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   1VERSION = 3
   2PATCHLEVEL = 10
   3SUBLEVEL = 108
   4EXTRAVERSION =
   5NAME = END-OF-LIFE
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# Avoid funny character set dependencies
  20unexport LC_ALL
  21LC_COLLATE=C
  22LC_NUMERIC=C
  23export LC_COLLATE LC_NUMERIC
  24
  25# We are using a recursive build, so we need to do a little thinking
  26# to get the ordering right.
  27#
  28# Most importantly: sub-Makefiles should only ever modify files in
  29# their own directory. If in some directory we have a dependency on
  30# a file in another dir (which doesn't happen often, but it's often
  31# unavoidable when linking the built-in.o targets which finally
  32# turn into vmlinux), we will call a sub make in that other dir, and
  33# after that we are sure that everything which is in that other dir
  34# is now up to date.
  35#
  36# The only cases where we need to modify files which have global
  37# effects are thus separated out and done before the recursive
  38# descending is started. They are now explicitly listed as the
  39# prepare rule.
  40
  41# To put more focus on warnings, be less verbose as default
  42# Use 'make V=1' to see the full commands
  43
  44ifeq ("$(origin V)", "command line")
  45  KBUILD_VERBOSE = $(V)
  46endif
  47ifndef KBUILD_VERBOSE
  48  KBUILD_VERBOSE = 0
  49endif
  50
  51# Call a source code checker (by default, "sparse") as part of the
  52# C compilation.
  53#
  54# Use 'make C=1' to enable checking of only re-compiled files.
  55# Use 'make C=2' to enable checking of *all* source files, regardless
  56# of whether they are re-compiled or not.
  57#
  58# See the file "Documentation/sparse.txt" for more details, including
  59# where to get the "sparse" utility.
  60
  61ifeq ("$(origin C)", "command line")
  62  KBUILD_CHECKSRC = $(C)
  63endif
  64ifndef KBUILD_CHECKSRC
  65  KBUILD_CHECKSRC = 0
  66endif
  67
  68# Use make M=dir to specify directory of external module to build
  69# Old syntax make ... SUBDIRS=$PWD is still supported
  70# Setting the environment variable KBUILD_EXTMOD take precedence
  71ifdef SUBDIRS
  72  KBUILD_EXTMOD ?= $(SUBDIRS)
  73endif
  74
  75ifeq ("$(origin M)", "command line")
  76  KBUILD_EXTMOD := $(M)
  77endif
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(KBUILD_SRC),)
  98
  99# OK, Make called in directory where kernel src resides
 100# Do we want to locate output files in a separate directory?
 101ifeq ("$(origin O)", "command line")
 102  KBUILD_OUTPUT := $(O)
 103endif
 104
 105ifeq ("$(origin W)", "command line")
 106  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 107endif
 108
 109# That's our default target when none is given on the command line
 110PHONY := _all
 111_all:
 112
 113# Cancel implicit rules on top Makefile
 114$(CURDIR)/Makefile Makefile: ;
 115
 116ifneq ($(KBUILD_OUTPUT),)
 117# Invoke a second make in the output directory, passing relevant variables
 118# check that the output directory actually exists
 119saved-output := $(KBUILD_OUTPUT)
 120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121$(if $(KBUILD_OUTPUT),, \
 122     $(error output directory "$(saved-output)" does not exist))
 123
 124PHONY += $(MAKECMDGOALS) sub-make
 125
 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127        @:
 128
 129sub-make: FORCE
 130        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131        KBUILD_SRC=$(CURDIR) \
 132        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133        $(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135# Leave processing to above invocation of make
 136skip-makefile := 1
 137endif # ifneq ($(KBUILD_OUTPUT),)
 138endif # ifeq ($(KBUILD_SRC),)
 139
 140# We process the rest of the Makefile if this is the final invocation of make
 141ifeq ($(skip-makefile),)
 142
 143# If building an external module we do not care about the all: rule
 144# but instead _all depend on modules
 145PHONY += all
 146ifeq ($(KBUILD_EXTMOD),)
 147_all: all
 148else
 149_all: modules
 150endif
 151
 152srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153objtree         := $(CURDIR)
 154src             := $(srctree)
 155obj             := $(objtree)
 156
 157VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159export srctree objtree VPATH
 160
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 167
 168SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 169                                  -e s/sun4u/sparc64/ \
 170                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 171                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 172                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 173                                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 174
 175# Cross compiling and selecting different set of gcc/bin-utils
 176# ---------------------------------------------------------------------------
 177#
 178# When performing cross compilation for other architectures ARCH shall be set
 179# to the target architecture. (See arch/* for the possibilities).
 180# ARCH can be set during invocation of make:
 181# make ARCH=ia64
 182# Another way is to have ARCH set in the environment.
 183# The default ARCH is the host where make is executed.
 184
 185# CROSS_COMPILE specify the prefix used for all executables used
 186# during compilation. Only gcc and related bin-utils executables
 187# are prefixed with $(CROSS_COMPILE).
 188# CROSS_COMPILE can be set on the command line
 189# make CROSS_COMPILE=ia64-linux-
 190# Alternatively CROSS_COMPILE can be set in the environment.
 191# A third alternative is to store a setting in .config so that plain
 192# "make" in the configured kernel build directory always uses that.
 193# Default value for CROSS_COMPILE is not to prefix executables
 194# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 195ARCH            ?= $(SUBARCH)
 196CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198# Architecture as present in compile.h
 199UTS_MACHINE     := $(ARCH)
 200SRCARCH         := $(ARCH)
 201
 202# Additional ARCH settings for x86
 203ifeq ($(ARCH),i386)
 204        SRCARCH := x86
 205endif
 206ifeq ($(ARCH),x86_64)
 207        SRCARCH := x86
 208endif
 209
 210# Additional ARCH settings for sparc
 211ifeq ($(ARCH),sparc32)
 212       SRCARCH := sparc
 213endif
 214ifeq ($(ARCH),sparc64)
 215       SRCARCH := sparc
 216endif
 217
 218# Additional ARCH settings for sh
 219ifeq ($(ARCH),sh64)
 220       SRCARCH := sh
 221endif
 222
 223# Additional ARCH settings for tile
 224ifeq ($(ARCH),tilepro)
 225       SRCARCH := tile
 226endif
 227ifeq ($(ARCH),tilegx)
 228       SRCARCH := tile
 229endif
 230
 231# Where to locate arch specific headers
 232hdr-arch  := $(SRCARCH)
 233
 234KCONFIG_CONFIG  ?= .config
 235export KCONFIG_CONFIG
 236
 237# SHELL used by kbuild
 238CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 239          else if [ -x /bin/bash ]; then echo /bin/bash; \
 240          else echo sh; fi ; fi)
 241
 242HOSTCC       = gcc
 243HOSTCXX      = g++
 244HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 245HOSTCXXFLAGS = -O2
 246
 247# Decide whether to build built-in, modular, or both.
 248# Normally, just do built-in.
 249
 250KBUILD_MODULES :=
 251KBUILD_BUILTIN := 1
 252
 253#       If we have only "make modules", don't compile built-in objects.
 254#       When we're building modules with modversions, we need to consider
 255#       the built-in objects during the descend as well, in order to
 256#       make sure the checksums are up to date before we record them.
 257
 258ifeq ($(MAKECMDGOALS),modules)
 259  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 260endif
 261
 262#       If we have "make <whatever> modules", compile modules
 263#       in addition to whatever we do anyway.
 264#       Just "make" or "make all" shall build modules as well
 265
 266ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 267  KBUILD_MODULES := 1
 268endif
 269
 270ifeq ($(MAKECMDGOALS),)
 271  KBUILD_MODULES := 1
 272endif
 273
 274export KBUILD_MODULES KBUILD_BUILTIN
 275export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 276
 277# Beautify output
 278# ---------------------------------------------------------------------------
 279#
 280# Normally, we echo the whole command before executing it. By making
 281# that echo $($(quiet)$(cmd)), we now have the possibility to set
 282# $(quiet) to choose other forms of output instead, e.g.
 283#
 284#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 285#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 286#
 287# If $(quiet) is empty, the whole command will be printed.
 288# If it is set to "quiet_", only the short version will be printed. 
 289# If it is set to "silent_", nothing will be printed at all, since
 290# the variable $(silent_cmd_cc_o_c) doesn't exist.
 291#
 292# A simple variant is to prefix commands with $(Q) - that's useful
 293# for commands that shall be hidden in non-verbose mode.
 294#
 295#       $(Q)ln $@ :<
 296#
 297# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 298# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 299
 300ifeq ($(KBUILD_VERBOSE),1)
 301  quiet =
 302  Q =
 303else
 304  quiet=quiet_
 305  Q = @
 306endif
 307
 308# If the user is running make -s (silent mode), suppress echoing of
 309# commands
 310
 311ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 312  quiet=silent_
 313endif
 314
 315export quiet Q KBUILD_VERBOSE
 316
 317
 318# Look for make include files relative to root of kernel src
 319MAKEFLAGS += --include-dir=$(srctree)
 320
 321# We need some generic definitions (do not try to remake the file).
 322$(srctree)/scripts/Kbuild.include: ;
 323include $(srctree)/scripts/Kbuild.include
 324
 325# Make variables (CC, etc...)
 326
 327AS              = $(CROSS_COMPILE)as
 328LD              = $(CROSS_COMPILE)ld
 329CC              = $(CROSS_COMPILE)gcc
 330CPP             = $(CC) -E
 331AR              = $(CROSS_COMPILE)ar
 332NM              = $(CROSS_COMPILE)nm
 333STRIP           = $(CROSS_COMPILE)strip
 334OBJCOPY         = $(CROSS_COMPILE)objcopy
 335OBJDUMP         = $(CROSS_COMPILE)objdump
 336AWK             = awk
 337GENKSYMS        = scripts/genksyms/genksyms
 338INSTALLKERNEL  := installkernel
 339DEPMOD          = /sbin/depmod
 340PERL            = perl
 341CHECK           = sparse
 342
 343CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 344                  -Wbitwise -Wno-return-void $(CF)
 345CFLAGS_MODULE   =
 346AFLAGS_MODULE   =
 347LDFLAGS_MODULE  =
 348CFLAGS_KERNEL   =
 349AFLAGS_KERNEL   =
 350CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 351
 352
 353# Use USERINCLUDE when you must reference the UAPI directories only.
 354USERINCLUDE    := \
 355                -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 356                -Iarch/$(hdr-arch)/include/generated/uapi \
 357                -I$(srctree)/include/uapi \
 358                -Iinclude/generated/uapi \
 359                -include $(srctree)/include/linux/kconfig.h
 360
 361# Use LINUXINCLUDE when you must reference the include/ directory.
 362# Needed to be compatible with the O= option
 363LINUXINCLUDE    := \
 364                -I$(srctree)/arch/$(hdr-arch)/include \
 365                -Iarch/$(hdr-arch)/include/generated \
 366                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 367                -Iinclude \
 368                $(USERINCLUDE)
 369
 370KBUILD_CPPFLAGS := -D__KERNEL__
 371
 372KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 373                   -fno-strict-aliasing -fno-common \
 374                   -Werror-implicit-function-declaration \
 375                   -Wno-format-security \
 376                   -fno-delete-null-pointer-checks \
 377                   -std=gnu89
 378
 379KBUILD_AFLAGS_KERNEL :=
 380KBUILD_CFLAGS_KERNEL :=
 381KBUILD_AFLAGS   := -D__ASSEMBLY__
 382KBUILD_AFLAGS_MODULE  := -DMODULE
 383KBUILD_CFLAGS_MODULE  := -DMODULE
 384KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 385
 386# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 387KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 388KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 389
 390export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 391export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 392export CPP AR NM STRIP OBJCOPY OBJDUMP
 393export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 394export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 395
 396export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 397export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 398export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 399export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 400export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 401export KBUILD_ARFLAGS
 402
 403# When compiling out-of-tree modules, put MODVERDIR in the module
 404# tree rather than in the kernel tree. The kernel tree might
 405# even be read-only.
 406export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 407
 408# Files to ignore in find ... statements
 409
 410RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
 411                   -o -name .pc -o -name .hg -o -name .git \) -prune -o
 412export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 413                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 414
 415# ===========================================================================
 416# Rules shared between *config targets and build targets
 417
 418# Basic helpers built in scripts/
 419PHONY += scripts_basic
 420scripts_basic:
 421        $(Q)$(MAKE) $(build)=scripts/basic
 422        $(Q)rm -f .tmp_quiet_recordmcount
 423
 424# To avoid any implicit rule to kick in, define an empty command.
 425scripts/basic/%: scripts_basic ;
 426
 427PHONY += outputmakefile
 428# outputmakefile generates a Makefile in the output directory, if using a
 429# separate output directory. This allows convenient use of make in the
 430# output directory.
 431outputmakefile:
 432ifneq ($(KBUILD_SRC),)
 433        $(Q)ln -fsn $(srctree) source
 434        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 435            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 436endif
 437
 438# Support for using generic headers in asm-generic
 439PHONY += asm-generic
 440asm-generic:
 441        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 442                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
 443        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 444                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 445
 446# To make sure we do not include .config for any of the *config targets
 447# catch them early, and hand them over to scripts/kconfig/Makefile
 448# It is allowed to specify more targets when calling make, including
 449# mixing *config targets and build targets.
 450# For example 'make oldconfig all'.
 451# Detect when mixed targets is specified, and make a second invocation
 452# of make so .config is not included in this case either (for *config).
 453
 454version_h := include/generated/uapi/linux/version.h
 455
 456no-dot-config-targets := clean mrproper distclean \
 457                         cscope gtags TAGS tags help %docs check% coccicheck \
 458                         $(version_h) headers_% archheaders archscripts \
 459                         kernelversion %src-pkg
 460
 461config-targets := 0
 462mixed-targets  := 0
 463dot-config     := 1
 464
 465ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 466        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 467                dot-config := 0
 468        endif
 469endif
 470
 471ifeq ($(KBUILD_EXTMOD),)
 472        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 473                config-targets := 1
 474                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 475                        mixed-targets := 1
 476                endif
 477        endif
 478endif
 479
 480ifeq ($(mixed-targets),1)
 481# ===========================================================================
 482# We're called with mixed targets (*config and build targets).
 483# Handle them one by one.
 484
 485%:: FORCE
 486        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 487
 488else
 489ifeq ($(config-targets),1)
 490# ===========================================================================
 491# *config targets only - make sure prerequisites are updated, and descend
 492# in scripts/kconfig to make the *config target
 493
 494# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 495# KBUILD_DEFCONFIG may point out an alternative default configuration
 496# used for 'make defconfig'
 497include $(srctree)/arch/$(SRCARCH)/Makefile
 498export KBUILD_DEFCONFIG KBUILD_KCONFIG
 499
 500config: scripts_basic outputmakefile FORCE
 501        $(Q)mkdir -p include/linux include/config
 502        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 503
 504%config: scripts_basic outputmakefile FORCE
 505        $(Q)mkdir -p include/linux include/config
 506        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 507
 508else
 509# ===========================================================================
 510# Build targets only - this includes vmlinux, arch specific targets, clean
 511# targets and others. In general all targets except *config targets.
 512
 513ifeq ($(KBUILD_EXTMOD),)
 514# Additional helpers built in scripts/
 515# Carefully list dependencies so we do not try to build scripts twice
 516# in parallel
 517PHONY += scripts
 518scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 519         asm-generic
 520        $(Q)$(MAKE) $(build)=$(@)
 521
 522# Objects we will link into vmlinux / subdirs we need to visit
 523init-y          := init/
 524drivers-y       := drivers/ sound/ firmware/
 525net-y           := net/
 526libs-y          := lib/
 527core-y          := usr/
 528endif # KBUILD_EXTMOD
 529
 530ifeq ($(dot-config),1)
 531# Read in config
 532-include include/config/auto.conf
 533
 534ifeq ($(KBUILD_EXTMOD),)
 535# Read in dependencies to all Kconfig* files, make sure to run
 536# oldconfig if changes are detected.
 537-include include/config/auto.conf.cmd
 538
 539# To avoid any implicit rule to kick in, define an empty command
 540$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 541
 542# If .config is newer than include/config/auto.conf, someone tinkered
 543# with it and forgot to run make oldconfig.
 544# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 545# we execute the config step to be sure to catch updated Kconfig files
 546include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 547        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 548else
 549# external modules needs include/generated/autoconf.h and include/config/auto.conf
 550# but do not care if they are up-to-date. Use auto.conf to trigger the test
 551PHONY += include/config/auto.conf
 552
 553include/config/auto.conf:
 554        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 555        echo >&2;                                                       \
 556        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 557        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 558        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 559        echo >&2 ;                                                      \
 560        /bin/false)
 561
 562endif # KBUILD_EXTMOD
 563
 564else
 565# Dummy target needed, because used as prerequisite
 566include/config/auto.conf: ;
 567endif # $(dot-config)
 568
 569# The all: target is the default when no target is given on the
 570# command line.
 571# This allow a user to issue only 'make' to build a kernel including modules
 572# Defaults to vmlinux, but the arch makefile usually adds further targets
 573all: vmlinux
 574
 575ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 576KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 577else
 578KBUILD_CFLAGS   += -O2
 579endif
 580
 581include $(srctree)/arch/$(SRCARCH)/Makefile
 582
 583ifdef CONFIG_READABLE_ASM
 584# Disable optimizations that make assembler listings hard to read.
 585# reorder blocks reorders the control in the function
 586# ipa clone creates specialized cloned functions
 587# partial inlining inlines only parts of functions
 588KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 589                 $(call cc-option,-fno-ipa-cp-clone,) \
 590                 $(call cc-option,-fno-partial-inlining)
 591endif
 592
 593ifneq ($(CONFIG_FRAME_WARN),0)
 594KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 595endif
 596
 597# Force gcc to behave correct even for buggy distributions
 598ifndef CONFIG_CC_STACKPROTECTOR
 599KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 600endif
 601
 602# This warning generated too much noise in a regular build.
 603# Use make W=1 to enable this warning (see scripts/Makefile.build)
 604KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 605
 606ifdef CONFIG_FRAME_POINTER
 607KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 608else
 609# Some targets (ARM with Thumb2, for example), can't be built with frame
 610# pointers.  For those, we don't have FUNCTION_TRACER automatically
 611# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 612# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 613# -fomit-frame-pointer with FUNCTION_TRACER.
 614ifndef CONFIG_FUNCTION_TRACER
 615KBUILD_CFLAGS   += -fomit-frame-pointer
 616endif
 617endif
 618
 619KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 620
 621ifdef CONFIG_DEBUG_INFO
 622KBUILD_CFLAGS   += -g
 623KBUILD_AFLAGS   += -gdwarf-2
 624endif
 625
 626ifdef CONFIG_DEBUG_INFO_REDUCED
 627KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 628                   $(call cc-option,-fno-var-tracking)
 629endif
 630
 631ifdef CONFIG_FUNCTION_TRACER
 632ifdef CONFIG_HAVE_FENTRY
 633CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 634endif
 635KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
 636KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 637ifdef CONFIG_DYNAMIC_FTRACE
 638        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 639                BUILD_C_RECORDMCOUNT := y
 640                export BUILD_C_RECORDMCOUNT
 641        endif
 642endif
 643endif
 644
 645# We trigger additional mismatches with less inlining
 646ifdef CONFIG_DEBUG_SECTION_MISMATCH
 647KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 648endif
 649
 650# arch Makefile may override CC so keep this after arch Makefile is included
 651NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 652CHECKFLAGS     += $(NOSTDINC_FLAGS)
 653
 654# warn about C99 declaration after statement
 655KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 656
 657# disable pointer signed / unsigned warnings in gcc 4.0
 658KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 659
 660# disable invalid "can't wrap" optimizations for signed / pointers
 661KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 662
 663# conserve stack if available
 664KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 665
 666# use the deterministic mode of AR if available
 667KBUILD_ARFLAGS := $(call ar-option,D)
 668
 669# check for 'asm goto'
 670ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 671        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 672endif
 673
 674# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 675KBUILD_CPPFLAGS += $(KCPPFLAGS)
 676KBUILD_AFLAGS += $(KAFLAGS)
 677KBUILD_CFLAGS += $(KCFLAGS)
 678
 679# Use --build-id when available.
 680LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 681                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 682KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 683LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 684
 685ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 686LDFLAGS_vmlinux += $(call ld-option, -X,)
 687endif
 688
 689# Default kernel image to build when no specific target is given.
 690# KBUILD_IMAGE may be overruled on the command line or
 691# set in the environment
 692# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 693# this default value
 694export KBUILD_IMAGE ?= vmlinux
 695
 696#
 697# INSTALL_PATH specifies where to place the updated kernel and system map
 698# images. Default is /boot, but you can set it to other values
 699export  INSTALL_PATH ?= /boot
 700
 701#
 702# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 703# relocations required by build roots.  This is not defined in the
 704# makefile but the argument can be passed to make if needed.
 705#
 706
 707MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 708export MODLIB
 709
 710#
 711#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 712#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 713#  the default option --strip-debug will be used.  Otherwise,
 714#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 715
 716ifdef INSTALL_MOD_STRIP
 717ifeq ($(INSTALL_MOD_STRIP),1)
 718mod_strip_cmd = $(STRIP) --strip-debug
 719else
 720mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 721endif # INSTALL_MOD_STRIP=1
 722else
 723mod_strip_cmd = true
 724endif # INSTALL_MOD_STRIP
 725export mod_strip_cmd
 726
 727
 728ifdef CONFIG_MODULE_SIG_ALL
 729MODSECKEY = ./signing_key.priv
 730MODPUBKEY = ./signing_key.x509
 731export MODPUBKEY
 732mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
 733else
 734mod_sign_cmd = true
 735endif
 736export mod_sign_cmd
 737
 738
 739ifeq ($(KBUILD_EXTMOD),)
 740core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 741
 742vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 743                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 744                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 745
 746vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 747                     $(init-n) $(init-) \
 748                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 749                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 750
 751init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 752core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 753drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 754net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 755libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 756libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 757libs-y          := $(libs-y1) $(libs-y2)
 758
 759# Externally visible symbols (used by link-vmlinux.sh)
 760export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 761export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 762export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 763export LDFLAGS_vmlinux
 764# used by scripts/pacmage/Makefile
 765export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
 766
 767vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 768
 769# Final link of vmlinux
 770      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
 771quiet_cmd_link-vmlinux = LINK    $@
 772
 773# Include targets which we want to
 774# execute if the rest of the kernel build went well.
 775vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
 776ifdef CONFIG_HEADERS_CHECK
 777        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 778endif
 779ifdef CONFIG_SAMPLES
 780        $(Q)$(MAKE) $(build)=samples
 781endif
 782ifdef CONFIG_BUILD_DOCSRC
 783        $(Q)$(MAKE) $(build)=Documentation
 784endif
 785        +$(call if_changed,link-vmlinux)
 786
 787# The actual objects are generated when descending, 
 788# make sure no implicit rule kicks in
 789$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 790
 791# Handle descending into subdirectories listed in $(vmlinux-dirs)
 792# Preset locale variables to speed up the build process. Limit locale
 793# tweaks to this spot to avoid wrong language settings when running
 794# make menuconfig etc.
 795# Error messages still appears in the original language
 796
 797PHONY += $(vmlinux-dirs)
 798$(vmlinux-dirs): prepare scripts
 799        $(Q)$(MAKE) $(build)=$@
 800
 801# Store (new) KERNELRELASE string in include/config/kernel.release
 802include/config/kernel.release: include/config/auto.conf FORCE
 803        $(Q)rm -f $@
 804        $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 805
 806
 807# Things we need to do before we recursively start building the kernel
 808# or the modules are listed in "prepare".
 809# A multi level approach is used. prepareN is processed before prepareN-1.
 810# archprepare is used in arch Makefiles and when processed asm symlink,
 811# version.h and scripts_basic is processed / created.
 812
 813# Listed in dependency order
 814PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 815
 816# prepare3 is used to check if we are building in a separate output directory,
 817# and if so do:
 818# 1) Check that make has not been executed in the kernel src $(srctree)
 819prepare3: include/config/kernel.release
 820ifneq ($(KBUILD_SRC),)
 821        @$(kecho) '  Using $(srctree) as source for kernel'
 822        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 823                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
 824                echo >&2 "  in the '$(srctree)' directory.";\
 825                /bin/false; \
 826        fi;
 827endif
 828
 829# prepare2 creates a makefile if using a separate output directory
 830prepare2: prepare3 outputmakefile asm-generic
 831
 832prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
 833                   include/config/auto.conf
 834        $(cmd_crmodverdir)
 835
 836archprepare: archheaders archscripts prepare1 scripts_basic
 837
 838prepare0: archprepare FORCE
 839        $(Q)$(MAKE) $(build)=.
 840
 841# All the preparing..
 842prepare: prepare0
 843
 844# Generate some files
 845# ---------------------------------------------------------------------------
 846
 847# KERNELRELEASE can change from a few different places, meaning version.h
 848# needs to be updated, so this check is forced on all builds
 849
 850uts_len := 64
 851define filechk_utsrelease.h
 852        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 853          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 854          exit 1;                                                         \
 855        fi;                                                               \
 856        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 857endef
 858
 859define filechk_version.h
 860        (echo \#define LINUX_VERSION_CODE $(shell                         \
 861        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
 862        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 863endef
 864
 865$(version_h): $(srctree)/Makefile FORCE
 866        $(call filechk,version.h)
 867
 868include/generated/utsrelease.h: include/config/kernel.release FORCE
 869        $(call filechk,utsrelease.h)
 870
 871PHONY += headerdep
 872headerdep:
 873        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
 874        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
 875
 876# ---------------------------------------------------------------------------
 877
 878PHONY += depend dep
 879depend dep:
 880        @echo '*** Warning: make $@ is unnecessary now.'
 881
 882# ---------------------------------------------------------------------------
 883# Firmware install
 884INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
 885export INSTALL_FW_PATH
 886
 887PHONY += firmware_install
 888firmware_install: FORCE
 889        @mkdir -p $(objtree)/firmware
 890        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 891
 892# ---------------------------------------------------------------------------
 893# Kernel headers
 894
 895#Default location for installed headers
 896export INSTALL_HDR_PATH = $(objtree)/usr
 897
 898hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 899
 900# If we do an all arch process set dst to asm-$(hdr-arch)
 901hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 902
 903PHONY += archheaders
 904archheaders:
 905
 906PHONY += archscripts
 907archscripts:
 908
 909PHONY += __headers
 910__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
 911        $(Q)$(MAKE) $(build)=scripts build_unifdef
 912
 913PHONY += headers_install_all
 914headers_install_all:
 915        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
 916
 917PHONY += headers_install
 918headers_install: __headers
 919        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
 920          $(error Headers not exportable for the $(SRCARCH) architecture))
 921        $(Q)$(MAKE) $(hdr-inst)=include/uapi
 922        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
 923
 924PHONY += headers_check_all
 925headers_check_all: headers_install_all
 926        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
 927
 928PHONY += headers_check
 929headers_check: headers_install
 930        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
 931        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
 932
 933# ---------------------------------------------------------------------------
 934# Modules
 935
 936ifdef CONFIG_MODULES
 937
 938# By default, build modules as well
 939
 940all: modules
 941
 942#       Build modules
 943#
 944#       A module can be listed more than once in obj-m resulting in
 945#       duplicate lines in modules.order files.  Those are removed
 946#       using awk while concatenating to the final file.
 947
 948PHONY += modules
 949modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
 950        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 951        @$(kecho) '  Building modules, stage 2.';
 952        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 953        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
 954
 955modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 956        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 957
 958%/modules.builtin: include/config/auto.conf
 959        $(Q)$(MAKE) $(modbuiltin)=$*
 960
 961
 962# Target to prepare building external modules
 963PHONY += modules_prepare
 964modules_prepare: prepare scripts
 965
 966# Target to install modules
 967PHONY += modules_install
 968modules_install: _modinst_ _modinst_post
 969
 970PHONY += _modinst_
 971_modinst_:
 972        @rm -rf $(MODLIB)/kernel
 973        @rm -f $(MODLIB)/source
 974        @mkdir -p $(MODLIB)/kernel
 975        @ln -s $(srctree) $(MODLIB)/source
 976        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
 977                rm -f $(MODLIB)/build ; \
 978                ln -s $(objtree) $(MODLIB)/build ; \
 979        fi
 980        @cp -f $(objtree)/modules.order $(MODLIB)/
 981        @cp -f $(objtree)/modules.builtin $(MODLIB)/
 982        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 983
 984# This depmod is only for convenience to give the initial
 985# boot a modules.dep even before / is mounted read-write.  However the
 986# boot script depmod is the master version.
 987PHONY += _modinst_post
 988_modinst_post: _modinst_
 989        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
 990        $(call cmd,depmod)
 991
 992ifeq ($(CONFIG_MODULE_SIG), y)
 993PHONY += modules_sign
 994modules_sign:
 995        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
 996endif
 997
 998else # CONFIG_MODULES
 999
1000# Modules not configured
1001# ---------------------------------------------------------------------------
1002
1003modules modules_install: FORCE
1004        @echo >&2
1005        @echo >&2 "The present kernel configuration has modules disabled."
1006        @echo >&2 "Type 'make config' and enable loadable module support."
1007        @echo >&2 "Then build a kernel with module support enabled."
1008        @echo >&2
1009        @exit 1
1010
1011endif # CONFIG_MODULES
1012
1013###
1014# Cleaning is done on three levels.
1015# make clean     Delete most generated files
1016#                Leave enough to build external modules
1017# make mrproper  Delete the current configuration, and all generated files
1018# make distclean Remove editor backup files, patch leftover files and the like
1019
1020# Directories & files removed with 'make clean'
1021CLEAN_DIRS  += $(MODVERDIR)
1022
1023# Directories & files removed with 'make mrproper'
1024MRPROPER_DIRS  += include/config usr/include include/generated          \
1025                  arch/*/include/generated
1026MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1027                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1028                  signing_key.priv signing_key.x509 x509.genkey         \
1029                  extra_certificates signing_key.x509.keyid             \
1030                  signing_key.x509.signer
1031
1032# clean - Delete most, but leave enough to build external modules
1033#
1034clean: rm-dirs  := $(CLEAN_DIRS)
1035clean: rm-files := $(CLEAN_FILES)
1036clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1037
1038PHONY += $(clean-dirs) clean archclean vmlinuxclean
1039$(clean-dirs):
1040        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1041
1042vmlinuxclean:
1043        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1044
1045clean: archclean vmlinuxclean
1046
1047# mrproper - Delete all generated files, including .config
1048#
1049mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1050mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1051mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1052
1053PHONY += $(mrproper-dirs) mrproper archmrproper
1054$(mrproper-dirs):
1055        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1056
1057mrproper: clean archmrproper $(mrproper-dirs)
1058        $(call cmd,rmdirs)
1059        $(call cmd,rmfiles)
1060
1061# distclean
1062#
1063PHONY += distclean
1064
1065distclean: mrproper
1066        @find $(srctree) $(RCS_FIND_IGNORE) \
1067                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1068                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1069                -o -name '.*.rej' \
1070                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1071                -type f -print | xargs rm -f
1072
1073
1074# Packaging of the kernel to various formats
1075# ---------------------------------------------------------------------------
1076# rpm target kept for backward compatibility
1077package-dir     := $(srctree)/scripts/package
1078
1079%src-pkg: FORCE
1080        $(Q)$(MAKE) $(build)=$(package-dir) $@
1081%pkg: include/config/kernel.release FORCE
1082        $(Q)$(MAKE) $(build)=$(package-dir) $@
1083rpm: include/config/kernel.release FORCE
1084        $(Q)$(MAKE) $(build)=$(package-dir) $@
1085
1086
1087# Brief documentation of the typical targets used
1088# ---------------------------------------------------------------------------
1089
1090boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1091boards := $(notdir $(boards))
1092board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1093board-dirs := $(sort $(notdir $(board-dirs:/=)))
1094
1095help:
1096        @echo  'Cleaning targets:'
1097        @echo  '  clean           - Remove most generated files but keep the config and'
1098        @echo  '                    enough build support to build external modules'
1099        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1100        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1101        @echo  ''
1102        @echo  'Configuration targets:'
1103        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1104        @echo  ''
1105        @echo  'Other generic targets:'
1106        @echo  '  all             - Build all targets marked with [*]'
1107        @echo  '* vmlinux         - Build the bare kernel'
1108        @echo  '* modules         - Build all modules'
1109        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1110        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1111        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1112        @echo  '  dir/            - Build all files in dir and below'
1113        @echo  '  dir/file.[oisS] - Build specified target only'
1114        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1115        @echo  '                    (requires a recent binutils and recent build (System.map))'
1116        @echo  '  dir/file.ko     - Build module including final link'
1117        @echo  '  modules_prepare - Set up for building external modules'
1118        @echo  '  tags/TAGS       - Generate tags file for editors'
1119        @echo  '  cscope          - Generate cscope index'
1120        @echo  '  gtags           - Generate GNU GLOBAL index'
1121        @echo  '  kernelrelease   - Output the release version string'
1122        @echo  '  kernelversion   - Output the version stored in Makefile'
1123        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1124         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1125         echo  ''
1126        @echo  'Static analysers'
1127        @echo  '  checkstack      - Generate a list of stack hogs'
1128        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1129        @echo  '  versioncheck    - Sanity check on version.h usage'
1130        @echo  '  includecheck    - Check for duplicate included header files'
1131        @echo  '  export_report   - List the usages of all exported symbols'
1132        @echo  '  headers_check   - Sanity check on exported headers'
1133        @echo  '  headerdep       - Detect inclusion cycles in headers'
1134        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1135        @echo  ''
1136        @echo  'Kernel packaging:'
1137        @$(MAKE) $(build)=$(package-dir) help
1138        @echo  ''
1139        @echo  'Documentation targets:'
1140        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1141        @echo  ''
1142        @echo  'Architecture specific targets ($(SRCARCH)):'
1143        @$(if $(archhelp),$(archhelp),\
1144                echo '  No architecture specific help defined for $(SRCARCH)')
1145        @echo  ''
1146        @$(if $(boards), \
1147                $(foreach b, $(boards), \
1148                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1149                echo '')
1150        @$(if $(board-dirs), \
1151                $(foreach b, $(board-dirs), \
1152                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1153                printf "  %-16s - Show all of the above\\n" help-boards; \
1154                echo '')
1155
1156        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1157        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1158        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1159        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1160        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1161        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1162        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1163        @echo  '                1: warnings which may be relevant and do not occur too often'
1164        @echo  '                2: warnings which occur quite often but may still be relevant'
1165        @echo  '                3: more obscure warnings, can most likely be ignored'
1166        @echo  '                Multiple levels can be combined with W=12 or W=123'
1167        @echo  ''
1168        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1169        @echo  'For further info see the ./README file'
1170
1171
1172help-board-dirs := $(addprefix help-,$(board-dirs))
1173
1174help-boards: $(help-board-dirs)
1175
1176boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1177
1178$(help-board-dirs): help-%:
1179        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1180        @$(if $(boards-per-dir), \
1181                $(foreach b, $(boards-per-dir), \
1182                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1183                echo '')
1184
1185
1186# Documentation targets
1187# ---------------------------------------------------------------------------
1188%docs: scripts_basic FORCE
1189        $(Q)$(MAKE) $(build)=scripts build_docproc
1190        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1191
1192else # KBUILD_EXTMOD
1193
1194###
1195# External module support.
1196# When building external modules the kernel used as basis is considered
1197# read-only, and no consistency checks are made and the make
1198# system is not used on the basis kernel. If updates are required
1199# in the basis kernel ordinary make commands (without M=...) must
1200# be used.
1201#
1202# The following are the only valid targets when building external
1203# modules.
1204# make M=dir clean     Delete all automatically generated files
1205# make M=dir modules   Make all modules in specified dir
1206# make M=dir           Same as 'make M=dir modules'
1207# make M=dir modules_install
1208#                      Install the modules built in the module directory
1209#                      Assumes install directory is already created
1210
1211# We are always building modules
1212KBUILD_MODULES := 1
1213PHONY += crmodverdir
1214crmodverdir:
1215        $(cmd_crmodverdir)
1216
1217PHONY += $(objtree)/Module.symvers
1218$(objtree)/Module.symvers:
1219        @test -e $(objtree)/Module.symvers || ( \
1220        echo; \
1221        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1222        echo "           is missing; modules will have no dependencies and modversions."; \
1223        echo )
1224
1225module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1226PHONY += $(module-dirs) modules
1227$(module-dirs): crmodverdir $(objtree)/Module.symvers
1228        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1229
1230modules: $(module-dirs)
1231        @$(kecho) '  Building modules, stage 2.';
1232        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1233
1234PHONY += modules_install
1235modules_install: _emodinst_ _emodinst_post
1236
1237install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1238PHONY += _emodinst_
1239_emodinst_:
1240        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1241        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1242
1243PHONY += _emodinst_post
1244_emodinst_post: _emodinst_
1245        $(call cmd,depmod)
1246
1247clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1248
1249PHONY += $(clean-dirs) clean
1250$(clean-dirs):
1251        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1252
1253clean:  rm-dirs := $(MODVERDIR)
1254clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1255
1256help:
1257        @echo  '  Building external modules.'
1258        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1259        @echo  ''
1260        @echo  '  modules         - default target, build the module(s)'
1261        @echo  '  modules_install - install the module'
1262        @echo  '  clean           - remove generated files in module directory only'
1263        @echo  ''
1264
1265# Dummies...
1266PHONY += prepare scripts
1267prepare: ;
1268scripts: ;
1269endif # KBUILD_EXTMOD
1270
1271clean: $(clean-dirs)
1272        $(call cmd,rmdirs)
1273        $(call cmd,rmfiles)
1274        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1275                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1276                -o -name '*.ko.*' \
1277                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1278                -o -name '*.symtypes' -o -name 'modules.order' \
1279                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1280                -o -name '*.gcno' \) -type f -print | xargs rm -f
1281
1282# Generate tags for editors
1283# ---------------------------------------------------------------------------
1284quiet_cmd_tags = GEN     $@
1285      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1286
1287tags TAGS cscope gtags: FORCE
1288        $(call cmd,tags)
1289
1290# Scripts to check various things for consistency
1291# ---------------------------------------------------------------------------
1292
1293PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1294
1295includecheck:
1296        find $(srctree)/* $(RCS_FIND_IGNORE) \
1297                -name '*.[hcS]' -type f -print | sort \
1298                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1299
1300versioncheck:
1301        find $(srctree)/* $(RCS_FIND_IGNORE) \
1302                -name '*.[hcS]' -type f -print | sort \
1303                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1304
1305coccicheck:
1306        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1307
1308namespacecheck:
1309        $(PERL) $(srctree)/scripts/namespace.pl
1310
1311export_report:
1312        $(PERL) $(srctree)/scripts/export_report.pl
1313
1314endif #ifeq ($(config-targets),1)
1315endif #ifeq ($(mixed-targets),1)
1316
1317PHONY += checkstack kernelrelease kernelversion
1318
1319# UML needs a little special treatment here.  It wants to use the host
1320# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1321# else wants $(ARCH), including people doing cross-builds, which means
1322# that $(SUBARCH) doesn't work here.
1323ifeq ($(ARCH), um)
1324CHECKSTACK_ARCH := $(SUBARCH)
1325else
1326CHECKSTACK_ARCH := $(ARCH)
1327endif
1328checkstack:
1329        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1330        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1331
1332kernelrelease:
1333        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1334
1335kernelversion:
1336        @echo $(KERNELVERSION)
1337
1338# Clear a bunch of variables before executing the submake
1339tools/: FORCE
1340        $(Q)mkdir -p $(objtree)/tools
1341        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1342
1343tools/%: FORCE
1344        $(Q)mkdir -p $(objtree)/tools
1345        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1346
1347# Single targets
1348# ---------------------------------------------------------------------------
1349# Single targets are compatible with:
1350# - build with mixed source and output
1351# - build with separate output dir 'make O=...'
1352# - external modules
1353#
1354#  target-dir => where to store outputfile
1355#  build-dir  => directory in kernel source tree to use
1356
1357ifeq ($(KBUILD_EXTMOD),)
1358        build-dir  = $(patsubst %/,%,$(dir $@))
1359        target-dir = $(dir $@)
1360else
1361        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1362        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1363        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1364endif
1365
1366%.s: %.c prepare scripts FORCE
1367        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1368%.i: %.c prepare scripts FORCE
1369        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1370%.o: %.c prepare scripts FORCE
1371        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1372%.lst: %.c prepare scripts FORCE
1373        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1374%.s: %.S prepare scripts FORCE
1375        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1376%.o: %.S prepare scripts FORCE
1377        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1378%.symtypes: %.c prepare scripts FORCE
1379        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1380
1381# Modules
1382/: prepare scripts FORCE
1383        $(cmd_crmodverdir)
1384        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1385        $(build)=$(build-dir)
1386%/: prepare scripts FORCE
1387        $(cmd_crmodverdir)
1388        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1389        $(build)=$(build-dir)
1390%.ko: prepare scripts FORCE
1391        $(cmd_crmodverdir)
1392        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1393        $(build)=$(build-dir) $(@:.ko=.o)
1394        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1395
1396# FIXME Should go into a make.lib or something 
1397# ===========================================================================
1398
1399quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1400      cmd_rmdirs = rm -rf $(rm-dirs)
1401
1402quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1403      cmd_rmfiles = rm -f $(rm-files)
1404
1405# Run depmod only if we have System.map and depmod is executable
1406quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1407      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1408                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1409
1410# Create temporary dir for module support files
1411# clean it up only when building all modules
1412cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1413                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1414
1415# read all saved command lines
1416
1417targets := $(wildcard $(sort $(targets)))
1418cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1419
1420ifneq ($(cmd_files),)
1421  $(cmd_files): ;       # Do not try to update included dependency files
1422  include $(cmd_files)
1423endif
1424
1425# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1426# Usage:
1427# $(Q)$(MAKE) $(clean)=dir
1428clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1429
1430endif   # skip-makefile
1431
1432PHONY += FORCE
1433FORCE:
1434
1435# Declare the contents of the .PHONY variable as phony.  We keep that
1436# information in a variable so we can use it in if_changed and friends.
1437.PHONY: $(PHONY)
1438