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   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 32
   4EXTRAVERSION =
   5NAME = Man-Eating Seals of Antiquity
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# We are using a recursive build, so we need to do a little thinking
  20# to get the ordering right.
  21#
  22# Most importantly: sub-Makefiles should only ever modify files in
  23# their own directory. If in some directory we have a dependency on
  24# a file in another dir (which doesn't happen often, but it's often
  25# unavoidable when linking the built-in.o targets which finally
  26# turn into vmlinux), we will call a sub make in that other dir, and
  27# after that we are sure that everything which is in that other dir
  28# is now up to date.
  29#
  30# The only cases where we need to modify files which have global
  31# effects are thus separated out and done before the recursive
  32# descending is started. They are now explicitly listed as the
  33# prepare rule.
  34
  35# To put more focus on warnings, be less verbose as default
  36# Use 'make V=1' to see the full commands
  37
  38ifeq ("$(origin V)", "command line")
  39  KBUILD_VERBOSE = $(V)
  40endif
  41ifndef KBUILD_VERBOSE
  42  KBUILD_VERBOSE = 0
  43endif
  44
  45# Call a source code checker (by default, "sparse") as part of the
  46# C compilation.
  47#
  48# Use 'make C=1' to enable checking of only re-compiled files.
  49# Use 'make C=2' to enable checking of *all* source files, regardless
  50# of whether they are re-compiled or not.
  51#
  52# See the file "Documentation/sparse.txt" for more details, including
  53# where to get the "sparse" utility.
  54
  55ifeq ("$(origin C)", "command line")
  56  KBUILD_CHECKSRC = $(C)
  57endif
  58ifndef KBUILD_CHECKSRC
  59  KBUILD_CHECKSRC = 0
  60endif
  61
  62# Use make M=dir to specify directory of external module to build
  63# Old syntax make ... SUBDIRS=$PWD is still supported
  64# Setting the environment variable KBUILD_EXTMOD take precedence
  65ifdef SUBDIRS
  66  KBUILD_EXTMOD ?= $(SUBDIRS)
  67endif
  68
  69ifeq ("$(origin M)", "command line")
  70  KBUILD_EXTMOD := $(M)
  71endif
  72
  73# kbuild supports saving output files in a separate directory.
  74# To locate output files in a separate directory two syntaxes are supported.
  75# In both cases the working directory must be the root of the kernel src.
  76# 1) O=
  77# Use "make O=dir/to/store/output/files/"
  78#
  79# 2) Set KBUILD_OUTPUT
  80# Set the environment variable KBUILD_OUTPUT to point to the directory
  81# where the output files shall be placed.
  82# export KBUILD_OUTPUT=dir/to/store/output/files/
  83# make
  84#
  85# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  86# variable.
  87
  88
  89# KBUILD_SRC is set on invocation of make in OBJ directory
  90# KBUILD_SRC is not intended to be used by the regular user (for now)
  91ifeq ($(KBUILD_SRC),)
  92
  93# OK, Make called in directory where kernel src resides
  94# Do we want to locate output files in a separate directory?
  95ifeq ("$(origin O)", "command line")
  96  KBUILD_OUTPUT := $(O)
  97endif
  98
  99# That's our default target when none is given on the command line
 100PHONY := _all
 101_all:
 102
 103# Cancel implicit rules on top Makefile
 104$(CURDIR)/Makefile Makefile: ;
 105
 106ifneq ($(KBUILD_OUTPUT),)
 107# Invoke a second make in the output directory, passing relevant variables
 108# check that the output directory actually exists
 109saved-output := $(KBUILD_OUTPUT)
 110KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 111$(if $(KBUILD_OUTPUT),, \
 112     $(error output directory "$(saved-output)" does not exist))
 113
 114PHONY += $(MAKECMDGOALS) sub-make
 115
 116$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 117        $(Q)@:
 118
 119sub-make: FORCE
 120        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 121        KBUILD_SRC=$(CURDIR) \
 122        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 123        $(filter-out _all sub-make,$(MAKECMDGOALS))
 124
 125# Leave processing to above invocation of make
 126skip-makefile := 1
 127endif # ifneq ($(KBUILD_OUTPUT),)
 128endif # ifeq ($(KBUILD_SRC),)
 129
 130# We process the rest of the Makefile if this is the final invocation of make
 131ifeq ($(skip-makefile),)
 132
 133# If building an external module we do not care about the all: rule
 134# but instead _all depend on modules
 135PHONY += all
 136ifeq ($(KBUILD_EXTMOD),)
 137_all: all
 138else
 139_all: modules
 140endif
 141
 142srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 143objtree         := $(CURDIR)
 144src             := $(srctree)
 145obj             := $(objtree)
 146
 147VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 148
 149export srctree objtree VPATH
 150
 151
 152# SUBARCH tells the usermode build what the underlying arch is.  That is set
 153# first, and if a usermode build is happening, the "ARCH=um" on the command
 154# line overrides the setting of ARCH below.  If a native build is happening,
 155# then ARCH is assigned, getting whatever value it gets normally, and 
 156# SUBARCH is subsequently ignored.
 157
 158SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 159                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 160                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 161                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 162                                  -e s/sh[234].*/sh/ )
 163
 164# Cross compiling and selecting different set of gcc/bin-utils
 165# ---------------------------------------------------------------------------
 166#
 167# When performing cross compilation for other architectures ARCH shall be set
 168# to the target architecture. (See arch/* for the possibilities).
 169# ARCH can be set during invocation of make:
 170# make ARCH=ia64
 171# Another way is to have ARCH set in the environment.
 172# The default ARCH is the host where make is executed.
 173
 174# CROSS_COMPILE specify the prefix used for all executables used
 175# during compilation. Only gcc and related bin-utils executables
 176# are prefixed with $(CROSS_COMPILE).
 177# CROSS_COMPILE can be set on the command line
 178# make CROSS_COMPILE=ia64-linux-
 179# Alternatively CROSS_COMPILE can be set in the environment.
 180# Default value for CROSS_COMPILE is not to prefix executables
 181# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 182export KBUILD_BUILDHOST := $(SUBARCH)
 183ARCH            ?= $(SUBARCH)
 184CROSS_COMPILE   ?=
 185
 186# Architecture as present in compile.h
 187UTS_MACHINE     := $(ARCH)
 188SRCARCH         := $(ARCH)
 189
 190# Additional ARCH settings for x86
 191ifeq ($(ARCH),i386)
 192        SRCARCH := x86
 193endif
 194ifeq ($(ARCH),x86_64)
 195        SRCARCH := x86
 196endif
 197
 198# Additional ARCH settings for sparc
 199ifeq ($(ARCH),sparc64)
 200       SRCARCH := sparc
 201endif
 202
 203# Additional ARCH settings for sh
 204ifeq ($(ARCH),sh64)
 205       SRCARCH := sh
 206endif
 207
 208# Where to locate arch specific headers
 209hdr-arch  := $(SRCARCH)
 210
 211ifeq ($(ARCH),m68knommu)
 212       hdr-arch  := m68k
 213endif
 214
 215KCONFIG_CONFIG  ?= .config
 216
 217# SHELL used by kbuild
 218CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 219          else if [ -x /bin/bash ]; then echo /bin/bash; \
 220          else echo sh; fi ; fi)
 221
 222HOSTCC       = gcc
 223HOSTCXX      = g++
 224HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 225HOSTCXXFLAGS = -O2
 226
 227# Decide whether to build built-in, modular, or both.
 228# Normally, just do built-in.
 229
 230KBUILD_MODULES :=
 231KBUILD_BUILTIN := 1
 232
 233#       If we have only "make modules", don't compile built-in objects.
 234#       When we're building modules with modversions, we need to consider
 235#       the built-in objects during the descend as well, in order to
 236#       make sure the checksums are up to date before we record them.
 237
 238ifeq ($(MAKECMDGOALS),modules)
 239  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 240endif
 241
 242#       If we have "make <whatever> modules", compile modules
 243#       in addition to whatever we do anyway.
 244#       Just "make" or "make all" shall build modules as well
 245
 246ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 247  KBUILD_MODULES := 1
 248endif
 249
 250ifeq ($(MAKECMDGOALS),)
 251  KBUILD_MODULES := 1
 252endif
 253
 254export KBUILD_MODULES KBUILD_BUILTIN
 255export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 256
 257# Beautify output
 258# ---------------------------------------------------------------------------
 259#
 260# Normally, we echo the whole command before executing it. By making
 261# that echo $($(quiet)$(cmd)), we now have the possibility to set
 262# $(quiet) to choose other forms of output instead, e.g.
 263#
 264#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 265#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 266#
 267# If $(quiet) is empty, the whole command will be printed.
 268# If it is set to "quiet_", only the short version will be printed. 
 269# If it is set to "silent_", nothing will be printed at all, since
 270# the variable $(silent_cmd_cc_o_c) doesn't exist.
 271#
 272# A simple variant is to prefix commands with $(Q) - that's useful
 273# for commands that shall be hidden in non-verbose mode.
 274#
 275#       $(Q)ln $@ :<
 276#
 277# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 278# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 279
 280ifeq ($(KBUILD_VERBOSE),1)
 281  quiet =
 282  Q =
 283else
 284  quiet=quiet_
 285  Q = @
 286endif
 287
 288# If the user is running make -s (silent mode), suppress echoing of
 289# commands
 290
 291ifneq ($(findstring s,$(MAKEFLAGS)),)
 292  quiet=silent_
 293endif
 294
 295export quiet Q KBUILD_VERBOSE
 296
 297
 298# Look for make include files relative to root of kernel src
 299MAKEFLAGS += --include-dir=$(srctree)
 300
 301# We need some generic definitions (do not try to remake the file).
 302$(srctree)/scripts/Kbuild.include: ;
 303include $(srctree)/scripts/Kbuild.include
 304
 305# Make variables (CC, etc...)
 306
 307AS              = $(CROSS_COMPILE)as
 308LD              = $(CROSS_COMPILE)ld
 309CC              = $(CROSS_COMPILE)gcc
 310CPP             = $(CC) -E
 311AR              = $(CROSS_COMPILE)ar
 312NM              = $(CROSS_COMPILE)nm
 313STRIP           = $(CROSS_COMPILE)strip
 314OBJCOPY         = $(CROSS_COMPILE)objcopy
 315OBJDUMP         = $(CROSS_COMPILE)objdump
 316AWK             = awk
 317GENKSYMS        = scripts/genksyms/genksyms
 318INSTALLKERNEL  := installkernel
 319DEPMOD          = /sbin/depmod
 320KALLSYMS        = scripts/kallsyms
 321PERL            = perl
 322CHECK           = sparse
 323
 324CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 325                  -Wbitwise -Wno-return-void $(CF)
 326MODFLAGS        = -DMODULE
 327CFLAGS_MODULE   = $(MODFLAGS)
 328AFLAGS_MODULE   = $(MODFLAGS)
 329LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 330CFLAGS_KERNEL   =
 331AFLAGS_KERNEL   =
 332CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 333
 334
 335# Use LINUXINCLUDE when you must reference the include/ directory.
 336# Needed to be compatible with the O= option
 337LINUXINCLUDE    := -Iinclude \
 338                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 339                   -I$(srctree)/arch/$(hdr-arch)/include               \
 340                   -include include/linux/autoconf.h
 341
 342KBUILD_CPPFLAGS := -D__KERNEL__
 343
 344KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 345                   -fno-strict-aliasing -fno-common \
 346                   -Werror-implicit-function-declaration \
 347                   -Wno-format-security \
 348                   -fno-delete-null-pointer-checks
 349KBUILD_AFLAGS   := -D__ASSEMBLY__
 350
 351# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 352KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 353KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 354
 355export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 356export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 357export CPP AR NM STRIP OBJCOPY OBJDUMP
 358export MAKE AWK GENKSYMS INSTALLKERNEL 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 CFLAGS_GCOV
 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
 536ifndef CONFIG_CC_STACKPROTECTOR
 537KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 538endif
 539
 540ifdef CONFIG_FRAME_POINTER
 541KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 542else
 543KBUILD_CFLAGS   += -fomit-frame-pointer
 544endif
 545
 546ifdef CONFIG_DEBUG_INFO
 547KBUILD_CFLAGS   += -g
 548KBUILD_AFLAGS   += -gdwarf-2
 549endif
 550
 551ifdef CONFIG_FUNCTION_TRACER
 552KBUILD_CFLAGS   += -pg
 553endif
 554
 555# We trigger additional mismatches with less inlining
 556ifdef CONFIG_DEBUG_SECTION_MISMATCH
 557KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 558endif
 559
 560# arch Makefile may override CC so keep this after arch Makefile is included
 561NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 562CHECKFLAGS     += $(NOSTDINC_FLAGS)
 563
 564# warn about C99 declaration after statement
 565KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 566
 567# disable pointer signed / unsigned warnings in gcc 4.0
 568KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 569
 570# disable invalid "can't wrap" optimizations for signed / pointers
 571KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 572
 573# revert to pre-gcc-4.4 behaviour of .eh_frame
 574KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 575
 576# conserve stack if available
 577KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 578
 579# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 580# But warn user when we do so
 581warn-assign = \
 582$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 583
 584ifneq ($(KCPPFLAGS),)
 585        $(call warn-assign,CPPFLAGS)
 586        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 587endif
 588ifneq ($(KAFLAGS),)
 589        $(call warn-assign,AFLAGS)
 590        KBUILD_AFLAGS += $(KAFLAGS)
 591endif
 592ifneq ($(KCFLAGS),)
 593        $(call warn-assign,CFLAGS)
 594        KBUILD_CFLAGS += $(KCFLAGS)
 595endif
 596
 597# Use --build-id when available.
 598LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 599                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 600LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 601LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 602
 603ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 604LDFLAGS_vmlinux += $(call ld-option, -X,)
 605endif
 606
 607# Default kernel image to build when no specific target is given.
 608# KBUILD_IMAGE may be overruled on the command line or
 609# set in the environment
 610# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 611# this default value
 612export KBUILD_IMAGE ?= vmlinux
 613
 614#
 615# INSTALL_PATH specifies where to place the updated kernel and system map
 616# images. Default is /boot, but you can set it to other values
 617export  INSTALL_PATH ?= /boot
 618
 619#
 620# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 621# relocations required by build roots.  This is not defined in the
 622# makefile but the argument can be passed to make if needed.
 623#
 624
 625MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 626export MODLIB
 627
 628#
 629#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 630#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 631#  the default option --strip-debug will be used.  Otherwise,
 632#  INSTALL_MOD_STRIP will used as the options to the strip command.
 633
 634ifdef INSTALL_MOD_STRIP
 635ifeq ($(INSTALL_MOD_STRIP),1)
 636mod_strip_cmd = $(STRIP) --strip-debug
 637else
 638mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 639endif # INSTALL_MOD_STRIP=1
 640else
 641mod_strip_cmd = true
 642endif # INSTALL_MOD_STRIP
 643export mod_strip_cmd
 644
 645
 646ifeq ($(KBUILD_EXTMOD),)
 647core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 648
 649vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 650                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 651                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 652
 653vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 654                     $(init-n) $(init-) \
 655                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 656                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 657
 658init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 659core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 660drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 661net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 662libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 663libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 664libs-y          := $(libs-y1) $(libs-y2)
 665
 666# Build vmlinux
 667# ---------------------------------------------------------------------------
 668# vmlinux is built from the objects selected by $(vmlinux-init) and
 669# $(vmlinux-main). Most are built-in.o files from top-level directories
 670# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 671# Ordering when linking is important, and $(vmlinux-init) must be first.
 672#
 673# vmlinux
 674#   ^
 675#   |
 676#   +-< $(vmlinux-init)
 677#   |   +--< init/version.o + more
 678#   |
 679#   +--< $(vmlinux-main)
 680#   |    +--< driver/built-in.o mm/built-in.o + more
 681#   |
 682#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 683#
 684# vmlinux version (uname -v) cannot be updated during normal
 685# descending-into-subdirs phase since we do not yet know if we need to
 686# update vmlinux.
 687# Therefore this step is delayed until just before final link of vmlinux -
 688# except in the kallsyms case where it is done just before adding the
 689# symbols to the kernel.
 690#
 691# System.map is generated to document addresses of all kernel symbols
 692
 693vmlinux-init := $(head-y) $(init-y)
 694vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 695vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 696vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 697export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 698
 699# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 700# May be overridden by arch/$(ARCH)/Makefile
 701quiet_cmd_vmlinux__ ?= LD      $@
 702      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 703      -T $(vmlinux-lds) $(vmlinux-init)                          \
 704      --start-group $(vmlinux-main) --end-group                  \
 705      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 706
 707# Generate new vmlinux version
 708quiet_cmd_vmlinux_version = GEN     .version
 709      cmd_vmlinux_version = set -e;                     \
 710        if [ ! -r .version ]; then                      \
 711          rm -f .version;                               \
 712          echo 1 >.version;                             \
 713        else                                            \
 714          mv .version .old_version;                     \
 715          expr 0$$(cat .old_version) + 1 >.version;     \
 716        fi;                                             \
 717        $(MAKE) $(build)=init
 718
 719# Generate System.map
 720quiet_cmd_sysmap = SYSMAP
 721      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 722
 723# Link of vmlinux
 724# If CONFIG_KALLSYMS is set .version is already updated
 725# Generate System.map and verify that the content is consistent
 726# Use + in front of the vmlinux_version rule to silent warning with make -j2
 727# First command is ':' to allow us to use + in front of the rule
 728define rule_vmlinux__
 729        :
 730        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 731
 732        $(call cmd,vmlinux__)
 733        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 734
 735        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 736          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 737        $(cmd_sysmap) $@ System.map;                                         \
 738        if [ $$? -ne 0 ]; then                                               \
 739                rm -f $@;                                                    \
 740                /bin/false;                                                  \
 741        fi;
 742        $(verify_kallsyms)
 743endef
 744
 745
 746ifdef CONFIG_KALLSYMS
 747# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 748# It's a three stage process:
 749# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 750#   empty
 751#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 752#   the right size - vmlinux version (uname -v) is updated during this step
 753# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 754#   but due to the added section, some addresses have shifted.
 755#   From here, we generate a correct .tmp_kallsyms2.o
 756# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 757# o Verify that the System.map from vmlinux matches the map from
 758#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 759# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 760#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 761#   temporary bypass to allow the kernel to be built while the
 762#   maintainers work out what went wrong with kallsyms.
 763
 764ifdef CONFIG_KALLSYMS_EXTRA_PASS
 765last_kallsyms := 3
 766else
 767last_kallsyms := 2
 768endif
 769
 770kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 771
 772define verify_kallsyms
 773        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 774          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 775          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 776        $(Q)cmp -s System.map .tmp_System.map ||                             \
 777                (echo Inconsistent kallsyms data;                            \
 778                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 779                 rm .tmp_kallsyms* ; /bin/false )
 780endef
 781
 782# Update vmlinux version before link
 783# Use + in front of this rule to silent warning about make -j1
 784# First command is ':' to allow us to use + in front of this rule
 785cmd_ksym_ld = $(cmd_vmlinux__)
 786define rule_ksym_ld
 787        : 
 788        +$(call cmd,vmlinux_version)
 789        $(call cmd,vmlinux__)
 790        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 791endef
 792
 793# Generate .S file with all kernel symbols
 794quiet_cmd_kallsyms = KSYM    $@
 795      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 796                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 797
 798.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 799        $(call if_changed_dep,as_o_S)
 800
 801.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 802        $(call cmd,kallsyms)
 803
 804# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 805.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 806        $(call if_changed_rule,ksym_ld)
 807
 808.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 809        $(call if_changed,vmlinux__)
 810
 811.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 812        $(call if_changed,vmlinux__)
 813
 814# Needs to visit scripts/ before $(KALLSYMS) can be used.
 815$(KALLSYMS): scripts ;
 816
 817# Generate some data for debugging strange kallsyms problems
 818debug_kallsyms: .tmp_map$(last_kallsyms)
 819
 820.tmp_map%: .tmp_vmlinux% FORCE
 821        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 822
 823.tmp_map3: .tmp_map2
 824
 825.tmp_map2: .tmp_map1
 826
 827endif # ifdef CONFIG_KALLSYMS
 828
 829# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 830# relevant sections renamed as per the linker script.
 831quiet_cmd_vmlinux-modpost = LD      $@
 832      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 833         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 834         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 835define rule_vmlinux-modpost
 836        :
 837        +$(call cmd,vmlinux-modpost)
 838        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 839        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 840endef
 841
 842# vmlinux image - including updated kernel symbols
 843vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 844ifdef CONFIG_HEADERS_CHECK
 845        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 846endif
 847ifdef CONFIG_SAMPLES
 848        $(Q)$(MAKE) $(build)=samples
 849endif
 850ifdef CONFIG_BUILD_DOCSRC
 851        $(Q)$(MAKE) $(build)=Documentation
 852endif
 853        $(call vmlinux-modpost)
 854        $(call if_changed_rule,vmlinux__)
 855        $(Q)rm -f .old_version
 856
 857# build vmlinux.o first to catch section mismatch errors early
 858ifdef CONFIG_KALLSYMS
 859.tmp_vmlinux1: vmlinux.o
 860endif
 861
 862modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 863vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 864        $(call if_changed_rule,vmlinux-modpost)
 865
 866# The actual objects are generated when descending, 
 867# make sure no implicit rule kicks in
 868$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 869
 870# Handle descending into subdirectories listed in $(vmlinux-dirs)
 871# Preset locale variables to speed up the build process. Limit locale
 872# tweaks to this spot to avoid wrong language settings when running
 873# make menuconfig etc.
 874# Error messages still appears in the original language
 875
 876PHONY += $(vmlinux-dirs)
 877$(vmlinux-dirs): prepare scripts
 878        $(Q)$(MAKE) $(build)=$@
 879
 880# Build the kernel release string
 881#
 882# The KERNELRELEASE value built here is stored in the file
 883# include/config/kernel.release, and is used when executing several
 884# make targets, such as "make install" or "make modules_install."
 885#
 886# The eventual kernel release string consists of the following fields,
 887# shown in a hierarchical format to show how smaller parts are concatenated
 888# to form the larger and final value, with values coming from places like
 889# the Makefile, kernel config options, make command line options and/or
 890# SCM tag information.
 891#
 892#       $(KERNELVERSION)
 893#         $(VERSION)                    eg, 2
 894#         $(PATCHLEVEL)                 eg, 6
 895#         $(SUBLEVEL)                   eg, 18
 896#         $(EXTRAVERSION)               eg, -rc6
 897#       $(localver-full)
 898#         $(localver)
 899#           localversion*               (files without backups, containing '~')
 900#           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 901#         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 902#           ./scripts/setlocalversion   (SCM tag, if one exists)
 903#           $(LOCALVERSION)             (from make command line if provided)
 904#
 905#  Note how the final $(localver-auto) string is included *only* if the
 906# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 907# moment, only git is supported but other SCMs can edit the script
 908# scripts/setlocalversion and add the appropriate checks as needed.
 909
 910pattern = ".*/localversion[^~]*"
 911string  = $(shell cat /dev/null \
 912           `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 913
 914localver = $(subst $(space),, $(string) \
 915                              $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 916
 917# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 918# and if the SCM is know a tag from the SCM is appended.
 919# The appended tag is determined by the SCM used.
 920#
 921# .scmversion is used when generating rpm packages so we do not loose
 922# the version information from the SCM when we do the build of the kernel
 923# from the copied source
 924ifdef CONFIG_LOCALVERSION_AUTO
 925
 926ifeq ($(wildcard .scmversion),)
 927        _localver-auto = $(shell $(CONFIG_SHELL) \
 928                         $(srctree)/scripts/setlocalversion $(srctree))
 929else
 930        _localver-auto = $(shell cat .scmversion 2> /dev/null)
 931endif
 932
 933        localver-auto  = $(LOCALVERSION)$(_localver-auto)
 934endif
 935
 936localver-full = $(localver)$(localver-auto)
 937
 938# Store (new) KERNELRELASE string in include/config/kernel.release
 939kernelrelease = $(KERNELVERSION)$(localver-full)
 940include/config/kernel.release: include/config/auto.conf FORCE
 941        $(Q)rm -f $@
 942        $(Q)echo $(kernelrelease) > $@
 943
 944
 945# Things we need to do before we recursively start building the kernel
 946# or the modules are listed in "prepare".
 947# A multi level approach is used. prepareN is processed before prepareN-1.
 948# archprepare is used in arch Makefiles and when processed asm symlink,
 949# version.h and scripts_basic is processed / created.
 950
 951# Listed in dependency order
 952PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 953
 954# prepare3 is used to check if we are building in a separate output directory,
 955# and if so do:
 956# 1) Check that make has not been executed in the kernel src $(srctree)
 957# 2) Create the include2 directory, used for the second asm symlink
 958prepare3: include/config/kernel.release
 959ifneq ($(KBUILD_SRC),)
 960        @$(kecho) '  Using $(srctree) as source for kernel'
 961        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 962                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 963                echo "  in the '$(srctree)' directory.";\
 964                /bin/false; \
 965        fi;
 966        $(Q)if [ ! -d include2 ]; then                                  \
 967            mkdir -p include2;                                          \
 968            ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
 969        fi
 970endif
 971
 972# prepare2 creates a makefile if using a separate output directory
 973prepare2: prepare3 outputmakefile
 974
 975prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 976                   include/asm include/config/auto.conf
 977        $(cmd_crmodverdir)
 978
 979archprepare: prepare1 scripts_basic
 980
 981prepare0: archprepare FORCE
 982        $(Q)$(MAKE) $(build)=.
 983        $(Q)$(MAKE) $(build)=. missing-syscalls
 984
 985# All the preparing..
 986prepare: prepare0
 987
 988# The asm symlink changes when $(ARCH) changes.
 989# Detect this and ask user to run make mrproper
 990# If asm is a stale symlink (point to dir that does not exist) remove it
 991define check-symlink
 992        set -e;                                                            \
 993        if [ -L include/asm ]; then                                        \
 994                asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
 995                if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
 996                        echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 997                        echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 998                        exit 1;                                            \
 999                fi;                                                        \
1000                test -e $$asmlink || rm include/asm;                       \
1001        elif [ -d include/asm ]; then                                      \
1002                echo "ERROR: $@ is a directory but a symlink was expected";\
1003                exit 1;                                                    \
1004        fi
1005endef
1006
1007# We create the target directory of the symlink if it does
1008# not exist so the test in check-symlink works and we have a
1009# directory for generated filesas used by some architectures.
1010define create-symlink
1011        if [ ! -L include/asm ]; then                                      \
1012                        $(kecho) '  SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1013                        if [ ! -d include/asm-$(SRCARCH) ]; then           \
1014                                mkdir -p include/asm-$(SRCARCH);           \
1015                        fi;                                                \
1016                        ln -fsn asm-$(SRCARCH) $@;                         \
1017        fi
1018endef
1019
1020include/asm: FORCE
1021        $(Q)$(check-symlink)
1022        $(Q)$(create-symlink)
1023
1024# Generate some files
1025# ---------------------------------------------------------------------------
1026
1027# KERNELRELEASE can change from a few different places, meaning version.h
1028# needs to be updated, so this check is forced on all builds
1029
1030uts_len := 64
1031define filechk_utsrelease.h
1032        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1033          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1034          exit 1;                                                         \
1035        fi;                                                               \
1036        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1037endef
1038
1039define filechk_version.h
1040        (echo \#define LINUX_VERSION_CODE $(shell                             \
1041        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1042        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1043endef
1044
1045include/linux/version.h: $(srctree)/Makefile FORCE
1046        $(call filechk,version.h)
1047
1048include/linux/utsrelease.h: include/config/kernel.release FORCE
1049        $(call filechk,utsrelease.h)
1050
1051PHONY += headerdep
1052headerdep:
1053        $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1054
1055# ---------------------------------------------------------------------------
1056
1057PHONY += depend dep
1058depend dep:
1059        @echo '*** Warning: make $@ is unnecessary now.'
1060
1061# ---------------------------------------------------------------------------
1062# Firmware install
1063INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1064export INSTALL_FW_PATH
1065
1066PHONY += firmware_install
1067firmware_install: FORCE
1068        @mkdir -p $(objtree)/firmware
1069        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1070
1071# ---------------------------------------------------------------------------
1072# Kernel headers
1073
1074#Default location for installed headers
1075export INSTALL_HDR_PATH = $(objtree)/usr
1076
1077hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1078# Find out where the Kbuild file is located to support
1079# arch/$(ARCH)/include/asm
1080hdr-dir = $(strip                                                         \
1081          $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1082               arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1083
1084# If we do an all arch process set dst to asm-$(hdr-arch)
1085hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1086
1087PHONY += __headers
1088__headers: include/linux/version.h scripts_basic FORCE
1089        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1090
1091PHONY += headers_install_all
1092headers_install_all:
1093        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1094
1095PHONY += headers_install
1096headers_install: __headers
1097        $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1098        $(error Headers not exportable for the $(SRCARCH) architecture))
1099        $(Q)$(MAKE) $(hdr-inst)=include
1100        $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1101
1102PHONY += headers_check_all
1103headers_check_all: headers_install_all
1104        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1105
1106PHONY += headers_check
1107headers_check: headers_install
1108        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1109        $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1110
1111# ---------------------------------------------------------------------------
1112# Modules
1113
1114ifdef CONFIG_MODULES
1115
1116# By default, build modules as well
1117
1118all: modules
1119
1120#       Build modules
1121#
1122#       A module can be listed more than once in obj-m resulting in
1123#       duplicate lines in modules.order files.  Those are removed
1124#       using awk while concatenating to the final file.
1125
1126PHONY += modules
1127modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1128        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1129        @$(kecho) '  Building modules, stage 2.';
1130        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1131        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1132
1133
1134# Target to prepare building external modules
1135PHONY += modules_prepare
1136modules_prepare: prepare scripts
1137
1138# Target to install modules
1139PHONY += modules_install
1140modules_install: _modinst_ _modinst_post
1141
1142PHONY += _modinst_
1143_modinst_:
1144        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1145                echo "Warning: you may need to install module-init-tools"; \
1146                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1147                sleep 1; \
1148        fi
1149        @rm -rf $(MODLIB)/kernel
1150        @rm -f $(MODLIB)/source
1151        @mkdir -p $(MODLIB)/kernel
1152        @ln -s $(srctree) $(MODLIB)/source
1153        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1154                rm -f $(MODLIB)/build ; \
1155                ln -s $(objtree) $(MODLIB)/build ; \
1156        fi
1157        @cp -f $(objtree)/modules.order $(MODLIB)/
1158        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1159
1160# This depmod is only for convenience to give the initial
1161# boot a modules.dep even before / is mounted read-write.  However the
1162# boot script depmod is the master version.
1163PHONY += _modinst_post
1164_modinst_post: _modinst_
1165        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1166        $(call cmd,depmod)
1167
1168else # CONFIG_MODULES
1169
1170# Modules not configured
1171# ---------------------------------------------------------------------------
1172
1173modules modules_install: FORCE
1174        @echo
1175        @echo "The present kernel configuration has modules disabled."
1176        @echo "Type 'make config' and enable loadable module support."
1177        @echo "Then build a kernel with module support enabled."
1178        @echo
1179        @exit 1
1180
1181endif # CONFIG_MODULES
1182
1183###
1184# Cleaning is done on three levels.
1185# make clean     Delete most generated files
1186#                Leave enough to build external modules
1187# make mrproper  Delete the current configuration, and all generated files
1188# make distclean Remove editor backup files, patch leftover files and the like
1189
1190# Directories & files removed with 'make clean'
1191CLEAN_DIRS  += $(MODVERDIR)
1192CLEAN_FILES +=  vmlinux System.map \
1193                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1194
1195# Directories & files removed with 'make mrproper'
1196MRPROPER_DIRS  += include/config include2 usr/include include/generated
1197MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1198                  include/linux/autoconf.h include/linux/version.h      \
1199                  include/linux/utsrelease.h                            \
1200                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1201                  Module.symvers Module.markers tags TAGS cscope*
1202
1203# clean - Delete most, but leave enough to build external modules
1204#
1205clean: rm-dirs  := $(CLEAN_DIRS)
1206clean: rm-files := $(CLEAN_FILES)
1207clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1208
1209PHONY += $(clean-dirs) clean archclean
1210$(clean-dirs):
1211        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1212
1213clean: archclean $(clean-dirs)
1214        $(call cmd,rmdirs)
1215        $(call cmd,rmfiles)
1216        @find . $(RCS_FIND_IGNORE) \
1217                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1218                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1219                -o -name '*.symtypes' -o -name 'modules.order' \
1220                -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1221                -o -name '*.gcno' \) -type f -print | xargs rm -f
1222
1223# mrproper - Delete all generated files, including .config
1224#
1225mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1226mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1227mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1228
1229PHONY += $(mrproper-dirs) mrproper archmrproper
1230$(mrproper-dirs):
1231        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1232
1233mrproper: clean archmrproper $(mrproper-dirs)
1234        $(call cmd,rmdirs)
1235        $(call cmd,rmfiles)
1236
1237# distclean
1238#
1239PHONY += distclean
1240
1241distclean: mrproper
1242        @find $(srctree) $(RCS_FIND_IGNORE) \
1243                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1244                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1245                -o -name '.*.rej' -o -size 0 \
1246                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1247                -type f -print | xargs rm -f
1248
1249
1250# Packaging of the kernel to various formats
1251# ---------------------------------------------------------------------------
1252# rpm target kept for backward compatibility
1253package-dir     := $(srctree)/scripts/package
1254
1255%pkg: include/config/kernel.release FORCE
1256        $(Q)$(MAKE) $(build)=$(package-dir) $@
1257rpm: include/config/kernel.release FORCE
1258        $(Q)$(MAKE) $(build)=$(package-dir) $@
1259
1260
1261# Brief documentation of the typical targets used
1262# ---------------------------------------------------------------------------
1263
1264boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1265boards := $(notdir $(boards))
1266board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1267board-dirs := $(sort $(notdir $(board-dirs:/=)))
1268
1269help:
1270        @echo  'Cleaning targets:'
1271        @echo  '  clean           - Remove most generated files but keep the config and'
1272        @echo  '                    enough build support to build external modules'
1273        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1274        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1275        @echo  ''
1276        @echo  'Configuration targets:'
1277        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1278        @echo  ''
1279        @echo  'Other generic targets:'
1280        @echo  '  all             - Build all targets marked with [*]'
1281        @echo  '* vmlinux         - Build the bare kernel'
1282        @echo  '* modules         - Build all modules'
1283        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1284        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1285        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1286        @echo  '  dir/            - Build all files in dir and below'
1287        @echo  '  dir/file.[ois]  - Build specified target only'
1288        @echo  '  dir/file.ko     - Build module including final link'
1289        @echo  '  modules_prepare - Set up for building external modules'
1290        @echo  '  tags/TAGS       - Generate tags file for editors'
1291        @echo  '  cscope          - Generate cscope index'
1292        @echo  '  kernelrelease   - Output the release version string'
1293        @echo  '  kernelversion   - Output the version stored in Makefile'
1294        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1295         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1296         echo  ''
1297        @echo  'Static analysers'
1298        @echo  '  checkstack      - Generate a list of stack hogs'
1299        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1300        @echo  '  versioncheck    - Sanity check on version.h usage'
1301        @echo  '  includecheck    - Check for duplicate included header files'
1302        @echo  '  export_report   - List the usages of all exported symbols'
1303        @echo  '  headers_check   - Sanity check on exported headers'
1304        @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1305         echo  ''
1306        @echo  'Kernel packaging:'
1307        @$(MAKE) $(build)=$(package-dir) help
1308        @echo  ''
1309        @echo  'Documentation targets:'
1310        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1311        @echo  ''
1312        @echo  'Architecture specific targets ($(SRCARCH)):'
1313        @$(if $(archhelp),$(archhelp),\
1314                echo '  No architecture specific help defined for $(SRCARCH)')
1315        @echo  ''
1316        @$(if $(boards), \
1317                $(foreach b, $(boards), \
1318                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1319                echo '')
1320        @$(if $(board-dirs), \
1321                $(foreach b, $(board-dirs), \
1322                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1323                printf "  %-16s - Show all of the above\\n" help-boards; \
1324                echo '')
1325
1326        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1327        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1328        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1329        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1330        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1331        @echo  ''
1332        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1333        @echo  'For further info see the ./README file'
1334
1335
1336help-board-dirs := $(addprefix help-,$(board-dirs))
1337
1338help-boards: $(help-board-dirs)
1339
1340boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1341
1342$(help-board-dirs): help-%:
1343        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1344        @$(if $(boards-per-dir), \
1345                $(foreach b, $(boards-per-dir), \
1346                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1347                echo '')
1348
1349
1350# Documentation targets
1351# ---------------------------------------------------------------------------
1352%docs: scripts_basic FORCE
1353        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1354
1355else # KBUILD_EXTMOD
1356
1357###
1358# External module support.
1359# When building external modules the kernel used as basis is considered
1360# read-only, and no consistency checks are made and the make
1361# system is not used on the basis kernel. If updates are required
1362# in the basis kernel ordinary make commands (without M=...) must
1363# be used.
1364#
1365# The following are the only valid targets when building external
1366# modules.
1367# make M=dir clean     Delete all automatically generated files
1368# make M=dir modules   Make all modules in specified dir
1369# make M=dir           Same as 'make M=dir modules'
1370# make M=dir modules_install
1371#                      Install the modules built in the module directory
1372#                      Assumes install directory is already created
1373
1374# We are always building modules
1375KBUILD_MODULES := 1
1376PHONY += crmodverdir
1377crmodverdir:
1378        $(cmd_crmodverdir)
1379
1380PHONY += $(objtree)/Module.symvers
1381$(objtree)/Module.symvers:
1382        @test -e $(objtree)/Module.symvers || ( \
1383        echo; \
1384        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1385        echo "           is missing; modules will have no dependencies and modversions."; \
1386        echo )
1387
1388module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1389PHONY += $(module-dirs) modules
1390$(module-dirs): crmodverdir $(objtree)/Module.symvers
1391        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1392
1393modules: $(module-dirs)
1394        @$(kecho) '  Building modules, stage 2.';
1395        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1396
1397PHONY += modules_install
1398modules_install: _emodinst_ _emodinst_post
1399
1400install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1401PHONY += _emodinst_
1402_emodinst_:
1403        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1404        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1405
1406PHONY += _emodinst_post
1407_emodinst_post: _emodinst_
1408        $(call cmd,depmod)
1409
1410clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1411
1412PHONY += $(clean-dirs) clean
1413$(clean-dirs):
1414        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1415
1416clean:  rm-dirs := $(MODVERDIR)
1417clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1418                   $(KBUILD_EXTMOD)/Module.markers \
1419                   $(KBUILD_EXTMOD)/modules.order
1420clean: $(clean-dirs)
1421        $(call cmd,rmdirs)
1422        $(call cmd,rmfiles)
1423        @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1424                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1425                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1426                -o -name '*.gcno' \) -type f -print | xargs rm -f
1427
1428help:
1429        @echo  '  Building external modules.'
1430        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1431        @echo  ''
1432        @echo  '  modules         - default target, build the module(s)'
1433        @echo  '  modules_install - install the module'
1434        @echo  '  clean           - remove generated files in module directory only'
1435        @echo  ''
1436
1437# Dummies...
1438PHONY += prepare scripts
1439prepare: ;
1440scripts: ;
1441endif # KBUILD_EXTMOD
1442
1443# Generate tags for editors
1444# ---------------------------------------------------------------------------
1445quiet_cmd_tags = GEN     $@
1446      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1447
1448tags TAGS cscope: FORCE
1449        $(call cmd,tags)
1450
1451# Scripts to check various things for consistency
1452# ---------------------------------------------------------------------------
1453
1454includecheck:
1455        find * $(RCS_FIND_IGNORE) \
1456                -name '*.[hcS]' -type f -print | sort \
1457                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1458
1459versioncheck:
1460        find * $(RCS_FIND_IGNORE) \
1461                -name '*.[hcS]' -type f -print | sort \
1462                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1463
1464namespacecheck:
1465        $(PERL) $(srctree)/scripts/namespace.pl
1466
1467export_report:
1468        $(PERL) $(srctree)/scripts/export_report.pl
1469
1470endif #ifeq ($(config-targets),1)
1471endif #ifeq ($(mixed-targets),1)
1472
1473PHONY += checkstack kernelrelease kernelversion
1474
1475# UML needs a little special treatment here.  It wants to use the host
1476# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1477# else wants $(ARCH), including people doing cross-builds, which means
1478# that $(SUBARCH) doesn't work here.
1479ifeq ($(ARCH), um)
1480CHECKSTACK_ARCH := $(SUBARCH)
1481else
1482CHECKSTACK_ARCH := $(ARCH)
1483endif
1484checkstack:
1485        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1486        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1487
1488kernelrelease:
1489        $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1490        $(error kernelrelease not valid - run 'make prepare' to update it))
1491kernelversion:
1492        @echo $(KERNELVERSION)
1493
1494# Single targets
1495# ---------------------------------------------------------------------------
1496# Single targets are compatible with:
1497# - build with mixed source and output
1498# - build with separate output dir 'make O=...'
1499# - external modules
1500#
1501#  target-dir => where to store outputfile
1502#  build-dir  => directory in kernel source tree to use
1503
1504ifeq ($(KBUILD_EXTMOD),)
1505        build-dir  = $(patsubst %/,%,$(dir $@))
1506        target-dir = $(dir $@)
1507else
1508        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1509        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1510        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1511endif
1512
1513%.s: %.c prepare scripts FORCE
1514        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1515%.i: %.c prepare scripts FORCE
1516        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517%.o: %.c prepare scripts FORCE
1518        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519%.lst: %.c prepare scripts FORCE
1520        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521%.s: %.S prepare scripts FORCE
1522        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523%.o: %.S prepare scripts FORCE
1524        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525%.symtypes: %.c prepare scripts FORCE
1526        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527
1528# Modules
1529/: prepare scripts FORCE
1530        $(cmd_crmodverdir)
1531        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1532        $(build)=$(build-dir)
1533%/: prepare scripts FORCE
1534        $(cmd_crmodverdir)
1535        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1536        $(build)=$(build-dir)
1537%.ko: prepare scripts FORCE
1538        $(cmd_crmodverdir)
1539        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1540        $(build)=$(build-dir) $(@:.ko=.o)
1541        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1542
1543# FIXME Should go into a make.lib or something 
1544# ===========================================================================
1545
1546quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1547      cmd_rmdirs = rm -rf $(rm-dirs)
1548
1549quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1550      cmd_rmfiles = rm -f $(rm-files)
1551
1552# Run depmod only if we have System.map and depmod is executable
1553quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1554      cmd_depmod = \
1555        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1556                $(DEPMOD) -ae -F System.map                                     \
1557                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1558                $(KERNELRELEASE);                                               \
1559        fi
1560
1561# Create temporary dir for module support files
1562# clean it up only when building all modules
1563cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1564                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1565
1566a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1567          $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1568          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1569
1570quiet_cmd_as_o_S = AS      $@
1571cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1572
1573# read all saved command lines
1574
1575targets := $(wildcard $(sort $(targets)))
1576cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1577
1578ifneq ($(cmd_files),)
1579  $(cmd_files): ;       # Do not try to update included dependency files
1580  include $(cmd_files)
1581endif
1582
1583# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1584# Usage:
1585# $(Q)$(MAKE) $(clean)=dir
1586clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1587
1588endif   # skip-makefile
1589
1590PHONY += FORCE
1591FORCE:
1592
1593# Declare the contents of the .PHONY variable as phony.  We keep that
1594# information in a variable so we can use it in if_changed and friends.
1595.PHONY: $(PHONY)
1596