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   1VERSION = 4
   2PATCHLEVEL = 10
   3SUBLEVEL = 1
   4EXTRAVERSION =
   5NAME = Fearless Coyote
   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# o Do not use make's built-in rules and variables
  14#   (this increases performance and avoids hard-to-debug behaviour);
  15# o Look for make include files relative to root of kernel src
  16MAKEFLAGS += -rR --include-dir=$(CURDIR)
  17
  18# Avoid funny character set dependencies
  19unexport LC_ALL
  20LC_COLLATE=C
  21LC_NUMERIC=C
  22export LC_COLLATE LC_NUMERIC
  23
  24# Avoid interference with shell env settings
  25unexport GREP_OPTIONS
  26
  27# We are using a recursive build, so we need to do a little thinking
  28# to get the ordering right.
  29#
  30# Most importantly: sub-Makefiles should only ever modify files in
  31# their own directory. If in some directory we have a dependency on
  32# a file in another dir (which doesn't happen often, but it's often
  33# unavoidable when linking the built-in.o targets which finally
  34# turn into vmlinux), we will call a sub make in that other dir, and
  35# after that we are sure that everything which is in that other dir
  36# is now up to date.
  37#
  38# The only cases where we need to modify files which have global
  39# effects are thus separated out and done before the recursive
  40# descending is started. They are now explicitly listed as the
  41# prepare rule.
  42
  43# Beautify output
  44# ---------------------------------------------------------------------------
  45#
  46# Normally, we echo the whole command before executing it. By making
  47# that echo $($(quiet)$(cmd)), we now have the possibility to set
  48# $(quiet) to choose other forms of output instead, e.g.
  49#
  50#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  51#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  52#
  53# If $(quiet) is empty, the whole command will be printed.
  54# If it is set to "quiet_", only the short version will be printed.
  55# If it is set to "silent_", nothing will be printed at all, since
  56# the variable $(silent_cmd_cc_o_c) doesn't exist.
  57#
  58# A simple variant is to prefix commands with $(Q) - that's useful
  59# for commands that shall be hidden in non-verbose mode.
  60#
  61#       $(Q)ln $@ :<
  62#
  63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  65#
  66# To put more focus on warnings, be less verbose as default
  67# Use 'make V=1' to see the full commands
  68
  69ifeq ("$(origin V)", "command line")
  70  KBUILD_VERBOSE = $(V)
  71endif
  72ifndef KBUILD_VERBOSE
  73  KBUILD_VERBOSE = 0
  74endif
  75
  76ifeq ($(KBUILD_VERBOSE),1)
  77  quiet =
  78  Q =
  79else
  80  quiet=quiet_
  81  Q = @
  82endif
  83
  84# If the user is running make -s (silent mode), suppress echoing of
  85# commands
  86
  87ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  89  quiet=silent_
  90endif
  91else                                    # make-3.8x
  92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  93  quiet=silent_
  94endif
  95endif
  96
  97export quiet Q KBUILD_VERBOSE
  98
  99# kbuild supports saving output files in a separate directory.
 100# To locate output files in a separate directory two syntaxes are supported.
 101# In both cases the working directory must be the root of the kernel src.
 102# 1) O=
 103# Use "make O=dir/to/store/output/files/"
 104#
 105# 2) Set KBUILD_OUTPUT
 106# Set the environment variable KBUILD_OUTPUT to point to the directory
 107# where the output files shall be placed.
 108# export KBUILD_OUTPUT=dir/to/store/output/files/
 109# make
 110#
 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112# variable.
 113
 114# KBUILD_SRC is set on invocation of make in OBJ directory
 115# KBUILD_SRC is not intended to be used by the regular user (for now)
 116ifeq ($(KBUILD_SRC),)
 117
 118# OK, Make called in directory where kernel src resides
 119# Do we want to locate output files in a separate directory?
 120ifeq ("$(origin O)", "command line")
 121  KBUILD_OUTPUT := $(O)
 122endif
 123
 124# That's our default target when none is given on the command line
 125PHONY := _all
 126_all:
 127
 128# Cancel implicit rules on top Makefile
 129$(CURDIR)/Makefile Makefile: ;
 130
 131ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 132  $(error main directory cannot contain spaces nor colons)
 133endif
 134
 135ifneq ($(KBUILD_OUTPUT),)
 136# Invoke a second make in the output directory, passing relevant variables
 137# check that the output directory actually exists
 138saved-output := $(KBUILD_OUTPUT)
 139KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 140                                                                && /bin/pwd)
 141$(if $(KBUILD_OUTPUT),, \
 142     $(error failed to create output directory "$(saved-output)"))
 143
 144PHONY += $(MAKECMDGOALS) sub-make
 145
 146$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 147        @:
 148
 149sub-make:
 150        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 151        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 152
 153# Leave processing to above invocation of make
 154skip-makefile := 1
 155endif # ifneq ($(KBUILD_OUTPUT),)
 156endif # ifeq ($(KBUILD_SRC),)
 157
 158# We process the rest of the Makefile if this is the final invocation of make
 159ifeq ($(skip-makefile),)
 160
 161# Do not print "Entering directory ...",
 162# but we want to display it when entering to the output directory
 163# so that IDEs/editors are able to understand relative filenames.
 164MAKEFLAGS += --no-print-directory
 165
 166# Call a source code checker (by default, "sparse") as part of the
 167# C compilation.
 168#
 169# Use 'make C=1' to enable checking of only re-compiled files.
 170# Use 'make C=2' to enable checking of *all* source files, regardless
 171# of whether they are re-compiled or not.
 172#
 173# See the file "Documentation/sparse.txt" for more details, including
 174# where to get the "sparse" utility.
 175
 176ifeq ("$(origin C)", "command line")
 177  KBUILD_CHECKSRC = $(C)
 178endif
 179ifndef KBUILD_CHECKSRC
 180  KBUILD_CHECKSRC = 0
 181endif
 182
 183# Use make M=dir to specify directory of external module to build
 184# Old syntax make ... SUBDIRS=$PWD is still supported
 185# Setting the environment variable KBUILD_EXTMOD take precedence
 186ifdef SUBDIRS
 187  KBUILD_EXTMOD ?= $(SUBDIRS)
 188endif
 189
 190ifeq ("$(origin M)", "command line")
 191  KBUILD_EXTMOD := $(M)
 192endif
 193
 194# If building an external module we do not care about the all: rule
 195# but instead _all depend on modules
 196PHONY += all
 197ifeq ($(KBUILD_EXTMOD),)
 198_all: all
 199else
 200_all: modules
 201endif
 202
 203ifeq ($(KBUILD_SRC),)
 204        # building in the source tree
 205        srctree := .
 206else
 207        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 208                # building in a subdirectory of the source tree
 209                srctree := ..
 210        else
 211                srctree := $(KBUILD_SRC)
 212        endif
 213endif
 214objtree         := .
 215src             := $(srctree)
 216obj             := $(objtree)
 217
 218VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 219
 220export srctree objtree VPATH
 221
 222# SUBARCH tells the usermode build what the underlying arch is.  That is set
 223# first, and if a usermode build is happening, the "ARCH=um" on the command
 224# line overrides the setting of ARCH below.  If a native build is happening,
 225# then ARCH is assigned, getting whatever value it gets normally, and
 226# SUBARCH is subsequently ignored.
 227
 228SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 229                                  -e s/sun4u/sparc64/ \
 230                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 231                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 232                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 233                                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
 234
 235# Cross compiling and selecting different set of gcc/bin-utils
 236# ---------------------------------------------------------------------------
 237#
 238# When performing cross compilation for other architectures ARCH shall be set
 239# to the target architecture. (See arch/* for the possibilities).
 240# ARCH can be set during invocation of make:
 241# make ARCH=ia64
 242# Another way is to have ARCH set in the environment.
 243# The default ARCH is the host where make is executed.
 244
 245# CROSS_COMPILE specify the prefix used for all executables used
 246# during compilation. Only gcc and related bin-utils executables
 247# are prefixed with $(CROSS_COMPILE).
 248# CROSS_COMPILE can be set on the command line
 249# make CROSS_COMPILE=ia64-linux-
 250# Alternatively CROSS_COMPILE can be set in the environment.
 251# A third alternative is to store a setting in .config so that plain
 252# "make" in the configured kernel build directory always uses that.
 253# Default value for CROSS_COMPILE is not to prefix executables
 254# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 255ARCH            ?= $(SUBARCH)
 256CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 257
 258# Architecture as present in compile.h
 259UTS_MACHINE     := $(ARCH)
 260SRCARCH         := $(ARCH)
 261
 262# Additional ARCH settings for x86
 263ifeq ($(ARCH),i386)
 264        SRCARCH := x86
 265endif
 266ifeq ($(ARCH),x86_64)
 267        SRCARCH := x86
 268endif
 269
 270# Additional ARCH settings for sparc
 271ifeq ($(ARCH),sparc32)
 272       SRCARCH := sparc
 273endif
 274ifeq ($(ARCH),sparc64)
 275       SRCARCH := sparc
 276endif
 277
 278# Additional ARCH settings for sh
 279ifeq ($(ARCH),sh64)
 280       SRCARCH := sh
 281endif
 282
 283# Additional ARCH settings for tile
 284ifeq ($(ARCH),tilepro)
 285       SRCARCH := tile
 286endif
 287ifeq ($(ARCH),tilegx)
 288       SRCARCH := tile
 289endif
 290
 291# Where to locate arch specific headers
 292hdr-arch  := $(SRCARCH)
 293
 294KCONFIG_CONFIG  ?= .config
 295export KCONFIG_CONFIG
 296
 297# SHELL used by kbuild
 298CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 299          else if [ -x /bin/bash ]; then echo /bin/bash; \
 300          else echo sh; fi ; fi)
 301
 302HOSTCC       = gcc
 303HOSTCXX      = g++
 304HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 305HOSTCXXFLAGS = -O2
 306
 307ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 308HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
 309                -Wno-missing-field-initializers -fno-delete-null-pointer-checks
 310endif
 311
 312# Decide whether to build built-in, modular, or both.
 313# Normally, just do built-in.
 314
 315KBUILD_MODULES :=
 316KBUILD_BUILTIN := 1
 317
 318# If we have only "make modules", don't compile built-in objects.
 319# When we're building modules with modversions, we need to consider
 320# the built-in objects during the descend as well, in order to
 321# make sure the checksums are up to date before we record them.
 322
 323ifeq ($(MAKECMDGOALS),modules)
 324  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 325endif
 326
 327# If we have "make <whatever> modules", compile modules
 328# in addition to whatever we do anyway.
 329# Just "make" or "make all" shall build modules as well
 330
 331ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 332  KBUILD_MODULES := 1
 333endif
 334
 335ifeq ($(MAKECMDGOALS),)
 336  KBUILD_MODULES := 1
 337endif
 338
 339export KBUILD_MODULES KBUILD_BUILTIN
 340export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 341
 342# We need some generic definitions (do not try to remake the file).
 343scripts/Kbuild.include: ;
 344include scripts/Kbuild.include
 345
 346# Make variables (CC, etc...)
 347AS              = $(CROSS_COMPILE)as
 348LD              = $(CROSS_COMPILE)ld
 349CC              = $(CROSS_COMPILE)gcc
 350CPP             = $(CC) -E
 351AR              = $(CROSS_COMPILE)ar
 352NM              = $(CROSS_COMPILE)nm
 353STRIP           = $(CROSS_COMPILE)strip
 354OBJCOPY         = $(CROSS_COMPILE)objcopy
 355OBJDUMP         = $(CROSS_COMPILE)objdump
 356AWK             = awk
 357GENKSYMS        = scripts/genksyms/genksyms
 358INSTALLKERNEL  := installkernel
 359DEPMOD          = /sbin/depmod
 360PERL            = perl
 361PYTHON          = python
 362CHECK           = sparse
 363
 364CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 365                  -Wbitwise -Wno-return-void $(CF)
 366NOSTDINC_FLAGS  =
 367CFLAGS_MODULE   =
 368AFLAGS_MODULE   =
 369LDFLAGS_MODULE  =
 370CFLAGS_KERNEL   =
 371AFLAGS_KERNEL   =
 372LDFLAGS_vmlinux =
 373CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
 374CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 375
 376
 377# Use USERINCLUDE when you must reference the UAPI directories only.
 378USERINCLUDE    := \
 379                -I$(srctree)/arch/$(hdr-arch)/include/uapi \
 380                -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 381                -I$(srctree)/include/uapi \
 382                -I$(objtree)/include/generated/uapi \
 383                -include $(srctree)/include/linux/kconfig.h
 384
 385# Use LINUXINCLUDE when you must reference the include/ directory.
 386# Needed to be compatible with the O= option
 387LINUXINCLUDE    := \
 388                -I$(srctree)/arch/$(hdr-arch)/include \
 389                -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
 390                -I$(objtree)/arch/$(hdr-arch)/include/generated \
 391                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 392                -I$(objtree)/include
 393
 394LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
 395
 396KBUILD_CPPFLAGS := -D__KERNEL__
 397
 398KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 399                   -fno-strict-aliasing -fno-common \
 400                   -Werror-implicit-function-declaration \
 401                   -Wno-format-security \
 402                   -std=gnu89 $(call cc-option,-fno-PIE)
 403
 404
 405KBUILD_AFLAGS_KERNEL :=
 406KBUILD_CFLAGS_KERNEL :=
 407KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
 408KBUILD_AFLAGS_MODULE  := -DMODULE
 409KBUILD_CFLAGS_MODULE  := -DMODULE
 410KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 411
 412# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 413KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 414KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 415
 416export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 417export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 418export CPP AR NM STRIP OBJCOPY OBJDUMP
 419export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 420export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 421
 422export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 423export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
 424export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 425export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 426export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 427export KBUILD_ARFLAGS
 428
 429# When compiling out-of-tree modules, put MODVERDIR in the module
 430# tree rather than in the kernel tree. The kernel tree might
 431# even be read-only.
 432export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 433
 434# Files to ignore in find ... statements
 435
 436export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 437                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 438                          -prune -o
 439export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 440                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 441
 442# ===========================================================================
 443# Rules shared between *config targets and build targets
 444
 445# Basic helpers built in scripts/
 446PHONY += scripts_basic
 447scripts_basic:
 448        $(Q)$(MAKE) $(build)=scripts/basic
 449        $(Q)rm -f .tmp_quiet_recordmcount
 450
 451# To avoid any implicit rule to kick in, define an empty command.
 452scripts/basic/%: scripts_basic ;
 453
 454PHONY += outputmakefile
 455# outputmakefile generates a Makefile in the output directory, if using a
 456# separate output directory. This allows convenient use of make in the
 457# output directory.
 458outputmakefile:
 459ifneq ($(KBUILD_SRC),)
 460        $(Q)ln -fsn $(srctree) source
 461        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 462            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 463endif
 464
 465# Support for using generic headers in asm-generic
 466PHONY += asm-generic
 467asm-generic:
 468        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 469                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
 470        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 471                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
 472
 473# To make sure we do not include .config for any of the *config targets
 474# catch them early, and hand them over to scripts/kconfig/Makefile
 475# It is allowed to specify more targets when calling make, including
 476# mixing *config targets and build targets.
 477# For example 'make oldconfig all'.
 478# Detect when mixed targets is specified, and make a second invocation
 479# of make so .config is not included in this case either (for *config).
 480
 481version_h := include/generated/uapi/linux/version.h
 482old_version_h := include/linux/version.h
 483
 484no-dot-config-targets := clean mrproper distclean \
 485                         cscope gtags TAGS tags help% %docs check% coccicheck \
 486                         $(version_h) headers_% archheaders archscripts \
 487                         kernelversion %src-pkg
 488
 489config-targets := 0
 490mixed-targets  := 0
 491dot-config     := 1
 492
 493ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 494        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 495                dot-config := 0
 496        endif
 497endif
 498
 499ifeq ($(KBUILD_EXTMOD),)
 500        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 501                config-targets := 1
 502                ifneq ($(words $(MAKECMDGOALS)),1)
 503                        mixed-targets := 1
 504                endif
 505        endif
 506endif
 507# install and module_install need also be processed one by one
 508ifneq ($(filter install,$(MAKECMDGOALS)),)
 509        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 510                mixed-targets := 1
 511        endif
 512endif
 513
 514ifeq ($(mixed-targets),1)
 515# ===========================================================================
 516# We're called with mixed targets (*config and build targets).
 517# Handle them one by one.
 518
 519PHONY += $(MAKECMDGOALS) __build_one_by_one
 520
 521$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 522        @:
 523
 524__build_one_by_one:
 525        $(Q)set -e; \
 526        for i in $(MAKECMDGOALS); do \
 527                $(MAKE) -f $(srctree)/Makefile $$i; \
 528        done
 529
 530else
 531ifeq ($(config-targets),1)
 532# ===========================================================================
 533# *config targets only - make sure prerequisites are updated, and descend
 534# in scripts/kconfig to make the *config target
 535
 536# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 537# KBUILD_DEFCONFIG may point out an alternative default configuration
 538# used for 'make defconfig'
 539include arch/$(SRCARCH)/Makefile
 540export KBUILD_DEFCONFIG KBUILD_KCONFIG
 541
 542config: scripts_basic outputmakefile FORCE
 543        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 544
 545%config: scripts_basic outputmakefile FORCE
 546        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 547
 548else
 549# ===========================================================================
 550# Build targets only - this includes vmlinux, arch specific targets, clean
 551# targets and others. In general all targets except *config targets.
 552
 553ifeq ($(KBUILD_EXTMOD),)
 554# Additional helpers built in scripts/
 555# Carefully list dependencies so we do not try to build scripts twice
 556# in parallel
 557PHONY += scripts
 558scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 559         asm-generic gcc-plugins
 560        $(Q)$(MAKE) $(build)=$(@)
 561
 562# Objects we will link into vmlinux / subdirs we need to visit
 563init-y          := init/
 564drivers-y       := drivers/ sound/ firmware/
 565net-y           := net/
 566libs-y          := lib/
 567core-y          := usr/
 568virt-y          := virt/
 569endif # KBUILD_EXTMOD
 570
 571ifeq ($(dot-config),1)
 572# Read in config
 573-include include/config/auto.conf
 574
 575ifeq ($(KBUILD_EXTMOD),)
 576# Read in dependencies to all Kconfig* files, make sure to run
 577# oldconfig if changes are detected.
 578-include include/config/auto.conf.cmd
 579
 580# To avoid any implicit rule to kick in, define an empty command
 581$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 582
 583# If .config is newer than include/config/auto.conf, someone tinkered
 584# with it and forgot to run make oldconfig.
 585# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 586# we execute the config step to be sure to catch updated Kconfig files
 587include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 588        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 589else
 590# external modules needs include/generated/autoconf.h and include/config/auto.conf
 591# but do not care if they are up-to-date. Use auto.conf to trigger the test
 592PHONY += include/config/auto.conf
 593
 594include/config/auto.conf:
 595        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 596        echo >&2;                                                       \
 597        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 598        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 599        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 600        echo >&2 ;                                                      \
 601        /bin/false)
 602
 603endif # KBUILD_EXTMOD
 604
 605else
 606# Dummy target needed, because used as prerequisite
 607include/config/auto.conf: ;
 608endif # $(dot-config)
 609
 610# For the kernel to actually contain only the needed exported symbols,
 611# we have to build modules as well to determine what those symbols are.
 612# (this can be evaluated only once include/config/auto.conf has been included)
 613ifdef CONFIG_TRIM_UNUSED_KSYMS
 614  KBUILD_MODULES := 1
 615endif
 616
 617# The all: target is the default when no target is given on the
 618# command line.
 619# This allow a user to issue only 'make' to build a kernel including modules
 620# Defaults to vmlinux, but the arch makefile usually adds further targets
 621all: vmlinux
 622
 623# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 624# values of the respective KBUILD_* variables
 625ARCH_CPPFLAGS :=
 626ARCH_AFLAGS :=
 627ARCH_CFLAGS :=
 628include arch/$(SRCARCH)/Makefile
 629
 630KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 631KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 632
 633ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 634KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 635KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 636endif
 637
 638ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 639KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
 640else
 641ifdef CONFIG_PROFILE_ALL_BRANCHES
 642KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 643else
 644KBUILD_CFLAGS   += -O2
 645endif
 646endif
 647
 648KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 649                        $(call cc-disable-warning,maybe-uninitialized,))
 650
 651# Tell gcc to never replace conditional load with a non-conditional one
 652KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 653
 654include scripts/Makefile.gcc-plugins
 655
 656ifdef CONFIG_READABLE_ASM
 657# Disable optimizations that make assembler listings hard to read.
 658# reorder blocks reorders the control in the function
 659# ipa clone creates specialized cloned functions
 660# partial inlining inlines only parts of functions
 661KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 662                 $(call cc-option,-fno-ipa-cp-clone,) \
 663                 $(call cc-option,-fno-partial-inlining)
 664endif
 665
 666ifneq ($(CONFIG_FRAME_WARN),0)
 667KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 668endif
 669
 670# This selects the stack protector compiler flag. Testing it is delayed
 671# until after .config has been reprocessed, in the prepare-compiler-check
 672# target.
 673ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 674  stackp-flag := -fstack-protector
 675  stackp-name := REGULAR
 676else
 677ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 678  stackp-flag := -fstack-protector-strong
 679  stackp-name := STRONG
 680else
 681  # Force off for distro compilers that enable stack protector by default.
 682  stackp-flag := $(call cc-option, -fno-stack-protector)
 683endif
 684endif
 685# Find arch-specific stack protector compiler sanity-checking script.
 686ifdef CONFIG_CC_STACKPROTECTOR
 687  stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 688  stackp-check := $(wildcard $(stackp-path))
 689endif
 690KBUILD_CFLAGS += $(stackp-flag)
 691
 692ifeq ($(cc-name),clang)
 693KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 694KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
 695KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 696KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 697KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 698# Quiet clang warning: comparison of unsigned expression < 0 is always false
 699KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 700# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 701# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 702# See modpost pattern 2
 703KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 704KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 705else
 706
 707# These warnings generated too much noise in a regular build.
 708# Use make W=1 to enable them (see scripts/Makefile.build)
 709KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 710KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 711endif
 712
 713ifdef CONFIG_FRAME_POINTER
 714KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 715else
 716# Some targets (ARM with Thumb2, for example), can't be built with frame
 717# pointers.  For those, we don't have FUNCTION_TRACER automatically
 718# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 719# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 720# -fomit-frame-pointer with FUNCTION_TRACER.
 721ifndef CONFIG_FUNCTION_TRACER
 722KBUILD_CFLAGS   += -fomit-frame-pointer
 723endif
 724endif
 725
 726KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 727
 728ifdef CONFIG_DEBUG_INFO
 729ifdef CONFIG_DEBUG_INFO_SPLIT
 730KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 731else
 732KBUILD_CFLAGS   += -g
 733endif
 734KBUILD_AFLAGS   += -Wa,-gdwarf-2
 735endif
 736ifdef CONFIG_DEBUG_INFO_DWARF4
 737KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 738endif
 739
 740ifdef CONFIG_DEBUG_INFO_REDUCED
 741KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 742                   $(call cc-option,-fno-var-tracking)
 743endif
 744
 745ifdef CONFIG_FUNCTION_TRACER
 746ifndef CC_FLAGS_FTRACE
 747CC_FLAGS_FTRACE := -pg
 748endif
 749export CC_FLAGS_FTRACE
 750ifdef CONFIG_HAVE_FENTRY
 751CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 752endif
 753KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 754KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 755ifdef CONFIG_DYNAMIC_FTRACE
 756        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 757                BUILD_C_RECORDMCOUNT := y
 758                export BUILD_C_RECORDMCOUNT
 759        endif
 760endif
 761endif
 762
 763# We trigger additional mismatches with less inlining
 764ifdef CONFIG_DEBUG_SECTION_MISMATCH
 765KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 766endif
 767
 768# arch Makefile may override CC so keep this after arch Makefile is included
 769NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 770CHECKFLAGS     += $(NOSTDINC_FLAGS)
 771
 772# warn about C99 declaration after statement
 773KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 774
 775# disable pointer signed / unsigned warnings in gcc 4.0
 776KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 777
 778# disable invalid "can't wrap" optimizations for signed / pointers
 779KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 780
 781# conserve stack if available
 782KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 783
 784# disallow errors like 'EXPORT_GPL(foo);' with missing header
 785KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 786
 787# require functions to have arguments in prototypes, not empty 'int foo()'
 788KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 789
 790# Prohibit date/time macros, which would make the build non-deterministic
 791KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 792
 793# enforce correct pointer usage
 794KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 795
 796# use the deterministic mode of AR if available
 797KBUILD_ARFLAGS := $(call ar-option,D)
 798
 799# check for 'asm goto'
 800ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 801        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 802        KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 803endif
 804
 805include scripts/Makefile.kasan
 806include scripts/Makefile.extrawarn
 807include scripts/Makefile.ubsan
 808
 809# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 810# last assignments
 811KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 812KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 813KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 814
 815# Use --build-id when available.
 816LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 817                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 818KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 819LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 820
 821ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 822LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 823endif
 824
 825ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 826LDFLAGS_vmlinux += $(call ld-option, -X,)
 827endif
 828
 829# Default kernel image to build when no specific target is given.
 830# KBUILD_IMAGE may be overruled on the command line or
 831# set in the environment
 832# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 833# this default value
 834export KBUILD_IMAGE ?= vmlinux
 835
 836#
 837# INSTALL_PATH specifies where to place the updated kernel and system map
 838# images. Default is /boot, but you can set it to other values
 839export  INSTALL_PATH ?= /boot
 840
 841#
 842# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 843# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 844# an argument if needed. Otherwise it defaults to the kernel install path
 845#
 846export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 847
 848#
 849# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 850# relocations required by build roots.  This is not defined in the
 851# makefile but the argument can be passed to make if needed.
 852#
 853
 854MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 855export MODLIB
 856
 857#
 858# INSTALL_MOD_STRIP, if defined, will cause modules to be
 859# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 860# the default option --strip-debug will be used.  Otherwise,
 861# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 862
 863ifdef INSTALL_MOD_STRIP
 864ifeq ($(INSTALL_MOD_STRIP),1)
 865mod_strip_cmd = $(STRIP) --strip-debug
 866else
 867mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 868endif # INSTALL_MOD_STRIP=1
 869else
 870mod_strip_cmd = true
 871endif # INSTALL_MOD_STRIP
 872export mod_strip_cmd
 873
 874# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 875# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 876# or CONFIG_MODULE_COMPRESS_XZ.
 877
 878mod_compress_cmd = true
 879ifdef CONFIG_MODULE_COMPRESS
 880  ifdef CONFIG_MODULE_COMPRESS_GZIP
 881    mod_compress_cmd = gzip -n -f
 882  endif # CONFIG_MODULE_COMPRESS_GZIP
 883  ifdef CONFIG_MODULE_COMPRESS_XZ
 884    mod_compress_cmd = xz -f
 885  endif # CONFIG_MODULE_COMPRESS_XZ
 886endif # CONFIG_MODULE_COMPRESS
 887export mod_compress_cmd
 888
 889# Select initial ramdisk compression format, default is gzip(1).
 890# This shall be used by the dracut(8) tool while creating an initramfs image.
 891#
 892INITRD_COMPRESS-y                  := gzip
 893INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 894INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 895INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 896INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 897INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 898# do not export INITRD_COMPRESS, since we didn't actually
 899# choose a sane default compression above.
 900# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 901
 902ifdef CONFIG_MODULE_SIG_ALL
 903$(eval $(call config_filename,MODULE_SIG_KEY))
 904
 905mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 906else
 907mod_sign_cmd = true
 908endif
 909export mod_sign_cmd
 910
 911
 912ifeq ($(KBUILD_EXTMOD),)
 913core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 914
 915vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 916                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 917                     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 918
 919vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 920                     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 921
 922init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 923core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 924drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 925net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 926libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 927libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
 928libs-y          := $(libs-y1) $(libs-y2)
 929virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 930
 931# Externally visible symbols (used by link-vmlinux.sh)
 932export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 933export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
 934export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 935export LDFLAGS_vmlinux
 936# used by scripts/pacmage/Makefile
 937export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 938
 939vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
 940
 941# Include targets which we want to execute sequentially if the rest of the
 942# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 943# evaluated more than once.
 944PHONY += vmlinux_prereq
 945vmlinux_prereq: $(vmlinux-deps) FORCE
 946ifdef CONFIG_HEADERS_CHECK
 947        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 948endif
 949ifdef CONFIG_GDB_SCRIPTS
 950        $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 951endif
 952ifdef CONFIG_TRIM_UNUSED_KSYMS
 953        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 954          "$(MAKE) -f $(srctree)/Makefile vmlinux"
 955endif
 956
 957# standalone target for easier testing
 958include/generated/autoksyms.h: FORCE
 959        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 960
 961ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 962
 963# Final link of vmlinux with optional arch pass after final link
 964    cmd_link-vmlinux =                                                 \
 965        $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
 966        $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 967
 968vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
 969        +$(call if_changed,link-vmlinux)
 970
 971# Build samples along the rest of the kernel
 972ifdef CONFIG_SAMPLES
 973vmlinux-dirs += samples
 974endif
 975
 976# The actual objects are generated when descending,
 977# make sure no implicit rule kicks in
 978$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 979
 980# Handle descending into subdirectories listed in $(vmlinux-dirs)
 981# Preset locale variables to speed up the build process. Limit locale
 982# tweaks to this spot to avoid wrong language settings when running
 983# make menuconfig etc.
 984# Error messages still appears in the original language
 985
 986PHONY += $(vmlinux-dirs)
 987$(vmlinux-dirs): prepare scripts
 988        $(Q)$(MAKE) $(build)=$@
 989
 990define filechk_kernel.release
 991        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 992endef
 993
 994# Store (new) KERNELRELEASE string in include/config/kernel.release
 995include/config/kernel.release: include/config/auto.conf FORCE
 996        $(call filechk,kernel.release)
 997
 998
 999# Things we need to do before we recursively start building the kernel
1000# or the modules are listed in "prepare".
1001# A multi level approach is used. prepareN is processed before prepareN-1.
1002# archprepare is used in arch Makefiles and when processed asm symlink,
1003# version.h and scripts_basic is processed / created.
1004
1005# Listed in dependency order
1006PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1007
1008# prepare3 is used to check if we are building in a separate output directory,
1009# and if so do:
1010# 1) Check that make has not been executed in the kernel src $(srctree)
1011prepare3: include/config/kernel.release
1012ifneq ($(KBUILD_SRC),)
1013        @$(kecho) '  Using $(srctree) as source for kernel'
1014        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1015                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1016                echo >&2 "  in the '$(srctree)' directory.";\
1017                /bin/false; \
1018        fi;
1019endif
1020
1021# prepare2 creates a makefile if using a separate output directory.
1022# From this point forward, .config has been reprocessed, so any rules
1023# that need to depend on updated CONFIG_* values can be checked here.
1024prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1025
1026prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1027                   include/config/auto.conf
1028        $(cmd_crmodverdir)
1029
1030archprepare: archheaders archscripts prepare1 scripts_basic
1031
1032prepare0: archprepare gcc-plugins
1033        $(Q)$(MAKE) $(build)=.
1034
1035# All the preparing..
1036prepare: prepare0 prepare-objtool
1037
1038ifdef CONFIG_STACK_VALIDATION
1039  has_libelf := $(call try-run,\
1040                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1041  ifeq ($(has_libelf),1)
1042    objtool_target := tools/objtool FORCE
1043  else
1044    $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1045    SKIP_STACK_VALIDATION := 1
1046    export SKIP_STACK_VALIDATION
1047  endif
1048endif
1049
1050PHONY += prepare-objtool
1051prepare-objtool: $(objtool_target)
1052
1053# Check for CONFIG flags that require compiler support. Abort the build
1054# after .config has been processed, but before the kernel build starts.
1055#
1056# For security-sensitive CONFIG options, we don't want to fallback and/or
1057# silently change which compiler flags will be used, since that leads to
1058# producing kernels with different security feature characteristics
1059# depending on the compiler used. (For example, "But I selected
1060# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1061PHONY += prepare-compiler-check
1062prepare-compiler-check: FORCE
1063# Make sure compiler supports requested stack protector flag.
1064ifdef stackp-name
1065  ifeq ($(call cc-option, $(stackp-flag)),)
1066        @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1067                  $(stackp-flag) not supported by compiler >&2 && exit 1
1068  endif
1069endif
1070# Make sure compiler does not have buggy stack-protector support.
1071ifdef stackp-check
1072  ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1073        @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1074                  $(stackp-flag) available but compiler is broken >&2 && exit 1
1075  endif
1076endif
1077        @:
1078
1079# Generate some files
1080# ---------------------------------------------------------------------------
1081
1082# KERNELRELEASE can change from a few different places, meaning version.h
1083# needs to be updated, so this check is forced on all builds
1084
1085uts_len := 64
1086define filechk_utsrelease.h
1087        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1088          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1089          exit 1;                                                         \
1090        fi;                                                               \
1091        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1092endef
1093
1094define filechk_version.h
1095        (echo \#define LINUX_VERSION_CODE $(shell                         \
1096        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1097        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1098endef
1099
1100$(version_h): $(srctree)/Makefile FORCE
1101        $(call filechk,version.h)
1102        $(Q)rm -f $(old_version_h)
1103
1104include/generated/utsrelease.h: include/config/kernel.release FORCE
1105        $(call filechk,utsrelease.h)
1106
1107PHONY += headerdep
1108headerdep:
1109        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1110        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1111
1112# ---------------------------------------------------------------------------
1113# Firmware install
1114INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1115export INSTALL_FW_PATH
1116
1117PHONY += firmware_install
1118firmware_install:
1119        @mkdir -p $(objtree)/firmware
1120        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1121
1122# ---------------------------------------------------------------------------
1123# Kernel headers
1124
1125#Default location for installed headers
1126export INSTALL_HDR_PATH = $(objtree)/usr
1127
1128# If we do an all arch process set dst to asm-$(hdr-arch)
1129hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1130
1131PHONY += archheaders
1132archheaders:
1133
1134PHONY += archscripts
1135archscripts:
1136
1137PHONY += __headers
1138__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1139        $(Q)$(MAKE) $(build)=scripts build_unifdef
1140
1141PHONY += headers_install_all
1142headers_install_all:
1143        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1144
1145PHONY += headers_install
1146headers_install: __headers
1147        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1148          $(error Headers not exportable for the $(SRCARCH) architecture))
1149        $(Q)$(MAKE) $(hdr-inst)=include/uapi
1150        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1151
1152PHONY += headers_check_all
1153headers_check_all: headers_install_all
1154        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1155
1156PHONY += headers_check
1157headers_check: headers_install
1158        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1159        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1160
1161# ---------------------------------------------------------------------------
1162# Kernel selftest
1163
1164PHONY += kselftest
1165kselftest:
1166        $(Q)$(MAKE) -C tools/testing/selftests run_tests
1167
1168kselftest-clean:
1169        $(Q)$(MAKE) -C tools/testing/selftests clean
1170
1171PHONY += kselftest-merge
1172kselftest-merge:
1173        $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1174        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1175                -m $(objtree)/.config \
1176                $(srctree)/tools/testing/selftests/*/config
1177        +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1178
1179# ---------------------------------------------------------------------------
1180# Modules
1181
1182ifdef CONFIG_MODULES
1183
1184# By default, build modules as well
1185
1186all: modules
1187
1188# Build modules
1189#
1190# A module can be listed more than once in obj-m resulting in
1191# duplicate lines in modules.order files.  Those are removed
1192# using awk while concatenating to the final file.
1193
1194PHONY += modules
1195modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1196        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1197        @$(kecho) '  Building modules, stage 2.';
1198        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1199        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1200
1201modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1202        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1203
1204%/modules.builtin: include/config/auto.conf
1205        $(Q)$(MAKE) $(modbuiltin)=$*
1206
1207
1208# Target to prepare building external modules
1209PHONY += modules_prepare
1210modules_prepare: prepare scripts
1211
1212# Target to install modules
1213PHONY += modules_install
1214modules_install: _modinst_ _modinst_post
1215
1216PHONY += _modinst_
1217_modinst_:
1218        @rm -rf $(MODLIB)/kernel
1219        @rm -f $(MODLIB)/source
1220        @mkdir -p $(MODLIB)/kernel
1221        @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1222        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1223                rm -f $(MODLIB)/build ; \
1224                ln -s $(CURDIR) $(MODLIB)/build ; \
1225        fi
1226        @cp -f $(objtree)/modules.order $(MODLIB)/
1227        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1228        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1229
1230# This depmod is only for convenience to give the initial
1231# boot a modules.dep even before / is mounted read-write.  However the
1232# boot script depmod is the master version.
1233PHONY += _modinst_post
1234_modinst_post: _modinst_
1235        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1236        $(call cmd,depmod)
1237
1238ifeq ($(CONFIG_MODULE_SIG), y)
1239PHONY += modules_sign
1240modules_sign:
1241        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1242endif
1243
1244else # CONFIG_MODULES
1245
1246# Modules not configured
1247# ---------------------------------------------------------------------------
1248
1249PHONY += modules modules_install
1250modules modules_install:
1251        @echo >&2
1252        @echo >&2 "The present kernel configuration has modules disabled."
1253        @echo >&2 "Type 'make config' and enable loadable module support."
1254        @echo >&2 "Then build a kernel with module support enabled."
1255        @echo >&2
1256        @exit 1
1257
1258endif # CONFIG_MODULES
1259
1260###
1261# Cleaning is done on three levels.
1262# make clean     Delete most generated files
1263#                Leave enough to build external modules
1264# make mrproper  Delete the current configuration, and all generated files
1265# make distclean Remove editor backup files, patch leftover files and the like
1266
1267# Directories & files removed with 'make clean'
1268CLEAN_DIRS  += $(MODVERDIR)
1269
1270# Directories & files removed with 'make mrproper'
1271MRPROPER_DIRS  += include/config usr/include include/generated          \
1272                  arch/*/include/generated .tmp_objdiff
1273MRPROPER_FILES += .config .config.old .version .old_version \
1274                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1275                  signing_key.pem signing_key.priv signing_key.x509     \
1276                  x509.genkey extra_certificates signing_key.x509.keyid \
1277                  signing_key.x509.signer vmlinux-gdb.py
1278
1279# clean - Delete most, but leave enough to build external modules
1280#
1281clean: rm-dirs  := $(CLEAN_DIRS)
1282clean: rm-files := $(CLEAN_FILES)
1283clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1284
1285PHONY += $(clean-dirs) clean archclean vmlinuxclean
1286$(clean-dirs):
1287        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1288
1289vmlinuxclean:
1290        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1291        $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1292
1293clean: archclean vmlinuxclean
1294
1295# mrproper - Delete all generated files, including .config
1296#
1297mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1298mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1299mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1300
1301PHONY += $(mrproper-dirs) mrproper archmrproper
1302$(mrproper-dirs):
1303        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1304
1305mrproper: clean archmrproper $(mrproper-dirs)
1306        $(call cmd,rmdirs)
1307        $(call cmd,rmfiles)
1308
1309# distclean
1310#
1311PHONY += distclean
1312
1313distclean: mrproper
1314        @find $(srctree) $(RCS_FIND_IGNORE) \
1315                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1316                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1317                -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1318                -type f -print | xargs rm -f
1319
1320
1321# Packaging of the kernel to various formats
1322# ---------------------------------------------------------------------------
1323# rpm target kept for backward compatibility
1324package-dir     := scripts/package
1325
1326%src-pkg: FORCE
1327        $(Q)$(MAKE) $(build)=$(package-dir) $@
1328%pkg: include/config/kernel.release FORCE
1329        $(Q)$(MAKE) $(build)=$(package-dir) $@
1330rpm: include/config/kernel.release FORCE
1331        $(Q)$(MAKE) $(build)=$(package-dir) $@
1332
1333
1334# Brief documentation of the typical targets used
1335# ---------------------------------------------------------------------------
1336
1337boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1338boards := $(sort $(notdir $(boards)))
1339board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1340board-dirs := $(sort $(notdir $(board-dirs:/=)))
1341
1342PHONY += help
1343help:
1344        @echo  'Cleaning targets:'
1345        @echo  '  clean           - Remove most generated files but keep the config and'
1346        @echo  '                    enough build support to build external modules'
1347        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1348        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1349        @echo  ''
1350        @echo  'Configuration targets:'
1351        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1352        @echo  ''
1353        @echo  'Other generic targets:'
1354        @echo  '  all             - Build all targets marked with [*]'
1355        @echo  '* vmlinux         - Build the bare kernel'
1356        @echo  '* modules         - Build all modules'
1357        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1358        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1359        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1360        @echo  '  dir/            - Build all files in dir and below'
1361        @echo  '  dir/file.[ois]  - Build specified target only'
1362        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1363        @echo  '                    (requires a recent binutils and recent build (System.map))'
1364        @echo  '  dir/file.ko     - Build module including final link'
1365        @echo  '  modules_prepare - Set up for building external modules'
1366        @echo  '  tags/TAGS       - Generate tags file for editors'
1367        @echo  '  cscope          - Generate cscope index'
1368        @echo  '  gtags           - Generate GNU GLOBAL index'
1369        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1370        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1371        @echo  '  image_name      - Output the image name (use with make -s)'
1372        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1373         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1374         echo  ''
1375        @echo  'Static analysers'
1376        @echo  '  checkstack      - Generate a list of stack hogs'
1377        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1378        @echo  '  versioncheck    - Sanity check on version.h usage'
1379        @echo  '  includecheck    - Check for duplicate included header files'
1380        @echo  '  export_report   - List the usages of all exported symbols'
1381        @echo  '  headers_check   - Sanity check on exported headers'
1382        @echo  '  headerdep       - Detect inclusion cycles in headers'
1383        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1384        @echo  ''
1385        @echo  'Kernel selftest'
1386        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1387        @echo  '                    Build, install, and boot kernel before'
1388        @echo  '                    running kselftest on it'
1389        @echo  '  kselftest-clean - Remove all generated kselftest files'
1390        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1391        @echo  '                    .config.'
1392        @echo  ''
1393        @echo  'Kernel packaging:'
1394        @$(MAKE) $(build)=$(package-dir) help
1395        @echo  ''
1396        @echo  'Documentation targets:'
1397        @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1398        @echo  ''
1399        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1400        @echo  ''
1401        @echo  'Architecture specific targets ($(SRCARCH)):'
1402        @$(if $(archhelp),$(archhelp),\
1403                echo '  No architecture specific help defined for $(SRCARCH)')
1404        @echo  ''
1405        @$(if $(boards), \
1406                $(foreach b, $(boards), \
1407                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1408                echo '')
1409        @$(if $(board-dirs), \
1410                $(foreach b, $(board-dirs), \
1411                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1412                printf "  %-16s - Show all of the above\\n" help-boards; \
1413                echo '')
1414
1415        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1416        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1417        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1418        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1419        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1420        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1421        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1422        @echo  '                1: warnings which may be relevant and do not occur too often'
1423        @echo  '                2: warnings which occur quite often but may still be relevant'
1424        @echo  '                3: more obscure warnings, can most likely be ignored'
1425        @echo  '                Multiple levels can be combined with W=12 or W=123'
1426        @echo  ''
1427        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1428        @echo  'For further info see the ./README file'
1429
1430
1431help-board-dirs := $(addprefix help-,$(board-dirs))
1432
1433help-boards: $(help-board-dirs)
1434
1435boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1436
1437$(help-board-dirs): help-%:
1438        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1439        @$(if $(boards-per-dir), \
1440                $(foreach b, $(boards-per-dir), \
1441                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1442                echo '')
1443
1444
1445# Documentation targets
1446# ---------------------------------------------------------------------------
1447DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1448PHONY += $(DOC_TARGETS)
1449$(DOC_TARGETS): scripts_basic FORCE
1450        $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1451        $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1452        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1453
1454else # KBUILD_EXTMOD
1455
1456###
1457# External module support.
1458# When building external modules the kernel used as basis is considered
1459# read-only, and no consistency checks are made and the make
1460# system is not used on the basis kernel. If updates are required
1461# in the basis kernel ordinary make commands (without M=...) must
1462# be used.
1463#
1464# The following are the only valid targets when building external
1465# modules.
1466# make M=dir clean     Delete all automatically generated files
1467# make M=dir modules   Make all modules in specified dir
1468# make M=dir           Same as 'make M=dir modules'
1469# make M=dir modules_install
1470#                      Install the modules built in the module directory
1471#                      Assumes install directory is already created
1472
1473# We are always building modules
1474KBUILD_MODULES := 1
1475PHONY += crmodverdir
1476crmodverdir:
1477        $(cmd_crmodverdir)
1478
1479PHONY += $(objtree)/Module.symvers
1480$(objtree)/Module.symvers:
1481        @test -e $(objtree)/Module.symvers || ( \
1482        echo; \
1483        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1484        echo "           is missing; modules will have no dependencies and modversions."; \
1485        echo )
1486
1487module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1488PHONY += $(module-dirs) modules
1489$(module-dirs): crmodverdir $(objtree)/Module.symvers
1490        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1491
1492modules: $(module-dirs)
1493        @$(kecho) '  Building modules, stage 2.';
1494        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1495
1496PHONY += modules_install
1497modules_install: _emodinst_ _emodinst_post
1498
1499install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1500PHONY += _emodinst_
1501_emodinst_:
1502        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1503        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1504
1505PHONY += _emodinst_post
1506_emodinst_post: _emodinst_
1507        $(call cmd,depmod)
1508
1509clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1510
1511PHONY += $(clean-dirs) clean
1512$(clean-dirs):
1513        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1514
1515clean:  rm-dirs := $(MODVERDIR)
1516clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1517
1518PHONY += help
1519help:
1520        @echo  '  Building external modules.'
1521        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1522        @echo  ''
1523        @echo  '  modules         - default target, build the module(s)'
1524        @echo  '  modules_install - install the module'
1525        @echo  '  clean           - remove generated files in module directory only'
1526        @echo  ''
1527
1528# Dummies...
1529PHONY += prepare scripts
1530prepare: ;
1531scripts: ;
1532endif # KBUILD_EXTMOD
1533
1534clean: $(clean-dirs)
1535        $(call cmd,rmdirs)
1536        $(call cmd,rmfiles)
1537        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1538                \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1539                -o -name '*.ko.*' \
1540                -o -name '*.dwo'  \
1541                -o -name '*.su'  \
1542                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1543                -o -name '*.symtypes' -o -name 'modules.order' \
1544                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1545                -o -name '*.c.[012]*.*' \
1546                -o -name '*.gcno' \) -type f -print | xargs rm -f
1547
1548# Generate tags for editors
1549# ---------------------------------------------------------------------------
1550quiet_cmd_tags = GEN     $@
1551      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1552
1553tags TAGS cscope gtags: FORCE
1554        $(call cmd,tags)
1555
1556# Scripts to check various things for consistency
1557# ---------------------------------------------------------------------------
1558
1559PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1560
1561includecheck:
1562        find $(srctree)/* $(RCS_FIND_IGNORE) \
1563                -name '*.[hcS]' -type f -print | sort \
1564                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1565
1566versioncheck:
1567        find $(srctree)/* $(RCS_FIND_IGNORE) \
1568                -name '*.[hcS]' -type f -print | sort \
1569                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1570
1571coccicheck:
1572        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1573
1574namespacecheck:
1575        $(PERL) $(srctree)/scripts/namespace.pl
1576
1577export_report:
1578        $(PERL) $(srctree)/scripts/export_report.pl
1579
1580endif #ifeq ($(config-targets),1)
1581endif #ifeq ($(mixed-targets),1)
1582
1583PHONY += checkstack kernelrelease kernelversion image_name
1584
1585# UML needs a little special treatment here.  It wants to use the host
1586# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1587# else wants $(ARCH), including people doing cross-builds, which means
1588# that $(SUBARCH) doesn't work here.
1589ifeq ($(ARCH), um)
1590CHECKSTACK_ARCH := $(SUBARCH)
1591else
1592CHECKSTACK_ARCH := $(ARCH)
1593endif
1594checkstack:
1595        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1596        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1597
1598kernelrelease:
1599        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1600
1601kernelversion:
1602        @echo $(KERNELVERSION)
1603
1604image_name:
1605        @echo $(KBUILD_IMAGE)
1606
1607# Clear a bunch of variables before executing the submake
1608tools/: FORCE
1609        $(Q)mkdir -p $(objtree)/tools
1610        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1611
1612tools/%: FORCE
1613        $(Q)mkdir -p $(objtree)/tools
1614        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1615
1616# Single targets
1617# ---------------------------------------------------------------------------
1618# Single targets are compatible with:
1619# - build with mixed source and output
1620# - build with separate output dir 'make O=...'
1621# - external modules
1622#
1623#  target-dir => where to store outputfile
1624#  build-dir  => directory in kernel source tree to use
1625
1626ifeq ($(KBUILD_EXTMOD),)
1627        build-dir  = $(patsubst %/,%,$(dir $@))
1628        target-dir = $(dir $@)
1629else
1630        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1631        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1632        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1633endif
1634
1635%.s: %.c prepare scripts FORCE
1636        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1637%.i: %.c prepare scripts FORCE
1638        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1639%.o: %.c prepare scripts FORCE
1640        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1641%.lst: %.c prepare scripts FORCE
1642        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1643%.s: %.S prepare scripts FORCE
1644        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1645%.o: %.S prepare scripts FORCE
1646        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1647%.symtypes: %.c prepare scripts FORCE
1648        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1649
1650# Modules
1651/: prepare scripts FORCE
1652        $(cmd_crmodverdir)
1653        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1654        $(build)=$(build-dir)
1655# Make sure the latest headers are built for Documentation
1656Documentation/ samples/: headers_install
1657%/: prepare scripts FORCE
1658        $(cmd_crmodverdir)
1659        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1660        $(build)=$(build-dir)
1661%.ko: prepare scripts FORCE
1662        $(cmd_crmodverdir)
1663        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1664        $(build)=$(build-dir) $(@:.ko=.o)
1665        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1666
1667# FIXME Should go into a make.lib or something
1668# ===========================================================================
1669
1670quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1671      cmd_rmdirs = rm -rf $(rm-dirs)
1672
1673quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1674      cmd_rmfiles = rm -f $(rm-files)
1675
1676# Run depmod only if we have System.map and depmod is executable
1677quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1678      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1679                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1680
1681# Create temporary dir for module support files
1682# clean it up only when building all modules
1683cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1684                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1685
1686# read all saved command lines
1687
1688targets := $(wildcard $(sort $(targets)))
1689cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1690
1691ifneq ($(cmd_files),)
1692  $(cmd_files): ;       # Do not try to update included dependency files
1693  include $(cmd_files)
1694endif
1695
1696endif   # skip-makefile
1697
1698PHONY += FORCE
1699FORCE:
1700
1701# Declare the contents of the .PHONY variable as phony.  We keep that
1702# information in a variable so we can use it in if_changed and friends.
1703.PHONY: $(PHONY)
1704
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