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   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 30
   4EXTRAVERSION =
   5NAME = Man-Eating Seals of Antiquity
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# We are using a recursive build, so we need to do a little thinking
  20# to get the ordering right.
  21#
  22# Most importantly: sub-Makefiles should only ever modify files in
  23# their own directory. If in some directory we have a dependency on
  24# a file in another dir (which doesn't happen often, but it's often
  25# unavoidable when linking the built-in.o targets which finally
  26# turn into vmlinux), we will call a sub make in that other dir, and
  27# after that we are sure that everything which is in that other dir
  28# is now up to date.
  29#
  30# The only cases where we need to modify files which have global
  31# effects are thus separated out and done before the recursive
  32# descending is started. They are now explicitly listed as the
  33# prepare rule.
  34
  35# To put more focus on warnings, be less verbose as default
  36# Use 'make V=1' to see the full commands
  37
  38ifdef V
  39  ifeq ("$(origin V)", "command line")
  40    KBUILD_VERBOSE = $(V)
  41  endif
  42endif
  43ifndef KBUILD_VERBOSE
  44  KBUILD_VERBOSE = 0
  45endif
  46
  47# Call a source code checker (by default, "sparse") as part of the
  48# C compilation.
  49#
  50# Use 'make C=1' to enable checking of only re-compiled files.
  51# Use 'make C=2' to enable checking of *all* source files, regardless
  52# of whether they are re-compiled or not.
  53#
  54# See the file "Documentation/sparse.txt" for more details, including
  55# where to get the "sparse" utility.
  56
  57ifdef C
  58  ifeq ("$(origin C)", "command line")
  59    KBUILD_CHECKSRC = $(C)
  60  endif
  61endif
  62ifndef KBUILD_CHECKSRC
  63  KBUILD_CHECKSRC = 0
  64endif
  65
  66# Use make M=dir to specify directory of external module to build
  67# Old syntax make ... SUBDIRS=$PWD is still supported
  68# Setting the environment variable KBUILD_EXTMOD take precedence
  69ifdef SUBDIRS
  70  KBUILD_EXTMOD ?= $(SUBDIRS)
  71endif
  72ifdef M
  73  ifeq ("$(origin M)", "command line")
  74    KBUILD_EXTMOD := $(M)
  75  endif
  76endif
  77
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(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?
 101ifdef O
 102  ifeq ("$(origin O)", "command line")
 103    KBUILD_OUTPUT := $(O)
 104  endif
 105endif
 106
 107# That's our default target when none is given on the command line
 108PHONY := _all
 109_all:
 110
 111# Cancel implicit rules on top Makefile
 112$(CURDIR)/Makefile Makefile: ;
 113
 114ifneq ($(KBUILD_OUTPUT),)
 115# Invoke a second make in the output directory, passing relevant variables
 116# check that the output directory actually exists
 117saved-output := $(KBUILD_OUTPUT)
 118KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119$(if $(KBUILD_OUTPUT),, \
 120     $(error output directory "$(saved-output)" does not exist))
 121
 122PHONY += $(MAKECMDGOALS) sub-make
 123
 124$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125        $(Q)@:
 126
 127sub-make: FORCE
 128        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129        KBUILD_SRC=$(CURDIR) \
 130        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131        $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133# Leave processing to above invocation of make
 134skip-makefile := 1
 135endif # ifneq ($(KBUILD_OUTPUT),)
 136endif # ifeq ($(KBUILD_SRC),)
 137
 138# We process the rest of the Makefile if this is the final invocation of make
 139ifeq ($(skip-makefile),)
 140
 141# If building an external module we do not care about the all: rule
 142# but instead _all depend on modules
 143PHONY += all
 144ifeq ($(KBUILD_EXTMOD),)
 145_all: all
 146else
 147_all: modules
 148endif
 149
 150srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151TOPDIR          := $(srctree)
 152# FIXME - TOPDIR is obsolete, use srctree/objtree
 153objtree         := $(CURDIR)
 154src             := $(srctree)
 155obj             := $(objtree)
 156
 157VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159export srctree objtree VPATH TOPDIR
 160
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 167
 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# Default value for CROSS_COMPILE is not to prefix executables
 191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192export KBUILD_BUILDHOST := $(SUBARCH)
 193ARCH            ?= $(SUBARCH)
 194CROSS_COMPILE   ?=
 195
 196# Architecture as present in compile.h
 197UTS_MACHINE     := $(ARCH)
 198SRCARCH         := $(ARCH)
 199
 200# Additional ARCH settings for x86
 201ifeq ($(ARCH),i386)
 202        SRCARCH := x86
 203endif
 204ifeq ($(ARCH),x86_64)
 205        SRCARCH := x86
 206endif
 207
 208# Additional ARCH settings for sparc
 209ifeq ($(ARCH),sparc64)
 210       SRCARCH := sparc
 211endif
 212
 213# Additional ARCH settings for sh
 214ifeq ($(ARCH),sh64)
 215       SRCARCH := sh
 216endif
 217
 218# Where to locate arch specific headers
 219hdr-arch  := $(SRCARCH)
 220
 221ifeq ($(ARCH),m68knommu)
 222       hdr-arch  := m68k
 223endif
 224
 225KCONFIG_CONFIG  ?= .config
 226
 227# SHELL used by kbuild
 228CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 229          else if [ -x /bin/bash ]; then echo /bin/bash; \
 230          else echo sh; fi ; fi)
 231
 232HOSTCC       = gcc
 233HOSTCXX      = g++
 234HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 235HOSTCXXFLAGS = -O2
 236
 237# Decide whether to build built-in, modular, or both.
 238# Normally, just do built-in.
 239
 240KBUILD_MODULES :=
 241KBUILD_BUILTIN := 1
 242
 243#       If we have only "make modules", don't compile built-in objects.
 244#       When we're building modules with modversions, we need to consider
 245#       the built-in objects during the descend as well, in order to
 246#       make sure the checksums are up to date before we record them.
 247
 248ifeq ($(MAKECMDGOALS),modules)
 249  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 250endif
 251
 252#       If we have "make <whatever> modules", compile modules
 253#       in addition to whatever we do anyway.
 254#       Just "make" or "make all" shall build modules as well
 255
 256ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 257  KBUILD_MODULES := 1
 258endif
 259
 260ifeq ($(MAKECMDGOALS),)
 261  KBUILD_MODULES := 1
 262endif
 263
 264export KBUILD_MODULES KBUILD_BUILTIN
 265export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 266
 267# Beautify output
 268# ---------------------------------------------------------------------------
 269#
 270# Normally, we echo the whole command before executing it. By making
 271# that echo $($(quiet)$(cmd)), we now have the possibility to set
 272# $(quiet) to choose other forms of output instead, e.g.
 273#
 274#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 275#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 276#
 277# If $(quiet) is empty, the whole command will be printed.
 278# If it is set to "quiet_", only the short version will be printed. 
 279# If it is set to "silent_", nothing will be printed at all, since
 280# the variable $(silent_cmd_cc_o_c) doesn't exist.
 281#
 282# A simple variant is to prefix commands with $(Q) - that's useful
 283# for commands that shall be hidden in non-verbose mode.
 284#
 285#       $(Q)ln $@ :<
 286#
 287# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 288# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 289
 290ifeq ($(KBUILD_VERBOSE),1)
 291  quiet =
 292  Q =
 293else
 294  quiet=quiet_
 295  Q = @
 296endif
 297
 298# If the user is running make -s (silent mode), suppress echoing of
 299# commands
 300
 301ifneq ($(findstring s,$(MAKEFLAGS)),)
 302  quiet=silent_
 303endif
 304
 305export quiet Q KBUILD_VERBOSE
 306
 307
 308# Look for make include files relative to root of kernel src
 309MAKEFLAGS += --include-dir=$(srctree)
 310
 311# We need some generic definitions (do not try to remake the file).
 312$(srctree)/scripts/Kbuild.include: ;
 313include $(srctree)/scripts/Kbuild.include
 314
 315# Make variables (CC, etc...)
 316
 317AS              = $(CROSS_COMPILE)as
 318LD              = $(CROSS_COMPILE)ld
 319CC              = $(CROSS_COMPILE)gcc
 320CPP             = $(CC) -E
 321AR              = $(CROSS_COMPILE)ar
 322NM              = $(CROSS_COMPILE)nm
 323STRIP           = $(CROSS_COMPILE)strip
 324OBJCOPY         = $(CROSS_COMPILE)objcopy
 325OBJDUMP         = $(CROSS_COMPILE)objdump
 326AWK             = awk
 327GENKSYMS        = scripts/genksyms/genksyms
 328DEPMOD          = /sbin/depmod
 329KALLSYMS        = scripts/kallsyms
 330PERL            = perl
 331CHECK           = sparse
 332
 333CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 334                  -Wbitwise -Wno-return-void $(CF)
 335MODFLAGS        = -DMODULE
 336CFLAGS_MODULE   = $(MODFLAGS)
 337AFLAGS_MODULE   = $(MODFLAGS)
 338LDFLAGS_MODULE  =
 339CFLAGS_KERNEL   =
 340AFLAGS_KERNEL   =
 341
 342
 343# Use LINUXINCLUDE when you must reference the include/ directory.
 344# Needed to be compatible with the O= option
 345LINUXINCLUDE    := -Iinclude \
 346                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 347                   -I$(srctree)/arch/$(hdr-arch)/include               \
 348                   -include include/linux/autoconf.h
 349
 350KBUILD_CPPFLAGS := -D__KERNEL__
 351
 352KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 353                   -fno-strict-aliasing -fno-common \
 354                   -Werror-implicit-function-declaration
 355KBUILD_AFLAGS   := -D__ASSEMBLY__
 356
 357# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 358KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 359KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 360
 361export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 362export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 363export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 364export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 365
 366export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 367export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 368export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 369
 370# When compiling out-of-tree modules, put MODVERDIR in the module
 371# tree rather than in the kernel tree. The kernel tree might
 372# even be read-only.
 373export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 374
 375# Files to ignore in find ... statements
 376
 377RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 378export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 379
 380# ===========================================================================
 381# Rules shared between *config targets and build targets
 382
 383# Basic helpers built in scripts/
 384PHONY += scripts_basic
 385scripts_basic:
 386        $(Q)$(MAKE) $(build)=scripts/basic
 387
 388# To avoid any implicit rule to kick in, define an empty command.
 389scripts/basic/%: scripts_basic ;
 390
 391PHONY += outputmakefile
 392# outputmakefile generates a Makefile in the output directory, if using a
 393# separate output directory. This allows convenient use of make in the
 394# output directory.
 395outputmakefile:
 396ifneq ($(KBUILD_SRC),)
 397        $(Q)ln -fsn $(srctree) source
 398        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 399            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 400endif
 401
 402# To make sure we do not include .config for any of the *config targets
 403# catch them early, and hand them over to scripts/kconfig/Makefile
 404# It is allowed to specify more targets when calling make, including
 405# mixing *config targets and build targets.
 406# For example 'make oldconfig all'.
 407# Detect when mixed targets is specified, and make a second invocation
 408# of make so .config is not included in this case either (for *config).
 409
 410no-dot-config-targets := clean mrproper distclean \
 411                         cscope TAGS tags help %docs check% \
 412                         include/linux/version.h headers_% \
 413                         kernelrelease kernelversion
 414
 415config-targets := 0
 416mixed-targets  := 0
 417dot-config     := 1
 418
 419ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 420        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 421                dot-config := 0
 422        endif
 423endif
 424
 425ifeq ($(KBUILD_EXTMOD),)
 426        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 427                config-targets := 1
 428                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 429                        mixed-targets := 1
 430                endif
 431        endif
 432endif
 433
 434ifeq ($(mixed-targets),1)
 435# ===========================================================================
 436# We're called with mixed targets (*config and build targets).
 437# Handle them one by one.
 438
 439%:: FORCE
 440        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 441
 442else
 443ifeq ($(config-targets),1)
 444# ===========================================================================
 445# *config targets only - make sure prerequisites are updated, and descend
 446# in scripts/kconfig to make the *config target
 447
 448# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 449# KBUILD_DEFCONFIG may point out an alternative default configuration
 450# used for 'make defconfig'
 451include $(srctree)/arch/$(SRCARCH)/Makefile
 452export KBUILD_DEFCONFIG KBUILD_KCONFIG
 453
 454config: scripts_basic outputmakefile FORCE
 455        $(Q)mkdir -p include/linux include/config
 456        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 457
 458%config: scripts_basic outputmakefile FORCE
 459        $(Q)mkdir -p include/linux include/config
 460        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 461
 462else
 463# ===========================================================================
 464# Build targets only - this includes vmlinux, arch specific targets, clean
 465# targets and others. In general all targets except *config targets.
 466
 467ifeq ($(KBUILD_EXTMOD),)
 468# Additional helpers built in scripts/
 469# Carefully list dependencies so we do not try to build scripts twice
 470# in parallel
 471PHONY += scripts
 472scripts: scripts_basic include/config/auto.conf
 473        $(Q)$(MAKE) $(build)=$(@)
 474
 475# Objects we will link into vmlinux / subdirs we need to visit
 476init-y          := init/
 477drivers-y       := drivers/ sound/ firmware/
 478net-y           := net/
 479libs-y          := lib/
 480core-y          := usr/
 481endif # KBUILD_EXTMOD
 482
 483ifeq ($(dot-config),1)
 484# Read in config
 485-include include/config/auto.conf
 486
 487ifeq ($(KBUILD_EXTMOD),)
 488# Read in dependencies to all Kconfig* files, make sure to run
 489# oldconfig if changes are detected.
 490-include include/config/auto.conf.cmd
 491
 492# To avoid any implicit rule to kick in, define an empty command
 493$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 494
 495# If .config is newer than include/config/auto.conf, someone tinkered
 496# with it and forgot to run make oldconfig.
 497# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 498# we execute the config step to be sure to catch updated Kconfig files
 499include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 500        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 501else
 502# external modules needs include/linux/autoconf.h and include/config/auto.conf
 503# but do not care if they are up-to-date. Use auto.conf to trigger the test
 504PHONY += include/config/auto.conf
 505
 506include/config/auto.conf:
 507        $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 508        echo;                                                           \
 509        echo "  ERROR: Kernel configuration is invalid.";               \
 510        echo "         include/linux/autoconf.h or $@ are missing.";    \
 511        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 512        echo;                                                           \
 513        /bin/false)
 514
 515endif # KBUILD_EXTMOD
 516
 517else
 518# Dummy target needed, because used as prerequisite
 519include/config/auto.conf: ;
 520endif # $(dot-config)
 521
 522# The all: target is the default when no target is given on the
 523# command line.
 524# This allow a user to issue only 'make' to build a kernel including modules
 525# Defaults vmlinux but it is usually overridden in the arch makefile
 526all: vmlinux
 527
 528ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 529KBUILD_CFLAGS   += -Os
 530else
 531KBUILD_CFLAGS   += -O2
 532endif
 533
 534include $(srctree)/arch/$(SRCARCH)/Makefile
 535
 536ifneq ($(CONFIG_FRAME_WARN),0)
 537KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 538endif
 539
 540# Force gcc to behave correct even for buggy distributions
 541ifndef CONFIG_CC_STACKPROTECTOR
 542KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 543endif
 544
 545ifdef CONFIG_FRAME_POINTER
 546KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 547else
 548KBUILD_CFLAGS   += -fomit-frame-pointer
 549endif
 550
 551ifdef CONFIG_DEBUG_INFO
 552KBUILD_CFLAGS   += -g
 553KBUILD_AFLAGS   += -gdwarf-2
 554endif
 555
 556ifdef CONFIG_FUNCTION_TRACER
 557KBUILD_CFLAGS   += -pg
 558endif
 559
 560# We trigger additional mismatches with less inlining
 561ifdef CONFIG_DEBUG_SECTION_MISMATCH
 562KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 563endif
 564
 565# arch Makefile may override CC so keep this after arch Makefile is included
 566NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 567CHECKFLAGS     += $(NOSTDINC_FLAGS)
 568
 569# warn about C99 declaration after statement
 570KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 571
 572# disable pointer signed / unsigned warnings in gcc 4.0
 573KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 574
 575# disable invalid "can't wrap" optimizations for signed / pointers
 576KBUILD_CFLAGS   += $(call cc-option,-fwrapv)
 577
 578# revert to pre-gcc-4.4 behaviour of .eh_frame
 579KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 580
 581# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 582# But warn user when we do so
 583warn-assign = \
 584$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 585
 586ifneq ($(KCPPFLAGS),)
 587        $(call warn-assign,CPPFLAGS)
 588        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 589endif
 590ifneq ($(KAFLAGS),)
 591        $(call warn-assign,AFLAGS)
 592        KBUILD_AFLAGS += $(KAFLAGS)
 593endif
 594ifneq ($(KCFLAGS),)
 595        $(call warn-assign,CFLAGS)
 596        KBUILD_CFLAGS += $(KCFLAGS)
 597endif
 598
 599# Use --build-id when available.
 600LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 601                              $(call ld-option, -Wl$(comma)--build-id,))
 602LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 603LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 604
 605ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 606LDFLAGS_vmlinux += -X
 607endif
 608
 609# Default kernel image to build when no specific target is given.
 610# KBUILD_IMAGE may be overruled on the command line or
 611# set in the environment
 612# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 613# this default value
 614export KBUILD_IMAGE ?= vmlinux
 615
 616#
 617# INSTALL_PATH specifies where to place the updated kernel and system map
 618# images. Default is /boot, but you can set it to other values
 619export  INSTALL_PATH ?= /boot
 620
 621#
 622# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 623# relocations required by build roots.  This is not defined in the
 624# makefile but the argument can be passed to make if needed.
 625#
 626
 627MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 628export MODLIB
 629
 630#
 631#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 632#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 633#  the default option --strip-debug will be used.  Otherwise,
 634#  INSTALL_MOD_STRIP will used as the options to the strip command.
 635
 636ifdef INSTALL_MOD_STRIP
 637ifeq ($(INSTALL_MOD_STRIP),1)
 638mod_strip_cmd = $(STRIP) --strip-debug
 639else
 640mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 641endif # INSTALL_MOD_STRIP=1
 642else
 643mod_strip_cmd = true
 644endif # INSTALL_MOD_STRIP
 645export mod_strip_cmd
 646
 647
 648ifeq ($(KBUILD_EXTMOD),)
 649core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 650
 651vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 652                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 653                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 654
 655vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 656                     $(init-n) $(init-) \
 657                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 658                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 659
 660init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 661core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 662drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 663net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 664libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 665libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 666libs-y          := $(libs-y1) $(libs-y2)
 667
 668# Build vmlinux
 669# ---------------------------------------------------------------------------
 670# vmlinux is built from the objects selected by $(vmlinux-init) and
 671# $(vmlinux-main). Most are built-in.o files from top-level directories
 672# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 673# Ordering when linking is important, and $(vmlinux-init) must be first.
 674#
 675# vmlinux
 676#   ^
 677#   |
 678#   +-< $(vmlinux-init)
 679#   |   +--< init/version.o + more
 680#   |
 681#   +--< $(vmlinux-main)
 682#   |    +--< driver/built-in.o mm/built-in.o + more
 683#   |
 684#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 685#
 686# vmlinux version (uname -v) cannot be updated during normal
 687# descending-into-subdirs phase since we do not yet know if we need to
 688# update vmlinux.
 689# Therefore this step is delayed until just before final link of vmlinux -
 690# except in the kallsyms case where it is done just before adding the
 691# symbols to the kernel.
 692#
 693# System.map is generated to document addresses of all kernel symbols
 694
 695vmlinux-init := $(head-y) $(init-y)
 696vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 697vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 698vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 699export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 700
 701# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 702# May be overridden by arch/$(ARCH)/Makefile
 703quiet_cmd_vmlinux__ ?= LD      $@
 704      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 705      -T $(vmlinux-lds) $(vmlinux-init)                          \
 706      --start-group $(vmlinux-main) --end-group                  \
 707      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 708
 709# Generate new vmlinux version
 710quiet_cmd_vmlinux_version = GEN     .version
 711      cmd_vmlinux_version = set -e;                     \
 712        if [ ! -r .version ]; then                      \
 713          rm -f .version;                               \
 714          echo 1 >.version;                             \
 715        else                                            \
 716          mv .version .old_version;                     \
 717          expr 0$$(cat .old_version) + 1 >.version;     \
 718        fi;                                             \
 719        $(MAKE) $(build)=init
 720
 721# Generate System.map
 722quiet_cmd_sysmap = SYSMAP
 723      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 724
 725# Link of vmlinux
 726# If CONFIG_KALLSYMS is set .version is already updated
 727# Generate System.map and verify that the content is consistent
 728# Use + in front of the vmlinux_version rule to silent warning with make -j2
 729# First command is ':' to allow us to use + in front of the rule
 730define rule_vmlinux__
 731        :
 732        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 733
 734        $(call cmd,vmlinux__)
 735        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 736
 737        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 738          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 739        $(cmd_sysmap) $@ System.map;                                         \
 740        if [ $$? -ne 0 ]; then                                               \
 741                rm -f $@;                                                    \
 742                /bin/false;                                                  \
 743        fi;
 744        $(verify_kallsyms)
 745endef
 746
 747
 748ifdef CONFIG_KALLSYMS
 749# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 750# It's a three stage process:
 751# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 752#   empty
 753#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 754#   the right size - vmlinux version (uname -v) is updated during this step
 755# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 756#   but due to the added section, some addresses have shifted.
 757#   From here, we generate a correct .tmp_kallsyms2.o
 758# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 759# o Verify that the System.map from vmlinux matches the map from
 760#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 761# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 762#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 763#   temporary bypass to allow the kernel to be built while the
 764#   maintainers work out what went wrong with kallsyms.
 765
 766ifdef CONFIG_KALLSYMS_EXTRA_PASS
 767last_kallsyms := 3
 768else
 769last_kallsyms := 2
 770endif
 771
 772kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 773
 774define verify_kallsyms
 775        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 776          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 777          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 778        $(Q)cmp -s System.map .tmp_System.map ||                             \
 779                (echo Inconsistent kallsyms data;                            \
 780                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 781                 rm .tmp_kallsyms* ; /bin/false )
 782endef
 783
 784# Update vmlinux version before link
 785# Use + in front of this rule to silent warning about make -j1
 786# First command is ':' to allow us to use + in front of this rule
 787cmd_ksym_ld = $(cmd_vmlinux__)
 788define rule_ksym_ld
 789        : 
 790        +$(call cmd,vmlinux_version)
 791        $(call cmd,vmlinux__)
 792        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 793endef
 794
 795# Generate .S file with all kernel symbols
 796quiet_cmd_kallsyms = KSYM    $@
 797      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 798                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 799
 800.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 801        $(call if_changed_dep,as_o_S)
 802
 803.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 804        $(call cmd,kallsyms)
 805
 806# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 807.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 808        $(call if_changed_rule,ksym_ld)
 809
 810.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 811        $(call if_changed,vmlinux__)
 812
 813.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 814        $(call if_changed,vmlinux__)
 815
 816# Needs to visit scripts/ before $(KALLSYMS) can be used.
 817$(KALLSYMS): scripts ;
 818
 819# Generate some data for debugging strange kallsyms problems
 820debug_kallsyms: .tmp_map$(last_kallsyms)
 821
 822.tmp_map%: .tmp_vmlinux% FORCE
 823        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 824
 825.tmp_map3: .tmp_map2
 826
 827.tmp_map2: .tmp_map1
 828
 829endif # ifdef CONFIG_KALLSYMS
 830
 831# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 832# relevant sections renamed as per the linker script.
 833quiet_cmd_vmlinux-modpost = LD      $@
 834      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 835         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 836         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 837define rule_vmlinux-modpost
 838        :
 839        +$(call cmd,vmlinux-modpost)
 840        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 841        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 842endef
 843
 844# vmlinux image - including updated kernel symbols
 845vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 846ifdef CONFIG_HEADERS_CHECK
 847        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 848endif
 849ifdef CONFIG_SAMPLES
 850        $(Q)$(MAKE) $(build)=samples
 851endif
 852ifdef CONFIG_BUILD_DOCSRC
 853        $(Q)$(MAKE) $(build)=Documentation
 854endif
 855        $(call vmlinux-modpost)
 856        $(call if_changed_rule,vmlinux__)
 857        $(Q)rm -f .old_version
 858
 859# build vmlinux.o first to catch section mismatch errors early
 860ifdef CONFIG_KALLSYMS
 861.tmp_vmlinux1: vmlinux.o
 862endif
 863
 864modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 865vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 866        $(call if_changed_rule,vmlinux-modpost)
 867
 868# The actual objects are generated when descending, 
 869# make sure no implicit rule kicks in
 870$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 871
 872# Handle descending into subdirectories listed in $(vmlinux-dirs)
 873# Preset locale variables to speed up the build process. Limit locale
 874# tweaks to this spot to avoid wrong language settings when running
 875# make menuconfig etc.
 876# Error messages still appears in the original language
 877
 878PHONY += $(vmlinux-dirs)
 879$(vmlinux-dirs): prepare scripts
 880        $(Q)$(MAKE) $(build)=$@
 881
 882# Build the kernel release string
 883#
 884# The KERNELRELEASE value built here is stored in the file
 885# include/config/kernel.release, and is used when executing several
 886# make targets, such as "make install" or "make modules_install."
 887#
 888# The eventual kernel release string consists of the following fields,
 889# shown in a hierarchical format to show how smaller parts are concatenated
 890# to form the larger and final value, with values coming from places like
 891# the Makefile, kernel config options, make command line options and/or
 892# SCM tag information.
 893#
 894#       $(KERNELVERSION)
 895#         $(VERSION)                    eg, 2
 896#         $(PATCHLEVEL)                 eg, 6
 897#         $(SUBLEVEL)                   eg, 18
 898#         $(EXTRAVERSION)               eg, -rc6
 899#       $(localver-full)
 900#         $(localver)
 901#           localversion*               (files without backups, containing '~')
 902#           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 903#         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 904#           ./scripts/setlocalversion   (SCM tag, if one exists)
 905#           $(LOCALVERSION)             (from make command line if provided)
 906#
 907#  Note how the final $(localver-auto) string is included *only* if the
 908# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 909# moment, only git is supported but other SCMs can edit the script
 910# scripts/setlocalversion and add the appropriate checks as needed.
 911
 912pattern = ".*/localversion[^~]*"
 913string  = $(shell cat /dev/null \
 914           `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 915
 916localver = $(subst $(space),, $(string) \
 917                              $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 918
 919# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 920# and if the SCM is know a tag from the SCM is appended.
 921# The appended tag is determined by the SCM used.
 922#
 923# .scmversion is used when generating rpm packages so we do not loose
 924# the version information from the SCM when we do the build of the kernel
 925# from the copied source
 926ifdef CONFIG_LOCALVERSION_AUTO
 927
 928ifeq ($(wildcard .scmversion),)
 929        _localver-auto = $(shell $(CONFIG_SHELL) \
 930                         $(srctree)/scripts/setlocalversion $(srctree))
 931else
 932        _localver-auto = $(shell cat .scmversion 2> /dev/null)
 933endif
 934
 935        localver-auto  = $(LOCALVERSION)$(_localver-auto)
 936endif
 937
 938localver-full = $(localver)$(localver-auto)
 939
 940# Store (new) KERNELRELASE string in include/config/kernel.release
 941kernelrelease = $(KERNELVERSION)$(localver-full)
 942include/config/kernel.release: include/config/auto.conf FORCE
 943        $(Q)rm -f $@
 944        $(Q)echo $(kernelrelease) > $@
 945
 946
 947# Things we need to do before we recursively start building the kernel
 948# or the modules are listed in "prepare".
 949# A multi level approach is used. prepareN is processed before prepareN-1.
 950# archprepare is used in arch Makefiles and when processed asm symlink,
 951# version.h and scripts_basic is processed / created.
 952
 953# Listed in dependency order
 954PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 955
 956# prepare3 is used to check if we are building in a separate output directory,
 957# and if so do:
 958# 1) Check that make has not been executed in the kernel src $(srctree)
 959# 2) Create the include2 directory, used for the second asm symlink
 960prepare3: include/config/kernel.release
 961ifneq ($(KBUILD_SRC),)
 962        @$(kecho) '  Using $(srctree) as source for kernel'
 963        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 964                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 965                echo "  in the '$(srctree)' directory.";\
 966                /bin/false; \
 967        fi;
 968        $(Q)if [ ! -d include2 ]; then                                  \
 969            mkdir -p include2;                                          \
 970            ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 971        fi
 972endif
 973
 974# prepare2 creates a makefile if using a separate output directory
 975prepare2: prepare3 outputmakefile
 976
 977prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 978                   include/asm include/config/auto.conf
 979        $(cmd_crmodverdir)
 980
 981archprepare: prepare1 scripts_basic
 982
 983prepare0: archprepare FORCE
 984        $(Q)$(MAKE) $(build)=.
 985        $(Q)$(MAKE) $(build)=. missing-syscalls
 986
 987# All the preparing..
 988prepare: prepare0
 989
 990# Leave this as default for preprocessing vmlinux.lds.S, which is now
 991# done in arch/$(ARCH)/kernel/Makefile
 992
 993export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 994
 995# The asm symlink changes when $(ARCH) changes.
 996# Detect this and ask user to run make mrproper
 997# If asm is a stale symlink (point to dir that does not exist) remove it
 998define check-symlink
 999        set -e;                                                            \
1000        if [ -L include/asm ]; then                                        \
1001                asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
1002                if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
1003                        echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1004                        echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1005                        exit 1;                                            \
1006                fi;                                                        \
1007                test -e $$asmlink || rm include/asm;                       \
1008        elif [ -d include/asm ]; then                                      \
1009                echo "ERROR: $@ is a directory but a symlink was expected";\
1010                exit 1;                                                    \
1011        fi
1012endef
1013
1014# We create the target directory of the symlink if it does
1015# not exist so the test in check-symlink works and we have a
1016# directory for generated filesas used by some architectures.
1017define create-symlink
1018        if [ ! -L include/asm ]; then                                      \
1019                        $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1020                        if [ ! -d include/asm-$(SRCARCH) ]; then           \
1021                                mkdir -p include/asm-$(SRCARCH);           \
1022                        fi;                                                \
1023                        ln -fsn asm-$(SRCARCH) $@;                         \
1024        fi
1025endef
1026
1027include/asm: FORCE
1028        $(Q)$(check-symlink)
1029        $(Q)$(create-symlink)
1030
1031# Generate some files
1032# ---------------------------------------------------------------------------
1033
1034# KERNELRELEASE can change from a few different places, meaning version.h
1035# needs to be updated, so this check is forced on all builds
1036
1037uts_len := 64
1038define filechk_utsrelease.h
1039        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1040          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1041          exit 1;                                                         \
1042        fi;                                                               \
1043        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1044endef
1045
1046define filechk_version.h
1047        (echo \#define LINUX_VERSION_CODE $(shell                             \
1048        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1049        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1050endef
1051
1052include/linux/version.h: $(srctree)/Makefile FORCE
1053        $(call filechk,version.h)
1054
1055include/linux/utsrelease.h: include/config/kernel.release FORCE
1056        $(call filechk,utsrelease.h)
1057
1058PHONY += headerdep
1059headerdep:
1060        $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1061
1062# ---------------------------------------------------------------------------
1063
1064PHONY += depend dep
1065depend dep:
1066        @echo '*** Warning: make $@ is unnecessary now.'
1067
1068# ---------------------------------------------------------------------------
1069# Firmware install
1070INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1071export INSTALL_FW_PATH
1072
1073PHONY += firmware_install
1074firmware_install: FORCE
1075        @mkdir -p $(objtree)/firmware
1076        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1077
1078# ---------------------------------------------------------------------------
1079# Kernel headers
1080
1081#Default location for installed headers
1082export INSTALL_HDR_PATH = $(objtree)/usr
1083
1084hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1085# Find out where the Kbuild file is located to support
1086# arch/$(ARCH)/include/asm
1087hdr-dir = $(strip                                                         \
1088          $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1089               arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1090
1091# If we do an all arch process set dst to asm-$(hdr-arch)
1092hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1093
1094PHONY += __headers
1095__headers: include/linux/version.h scripts_basic FORCE
1096        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1097
1098PHONY += headers_install_all
1099headers_install_all:
1100        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1101
1102PHONY += headers_install
1103headers_install: __headers
1104        $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1105        $(error Headers not exportable for the $(SRCARCH) architecture))
1106        $(Q)$(MAKE) $(hdr-inst)=include
1107        $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1108
1109PHONY += headers_check_all
1110headers_check_all: headers_install_all
1111        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1112
1113PHONY += headers_check
1114headers_check: headers_install
1115        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1116        $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1117
1118# ---------------------------------------------------------------------------
1119# Modules
1120
1121ifdef CONFIG_MODULES
1122
1123# By default, build modules as well
1124
1125all: modules
1126
1127#       Build modules
1128#
1129#       A module can be listed more than once in obj-m resulting in
1130#       duplicate lines in modules.order files.  Those are removed
1131#       using awk while concatenating to the final file.
1132
1133PHONY += modules
1134modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1135        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1136        @$(kecho) '  Building modules, stage 2.';
1137        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1138        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1139
1140
1141# Target to prepare building external modules
1142PHONY += modules_prepare
1143modules_prepare: prepare scripts
1144
1145# Target to install modules
1146PHONY += modules_install
1147modules_install: _modinst_ _modinst_post
1148
1149PHONY += _modinst_
1150_modinst_:
1151        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1152                echo "Warning: you may need to install module-init-tools"; \
1153                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1154                sleep 1; \
1155        fi
1156        @rm -rf $(MODLIB)/kernel
1157        @rm -f $(MODLIB)/source
1158        @mkdir -p $(MODLIB)/kernel
1159        @ln -s $(srctree) $(MODLIB)/source
1160        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1161                rm -f $(MODLIB)/build ; \
1162                ln -s $(objtree) $(MODLIB)/build ; \
1163        fi
1164        @cp -f $(objtree)/modules.order $(MODLIB)/
1165        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1166
1167# This depmod is only for convenience to give the initial
1168# boot a modules.dep even before / is mounted read-write.  However the
1169# boot script depmod is the master version.
1170PHONY += _modinst_post
1171_modinst_post: _modinst_
1172        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1173        $(call cmd,depmod)
1174
1175else # CONFIG_MODULES
1176
1177# Modules not configured
1178# ---------------------------------------------------------------------------
1179
1180modules modules_install: FORCE
1181        @echo
1182        @echo "The present kernel configuration has modules disabled."
1183        @echo "Type 'make config' and enable loadable module support."
1184        @echo "Then build a kernel with module support enabled."
1185        @echo
1186        @exit 1
1187
1188endif # CONFIG_MODULES
1189
1190###
1191# Cleaning is done on three levels.
1192# make clean     Delete most generated files
1193#                Leave enough to build external modules
1194# make mrproper  Delete the current configuration, and all generated files
1195# make distclean Remove editor backup files, patch leftover files and the like
1196
1197# Directories & files removed with 'make clean'
1198CLEAN_DIRS  += $(MODVERDIR)
1199CLEAN_FILES +=  vmlinux System.map \
1200                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1201
1202# Directories & files removed with 'make mrproper'
1203MRPROPER_DIRS  += include/config include2 usr/include include/generated
1204MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1205                  include/linux/autoconf.h include/linux/version.h      \
1206                  include/linux/utsrelease.h                            \
1207                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1208                  Module.symvers Module.markers tags TAGS cscope*
1209
1210# clean - Delete most, but leave enough to build external modules
1211#
1212clean: rm-dirs  := $(CLEAN_DIRS)
1213clean: rm-files := $(CLEAN_FILES)
1214clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1215
1216PHONY += $(clean-dirs) clean archclean
1217$(clean-dirs):
1218        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1219
1220clean: archclean $(clean-dirs)
1221        $(call cmd,rmdirs)
1222        $(call cmd,rmfiles)
1223        @find . $(RCS_FIND_IGNORE) \
1224                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1225                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1226                -o -name '*.symtypes' -o -name 'modules.order' \
1227                -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1228                -type f -print | xargs rm -f
1229
1230# mrproper - Delete all generated files, including .config
1231#
1232mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1233mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1234mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1235
1236PHONY += $(mrproper-dirs) mrproper archmrproper
1237$(mrproper-dirs):
1238        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1239
1240mrproper: clean archmrproper $(mrproper-dirs)
1241        $(call cmd,rmdirs)
1242        $(call cmd,rmfiles)
1243
1244# distclean
1245#
1246PHONY += distclean
1247
1248distclean: mrproper
1249        @find $(srctree) $(RCS_FIND_IGNORE) \
1250                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1251                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1252                -o -name '.*.rej' -o -size 0 \
1253                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1254                -type f -print | xargs rm -f
1255
1256
1257# Packaging of the kernel to various formats
1258# ---------------------------------------------------------------------------
1259# rpm target kept for backward compatibility
1260package-dir     := $(srctree)/scripts/package
1261
1262%pkg: include/config/kernel.release FORCE
1263        $(Q)$(MAKE) $(build)=$(package-dir) $@
1264rpm: include/config/kernel.release FORCE
1265        $(Q)$(MAKE) $(build)=$(package-dir) $@
1266
1267
1268# Brief documentation of the typical targets used
1269# ---------------------------------------------------------------------------
1270
1271boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1272boards := $(notdir $(boards))
1273board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1274board-dirs := $(sort $(notdir $(board-dirs:/=)))
1275
1276help:
1277        @echo  'Cleaning targets:'
1278        @echo  '  clean           - Remove most generated files but keep the config and'
1279        @echo  '                    enough build support to build external modules'
1280        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1281        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1282        @echo  ''
1283        @echo  'Configuration targets:'
1284        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1285        @echo  ''
1286        @echo  'Other generic targets:'
1287        @echo  '  all             - Build all targets marked with [*]'
1288        @echo  '* vmlinux         - Build the bare kernel'
1289        @echo  '* modules         - Build all modules'
1290        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1291        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1292        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1293        @echo  '  dir/            - Build all files in dir and below'
1294        @echo  '  dir/file.[ois]  - Build specified target only'
1295        @echo  '  dir/file.ko     - Build module including final link'
1296        @echo  '  modules_prepare - Set up for building external modules'
1297        @echo  '  tags/TAGS       - Generate tags file for editors'
1298        @echo  '  cscope          - Generate cscope index'
1299        @echo  '  kernelrelease   - Output the release version string'
1300        @echo  '  kernelversion   - Output the version stored in Makefile'
1301        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1302         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1303         echo  ''
1304        @echo  'Static analysers'
1305        @echo  '  checkstack      - Generate a list of stack hogs'
1306        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1307        @echo  '  versioncheck    - Sanity check on version.h usage'
1308        @echo  '  includecheck    - Check for duplicate included header files'
1309        @echo  '  export_report   - List the usages of all exported symbols'
1310        @echo  '  headers_check   - Sanity check on exported headers'
1311        @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1312         echo  ''
1313        @echo  'Kernel packaging:'
1314        @$(MAKE) $(build)=$(package-dir) help
1315        @echo  ''
1316        @echo  'Documentation targets:'
1317        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1318        @echo  ''
1319        @echo  'Architecture specific targets ($(SRCARCH)):'
1320        @$(if $(archhelp),$(archhelp),\
1321                echo '  No architecture specific help defined for $(SRCARCH)')
1322        @echo  ''
1323        @$(if $(boards), \
1324                $(foreach b, $(boards), \
1325                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1326                echo '')
1327        @$(if $(board-dirs), \
1328                $(foreach b, $(board-dirs), \
1329                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1330                printf "  %-16s - Show all of the above\\n" help-boards; \
1331                echo '')
1332
1333        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1334        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1335        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1336        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1337        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1338        @echo  ''
1339        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1340        @echo  'For further info see the ./README file'
1341
1342
1343help-board-dirs := $(addprefix help-,$(board-dirs))
1344
1345help-boards: $(help-board-dirs)
1346
1347boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1348
1349$(help-board-dirs): help-%:
1350        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1351        @$(if $(boards-per-dir), \
1352                $(foreach b, $(boards-per-dir), \
1353                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1354                echo '')
1355
1356
1357# Documentation targets
1358# ---------------------------------------------------------------------------
1359%docs: scripts_basic FORCE
1360        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1361
1362else # KBUILD_EXTMOD
1363
1364###
1365# External module support.
1366# When building external modules the kernel used as basis is considered
1367# read-only, and no consistency checks are made and the make
1368# system is not used on the basis kernel. If updates are required
1369# in the basis kernel ordinary make commands (without M=...) must
1370# be used.
1371#
1372# The following are the only valid targets when building external
1373# modules.
1374# make M=dir clean     Delete all automatically generated files
1375# make M=dir modules   Make all modules in specified dir
1376# make M=dir           Same as 'make M=dir modules'
1377# make M=dir modules_install
1378#                      Install the modules built in the module directory
1379#                      Assumes install directory is already created
1380
1381# We are always building modules
1382KBUILD_MODULES := 1
1383PHONY += crmodverdir
1384crmodverdir:
1385        $(cmd_crmodverdir)
1386
1387PHONY += $(objtree)/Module.symvers
1388$(objtree)/Module.symvers:
1389        @test -e $(objtree)/Module.symvers || ( \
1390        echo; \
1391        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1392        echo "           is missing; modules will have no dependencies and modversions."; \
1393        echo )
1394
1395module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1396PHONY += $(module-dirs) modules
1397$(module-dirs): crmodverdir $(objtree)/Module.symvers
1398        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1399
1400modules: $(module-dirs)
1401        @$(kecho) '  Building modules, stage 2.';
1402        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1403
1404PHONY += modules_install
1405modules_install: _emodinst_ _emodinst_post
1406
1407install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1408PHONY += _emodinst_
1409_emodinst_:
1410        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1411        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1412
1413PHONY += _emodinst_post
1414_emodinst_post: _emodinst_
1415        $(call cmd,depmod)
1416
1417clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1418
1419PHONY += $(clean-dirs) clean
1420$(clean-dirs):
1421        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1422
1423clean:  rm-dirs := $(MODVERDIR)
1424clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1425                   $(KBUILD_EXTMOD)/Module.markers \
1426                   $(KBUILD_EXTMOD)/modules.order
1427clean: $(clean-dirs)
1428        $(call cmd,rmdirs)
1429        $(call cmd,rmfiles)
1430        @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1431                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1432                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1433                -type f -print | xargs rm -f
1434
1435help:
1436        @echo  '  Building external modules.'
1437        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1438        @echo  ''
1439        @echo  '  modules         - default target, build the module(s)'
1440        @echo  '  modules_install - install the module'
1441        @echo  '  clean           - remove generated files in module directory only'
1442        @echo  ''
1443
1444# Dummies...
1445PHONY += prepare scripts
1446prepare: ;
1447scripts: ;
1448endif # KBUILD_EXTMOD
1449
1450# Generate tags for editors
1451# ---------------------------------------------------------------------------
1452quiet_cmd_tags = GEN     $@
1453      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1454
1455tags TAGS cscope: FORCE
1456        $(call cmd,tags)
1457
1458# Scripts to check various things for consistency
1459# ---------------------------------------------------------------------------
1460
1461includecheck:
1462        find * $(RCS_FIND_IGNORE) \
1463                -name '*.[hcS]' -type f -print | sort \
1464                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1465
1466versioncheck:
1467        find * $(RCS_FIND_IGNORE) \
1468                -name '*.[hcS]' -type f -print | sort \
1469                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1470
1471namespacecheck:
1472        $(PERL) $(srctree)/scripts/namespace.pl
1473
1474export_report:
1475        $(PERL) $(srctree)/scripts/export_report.pl
1476
1477endif #ifeq ($(config-targets),1)
1478endif #ifeq ($(mixed-targets),1)
1479
1480PHONY += checkstack kernelrelease kernelversion
1481
1482# UML needs a little special treatment here.  It wants to use the host
1483# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1484# else wants $(ARCH), including people doing cross-builds, which means
1485# that $(SUBARCH) doesn't work here.
1486ifeq ($(ARCH), um)
1487CHECKSTACK_ARCH := $(SUBARCH)
1488else
1489CHECKSTACK_ARCH := $(ARCH)
1490endif
1491checkstack:
1492        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1493        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1494
1495kernelrelease:
1496        $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1497        $(error kernelrelease not valid - run 'make prepare' to update it))
1498kernelversion:
1499        @echo $(KERNELVERSION)
1500
1501# Single targets
1502# ---------------------------------------------------------------------------
1503# Single targets are compatible with:
1504# - build with mixed source and output
1505# - build with separate output dir 'make O=...'
1506# - external modules
1507#
1508#  target-dir => where to store outputfile
1509#  build-dir  => directory in kernel source tree to use
1510
1511ifeq ($(KBUILD_EXTMOD),)
1512        build-dir  = $(patsubst %/,%,$(dir $@))
1513        target-dir = $(dir $@)
1514else
1515        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1516        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1517        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1518endif
1519
1520%.s: %.c prepare scripts FORCE
1521        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522%.i: %.c prepare scripts FORCE
1523        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524%.o: %.c prepare scripts FORCE
1525        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526%.lst: %.c prepare scripts FORCE
1527        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528%.s: %.S prepare scripts FORCE
1529        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530%.o: %.S prepare scripts FORCE
1531        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532%.symtypes: %.c prepare scripts FORCE
1533        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534
1535# Modules
1536/: prepare scripts FORCE
1537        $(cmd_crmodverdir)
1538        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1539        $(build)=$(build-dir)
1540%/: prepare scripts FORCE
1541        $(cmd_crmodverdir)
1542        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1543        $(build)=$(build-dir)
1544%.ko: prepare scripts FORCE
1545        $(cmd_crmodverdir)
1546        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1547        $(build)=$(build-dir) $(@:.ko=.o)
1548        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1549
1550# FIXME Should go into a make.lib or something 
1551# ===========================================================================
1552
1553quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1554      cmd_rmdirs = rm -rf $(rm-dirs)
1555
1556quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1557      cmd_rmfiles = rm -f $(rm-files)
1558
1559# Run depmod only if we have System.map and depmod is executable
1560quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1561      cmd_depmod = \
1562        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1563                $(DEPMOD) -ae -F System.map                                     \
1564                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1565                $(KERNELRELEASE);                                               \
1566        fi
1567
1568# Create temporary dir for module support files
1569# clean it up only when building all modules
1570cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1571                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1572
1573a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1574          $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1575          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1576
1577quiet_cmd_as_o_S = AS      $@
1578cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1579
1580# read all saved command lines
1581
1582targets := $(wildcard $(sort $(targets)))
1583cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1584
1585ifneq ($(cmd_files),)
1586  $(cmd_files): ;       # Do not try to update included dependency files
1587  include $(cmd_files)
1588endif
1589
1590# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1591# Usage:
1592# $(Q)$(MAKE) $(clean)=dir
1593clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1594
1595endif   # skip-makefile
1596
1597PHONY += FORCE
1598FORCE:
1599
1600# Declare the contents of the .PHONY variable as phony.  We keep that
1601# information in a variable so we can use it in if_changed and friends.
1602.PHONY: $(PHONY)
1603
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