CLEAN_FILES)
1185 clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1186
1187 PHONY += $(clean-dirs) clean archclean
1188 $(clean-dirs):
1189         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1190
1191 clean: archclean $(clean-dirs)
1192         $(call cmd,rmdirs)
1193         $(call cmd,rmfiles)
1194         @find . $(RCS_FIND_IGNORE) \
1195                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1196                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1197                 -o -name '*.symtypes' -o -name 'modules.order' \
1198                 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1199                 -type f -print | xargs rm -f
1200
1201 # mrproper - Delete all generated files, including .config
1202 #
1203 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1204 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1205 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1206
1207 PHONY += $(mrproper-dirs) mrproper archmrproper
1208 $(mrproper-dirs):
1209         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1210
1211 mrproper: clean archmrproper $(mrproper-dirs)
1212         $(call cmd,rmdirs)
1213         $(call cmd,rmfiles)
1214
1215 # distclean
1216 #
1217 PHONY += distclean
1218
1219 distclean: mrproper
1220         @find $(srctree) $(RCS_FIND_IGNORE) \
1221                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1222                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1223                 -o -name '.*.rej' -o -size 0 \
1224                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1225                 -type f -print | xargs rm -f
1226
1227
1228 # Packaging of the kernel to various formats
1229 # ---------------------------------------------------------------------------
1230 # rpm target kept for backward compatibility
1231 package-dir     := $(srctree)/scripts/package
1232
1233 %pkg: include/config/kernel.release FORCE
1234         $(Q)$(MAKE) $(build)=$(package-dir) $@
1235 rpm: include/config/kernel.release FORCE
1236         $(Q)$(MAKE) $(build)=$(package-dir) $@
1237
1238
1239 # Brief documentation of the typical targets used
1240 # ---------------------------------------------------------------------------
1241
1242 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1243 boards := $(notdir $(boards))
1244 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1245 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1246
1247 help:
1248         @echo  'Cleaning targets:'
1249         @echo  '  clean           - Remove most generated files but keep the config and'
1250         @echo  '                    enough build support to build external modules'
1251         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1252         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1253         @echo  ''
1254         @echo  'Configuration targets:'
1255         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1256         @echo  ''
1257         @echo  'Other generic targets:'
1258         @echo  '  all             - Build all targets marked with [*]'
1259         @echo  '* vmlinux         - Build the bare kernel'
1260         @echo  '* modules         - Build all modules'
1261         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1262         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1263         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1264         @echo  '  dir/            - Build all files in dir and below'
1265         @echo  '  dir/file.[ois]  - Build specified target only'
1266         @echo  '  dir/file.ko     - Build module including final link'
1267         @echo  '  prepare         - Set up for building external modules'
1268         @echo  '  tags/TAGS       - Generate tags file for editors'
1269         @echo  '  cscope          - Generate cscope index'
1270         @echo  '  kernelrelease   - Output the release version string'
1271         @echo  '  kernelversion   - Output the version stored in Makefile'
1272         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1273          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1274          echo  ''
1275         @echo  'Static analysers'
1276         @echo  '  checkstack      - Generate a list of stack hogs'
1277         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1278         @echo  '  versioncheck    - Sanity check on version.h usage'
1279         @echo  '  includecheck    - Check for duplicate included header files'
1280         @echo  '  export_report   - List the usages of all exported symbols'
1281         @echo  '  headers_check   - Sanity check on exported headers'
1282         @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1283          echo  ''
1284         @echo  'Kernel packaging:'
1285         @$(MAKE) $(build)=$(package-dir) help
1286         @echo  ''
1287         @echo  'Documentation targets:'
1288         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1289         @echo  ''
1290         @echo  'Architecture specific targets ($(SRCARCH)):'
1291         @$(if $(archhelp),$(archhelp),\
1292                 echo '  No architecture specific help defined for $(SRCARCH)')
1293         @echo  ''
1294         @$(if $(boards), \
1295                 $(foreach b, $(boards), \
1296                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1297                 echo '')
1298         @$(if $(board-dirs), \
1299                 $(foreach b, $(board-dirs), \
1300                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1301                 printf "  %-16s - Show all of the above\\n" help-boards; \
1302                 echo '')
1303
1304         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1305         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1306         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1307         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1308         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1309         @echo  ''
1310         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1311         @echo  'For further info see the ./README file'
1312
1313
1314 help-board-dirs := $(addprefix help-,$(board-dirs))
1315
1316 help-boards: $(help-board-dirs)
1317
1318 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1319
1320 $(help-board-dirs): help-%:
1321         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1322         @$(if $(boards-per-dir), \
1323                 $(foreach b, $(boards-per-dir), \
1324                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1325                 echo '')
1326
1327
1328 # Documentation targets
1329 # ---------------------------------------------------------------------------
1330 %docs: scripts_basic FORCE
1331         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1332
1333 else # KBUILD_EXTMOD
1334
1335 ###
1336 # External module support.
1337 # When building external modules the kernel used as basis is considered
1338 # read-only, and no consistency checks are made and the make
1339 # system is not used on the basis kernel. If updates are required
1340 # in the basis kernel ordinary make commands (without M=...) must
1341 # be used.
1342 #
1343 # The following are the only valid targets when building external
1344 # modules.
1345 # make M=dir clean     Delete all automatically generated files
1346 # make M=dir modules   Make all modules in specified dir
1347 # make M=dir           Same as 'make M=dir modules'
1348 # make M=dir modules_install
1349 #                      Install the modules built in the module directory
1350 #                      Assumes install directory is already created
1351
1352 # We are always building modules
1353 KBUILD_MODULES := 1
1354 PHONY += crmodverdir
1355 crmodverdir:
1356         $(cmd_crmodverdir)
1357
1358 PHONY += $(objtree)/Module.symvers
1359 $(objtree)/Module.symvers:
1360         @test -e $(objtree)/Module.symvers || ( \
1361         echo; \
1362         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1363         echo "           is missing; modules will have no dependencies and modversions."; \
1364         echo )
1365
1366 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1367 PHONY += $(module-dirs) modules
1368 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1369         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1370
1371 modules: $(module-dirs)
1372         @$(kecho) '  Building modules, stage 2.';
1373         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1374
1375 PHONY += modules_install
1376 modules_install: _emodinst_ _emodinst_post
1377
1378 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1379 PHONY += _emodinst_
1380 _emodinst_:
1381         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1382         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1383
1384 PHONY += _emodinst_post
1385 _emodinst_post: _emodinst_
1386         $(call cmd,depmod)
1387
1388 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1389
1390 PHONY += $(clean-dirs) clean
1391 $(clean-dirs):
1392         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1393
1394 clean:  rm-dirs := $(MODVERDIR)
1395 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1396 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                 -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) -r)   \
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 se we can use it in if_changed and friends.
1571 .PHONY: $(PHONY)