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