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   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 39
   4EXTRAVERSION = .1
   5NAME = Flesh-Eating Bats with Fangs
   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 ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# Avoid funny character set dependencies
  20unexport LC_ALL
  21LC_COLLATE=C
  22LC_NUMERIC=C
  23export LC_COLLATE LC_NUMERIC
  24
  25# We are using a recursive build, so we need to do a little thinking
  26# to get the ordering right.
  27#
  28# Most importantly: sub-Makefiles should only ever modify files in
  29# their own directory. If in some directory we have a dependency on
  30# a file in another dir (which doesn't happen often, but it's often
  31# unavoidable when linking the built-in.o targets which finally
  32# turn into vmlinux), we will call a sub make in that other dir, and
  33# after that we are sure that everything which is in that other dir
  34# is now up to date.
  35#
  36# The only cases where we need to modify files which have global
  37# effects are thus separated out and done before the recursive
  38# descending is started. They are now explicitly listed as the
  39# prepare rule.
  40
  41# To put more focus on warnings, be less verbose as default
  42# Use 'make V=1' to see the full commands
  43
  44ifeq ("$(origin V)", "command line")
  45  KBUILD_VERBOSE = $(V)
  46endif
  47ifndef KBUILD_VERBOSE
  48  KBUILD_VERBOSE = 0
  49endif
  50
  51# Call a source code checker (by default, "sparse") as part of the
  52# C compilation.
  53#
  54# Use 'make C=1' to enable checking of only re-compiled files.
  55# Use 'make C=2' to enable checking of *all* source files, regardless
  56# of whether they are re-compiled or not.
  57#
  58# See the file "Documentation/sparse.txt" for more details, including
  59# where to get the "sparse" utility.
  60
  61ifeq ("$(origin C)", "command line")
  62  KBUILD_CHECKSRC = $(C)
  63endif
  64ifndef KBUILD_CHECKSRC
  65  KBUILD_CHECKSRC = 0
  66endif
  67
  68# Use make M=dir to specify directory of external module to build
  69# Old syntax make ... SUBDIRS=$PWD is still supported
  70# Setting the environment variable KBUILD_EXTMOD take precedence
  71ifdef SUBDIRS
  72  KBUILD_EXTMOD ?= $(SUBDIRS)
  73endif
  74
  75ifeq ("$(origin M)", "command line")
  76  KBUILD_EXTMOD := $(M)
  77endif
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(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?
 101ifeq ("$(origin O)", "command line")
 102  KBUILD_OUTPUT := $(O)
 103endif
 104
 105ifeq ("$(origin W)", "command line")
 106  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := 1
 107endif
 108
 109# That's our default target when none is given on the command line
 110PHONY := _all
 111_all:
 112
 113# Cancel implicit rules on top Makefile
 114$(CURDIR)/Makefile Makefile: ;
 115
 116ifneq ($(KBUILD_OUTPUT),)
 117# Invoke a second make in the output directory, passing relevant variables
 118# check that the output directory actually exists
 119saved-output := $(KBUILD_OUTPUT)
 120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121$(if $(KBUILD_OUTPUT),, \
 122     $(error output directory "$(saved-output)" does not exist))
 123
 124PHONY += $(MAKECMDGOALS) sub-make
 125
 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127        $(Q)@:
 128
 129sub-make: FORCE
 130        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131        KBUILD_SRC=$(CURDIR) \
 132        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133        $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135# Leave processing to above invocation of make
 136skip-makefile := 1
 137endif # ifneq ($(KBUILD_OUTPUT),)
 138endif # ifeq ($(KBUILD_SRC),)
 139
 140# We process the rest of the Makefile if this is the final invocation of make
 141ifeq ($(skip-makefile),)
 142
 143# If building an external module we do not care about the all: rule
 144# but instead _all depend on modules
 145PHONY += all
 146ifeq ($(KBUILD_EXTMOD),)
 147_all: all
 148else
 149_all: modules
 150endif
 151
 152srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153objtree         := $(CURDIR)
 154src             := $(srctree)
 155obj             := $(objtree)
 156
 157VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159export srctree objtree VPATH
 160
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 167
 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                  -e s/sh[234].*/sh/ )
 173
 174# Cross compiling and selecting different set of gcc/bin-utils
 175# ---------------------------------------------------------------------------
 176#
 177# When performing cross compilation for other architectures ARCH shall be set
 178# to the target architecture. (See arch/* for the possibilities).
 179# ARCH can be set during invocation of make:
 180# make ARCH=ia64
 181# Another way is to have ARCH set in the environment.
 182# The default ARCH is the host where make is executed.
 183
 184# CROSS_COMPILE specify the prefix used for all executables used
 185# during compilation. Only gcc and related bin-utils executables
 186# are prefixed with $(CROSS_COMPILE).
 187# CROSS_COMPILE can be set on the command line
 188# make CROSS_COMPILE=ia64-linux-
 189# Alternatively CROSS_COMPILE can be set in the environment.
 190# A third alternative is to store a setting in .config so that plain
 191# "make" in the configured kernel build directory always uses that.
 192# Default value for CROSS_COMPILE is not to prefix executables
 193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 194export KBUILD_BUILDHOST := $(SUBARCH)
 195ARCH            ?= $(SUBARCH)
 196CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198# Architecture as present in compile.h
 199UTS_MACHINE     := $(ARCH)
 200SRCARCH         := $(ARCH)
 201
 202# Additional ARCH settings for x86
 203ifeq ($(ARCH),i386)
 204        SRCARCH := x86
 205endif
 206ifeq ($(ARCH),x86_64)
 207        SRCARCH := x86
 208endif
 209
 210# Additional ARCH settings for sparc
 211ifeq ($(ARCH),sparc32)
 212       SRCARCH := sparc
 213endif
 214ifeq ($(ARCH),sparc64)
 215       SRCARCH := sparc
 216endif
 217
 218# Additional ARCH settings for sh
 219ifeq ($(ARCH),sh64)
 220       SRCARCH := sh
 221endif
 222
 223# Where to locate arch specific headers
 224hdr-arch  := $(SRCARCH)
 225
 226ifeq ($(ARCH),m68knommu)
 227       hdr-arch  := m68k
 228endif
 229
 230KCONFIG_CONFIG  ?= .config
 231export KCONFIG_CONFIG
 232
 233# SHELL used by kbuild
 234CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 235          else if [ -x /bin/bash ]; then echo /bin/bash; \
 236          else echo sh; fi ; fi)
 237
 238HOSTCC       = gcc
 239HOSTCXX      = g++
 240HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 241HOSTCXXFLAGS = -O2
 242
 243# Decide whether to build built-in, modular, or both.
 244# Normally, just do built-in.
 245
 246KBUILD_MODULES :=
 247KBUILD_BUILTIN := 1
 248
 249#       If we have only "make modules", don't compile built-in objects.
 250#       When we're building modules with modversions, we need to consider
 251#       the built-in objects during the descend as well, in order to
 252#       make sure the checksums are up to date before we record them.
 253
 254ifeq ($(MAKECMDGOALS),modules)
 255  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 256endif
 257
 258#       If we have "make <whatever> modules", compile modules
 259#       in addition to whatever we do anyway.
 260#       Just "make" or "make all" shall build modules as well
 261
 262ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 263  KBUILD_MODULES := 1
 264endif
 265
 266ifeq ($(MAKECMDGOALS),)
 267  KBUILD_MODULES := 1
 268endif
 269
 270export KBUILD_MODULES KBUILD_BUILTIN
 271export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 272
 273# Beautify output
 274# ---------------------------------------------------------------------------
 275#
 276# Normally, we echo the whole command before executing it. By making
 277# that echo $($(quiet)$(cmd)), we now have the possibility to set
 278# $(quiet) to choose other forms of output instead, e.g.
 279#
 280#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 281#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 282#
 283# If $(quiet) is empty, the whole command will be printed.
 284# If it is set to "quiet_", only the short version will be printed. 
 285# If it is set to "silent_", nothing will be printed at all, since
 286# the variable $(silent_cmd_cc_o_c) doesn't exist.
 287#
 288# A simple variant is to prefix commands with $(Q) - that's useful
 289# for commands that shall be hidden in non-verbose mode.
 290#
 291#       $(Q)ln $@ :<
 292#
 293# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 294# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 295
 296ifeq ($(KBUILD_VERBOSE),1)
 297  quiet =
 298  Q =
 299else
 300  quiet=quiet_
 301  Q = @
 302endif
 303
 304# If the user is running make -s (silent mode), suppress echoing of
 305# commands
 306
 307ifneq ($(findstring s,$(MAKEFLAGS)),)
 308  quiet=silent_
 309endif
 310
 311export quiet Q KBUILD_VERBOSE
 312
 313
 314# Look for make include files relative to root of kernel src
 315MAKEFLAGS += --include-dir=$(srctree)
 316
 317# We need some generic definitions (do not try to remake the file).
 318$(srctree)/scripts/Kbuild.include: ;
 319include $(srctree)/scripts/Kbuild.include
 320
 321# Make variables (CC, etc...)
 322
 323AS              = $(CROSS_COMPILE)as
 324LD              = $(CROSS_COMPILE)ld
 325CC              = $(CROSS_COMPILE)gcc
 326CPP             = $(CC) -E
 327AR              = $(CROSS_COMPILE)ar
 328NM              = $(CROSS_COMPILE)nm
 329STRIP           = $(CROSS_COMPILE)strip
 330OBJCOPY         = $(CROSS_COMPILE)objcopy
 331OBJDUMP         = $(CROSS_COMPILE)objdump
 332AWK             = awk
 333GENKSYMS        = scripts/genksyms/genksyms
 334INSTALLKERNEL  := installkernel
 335DEPMOD          = /sbin/depmod
 336KALLSYMS        = scripts/kallsyms
 337PERL            = perl
 338CHECK           = sparse
 339
 340CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 341                  -Wbitwise -Wno-return-void $(CF)
 342CFLAGS_MODULE   =
 343AFLAGS_MODULE   =
 344LDFLAGS_MODULE  =
 345CFLAGS_KERNEL   =
 346AFLAGS_KERNEL   =
 347CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 348
 349
 350# Use LINUXINCLUDE when you must reference the include/ directory.
 351# Needed to be compatible with the O= option
 352LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 353                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
 354                   -include include/generated/autoconf.h
 355
 356KBUILD_CPPFLAGS := -D__KERNEL__
 357
 358KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 359                   -fno-strict-aliasing -fno-common \
 360                   -Werror-implicit-function-declaration \
 361                   -Wno-format-security \
 362                   -fno-delete-null-pointer-checks
 363KBUILD_AFLAGS_KERNEL :=
 364KBUILD_CFLAGS_KERNEL :=
 365KBUILD_AFLAGS   := -D__ASSEMBLY__
 366KBUILD_AFLAGS_MODULE  := -DMODULE
 367KBUILD_CFLAGS_MODULE  := -DMODULE
 368KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 369
 370# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 371KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 372KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 373
 374export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 375export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 376export CPP AR NM STRIP OBJCOPY OBJDUMP
 377export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 378export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 379
 380export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 381export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 382export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 383export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 384export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 385
 386# When compiling out-of-tree modules, put MODVERDIR in the module
 387# tree rather than in the kernel tree. The kernel tree might
 388# even be read-only.
 389export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 390
 391# Files to ignore in find ... statements
 392
 393RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 394export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 395
 396# ===========================================================================
 397# Rules shared between *config targets and build targets
 398
 399# Basic helpers built in scripts/
 400PHONY += scripts_basic
 401scripts_basic:
 402        $(Q)$(MAKE) $(build)=scripts/basic
 403        $(Q)rm -f .tmp_quiet_recordmcount
 404
 405# To avoid any implicit rule to kick in, define an empty command.
 406scripts/basic/%: scripts_basic ;
 407
 408PHONY += outputmakefile
 409# outputmakefile generates a Makefile in the output directory, if using a
 410# separate output directory. This allows convenient use of make in the
 411# output directory.
 412outputmakefile:
 413ifneq ($(KBUILD_SRC),)
 414        $(Q)ln -fsn $(srctree) source
 415        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 416            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 417endif
 418
 419# To make sure we do not include .config for any of the *config targets
 420# catch them early, and hand them over to scripts/kconfig/Makefile
 421# It is allowed to specify more targets when calling make, including
 422# mixing *config targets and build targets.
 423# For example 'make oldconfig all'.
 424# Detect when mixed targets is specified, and make a second invocation
 425# of make so .config is not included in this case either (for *config).
 426
 427no-dot-config-targets := clean mrproper distclean \
 428                         cscope gtags TAGS tags help %docs check% coccicheck \
 429                         include/linux/version.h headers_% \
 430                         kernelversion %src-pkg
 431
 432config-targets := 0
 433mixed-targets  := 0
 434dot-config     := 1
 435
 436ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 437        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 438                dot-config := 0
 439        endif
 440endif
 441
 442ifeq ($(KBUILD_EXTMOD),)
 443        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 444                config-targets := 1
 445                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 446                        mixed-targets := 1
 447                endif
 448        endif
 449endif
 450
 451ifeq ($(mixed-targets),1)
 452# ===========================================================================
 453# We're called with mixed targets (*config and build targets).
 454# Handle them one by one.
 455
 456%:: FORCE
 457        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 458
 459else
 460ifeq ($(config-targets),1)
 461# ===========================================================================
 462# *config targets only - make sure prerequisites are updated, and descend
 463# in scripts/kconfig to make the *config target
 464
 465# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 466# KBUILD_DEFCONFIG may point out an alternative default configuration
 467# used for 'make defconfig'
 468include $(srctree)/arch/$(SRCARCH)/Makefile
 469export KBUILD_DEFCONFIG KBUILD_KCONFIG
 470
 471config: scripts_basic outputmakefile FORCE
 472        $(Q)mkdir -p include/linux include/config
 473        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 474
 475%config: scripts_basic outputmakefile FORCE
 476        $(Q)mkdir -p include/linux include/config
 477        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 478
 479else
 480# ===========================================================================
 481# Build targets only - this includes vmlinux, arch specific targets, clean
 482# targets and others. In general all targets except *config targets.
 483
 484ifeq ($(KBUILD_EXTMOD),)
 485# Additional helpers built in scripts/
 486# Carefully list dependencies so we do not try to build scripts twice
 487# in parallel
 488PHONY += scripts
 489scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 490        $(Q)$(MAKE) $(build)=$(@)
 491
 492# Objects we will link into vmlinux / subdirs we need to visit
 493init-y          := init/
 494drivers-y       := drivers/ sound/ firmware/
 495net-y           := net/
 496libs-y          := lib/
 497core-y          := usr/
 498endif # KBUILD_EXTMOD
 499
 500ifeq ($(dot-config),1)
 501# Read in config
 502-include include/config/auto.conf
 503
 504ifeq ($(KBUILD_EXTMOD),)
 505# Read in dependencies to all Kconfig* files, make sure to run
 506# oldconfig if changes are detected.
 507-include include/config/auto.conf.cmd
 508
 509# To avoid any implicit rule to kick in, define an empty command
 510$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 511
 512# If .config is newer than include/config/auto.conf, someone tinkered
 513# with it and forgot to run make oldconfig.
 514# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 515# we execute the config step to be sure to catch updated Kconfig files
 516include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 517        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 518else
 519# external modules needs include/generated/autoconf.h and include/config/auto.conf
 520# but do not care if they are up-to-date. Use auto.conf to trigger the test
 521PHONY += include/config/auto.conf
 522
 523include/config/auto.conf:
 524        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 525        echo;                                                           \
 526        echo "  ERROR: Kernel configuration is invalid.";               \
 527        echo "         include/generated/autoconf.h or $@ are missing.";\
 528        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 529        echo;                                                           \
 530        /bin/false)
 531
 532endif # KBUILD_EXTMOD
 533
 534else
 535# Dummy target needed, because used as prerequisite
 536include/config/auto.conf: ;
 537endif # $(dot-config)
 538
 539# The all: target is the default when no target is given on the
 540# command line.
 541# This allow a user to issue only 'make' to build a kernel including modules
 542# Defaults to vmlinux, but the arch makefile usually adds further targets
 543all: vmlinux
 544
 545ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 546KBUILD_CFLAGS   += -Os
 547else
 548KBUILD_CFLAGS   += -O2
 549endif
 550
 551include $(srctree)/arch/$(SRCARCH)/Makefile
 552
 553ifneq ($(CONFIG_FRAME_WARN),0)
 554KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 555endif
 556
 557# Force gcc to behave correct even for buggy distributions
 558ifndef CONFIG_CC_STACKPROTECTOR
 559KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 560endif
 561
 562ifdef CONFIG_FRAME_POINTER
 563KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 564else
 565# Some targets (ARM with Thumb2, for example), can't be built with frame
 566# pointers.  For those, we don't have FUNCTION_TRACER automatically
 567# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 568# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 569# -fomit-frame-pointer with FUNCTION_TRACER.
 570ifndef CONFIG_FUNCTION_TRACER
 571KBUILD_CFLAGS   += -fomit-frame-pointer
 572endif
 573endif
 574
 575ifdef CONFIG_DEBUG_INFO
 576KBUILD_CFLAGS   += -g
 577KBUILD_AFLAGS   += -gdwarf-2
 578endif
 579
 580ifdef CONFIG_DEBUG_INFO_REDUCED
 581KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly)
 582endif
 583
 584ifdef CONFIG_FUNCTION_TRACER
 585KBUILD_CFLAGS   += -pg
 586ifdef CONFIG_DYNAMIC_FTRACE
 587        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 588                BUILD_C_RECORDMCOUNT := y
 589                export BUILD_C_RECORDMCOUNT
 590        endif
 591endif
 592endif
 593
 594# We trigger additional mismatches with less inlining
 595ifdef CONFIG_DEBUG_SECTION_MISMATCH
 596KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 597endif
 598
 599# arch Makefile may override CC so keep this after arch Makefile is included
 600NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 601CHECKFLAGS     += $(NOSTDINC_FLAGS)
 602
 603# warn about C99 declaration after statement
 604KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 605
 606# disable pointer signed / unsigned warnings in gcc 4.0
 607KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 608
 609# disable invalid "can't wrap" optimizations for signed / pointers
 610KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 611
 612# conserve stack if available
 613KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 614
 615# check for 'asm goto'
 616ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 617        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 618endif
 619
 620# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 621# But warn user when we do so
 622warn-assign = \
 623$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 624
 625ifneq ($(KCPPFLAGS),)
 626        $(call warn-assign,CPPFLAGS)
 627        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 628endif
 629ifneq ($(KAFLAGS),)
 630        $(call warn-assign,AFLAGS)
 631        KBUILD_AFLAGS += $(KAFLAGS)
 632endif
 633ifneq ($(KCFLAGS),)
 634        $(call warn-assign,CFLAGS)
 635        KBUILD_CFLAGS += $(KCFLAGS)
 636endif
 637
 638# Use --build-id when available.
 639LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 640                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 641KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 642LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 643
 644ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 645LDFLAGS_vmlinux += $(call ld-option, -X,)
 646endif
 647
 648# Default kernel image to build when no specific target is given.
 649# KBUILD_IMAGE may be overruled on the command line or
 650# set in the environment
 651# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 652# this default value
 653export KBUILD_IMAGE ?= vmlinux
 654
 655#
 656# INSTALL_PATH specifies where to place the updated kernel and system map
 657# images. Default is /boot, but you can set it to other values
 658export  INSTALL_PATH ?= /boot
 659
 660#
 661# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 662# relocations required by build roots.  This is not defined in the
 663# makefile but the argument can be passed to make if needed.
 664#
 665
 666MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 667export MODLIB
 668
 669#
 670#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 671#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 672#  the default option --strip-debug will be used.  Otherwise,
 673#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 674
 675ifdef INSTALL_MOD_STRIP
 676ifeq ($(INSTALL_MOD_STRIP),1)
 677mod_strip_cmd = $(STRIP) --strip-debug
 678else
 679mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 680endif # INSTALL_MOD_STRIP=1
 681else
 682mod_strip_cmd = true
 683endif # INSTALL_MOD_STRIP
 684export mod_strip_cmd
 685
 686
 687ifeq ($(KBUILD_EXTMOD),)
 688core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 689
 690vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 691                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 692                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 693
 694vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 695                     $(init-n) $(init-) \
 696                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 697                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 698
 699init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 700core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 701drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 702net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 703libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 704libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 705libs-y          := $(libs-y1) $(libs-y2)
 706
 707# Build vmlinux
 708# ---------------------------------------------------------------------------
 709# vmlinux is built from the objects selected by $(vmlinux-init) and
 710# $(vmlinux-main). Most are built-in.o files from top-level directories
 711# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 712# Ordering when linking is important, and $(vmlinux-init) must be first.
 713#
 714# vmlinux
 715#   ^
 716#   |
 717#   +-< $(vmlinux-init)
 718#   |   +--< init/version.o + more
 719#   |
 720#   +--< $(vmlinux-main)
 721#   |    +--< driver/built-in.o mm/built-in.o + more
 722#   |
 723#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 724#
 725# vmlinux version (uname -v) cannot be updated during normal
 726# descending-into-subdirs phase since we do not yet know if we need to
 727# update vmlinux.
 728# Therefore this step is delayed until just before final link of vmlinux -
 729# except in the kallsyms case where it is done just before adding the
 730# symbols to the kernel.
 731#
 732# System.map is generated to document addresses of all kernel symbols
 733
 734vmlinux-init := $(head-y) $(init-y)
 735vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 736vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 737vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 738export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 739
 740# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 741# May be overridden by arch/$(ARCH)/Makefile
 742quiet_cmd_vmlinux__ ?= LD      $@
 743      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 744      -T $(vmlinux-lds) $(vmlinux-init)                          \
 745      --start-group $(vmlinux-main) --end-group                  \
 746      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 747
 748# Generate new vmlinux version
 749quiet_cmd_vmlinux_version = GEN     .version
 750      cmd_vmlinux_version = set -e;                     \
 751        if [ ! -r .version ]; then                      \
 752          rm -f .version;                               \
 753          echo 1 >.version;                             \
 754        else                                            \
 755          mv .version .old_version;                     \
 756          expr 0$$(cat .old_version) + 1 >.version;     \
 757        fi;                                             \
 758        $(MAKE) $(build)=init
 759
 760# Generate System.map
 761quiet_cmd_sysmap = SYSMAP
 762      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 763
 764# Link of vmlinux
 765# If CONFIG_KALLSYMS is set .version is already updated
 766# Generate System.map and verify that the content is consistent
 767# Use + in front of the vmlinux_version rule to silent warning with make -j2
 768# First command is ':' to allow us to use + in front of the rule
 769define rule_vmlinux__
 770        :
 771        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 772
 773        $(call cmd,vmlinux__)
 774        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 775
 776        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 777          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 778        $(cmd_sysmap) $@ System.map;                                         \
 779        if [ $$? -ne 0 ]; then                                               \
 780                rm -f $@;                                                    \
 781                /bin/false;                                                  \
 782        fi;
 783        $(verify_kallsyms)
 784endef
 785
 786
 787ifdef CONFIG_KALLSYMS
 788# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 789# It's a three stage process:
 790# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 791#   empty
 792#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 793#   the right size - vmlinux version (uname -v) is updated during this step
 794# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 795#   but due to the added section, some addresses have shifted.
 796#   From here, we generate a correct .tmp_kallsyms2.o
 797# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 798# o Verify that the System.map from vmlinux matches the map from
 799#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 800# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 801#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 802#   temporary bypass to allow the kernel to be built while the
 803#   maintainers work out what went wrong with kallsyms.
 804
 805ifdef CONFIG_KALLSYMS_EXTRA_PASS
 806last_kallsyms := 3
 807else
 808last_kallsyms := 2
 809endif
 810
 811kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 812
 813define verify_kallsyms
 814        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 815          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 816          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 817        $(Q)cmp -s System.map .tmp_System.map ||                             \
 818                (echo Inconsistent kallsyms data;                            \
 819                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 820                 rm .tmp_kallsyms* ; /bin/false )
 821endef
 822
 823# Update vmlinux version before link
 824# Use + in front of this rule to silent warning about make -j1
 825# First command is ':' to allow us to use + in front of this rule
 826cmd_ksym_ld = $(cmd_vmlinux__)
 827define rule_ksym_ld
 828        : 
 829        +$(call cmd,vmlinux_version)
 830        $(call cmd,vmlinux__)
 831        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 832endef
 833
 834# Generate .S file with all kernel symbols
 835quiet_cmd_kallsyms = KSYM    $@
 836      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 837                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 838
 839.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 840        $(call if_changed_dep,as_o_S)
 841
 842.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 843        $(call cmd,kallsyms)
 844
 845# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 846.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 847        $(call if_changed_rule,ksym_ld)
 848
 849.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 850        $(call if_changed,vmlinux__)
 851
 852.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 853        $(call if_changed,vmlinux__)
 854
 855# Needs to visit scripts/ before $(KALLSYMS) can be used.
 856$(KALLSYMS): scripts ;
 857
 858# Generate some data for debugging strange kallsyms problems
 859debug_kallsyms: .tmp_map$(last_kallsyms)
 860
 861.tmp_map%: .tmp_vmlinux% FORCE
 862        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 863
 864.tmp_map3: .tmp_map2
 865
 866.tmp_map2: .tmp_map1
 867
 868endif # ifdef CONFIG_KALLSYMS
 869
 870# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 871# relevant sections renamed as per the linker script.
 872quiet_cmd_vmlinux-modpost = LD      $@
 873      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 874         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 875         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 876define rule_vmlinux-modpost
 877        :
 878        +$(call cmd,vmlinux-modpost)
 879        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 880        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 881endef
 882
 883# vmlinux image - including updated kernel symbols
 884vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 885ifdef CONFIG_HEADERS_CHECK
 886        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 887endif
 888ifdef CONFIG_SAMPLES
 889        $(Q)$(MAKE) $(build)=samples
 890endif
 891ifdef CONFIG_BUILD_DOCSRC
 892        $(Q)$(MAKE) $(build)=Documentation
 893endif
 894        $(call vmlinux-modpost)
 895        $(call if_changed_rule,vmlinux__)
 896        $(Q)rm -f .old_version
 897
 898# build vmlinux.o first to catch section mismatch errors early
 899ifdef CONFIG_KALLSYMS
 900.tmp_vmlinux1: vmlinux.o
 901endif
 902
 903modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 904vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 905        $(call if_changed_rule,vmlinux-modpost)
 906
 907# The actual objects are generated when descending, 
 908# make sure no implicit rule kicks in
 909$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 910
 911# Handle descending into subdirectories listed in $(vmlinux-dirs)
 912# Preset locale variables to speed up the build process. Limit locale
 913# tweaks to this spot to avoid wrong language settings when running
 914# make menuconfig etc.
 915# Error messages still appears in the original language
 916
 917PHONY += $(vmlinux-dirs)
 918$(vmlinux-dirs): prepare scripts
 919        $(Q)$(MAKE) $(build)=$@
 920
 921# Store (new) KERNELRELASE string in include/config/kernel.release
 922include/config/kernel.release: include/config/auto.conf FORCE
 923        $(Q)rm -f $@
 924        $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 925
 926
 927# Things we need to do before we recursively start building the kernel
 928# or the modules are listed in "prepare".
 929# A multi level approach is used. prepareN is processed before prepareN-1.
 930# archprepare is used in arch Makefiles and when processed asm symlink,
 931# version.h and scripts_basic is processed / created.
 932
 933# Listed in dependency order
 934PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 935
 936# prepare3 is used to check if we are building in a separate output directory,
 937# and if so do:
 938# 1) Check that make has not been executed in the kernel src $(srctree)
 939prepare3: include/config/kernel.release
 940ifneq ($(KBUILD_SRC),)
 941        @$(kecho) '  Using $(srctree) as source for kernel'
 942        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 943                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 944                echo "  in the '$(srctree)' directory.";\
 945                /bin/false; \
 946        fi;
 947endif
 948
 949# prepare2 creates a makefile if using a separate output directory
 950prepare2: prepare3 outputmakefile
 951
 952prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 953                   include/config/auto.conf
 954        $(cmd_crmodverdir)
 955
 956archprepare: prepare1 scripts_basic
 957
 958prepare0: archprepare FORCE
 959        $(Q)$(MAKE) $(build)=.
 960        $(Q)$(MAKE) $(build)=. missing-syscalls
 961
 962# All the preparing..
 963prepare: prepare0
 964
 965# Generate some files
 966# ---------------------------------------------------------------------------
 967
 968# KERNELRELEASE can change from a few different places, meaning version.h
 969# needs to be updated, so this check is forced on all builds
 970
 971uts_len := 64
 972define filechk_utsrelease.h
 973        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 974          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 975          exit 1;                                                         \
 976        fi;                                                               \
 977        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 978endef
 979
 980define filechk_version.h
 981        (echo \#define LINUX_VERSION_CODE $(shell                             \
 982        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 983        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 984endef
 985
 986include/linux/version.h: $(srctree)/Makefile FORCE
 987        $(call filechk,version.h)
 988
 989include/generated/utsrelease.h: include/config/kernel.release FORCE
 990        $(call filechk,utsrelease.h)
 991
 992PHONY += headerdep
 993headerdep:
 994        $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
 995
 996# ---------------------------------------------------------------------------
 997
 998PHONY += depend dep
 999depend dep:
1000        @echo '*** Warning: make $@ is unnecessary now.'
1001
1002# ---------------------------------------------------------------------------
1003# Firmware install
1004INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1005export INSTALL_FW_PATH
1006
1007PHONY += firmware_install
1008firmware_install: FORCE
1009        @mkdir -p $(objtree)/firmware
1010        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1011
1012# ---------------------------------------------------------------------------
1013# Kernel headers
1014
1015#Default location for installed headers
1016export INSTALL_HDR_PATH = $(objtree)/usr
1017
1018hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1019
1020# If we do an all arch process set dst to asm-$(hdr-arch)
1021hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1022
1023PHONY += __headers
1024__headers: include/linux/version.h scripts_basic FORCE
1025        $(Q)$(MAKE) $(build)=scripts build_unifdef
1026
1027PHONY += headers_install_all
1028headers_install_all:
1029        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1030
1031PHONY += headers_install
1032headers_install: __headers
1033        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1034        $(error Headers not exportable for the $(SRCARCH) architecture))
1035        $(Q)$(MAKE) $(hdr-inst)=include
1036        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1037
1038PHONY += headers_check_all
1039headers_check_all: headers_install_all
1040        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1041
1042PHONY += headers_check
1043headers_check: headers_install
1044        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1045        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1046
1047# ---------------------------------------------------------------------------
1048# Modules
1049
1050ifdef CONFIG_MODULES
1051
1052# By default, build modules as well
1053
1054all: modules
1055
1056#       Build modules
1057#
1058#       A module can be listed more than once in obj-m resulting in
1059#       duplicate lines in modules.order files.  Those are removed
1060#       using awk while concatenating to the final file.
1061
1062PHONY += modules
1063modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1064        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1065        @$(kecho) '  Building modules, stage 2.';
1066        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1067        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1068
1069modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1070        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1071
1072%/modules.builtin: include/config/auto.conf
1073        $(Q)$(MAKE) $(modbuiltin)=$*
1074
1075
1076# Target to prepare building external modules
1077PHONY += modules_prepare
1078modules_prepare: prepare scripts
1079
1080# Target to install modules
1081PHONY += modules_install
1082modules_install: _modinst_ _modinst_post
1083
1084PHONY += _modinst_
1085_modinst_:
1086        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1087                echo "Warning: you may need to install module-init-tools"; \
1088                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1089                sleep 1; \
1090        fi
1091        @rm -rf $(MODLIB)/kernel
1092        @rm -f $(MODLIB)/source
1093        @mkdir -p $(MODLIB)/kernel
1094        @ln -s $(srctree) $(MODLIB)/source
1095        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1096                rm -f $(MODLIB)/build ; \
1097                ln -s $(objtree) $(MODLIB)/build ; \
1098        fi
1099        @cp -f $(objtree)/modules.order $(MODLIB)/
1100        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1101        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1102
1103# This depmod is only for convenience to give the initial
1104# boot a modules.dep even before / is mounted read-write.  However the
1105# boot script depmod is the master version.
1106PHONY += _modinst_post
1107_modinst_post: _modinst_
1108        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1109        $(call cmd,depmod)
1110
1111else # CONFIG_MODULES
1112
1113# Modules not configured
1114# ---------------------------------------------------------------------------
1115
1116modules modules_install: FORCE
1117        @echo
1118        @echo "The present kernel configuration has modules disabled."
1119        @echo "Type 'make config' and enable loadable module support."
1120        @echo "Then build a kernel with module support enabled."
1121        @echo
1122        @exit 1
1123
1124endif # CONFIG_MODULES
1125
1126###
1127# Cleaning is done on three levels.
1128# make clean     Delete most generated files
1129#                Leave enough to build external modules
1130# make mrproper  Delete the current configuration, and all generated files
1131# make distclean Remove editor backup files, patch leftover files and the like
1132
1133# Directories & files removed with 'make clean'
1134CLEAN_DIRS  += $(MODVERDIR)
1135CLEAN_FILES +=  vmlinux System.map \
1136                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1137
1138# Directories & files removed with 'make mrproper'
1139MRPROPER_DIRS  += include/config usr/include include/generated
1140MRPROPER_FILES += .config .config.old .version .old_version             \
1141                  include/linux/version.h                               \
1142                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1143
1144# clean - Delete most, but leave enough to build external modules
1145#
1146clean: rm-dirs  := $(CLEAN_DIRS)
1147clean: rm-files := $(CLEAN_FILES)
1148clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1149
1150PHONY += $(clean-dirs) clean archclean
1151$(clean-dirs):
1152        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1153
1154clean: archclean
1155
1156# mrproper - Delete all generated files, including .config
1157#
1158mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1159mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1160mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1161
1162PHONY += $(mrproper-dirs) mrproper archmrproper
1163$(mrproper-dirs):
1164        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1165
1166mrproper: clean archmrproper $(mrproper-dirs)
1167        $(call cmd,rmdirs)
1168        $(call cmd,rmfiles)
1169
1170# distclean
1171#
1172PHONY += distclean
1173
1174distclean: mrproper
1175        @find $(srctree) $(RCS_FIND_IGNORE) \
1176                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1177                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1178                -o -name '.*.rej' -o -size 0 \
1179                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1180                -type f -print | xargs rm -f
1181
1182
1183# Packaging of the kernel to various formats
1184# ---------------------------------------------------------------------------
1185# rpm target kept for backward compatibility
1186package-dir     := $(srctree)/scripts/package
1187
1188%src-pkg: FORCE
1189        $(Q)$(MAKE) $(build)=$(package-dir) $@
1190%pkg: include/config/kernel.release FORCE
1191        $(Q)$(MAKE) $(build)=$(package-dir) $@
1192rpm: include/config/kernel.release FORCE
1193        $(Q)$(MAKE) $(build)=$(package-dir) $@
1194
1195
1196# Brief documentation of the typical targets used
1197# ---------------------------------------------------------------------------
1198
1199boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1200boards := $(notdir $(boards))
1201board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1202board-dirs := $(sort $(notdir $(board-dirs:/=)))
1203
1204help:
1205        @echo  'Cleaning targets:'
1206        @echo  '  clean           - Remove most generated files but keep the config and'
1207        @echo  '                    enough build support to build external modules'
1208        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1209        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1210        @echo  ''
1211        @echo  'Configuration targets:'
1212        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1213        @echo  ''
1214        @echo  'Other generic targets:'
1215        @echo  '  all             - Build all targets marked with [*]'
1216        @echo  '* vmlinux         - Build the bare kernel'
1217        @echo  '* modules         - Build all modules'
1218        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1219        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1220        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1221        @echo  '  dir/            - Build all files in dir and below'
1222        @echo  '  dir/file.[oisS] - Build specified target only'
1223        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1224        @echo  '                    (requires a recent binutils and recent build (System.map))'
1225        @echo  '  dir/file.ko     - Build module including final link'
1226        @echo  '  modules_prepare - Set up for building external modules'
1227        @echo  '  tags/TAGS       - Generate tags file for editors'
1228        @echo  '  cscope          - Generate cscope index'
1229        @echo  '  gtags           - Generate GNU GLOBAL index'
1230        @echo  '  kernelrelease   - Output the release version string'
1231        @echo  '  kernelversion   - Output the version stored in Makefile'
1232        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1233         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1234         echo  ''
1235        @echo  'Static analysers'
1236        @echo  '  checkstack      - Generate a list of stack hogs'
1237        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1238        @echo  '  versioncheck    - Sanity check on version.h usage'
1239        @echo  '  includecheck    - Check for duplicate included header files'
1240        @echo  '  export_report   - List the usages of all exported symbols'
1241        @echo  '  headers_check   - Sanity check on exported headers'
1242        @echo  '  headerdep       - Detect inclusion cycles in headers'
1243        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1244        @echo  ''
1245        @echo  'Kernel packaging:'
1246        @$(MAKE) $(build)=$(package-dir) help
1247        @echo  ''
1248        @echo  'Documentation targets:'
1249        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1250        @echo  ''
1251        @echo  'Architecture specific targets ($(SRCARCH)):'
1252        @$(if $(archhelp),$(archhelp),\
1253                echo '  No architecture specific help defined for $(SRCARCH)')
1254        @echo  ''
1255        @$(if $(boards), \
1256                $(foreach b, $(boards), \
1257                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1258                echo '')
1259        @$(if $(board-dirs), \
1260                $(foreach b, $(board-dirs), \
1261                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1262                printf "  %-16s - Show all of the above\\n" help-boards; \
1263                echo '')
1264
1265        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1266        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1267        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1268        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1269        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1270        @echo  '  make W=1   [targets] Enable extra gcc checks'
1271        @echo  ''
1272        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1273        @echo  'For further info see the ./README file'
1274
1275
1276help-board-dirs := $(addprefix help-,$(board-dirs))
1277
1278help-boards: $(help-board-dirs)
1279
1280boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1281
1282$(help-board-dirs): help-%:
1283        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1284        @$(if $(boards-per-dir), \
1285                $(foreach b, $(boards-per-dir), \
1286                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1287                echo '')
1288
1289
1290# Documentation targets
1291# ---------------------------------------------------------------------------
1292%docs: scripts_basic FORCE
1293        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1294
1295else # KBUILD_EXTMOD
1296
1297###
1298# External module support.
1299# When building external modules the kernel used as basis is considered
1300# read-only, and no consistency checks are made and the make
1301# system is not used on the basis kernel. If updates are required
1302# in the basis kernel ordinary make commands (without M=...) must
1303# be used.
1304#
1305# The following are the only valid targets when building external
1306# modules.
1307# make M=dir clean     Delete all automatically generated files
1308# make M=dir modules   Make all modules in specified dir
1309# make M=dir           Same as 'make M=dir modules'
1310# make M=dir modules_install
1311#                      Install the modules built in the module directory
1312#                      Assumes install directory is already created
1313
1314# We are always building modules
1315KBUILD_MODULES := 1
1316PHONY += crmodverdir
1317crmodverdir:
1318        $(cmd_crmodverdir)
1319
1320PHONY += $(objtree)/Module.symvers
1321$(objtree)/Module.symvers:
1322        @test -e $(objtree)/Module.symvers || ( \
1323        echo; \
1324        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1325        echo "           is missing; modules will have no dependencies and modversions."; \
1326        echo )
1327
1328module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1329PHONY += $(module-dirs) modules
1330$(module-dirs): crmodverdir $(objtree)/Module.symvers
1331        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1332
1333modules: $(module-dirs)
1334        @$(kecho) '  Building modules, stage 2.';
1335        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1336
1337PHONY += modules_install
1338modules_install: _emodinst_ _emodinst_post
1339
1340install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1341PHONY += _emodinst_
1342_emodinst_:
1343        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1344        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1345
1346PHONY += _emodinst_post
1347_emodinst_post: _emodinst_
1348        $(call cmd,depmod)
1349
1350clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1351
1352PHONY += $(clean-dirs) clean
1353$(clean-dirs):
1354        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1355
1356clean:  rm-dirs := $(MODVERDIR)
1357clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1358
1359help:
1360        @echo  '  Building external modules.'
1361        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1362        @echo  ''
1363        @echo  '  modules         - default target, build the module(s)'
1364        @echo  '  modules_install - install the module'
1365        @echo  '  clean           - remove generated files in module directory only'
1366        @echo  ''
1367
1368# Dummies...
1369PHONY += prepare scripts
1370prepare: ;
1371scripts: ;
1372endif # KBUILD_EXTMOD
1373
1374clean: $(clean-dirs)
1375        $(call cmd,rmdirs)
1376        $(call cmd,rmfiles)
1377        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1378                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1379                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1380                -o -name '*.symtypes' -o -name 'modules.order' \
1381                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1382                -o -name '*.gcno' \) -type f -print | xargs rm -f
1383
1384# Generate tags for editors
1385# ---------------------------------------------------------------------------
1386quiet_cmd_tags = GEN     $@
1387      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1388
1389tags TAGS cscope gtags: FORCE
1390        $(call cmd,tags)
1391
1392# Scripts to check various things for consistency
1393# ---------------------------------------------------------------------------
1394
1395includecheck:
1396        find * $(RCS_FIND_IGNORE) \
1397                -name '*.[hcS]' -type f -print | sort \
1398                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1399
1400versioncheck:
1401        find * $(RCS_FIND_IGNORE) \
1402                -name '*.[hcS]' -type f -print | sort \
1403                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1404
1405coccicheck:
1406        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1407
1408namespacecheck:
1409        $(PERL) $(srctree)/scripts/namespace.pl
1410
1411export_report:
1412        $(PERL) $(srctree)/scripts/export_report.pl
1413
1414endif #ifeq ($(config-targets),1)
1415endif #ifeq ($(mixed-targets),1)
1416
1417PHONY += checkstack kernelrelease kernelversion
1418
1419# UML needs a little special treatment here.  It wants to use the host
1420# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1421# else wants $(ARCH), including people doing cross-builds, which means
1422# that $(SUBARCH) doesn't work here.
1423ifeq ($(ARCH), um)
1424CHECKSTACK_ARCH := $(SUBARCH)
1425else
1426CHECKSTACK_ARCH := $(ARCH)
1427endif
1428checkstack:
1429        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1430        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1431
1432kernelrelease:
1433        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1434
1435kernelversion:
1436        @echo $(KERNELVERSION)
1437
1438# Single targets
1439# ---------------------------------------------------------------------------
1440# Single targets are compatible with:
1441# - build with mixed source and output
1442# - build with separate output dir 'make O=...'
1443# - external modules
1444#
1445#  target-dir => where to store outputfile
1446#  build-dir  => directory in kernel source tree to use
1447
1448ifeq ($(KBUILD_EXTMOD),)
1449        build-dir  = $(patsubst %/,%,$(dir $@))
1450        target-dir = $(dir $@)
1451else
1452        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1453        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1454        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1455endif
1456
1457%.s: %.c prepare scripts FORCE
1458        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1459%.i: %.c prepare scripts FORCE
1460        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461%.o: %.c prepare scripts FORCE
1462        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463%.lst: %.c prepare scripts FORCE
1464        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1465%.s: %.S prepare scripts FORCE
1466        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1467%.o: %.S prepare scripts FORCE
1468        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1469%.symtypes: %.c prepare scripts FORCE
1470        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1471
1472# Modules
1473/: prepare scripts FORCE
1474        $(cmd_crmodverdir)
1475        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1476        $(build)=$(build-dir)
1477%/: prepare scripts FORCE
1478        $(cmd_crmodverdir)
1479        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1480        $(build)=$(build-dir)
1481%.ko: prepare scripts FORCE
1482        $(cmd_crmodverdir)
1483        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1484        $(build)=$(build-dir) $(@:.ko=.o)
1485        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1486
1487# FIXME Should go into a make.lib or something 
1488# ===========================================================================
1489
1490quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1491      cmd_rmdirs = rm -rf $(rm-dirs)
1492
1493quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1494      cmd_rmfiles = rm -f $(rm-files)
1495
1496# Run depmod only if we have System.map and depmod is executable
1497quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1498      cmd_depmod = \
1499        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1500                $(DEPMOD) -ae -F System.map                                     \
1501                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1502                $(KERNELRELEASE);                                               \
1503        fi
1504
1505# Create temporary dir for module support files
1506# clean it up only when building all modules
1507cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1508                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1509
1510a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1511          $(KBUILD_AFLAGS_KERNEL)                              \
1512          $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1513          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1514
1515quiet_cmd_as_o_S = AS      $@
1516cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1517
1518# read all saved command lines
1519
1520targets := $(wildcard $(sort $(targets)))
1521cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1522
1523ifneq ($(cmd_files),)
1524  $(cmd_files): ;       # Do not try to update included dependency files
1525  include $(cmd_files)
1526endif
1527
1528# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1529# Usage:
1530# $(Q)$(MAKE) $(clean)=dir
1531clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1532
1533endif   # skip-makefile
1534
1535PHONY += FORCE
1536FORCE:
1537
1538# Declare the contents of the .PHONY variable as phony.  We keep that
1539# information in a variable so we can use it in if_changed and friends.
1540.PHONY: $(PHONY)
1541