Makefile

   1 VERSION = 2
   2 PATCHLEVEL = 6
   3 SUBLEVEL = 9
   4 EXTRAVERSION =
   5 NAME=Zonked Quokka
   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 print "Entering directory ..."
  14 MAKEFLAGS += --no-print-directory
  15
  16 # We are using a recursive build, so we need to do a little thinking
  17 # to get the ordering right.
  18 #
  19 # Most importantly: sub-Makefiles should only ever modify files in
  20 # their own directory. If in some directory we have a dependency on
  21 # a file in another dir (which doesn't happen often, but it's of
  22 # unavoidable when linking the built-in.o targets which finally
  23 # turn into vmlinux), we will call a sub make in that other dir, and
  24 # after that we are sure that everything which is in that other dir
  25 # is now up to date.
  26 #
  27 # The only cases where we need to modify files which have global
  28 # effects are thus separated out and done before the recursive
  29 # descending is started. They are now explicitly listed as the
  30 # prepare rule.
  31
  32 # To put more focus on warnings, be less verbose as default
  33 # Use 'make V=1' to see the full commands
  34
  35 ifdef V
  36   ifeq ("$(origin V)", "command line")
  37     KBUILD_VERBOSE = $(V)
  38   endif
  39 endif
  40 ifndef KBUILD_VERBOSE
  41   KBUILD_VERBOSE = 0
  42 endif
  43
  44 # Call sparse as part of compilation of C files
  45 # Use 'make C=1' to enable sparse checking
  46
  47 ifdef C
  48   ifeq ("$(origin C)", "command line")
  49     KBUILD_CHECKSRC = $(C)
  50   endif
  51 endif
  52 ifndef KBUILD_CHECKSRC
  53   KBUILD_CHECKSRC = 0
  54 endif
  55
  56 # Use make M=dir to specify directory of external module to build
  57 # Old syntax make ... SUBDIRS=$PWD is still supported
  58 # Setting the environment variable KBUILD_EXTMOD take precedence
  59 ifdef SUBDIRS
  60   KBUILD_EXTMOD ?= $(SUBDIRS)
  61 endif
  62 ifdef M
  63   ifeq ("$(origin M)", "command line")
  64     KBUILD_EXTMOD := $(M)
  65   endif
  66 endif
  67
  68
  69 # kbuild supports saving output files in a separate directory.
  70 # To locate output files in a separate directory two syntax'es are supported.
  71 # In both cases the working directory must be the root of the kernel src.
  72 # 1) O=
  73 # Use "make O=dir/to/store/output/files/"
  74 #
  75 # 2) Set KBUILD_OUTPUT
  76 # Set the environment variable KBUILD_OUTPUT to point to the directory
  77 # where the output files shall be placed.
  78 # export KBUILD_OUTPUT=dir/to/store/output/files/
  79 # make
  80 #
  81 # The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
  82
  83
  84 # KBUILD_SRC is set on invocation of make in OBJ directory
  85 # KBUILD_SRC is not intended to be used by the regular user (for now)
  86 ifeq ($(KBUILD_SRC),)
  87
  88 # OK, Make called in directory where kernel src resides
  89 # Do we want to locate output files in a separate directory?
  90 ifdef O
  91   ifeq ("$(origin O)", "command line")
  92     KBUILD_OUTPUT := $(O)
  93   endif
  94 endif
  95
  96 # That's our default target when none is given on the command line
  97 .PHONY: _all
  98 _all:
  99
 100 ifneq ($(KBUILD_OUTPUT),)
 101 # Invoke a second make in the output directory, passing relevant variables
 102 # check that the output directory actually exists
 103 saved-output := $(KBUILD_OUTPUT)
 104 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 105 $(if $(KBUILD_OUTPUT),, \
 106      $(error output directory "$(saved-output)" does not exist))
 107
 108 .PHONY: $(MAKECMDGOALS)
 109
 110 $(filter-out _all,$(MAKECMDGOALS)) _all:
 111         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT)         \
 112         KBUILD_SRC=$(CURDIR)         KBUILD_VERBOSE=$(KBUILD_VERBOSE)   \
 113         KBUILD_CHECK=$(KBUILD_CHECK) KBUILD_EXTMOD="$(KBUILD_EXTMOD)"   \
 114         -f $(CURDIR)/Makefile $@
 115
 116 # Leave processing to above invocation of make
 117 skip-makefile := 1
 118 endif # ifneq ($(KBUILD_OUTPUT),)
 119 endif # ifeq ($(KBUILD_SRC),)
 120
 121 # We process the rest of the Makefile if this is the final invocation of make
 122 ifeq ($(skip-makefile),)
 123
 124 # If building an external module we do not care about the all: rule
 125 # but instead _all depend on modules
 126 .PHONY: all
 127 ifeq ($(KBUILD_EXTMOD),)
 128 _all: all
 129 else
 130 _all: modules
 131 endif
 132
 133 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 134 TOPDIR          := $(srctree)
 135 # FIXME - TOPDIR is obsolete, use srctree/objtree
 136 objtree         := $(CURDIR)
 137 src             := $(srctree)
 138 obj             := $(objtree)
 139
 140 VPATH           := $(srctree)
 141
 142 export srctree objtree VPATH TOPDIR
 143
 144 nullstring :=
 145 space      := $(nullstring) # end of line
 146
 147 # Take the contents of any files called localversion* and the config
 148 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
 149 # careful not to include files twice if building in the source
 150 # directory. LOCALVERSION from the command line override all of this
 151
 152 ifeq ($(objtree),$(srctree))
 153 localversion-files := $(wildcard $(srctree)/localversion*)
 154 else
 155 localversion-files := $(wildcard $(objtree)/localversion* $(srctree)/localversion*)
 156 endif
 157
 158 LOCALVERSION = $(subst $(space),, \
 159                $(shell cat /dev/null $(localversion-files)) \
 160                $(subst ",,$(CONFIG_LOCALVERSION)))
 161
 162 KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
 163
 164 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 165 # first, and if a usermode build is happening, the "ARCH=um" on the command
 166 # line overrides the setting of ARCH below.  If a native build is happening,
 167 # then ARCH is assigned, getting whatever value it gets normally, and
 168 # SUBARCH is subsequently ignored.
 169
 170 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 171                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
 172                                   -e s/s390x/s390/ -e s/parisc64/parisc/ )
 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
 193 ARCH            ?= $(SUBARCH)
 194 CROSS_COMPILE   ?=
 195
 196 # Architecture as present in compile.h
 197 UTS_MACHINE := $(ARCH)
 198
 199 # SHELL used by kbuild
 200 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 201           else if [ -x /bin/bash ]; then echo /bin/bash; \
 202           else echo sh; fi ; fi)
 203
 204 HOSTCC          = gcc
 205 HOSTCXX         = g++
 206 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 207 HOSTCXXFLAGS    = -O2
 208
 209 #       Decide whether to build built-in, modular, or both.
 210 #       Normally, just do built-in.
 211
 212 KBUILD_MODULES :=
 213 KBUILD_BUILTIN := 1
 214
 215 #       If we have only "make modules", don't compile built-in objects.
 216 #       When we're building modules with modversions, we need to consider
 217 #       the built-in objects during the descend as well, in order to
 218 #       make sure the checksums are uptodate before we record them.
 219
 220 ifeq ($(MAKECMDGOALS),modules)
 221   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 222 endif
 223
 224 #       If we have "make <whatever> modules", compile modules
 225 #       in addition to whatever we do anyway.
 226 #       Just "make" or "make all" shall build modules as well
 227
 228 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 229   KBUILD_MODULES := 1
 230 endif
 231
 232 ifeq ($(MAKECMDGOALS),)
 233   KBUILD_MODULES := 1
 234 endif
 235
 236 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
 237 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 238
 239 # Beautify output
 240 # ---------------------------------------------------------------------------
 241 #
 242 # Normally, we echo the whole command before executing it. By making
 243 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 244 # $(quiet) to choose other forms of output instead, e.g.
 245 #
 246 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 247 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 248 #
 249 # If $(quiet) is empty, the whole command will be printed.
 250 # If it is set to "quiet_", only the short version will be printed.
 251 # If it is set to "silent_", nothing wil be printed at all, since
 252 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 253 #
 254 # A simple variant is to prefix commands with $(Q) - that's usefull
 255 # for commands that shall be hidden in non-verbose mode.
 256 #
 257 #       $(Q)ln $@ :<
 258 #
 259 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 260 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 261
 262 ifeq ($(KBUILD_VERBOSE),1)
 263   quiet =
 264   Q =
 265 else
 266   quiet=quiet_
 267   Q = @
 268 endif
 269
 270 # If the user is running make -s (silent mode), suppress echoing of
 271 # commands
 272
 273 ifneq ($(findstring s,$(MAKEFLAGS)),)
 274   quiet=silent_
 275 endif
 276
 277 export quiet Q KBUILD_VERBOSE
 278
 279 ######
 280 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
 281 # See documentation in Documentation/kbuild/makefiles.txt
 282
 283 # cc-option
 284 # Usage: cflags-y += $(call gcc-option, -march=winchip-c6, -march=i586)
 285
 286 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 287              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 288
 289 # For backward compatibility
 290 check_gcc = $(warning check_gcc is deprecated - use cc-option) \
 291             $(call cc-option, $(1),$(2))
 292
 293 # cc-option-yn
 294 # Usage: flag := $(call gcc-option-yn, -march=winchip-c6)
 295 cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
 296                 > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
 297
 298 # cc-version
 299 # Usage gcc-ver := $(call cc-version $(CC))
 300 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
 301               $(if $(1), $(1), $(CC)))
 302
 303
 304 # Look for make include files relative to root of kernel src
 305 MAKEFLAGS += --include-dir=$(srctree)
 306
 307 # For maximum performance (+ possibly random breakage, uncomment
 308 # the following)
 309
 310 #MAKEFLAGS += -rR
 311
 312 # Make variables (CC, etc...)
 313
 314 AS              = $(CROSS_COMPILE)as
 315 LD              = $(CROSS_COMPILE)ld
 316 CC              = $(CROSS_COMPILE)gcc
 317 CPP             = $(CC) -E
 318 AR              = $(CROSS_COMPILE)ar
 319 NM              = $(CROSS_COMPILE)nm
 320 STRIP           = $(CROSS_COMPILE)strip
 321 OBJCOPY         = $(CROSS_COMPILE)objcopy
 322 OBJDUMP         = $(CROSS_COMPILE)objdump
 323 AWK             = awk
 324 GENKSYMS        = scripts/genksyms/genksyms
 325 DEPMOD          = /sbin/depmod
 326 KALLSYMS        = scripts/kallsyms
 327 PERL            = perl
 328 CHECK           = sparse
 329 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
 330 MODFLAGS        = -DMODULE
 331 CFLAGS_MODULE   = $(MODFLAGS)
 332 AFLAGS_MODULE   = $(MODFLAGS)
 333 LDFLAGS_MODULE  = -r
 334 CFLAGS_KERNEL   =
 335 AFLAGS_KERNEL   =
 336
 337 NOSTDINC_FLAGS  = -nostdinc -iwithprefix include
 338
 339 # Use LINUXINCLUDE when you must reference the include/ directory.
 340 # Needed to be compatible with the O= option
 341 LINUXINCLUDE    := -Iinclude \
 342                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
 343
 344 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 345
 346 CFLAGS          := -Wall -Wstrict-prototypes -Wno-trigraphs \
 347                    -fno-strict-aliasing -fno-common
 348 AFLAGS          := -D__ASSEMBLY__
 349
 350 export  VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
 351         ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 352         CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
 353         HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 354
 355 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 356 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 357 export 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 # The temporary file to save gcc -MD generated dependencies must not
 365 # contain a comma
 366 comma := ,
 367 depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
 368
 369 # Files to ignore in find ... statements
 370
 371 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc \) -prune -o
 372 RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc
 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) $(build)=scripts/basic
 381
 382 # To make sure we do not include .config for any of the *config targets
 383 # catch them early, and hand them over to scripts/kconfig/Makefile
 384 # It is allowed to specify more targets when calling make, including
 385 # mixing *config targets and build targets.
 386 # For example 'make oldconfig all'.
 387 # Detect when mixed targets is specified, and make a second invocation
 388 # of make so .config is not included in this case either (for *config).
 389
 390 no-dot-config-targets := clean mrproper distclean \
 391                          cscope TAGS tags help %docs check%
 392
 393 config-targets := 0
 394 mixed-targets  := 0
 395 dot-config     := 1
 396
 397 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 398         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 399                 dot-config := 0
 400         endif
 401 endif
 402
 403 ifeq ($(KBUILD_EXTMOD),)
 404         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 405                 config-targets := 1
 406                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 407                         mixed-targets := 1
 408                 endif
 409         endif
 410 endif
 411
 412 ifeq ($(mixed-targets),1)
 413 # ===========================================================================
 414 # We're called with mixed targets (*config and build targets).
 415 # Handle them one by one.
 416
 417 %:: FORCE
 418         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 419
 420 else
 421 ifeq ($(config-targets),1)
 422 # ===========================================================================
 423 # *config targets only - make sure prerequisites are updated, and descend
 424 # in scripts/kconfig to make the *config target
 425
 426 config: scripts_basic FORCE
 427         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 428 %config: scripts_basic FORCE
 429         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 430
 431 else
 432 # ===========================================================================
 433 # Build targets only - this includes vmlinux, arch specific targets, clean
 434 # targets and others. In general all targets except *config targets.
 435
 436 ifeq ($(KBUILD_EXTMOD),)
 437 # Additional helpers built in scripts/
 438 # Carefully list dependencies so we do not try to build scripts twice
 439 # in parrallel
 440 .PHONY: scripts
 441 scripts: scripts_basic include/config/MARKER
 442         $(Q)$(MAKE) $(build)=$(@)
 443
 444 scripts_basic: include/linux/autoconf.h
 445
 446 # Objects we will link into vmlinux / subdirs we need to visit
 447 init-y          := init/
 448 drivers-y       := drivers/ sound/
 449 net-y           := net/
 450 libs-y          := lib/
 451 core-y          := usr/
 452 endif # KBUILD_EXTMOD
 453
 454 ifeq ($(dot-config),1)
 455 # In this section, we need .config
 456
 457 # Read in dependencies to all Kconfig* files, make sure to run
 458 # oldconfig if changes are detected.
 459 -include .config.cmd
 460
 461 include .config
 462
 463 # If .config needs to be updated, it will be done via the dependency
 464 # that autoconf has on .config.
 465 # To avoid any implicit rule to kick in, define an empty command
 466 .config: ;
 467
 468 # If .config is newer than include/linux/autoconf.h, someone tinkered
 469 # with it and forgot to run make oldconfig
 470 include/linux/autoconf.h: .config
 471         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 472 else
 473 # Dummy target needed, because used as prerequisite
 474 include/linux/autoconf.h: ;
 475 endif
 476
 477 # The all: target is the default when no target is given on the
 478 # command line.
 479 # This allow a user to issue only 'make' to build a kernel including modules
 480 # Defaults vmlinux but it is usually overriden in the arch makefile
 481 all: vmlinux
 482
 483 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 484 CFLAGS          += -Os
 485 else
 486 CFLAGS          += -O2
 487 endif
 488
 489 ifndef CONFIG_FRAME_POINTER
 490 CFLAGS          += -fomit-frame-pointer
 491 endif
 492
 493 ifdef CONFIG_DEBUG_INFO
 494 CFLAGS          += -g
 495 endif
 496
 497 # warn about C99 declaration after statement
 498 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 499
 500 include $(srctree)/arch/$(ARCH)/Makefile
 501
 502 # Default kernel image to build when no specific target is given.
 503 # KBUILD_IMAGE may be overruled on the commandline or
 504 # set in the environment
 505 # Also any assingments in arch/$(ARCH)/Makefiel take precedence over
 506 # this default value
 507 export KBUILD_IMAGE ?= vmlinux
 508
 509 #
 510 # INSTALL_PATH specifies where to place the updated kernel and system map
 511 # images.  Uncomment if you want to place them anywhere other than root.
 512 #
 513
 514 #export INSTALL_PATH=/boot
 515
 516 #
 517 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 518 # relocations required by build roots.  This is not defined in the
 519 # makefile but the arguement can be passed to make if needed.
 520 #
 521
 522 MODLIB  := $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 523 export MODLIB
 524
 525
 526 ifeq ($(KBUILD_EXTMOD),)
 527 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/
 528
 529 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 530                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 531                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
 532
 533 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 534                      $(init-n) $(init-) \
 535                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
 536                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 537
 538 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 539 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 540 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 541 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 542 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 543 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 544 libs-y          := $(libs-y1) $(libs-y2)
 545
 546 # Build vmlinux
 547 # ---------------------------------------------------------------------------
 548 # vmlinux is build from the objects selected by $(vmlinux-init) and
 549 # $(vmlinux-main). Most are built-in.o files from top-level directories
 550 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
 551 # Ordering when linking is important, and $(vmlinux-init) must be first.
 552 #
 553 # vmlinux
 554 #   ^
 555 #   |
 556 #   +-< $(vmlinux-init)
 557 #   |   +--< init/version.o + more
 558 #   |
 559 #   +--< $(vmlinux-main)
 560 #   |    +--< driver/built-in.o mm/built-in.o + more
 561 #   |
 562 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 563 #
 564 # vmlinux version (uname -v) cannot be updated during normal
 565 # descending-into-subdirs phase since we do not yet know if we need to
 566 # update vmlinux.
 567 # Therefore this step is delayed until just before final link of vmlinux -
 568 # except in the kallsyms case where it is done just before adding the
 569 # symbols to the kernel.
 570 #
 571 # System.map is generated to document addresses of all kernel symbols
 572
 573 vmlinux-init := $(head-y) $(init-y)
 574 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 575 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 576 vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
 577
 578 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
 579 # May be overridden by arch/$(ARCH)/Makefile
 580 quiet_cmd_vmlinux__ ?= LD      $@
 581       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 582       -T $(vmlinux-lds) $(vmlinux-init)                          \
 583       --start-group $(vmlinux-main) --end-group                  \
 584       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 585
 586 # Generate new vmlinux version
 587 quiet_cmd_vmlinux_version = GEN     .version
 588       cmd_vmlinux_version = set -e;                     \
 589         . $(srctree)/scripts/mkversion > .tmp_version;  \
 590         mv -f .tmp_version .version;                    \
 591         $(MAKE) $(build)=init
 592
 593 # Generate System.map
 594 quiet_cmd_sysmap = SYSMAP
 595       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 596
 597 # Link of vmlinux
 598 # If CONFIG_KALLSYMS is set .version is already updated
 599 # Generate System.map and verify that the content is consistent
 600
 601 define rule_vmlinux__
 602         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 603
 604         $(call cmd,vmlinux__)
 605         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 606
 607         $(Q)$(if $($(quiet)cmd_sysmap),                 \
 608           echo '  $($(quiet)cmd_sysmap) System.map' &&) \
 609         $(cmd_sysmap) $@ System.map;                    \
 610         if [ $$? -ne 0 ]; then                          \
 611                 rm -f $@;                               \
 612                 /bin/false;                             \
 613         fi;
 614         $(verify_kallsyms)
 615 endef
 616
 617
 618 ifdef CONFIG_KALLSYMS
 619 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 620 # It's a three stage process:
 621 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 622 #   empty
 623 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
 624 #   the right size - vmlinux version (uname -v) is updated during this step
 625 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 626 #   but due to the added section, some addresses have shifted.
 627 #   From here, we generate a correct .tmp_kallsyms2.o
 628 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 629 # o Verify that the System.map from vmlinux matches the map from
 630 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 631 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 632 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 633 #   temporary bypass to allow the kernel to be built while the
 634 #   maintainers work out what went wrong with kallsyms.
 635
 636 ifdef CONFIG_KALLSYMS_EXTRA_PASS
 637 last_kallsyms := 3
 638 else
 639 last_kallsyms := 2
 640 endif
 641
 642 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 643
 644 define verify_kallsyms
 645         $(Q)$(if $($(quiet)cmd_sysmap),                       \
 646           echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
 647           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 648         $(Q)cmp -s System.map .tmp_System.map ||              \
 649                 (echo Inconsistent kallsyms data;             \
 650                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
 651                  rm .tmp_kallsyms* ; /bin/false )
 652 endef
 653
 654 # Update vmlinux version before link
 655 # Use + in front of this rule to silent warning about make -j1
 656 cmd_ksym_ld = $(cmd_vmlinux__)
 657 define rule_ksym_ld
 658         +$(call cmd,vmlinux_version)
 659         $(call cmd,vmlinux__)
 660         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 661 endef
 662
 663 # Generate .S file with all kernel symbols
 664 quiet_cmd_kallsyms = KSYM    $@
 665       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 666                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 667
 668 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 669         $(call if_changed_dep,as_o_S)
 670
 671 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 672         $(call cmd,kallsyms)
 673
 674 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 675 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 676         $(call if_changed_rule,ksym_ld)
 677
 678 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 679         $(call if_changed,vmlinux__)
 680
 681 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 682         $(call if_changed,vmlinux__)
 683
 684 # Needs to visit scripts/ before $(KALLSYMS) can be used.
 685 $(KALLSYMS): scripts ;
 686
 687 endif # ifdef CONFIG_KALLSYMS
 688
 689 # vmlinux image - including updated kernel symbols
 690 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
 691         $(call if_changed_rule,vmlinux__)
 692
 693 # The actual objects are generated when descending,
 694 # make sure no implicit rule kicks in
 695 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 696
 697 # Handle descending into subdirectories listed in $(vmlinux-dirs)
 698 # Preset locale variables to speed up the build process. Limit locale
 699 # tweaks to this spot to avoid wrong language settings when running
 700 # make menuconfig etc.
 701 # Error messages still appears in the original language
 702
 703 .PHONY: $(vmlinux-dirs)
 704 $(vmlinux-dirs): prepare-all scripts
 705         $(Q)$(MAKE) $(build)=$@
 706
 707 # Things we need to do before we recursively start building the kernel
 708 # or the modules are listed in "prepare-all".
 709 # A multi level approach is used. prepare1 is updated first, then prepare0.
 710 # prepare-all is the collection point for the prepare targets.
 711
 712 .PHONY: prepare-all prepare prepare0 prepare1 prepare2
 713
 714 # prepare 2 generate Makefile to be placed in output directory, if
 715 # using a seperate output directory. This allows convinient use
 716 # of make in output directory
 717 prepare2:
 718         $(Q)if /usr/bin/env test ! $(srctree) -ef $(objtree); then \
 719         $(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
 720             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
 721             > $(objtree)/Makefile;                                 \
 722         fi
 723
 724 # prepare1 is used to check if we are building in a separate output directory,
 725 # and if so do:
 726 # 1) Check that make has not been executed in the kernel src $(srctree)
 727 # 2) Create the include2 directory, used for the second asm symlink
 728
 729 prepare1: prepare2
 730 ifneq ($(KBUILD_SRC),)
 731         @echo '  Using $(srctree) as source for kernel'
 732         $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
 733                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
 734                 echo "  in the '$(srctree)' directory.";\
 735                 /bin/false; \
 736         fi;
 737         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 738         $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
 739 endif
 740
 741 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
 742 ifneq ($(KBUILD_MODULES),)
 743         $(Q)rm -rf $(MODVERDIR)
 744         $(Q)mkdir -p $(MODVERDIR)
 745 endif
 746
 747 # All the preparing..
 748 prepare-all: prepare0 prepare
 749
 750 #       Leave this as default for preprocessing vmlinux.lds.S, which is now
 751 #       done in arch/$(ARCH)/kernel/Makefile
 752
 753 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 754
 755 # Single targets
 756 # ---------------------------------------------------------------------------
 757
 758 %.s: %.c scripts FORCE
 759         $(Q)$(MAKE) $(build)=$(@D) $@
 760 %.i: %.c scripts FORCE
 761         $(Q)$(MAKE) $(build)=$(@D) $@
 762 %.o: %.c scripts FORCE
 763         $(Q)$(MAKE) $(build)=$(@D) $@
 764 %/:      scripts prepare FORCE
 765         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
 766 %.lst: %.c scripts FORCE
 767         $(Q)$(MAKE) $(build)=$(@D) $@
 768 %.s: %.S scripts FORCE
 769         $(Q)$(MAKE) $(build)=$(@D) $@
 770 %.o: %.S scripts FORCE
 771         $(Q)$(MAKE) $(build)=$(@D) $@
 772
 773 #       FIXME: The asm symlink changes when $(ARCH) changes. That's
 774 #       hard to detect, but I suppose "make mrproper" is a good idea
 775 #       before switching between archs anyway.
 776
 777 include/asm:
 778         @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
 779         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
 780         @ln -fsn asm-$(ARCH) $@
 781
 782 #       Split autoconf.h into include/linux/config/*
 783
 784 include/config/MARKER: include/linux/autoconf.h
 785         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
 786         @scripts/basic/split-include include/linux/autoconf.h include/config
 787         @touch $@
 788
 789 # Generate some files
 790 # ---------------------------------------------------------------------------
 791
 792 # KERNELRELEASE can change from a few different places, meaning version.h
 793 # needs to be updated, so this check is forced on all builds
 794
 795 uts_len := 64
 796
 797 define filechk_version.h
 798         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 799           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 800           exit 1; \
 801         fi; \
 802         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 803           echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 804          echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
 805         )
 806 endef
 807
 808 include/linux/version.h: $(srctree)/Makefile FORCE
 809         $(call filechk,version.h)
 810
 811 # ---------------------------------------------------------------------------
 812
 813 .PHONY: depend dep
 814 depend dep:
 815         @echo '*** Warning: make $@ is unnecessary now.'
 816
 817 # ---------------------------------------------------------------------------
 818 # Modules
 819
 820 ifdef CONFIG_MODULES
 821
 822 #       By default, build modules as well
 823
 824 all: modules
 825
 826 #       Build modules
 827
 828 .PHONY: modules
 829 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 830         @echo '  Building modules, stage 2.';
 831         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 832
 833
 834 # Target to prepare building external modules
 835 .PHONY: modules_prepare
 836 modules_prepare: prepare-all scripts
 837
 838 # Target to install modules
 839 .PHONY: modules_install
 840 modules_install: _modinst_ _modinst_post
 841
 842 .PHONY: _modinst_
 843 _modinst_:
 844         @if [ -z "`$(DEPMOD) -V | grep module-init-tools`" ]; then \
 845                 echo "Warning: you may need to install module-init-tools"; \
 846                 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
 847                 sleep 1; \
 848         fi
 849         @rm -rf $(MODLIB)/kernel
 850         @rm -f $(MODLIB)/source
 851         @mkdir -p $(MODLIB)/kernel
 852         @ln -s $(srctree) $(MODLIB)/source
 853         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 854                 rm -f $(MODLIB)/build ; \
 855                 ln -s $(objtree) $(MODLIB)/build ; \
 856         fi
 857         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
 858
 859 # If System.map exists, run depmod.  This deliberately does not have a
 860 # dependency on System.map since that would run the dependency tree on
 861 # vmlinux.  This depmod is only for convenience to give the initial
 862 # boot a modules.dep even before / is mounted read-write.  However the
 863 # boot script depmod is the master version.
 864 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
 865 depmod_opts     :=
 866 else
 867 depmod_opts     := -b $(INSTALL_MOD_PATH) -r
 868 endif
 869 .PHONY: _modinst_post
 870 _modinst_post: _modinst_
 871         if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 872
 873 else # CONFIG_MODULES
 874
 875 # Modules not configured
 876 # ---------------------------------------------------------------------------
 877
 878 modules modules_install: FORCE
 879         @echo
 880         @echo "The present kernel configuration has modules disabled."
 881         @echo "Type 'make config' and enable loadable module support."
 882         @echo "Then build a kernel with module support enabled."
 883         @echo
 884         @exit 1
 885
 886 endif # CONFIG_MODULES
 887
 888 # Generate asm-offsets.h
 889 # ---------------------------------------------------------------------------
 890
 891 define filechk_gen-asm-offsets
 892         (set -e; \
 893          echo "#ifndef __ASM_OFFSETS_H__"; \
 894          echo "#define __ASM_OFFSETS_H__"; \
 895          echo "/*"; \
 896          echo " * DO NOT MODIFY."; \
 897          echo " *"; \
 898          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 899          echo " *"; \
 900          echo " */"; \
 901          echo ""; \
 902          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 903          echo ""; \
 904          echo "#endif" )
 905 endef
 906
 907
 908 ###
 909 # Cleaning is done on three levels.
 910 # make clean     Delete most generated files
 911 #                Leave enough to build external modules
 912 # make mrproper  Delete the current configuration, and all generated files
 913 # make distclean Remove editor backup files, patch leftover files and the like
 914
 915 # Directories & files removed with 'make clean'
 916 CLEAN_DIRS  += $(MODVERDIR)
 917 CLEAN_FILES +=  vmlinux System.map \
 918                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 919
 920 # Directories & files removed with 'make mrproper'
 921 MRPROPER_DIRS  += include/config include2
 922 MRPROPER_FILES += .config .config.old include/asm .version \
 923                   include/linux/autoconf.h include/linux/version.h \
 924                   Module.symvers tags TAGS cscope*
 925
 926 # clean - Delete most, but leave enough to build external modules
 927 #
 928 clean: rm-dirs  := $(CLEAN_DIRS)
 929 clean: rm-files := $(CLEAN_FILES)
 930 clean-dirs      := $(addprefix _clean_,$(vmlinux-alldirs))
 931
 932 .PHONY: $(clean-dirs) clean archclean
 933 $(clean-dirs):
 934         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 935
 936 clean: archclean $(clean-dirs)
 937         $(call cmd,rmdirs)
 938         $(call cmd,rmfiles)
 939         @find . $(RCS_FIND_IGNORE) \
 940                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 941                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 942                 -type f -print | xargs rm -f
 943
 944 # mrproper - Delete all generated files, including .config
 945 #
 946 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 947 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 948 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
 949
 950 .PHONY: $(mrproper-dirs) mrproper archmrproper
 951 $(mrproper-dirs):
 952         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 953
 954 mrproper: clean archmrproper $(mrproper-dirs)
 955         $(call cmd,rmdirs)
 956         $(call cmd,rmfiles)
 957
 958 # distclean
 959 #
 960 .PHONY: distclean
 961
 962 distclean: mrproper
 963         @find $(srctree) $(RCS_FIND_IGNORE) \
 964                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 965                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 966                 -o -name '.*.rej' -o -size 0 \
 967                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 968                 -type f -print | xargs rm -f
 969
 970
 971 # Packaging of the kernel to various formats
 972 # ---------------------------------------------------------------------------
 973 # rpm target kept for backward compatibility
 974 package-dir     := $(srctree)/scripts/package
 975
 976 .PHONY: %-pkg rpm
 977
 978 %pkg: FORCE
 979         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
 980 rpm: FORCE
 981         $(Q)$(MAKE) -f $(package-dir)/Makefile $@
 982
 983
 984 # Brief documentation of the typical targets used
 985 # ---------------------------------------------------------------------------
 986
 987 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
 988 boards := $(notdir $(boards))
 989
 990 help:
 991         @echo  'Cleaning targets:'
 992         @echo  '  clean           - remove most generated files but keep the config'
 993         @echo  '  mrproper        - remove all generated files + config + various backup files'
 994         @echo  ''
 995         @echo  'Configuration targets:'
 996         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
 997         @echo  ''
 998         @echo  'Other generic targets:'
 999         @echo  '  all             - Build all targets marked with [*]'
1000         @echo  '* vmlinux         - Build the bare kernel'
1001         @echo  '* modules         - Build all modules'
1002         @echo  '  modules_install - Install all modules'
1003         @echo  '  dir/            - Build all files in dir and below'
1004         @echo  '  dir/file.[ois]  - Build specified target only'
1005         @echo  '  rpm             - Build a kernel as an RPM package'
1006         @echo  '  tags/TAGS       - Generate tags file for editors'
1007         @echo  '  cscope          - Generate cscope index'
1008         @echo  ''
1009         @echo  'Static analysers'
1010         @echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1011         @echo  '                    and init sections from non-init sections'
1012         @echo  '  checkstack      - Generate a list of stack hogs'
1013         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1014         @echo  ''
1015         @echo  'Kernel packaging:'
1016         @$(MAKE) -f $(package-dir)/Makefile help
1017         @echo  ''
1018         @echo  'Documentation targets:'
1019         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1020         @echo  ''
1021         @echo  'Architecture specific targets ($(ARCH)):'
1022         @$(if $(archhelp),$(archhelp),\
1023                 echo '  No architecture specific help defined for $(ARCH)')
1024         @echo  ''
1025         @$(if $(boards), \
1026                 $(foreach b, $(boards), \
1027                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1028                 echo '')
1029
1030         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1031         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1032         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1033         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1034         @echo  ''
1035         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1036         @echo  'For further info see the ./README file'
1037
1038
1039 # Documentation targets
1040 # ---------------------------------------------------------------------------
1041 %docs: scripts_basic FORCE
1042         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1043
1044 else # KBUILD_EXTMOD
1045
1046 ###
1047 # External module support.
1048 # When building external modules the kernel used as basis is considered
1049 # read-only, and no consistency checks are made and the make
1050 # system is not used on the basis kernel. If updates are required
1051 # in the basis kernel ordinary make commands (without M=...) must
1052 # be used.
1053 #
1054 # The following are the only valid targets when building external
1055 # modules.
1056 # make M=dir clean     Delete all automatically generated files
1057 # make M=dir modules   Make all modules in specified dir
1058 # make M=dir           Same as 'make M=dir modules'
1059 # make M=dir modules_install
1060 #                      Install the modules build in the module directory
1061 #                      Assumes install directory is already created
1062
1063 # We are always building modules
1064 KBUILD_MODULES := 1
1065 .PHONY: crmodverdir
1066 crmodverdir:
1067         $(Q)mkdir -p $(MODVERDIR)
1068
1069 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1070 .PHONY: $(module-dirs) modules
1071 $(module-dirs): crmodverdir
1072         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1073
1074 modules: $(module-dirs)
1075         @echo '  Building modules, stage 2.';
1076         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1077
1078 .PHONY: modules_install
1079 modules_install:
1080         $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1081
1082 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1083
1084 .PHONY: $(clean-dirs) clean
1085 $(clean-dirs):
1086         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1087
1088 clean:  rm-dirs := $(MODVERDIR)
1089 clean: $(clean-dirs)
1090         $(call cmd,rmdirs)
1091         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1092                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1093                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1094                 -type f -print | xargs rm -f
1095
1096 help:
1097         @echo  '  Building external modules.'
1098         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1099         @echo  ''
1100         @echo  '  modules         - default target, build the module(s)'
1101         @echo  '  modules_install - install the module'
1102         @echo  '  clean           - remove generated files in module directory only'
1103         @echo  ''
1104 endif # KBUILD_EXTMOD
1105
1106 # Generate tags for editors
1107 # ---------------------------------------------------------------------------
1108
1109 define all-sources
1110         ( find $(srctree) $(RCS_FIND_IGNORE) \
1111                \( -name include -o -name arch \) -prune -o \
1112                -name '*.[chS]' -print; \
1113           find $(srctree)/arch/$(ARCH) $(RCS_FIND_IGNORE) \
1114                -name '*.[chS]' -print; \
1115           find $(srctree)/security/selinux/include $(RCS_FIND_IGNORE) \
1116                -name '*.[chS]' -print; \
1117           find $(srctree)/include $(RCS_FIND_IGNORE) \
1118                \( -name config -o -name 'asm-*' \) -prune \
1119                -o -name '*.[chS]' -print; \
1120           find $(srctree)/include/asm-$(ARCH) $(RCS_FIND_IGNORE) \
1121                -name '*.[chS]' -print; \
1122           find $(srctree)/include/asm-generic $(RCS_FIND_IGNORE) \
1123                -name '*.[chS]' -print )
1124 endef
1125
1126 quiet_cmd_cscope-file = FILELST cscope.files
1127       cmd_cscope-file = $(all-sources) > cscope.files
1128
1129 quiet_cmd_cscope = MAKE    cscope.out
1130       cmd_cscope = cscope -k -b -q
1131
1132 cscope: FORCE
1133         $(call cmd,cscope-file)
1134         $(call cmd,cscope)
1135
1136 quiet_cmd_TAGS = MAKE   $@
1137 cmd_TAGS = $(all-sources) | etags -
1138
1139 #       Exuberant ctags works better with -I
1140
1141 quiet_cmd_tags = MAKE   $@
1142 define cmd_tags
1143         rm -f $@; \
1144         CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
1145         $(all-sources) | xargs ctags $$CTAGSF -a
1146 endef
1147
1148 TAGS: FORCE
1149         $(call cmd,TAGS)
1150
1151 tags: FORCE
1152         $(call cmd,tags)
1153
1154
1155 # Scripts to check various things for consistency
1156 # ---------------------------------------------------------------------------
1157
1158 configcheck:
1159         find * $(RCS_FIND_IGNORE) \
1160                 -name '*.[hcS]' -type f -print | sort \
1161                 | xargs $(PERL) -w scripts/checkconfig.pl
1162
1163 includecheck:
1164         find * $(RCS_FIND_IGNORE) \
1165                 -name '*.[hcS]' -type f -print | sort \
1166                 | xargs $(PERL) -w scripts/checkincludes.pl
1167
1168 versioncheck:
1169         find * $(RCS_FIND_IGNORE) \
1170                 -name '*.[hcS]' -type f -print | sort \
1171                 | xargs $(PERL) -w scripts/checkversion.pl
1172
1173 buildcheck:
1174         $(PERL) $(srctree)/scripts/reference_discarded.pl
1175         $(PERL) $(srctree)/scripts/reference_init.pl
1176
1177 namespacecheck:
1178         $(PERL) $(srctree)/scripts/namespace.pl
1179
1180 endif #ifeq ($(config-targets),1)
1181 endif #ifeq ($(mixed-targets),1)
1182
1183 .PHONY: checkstack
1184 checkstack:
1185         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1186         $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1187
1188 # FIXME Should go into a make.lib or something
1189 # ===========================================================================
1190
1191 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1192       cmd_rmdirs = rm -rf $(rm-dirs)
1193
1194 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1195       cmd_rmfiles = rm -f $(rm-files)
1196
1197
1198 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1199           $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1200           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1201
1202 quiet_cmd_as_o_S = AS      $@
1203 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1204
1205 # read all saved command lines
1206
1207 targets := $(wildcard $(sort $(targets)))
1208 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1209
1210 ifneq ($(cmd_files),)
1211   $(cmd_files): ;       # Do not try to update included dependency files
1212   include $(cmd_files)
1213 endif
1214
1215 # Execute command and generate cmd file
1216 if_changed = $(if $(strip $? \
1217                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1218                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1219         @set -e; \
1220         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1221         $(cmd_$(1)); \
1222         echo 'cmd_$@ := $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).cmd)
1223
1224
1225 # execute the command and also postprocess generated .d dependencies
1226 # file
1227 if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
1228                           $(filter-out $(cmd_$(1)),$(cmd_$@))\
1229                           $(filter-out $(cmd_$@),$(cmd_$(1)))),\
1230         $(Q)set -e; \
1231         $(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))';) \
1232         $(cmd_$(1)); \
1233         scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \
1234         rm -f $(depfile); \
1235         mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
1236
1237 # Usage: $(call if_changed_rule,foo)
1238 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1239 # and if so will execute $(rule_foo)
1240
1241 if_changed_rule = $(if $(strip $? \
1242                                $(filter-out $(cmd_$(1)),$(cmd_$(@F)))\
1243                                $(filter-out $(cmd_$(@F)),$(cmd_$(1)))),\
1244                        $(Q)$(rule_$(1)))
1245
1246 # If quiet is set, only print short version of command
1247
1248 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
1249
1250 # filechk is used to check if the content of a generated file is updated.
1251 # Sample usage:
1252 # define filechk_sample
1253 #       echo $KERNELRELEASE
1254 # endef
1255 # version.h : Makefile
1256 #       $(call filechk,sample)
1257 # The rule defined shall write to stdout the content of the new file.
1258 # The existing file will be compared with the new one.
1259 # - If no file exist it is created
1260 # - If the content differ the new file is used
1261 # - If they are equal no change, and no timestamp update
1262
1263 define filechk
1264         @set -e;                                \
1265         echo '  CHK     $@';                    \
1266         mkdir -p $(dir $@);                     \
1267         $(filechk_$(1)) < $< > $@.tmp;          \
1268         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
1269                 rm -f $@.tmp;                   \
1270         else                                    \
1271                 echo '  UPD     $@';            \
1272                 mv -f $@.tmp $@;                \
1273         fi
1274 endef
1275
1276 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1277 # Usage:
1278 # $(Q)$(MAKE) $(build)=dir
1279 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
1280
1281 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1282 # Usage:
1283 # $(Q)$(MAKE) $(clean)=dir
1284 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1285
1286 #       $(call descend,<dir>,<target>)
1287 #       Recursively call a sub-make in <dir> with target <target>
1288 # Usage is deprecated, because make does not see this as an invocation of make.
1289 descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
1290
1291 endif   # skip-makefile
1292
1293 FORCE: