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   1VERSION = 2
   2PATCHLEVEL = 6
   3SUBLEVEL = 26
   4EXTRAVERSION = .8
   5NAME = Rotary Wombat
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# We are using a recursive build, so we need to do a little thinking
  20# to get the ordering right.
  21#
  22# Most importantly: sub-Makefiles should only ever modify files in
  23# their own directory. If in some directory we have a dependency on
  24# a file in another dir (which doesn't happen often, but it's often
  25# unavoidable when linking the built-in.o targets which finally
  26# turn into vmlinux), we will call a sub make in that other dir, and
  27# after that we are sure that everything which is in that other dir
  28# is now up to date.
  29#
  30# The only cases where we need to modify files which have global
  31# effects are thus separated out and done before the recursive
  32# descending is started. They are now explicitly listed as the
  33# prepare rule.
  34
  35# To put more focus on warnings, be less verbose as default
  36# Use 'make V=1' to see the full commands
  37
  38ifdef V
  39  ifeq ("$(origin V)", "command line")
  40    KBUILD_VERBOSE = $(V)
  41  endif
  42endif
  43ifndef KBUILD_VERBOSE
  44  KBUILD_VERBOSE = 0
  45endif
  46
  47# Call a source code checker (by default, "sparse") as part of the
  48# C compilation.
  49#
  50# Use 'make C=1' to enable checking of only re-compiled files.
  51# Use 'make C=2' to enable checking of *all* source files, regardless
  52# of whether they are re-compiled or not.
  53#
  54# See the file "Documentation/sparse.txt" for more details, including
  55# where to get the "sparse" utility.
  56
  57ifdef C
  58  ifeq ("$(origin C)", "command line")
  59    KBUILD_CHECKSRC = $(C)
  60  endif
  61endif
  62ifndef KBUILD_CHECKSRC
  63  KBUILD_CHECKSRC = 0
  64endif
  65
  66# Use make M=dir to specify directory of external module to build
  67# Old syntax make ... SUBDIRS=$PWD is still supported
  68# Setting the environment variable KBUILD_EXTMOD take precedence
  69ifdef SUBDIRS
  70  KBUILD_EXTMOD ?= $(SUBDIRS)
  71endif
  72ifdef M
  73  ifeq ("$(origin M)", "command line")
  74    KBUILD_EXTMOD := $(M)
  75  endif
  76endif
  77
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(KBUILD_SRC),)
  98
  99# OK, Make called in directory where kernel src resides
 100# Do we want to locate output files in a separate directory?
 101ifdef O
 102  ifeq ("$(origin O)", "command line")
 103    KBUILD_OUTPUT := $(O)
 104  endif
 105endif
 106
 107# That's our default target when none is given on the command line
 108PHONY := _all
 109_all:
 110
 111# Cancel implicit rules on top Makefile
 112$(CURDIR)/Makefile Makefile: ;
 113
 114ifneq ($(KBUILD_OUTPUT),)
 115# Invoke a second make in the output directory, passing relevant variables
 116# check that the output directory actually exists
 117saved-output := $(KBUILD_OUTPUT)
 118KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 119$(if $(KBUILD_OUTPUT),, \
 120     $(error output directory "$(saved-output)" does not exist))
 121
 122PHONY += $(MAKECMDGOALS) sub-make
 123
 124$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 125        $(Q)@:
 126
 127sub-make: FORCE
 128        $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 129        KBUILD_SRC=$(CURDIR) \
 130        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 131        $(filter-out _all sub-make,$(MAKECMDGOALS))
 132
 133# Leave processing to above invocation of make
 134skip-makefile := 1
 135endif # ifneq ($(KBUILD_OUTPUT),)
 136endif # ifeq ($(KBUILD_SRC),)
 137
 138# We process the rest of the Makefile if this is the final invocation of make
 139ifeq ($(skip-makefile),)
 140
 141# If building an external module we do not care about the all: rule
 142# but instead _all depend on modules
 143PHONY += all
 144ifeq ($(KBUILD_EXTMOD),)
 145_all: all
 146else
 147_all: modules
 148endif
 149
 150srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 151TOPDIR          := $(srctree)
 152# FIXME - TOPDIR is obsolete, use srctree/objtree
 153objtree         := $(CURDIR)
 154src             := $(srctree)
 155obj             := $(objtree)
 156
 157VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 158
 159export srctree objtree VPATH TOPDIR
 160
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 167
 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 169                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 170                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172                                  -e s/sh.*/sh/ )
 173
 174# Cross compiling and selecting different set of gcc/bin-utils
 175# ---------------------------------------------------------------------------
 176#
 177# When performing cross compilation for other architectures ARCH shall be set
 178# to the target architecture. (See arch/* for the possibilities).
 179# ARCH can be set during invocation of make:
 180# make ARCH=ia64
 181# Another way is to have ARCH set in the environment.
 182# The default ARCH is the host where make is executed.
 183
 184# CROSS_COMPILE specify the prefix used for all executables used
 185# during compilation. Only gcc and related bin-utils executables
 186# are prefixed with $(CROSS_COMPILE).
 187# CROSS_COMPILE can be set on the command line
 188# make CROSS_COMPILE=ia64-linux-
 189# Alternatively CROSS_COMPILE can be set in the environment.
 190# Default value for CROSS_COMPILE is not to prefix executables
 191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 192export KBUILD_BUILDHOST := $(SUBARCH)
 193ARCH            ?= $(SUBARCH)
 194CROSS_COMPILE   ?=
 195
 196# Architecture as present in compile.h
 197UTS_MACHINE     := $(ARCH)
 198SRCARCH         := $(ARCH)
 199
 200# Additional ARCH settings for x86
 201ifeq ($(ARCH),i386)
 202        SRCARCH := x86
 203endif
 204ifeq ($(ARCH),x86_64)
 205        SRCARCH := x86
 206endif
 207
 208KCONFIG_CONFIG  ?= .config
 209
 210# SHELL used by kbuild
 211CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 212          else if [ -x /bin/bash ]; then echo /bin/bash; \
 213          else echo sh; fi ; fi)
 214
 215HOSTCC       = gcc
 216HOSTCXX      = g++
 217HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
 218HOSTCXXFLAGS = -O2
 219
 220# Decide whether to build built-in, modular, or both.
 221# Normally, just do built-in.
 222
 223KBUILD_MODULES :=
 224KBUILD_BUILTIN := 1
 225
 226#       If we have only "make modules", don't compile built-in objects.
 227#       When we're building modules with modversions, we need to consider
 228#       the built-in objects during the descend as well, in order to
 229#       make sure the checksums are up to date before we record them.
 230
 231ifeq ($(MAKECMDGOALS),modules)
 232  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 233endif
 234
 235#       If we have "make <whatever> modules", compile modules
 236#       in addition to whatever we do anyway.
 237#       Just "make" or "make all" shall build modules as well
 238
 239ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 240  KBUILD_MODULES := 1
 241endif
 242
 243ifeq ($(MAKECMDGOALS),)
 244  KBUILD_MODULES := 1
 245endif
 246
 247export KBUILD_MODULES KBUILD_BUILTIN
 248export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 249
 250# Beautify output
 251# ---------------------------------------------------------------------------
 252#
 253# Normally, we echo the whole command before executing it. By making
 254# that echo $($(quiet)$(cmd)), we now have the possibility to set
 255# $(quiet) to choose other forms of output instead, e.g.
 256#
 257#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 258#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 259#
 260# If $(quiet) is empty, the whole command will be printed.
 261# If it is set to "quiet_", only the short version will be printed. 
 262# If it is set to "silent_", nothing will be printed at all, since
 263# the variable $(silent_cmd_cc_o_c) doesn't exist.
 264#
 265# A simple variant is to prefix commands with $(Q) - that's useful
 266# for commands that shall be hidden in non-verbose mode.
 267#
 268#       $(Q)ln $@ :<
 269#
 270# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 271# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 272
 273ifeq ($(KBUILD_VERBOSE),1)
 274  quiet =
 275  Q =
 276else
 277  quiet=quiet_
 278  Q = @
 279endif
 280
 281# If the user is running make -s (silent mode), suppress echoing of
 282# commands
 283
 284ifneq ($(findstring s,$(MAKEFLAGS)),)
 285  quiet=silent_
 286endif
 287
 288export quiet Q KBUILD_VERBOSE
 289
 290
 291# Look for make include files relative to root of kernel src
 292MAKEFLAGS += --include-dir=$(srctree)
 293
 294# We need some generic definitions (do not try to remake the file).
 295$(srctree)/scripts/Kbuild.include: ;
 296include $(srctree)/scripts/Kbuild.include
 297
 298# Make variables (CC, etc...)
 299
 300AS              = $(CROSS_COMPILE)as
 301LD              = $(CROSS_COMPILE)ld
 302CC              = $(CROSS_COMPILE)gcc
 303CPP             = $(CC) -E
 304AR              = $(CROSS_COMPILE)ar
 305NM              = $(CROSS_COMPILE)nm
 306STRIP           = $(CROSS_COMPILE)strip
 307OBJCOPY         = $(CROSS_COMPILE)objcopy
 308OBJDUMP         = $(CROSS_COMPILE)objdump
 309AWK             = awk
 310GENKSYMS        = scripts/genksyms/genksyms
 311DEPMOD          = /sbin/depmod
 312KALLSYMS        = scripts/kallsyms
 313PERL            = perl
 314CHECK           = sparse
 315
 316CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
 317MODFLAGS        = -DMODULE
 318CFLAGS_MODULE   = $(MODFLAGS)
 319AFLAGS_MODULE   = $(MODFLAGS)
 320LDFLAGS_MODULE  =
 321CFLAGS_KERNEL   =
 322AFLAGS_KERNEL   =
 323
 324
 325# Use LINUXINCLUDE when you must reference the include/ directory.
 326# Needed to be compatible with the O= option
 327LINUXINCLUDE    := -Iinclude \
 328                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
 329                   -include include/linux/autoconf.h
 330
 331KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 332
 333KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 334                   -fno-strict-aliasing -fno-common \
 335                   -Werror-implicit-function-declaration
 336KBUILD_AFLAGS   := -D__ASSEMBLY__
 337
 338# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 339KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 340KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 341
 342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 343export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 344export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 345export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 346
 347export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 348export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 349export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 350
 351# When compiling out-of-tree modules, put MODVERDIR in the module
 352# tree rather than in the kernel tree. The kernel tree might
 353# even be read-only.
 354export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 355
 356# Files to ignore in find ... statements
 357
 358RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 359export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 360
 361# ===========================================================================
 362# Rules shared between *config targets and build targets
 363
 364# Basic helpers built in scripts/
 365PHONY += scripts_basic
 366scripts_basic:
 367        $(Q)$(MAKE) $(build)=scripts/basic
 368
 369# To avoid any implicit rule to kick in, define an empty command.
 370scripts/basic/%: scripts_basic ;
 371
 372PHONY += outputmakefile
 373# outputmakefile generates a Makefile in the output directory, if using a
 374# separate output directory. This allows convenient use of make in the
 375# output directory.
 376outputmakefile:
 377ifneq ($(KBUILD_SRC),)
 378        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 379            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 380endif
 381
 382# To make sure we do not include .config for any of the *config targets
 383# catch them early, and hand them over to scripts/kconfig/Makefile
 384# It is allowed to specify more targets when calling make, including
 385# mixing *config targets and build targets.
 386# For example 'make oldconfig all'.
 387# Detect when mixed targets is specified, and make a second invocation
 388# of make so .config is not included in this case either (for *config).
 389
 390no-dot-config-targets := clean mrproper distclean \
 391                         cscope TAGS tags help %docs check% \
 392                         include/linux/version.h headers_% \
 393                         kernelrelease kernelversion
 394
 395config-targets := 0
 396mixed-targets  := 0
 397dot-config     := 1
 398
 399ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 400        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 401                dot-config := 0
 402        endif
 403endif
 404
 405ifeq ($(KBUILD_EXTMOD),)
 406        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 407                config-targets := 1
 408                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 409                        mixed-targets := 1
 410                endif
 411        endif
 412endif
 413
 414ifeq ($(mixed-targets),1)
 415# ===========================================================================
 416# We're called with mixed targets (*config and build targets).
 417# Handle them one by one.
 418
 419%:: FORCE
 420        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 421
 422else
 423ifeq ($(config-targets),1)
 424# ===========================================================================
 425# *config targets only - make sure prerequisites are updated, and descend
 426# in scripts/kconfig to make the *config target
 427
 428# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 429# KBUILD_DEFCONFIG may point out an alternative default configuration
 430# used for 'make defconfig'
 431include $(srctree)/arch/$(SRCARCH)/Makefile
 432export KBUILD_DEFCONFIG
 433
 434config %config: scripts_basic outputmakefile FORCE
 435        $(Q)mkdir -p include/linux include/config
 436        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 437
 438else
 439# ===========================================================================
 440# Build targets only - this includes vmlinux, arch specific targets, clean
 441# targets and others. In general all targets except *config targets.
 442
 443ifeq ($(KBUILD_EXTMOD),)
 444# Additional helpers built in scripts/
 445# Carefully list dependencies so we do not try to build scripts twice
 446# in parallel
 447PHONY += scripts
 448scripts: scripts_basic include/config/auto.conf
 449        $(Q)$(MAKE) $(build)=$(@)
 450
 451# Objects we will link into vmlinux / subdirs we need to visit
 452init-y          := init/
 453drivers-y       := drivers/ sound/
 454net-y           := net/
 455libs-y          := lib/
 456core-y          := usr/
 457endif # KBUILD_EXTMOD
 458
 459ifeq ($(dot-config),1)
 460# Read in config
 461-include include/config/auto.conf
 462
 463ifeq ($(KBUILD_EXTMOD),)
 464# Read in dependencies to all Kconfig* files, make sure to run
 465# oldconfig if changes are detected.
 466-include include/config/auto.conf.cmd
 467
 468# To avoid any implicit rule to kick in, define an empty command
 469$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 470
 471# If .config is newer than include/config/auto.conf, someone tinkered
 472# with it and forgot to run make oldconfig.
 473# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 474# we execute the config step to be sure to catch updated Kconfig files
 475include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 476        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 477else
 478# external modules needs include/linux/autoconf.h and include/config/auto.conf
 479# but do not care if they are up-to-date. Use auto.conf to trigger the test
 480PHONY += include/config/auto.conf
 481
 482include/config/auto.conf:
 483        $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
 484        echo;                                                           \
 485        echo "  ERROR: Kernel configuration is invalid.";               \
 486        echo "         include/linux/autoconf.h or $@ are missing.";    \
 487        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
 488        echo;                                                           \
 489        /bin/false)
 490
 491endif # KBUILD_EXTMOD
 492
 493else
 494# Dummy target needed, because used as prerequisite
 495include/config/auto.conf: ;
 496endif # $(dot-config)
 497
 498# The all: target is the default when no target is given on the
 499# command line.
 500# This allow a user to issue only 'make' to build a kernel including modules
 501# Defaults vmlinux but it is usually overridden in the arch makefile
 502all: vmlinux
 503
 504ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 505KBUILD_CFLAGS   += -Os
 506else
 507KBUILD_CFLAGS   += -O2
 508endif
 509
 510ifneq (CONFIG_FRAME_WARN,0)
 511KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 512endif
 513
 514# Force gcc to behave correct even for buggy distributions
 515# Arch Makefiles may override this setting
 516KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 517
 518include $(srctree)/arch/$(SRCARCH)/Makefile
 519
 520ifdef CONFIG_FRAME_POINTER
 521KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 522else
 523KBUILD_CFLAGS   += -fomit-frame-pointer
 524endif
 525
 526ifdef CONFIG_DEBUG_INFO
 527KBUILD_CFLAGS   += -g
 528KBUILD_AFLAGS   += -gdwarf-2
 529endif
 530
 531# We trigger additional mismatches with less inlining
 532ifdef CONFIG_DEBUG_SECTION_MISMATCH
 533KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 534endif
 535
 536# arch Makefile may override CC so keep this after arch Makefile is included
 537NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 538CHECKFLAGS     += $(NOSTDINC_FLAGS)
 539
 540# warn about C99 declaration after statement
 541KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 542
 543# disable pointer signed / unsigned warnings in gcc 4.0
 544KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
 545
 546# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 547# But warn user when we do so
 548warn-assign = \
 549$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 550
 551ifneq ($(KCPPFLAGS),)
 552        $(call warn-assign,CPPFLAGS)
 553        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 554endif
 555ifneq ($(KAFLAGS),)
 556        $(call warn-assign,AFLAGS)
 557        KBUILD_AFLAGS += $(KAFLAGS)
 558endif
 559ifneq ($(KCFLAGS),)
 560        $(call warn-assign,CFLAGS)
 561        KBUILD_CFLAGS += $(KCFLAGS)
 562endif
 563
 564# Use --build-id when available.
 565LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 566                              $(call ld-option, -Wl$(comma)--build-id,))
 567LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 568LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 569
 570# Default kernel image to build when no specific target is given.
 571# KBUILD_IMAGE may be overruled on the command line or
 572# set in the environment
 573# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 574# this default value
 575export KBUILD_IMAGE ?= vmlinux
 576
 577#
 578# INSTALL_PATH specifies where to place the updated kernel and system map
 579# images. Default is /boot, but you can set it to other values
 580export  INSTALL_PATH ?= /boot
 581
 582#
 583# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 584# relocations required by build roots.  This is not defined in the
 585# makefile but the argument can be passed to make if needed.
 586#
 587
 588MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 589export MODLIB
 590
 591#
 592#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 593#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 594#  the default option --strip-debug will be used.  Otherwise,
 595#  INSTALL_MOD_STRIP will used as the options to the strip command.
 596
 597ifdef INSTALL_MOD_STRIP
 598ifeq ($(INSTALL_MOD_STRIP),1)
 599mod_strip_cmd = $(STRIP) --strip-debug
 600else
 601mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 602endif # INSTALL_MOD_STRIP=1
 603else
 604mod_strip_cmd = true
 605endif # INSTALL_MOD_STRIP
 606export mod_strip_cmd
 607
 608
 609ifeq ($(KBUILD_EXTMOD),)
 610core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 611
 612vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 613                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 614                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 615
 616vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 617                     $(init-n) $(init-) \
 618                     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 619                     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 620
 621init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 622core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 623drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 624net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 625libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 626libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 627libs-y          := $(libs-y1) $(libs-y2)
 628
 629# Build vmlinux
 630# ---------------------------------------------------------------------------
 631# vmlinux is built from the objects selected by $(vmlinux-init) and
 632# $(vmlinux-main). Most are built-in.o files from top-level directories
 633# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 634# Ordering when linking is important, and $(vmlinux-init) must be first.
 635#
 636# vmlinux
 637#   ^
 638#   |
 639#   +-< $(vmlinux-init)
 640#   |   +--< init/version.o + more
 641#   |
 642#   +--< $(vmlinux-main)
 643#   |    +--< driver/built-in.o mm/built-in.o + more
 644#   |
 645#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 646#
 647# vmlinux version (uname -v) cannot be updated during normal
 648# descending-into-subdirs phase since we do not yet know if we need to
 649# update vmlinux.
 650# Therefore this step is delayed until just before final link of vmlinux -
 651# except in the kallsyms case where it is done just before adding the
 652# symbols to the kernel.
 653#
 654# System.map is generated to document addresses of all kernel symbols
 655
 656vmlinux-init := $(head-y) $(init-y)
 657vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 658vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 659vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 660export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 661
 662# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 663# May be overridden by arch/$(ARCH)/Makefile
 664quiet_cmd_vmlinux__ ?= LD      $@
 665      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 666      -T $(vmlinux-lds) $(vmlinux-init)                          \
 667      --start-group $(vmlinux-main) --end-group                  \
 668      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 669
 670# Generate new vmlinux version
 671quiet_cmd_vmlinux_version = GEN     .version
 672      cmd_vmlinux_version = set -e;                     \
 673        if [ ! -r .version ]; then                      \
 674          rm -f .version;                               \
 675          echo 1 >.version;                             \
 676        else                                            \
 677          mv .version .old_version;                     \
 678          expr 0$$(cat .old_version) + 1 >.version;     \
 679        fi;                                             \
 680        $(MAKE) $(build)=init
 681
 682# Generate System.map
 683quiet_cmd_sysmap = SYSMAP
 684      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 685
 686# Link of vmlinux
 687# If CONFIG_KALLSYMS is set .version is already updated
 688# Generate System.map and verify that the content is consistent
 689# Use + in front of the vmlinux_version rule to silent warning with make -j2
 690# First command is ':' to allow us to use + in front of the rule
 691define rule_vmlinux__
 692        :
 693        $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 694
 695        $(call cmd,vmlinux__)
 696        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 697
 698        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 699          echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 700        $(cmd_sysmap) $@ System.map;                                         \
 701        if [ $$? -ne 0 ]; then                                               \
 702                rm -f $@;                                                    \
 703                /bin/false;                                                  \
 704        fi;
 705        $(verify_kallsyms)
 706endef
 707
 708
 709ifdef CONFIG_KALLSYMS
 710# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 711# It's a three stage process:
 712# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 713#   empty
 714#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 715#   the right size - vmlinux version (uname -v) is updated during this step
 716# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 717#   but due to the added section, some addresses have shifted.
 718#   From here, we generate a correct .tmp_kallsyms2.o
 719# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 720# o Verify that the System.map from vmlinux matches the map from
 721#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 722# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
 723#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 724#   temporary bypass to allow the kernel to be built while the
 725#   maintainers work out what went wrong with kallsyms.
 726
 727ifdef CONFIG_KALLSYMS_EXTRA_PASS
 728last_kallsyms := 3
 729else
 730last_kallsyms := 2
 731endif
 732
 733kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 734
 735define verify_kallsyms
 736        $(Q)$(if $($(quiet)cmd_sysmap),                                      \
 737          echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 738          $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 739        $(Q)cmp -s System.map .tmp_System.map ||                             \
 740                (echo Inconsistent kallsyms data;                            \
 741                 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
 742                 rm .tmp_kallsyms* ; /bin/false )
 743endef
 744
 745# Update vmlinux version before link
 746# Use + in front of this rule to silent warning about make -j1
 747# First command is ':' to allow us to use + in front of this rule
 748cmd_ksym_ld = $(cmd_vmlinux__)
 749define rule_ksym_ld
 750        : 
 751        +$(call cmd,vmlinux_version)
 752        $(call cmd,vmlinux__)
 753        $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 754endef
 755
 756# Generate .S file with all kernel symbols
 757quiet_cmd_kallsyms = KSYM    $@
 758      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 759                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 760
 761.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 762        $(call if_changed_dep,as_o_S)
 763
 764.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 765        $(call cmd,kallsyms)
 766
 767# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 768.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 769        $(call if_changed_rule,ksym_ld)
 770
 771.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 772        $(call if_changed,vmlinux__)
 773
 774.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 775        $(call if_changed,vmlinux__)
 776
 777# Needs to visit scripts/ before $(KALLSYMS) can be used.
 778$(KALLSYMS): scripts ;
 779
 780# Generate some data for debugging strange kallsyms problems
 781debug_kallsyms: .tmp_map$(last_kallsyms)
 782
 783.tmp_map%: .tmp_vmlinux% FORCE
 784        ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 785
 786.tmp_map3: .tmp_map2
 787
 788.tmp_map2: .tmp_map1
 789
 790endif # ifdef CONFIG_KALLSYMS
 791
 792# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 793# relevant sections renamed as per the linker script.
 794quiet_cmd_vmlinux-modpost = LD      $@
 795      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 796         $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 797         $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 798define rule_vmlinux-modpost
 799        :
 800        +$(call cmd,vmlinux-modpost)
 801        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 802        $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 803endef
 804
 805# vmlinux image - including updated kernel symbols
 806vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
 807ifdef CONFIG_HEADERS_CHECK
 808        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 809endif
 810ifdef CONFIG_SAMPLES
 811        $(Q)$(MAKE) $(build)=samples
 812endif
 813        $(call vmlinux-modpost)
 814        $(call if_changed_rule,vmlinux__)
 815        $(Q)rm -f .old_version
 816
 817# build vmlinux.o first to catch section mismatch errors early
 818ifdef CONFIG_KALLSYMS
 819.tmp_vmlinux1: vmlinux.o
 820endif
 821
 822modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 823vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 824        $(call if_changed_rule,vmlinux-modpost)
 825
 826# The actual objects are generated when descending, 
 827# make sure no implicit rule kicks in
 828$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 829
 830# Handle descending into subdirectories listed in $(vmlinux-dirs)
 831# Preset locale variables to speed up the build process. Limit locale
 832# tweaks to this spot to avoid wrong language settings when running
 833# make menuconfig etc.
 834# Error messages still appears in the original language
 835
 836PHONY += $(vmlinux-dirs)
 837$(vmlinux-dirs): prepare scripts
 838        $(Q)$(MAKE) $(build)=$@
 839
 840# Build the kernel release string
 841#
 842# The KERNELRELEASE value built here is stored in the file
 843# include/config/kernel.release, and is used when executing several
 844# make targets, such as "make install" or "make modules_install."
 845#
 846# The eventual kernel release string consists of the following fields,
 847# shown in a hierarchical format to show how smaller parts are concatenated
 848# to form the larger and final value, with values coming from places like
 849# the Makefile, kernel config options, make command line options and/or
 850# SCM tag information.
 851#
 852#       $(KERNELVERSION)
 853#         $(VERSION)                    eg, 2
 854#         $(PATCHLEVEL)                 eg, 6
 855#         $(SUBLEVEL)                   eg, 18
 856#         $(EXTRAVERSION)               eg, -rc6
 857#       $(localver-full)
 858#         $(localver)
 859#           localversion*               (files without backups, containing '~')
 860#           $(CONFIG_LOCALVERSION)      (from kernel config setting)
 861#         $(localver-auto)              (only if CONFIG_LOCALVERSION_AUTO is set)
 862#           ./scripts/setlocalversion   (SCM tag, if one exists)
 863#           $(LOCALVERSION)             (from make command line if provided)
 864#
 865#  Note how the final $(localver-auto) string is included *only* if the
 866# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
 867# moment, only git is supported but other SCMs can edit the script
 868# scripts/setlocalversion and add the appropriate checks as needed.
 869
 870pattern = ".*/localversion[^~]*"
 871string  = $(shell cat /dev/null \
 872           `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
 873
 874localver = $(subst $(space),, $(string) \
 875                              $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
 876
 877# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
 878# and if the SCM is know a tag from the SCM is appended.
 879# The appended tag is determined by the SCM used.
 880#
 881# Currently, only git is supported.
 882# Other SCMs can edit scripts/setlocalversion and add the appropriate
 883# checks as needed.
 884ifdef CONFIG_LOCALVERSION_AUTO
 885        _localver-auto = $(shell $(CONFIG_SHELL) \
 886                          $(srctree)/scripts/setlocalversion $(srctree))
 887        localver-auto  = $(LOCALVERSION)$(_localver-auto)
 888endif
 889
 890localver-full = $(localver)$(localver-auto)
 891
 892# Store (new) KERNELRELASE string in include/config/kernel.release
 893kernelrelease = $(KERNELVERSION)$(localver-full)
 894include/config/kernel.release: include/config/auto.conf FORCE
 895        $(Q)rm -f $@
 896        $(Q)echo $(kernelrelease) > $@
 897
 898
 899# Things we need to do before we recursively start building the kernel
 900# or the modules are listed in "prepare".
 901# A multi level approach is used. prepareN is processed before prepareN-1.
 902# archprepare is used in arch Makefiles and when processed asm symlink,
 903# version.h and scripts_basic is processed / created.
 904
 905# Listed in dependency order
 906PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 907
 908# prepare3 is used to check if we are building in a separate output directory,
 909# and if so do:
 910# 1) Check that make has not been executed in the kernel src $(srctree)
 911# 2) Create the include2 directory, used for the second asm symlink
 912prepare3: include/config/kernel.release
 913ifneq ($(KBUILD_SRC),)
 914        @echo '  Using $(srctree) as source for kernel'
 915        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 916                echo "  $(srctree) is not clean, please run 'make mrproper'";\
 917                echo "  in the '$(srctree)' directory.";\
 918                /bin/false; \
 919        fi;
 920        $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
 921        $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 922endif
 923
 924# prepare2 creates a makefile if using a separate output directory
 925prepare2: prepare3 outputmakefile
 926
 927prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
 928                   include/asm include/config/auto.conf
 929        $(cmd_crmodverdir)
 930
 931archprepare: prepare1 scripts_basic
 932
 933prepare0: archprepare FORCE
 934        $(Q)$(MAKE) $(build)=.
 935        $(Q)$(MAKE) $(build)=. missing-syscalls
 936
 937# All the preparing..
 938prepare: prepare0
 939
 940# Leave this as default for preprocessing vmlinux.lds.S, which is now
 941# done in arch/$(ARCH)/kernel/Makefile
 942
 943export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 944
 945# The asm symlink changes when $(ARCH) changes.
 946# Detect this and ask user to run make mrproper
 947
 948include/asm: FORCE
 949        $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
 950        if [ -L include/asm ]; then                                     \
 951                if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
 952                        echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
 953                        echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
 954                        exit 1;                                         \
 955                fi;                                                     \
 956        else                                                            \
 957                echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
 958                if [ ! -d include ]; then                               \
 959                        mkdir -p include;                               \
 960                fi;                                                     \
 961                ln -fsn asm-$(SRCARCH) $@;                              \
 962        fi
 963
 964# Generate some files
 965# ---------------------------------------------------------------------------
 966
 967# KERNELRELEASE can change from a few different places, meaning version.h
 968# needs to be updated, so this check is forced on all builds
 969
 970uts_len := 64
 971define filechk_utsrelease.h
 972        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
 973          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
 974          exit 1;                                                         \
 975        fi;                                                               \
 976        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
 977endef
 978
 979define filechk_version.h
 980        (echo \#define LINUX_VERSION_CODE $(shell                             \
 981        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
 982        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 983endef
 984
 985include/linux/version.h: $(srctree)/Makefile FORCE
 986        $(call filechk,version.h)
 987
 988include/linux/utsrelease.h: include/config/kernel.release FORCE
 989        $(call filechk,utsrelease.h)
 990
 991# ---------------------------------------------------------------------------
 992
 993PHONY += depend dep
 994depend dep:
 995        @echo '*** Warning: make $@ is unnecessary now.'
 996
 997# ---------------------------------------------------------------------------
 998# Kernel headers
 999INSTALL_HDR_PATH=$(objtree)/usr
1000export INSTALL_HDR_PATH
1001
1002HDRFILTER=generic i386 x86_64
1003HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
1004
1005PHONY += headers_install_all
1006headers_install_all: include/linux/version.h scripts_basic FORCE
1007        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1008        $(Q)for arch in $(HDRARCHES); do \
1009         $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
1010         done
1011
1012PHONY += headers_install
1013headers_install: include/linux/version.h scripts_basic FORCE
1014        @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1015          echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1016          exit 1 ; fi
1017        $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1018        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1019
1020PHONY += headers_check_all
1021headers_check_all: headers_install_all
1022        $(Q)for arch in $(HDRARCHES); do \
1023         $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1024         done
1025
1026PHONY += headers_check
1027headers_check: headers_install
1028        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1029
1030# ---------------------------------------------------------------------------
1031# Modules
1032
1033ifdef CONFIG_MODULES
1034
1035# By default, build modules as well
1036
1037all: modules
1038
1039#       Build modules
1040#
1041#       A module can be listed more than once in obj-m resulting in
1042#       duplicate lines in modules.order files.  Those are removed
1043#       using awk while concatenating to the final file.
1044
1045PHONY += modules
1046modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1047        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1048        @echo '  Building modules, stage 2.';
1049        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1050
1051
1052# Target to prepare building external modules
1053PHONY += modules_prepare
1054modules_prepare: prepare scripts
1055
1056# Target to install modules
1057PHONY += modules_install
1058modules_install: _modinst_ _modinst_post
1059
1060PHONY += _modinst_
1061_modinst_:
1062        @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1063                echo "Warning: you may need to install module-init-tools"; \
1064                echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1065                sleep 1; \
1066        fi
1067        @rm -rf $(MODLIB)/kernel
1068        @rm -f $(MODLIB)/source
1069        @mkdir -p $(MODLIB)/kernel
1070        @ln -s $(srctree) $(MODLIB)/source
1071        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1072                rm -f $(MODLIB)/build ; \
1073                ln -s $(objtree) $(MODLIB)/build ; \
1074        fi
1075        @cp -f $(objtree)/modules.order $(MODLIB)/
1076        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1077
1078# This depmod is only for convenience to give the initial
1079# boot a modules.dep even before / is mounted read-write.  However the
1080# boot script depmod is the master version.
1081PHONY += _modinst_post
1082_modinst_post: _modinst_
1083        $(call cmd,depmod)
1084
1085else # CONFIG_MODULES
1086
1087# Modules not configured
1088# ---------------------------------------------------------------------------
1089
1090modules modules_install: FORCE
1091        @echo
1092        @echo "The present kernel configuration has modules disabled."
1093        @echo "Type 'make config' and enable loadable module support."
1094        @echo "Then build a kernel with module support enabled."
1095        @echo
1096        @exit 1
1097
1098endif # CONFIG_MODULES
1099
1100###
1101# Cleaning is done on three levels.
1102# make clean     Delete most generated files
1103#                Leave enough to build external modules
1104# make mrproper  Delete the current configuration, and all generated files
1105# make distclean Remove editor backup files, patch leftover files and the like
1106
1107# Directories & files removed with 'make clean'
1108CLEAN_DIRS  += $(MODVERDIR)
1109CLEAN_FILES +=  vmlinux System.map \
1110                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1111
1112# Directories & files removed with 'make mrproper'
1113MRPROPER_DIRS  += include/config include2 usr/include
1114MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1115                  include/linux/autoconf.h include/linux/version.h      \
1116                  include/linux/utsrelease.h                            \
1117                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1118                  Module.symvers tags TAGS cscope*
1119
1120# clean - Delete most, but leave enough to build external modules
1121#
1122clean: rm-dirs  := $(CLEAN_DIRS)
1123clean: rm-files := $(CLEAN_FILES)
1124clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1125
1126PHONY += $(clean-dirs) clean archclean
1127$(clean-dirs):
1128        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1129
1130clean: archclean $(clean-dirs)
1131        $(call cmd,rmdirs)
1132        $(call cmd,rmfiles)
1133        @find . $(RCS_FIND_IGNORE) \
1134                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1135                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1136                -o -name '*.symtypes' -o -name 'modules.order' \
1137                -o -name 'Module.markers' \) \
1138                -type f -print | xargs rm -f
1139
1140# mrproper - Delete all generated files, including .config
1141#
1142mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1143mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1144mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1145
1146PHONY += $(mrproper-dirs) mrproper archmrproper
1147$(mrproper-dirs):
1148        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1149
1150mrproper: clean archmrproper $(mrproper-dirs)
1151        $(call cmd,rmdirs)
1152        $(call cmd,rmfiles)
1153
1154# distclean
1155#
1156PHONY += distclean
1157
1158distclean: mrproper
1159        @find $(srctree) $(RCS_FIND_IGNORE) \
1160                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1161                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1162                -o -name '.*.rej' -o -size 0 \
1163                -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1164                -type f -print | xargs rm -f
1165
1166
1167# Packaging of the kernel to various formats
1168# ---------------------------------------------------------------------------
1169# rpm target kept for backward compatibility
1170package-dir     := $(srctree)/scripts/package
1171
1172%pkg: include/config/kernel.release FORCE
1173        $(Q)$(MAKE) $(build)=$(package-dir) $@
1174rpm: include/config/kernel.release FORCE
1175        $(Q)$(MAKE) $(build)=$(package-dir) $@
1176
1177
1178# Brief documentation of the typical targets used
1179# ---------------------------------------------------------------------------
1180
1181boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1182boards := $(notdir $(boards))
1183board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1184board-dirs := $(sort $(notdir $(board-dirs:/=)))
1185
1186help:
1187        @echo  'Cleaning targets:'
1188        @echo  '  clean           - Remove most generated files but keep the config and'
1189        @echo  '                    enough build support to build external modules'
1190        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1191        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1192        @echo  ''
1193        @echo  'Configuration targets:'
1194        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1195        @echo  ''
1196        @echo  'Other generic targets:'
1197        @echo  '  all             - Build all targets marked with [*]'
1198        @echo  '* vmlinux         - Build the bare kernel'
1199        @echo  '* modules         - Build all modules'
1200        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1201        @echo  '  dir/            - Build all files in dir and below'
1202        @echo  '  dir/file.[ois]  - Build specified target only'
1203        @echo  '  dir/file.ko     - Build module including final link'
1204        @echo  '  prepare         - Set up for building external modules'
1205        @echo  '  tags/TAGS       - Generate tags file for editors'
1206        @echo  '  cscope          - Generate cscope index'
1207        @echo  '  kernelrelease   - Output the release version string'
1208        @echo  '  kernelversion   - Output the version stored in Makefile'
1209        @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1210         echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1211         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1212         fi
1213        @echo  ''
1214        @echo  'Static analysers'
1215        @echo  '  checkstack      - Generate a list of stack hogs'
1216        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1217        @echo  '  versioncheck    - Sanity check on version.h usage'
1218        @echo  '  includecheck    - Check for duplicate included header files'
1219        @echo  '  export_report   - List the usages of all exported symbols'
1220        @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1221         echo  '  headers_check   - Sanity check on exported headers'; \
1222         fi
1223        @echo  ''
1224        @echo  'Kernel packaging:'
1225        @$(MAKE) $(build)=$(package-dir) help
1226        @echo  ''
1227        @echo  'Documentation targets:'
1228        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1229        @echo  ''
1230        @echo  'Architecture specific targets ($(SRCARCH)):'
1231        @$(if $(archhelp),$(archhelp),\
1232                echo '  No architecture specific help defined for $(SRCARCH)')
1233        @echo  ''
1234        @$(if $(boards), \
1235                $(foreach b, $(boards), \
1236                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1237                echo '')
1238        @$(if $(board-dirs), \
1239                $(foreach b, $(board-dirs), \
1240                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1241                printf "  %-16s - Show all of the above\\n" help-boards; \
1242                echo '')
1243
1244        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1245        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1246        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1247        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1248        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1249        @echo  ''
1250        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1251        @echo  'For further info see the ./README file'
1252
1253
1254help-board-dirs := $(addprefix help-,$(board-dirs))
1255
1256help-boards: $(help-board-dirs)
1257
1258boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1259
1260$(help-board-dirs): help-%:
1261        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1262        @$(if $(boards-per-dir), \
1263                $(foreach b, $(boards-per-dir), \
1264                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1265                echo '')
1266
1267
1268# Documentation targets
1269# ---------------------------------------------------------------------------
1270%docs: scripts_basic FORCE
1271        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1272
1273else # KBUILD_EXTMOD
1274
1275###
1276# External module support.
1277# When building external modules the kernel used as basis is considered
1278# read-only, and no consistency checks are made and the make
1279# system is not used on the basis kernel. If updates are required
1280# in the basis kernel ordinary make commands (without M=...) must
1281# be used.
1282#
1283# The following are the only valid targets when building external
1284# modules.
1285# make M=dir clean     Delete all automatically generated files
1286# make M=dir modules   Make all modules in specified dir
1287# make M=dir           Same as 'make M=dir modules'
1288# make M=dir modules_install
1289#                      Install the modules built in the module directory
1290#                      Assumes install directory is already created
1291
1292# We are always building modules
1293KBUILD_MODULES := 1
1294PHONY += crmodverdir
1295crmodverdir:
1296        $(cmd_crmodverdir)
1297
1298PHONY += $(objtree)/Module.symvers
1299$(objtree)/Module.symvers:
1300        @test -e $(objtree)/Module.symvers || ( \
1301        echo; \
1302        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1303        echo "           is missing; modules will have no dependencies and modversions."; \
1304        echo )
1305
1306module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1307PHONY += $(module-dirs) modules
1308$(module-dirs): crmodverdir $(objtree)/Module.symvers
1309        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1310
1311modules: $(module-dirs)
1312        @echo '  Building modules, stage 2.';
1313        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1314
1315PHONY += modules_install
1316modules_install: _emodinst_ _emodinst_post
1317
1318install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1319PHONY += _emodinst_
1320_emodinst_:
1321        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1322        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1323
1324PHONY += _emodinst_post
1325_emodinst_post: _emodinst_
1326        $(call cmd,depmod)
1327
1328clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1329
1330PHONY += $(clean-dirs) clean
1331$(clean-dirs):
1332        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1333
1334clean:  rm-dirs := $(MODVERDIR)
1335clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1336clean: $(clean-dirs)
1337        $(call cmd,rmdirs)
1338        $(call cmd,rmfiles)
1339        @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1340                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1341                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1342                -type f -print | xargs rm -f
1343
1344help:
1345        @echo  '  Building external modules.'
1346        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1347        @echo  ''
1348        @echo  '  modules         - default target, build the module(s)'
1349        @echo  '  modules_install - install the module'
1350        @echo  '  clean           - remove generated files in module directory only'
1351        @echo  ''
1352
1353# Dummies...
1354PHONY += prepare scripts
1355prepare: ;
1356scripts: ;
1357endif # KBUILD_EXTMOD
1358
1359# Generate tags for editors
1360# ---------------------------------------------------------------------------
1361
1362#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1363#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1364#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1365
1366ifeq ($(src),$(obj))
1367__srctree =
1368else
1369__srctree = $(srctree)/
1370endif
1371
1372ifeq ($(ALLSOURCE_ARCHS),)
1373ifeq ($(ARCH),um)
1374ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1375else
1376ALLINCLUDE_ARCHS := $(SRCARCH)
1377endif
1378else
1379#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1380ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1381endif
1382
1383ALLSOURCE_ARCHS := $(SRCARCH)
1384
1385define find-sources
1386        ( for arch in $(ALLSOURCE_ARCHS) ; do \
1387               find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1388                    -name $1 -print; \
1389          done ; \
1390          find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1391               -name $1 -print; \
1392          find $(__srctree)include $(RCS_FIND_IGNORE) \
1393               \( -name config -o -name 'asm-*' \) -prune \
1394               -o -name $1 -print; \
1395          for arch in $(ALLINCLUDE_ARCHS) ; do \
1396               find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1397                    -name $1 -print; \
1398          done ; \
1399          find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1400               -name $1 -print; \
1401          find $(__srctree) $(RCS_FIND_IGNORE) \
1402               \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1403               -name $1 -print; \
1404          )
1405endef
1406
1407define all-sources
1408        $(call find-sources,'*.[chS]')
1409endef
1410define all-kconfigs
1411        $(call find-sources,'Kconfig*')
1412endef
1413define all-defconfigs
1414        $(call find-sources,'defconfig')
1415endef
1416
1417define xtags
1418        if $1 --version 2>&1 | grep -iq exuberant; then \
1419            $(all-sources) | xargs $1 -a \
1420                -I __initdata,__exitdata,__acquires,__releases \
1421                -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1422                -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1423                --extra=+f --c-kinds=+px \
1424                --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1425            $(all-kconfigs) | xargs $1 -a \
1426                --langdef=kconfig \
1427                --language-force=kconfig \
1428                --regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1429            $(all-defconfigs) | xargs -r $1 -a \
1430                --langdef=dotconfig \
1431                --language-force=dotconfig \
1432                --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1433        elif $1 --version 2>&1 | grep -iq emacs; then \
1434            $(all-sources) | xargs $1 -a; \
1435            $(all-kconfigs) | xargs $1 -a \
1436                --regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1437            $(all-defconfigs) | xargs -r $1 -a \
1438                --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1439        else \
1440            $(all-sources) | xargs $1 -a; \
1441        fi
1442endef
1443
1444quiet_cmd_cscope-file = FILELST cscope.files
1445      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1446
1447quiet_cmd_cscope = MAKE    cscope.out
1448      cmd_cscope = cscope -b
1449
1450cscope: FORCE
1451        $(call cmd,cscope-file)
1452        $(call cmd,cscope)
1453
1454quiet_cmd_TAGS = MAKE   $@
1455define cmd_TAGS
1456        rm -f $@; \
1457        $(call xtags,etags)
1458endef
1459
1460TAGS: FORCE
1461        $(call cmd,TAGS)
1462
1463quiet_cmd_tags = MAKE   $@
1464define cmd_tags
1465        rm -f $@; \
1466        $(call xtags,ctags)
1467endef
1468
1469tags: FORCE
1470        $(call cmd,tags)
1471
1472
1473# Scripts to check various things for consistency
1474# ---------------------------------------------------------------------------
1475
1476includecheck:
1477        find * $(RCS_FIND_IGNORE) \
1478                -name '*.[hcS]' -type f -print | sort \
1479                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1480
1481versioncheck:
1482        find * $(RCS_FIND_IGNORE) \
1483                -name '*.[hcS]' -type f -print | sort \
1484                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1485
1486namespacecheck:
1487        $(PERL) $(srctree)/scripts/namespace.pl
1488
1489export_report:
1490        $(PERL) $(srctree)/scripts/export_report.pl
1491
1492endif #ifeq ($(config-targets),1)
1493endif #ifeq ($(mixed-targets),1)
1494
1495PHONY += checkstack kernelrelease kernelversion
1496
1497# UML needs a little special treatment here.  It wants to use the host
1498# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1499# else wants $(ARCH), including people doing cross-builds, which means
1500# that $(SUBARCH) doesn't work here.
1501ifeq ($(ARCH), um)
1502CHECKSTACK_ARCH := $(SUBARCH)
1503else
1504CHECKSTACK_ARCH := $(ARCH)
1505endif
1506checkstack:
1507        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1508        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1509
1510kernelrelease:
1511        $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1512        $(error kernelrelease not valid - run 'make prepare' to update it))
1513kernelversion:
1514        @echo $(KERNELVERSION)
1515
1516# Single targets
1517# ---------------------------------------------------------------------------
1518# Single targets are compatible with:
1519# - build with mixed source and output
1520# - build with separate output dir 'make O=...'
1521# - external modules
1522#
1523#  target-dir => where to store outputfile
1524#  build-dir  => directory in kernel source tree to use
1525
1526ifeq ($(KBUILD_EXTMOD),)
1527        build-dir  = $(patsubst %/,%,$(dir $@))
1528        target-dir = $(dir $@)
1529else
1530        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1531        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1532        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1533endif
1534
1535%.s: %.c prepare scripts FORCE
1536        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537%.i: %.c prepare scripts FORCE
1538        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1539%.o: %.c prepare scripts FORCE
1540        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1541%.lst: %.c prepare scripts FORCE
1542        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1543%.s: %.S prepare scripts FORCE
1544        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1545%.o: %.S prepare scripts FORCE
1546        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1547%.symtypes: %.c prepare scripts FORCE
1548        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1549
1550# Modules
1551/ %/: prepare scripts FORCE
1552        $(cmd_crmodverdir)
1553        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1554        $(build)=$(build-dir)
1555%.ko: prepare scripts FORCE
1556        $(cmd_crmodverdir)
1557        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1558        $(build)=$(build-dir) $(@:.ko=.o)
1559        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1560
1561# FIXME Should go into a make.lib or something 
1562# ===========================================================================
1563
1564quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1565      cmd_rmdirs = rm -rf $(rm-dirs)
1566
1567quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1568      cmd_rmfiles = rm -f $(rm-files)
1569
1570# Run depmod only if we have System.map and depmod is executable
1571quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1572      cmd_depmod = \
1573        if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1574                $(DEPMOD) -ae -F System.map                                     \
1575                $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1576                $(KERNELRELEASE);                                               \
1577        fi
1578
1579# Create temporary dir for module support files
1580# clean it up only when building all modules
1581cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1582                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1583
1584a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1585          $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1586          $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1587
1588quiet_cmd_as_o_S = AS      $@
1589cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1590
1591# read all saved command lines
1592
1593targets := $(wildcard $(sort $(targets)))
1594cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1595
1596ifneq ($(cmd_files),)
1597  $(cmd_files): ;       # Do not try to update included dependency files
1598  include $(cmd_files)
1599endif
1600
1601# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1602# Usage:
1603# $(Q)$(MAKE) $(clean)=dir
1604clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1605
1606endif   # skip-makefile
1607
1608PHONY += FORCE
1609FORCE:
1610
1611# Declare the contents of the .PHONY variable as phony.  We keep that
1612# information in a variable se we can use it in if_changed and friends.
1613.PHONY: $(PHONY)
1614