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   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 34
   4EXTRAVERSION = .14
   5NAME = Sheep on Meth
   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        $(Q)@:
 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/i386/ -e s/sun4u/sparc64/ \
 169                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                  -e s/sh[234].*/sh/ )
 173
 174# Cross compiling and selecting different set of gcc/bin-utils
 175# ---------------------------------------------------------------------------
 176#
 177# When performing cross compilation for other architectures ARCH shall be set
 178# to the target architecture. (See arch/* for the possibilities).
 179# ARCH can be set during invocation of make:
 180# make ARCH=ia64
 181# Another way is to have ARCH set in the environment.
 182# The default ARCH is the host where make is executed.
 183
 184# CROSS_COMPILE specify the prefix used for all executables used
 185# during compilation. Only gcc and related bin-utils executables
 186# are prefixed with $(CROSS_COMPILE).
 187# CROSS_COMPILE can be set on the command line
 188# make CROSS_COMPILE=ia64-linux-
 189# Alternatively CROSS_COMPILE can be set in the environment.
 190# Default value for CROSS_COMPILE is not to prefix executables
 191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192export KBUILD_BUILDHOST := $(SUBARCH)
 193ARCH            ?= $(SUBARCH)
 194CROSS_COMPILE   ?=
 195
 196# Architecture as present in compile.h
 197UTS_MACHINE     := $(ARCH)
 198SRCARCH         := $(ARCH)
 199
 200# Additional ARCH settings for x86
 201ifeq ($(ARCH),i386)
 202        SRCARCH := x86
 203endif
 204ifeq ($(ARCH),x86_64)
 205        SRCARCH := x86
 206endif
 207
 208# Additional ARCH settings for sparc
 209ifeq ($(ARCH),sparc64)
 210       SRCARCH := sparc
 211endif
 212
 213# Additional ARCH settings for sh
 214ifeq ($(ARCH),sh64)
 215       SRCARCH := sh
 216endif
 217
 218# Where to locate arch specific headers
 219hdr-arch  := $(SRCARCH)
 220
 221ifeq ($(ARCH),m68knommu)
 222       hdr-arch  := m68k
 223endif
 224
 225KCONFIG_CONFIG  ?= .config
 226
 227# SHELL used by kbuild
 228CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 229          else if [ -x /bin/bash ]; then echo /bin/bash; \
 230          else echo sh; fi ; fi)
 231
 232HOSTCC       = gcc
 233HOSTCXX      = g++
 234HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 235HOSTCXXFLAGS = -O2
 236
 237# Decide whether to build built-in, modular, or both.
 238# Normally, just do built-in.
 239
 240KBUILD_MODULES :=
 241KBUILD_BUILTIN := 1
 242
 243#       If we have only "make modules", don't compile built-in objects.
 244#       When we're building modules with modversions, we need to consider
 245#       the built-in objects during the descend as well, in order to
 246#       make sure the checksums are up to date before we record them.
 247
 248ifeq ($(MAKECMDGOALS),modules)
 249  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 250endif
 251
 252#       If we have "make <whatever> modules", compile modules
 253#       in addition to whatever we do anyway.
 254#       Just "make" or "make all" shall build modules as well
 255
 256ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 257  KBUILD_MODULES := 1
 258endif
 259
 260ifeq ($(MAKECMDGOALS),)
 261  KBUILD_MODULES := 1
 262endif
 263
 264export KBUILD_MODULES KBUILD_BUILTIN
 265export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 266
 267# Beautify output
 268# ---------------------------------------------------------------------------
 269#
 270# Normally, we echo the whole command before executing it. By making
 271# that echo $($(quiet)$(cmd)), we now have the possibility to set
 272# $(quiet) to choose other forms of output instead, e.g.
 273#
 274#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 275#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 276#
 277# If $(quiet) is empty, the whole command will be printed.
 278# If it is set to "quiet_", only the short version will be printed. 
 279# If it is set to "silent_", nothing will be printed at all, since
 280# the variable $(silent_cmd_cc_o_c) doesn't exist.
 281#
 282# A simple variant is to prefix commands with $(Q) - that's useful
 283# for commands that shall be hidden in non-verbose mode.
 284#
 285#       $(Q)ln $@ :<
 286#
 287# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 288# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 289
 290ifeq ($(KBUILD_VERBOSE),1)
 291  quiet =
 292  Q =
 293else
 294  quiet=quiet_
 295  Q = @
 296endif
 297
 298# If the user is running make -s (silent mode), suppress echoing of
 299# commands
 300
 301ifneq ($(findstring s,$(MAKEFLAGS)),)
 302  quiet=silent_
 303endif
 304
 305export quiet Q KBUILD_VERBOSE
 306
 307
 308# Look for make include files relative to root of kernel src
 309MAKEFLAGS += --include-dir=$(srctree)
 310
 311# We need some generic definitions (do not try to remake the file).
 312$(srctree)/scripts/Kbuild.include: ;
 313include $(srctree)/scripts/Kbuild.include
 314
 315# Make variables (CC, etc...)
 316
 317AS              = $(CROSS_COMPILE)as
 318LD              = $(CROSS_COMPILE)ld
 319CC              = $(CROSS_COMPILE)gcc
 320CPP             = $(CC) -E
 321AR              = $(CROSS_COMPILE)ar
 322NM              = $(CROSS_COMPILE)nm
 323STRIP           = $(CROSS_COMPILE)strip
 324OBJCOPY         = $(CROSS_COMPILE)objcopy
 325OBJDUMP         = $(CROSS_COMPILE)objdump
 326AWK             = awk
 327GENKSYMS        = scripts/genksyms/genksyms
 328INSTALLKERNEL  := installkernel
 329DEPMOD          = /sbin/depmod
 330KALLSYMS        = scripts/kallsyms
 331PERL            = perl
 332CHECK           = sparse
 333
 334CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 335                  -Wbitwise -Wno-return-void $(CF)
 336MODFLAGS        = -DMODULE
 337CFLAGS_MODULE   = $(MODFLAGS)
 338AFLAGS_MODULE   = $(MODFLAGS)
 339LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds
 340CFLAGS_KERNEL   =
 341AFLAGS_KERNEL   =
 342CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
 343
 344
 345# Use LINUXINCLUDE when you must reference the include/ directory.
 346# Needed to be compatible with the O= option
 347LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
 348                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
 349                   -include include/generated/autoconf.h
 350
 351KBUILD_CPPFLAGS := -D__KERNEL__
 352
 353KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 354                   -fno-strict-aliasing -fno-common \
 355                   -Werror-implicit-function-declaration \
 356                   -Wno-format-security \
 357                   -fno-delete-null-pointer-checks
 358KBUILD_AFLAGS   := -D__ASSEMBLY__
 359
 360# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 361KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 362KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 363
 364export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 365export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 366export CPP AR NM STRIP OBJCOPY OBJDUMP
 367export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 368export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 369
 370export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 371export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 372export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 373
 374# When compiling out-of-tree modules, put MODVERDIR in the module
 375# tree rather than in the kernel tree. The kernel tree might
 376# even be read-only.
 377export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 378
 379# Files to ignore in find ... statements
 380
 381RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 382export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 383
 384# ===========================================================================
 385# Rules shared between *config targets and build targets
 386
 387# Basic helpers built in scripts/
 388PHONY += scripts_basic
 389scripts_basic:
 390        $(Q)$(MAKE) $(build)=scripts/basic
 391        $(Q)rm -f .tmp_quiet_recordmcount
 392
 393# To avoid any implicit rule to kick in, define an empty command.
 394scripts/basic/%: scripts_basic ;
 395
 396PHONY += outputmakefile
 397# outputmakefile generates a Makefile in the output directory, if using a
 398# separate output directory. This allows convenient use of make in the
 399# output directory.
 400outputmakefile:
 401ifneq ($(KBUILD_SRC),)
 402        $(Q)ln -fsn $(srctree) source
 403        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 404            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 405endif
 406
 407# To make sure we do not include .config for any of the *config targets
 408# catch them early, and hand them over to scripts/kconfig/Makefile
 409# It is allowed to specify more targets when calling make, including
 410# mixing *config targets and build targets.
 411# For example 'make oldconfig all'.
 412# Detect when mixed targets is specified, and make a second invocation
 413# of make so .config is not included in this case either (for *config).
 414
 415no-dot-config-targets := clean mrproper distclean \
 416                         cscope TAGS tags help %docs check% \
 417                         include/linux/version.h headers_% \
 418                         kernelrelease kernelversion
 419
 420config-targets := 0
 421mixed-targets  := 0
 422dot-config     := 1
 423
 424ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 425        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 426                dot-config := 0
 427        endif
 428endif
 429
 430ifeq ($(KBUILD_EXTMOD),)
 431        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 432                config-targets := 1
 433                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 434                        mixed-targets := 1
 435                endif
 436        endif
 437endif
 438
 439ifeq ($(mixed-targets),1)
 440# ===========================================================================
 441# We're called with mixed targets (*config and build targets).
 442# Handle them one by one.
 443
 444%:: FORCE
 445        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 446
 447else
 448ifeq ($(config-targets),1)
 449# ===========================================================================
 450# *config targets only - make sure prerequisites are updated, and descend
 451# in scripts/kconfig to make the *config target
 452
 453# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 454# KBUILD_DEFCONFIG may point out an alternative default configuration
 455# used for 'make defconfig'
 456include $(srctree)/arch/$(SRCARCH)/Makefile
 457export KBUILD_DEFCONFIG KBUILD_KCONFIG
 458
 459config: scripts_basic outputmakefile FORCE
 460        $(Q)mkdir -p include/linux include/config
 461        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 462
 463%config: scripts_basic outputmakefile FORCE
 464        $(Q)mkdir -p include/linux include/config
 465        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 466
 467else
 468# ===========================================================================
 469# Build targets only - this includes vmlinux, arch specific targets, clean
 470# targets and others. In general all targets except *config targets.
 471
 472ifeq ($(KBUILD_EXTMOD),)
 473# Additional helpers built in scripts/
 474# Carefully list dependencies so we do not try to build scripts twice
 475# in parallel
 476PHONY += scripts
 477scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 478        $(Q)$(MAKE) $(build)=$(@)
 479
 480# Objects we will link into vmlinux / subdirs we need to visit
 481init-y          := init/
 482drivers-y       := drivers/ sound/ firmware/
 483net-y           := net/
 484libs-y          := lib/
 485core-y          := usr/
 486endif # KBUILD_EXTMOD
 487
 488ifeq ($(dot-config),1)
 489# Read in config
 490-include include/config/auto.conf
 491
 492ifeq ($(KBUILD_EXTMOD),)
 493# Read in dependencies to all Kconfig* files, make sure to run
 494# oldconfig if changes are detected.
 495-include include/config/auto.conf.cmd
 496
 497# To avoid any implicit rule to kick in, define an empty command
 498$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 499
 500# If .config is newer than include/config/auto.conf, someone tinkered
 501# with it and forgot to run make oldconfig.
 502# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 503# we execute the config step to be sure to catch updated Kconfig files
 504include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 505        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 506else
 507# external modules needs include/generated/autoconf.h and include/config/auto.conf
 508# but do not care if they are up-to-date. Use auto.conf to trigger the test
 509PHONY += include/config/auto.conf
 510
 511include/config/auto.conf:
 512        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 513        echo;                                                           \
 514        echo "  ERROR: Kernel configuration is invalid.";               \
 515        echo "         include/generated/autoconf.h or $@ are missing.";\
 516        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 517        echo;                                                           \
 518        /bin/false)
 519
 520endif # KBUILD_EXTMOD
 521
 522else
 523# Dummy target needed, because used as prerequisite
 524include/config/auto.conf: ;
 525endif # $(dot-config)
 526
 527# The all: target is the default when no target is given on the
 528# command line.
 529# This allow a user to issue only 'make' to build a kernel including modules
 530# Defaults vmlinux but it is usually overridden in the arch makefile
 531all: vmlinux
 532
 533ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 534KBUILD_CFLAGS   += -Os
 535else
 536KBUILD_CFLAGS   += -O2
 537endif
 538
 539include $(srctree)/arch/$(SRCARCH)/Makefile
 540
 541ifneq ($(CONFIG_FRAME_WARN),0)
 542KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 543endif
 544
 545# Force gcc to behave correct even for buggy distributions
 546ifndef CONFIG_CC_STACKPROTECTOR
 547KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 548endif
 549
 550# This warning generated too much noise in a regular build.
 551# Use make W=1 to enable this warning (see scripts/Makefile.build)
 552KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 553
 554ifdef CONFIG_FRAME_POINTER
 555KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 556else
 557KBUILD_CFLAGS   += -fomit-frame-pointer
 558endif
 559
 560ifdef CONFIG_DEBUG_INFO
 561KBUILD_CFLAGS   += -g
 562KBUILD_AFLAGS   += -gdwarf-2
 563endif
 564
 565ifdef CONFIG_FUNCTION_TRACER
 566KBUILD_CFLAGS   += -pg
 567endif
 568
 569# We trigger additional mismatches with less inlining
 570ifdef CONFIG_DEBUG_SECTION_MISMATCH
 571KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 572endif
 573
 574# arch Makefile may override CC so keep this after arch Makefile is included
 575NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 576CHECKFLAGS     += $(NOSTDINC_FLAGS)
 577
 578# warn about C99 declaration after statement
 579KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 580
 581# disable pointer signed / unsigned warnings in gcc 4.0
 582KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 583
 584# disable invalid "can't wrap" optimizations for signed / pointers
 585KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 586
 587# revert to pre-gcc-4.4 behaviour of .eh_frame
 588KBUILD_CFLAGS   += $(call cc-option,-fno-dwarf2-cfi-asm)
 589
 590# conserve stack if available
 591KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 592
 593# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 594# But warn user when we do so
 595warn-assign = \
 596$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 597
 598ifneq ($(KCPPFLAGS),)
 599        $(call warn-assign,CPPFLAGS)
 600        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 601endif
 602ifneq ($(KAFLAGS),)
 603        $(call warn-assign,AFLAGS)
 604        KBUILD_AFLAGS += $(KAFLAGS)
 605endif
 606ifneq ($(KCFLAGS),)
 607        $(call warn-assign,CFLAGS)
 608        KBUILD_CFLAGS += $(KCFLAGS)
 609endif
 610
 611# Use --build-id when available.
 612LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 613                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 614LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 615LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 616
 617ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 618LDFLAGS_vmlinux += $(call ld-option, -X,)
 619endif
 620
 621# Default kernel image to build when no specific target is given.
 622# KBUILD_IMAGE may be overruled on the command line or
 623# set in the environment
 624# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 625# this default value
 626export KBUILD_IMAGE ?= vmlinux
 627
 628#
 629# INSTALL_PATH specifies where to place the updated kernel and system map
 630# images. Default is /boot, but you can set it to other values
 631export  INSTALL_PATH ?= /boot
 632
 633#
 634# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 635# relocations required by build roots.  This is not defined in the
 636# makefile but the argument can be passed to make if needed.
 637#
 638
 639MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 640export MODLIB
 641
 642#
 643#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 644#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 645#  the default option --strip-debug will be used.  Otherwise,
 646#  INSTALL_MOD_STRIP will used as the options to the strip command.
 647
 648ifdef INSTALL_MOD_STRIP
 649ifeq ($(INSTALL_MOD_STRIP),1)
 650mod_strip_cmd = $(STRIP) --strip-debug
 651else
 652mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 653endif # INSTALL_MOD_STRIP=1
 654else
 655mod_strip_cmd = true
 656endif # INSTALL_MOD_STRIP
 657export mod_strip_cmd
 658
 659
 660ifeq ($(KBUILD_EXTMOD),)
 661core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 662
 663vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 664                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 665                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 666
 667vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 668                     $(init-n) $(init-) \
 669                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 670                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 671
 672init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 673core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 674drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 675net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 676libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 677libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 678libs-y          := $(libs-y1) $(libs-y2)
 679
 680# Build vmlinux
 681# ---------------------------------------------------------------------------
 682# vmlinux is built from the objects selected by $(vmlinux-init) and
 683# $(vmlinux-main). Most are built-in.o files from top-level directories
 684# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 685# Ordering when linking is important, and $(vmlinux-init) must be first.
 686#
 687# vmlinux
 688#   ^
 689#   |
 690#   +-< $(vmlinux-init)
 691#   |   +--< init/version.o + more
 692#   |
 693#   +--< $(vmlinux-main)
 694#   |    +--< driver/built-in.o mm/built-in.o + more
 695#   |
 696#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 697#
 698# vmlinux version (uname -v) cannot be updated during normal
 699# descending-into-subdirs phase since we do not yet know if we need to
 700# update vmlinux.
 701# Therefore this step is delayed until just before final link of vmlinux -
 702# except in the kallsyms case where it is done just before adding the
 703# symbols to the kernel.
 704#
 705# System.map is generated to document addresses of all kernel symbols
 706
 707vmlinux-init := $(head-y) $(init-y)
 708vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 709vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 710vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 711export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 712
 713# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 714# May be overridden by arch/$(ARCH)/Makefile
 715quiet_cmd_vmlinux__ ?= LD      $@
 716      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 717      -T $(vmlinux-lds) $(vmlinux-init)                          \
 718      --start-group $(vmlinux-main) --end-group                  \
 719      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 720
 721# Generate new vmlinux version
 722quiet_cmd_vmlinux_version = GEN     .version
 723      cmd_vmlinux_version = set -e;                     \
 724        if [ ! -r .version ]; then                      \
 725          rm -f .version;                               \
 726          echo 1 >.version;                             \
 727        else                                            \
 728          mv .version .old_version;                     \
 729          expr 0$$(cat .old_version) + 1 >.version;     \
 730        fi;                                             \
 731        $(MAKE) $(build)=init
 732
 733# Generate System.map
 734quiet_cmd_sysmap = SYSMAP
 735      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 736
 737# Link of vmlinux
 738# If CONFIG_KALLSYMS is set .version is already updated
 739# Generate System.map and verify that the content is consistent
 740# Use + in front of the vmlinux_version rule to silent warning with make -j2
 741# First command is ':' to allow us to use + in front of the rule
 742define rule_vmlinux__
 743        :
 744        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 745
 746        $(call cmd,vmlinux__)
 747        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 748
 749        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 750          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 751        $(cmd_sysmap) $@ System.map;                                         \
 752        if [ $$? -ne 0 ]; then                                               \
 753                rm -f $@;                                                    \
 754                /bin/false;                                                  \
 755        fi;
 756        $(verify_kallsyms)
 757endef
 758
 759
 760ifdef CONFIG_KALLSYMS
 761# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 762# It's a three stage process:
 763# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 764#   empty
 765#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 766#   the right size - vmlinux version (uname -v) is updated during this step
 767# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 768#   but due to the added section, some addresses have shifted.
 769#   From here, we generate a correct .tmp_kallsyms2.o
 770# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 771# o Verify that the System.map from vmlinux matches the map from
 772#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 773# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 774#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 775#   temporary bypass to allow the kernel to be built while the
 776#   maintainers work out what went wrong with kallsyms.
 777
 778ifdef CONFIG_KALLSYMS_EXTRA_PASS
 779last_kallsyms := 3
 780else
 781last_kallsyms := 2
 782endif
 783
 784kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 785
 786define verify_kallsyms
 787        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 788          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 789          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 790        $(Q)cmp -s System.map .tmp_System.map ||                             \
 791                (echo Inconsistent kallsyms data;                            \
 792                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 793                 rm .tmp_kallsyms* ; /bin/false )
 794endef
 795
 796# Update vmlinux version before link
 797# Use + in front of this rule to silent warning about make -j1
 798# First command is ':' to allow us to use + in front of this rule
 799cmd_ksym_ld = $(cmd_vmlinux__)
 800define rule_ksym_ld
 801        : 
 802        +$(call cmd,vmlinux_version)
 803        $(call cmd,vmlinux__)
 804        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 805endef
 806
 807# Generate .S file with all kernel symbols
 808quiet_cmd_kallsyms = KSYM    $@
 809      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 810                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 811
 812.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 813        $(call if_changed_dep,as_o_S)
 814
 815.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 816        $(call cmd,kallsyms)
 817
 818# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 819.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 820        $(call if_changed_rule,ksym_ld)
 821
 822.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 823        $(call if_changed,vmlinux__)
 824
 825.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 826        $(call if_changed,vmlinux__)
 827
 828# Needs to visit scripts/ before $(KALLSYMS) can be used.
 829$(KALLSYMS): scripts ;
 830
 831# Generate some data for debugging strange kallsyms problems
 832debug_kallsyms: .tmp_map$(last_kallsyms)
 833
 834.tmp_map%: .tmp_vmlinux% FORCE
 835        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 836
 837.tmp_map3: .tmp_map2
 838
 839.tmp_map2: .tmp_map1
 840
 841endif # ifdef CONFIG_KALLSYMS
 842
 843# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 844# relevant sections renamed as per the linker script.
 845quiet_cmd_vmlinux-modpost = LD      $@
 846      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 847         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 848         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 849define rule_vmlinux-modpost
 850        :
 851        +$(call cmd,vmlinux-modpost)
 852        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 853        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 854endef
 855
 856# vmlinux image - including updated kernel symbols
 857vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 858ifdef CONFIG_HEADERS_CHECK
 859        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 860endif
 861ifdef CONFIG_SAMPLES
 862        $(Q)$(MAKE) $(build)=samples
 863endif
 864ifdef CONFIG_BUILD_DOCSRC
 865        $(Q)$(MAKE) $(build)=Documentation
 866endif
 867        $(call vmlinux-modpost)
 868        $(call if_changed_rule,vmlinux__)
 869        $(Q)rm -f .old_version
 870
 871# build vmlinux.o first to catch section mismatch errors early
 872ifdef CONFIG_KALLSYMS
 873.tmp_vmlinux1: vmlinux.o
 874endif
 875
 876modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 877vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 878        $(call if_changed_rule,vmlinux-modpost)
 879
 880# The actual objects are generated when descending, 
 881# make sure no implicit rule kicks in
 882$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 883
 884# Handle descending into subdirectories listed in $(vmlinux-dirs)
 885# Preset locale variables to speed up the build process. Limit locale
 886# tweaks to this spot to avoid wrong language settings when running
 887# make menuconfig etc.
 888# Error messages still appears in the original language
 889
 890PHONY += $(vmlinux-dirs)
 891$(vmlinux-dirs): prepare scripts
 892        $(Q)$(MAKE) $(build)=$@
 893ifdef CONFIG_MODULES
 894        $(Q)$(MAKE) $(modbuiltin)=$@
 895endif
 896
 897# Build the kernel release string
 898#
 899# The KERNELRELEASE value built here is stored in the file
 900# include/config/kernel.release, and is used when executing several
 901# make targets, such as "make install" or "make modules_install."
 902#
 903# The eventual kernel release string consists of the following fields,
 904# shown in a hierarchical format to show how smaller parts are concatenated
 905# to form the larger and final value, with values coming from places like
 906# the Makefile, kernel config options, make command line options and/or
 907# SCM tag information.
 908#
 909#       $(KERNELVERSION)
 910#         $(VERSION)                    eg, 2
 911#         $(PATCHLEVEL)                 eg, 6
 912#         $(SUBLEVEL)                   eg, 18
 913#         $(EXTRAVERSION)               eg, -rc6
 914#       $(localver-full)
 915#         $(localver)
 916#           localversion*               (files without backups, containing '~')
 917#           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 918#         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 919#           ./scripts/setlocalversion   (SCM tag, if one exists)
 920#           $(LOCALVERSION)             (from make command line if provided)
 921#
 922#  Note how the final $(localver-auto) string is included *only* if the
 923# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 924# moment, only git is supported but other SCMs can edit the script
 925# scripts/setlocalversion and add the appropriate checks as needed.
 926
 927pattern = ".*/localversion[^~]*"
 928string  = $(shell cat /dev/null \
 929           `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 930
 931localver = $(subst $(space),, $(string) \
 932                              $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 933
 934# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 935# and if the SCM is know a tag from the SCM is appended.
 936# The appended tag is determined by the SCM used.
 937#
 938# .scmversion is used when generating rpm packages so we do not loose
 939# the version information from the SCM when we do the build of the kernel
 940# from the copied source
 941ifdef CONFIG_LOCALVERSION_AUTO
 942
 943ifeq ($(wildcard .scmversion),)
 944        _localver-auto = $(shell $(CONFIG_SHELL) \
 945                         $(srctree)/scripts/setlocalversion $(srctree))
 946else
 947        _localver-auto = $(shell cat .scmversion 2> /dev/null)
 948endif
 949
 950        localver-auto  = $(LOCALVERSION)$(_localver-auto)
 951endif
 952
 953localver-full = $(localver)$(localver-auto)
 954
 955# Store (new) KERNELRELASE string in include/config/kernel.release
 956kernelrelease = $(KERNELVERSION)$(localver-full)
 957include/config/kernel.release: include/config/auto.conf FORCE
 958        $(Q)rm -f $@
 959        $(Q)echo $(kernelrelease) > $@
 960
 961
 962# Things we need to do before we recursively start building the kernel
 963# or the modules are listed in "prepare".
 964# A multi level approach is used. prepareN is processed before prepareN-1.
 965# archprepare is used in arch Makefiles and when processed asm symlink,
 966# version.h and scripts_basic is processed / created.
 967
 968# Listed in dependency order
 969PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 970
 971# prepare3 is used to check if we are building in a separate output directory,
 972# and if so do:
 973# 1) Check that make has not been executed in the kernel src $(srctree)
 974prepare3: include/config/kernel.release
 975ifneq ($(KBUILD_SRC),)
 976        @$(kecho) '  Using $(srctree) as source for kernel'
 977        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 978                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 979                echo "  in the '$(srctree)' directory.";\
 980                /bin/false; \
 981        fi;
 982endif
 983
 984# prepare2 creates a makefile if using a separate output directory
 985prepare2: prepare3 outputmakefile
 986
 987prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 988                   include/config/auto.conf
 989        $(cmd_crmodverdir)
 990
 991archprepare: prepare1 scripts_basic
 992
 993prepare0: archprepare FORCE
 994        $(Q)$(MAKE) $(build)=.
 995        $(Q)$(MAKE) $(build)=. missing-syscalls
 996
 997# All the preparing..
 998prepare: prepare0
 999
1000# Generate some files
1001# ---------------------------------------------------------------------------
1002
1003# KERNELRELEASE can change from a few different places, meaning version.h
1004# needs to be updated, so this check is forced on all builds
1005
1006uts_len := 64
1007define filechk_utsrelease.h
1008        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1009          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1010          exit 1;                                                         \
1011        fi;                                                               \
1012        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1013endef
1014
1015define filechk_version.h
1016        (echo \#define LINUX_VERSION_CODE $(shell                             \
1017        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1018        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1019endef
1020
1021include/linux/version.h: $(srctree)/Makefile FORCE
1022        $(call filechk,version.h)
1023
1024include/generated/utsrelease.h: include/config/kernel.release FORCE
1025        $(call filechk,utsrelease.h)
1026
1027PHONY += headerdep
1028headerdep:
1029        $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1030
1031# ---------------------------------------------------------------------------
1032
1033PHONY += depend dep
1034depend dep:
1035        @echo '*** Warning: make $@ is unnecessary now.'
1036
1037# ---------------------------------------------------------------------------
1038# Firmware install
1039INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1040export INSTALL_FW_PATH
1041
1042PHONY += firmware_install
1043firmware_install: FORCE
1044        @mkdir -p $(objtree)/firmware
1045        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1046
1047# ---------------------------------------------------------------------------
1048# Kernel headers
1049
1050#Default location for installed headers
1051export INSTALL_HDR_PATH = $(objtree)/usr
1052
1053hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1054
1055# If we do an all arch process set dst to asm-$(hdr-arch)
1056hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1057
1058PHONY += __headers
1059__headers: include/linux/version.h scripts_basic FORCE
1060        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1061
1062PHONY += headers_install_all
1063headers_install_all:
1064        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1065
1066PHONY += headers_install
1067headers_install: __headers
1068        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1069        $(error Headers not exportable for the $(SRCARCH) architecture))
1070        $(Q)$(MAKE) $(hdr-inst)=include
1071        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1072
1073PHONY += headers_check_all
1074headers_check_all: headers_install_all
1075        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1076
1077PHONY += headers_check
1078headers_check: headers_install
1079        $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1080        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1081
1082# ---------------------------------------------------------------------------
1083# Modules
1084
1085ifdef CONFIG_MODULES
1086
1087# By default, build modules as well
1088
1089all: modules
1090
1091#       Build modules
1092#
1093#       A module can be listed more than once in obj-m resulting in
1094#       duplicate lines in modules.order files.  Those are removed
1095#       using awk while concatenating to the final file.
1096
1097PHONY += modules
1098modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1099        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1100        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
1101        @$(kecho) '  Building modules, stage 2.';
1102        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1103        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1104
1105
1106# Target to prepare building external modules
1107PHONY += modules_prepare
1108modules_prepare: prepare scripts
1109
1110# Target to install modules
1111PHONY += modules_install
1112modules_install: _modinst_ _modinst_post
1113
1114PHONY += _modinst_
1115_modinst_:
1116        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1117                echo "Warning: you may need to install module-init-tools"; \
1118                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1119                sleep 1; \
1120        fi
1121        @rm -rf $(MODLIB)/kernel
1122        @rm -f $(MODLIB)/source
1123        @mkdir -p $(MODLIB)/kernel
1124        @ln -s $(srctree) $(MODLIB)/source
1125        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1126                rm -f $(MODLIB)/build ; \
1127                ln -s $(objtree) $(MODLIB)/build ; \
1128        fi
1129        @cp -f $(objtree)/modules.order $(MODLIB)/
1130        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1131        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1132
1133# This depmod is only for convenience to give the initial
1134# boot a modules.dep even before / is mounted read-write.  However the
1135# boot script depmod is the master version.
1136PHONY += _modinst_post
1137_modinst_post: _modinst_
1138        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1139        $(call cmd,depmod)
1140
1141else # CONFIG_MODULES
1142
1143# Modules not configured
1144# ---------------------------------------------------------------------------
1145
1146modules modules_install: FORCE
1147        @echo
1148        @echo "The present kernel configuration has modules disabled."
1149        @echo "Type 'make config' and enable loadable module support."
1150        @echo "Then build a kernel with module support enabled."
1151        @echo
1152        @exit 1
1153
1154endif # CONFIG_MODULES
1155
1156###
1157# Cleaning is done on three levels.
1158# make clean     Delete most generated files
1159#                Leave enough to build external modules
1160# make mrproper  Delete the current configuration, and all generated files
1161# make distclean Remove editor backup files, patch leftover files and the like
1162
1163# Directories & files removed with 'make clean'
1164CLEAN_DIRS  += $(MODVERDIR)
1165CLEAN_FILES +=  vmlinux System.map \
1166                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1167
1168# Directories & files removed with 'make mrproper'
1169MRPROPER_DIRS  += include/config usr/include include/generated
1170MRPROPER_FILES += .config .config.old .version .old_version             \
1171                  include/linux/version.h                               \
1172                  Module.symvers tags TAGS cscope*
1173
1174# clean - Delete most, but leave enough to build external modules
1175#
1176clean: rm-dirs  := $(CLEAN_DIRS)
1177clean: rm-files := $(CLEAN_FILES)
1178clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1179
1180PHONY += $(clean-dirs) clean archclean
1181$(clean-dirs):
1182        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1183
1184clean: archclean $(clean-dirs)
1185        $(call cmd,rmdirs)
1186        $(call cmd,rmfiles)
1187        @find . $(RCS_FIND_IGNORE) \
1188                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1189                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1190                -o -name '*.symtypes' -o -name 'modules.order' \
1191                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1192                -o -name '*.gcno' \) -type f -print | xargs rm -f
1193
1194# mrproper - Delete all generated files, including .config
1195#
1196mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1197mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1198mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1199
1200PHONY += $(mrproper-dirs) mrproper archmrproper
1201$(mrproper-dirs):
1202        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1203
1204mrproper: clean archmrproper $(mrproper-dirs)
1205        $(call cmd,rmdirs)
1206        $(call cmd,rmfiles)
1207
1208# distclean
1209#
1210PHONY += distclean
1211
1212distclean: mrproper
1213        @find $(srctree) $(RCS_FIND_IGNORE) \
1214                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1215                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1216                -o -name '.*.rej' -o -size 0 \
1217                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1218                -type f -print | xargs rm -f
1219
1220
1221# Packaging of the kernel to various formats
1222# ---------------------------------------------------------------------------
1223# rpm target kept for backward compatibility
1224package-dir     := $(srctree)/scripts/package
1225
1226%pkg: include/config/kernel.release FORCE
1227        $(Q)$(MAKE) $(build)=$(package-dir) $@
1228rpm: include/config/kernel.release FORCE
1229        $(Q)$(MAKE) $(build)=$(package-dir) $@
1230
1231
1232# Brief documentation of the typical targets used
1233# ---------------------------------------------------------------------------
1234
1235boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1236boards := $(notdir $(boards))
1237board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1238board-dirs := $(sort $(notdir $(board-dirs:/=)))
1239
1240help:
1241        @echo  'Cleaning targets:'
1242        @echo  '  clean           - Remove most generated files but keep the config and'
1243        @echo  '                    enough build support to build external modules'
1244        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1245        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1246        @echo  ''
1247        @echo  'Configuration targets:'
1248        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1249        @echo  ''
1250        @echo  'Other generic targets:'
1251        @echo  '  all             - Build all targets marked with [*]'
1252        @echo  '* vmlinux         - Build the bare kernel'
1253        @echo  '* modules         - Build all modules'
1254        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1255        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1256        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1257        @echo  '  dir/            - Build all files in dir and below'
1258        @echo  '  dir/file.[ois]  - Build specified target only'
1259        @echo  '  dir/file.ko     - Build module including final link'
1260        @echo  '  modules_prepare - Set up for building external modules'
1261        @echo  '  tags/TAGS       - Generate tags file for editors'
1262        @echo  '  cscope          - Generate cscope index'
1263        @echo  '  kernelrelease   - Output the release version string'
1264        @echo  '  kernelversion   - Output the version stored in Makefile'
1265        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1266         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1267         echo  ''
1268        @echo  'Static analysers'
1269        @echo  '  checkstack      - Generate a list of stack hogs'
1270        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1271        @echo  '  versioncheck    - Sanity check on version.h usage'
1272        @echo  '  includecheck    - Check for duplicate included header files'
1273        @echo  '  export_report   - List the usages of all exported symbols'
1274        @echo  '  headers_check   - Sanity check on exported headers'
1275        @echo  '  headerdep       - Detect inclusion cycles in headers'; \
1276         echo  ''
1277        @echo  'Kernel packaging:'
1278        @$(MAKE) $(build)=$(package-dir) help
1279        @echo  ''
1280        @echo  'Documentation targets:'
1281        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1282        @echo  ''
1283        @echo  'Architecture specific targets ($(SRCARCH)):'
1284        @$(if $(archhelp),$(archhelp),\
1285                echo '  No architecture specific help defined for $(SRCARCH)')
1286        @echo  ''
1287        @$(if $(boards), \
1288                $(foreach b, $(boards), \
1289                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1290                echo '')
1291        @$(if $(board-dirs), \
1292                $(foreach b, $(board-dirs), \
1293                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1294                printf "  %-16s - Show all of the above\\n" help-boards; \
1295                echo '')
1296
1297        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1298        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1299        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1300        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1301        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1302        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1303        @echo  '                1: warnings which may be relevant and do not occur too often'
1304        @echo  '                2: warnings which occur quite often but may still be relevant'
1305        @echo  '                3: more obscure warnings, can most likely be ignored'
1306
1307        @echo  ''
1308        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1309        @echo  'For further info see the ./README file'
1310
1311
1312help-board-dirs := $(addprefix help-,$(board-dirs))
1313
1314help-boards: $(help-board-dirs)
1315
1316boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1317
1318$(help-board-dirs): help-%:
1319        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1320        @$(if $(boards-per-dir), \
1321                $(foreach b, $(boards-per-dir), \
1322                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1323                echo '')
1324
1325
1326# Documentation targets
1327# ---------------------------------------------------------------------------
1328%docs: scripts_basic FORCE
1329        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1330
1331else # KBUILD_EXTMOD
1332
1333###
1334# External module support.
1335# When building external modules the kernel used as basis is considered
1336# read-only, and no consistency checks are made and the make
1337# system is not used on the basis kernel. If updates are required
1338# in the basis kernel ordinary make commands (without M=...) must
1339# be used.
1340#
1341# The following are the only valid targets when building external
1342# modules.
1343# make M=dir clean     Delete all automatically generated files
1344# make M=dir modules   Make all modules in specified dir
1345# make M=dir           Same as 'make M=dir modules'
1346# make M=dir modules_install
1347#                      Install the modules built in the module directory
1348#                      Assumes install directory is already created
1349
1350# We are always building modules
1351KBUILD_MODULES := 1
1352PHONY += crmodverdir
1353crmodverdir:
1354        $(cmd_crmodverdir)
1355
1356PHONY += $(objtree)/Module.symvers
1357$(objtree)/Module.symvers:
1358        @test -e $(objtree)/Module.symvers || ( \
1359        echo; \
1360        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1361        echo "           is missing; modules will have no dependencies and modversions."; \
1362        echo )
1363
1364module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1365PHONY += $(module-dirs) modules
1366$(module-dirs): crmodverdir $(objtree)/Module.symvers
1367        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1368
1369modules: $(module-dirs)
1370        @$(kecho) '  Building modules, stage 2.';
1371        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1372
1373PHONY += modules_install
1374modules_install: _emodinst_ _emodinst_post
1375
1376install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1377PHONY += _emodinst_
1378_emodinst_:
1379        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1380        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1381
1382PHONY += _emodinst_post
1383_emodinst_post: _emodinst_
1384        $(call cmd,depmod)
1385
1386clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1387
1388PHONY += $(clean-dirs) clean
1389$(clean-dirs):
1390        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1391
1392clean:  rm-dirs := $(MODVERDIR)
1393clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1394                   $(KBUILD_EXTMOD)/modules.order \
1395                   $(KBUILD_EXTMOD)/modules.builtin
1396clean: $(clean-dirs)
1397        $(call cmd,rmdirs)
1398        $(call cmd,rmfiles)
1399        @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1400                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1401                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1402                -o -name '*.gcno' \) -type f -print | xargs rm -f
1403
1404help:
1405        @echo  '  Building external modules.'
1406        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1407        @echo  ''
1408        @echo  '  modules         - default target, build the module(s)'
1409        @echo  '  modules_install - install the module'
1410        @echo  '  clean           - remove generated files in module directory only'
1411        @echo  ''
1412
1413# Dummies...
1414PHONY += prepare scripts
1415prepare: ;
1416scripts: ;
1417endif # KBUILD_EXTMOD
1418
1419# Generate tags for editors
1420# ---------------------------------------------------------------------------
1421quiet_cmd_tags = GEN     $@
1422      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1423
1424tags TAGS cscope: FORCE
1425        $(call cmd,tags)
1426
1427# Scripts to check various things for consistency
1428# ---------------------------------------------------------------------------
1429
1430includecheck:
1431        find * $(RCS_FIND_IGNORE) \
1432                -name '*.[hcS]' -type f -print | sort \
1433                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1434
1435versioncheck:
1436        find * $(RCS_FIND_IGNORE) \
1437                -name '*.[hcS]' -type f -print | sort \
1438                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1439
1440namespacecheck:
1441        $(PERL) $(srctree)/scripts/namespace.pl
1442
1443export_report:
1444        $(PERL) $(srctree)/scripts/export_report.pl
1445
1446endif #ifeq ($(config-targets),1)
1447endif #ifeq ($(mixed-targets),1)
1448
1449PHONY += checkstack kernelrelease kernelversion
1450
1451# UML needs a little special treatment here.  It wants to use the host
1452# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1453# else wants $(ARCH), including people doing cross-builds, which means
1454# that $(SUBARCH) doesn't work here.
1455ifeq ($(ARCH), um)
1456CHECKSTACK_ARCH := $(SUBARCH)
1457else
1458CHECKSTACK_ARCH := $(ARCH)
1459endif
1460checkstack:
1461        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1462        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1463
1464kernelrelease:
1465        $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1466        $(error kernelrelease not valid - run 'make prepare' to update it))
1467kernelversion:
1468        @echo $(KERNELVERSION)
1469
1470# Single targets
1471# ---------------------------------------------------------------------------
1472# Single targets are compatible with:
1473# - build with mixed source and output
1474# - build with separate output dir 'make O=...'
1475# - external modules
1476#
1477#  target-dir => where to store outputfile
1478#  build-dir  => directory in kernel source tree to use
1479
1480ifeq ($(KBUILD_EXTMOD),)
1481        build-dir  = $(patsubst %/,%,$(dir $@))
1482        target-dir = $(dir $@)
1483else
1484        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1485        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1486        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1487endif
1488
1489%.s: %.c prepare scripts FORCE
1490        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491%.i: %.c prepare scripts FORCE
1492        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493%.o: %.c prepare scripts FORCE
1494        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495%.lst: %.c prepare scripts FORCE
1496        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497%.s: %.S prepare scripts FORCE
1498        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499%.o: %.S prepare scripts FORCE
1500        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501%.symtypes: %.c prepare scripts FORCE
1502        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503
1504# Modules
1505/: prepare scripts FORCE
1506        $(cmd_crmodverdir)
1507        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1508        $(build)=$(build-dir)
1509%/: prepare scripts FORCE
1510        $(cmd_crmodverdir)
1511        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512        $(build)=$(build-dir)
1513%.ko: prepare scripts FORCE
1514        $(cmd_crmodverdir)
1515        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1516        $(build)=$(build-dir) $(@:.ko=.o)
1517        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1518
1519# FIXME Should go into a make.lib or something 
1520# ===========================================================================
1521
1522quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1523      cmd_rmdirs = rm -rf $(rm-dirs)
1524
1525quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1526      cmd_rmfiles = rm -f $(rm-files)
1527
1528# Run depmod only if we have System.map and depmod is executable
1529quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1530      cmd_depmod = \
1531        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1532                $(DEPMOD) -ae -F System.map                                     \
1533                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) )     \
1534                $(KERNELRELEASE);                                               \
1535        fi
1536
1537# Create temporary dir for module support files
1538# clean it up only when building all modules
1539cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1540                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1541
1542a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1543          $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1544          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1545
1546quiet_cmd_as_o_S = AS      $@
1547cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1548
1549# read all saved command lines
1550
1551targets := $(wildcard $(sort $(targets)))
1552cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1553
1554ifneq ($(cmd_files),)
1555  $(cmd_files): ;       # Do not try to update included dependency files
1556  include $(cmd_files)
1557endif
1558
1559# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1560# Usage:
1561# $(Q)$(MAKE) $(clean)=dir
1562clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1563
1564endif   # skip-makefile
1565
1566PHONY += FORCE
1567FORCE:
1568
1569# Declare the contents of the .PHONY variable as phony.  We keep that
1570# information in a variable so we can use it in if_changed and friends.
1571.PHONY: $(PHONY)
1572