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   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 30
   4EXTRAVERSION = .3
   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 \
 355                   -fno-delete-null-pointer-checks
 356KBUILD_AFLAGS   := -D__ASSEMBLY__
 357
 358# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 359KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 360KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 361
 362export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 363export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 364export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 365export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 366
 367export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 368export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 369export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 370
 371# When compiling out-of-tree modules, put MODVERDIR in the module
 372# tree rather than in the kernel tree. The kernel tree might
 373# even be read-only.
 374export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 375
 376# Files to ignore in find ... statements
 377
 378RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 379export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 380
 381# ===========================================================================
 382# Rules shared between *config targets and build targets
 383
 384# Basic helpers built in scripts/
 385PHONY += scripts_basic
 386scripts_basic:
 387        $(Q)$(MAKE) $(build)=scripts/basic
 388
 389# To avoid any implicit rule to kick in, define an empty command.
 390scripts/basic/%: scripts_basic ;
 391
 392PHONY += outputmakefile
 393# outputmakefile generates a Makefile in the output directory, if using a
 394# separate output directory. This allows convenient use of make in the
 395# output directory.
 396outputmakefile:
 397ifneq ($(KBUILD_SRC),)
 398        $(Q)ln -fsn $(srctree) source
 399        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 400            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 401endif
 402
 403# To make sure we do not include .config for any of the *config targets
 404# catch them early, and hand them over to scripts/kconfig/Makefile
 405# It is allowed to specify more targets when calling make, including
 406# mixing *config targets and build targets.
 407# For example 'make oldconfig all'.
 408# Detect when mixed targets is specified, and make a second invocation
 409# of make so .config is not included in this case either (for *config).
 410
 411no-dot-config-targets := clean mrproper distclean \
 412                         cscope TAGS tags help %docs check% \
 413                         include/linux/version.h headers_% \
 414                         kernelrelease kernelversion
 415
 416config-targets := 0
 417mixed-targets  := 0
 418dot-config     := 1
 419
 420ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 421        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 422                dot-config := 0
 423        endif
 424endif
 425
 426ifeq ($(KBUILD_EXTMOD),)
 427        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 428                config-targets := 1
 429                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 430                        mixed-targets := 1
 431                endif
 432        endif
 433endif
 434
 435ifeq ($(mixed-targets),1)
 436# ===========================================================================
 437# We're called with mixed targets (*config and build targets).
 438# Handle them one by one.
 439
 440%:: FORCE
 441        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 442
 443else
 444ifeq ($(config-targets),1)
 445# ===========================================================================
 446# *config targets only - make sure prerequisites are updated, and descend
 447# in scripts/kconfig to make the *config target
 448
 449# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 450# KBUILD_DEFCONFIG may point out an alternative default configuration
 451# used for 'make defconfig'
 452include $(srctree)/arch/$(SRCARCH)/Makefile
 453export KBUILD_DEFCONFIG KBUILD_KCONFIG
 454
 455config: scripts_basic outputmakefile FORCE
 456        $(Q)mkdir -p include/linux include/config
 457        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 458
 459%config: scripts_basic outputmakefile FORCE
 460        $(Q)mkdir -p include/linux include/config
 461        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 462
 463else
 464# ===========================================================================
 465# Build targets only - this includes vmlinux, arch specific targets, clean
 466# targets and others. In general all targets except *config targets.
 467
 468ifeq ($(KBUILD_EXTMOD),)
 469# Additional helpers built in scripts/
 470# Carefully list dependencies so we do not try to build scripts twice
 471# in parallel
 472PHONY += scripts
 473scripts: scripts_basic include/config/auto.conf
 474        $(Q)$(MAKE) $(build)=$(@)
 475
 476# Objects we will link into vmlinux / subdirs we need to visit
 477init-y          := init/
 478drivers-y       := drivers/ sound/ firmware/
 479net-y           := net/
 480libs-y          := lib/
 481core-y          := usr/
 482endif # KBUILD_EXTMOD
 483
 484ifeq ($(dot-config),1)
 485# Read in config
 486-include include/config/auto.conf
 487
 488ifeq ($(KBUILD_EXTMOD),)
 489# Read in dependencies to all Kconfig* files, make sure to run
 490# oldconfig if changes are detected.
 491-include include/config/auto.conf.cmd
 492
 493# To avoid any implicit rule to kick in, define an empty command
 494$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 495
 496# If .config is newer than include/config/auto.conf, someone tinkered
 497# with it and forgot to run make oldconfig.
 498# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 499# we execute the config step to be sure to catch updated Kconfig files
 500include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 501        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 502else
 503# external modules needs include/linux/autoconf.h and include/config/auto.conf
 504# but do not care if they are up-to-date. Use auto.conf to trigger the test
 505PHONY += include/config/auto.conf
 506
 507include/config/auto.conf:
 508        $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 509        echo;                                                           \
 510        echo "  ERROR: Kernel configuration is invalid.";               \
 511        echo "         include/linux/autoconf.h or $@ are missing.";    \
 512        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 513        echo;                                                           \
 514        /bin/false)
 515
 516endif # KBUILD_EXTMOD
 517
 518else
 519# Dummy target needed, because used as prerequisite
 520include/config/auto.conf: ;
 521endif # $(dot-config)
 522
 523# The all: target is the default when no target is given on the
 524# command line.
 525# This allow a user to issue only 'make' to build a kernel including modules
 526# Defaults vmlinux but it is usually overridden in the arch makefile
 527all: vmlinux
 528
 529ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 530KBUILD_CFLAGS   += -Os
 531else
 532KBUILD_CFLAGS   += -O2
 533endif
 534
 535include $(srctree)/arch/$(SRCARCH)/Makefile
 536
 537ifneq ($(CONFIG_FRAME_WARN),0)
 538KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 539endif
 540
 541# Force gcc to behave correct even for buggy distributions
 542ifndef CONFIG_CC_STACKPROTECTOR
 543KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 544endif
 545
 546ifdef CONFIG_FRAME_POINTER
 547KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 548else
 549KBUILD_CFLAGS   += -fomit-frame-pointer
 550endif
 551
 552ifdef CONFIG_DEBUG_INFO
 553KBUILD_CFLAGS   += -g
 554KBUILD_AFLAGS   += -gdwarf-2
 555endif
 556
 557ifdef CONFIG_FUNCTION_TRACER
 558KBUILD_CFLAGS   += -pg
 559endif
 560
 561# We trigger additional mismatches with less inlining
 562ifdef CONFIG_DEBUG_SECTION_MISMATCH
 563KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 564endif
 565
 566# arch Makefile may override CC so keep this after arch Makefile is included
 567NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 568CHECKFLAGS     += $(NOSTDINC_FLAGS)
 569
 570# warn about C99 declaration after statement
 571KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 572
 573# disable pointer signed / unsigned warnings in gcc 4.0
 574KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 575
 576# disable invalid "can't wrap" optimizations for signed / pointers
 577KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 578
 579# revert to pre-gcc-4.4 behaviour of .eh_frame
 580KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 581
 582# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 583# But warn user when we do so
 584warn-assign = \
 585$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 586
 587ifneq ($(KCPPFLAGS),)
 588        $(call warn-assign,CPPFLAGS)
 589        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 590endif
 591ifneq ($(KAFLAGS),)
 592        $(call warn-assign,AFLAGS)
 593        KBUILD_AFLAGS += $(KAFLAGS)
 594endif
 595ifneq ($(KCFLAGS),)
 596        $(call warn-assign,CFLAGS)
 597        KBUILD_CFLAGS += $(KCFLAGS)
 598endif
 599
 600# Use --build-id when available.
 601LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 602                              $(call ld-option, -Wl$(comma)--build-id,))
 603LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 604LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 605
 606ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 607LDFLAGS_vmlinux += -X
 608endif
 609
 610# Default kernel image to build when no specific target is given.
 611# KBUILD_IMAGE may be overruled on the command line or
 612# set in the environment
 613# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 614# this default value
 615export KBUILD_IMAGE ?= vmlinux
 616
 617#
 618# INSTALL_PATH specifies where to place the updated kernel and system map
 619# images. Default is /boot, but you can set it to other values
 620export  INSTALL_PATH ?= /boot
 621
 622#
 623# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 624# relocations required by build roots.  This is not defined in the
 625# makefile but the argument can be passed to make if needed.
 626#
 627
 628MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 629export MODLIB
 630
 631#
 632#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 633#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 634#  the default option --strip-debug will be used.  Otherwise,
 635#  INSTALL_MOD_STRIP will used as the options to the strip command.
 636
 637ifdef INSTALL_MOD_STRIP
 638ifeq ($(INSTALL_MOD_STRIP),1)
 639mod_strip_cmd = $(STRIP) --strip-debug
 640else
 641mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 642endif # INSTALL_MOD_STRIP=1
 643else
 644mod_strip_cmd = true
 645endif # INSTALL_MOD_STRIP
 646export mod_strip_cmd
 647
 648
 649ifeq ($(KBUILD_EXTMOD),)
 650core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 651
 652vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 653                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 654                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 655
 656vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 657                     $(init-n) $(init-) \
 658                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 659                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 660
 661init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 662core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 663drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 664net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 665libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 666libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 667libs-y          := $(libs-y1) $(libs-y2)
 668
 669# Build vmlinux
 670# ---------------------------------------------------------------------------
 671# vmlinux is built from the objects selected by $(vmlinux-init) and
 672# $(vmlinux-main). Most are built-in.o files from top-level directories
 673# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 674# Ordering when linking is important, and $(vmlinux-init) must be first.
 675#
 676# vmlinux
 677#   ^
 678#   |
 679#   +-< $(vmlinux-init)
 680#   |   +--< init/version.o + more
 681#   |
 682#   +--< $(vmlinux-main)
 683#   |    +--< driver/built-in.o mm/built-in.o + more
 684#   |
 685#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 686#
 687# vmlinux version (uname -v) cannot be updated during normal
 688# descending-into-subdirs phase since we do not yet know if we need to
 689# update vmlinux.
 690# Therefore this step is delayed until just before final link of vmlinux -
 691# except in the kallsyms case where it is done just before adding the
 692# symbols to the kernel.
 693#
 694# System.map is generated to document addresses of all kernel symbols
 695
 696vmlinux-init := $(head-y) $(init-y)
 697vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 698vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 699vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 700export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 701
 702# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 703# May be overridden by arch/$(ARCH)/Makefile
 704quiet_cmd_vmlinux__ ?= LD      $@
 705      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 706      -T $(vmlinux-lds) $(vmlinux-init)                          \
 707      --start-group $(vmlinux-main) --end-group                  \
 708      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 709
 710# Generate new vmlinux version
 711quiet_cmd_vmlinux_version = GEN     .version
 712      cmd_vmlinux_version = set -e;                     \
 713        if [ ! -r .version ]; then                      \
 714          rm -f .version;                               \
 715          echo 1 >.version;                             \
 716        else                                            \
 717          mv .version .old_version;                     \
 718          expr 0$$(cat .old_version) + 1 >.version;     \
 719        fi;                                             \
 720        $(MAKE) $(build)=init
 721
 722# Generate System.map
 723quiet_cmd_sysmap = SYSMAP
 724      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 725
 726# Link of vmlinux
 727# If CONFIG_KALLSYMS is set .version is already updated
 728# Generate System.map and verify that the content is consistent
 729# Use + in front of the vmlinux_version rule to silent warning with make -j2
 730# First command is ':' to allow us to use + in front of the rule
 731define rule_vmlinux__
 732        :
 733        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 734
 735        $(call cmd,vmlinux__)
 736        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 737
 738        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 739          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 740        $(cmd_sysmap) $@ System.map;                                         \
 741        if [ $$? -ne 0 ]; then                                               \
 742                rm -f $@;                                                    \
 743                /bin/false;                                                  \
 744        fi;
 745        $(verify_kallsyms)
 746endef
 747
 748
 749ifdef CONFIG_KALLSYMS
 750# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 751# It's a three stage process:
 752# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 753#   empty
 754#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 755#   the right size - vmlinux version (uname -v) is updated during this step
 756# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 757#   but due to the added section, some addresses have shifted.
 758#   From here, we generate a correct .tmp_kallsyms2.o
 759# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 760# o Verify that the System.map from vmlinux matches the map from
 761#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 762# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 763#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 764#   temporary bypass to allow the kernel to be built while the
 765#   maintainers work out what went wrong with kallsyms.
 766
 767ifdef CONFIG_KALLSYMS_EXTRA_PASS
 768last_kallsyms := 3
 769else
 770last_kallsyms := 2
 771endif
 772
 773kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 774
 775define verify_kallsyms
 776        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 777          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 778          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 779        $(Q)cmp -s System.map .tmp_System.map ||                             \
 780                (echo Inconsistent kallsyms data;                            \
 781                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 782                 rm .tmp_kallsyms* ; /bin/false )
 783endef
 784
 785# Update vmlinux version before link
 786# Use + in front of this rule to silent warning about make -j1
 787# First command is ':' to allow us to use + in front of this rule
 788cmd_ksym_ld = $(cmd_vmlinux__)
 789define rule_ksym_ld
 790        : 
 791        +$(call cmd,vmlinux_version)
 792        $(call cmd,vmlinux__)
 793        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 794endef
 795
 796# Generate .S file with all kernel symbols
 797quiet_cmd_kallsyms = KSYM    $@
 798      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 799                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 800
 801.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 802        $(call if_changed_dep,as_o_S)
 803
 804.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 805        $(call cmd,kallsyms)
 806
 807# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 808.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 809        $(call if_changed_rule,ksym_ld)
 810
 811.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 812        $(call if_changed,vmlinux__)
 813
 814.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 815        $(call if_changed,vmlinux__)
 816
 817# Needs to visit scripts/ before $(KALLSYMS) can be used.
 818$(KALLSYMS): scripts ;
 819
 820# Generate some data for debugging strange kallsyms problems
 821debug_kallsyms: .tmp_map$(last_kallsyms)
 822
 823.tmp_map%: .tmp_vmlinux% FORCE
 824        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 825
 826.tmp_map3: .tmp_map2
 827
 828.tmp_map2: .tmp_map1
 829
 830endif # ifdef CONFIG_KALLSYMS
 831
 832# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 833# relevant sections renamed as per the linker script.
 834quiet_cmd_vmlinux-modpost = LD      $@
 835      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 836         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 837         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 838define rule_vmlinux-modpost
 839        :
 840        +$(call cmd,vmlinux-modpost)
 841        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 842        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 843endef
 844
 845# vmlinux image - including updated kernel symbols
 846vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 847ifdef CONFIG_HEADERS_CHECK
 848        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 849endif
 850ifdef CONFIG_SAMPLES
 851        $(Q)$(MAKE) $(build)=samples
 852endif
 853ifdef CONFIG_BUILD_DOCSRC
 854        $(Q)$(MAKE) $(build)=Documentation
 855endif
 856        $(call vmlinux-modpost)
 857        $(call if_changed_rule,vmlinux__)
 858        $(Q)rm -f .old_version
 859
 860# build vmlinux.o first to catch section mismatch errors early
 861ifdef CONFIG_KALLSYMS
 862.tmp_vmlinux1: vmlinux.o
 863endif
 864
 865modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 866vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 867        $(call if_changed_rule,vmlinux-modpost)
 868
 869# The actual objects are generated when descending, 
 870# make sure no implicit rule kicks in
 871$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 872
 873# Handle descending into subdirectories listed in $(vmlinux-dirs)
 874# Preset locale variables to speed up the build process. Limit locale
 875# tweaks to this spot to avoid wrong language settings when running
 876# make menuconfig etc.
 877# Error messages still appears in the original language
 878
 879PHONY += $(vmlinux-dirs)
 880$(vmlinux-dirs): prepare scripts
 881        $(Q)$(MAKE) $(build)=$@
 882
 883# Build the kernel release string
 884#
 885# The KERNELRELEASE value built here is stored in the file
 886# include/config/kernel.release, and is used when executing several
 887# make targets, such as "make install" or "make modules_install."
 888#
 889# The eventual kernel release string consists of the following fields,
 890# shown in a hierarchical format to show how smaller parts are concatenated
 891# to form the larger and final value, with values coming from places like
 892# the Makefile, kernel config options, make command line options and/or
 893# SCM tag information.
 894#
 895#       $(KERNELVERSION)
 896#         $(VERSION)                    eg, 2
 897#         $(PATCHLEVEL)                 eg, 6
 898#         $(SUBLEVEL)                   eg, 18
 899#         $(EXTRAVERSION)               eg, -rc6
 900#       $(localver-full)
 901#         $(localver)
 902#           localversion*               (files without backups, containing '~')
 903#           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 904#         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 905#           ./scripts/setlocalversion   (SCM tag, if one exists)
 906#           $(LOCALVERSION)             (from make command line if provided)
 907#
 908#  Note how the final $(localver-auto) string is included *only* if the
 909# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 910# moment, only git is supported but other SCMs can edit the script
 911# scripts/setlocalversion and add the appropriate checks as needed.
 912
 913pattern = ".*/localversion[^~]*"
 914string  = $(shell cat /dev/null \
 915           `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 916
 917localver = $(subst $(space),, $(string) \
 918                              $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 919
 920# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 921# and if the SCM is know a tag from the SCM is appended.
 922# The appended tag is determined by the SCM used.
 923#
 924# .scmversion is used when generating rpm packages so we do not loose
 925# the version information from the SCM when we do the build of the kernel
 926# from the copied source
 927ifdef CONFIG_LOCALVERSION_AUTO
 928
 929ifeq ($(wildcard .scmversion),)
 930        _localver-auto = $(shell $(CONFIG_SHELL) \
 931                         $(srctree)/scripts/setlocalversion $(srctree))
 932else
 933        _localver-auto = $(shell cat .scmversion 2> /dev/null)
 934endif
 935
 936        localver-auto  = $(LOCALVERSION)$(_localver-auto)
 937endif
 938
 939localver-full = $(localver)$(localver-auto)
 940
 941# Store (new) KERNELRELASE string in include/config/kernel.release
 942kernelrelease = $(KERNELVERSION)$(localver-full)
 943include/config/kernel.release: include/config/auto.conf FORCE
 944        $(Q)rm -f $@
 945        $(Q)echo $(kernelrelease) > $@
 946
 947
 948# Things we need to do before we recursively start building the kernel
 949# or the modules are listed in "prepare".
 950# A multi level approach is used. prepareN is processed before prepareN-1.
 951# archprepare is used in arch Makefiles and when processed asm symlink,
 952# version.h and scripts_basic is processed / created.
 953
 954# Listed in dependency order
 955PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 956
 957# prepare3 is used to check if we are building in a separate output directory,
 958# and if so do:
 959# 1) Check that make has not been executed in the kernel src $(srctree)
 960# 2) Create the include2 directory, used for the second asm symlink
 961prepare3: include/config/kernel.release
 962ifneq ($(KBUILD_SRC),)
 963        @$(kecho) '  Using $(srctree) as source for kernel'
 964        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 965                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 966                echo "  in the '$(srctree)' directory.";\
 967                /bin/false; \
 968        fi;
 969        $(Q)if [ ! -d include2 ]; then                                  \
 970            mkdir -p include2;                                          \
 971            ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 972        fi
 973endif
 974
 975# prepare2 creates a makefile if using a separate output directory
 976prepare2: prepare3 outputmakefile
 977
 978prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 979                   include/asm include/config/auto.conf
 980        $(cmd_crmodverdir)
 981
 982archprepare: prepare1 scripts_basic
 983
 984prepare0: archprepare FORCE
 985        $(Q)$(MAKE) $(build)=.
 986        $(Q)$(MAKE) $(build)=. missing-syscalls
 987
 988# All the preparing..
 989prepare: prepare0
 990
 991# Leave this as default for preprocessing vmlinux.lds.S, which is now
 992# done in arch/$(ARCH)/kernel/Makefile
 993
 994export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 995
 996# The asm symlink changes when $(ARCH) changes.
 997# Detect this and ask user to run make mrproper
 998# If asm is a stale symlink (point to dir that does not exist) remove it
 999define check-symlink
1000        set -e;                                                            \
1001        if [ -L include/asm ]; then                                        \
1002                asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
1003                if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
1004                        echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1005                        echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
1006                        exit 1;                                            \
1007                fi;                                                        \
1008                test -e $$asmlink || rm include/asm;                       \
1009        elif [ -d include/asm ]; then                                      \
1010                echo "ERROR: $@ is a directory but a symlink was expected";\
1011                exit 1;                                                    \
1012        fi
1013endef
1014
1015# We create the target directory of the symlink if it does
1016# not exist so the test in check-symlink works and we have a
1017# directory for generated filesas used by some architectures.
1018define create-symlink
1019        if [ ! -L include/asm ]; then                                      \
1020                        $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1021                        if [ ! -d include/asm-$(SRCARCH) ]; then           \
1022                                mkdir -p include/asm-$(SRCARCH);           \
1023                        fi;                                                \
1024                        ln -fsn asm-$(SRCARCH) $@;                         \
1025        fi
1026endef
1027
1028include/asm: FORCE
1029        $(Q)$(check-symlink)
1030        $(Q)$(create-symlink)
1031
1032# Generate some files
1033# ---------------------------------------------------------------------------
1034
1035# KERNELRELEASE can change from a few different places, meaning version.h
1036# needs to be updated, so this check is forced on all builds
1037
1038uts_len := 64
1039define filechk_utsrelease.h
1040        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1041          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1042          exit 1;                                                         \
1043        fi;                                                               \
1044        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1045endef
1046
1047define filechk_version.h
1048        (echo \#define LINUX_VERSION_CODE $(shell                             \
1049        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1050        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1051endef
1052
1053include/linux/version.h: $(srctree)/Makefile FORCE
1054        $(call filechk,version.h)
1055
1056include/linux/utsrelease.h: include/config/kernel.release FORCE
1057        $(call filechk,utsrelease.h)
1058
1059PHONY += headerdep
1060headerdep:
1061        $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1062
1063# ---------------------------------------------------------------------------
1064
1065PHONY += depend dep
1066depend dep:
1067        @echo '*** Warning: make $@ is unnecessary now.'
1068
1069# ---------------------------------------------------------------------------
1070# Firmware install
1071INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1072export INSTALL_FW_PATH
1073
1074PHONY += firmware_install
1075firmware_install: FORCE
1076        @mkdir -p $(objtree)/firmware
1077        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1078
1079# ---------------------------------------------------------------------------
1080# Kernel headers
1081
1082#Default location for installed headers
1083export INSTALL_HDR_PATH = $(objtree)/usr
1084
1085hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1086# Find out where the Kbuild file is located to support
1087# arch/$(ARCH)/include/asm
1088hdr-dir = $(strip                                                         \
1089          $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1090               arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1091
1092# If we do an all arch process set dst to asm-$(hdr-arch)
1093hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1094
1095PHONY += __headers
1096__headers: include/linux/version.h scripts_basic FORCE
1097        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1098
1099PHONY += headers_install_all
1100headers_install_all:
1101        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1102
1103PHONY += headers_install
1104headers_install: __headers
1105        $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1106        $(error Headers not exportable for the $(SRCARCH) architecture))
1107        $(Q)$(MAKE) $(hdr-inst)=include
1108        $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1109
1110PHONY += headers_check_all
1111headers_check_all: headers_install_all
1112        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1113
1114PHONY += headers_check
1115headers_check: headers_install
1116        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1117        $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1118
1119# ---------------------------------------------------------------------------
1120# Modules
1121
1122ifdef CONFIG_MODULES
1123
1124# By default, build modules as well
1125
1126all: modules
1127
1128#       Build modules
1129#
1130#       A module can be listed more than once in obj-m resulting in
1131#       duplicate lines in modules.order files.  Those are removed
1132#       using awk while concatenating to the final file.
1133
1134PHONY += modules
1135modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1136        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1137        @$(kecho) '  Building modules, stage 2.';
1138        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1139        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1140
1141
1142# Target to prepare building external modules
1143PHONY += modules_prepare
1144modules_prepare: prepare scripts
1145
1146# Target to install modules
1147PHONY += modules_install
1148modules_install: _modinst_ _modinst_post
1149
1150PHONY += _modinst_
1151_modinst_:
1152        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1153                echo "Warning: you may need to install module-init-tools"; \
1154                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1155                sleep 1; \
1156        fi
1157        @rm -rf $(MODLIB)/kernel
1158        @rm -f $(MODLIB)/source
1159        @mkdir -p $(MODLIB)/kernel
1160        @ln -s $(srctree) $(MODLIB)/source
1161        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1162                rm -f $(MODLIB)/build ; \
1163                ln -s $(objtree) $(MODLIB)/build ; \
1164        fi
1165        @cp -f $(objtree)/modules.order $(MODLIB)/
1166        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1167
1168# This depmod is only for convenience to give the initial
1169# boot a modules.dep even before / is mounted read-write.  However the
1170# boot script depmod is the master version.
1171PHONY += _modinst_post
1172_modinst_post: _modinst_
1173        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1174        $(call cmd,depmod)
1175
1176else # CONFIG_MODULES
1177
1178# Modules not configured
1179# ---------------------------------------------------------------------------
1180
1181modules modules_install: FORCE
1182        @echo
1183        @echo "The present kernel configuration has modules disabled."
1184        @echo "Type 'make config' and enable loadable module support."
1185        @echo "Then build a kernel with module support enabled."
1186        @echo
1187        @exit 1
1188
1189endif # CONFIG_MODULES
1190
1191###
1192# Cleaning is done on three levels.
1193# make clean     Delete most generated files
1194#                Leave enough to build external modules
1195# make mrproper  Delete the current configuration, and all generated files
1196# make distclean Remove editor backup files, patch leftover files and the like
1197
1198# Directories & files removed with 'make clean'
1199CLEAN_DIRS  += $(MODVERDIR)
1200CLEAN_FILES +=  vmlinux System.map \
1201                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1202
1203# Directories & files removed with 'make mrproper'
1204MRPROPER_DIRS  += include/config include2 usr/include include/generated
1205MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1206                  include/linux/autoconf.h include/linux/version.h      \
1207                  include/linux/utsrelease.h                            \
1208                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1209                  Module.symvers Module.markers tags TAGS cscope*
1210
1211# clean - Delete most, but leave enough to build external modules
1212#
1213clean: rm-dirs  := $(CLEAN_DIRS)
1214clean: rm-files := $(CLEAN_FILES)
1215clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1216
1217PHONY += $(clean-dirs) clean archclean
1218$(clean-dirs):
1219        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1220
1221clean: archclean $(clean-dirs)
1222        $(call cmd,rmdirs)
1223        $(call cmd,rmfiles)
1224        @find . $(RCS_FIND_IGNORE) \
1225                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1226                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1227                -o -name '*.symtypes' -o -name 'modules.order' \
1228                -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1229                -type f -print | xargs rm -f
1230
1231# mrproper - Delete all generated files, including .config
1232#
1233mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1234mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1235mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1236
1237PHONY += $(mrproper-dirs) mrproper archmrproper
1238$(mrproper-dirs):
1239        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1240
1241mrproper: clean archmrproper $(mrproper-dirs)
1242        $(call cmd,rmdirs)
1243        $(call cmd,rmfiles)
1244
1245# distclean
1246#
1247PHONY += distclean
1248
1249distclean: mrproper
1250        @find $(srctree) $(RCS_FIND_IGNORE) \
1251                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1252                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1253                -o -name '.*.rej' -o -size 0 \
1254                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1255                -type f -print | xargs rm -f
1256
1257
1258# Packaging of the kernel to various formats
1259# ---------------------------------------------------------------------------
1260# rpm target kept for backward compatibility
1261package-dir     := $(srctree)/scripts/package
1262
1263%pkg: include/config/kernel.release FORCE
1264        $(Q)$(MAKE) $(build)=$(package-dir) $@
1265rpm: include/config/kernel.release FORCE
1266        $(Q)$(MAKE) $(build)=$(package-dir) $@
1267
1268
1269# Brief documentation of the typical targets used
1270# ---------------------------------------------------------------------------
1271
1272boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1273boards := $(notdir $(boards))
1274board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1275board-dirs := $(sort $(notdir $(board-dirs:/=)))
1276
1277help:
1278        @echo  'Cleaning targets:'
1279        @echo  '  clean           - Remove most generated files but keep the config and'
1280        @echo  '                    enough build support to build external modules'
1281        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1282        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1283        @echo  ''
1284        @echo  'Configuration targets:'
1285        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1286        @echo  ''
1287        @echo  'Other generic targets:'
1288        @echo  '  all             - Build all targets marked with [*]'
1289        @echo  '* vmlinux         - Build the bare kernel'
1290        @echo  '* modules         - Build all modules'
1291        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1292        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1293        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1294        @echo  '  dir/            - Build all files in dir and below'
1295        @echo  '  dir/file.[ois]  - Build specified target only'
1296        @echo  '  dir/file.ko     - Build module including final link'
1297        @echo  '  modules_prepare - Set up for building external modules'
1298        @echo  '  tags/TAGS       - Generate tags file for editors'
1299        @echo  '  cscope          - Generate cscope index'
1300        @echo  '  kernelrelease   - Output the release version string'
1301        @echo  '  kernelversion   - Output the version stored in Makefile'
1302        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1303         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1304         echo  ''
1305        @echo  'Static analysers'
1306        @echo  '  checkstack      - Generate a list of stack hogs'
1307        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1308        @echo  '  versioncheck    - Sanity check on version.h usage'
1309        @echo  '  includecheck    - Check for duplicate included header files'
1310        @echo  '  export_report   - List the usages of all exported symbols'
1311        @echo  '  headers_check   - Sanity check on exported headers'
1312        @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1313         echo  ''
1314        @echo  'Kernel packaging:'
1315        @$(MAKE) $(build)=$(package-dir) help
1316        @echo  ''
1317        @echo  'Documentation targets:'
1318        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1319        @echo  ''
1320        @echo  'Architecture specific targets ($(SRCARCH)):'
1321        @$(if $(archhelp),$(archhelp),\
1322                echo '  No architecture specific help defined for $(SRCARCH)')
1323        @echo  ''
1324        @$(if $(boards), \
1325                $(foreach b, $(boards), \
1326                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1327                echo '')
1328        @$(if $(board-dirs), \
1329                $(foreach b, $(board-dirs), \
1330                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1331                printf "  %-16s - Show all of the above\\n" help-boards; \
1332                echo '')
1333
1334        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1335        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1336        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1337        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1338        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1339        @echo  ''
1340        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1341        @echo  'For further info see the ./README file'
1342
1343
1344help-board-dirs := $(addprefix help-,$(board-dirs))
1345
1346help-boards: $(help-board-dirs)
1347
1348boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1349
1350$(help-board-dirs): help-%:
1351        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1352        @$(if $(boards-per-dir), \
1353                $(foreach b, $(boards-per-dir), \
1354                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1355                echo '')
1356
1357
1358# Documentation targets
1359# ---------------------------------------------------------------------------
1360%docs: scripts_basic FORCE
1361        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1362
1363else # KBUILD_EXTMOD
1364
1365###
1366# External module support.
1367# When building external modules the kernel used as basis is considered
1368# read-only, and no consistency checks are made and the make
1369# system is not used on the basis kernel. If updates are required
1370# in the basis kernel ordinary make commands (without M=...) must
1371# be used.
1372#
1373# The following are the only valid targets when building external
1374# modules.
1375# make M=dir clean     Delete all automatically generated files
1376# make M=dir modules   Make all modules in specified dir
1377# make M=dir           Same as 'make M=dir modules'
1378# make M=dir modules_install
1379#                      Install the modules built in the module directory
1380#                      Assumes install directory is already created
1381
1382# We are always building modules
1383KBUILD_MODULES := 1
1384PHONY += crmodverdir
1385crmodverdir:
1386        $(cmd_crmodverdir)
1387
1388PHONY += $(objtree)/Module.symvers
1389$(objtree)/Module.symvers:
1390        @test -e $(objtree)/Module.symvers || ( \
1391        echo; \
1392        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1393        echo "           is missing; modules will have no dependencies and modversions."; \
1394        echo )
1395
1396module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1397PHONY += $(module-dirs) modules
1398$(module-dirs): crmodverdir $(objtree)/Module.symvers
1399        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1400
1401modules: $(module-dirs)
1402        @$(kecho) '  Building modules, stage 2.';
1403        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1404
1405PHONY += modules_install
1406modules_install: _emodinst_ _emodinst_post
1407
1408install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1409PHONY += _emodinst_
1410_emodinst_:
1411        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1412        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1413
1414PHONY += _emodinst_post
1415_emodinst_post: _emodinst_
1416        $(call cmd,depmod)
1417
1418clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1419
1420PHONY += $(clean-dirs) clean
1421$(clean-dirs):
1422        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1423
1424clean:  rm-dirs := $(MODVERDIR)
1425clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1426                   $(KBUILD_EXTMOD)/Module.markers \
1427                   $(KBUILD_EXTMOD)/modules.order
1428clean: $(clean-dirs)
1429        $(call cmd,rmdirs)
1430        $(call cmd,rmfiles)
1431        @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1432                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1433                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1434                -type f -print | xargs rm -f
1435
1436help:
1437        @echo  '  Building external modules.'
1438        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1439        @echo  ''
1440        @echo  '  modules         - default target, build the module(s)'
1441        @echo  '  modules_install - install the module'
1442        @echo  '  clean           - remove generated files in module directory only'
1443        @echo  ''
1444
1445# Dummies...
1446PHONY += prepare scripts
1447prepare: ;
1448scripts: ;
1449endif # KBUILD_EXTMOD
1450
1451# Generate tags for editors
1452# ---------------------------------------------------------------------------
1453quiet_cmd_tags = GEN     $@
1454      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1455
1456tags TAGS cscope: FORCE
1457        $(call cmd,tags)
1458
1459# Scripts to check various things for consistency
1460# ---------------------------------------------------------------------------
1461
1462includecheck:
1463        find * $(RCS_FIND_IGNORE) \
1464                -name '*.[hcS]' -type f -print | sort \
1465                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1466
1467versioncheck:
1468        find * $(RCS_FIND_IGNORE) \
1469                -name '*.[hcS]' -type f -print | sort \
1470                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1471
1472namespacecheck:
1473        $(PERL) $(srctree)/scripts/namespace.pl
1474
1475export_report:
1476        $(PERL) $(srctree)/scripts/export_report.pl
1477
1478endif #ifeq ($(config-targets),1)
1479endif #ifeq ($(mixed-targets),1)
1480
1481PHONY += checkstack kernelrelease kernelversion
1482
1483# UML needs a little special treatment here.  It wants to use the host
1484# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1485# else wants $(ARCH), including people doing cross-builds, which means
1486# that $(SUBARCH) doesn't work here.
1487ifeq ($(ARCH), um)
1488CHECKSTACK_ARCH := $(SUBARCH)
1489else
1490CHECKSTACK_ARCH := $(ARCH)
1491endif
1492checkstack:
1493        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1494        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1495
1496kernelrelease:
1497        $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1498        $(error kernelrelease not valid - run 'make prepare' to update it))
1499kernelversion:
1500        @echo $(KERNELVERSION)
1501
1502# Single targets
1503# ---------------------------------------------------------------------------
1504# Single targets are compatible with:
1505# - build with mixed source and output
1506# - build with separate output dir 'make O=...'
1507# - external modules
1508#
1509#  target-dir => where to store outputfile
1510#  build-dir  => directory in kernel source tree to use
1511
1512ifeq ($(KBUILD_EXTMOD),)
1513        build-dir  = $(patsubst %/,%,$(dir $@))
1514        target-dir = $(dir $@)
1515else
1516        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1517        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1518        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1519endif
1520
1521%.s: %.c prepare scripts FORCE
1522        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523%.i: %.c prepare scripts FORCE
1524        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525%.o: %.c prepare scripts FORCE
1526        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527%.lst: %.c prepare scripts FORCE
1528        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529%.s: %.S prepare scripts FORCE
1530        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531%.o: %.S prepare scripts FORCE
1532        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533%.symtypes: %.c prepare scripts FORCE
1534        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535
1536# Modules
1537/: prepare scripts FORCE
1538        $(cmd_crmodverdir)
1539        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1540        $(build)=$(build-dir)
1541%/: prepare scripts FORCE
1542        $(cmd_crmodverdir)
1543        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1544        $(build)=$(build-dir)
1545%.ko: prepare scripts FORCE
1546        $(cmd_crmodverdir)
1547        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1548        $(build)=$(build-dir) $(@:.ko=.o)
1549        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1550
1551# FIXME Should go into a make.lib or something 
1552# ===========================================================================
1553
1554quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1555      cmd_rmdirs = rm -rf $(rm-dirs)
1556
1557quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1558      cmd_rmfiles = rm -f $(rm-files)
1559
1560# Run depmod only if we have System.map and depmod is executable
1561quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1562      cmd_depmod = \
1563        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1564                $(DEPMOD) -ae -F System.map                                     \
1565                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1566                $(KERNELRELEASE);                                               \
1567        fi
1568
1569# Create temporary dir for module support files
1570# clean it up only when building all modules
1571cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1572                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1573
1574a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1575          $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1576          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1577
1578quiet_cmd_as_o_S = AS      $@
1579cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1580
1581# read all saved command lines
1582
1583targets := $(wildcard $(sort $(targets)))
1584cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1585
1586ifneq ($(cmd_files),)
1587  $(cmd_files): ;       # Do not try to update included dependency files
1588  include $(cmd_files)
1589endif
1590
1591# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1592# Usage:
1593# $(Q)$(MAKE) $(clean)=dir
1594clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1595
1596endif   # skip-makefile
1597
1598PHONY += FORCE
1599FORCE:
1600
1601# Declare the contents of the .PHONY variable as phony.  We keep that
1602# information in a variable so we can use it in if_changed and friends.
1603.PHONY: $(PHONY)
1604