Back to home page

LXR

 
 

    


0001 VERSION = 4
0002 PATCHLEVEL = 10
0003 SUBLEVEL = 0
0004 EXTRAVERSION =
0005 NAME = Fearless Coyote
0006 
0007 # *DOCUMENTATION*
0008 # To see a list of typical targets execute "make help"
0009 # More info can be located in ./README
0010 # Comments in this file are targeted only to the developer, do not
0011 # expect to learn how to build the kernel reading this file.
0012 
0013 # o Do not use make's built-in rules and variables
0014 #   (this increases performance and avoids hard-to-debug behaviour);
0015 # o Look for make include files relative to root of kernel src
0016 MAKEFLAGS += -rR --include-dir=$(CURDIR)
0017 
0018 # Avoid funny character set dependencies
0019 unexport LC_ALL
0020 LC_COLLATE=C
0021 LC_NUMERIC=C
0022 export LC_COLLATE LC_NUMERIC
0023 
0024 # Avoid interference with shell env settings
0025 unexport GREP_OPTIONS
0026 
0027 # We are using a recursive build, so we need to do a little thinking
0028 # to get the ordering right.
0029 #
0030 # Most importantly: sub-Makefiles should only ever modify files in
0031 # their own directory. If in some directory we have a dependency on
0032 # a file in another dir (which doesn't happen often, but it's often
0033 # unavoidable when linking the built-in.o targets which finally
0034 # turn into vmlinux), we will call a sub make in that other dir, and
0035 # after that we are sure that everything which is in that other dir
0036 # is now up to date.
0037 #
0038 # The only cases where we need to modify files which have global
0039 # effects are thus separated out and done before the recursive
0040 # descending is started. They are now explicitly listed as the
0041 # prepare rule.
0042 
0043 # Beautify output
0044 # ---------------------------------------------------------------------------
0045 #
0046 # Normally, we echo the whole command before executing it. By making
0047 # that echo $($(quiet)$(cmd)), we now have the possibility to set
0048 # $(quiet) to choose other forms of output instead, e.g.
0049 #
0050 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
0051 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
0052 #
0053 # If $(quiet) is empty, the whole command will be printed.
0054 # If it is set to "quiet_", only the short version will be printed.
0055 # If it is set to "silent_", nothing will be printed at all, since
0056 # the variable $(silent_cmd_cc_o_c) doesn't exist.
0057 #
0058 # A simple variant is to prefix commands with $(Q) - that's useful
0059 # for commands that shall be hidden in non-verbose mode.
0060 #
0061 #       $(Q)ln $@ :<
0062 #
0063 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
0064 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
0065 #
0066 # To put more focus on warnings, be less verbose as default
0067 # Use 'make V=1' to see the full commands
0068 
0069 ifeq ("$(origin V)", "command line")
0070   KBUILD_VERBOSE = $(V)
0071 endif
0072 ifndef KBUILD_VERBOSE
0073   KBUILD_VERBOSE = 0
0074 endif
0075 
0076 ifeq ($(KBUILD_VERBOSE),1)
0077   quiet =
0078   Q =
0079 else
0080   quiet=quiet_
0081   Q = @
0082 endif
0083 
0084 # If the user is running make -s (silent mode), suppress echoing of
0085 # commands
0086 
0087 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
0088 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
0089   quiet=silent_
0090 endif
0091 else                                    # make-3.8x
0092 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
0093   quiet=silent_
0094 endif
0095 endif
0096 
0097 export quiet Q KBUILD_VERBOSE
0098 
0099 # kbuild supports saving output files in a separate directory.
0100 # To locate output files in a separate directory two syntaxes are supported.
0101 # In both cases the working directory must be the root of the kernel src.
0102 # 1) O=
0103 # Use "make O=dir/to/store/output/files/"
0104 #
0105 # 2) Set KBUILD_OUTPUT
0106 # Set the environment variable KBUILD_OUTPUT to point to the directory
0107 # where the output files shall be placed.
0108 # export KBUILD_OUTPUT=dir/to/store/output/files/
0109 # make
0110 #
0111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
0112 # variable.
0113 
0114 # KBUILD_SRC is set on invocation of make in OBJ directory
0115 # KBUILD_SRC is not intended to be used by the regular user (for now)
0116 ifeq ($(KBUILD_SRC),)
0117 
0118 # OK, Make called in directory where kernel src resides
0119 # Do we want to locate output files in a separate directory?
0120 ifeq ("$(origin O)", "command line")
0121   KBUILD_OUTPUT := $(O)
0122 endif
0123 
0124 # That's our default target when none is given on the command line
0125 PHONY := _all
0126 _all:
0127 
0128 # Cancel implicit rules on top Makefile
0129 $(CURDIR)/Makefile Makefile: ;
0130 
0131 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
0132   $(error main directory cannot contain spaces nor colons)
0133 endif
0134 
0135 ifneq ($(KBUILD_OUTPUT),)
0136 # Invoke a second make in the output directory, passing relevant variables
0137 # check that the output directory actually exists
0138 saved-output := $(KBUILD_OUTPUT)
0139 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
0140                                                                 && /bin/pwd)
0141 $(if $(KBUILD_OUTPUT),, \
0142      $(error failed to create output directory "$(saved-output)"))
0143 
0144 PHONY += $(MAKECMDGOALS) sub-make
0145 
0146 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
0147         @:
0148 
0149 sub-make:
0150         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
0151         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
0152 
0153 # Leave processing to above invocation of make
0154 skip-makefile := 1
0155 endif # ifneq ($(KBUILD_OUTPUT),)
0156 endif # ifeq ($(KBUILD_SRC),)
0157 
0158 # We process the rest of the Makefile if this is the final invocation of make
0159 ifeq ($(skip-makefile),)
0160 
0161 # Do not print "Entering directory ...",
0162 # but we want to display it when entering to the output directory
0163 # so that IDEs/editors are able to understand relative filenames.
0164 MAKEFLAGS += --no-print-directory
0165 
0166 # Call a source code checker (by default, "sparse") as part of the
0167 # C compilation.
0168 #
0169 # Use 'make C=1' to enable checking of only re-compiled files.
0170 # Use 'make C=2' to enable checking of *all* source files, regardless
0171 # of whether they are re-compiled or not.
0172 #
0173 # See the file "Documentation/sparse.txt" for more details, including
0174 # where to get the "sparse" utility.
0175 
0176 ifeq ("$(origin C)", "command line")
0177   KBUILD_CHECKSRC = $(C)
0178 endif
0179 ifndef KBUILD_CHECKSRC
0180   KBUILD_CHECKSRC = 0
0181 endif
0182 
0183 # Use make M=dir to specify directory of external module to build
0184 # Old syntax make ... SUBDIRS=$PWD is still supported
0185 # Setting the environment variable KBUILD_EXTMOD take precedence
0186 ifdef SUBDIRS
0187   KBUILD_EXTMOD ?= $(SUBDIRS)
0188 endif
0189 
0190 ifeq ("$(origin M)", "command line")
0191   KBUILD_EXTMOD := $(M)
0192 endif
0193 
0194 # If building an external module we do not care about the all: rule
0195 # but instead _all depend on modules
0196 PHONY += all
0197 ifeq ($(KBUILD_EXTMOD),)
0198 _all: all
0199 else
0200 _all: modules
0201 endif
0202 
0203 ifeq ($(KBUILD_SRC),)
0204         # building in the source tree
0205         srctree := .
0206 else
0207         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
0208                 # building in a subdirectory of the source tree
0209                 srctree := ..
0210         else
0211                 srctree := $(KBUILD_SRC)
0212         endif
0213 endif
0214 objtree         := .
0215 src             := $(srctree)
0216 obj             := $(objtree)
0217 
0218 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
0219 
0220 export srctree objtree VPATH
0221 
0222 # SUBARCH tells the usermode build what the underlying arch is.  That is set
0223 # first, and if a usermode build is happening, the "ARCH=um" on the command
0224 # line overrides the setting of ARCH below.  If a native build is happening,
0225 # then ARCH is assigned, getting whatever value it gets normally, and
0226 # SUBARCH is subsequently ignored.
0227 
0228 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
0229                                   -e s/sun4u/sparc64/ \
0230                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
0231                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
0232                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
0233                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
0234 
0235 # Cross compiling and selecting different set of gcc/bin-utils
0236 # ---------------------------------------------------------------------------
0237 #
0238 # When performing cross compilation for other architectures ARCH shall be set
0239 # to the target architecture. (See arch/* for the possibilities).
0240 # ARCH can be set during invocation of make:
0241 # make ARCH=ia64
0242 # Another way is to have ARCH set in the environment.
0243 # The default ARCH is the host where make is executed.
0244 
0245 # CROSS_COMPILE specify the prefix used for all executables used
0246 # during compilation. Only gcc and related bin-utils executables
0247 # are prefixed with $(CROSS_COMPILE).
0248 # CROSS_COMPILE can be set on the command line
0249 # make CROSS_COMPILE=ia64-linux-
0250 # Alternatively CROSS_COMPILE can be set in the environment.
0251 # A third alternative is to store a setting in .config so that plain
0252 # "make" in the configured kernel build directory always uses that.
0253 # Default value for CROSS_COMPILE is not to prefix executables
0254 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
0255 ARCH            ?= $(SUBARCH)
0256 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
0257 
0258 # Architecture as present in compile.h
0259 UTS_MACHINE     := $(ARCH)
0260 SRCARCH         := $(ARCH)
0261 
0262 # Additional ARCH settings for x86
0263 ifeq ($(ARCH),i386)
0264         SRCARCH := x86
0265 endif
0266 ifeq ($(ARCH),x86_64)
0267         SRCARCH := x86
0268 endif
0269 
0270 # Additional ARCH settings for sparc
0271 ifeq ($(ARCH),sparc32)
0272        SRCARCH := sparc
0273 endif
0274 ifeq ($(ARCH),sparc64)
0275        SRCARCH := sparc
0276 endif
0277 
0278 # Additional ARCH settings for sh
0279 ifeq ($(ARCH),sh64)
0280        SRCARCH := sh
0281 endif
0282 
0283 # Additional ARCH settings for tile
0284 ifeq ($(ARCH),tilepro)
0285        SRCARCH := tile
0286 endif
0287 ifeq ($(ARCH),tilegx)
0288        SRCARCH := tile
0289 endif
0290 
0291 # Where to locate arch specific headers
0292 hdr-arch  := $(SRCARCH)
0293 
0294 KCONFIG_CONFIG  ?= .config
0295 export KCONFIG_CONFIG
0296 
0297 # SHELL used by kbuild
0298 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
0299           else if [ -x /bin/bash ]; then echo /bin/bash; \
0300           else echo sh; fi ; fi)
0301 
0302 HOSTCC       = gcc
0303 HOSTCXX      = g++
0304 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
0305 HOSTCXXFLAGS = -O2
0306 
0307 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
0308 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
0309                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
0310 endif
0311 
0312 # Decide whether to build built-in, modular, or both.
0313 # Normally, just do built-in.
0314 
0315 KBUILD_MODULES :=
0316 KBUILD_BUILTIN := 1
0317 
0318 # If we have only "make modules", don't compile built-in objects.
0319 # When we're building modules with modversions, we need to consider
0320 # the built-in objects during the descend as well, in order to
0321 # make sure the checksums are up to date before we record them.
0322 
0323 ifeq ($(MAKECMDGOALS),modules)
0324   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
0325 endif
0326 
0327 # If we have "make <whatever> modules", compile modules
0328 # in addition to whatever we do anyway.
0329 # Just "make" or "make all" shall build modules as well
0330 
0331 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
0332   KBUILD_MODULES := 1
0333 endif
0334 
0335 ifeq ($(MAKECMDGOALS),)
0336   KBUILD_MODULES := 1
0337 endif
0338 
0339 export KBUILD_MODULES KBUILD_BUILTIN
0340 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
0341 
0342 # We need some generic definitions (do not try to remake the file).
0343 scripts/Kbuild.include: ;
0344 include scripts/Kbuild.include
0345 
0346 # Make variables (CC, etc...)
0347 AS              = $(CROSS_COMPILE)as
0348 LD              = $(CROSS_COMPILE)ld
0349 CC              = $(CROSS_COMPILE)gcc
0350 CPP             = $(CC) -E
0351 AR              = $(CROSS_COMPILE)ar
0352 NM              = $(CROSS_COMPILE)nm
0353 STRIP           = $(CROSS_COMPILE)strip
0354 OBJCOPY         = $(CROSS_COMPILE)objcopy
0355 OBJDUMP         = $(CROSS_COMPILE)objdump
0356 AWK             = awk
0357 GENKSYMS        = scripts/genksyms/genksyms
0358 INSTALLKERNEL  := installkernel
0359 DEPMOD          = /sbin/depmod
0360 PERL            = perl
0361 PYTHON          = python
0362 CHECK           = sparse
0363 
0364 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
0365                   -Wbitwise -Wno-return-void $(CF)
0366 NOSTDINC_FLAGS  =
0367 CFLAGS_MODULE   =
0368 AFLAGS_MODULE   =
0369 LDFLAGS_MODULE  =
0370 CFLAGS_KERNEL   =
0371 AFLAGS_KERNEL   =
0372 LDFLAGS_vmlinux =
0373 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
0374 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
0375 
0376 
0377 # Use USERINCLUDE when you must reference the UAPI directories only.
0378 USERINCLUDE    := \
0379                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
0380                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
0381                 -I$(srctree)/include/uapi \
0382                 -I$(objtree)/include/generated/uapi \
0383                 -include $(srctree)/include/linux/kconfig.h
0384 
0385 # Use LINUXINCLUDE when you must reference the include/ directory.
0386 # Needed to be compatible with the O= option
0387 LINUXINCLUDE    := \
0388                 -I$(srctree)/arch/$(hdr-arch)/include \
0389                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
0390                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
0391                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
0392                 -I$(objtree)/include
0393 
0394 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
0395 
0396 KBUILD_CPPFLAGS := -D__KERNEL__
0397 
0398 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
0399                    -fno-strict-aliasing -fno-common \
0400                    -Werror-implicit-function-declaration \
0401                    -Wno-format-security \
0402                    -std=gnu89 $(call cc-option,-fno-PIE)
0403 
0404 
0405 KBUILD_AFLAGS_KERNEL :=
0406 KBUILD_CFLAGS_KERNEL :=
0407 KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
0408 KBUILD_AFLAGS_MODULE  := -DMODULE
0409 KBUILD_CFLAGS_MODULE  := -DMODULE
0410 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
0411 
0412 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
0413 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
0414 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
0415 
0416 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
0417 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
0418 export CPP AR NM STRIP OBJCOPY OBJDUMP
0419 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
0420 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
0421 
0422 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
0423 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
0424 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
0425 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
0426 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
0427 export KBUILD_ARFLAGS
0428 
0429 # When compiling out-of-tree modules, put MODVERDIR in the module
0430 # tree rather than in the kernel tree. The kernel tree might
0431 # even be read-only.
0432 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
0433 
0434 # Files to ignore in find ... statements
0435 
0436 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
0437                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
0438                           -prune -o
0439 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
0440                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
0441 
0442 # ===========================================================================
0443 # Rules shared between *config targets and build targets
0444 
0445 # Basic helpers built in scripts/
0446 PHONY += scripts_basic
0447 scripts_basic:
0448         $(Q)$(MAKE) $(build)=scripts/basic
0449         $(Q)rm -f .tmp_quiet_recordmcount
0450 
0451 # To avoid any implicit rule to kick in, define an empty command.
0452 scripts/basic/%: scripts_basic ;
0453 
0454 PHONY += outputmakefile
0455 # outputmakefile generates a Makefile in the output directory, if using a
0456 # separate output directory. This allows convenient use of make in the
0457 # output directory.
0458 outputmakefile:
0459 ifneq ($(KBUILD_SRC),)
0460         $(Q)ln -fsn $(srctree) source
0461         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
0462             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
0463 endif
0464 
0465 # Support for using generic headers in asm-generic
0466 PHONY += asm-generic
0467 asm-generic:
0468         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
0469                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
0470         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
0471                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
0472 
0473 # To make sure we do not include .config for any of the *config targets
0474 # catch them early, and hand them over to scripts/kconfig/Makefile
0475 # It is allowed to specify more targets when calling make, including
0476 # mixing *config targets and build targets.
0477 # For example 'make oldconfig all'.
0478 # Detect when mixed targets is specified, and make a second invocation
0479 # of make so .config is not included in this case either (for *config).
0480 
0481 version_h := include/generated/uapi/linux/version.h
0482 old_version_h := include/linux/version.h
0483 
0484 no-dot-config-targets := clean mrproper distclean \
0485                          cscope gtags TAGS tags help% %docs check% coccicheck \
0486                          $(version_h) headers_% archheaders archscripts \
0487                          kernelversion %src-pkg
0488 
0489 config-targets := 0
0490 mixed-targets  := 0
0491 dot-config     := 1
0492 
0493 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
0494         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
0495                 dot-config := 0
0496         endif
0497 endif
0498 
0499 ifeq ($(KBUILD_EXTMOD),)
0500         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
0501                 config-targets := 1
0502                 ifneq ($(words $(MAKECMDGOALS)),1)
0503                         mixed-targets := 1
0504                 endif
0505         endif
0506 endif
0507 # install and module_install need also be processed one by one
0508 ifneq ($(filter install,$(MAKECMDGOALS)),)
0509         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
0510                 mixed-targets := 1
0511         endif
0512 endif
0513 
0514 ifeq ($(mixed-targets),1)
0515 # ===========================================================================
0516 # We're called with mixed targets (*config and build targets).
0517 # Handle them one by one.
0518 
0519 PHONY += $(MAKECMDGOALS) __build_one_by_one
0520 
0521 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
0522         @:
0523 
0524 __build_one_by_one:
0525         $(Q)set -e; \
0526         for i in $(MAKECMDGOALS); do \
0527                 $(MAKE) -f $(srctree)/Makefile $$i; \
0528         done
0529 
0530 else
0531 ifeq ($(config-targets),1)
0532 # ===========================================================================
0533 # *config targets only - make sure prerequisites are updated, and descend
0534 # in scripts/kconfig to make the *config target
0535 
0536 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
0537 # KBUILD_DEFCONFIG may point out an alternative default configuration
0538 # used for 'make defconfig'
0539 include arch/$(SRCARCH)/Makefile
0540 export KBUILD_DEFCONFIG KBUILD_KCONFIG
0541 
0542 config: scripts_basic outputmakefile FORCE
0543         $(Q)$(MAKE) $(build)=scripts/kconfig $@
0544 
0545 %config: scripts_basic outputmakefile FORCE
0546         $(Q)$(MAKE) $(build)=scripts/kconfig $@
0547 
0548 else
0549 # ===========================================================================
0550 # Build targets only - this includes vmlinux, arch specific targets, clean
0551 # targets and others. In general all targets except *config targets.
0552 
0553 ifeq ($(KBUILD_EXTMOD),)
0554 # Additional helpers built in scripts/
0555 # Carefully list dependencies so we do not try to build scripts twice
0556 # in parallel
0557 PHONY += scripts
0558 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
0559          asm-generic gcc-plugins
0560         $(Q)$(MAKE) $(build)=$(@)
0561 
0562 # Objects we will link into vmlinux / subdirs we need to visit
0563 init-y          := init/
0564 drivers-y       := drivers/ sound/ firmware/
0565 net-y           := net/
0566 libs-y          := lib/
0567 core-y          := usr/
0568 virt-y          := virt/
0569 endif # KBUILD_EXTMOD
0570 
0571 ifeq ($(dot-config),1)
0572 # Read in config
0573 -include include/config/auto.conf
0574 
0575 ifeq ($(KBUILD_EXTMOD),)
0576 # Read in dependencies to all Kconfig* files, make sure to run
0577 # oldconfig if changes are detected.
0578 -include include/config/auto.conf.cmd
0579 
0580 # To avoid any implicit rule to kick in, define an empty command
0581 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
0582 
0583 # If .config is newer than include/config/auto.conf, someone tinkered
0584 # with it and forgot to run make oldconfig.
0585 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
0586 # we execute the config step to be sure to catch updated Kconfig files
0587 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
0588         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
0589 else
0590 # external modules needs include/generated/autoconf.h and include/config/auto.conf
0591 # but do not care if they are up-to-date. Use auto.conf to trigger the test
0592 PHONY += include/config/auto.conf
0593 
0594 include/config/auto.conf:
0595         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
0596         echo >&2;                                                       \
0597         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
0598         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
0599         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
0600         echo >&2 ;                                                      \
0601         /bin/false)
0602 
0603 endif # KBUILD_EXTMOD
0604 
0605 else
0606 # Dummy target needed, because used as prerequisite
0607 include/config/auto.conf: ;
0608 endif # $(dot-config)
0609 
0610 # For the kernel to actually contain only the needed exported symbols,
0611 # we have to build modules as well to determine what those symbols are.
0612 # (this can be evaluated only once include/config/auto.conf has been included)
0613 ifdef CONFIG_TRIM_UNUSED_KSYMS
0614   KBUILD_MODULES := 1
0615 endif
0616 
0617 # The all: target is the default when no target is given on the
0618 # command line.
0619 # This allow a user to issue only 'make' to build a kernel including modules
0620 # Defaults to vmlinux, but the arch makefile usually adds further targets
0621 all: vmlinux
0622 
0623 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
0624 # values of the respective KBUILD_* variables
0625 ARCH_CPPFLAGS :=
0626 ARCH_AFLAGS :=
0627 ARCH_CFLAGS :=
0628 include arch/$(SRCARCH)/Makefile
0629 
0630 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
0631 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
0632 
0633 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
0634 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
0635 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
0636 endif
0637 
0638 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
0639 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
0640 else
0641 ifdef CONFIG_PROFILE_ALL_BRANCHES
0642 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
0643 else
0644 KBUILD_CFLAGS   += -O2
0645 endif
0646 endif
0647 
0648 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
0649                         $(call cc-disable-warning,maybe-uninitialized,))
0650 
0651 # Tell gcc to never replace conditional load with a non-conditional one
0652 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
0653 
0654 include scripts/Makefile.gcc-plugins
0655 
0656 ifdef CONFIG_READABLE_ASM
0657 # Disable optimizations that make assembler listings hard to read.
0658 # reorder blocks reorders the control in the function
0659 # ipa clone creates specialized cloned functions
0660 # partial inlining inlines only parts of functions
0661 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
0662                  $(call cc-option,-fno-ipa-cp-clone,) \
0663                  $(call cc-option,-fno-partial-inlining)
0664 endif
0665 
0666 ifneq ($(CONFIG_FRAME_WARN),0)
0667 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
0668 endif
0669 
0670 # This selects the stack protector compiler flag. Testing it is delayed
0671 # until after .config has been reprocessed, in the prepare-compiler-check
0672 # target.
0673 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
0674   stackp-flag := -fstack-protector
0675   stackp-name := REGULAR
0676 else
0677 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
0678   stackp-flag := -fstack-protector-strong
0679   stackp-name := STRONG
0680 else
0681   # Force off for distro compilers that enable stack protector by default.
0682   stackp-flag := $(call cc-option, -fno-stack-protector)
0683 endif
0684 endif
0685 # Find arch-specific stack protector compiler sanity-checking script.
0686 ifdef CONFIG_CC_STACKPROTECTOR
0687   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
0688   stackp-check := $(wildcard $(stackp-path))
0689 endif
0690 KBUILD_CFLAGS += $(stackp-flag)
0691 
0692 ifeq ($(cc-name),clang)
0693 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
0694 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
0695 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
0696 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
0697 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
0698 # Quiet clang warning: comparison of unsigned expression < 0 is always false
0699 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
0700 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
0701 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
0702 # See modpost pattern 2
0703 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
0704 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
0705 else
0706 
0707 # These warnings generated too much noise in a regular build.
0708 # Use make W=1 to enable them (see scripts/Makefile.build)
0709 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
0710 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
0711 endif
0712 
0713 ifdef CONFIG_FRAME_POINTER
0714 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
0715 else
0716 # Some targets (ARM with Thumb2, for example), can't be built with frame
0717 # pointers.  For those, we don't have FUNCTION_TRACER automatically
0718 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
0719 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
0720 # -fomit-frame-pointer with FUNCTION_TRACER.
0721 ifndef CONFIG_FUNCTION_TRACER
0722 KBUILD_CFLAGS   += -fomit-frame-pointer
0723 endif
0724 endif
0725 
0726 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
0727 
0728 ifdef CONFIG_DEBUG_INFO
0729 ifdef CONFIG_DEBUG_INFO_SPLIT
0730 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
0731 else
0732 KBUILD_CFLAGS   += -g
0733 endif
0734 KBUILD_AFLAGS   += -Wa,-gdwarf-2
0735 endif
0736 ifdef CONFIG_DEBUG_INFO_DWARF4
0737 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
0738 endif
0739 
0740 ifdef CONFIG_DEBUG_INFO_REDUCED
0741 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
0742                    $(call cc-option,-fno-var-tracking)
0743 endif
0744 
0745 ifdef CONFIG_FUNCTION_TRACER
0746 ifndef CC_FLAGS_FTRACE
0747 CC_FLAGS_FTRACE := -pg
0748 endif
0749 export CC_FLAGS_FTRACE
0750 ifdef CONFIG_HAVE_FENTRY
0751 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
0752 endif
0753 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
0754 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
0755 ifdef CONFIG_DYNAMIC_FTRACE
0756         ifdef CONFIG_HAVE_C_RECORDMCOUNT
0757                 BUILD_C_RECORDMCOUNT := y
0758                 export BUILD_C_RECORDMCOUNT
0759         endif
0760 endif
0761 endif
0762 
0763 # We trigger additional mismatches with less inlining
0764 ifdef CONFIG_DEBUG_SECTION_MISMATCH
0765 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
0766 endif
0767 
0768 # arch Makefile may override CC so keep this after arch Makefile is included
0769 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
0770 CHECKFLAGS     += $(NOSTDINC_FLAGS)
0771 
0772 # warn about C99 declaration after statement
0773 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
0774 
0775 # disable pointer signed / unsigned warnings in gcc 4.0
0776 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
0777 
0778 # disable invalid "can't wrap" optimizations for signed / pointers
0779 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
0780 
0781 # conserve stack if available
0782 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
0783 
0784 # disallow errors like 'EXPORT_GPL(foo);' with missing header
0785 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
0786 
0787 # require functions to have arguments in prototypes, not empty 'int foo()'
0788 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
0789 
0790 # Prohibit date/time macros, which would make the build non-deterministic
0791 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
0792 
0793 # enforce correct pointer usage
0794 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
0795 
0796 # use the deterministic mode of AR if available
0797 KBUILD_ARFLAGS := $(call ar-option,D)
0798 
0799 # check for 'asm goto'
0800 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
0801         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
0802         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
0803 endif
0804 
0805 include scripts/Makefile.kasan
0806 include scripts/Makefile.extrawarn
0807 include scripts/Makefile.ubsan
0808 
0809 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
0810 # last assignments
0811 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
0812 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
0813 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
0814 
0815 # Use --build-id when available.
0816 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
0817                               $(call cc-ldoption, -Wl$(comma)--build-id,))
0818 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
0819 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
0820 
0821 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
0822 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
0823 endif
0824 
0825 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
0826 LDFLAGS_vmlinux += $(call ld-option, -X,)
0827 endif
0828 
0829 # Default kernel image to build when no specific target is given.
0830 # KBUILD_IMAGE may be overruled on the command line or
0831 # set in the environment
0832 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
0833 # this default value
0834 export KBUILD_IMAGE ?= vmlinux
0835 
0836 #
0837 # INSTALL_PATH specifies where to place the updated kernel and system map
0838 # images. Default is /boot, but you can set it to other values
0839 export  INSTALL_PATH ?= /boot
0840 
0841 #
0842 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
0843 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
0844 # an argument if needed. Otherwise it defaults to the kernel install path
0845 #
0846 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
0847 
0848 #
0849 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
0850 # relocations required by build roots.  This is not defined in the
0851 # makefile but the argument can be passed to make if needed.
0852 #
0853 
0854 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
0855 export MODLIB
0856 
0857 #
0858 # INSTALL_MOD_STRIP, if defined, will cause modules to be
0859 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
0860 # the default option --strip-debug will be used.  Otherwise,
0861 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
0862 
0863 ifdef INSTALL_MOD_STRIP
0864 ifeq ($(INSTALL_MOD_STRIP),1)
0865 mod_strip_cmd = $(STRIP) --strip-debug
0866 else
0867 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
0868 endif # INSTALL_MOD_STRIP=1
0869 else
0870 mod_strip_cmd = true
0871 endif # INSTALL_MOD_STRIP
0872 export mod_strip_cmd
0873 
0874 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
0875 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
0876 # or CONFIG_MODULE_COMPRESS_XZ.
0877 
0878 mod_compress_cmd = true
0879 ifdef CONFIG_MODULE_COMPRESS
0880   ifdef CONFIG_MODULE_COMPRESS_GZIP
0881     mod_compress_cmd = gzip -n -f
0882   endif # CONFIG_MODULE_COMPRESS_GZIP
0883   ifdef CONFIG_MODULE_COMPRESS_XZ
0884     mod_compress_cmd = xz -f
0885   endif # CONFIG_MODULE_COMPRESS_XZ
0886 endif # CONFIG_MODULE_COMPRESS
0887 export mod_compress_cmd
0888 
0889 # Select initial ramdisk compression format, default is gzip(1).
0890 # This shall be used by the dracut(8) tool while creating an initramfs image.
0891 #
0892 INITRD_COMPRESS-y                  := gzip
0893 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
0894 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
0895 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
0896 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
0897 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
0898 # do not export INITRD_COMPRESS, since we didn't actually
0899 # choose a sane default compression above.
0900 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
0901 
0902 ifdef CONFIG_MODULE_SIG_ALL
0903 $(eval $(call config_filename,MODULE_SIG_KEY))
0904 
0905 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
0906 else
0907 mod_sign_cmd = true
0908 endif
0909 export mod_sign_cmd
0910 
0911 
0912 ifeq ($(KBUILD_EXTMOD),)
0913 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
0914 
0915 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
0916                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
0917                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
0918 
0919 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
0920                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
0921 
0922 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
0923 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
0924 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
0925 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
0926 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
0927 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
0928 libs-y          := $(libs-y1) $(libs-y2)
0929 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
0930 
0931 # Externally visible symbols (used by link-vmlinux.sh)
0932 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
0933 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
0934 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
0935 export LDFLAGS_vmlinux
0936 # used by scripts/pacmage/Makefile
0937 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 
0938 
0939 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
0940 
0941 # Include targets which we want to execute sequentially if the rest of the
0942 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
0943 # evaluated more than once.
0944 PHONY += vmlinux_prereq
0945 vmlinux_prereq: $(vmlinux-deps) FORCE
0946 ifdef CONFIG_HEADERS_CHECK
0947         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
0948 endif
0949 ifdef CONFIG_GDB_SCRIPTS
0950         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
0951 endif
0952 ifdef CONFIG_TRIM_UNUSED_KSYMS
0953         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
0954           "$(MAKE) -f $(srctree)/Makefile vmlinux"
0955 endif
0956 
0957 # standalone target for easier testing
0958 include/generated/autoksyms.h: FORCE
0959         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
0960 
0961 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
0962 
0963 # Final link of vmlinux with optional arch pass after final link
0964     cmd_link-vmlinux =                                                 \
0965         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
0966         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
0967 
0968 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
0969         +$(call if_changed,link-vmlinux)
0970 
0971 # Build samples along the rest of the kernel
0972 ifdef CONFIG_SAMPLES
0973 vmlinux-dirs += samples
0974 endif
0975 
0976 # The actual objects are generated when descending,
0977 # make sure no implicit rule kicks in
0978 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
0979 
0980 # Handle descending into subdirectories listed in $(vmlinux-dirs)
0981 # Preset locale variables to speed up the build process. Limit locale
0982 # tweaks to this spot to avoid wrong language settings when running
0983 # make menuconfig etc.
0984 # Error messages still appears in the original language
0985 
0986 PHONY += $(vmlinux-dirs)
0987 $(vmlinux-dirs): prepare scripts
0988         $(Q)$(MAKE) $(build)=$@
0989 
0990 define filechk_kernel.release
0991         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
0992 endef
0993 
0994 # Store (new) KERNELRELEASE string in include/config/kernel.release
0995 include/config/kernel.release: include/config/auto.conf FORCE
0996         $(call filechk,kernel.release)
0997 
0998 
0999 # 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
1006 PHONY += 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 $(srctree)
1011 prepare3: include/config/kernel.release
1012 ifneq ($(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;
1019 endif
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.
1024 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1025 
1026 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1027                    include/config/auto.conf
1028         $(cmd_crmodverdir)
1029 
1030 archprepare: archheaders archscripts prepare1 scripts_basic
1031 
1032 prepare0: archprepare gcc-plugins
1033         $(Q)$(MAKE) $(build)=.
1034 
1035 # All the preparing..
1036 prepare: prepare0 prepare-objtool
1037 
1038 ifdef 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
1048 endif
1049 
1050 PHONY += prepare-objtool
1051 prepare-objtool: $(objtool_target)
1052 
1053 # Check for CONFIG flags that require compiler support. Abort the build
1054 # after .config has been processed, but before the kernel build starts.
1055 #
1056 # For security-sensitive CONFIG options, we don't want to fallback and/or
1057 # silently change which compiler flags will be used, since that leads to
1058 # producing kernels with different security feature characteristics
1059 # depending on the compiler used. (For example, "But I selected
1060 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1061 PHONY += prepare-compiler-check
1062 prepare-compiler-check: FORCE
1063 # Make sure compiler supports requested stack protector flag.
1064 ifdef stackp-name
1065   ifeq ($(call cc-option, $(stackp-flag)),)
1066         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1067                   $(stackp-flag) not supported by compiler >&2 && exit 1
1068   endif
1069 endif
1070 # Make sure compiler does not have buggy stack-protector support.
1071 ifdef stackp-check
1072   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1073         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1074                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1075   endif
1076 endif
1077         @:
1078 
1079 # Generate some files
1080 # ---------------------------------------------------------------------------
1081 
1082 # KERNELRELEASE can change from a few different places, meaning version.h
1083 # needs to be updated, so this check is forced on all builds
1084 
1085 uts_len := 64
1086 define filechk_utsrelease.h
1087         if [ `echo -n "$(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)\";)
1092 endef
1093 
1094 define 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))';)
1098 endef
1099 
1100 $(version_h): $(srctree)/Makefile FORCE
1101         $(call filechk,version.h)
1102         $(Q)rm -f $(old_version_h)
1103 
1104 include/generated/utsrelease.h: include/config/kernel.release FORCE
1105         $(call filechk,utsrelease.h)
1106 
1107 PHONY += headerdep
1108 headerdep:
1109         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1110         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1111 
1112 # ---------------------------------------------------------------------------
1113 # Firmware install
1114 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1115 export INSTALL_FW_PATH
1116 
1117 PHONY += firmware_install
1118 firmware_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
1126 export INSTALL_HDR_PATH = $(objtree)/usr
1127 
1128 # If we do an all arch process set dst to asm-$(hdr-arch)
1129 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1130 
1131 PHONY += archheaders
1132 archheaders:
1133 
1134 PHONY += archscripts
1135 archscripts:
1136 
1137 PHONY += __headers
1138 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1139         $(Q)$(MAKE) $(build)=scripts build_unifdef
1140 
1141 PHONY += headers_install_all
1142 headers_install_all:
1143         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1144 
1145 PHONY += headers_install
1146 headers_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 
1152 PHONY += headers_check_all
1153 headers_check_all: headers_install_all
1154         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1155 
1156 PHONY += headers_check
1157 headers_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 
1164 PHONY += kselftest
1165 kselftest:
1166         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1167 
1168 kselftest-clean:
1169         $(Q)$(MAKE) -C tools/testing/selftests clean
1170 
1171 PHONY += kselftest-merge
1172 kselftest-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 
1182 ifdef CONFIG_MODULES
1183 
1184 # By default, build modules as well
1185 
1186 all: 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 
1194 PHONY += modules
1195 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1196         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1197         @$(kecho) '  Building modules, stage 2.';
1198         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1199         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1200 
1201 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1202         $(Q)$(AWK) '!x[$$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
1209 PHONY += modules_prepare
1210 modules_prepare: prepare scripts
1211 
1212 # Target to install modules
1213 PHONY += modules_install
1214 modules_install: _modinst_ _modinst_post
1215 
1216 PHONY += _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.
1233 PHONY += _modinst_post
1234 _modinst_post: _modinst_
1235         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1236         $(call cmd,depmod)
1237 
1238 ifeq ($(CONFIG_MODULE_SIG), y)
1239 PHONY += modules_sign
1240 modules_sign:
1241         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1242 endif
1243 
1244 else # CONFIG_MODULES
1245 
1246 # Modules not configured
1247 # ---------------------------------------------------------------------------
1248 
1249 PHONY += modules modules_install
1250 modules 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 
1258 endif # 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'
1268 CLEAN_DIRS  += $(MODVERDIR)
1269 
1270 # Directories & files removed with 'make mrproper'
1271 MRPROPER_DIRS  += include/config usr/include include/generated          \          
1272                   arch/*/include/generated .tmp_objdiff
1273 MRPROPER_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 #
1281 clean: rm-dirs  := $(CLEAN_DIRS)
1282 clean: rm-files := $(CLEAN_FILES)
1283 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1284 
1285 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1286 $(clean-dirs):
1287         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1288 
1289 vmlinuxclean:
1290         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1291         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1292 
1293 clean: archclean vmlinuxclean
1294 
1295 # mrproper - Delete all generated files, including .config
1296 #
1297 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1298 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1299 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1300 
1301 PHONY += $(mrproper-dirs) mrproper archmrproper
1302 $(mrproper-dirs):
1303         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1304 
1305 mrproper: clean archmrproper $(mrproper-dirs)
1306         $(call cmd,rmdirs)
1307         $(call cmd,rmfiles)
1308 
1309 # distclean
1310 #
1311 PHONY += distclean
1312 
1313 distclean: 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
1324 package-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) $@
1330 rpm: include/config/kernel.release FORCE
1331         $(Q)$(MAKE) $(build)=$(package-dir) $@
1332 
1333 
1334 # Brief documentation of the typical targets used
1335 # ---------------------------------------------------------------------------
1336 
1337 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1338 boards := $(sort $(notdir $(boards)))
1339 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1340 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1341 
1342 PHONY += help
1343 help:
1344         @echo  'Cleaning targets:'
1345         @echo  '  clean           - Remove most generated files but keep the config and'
1346         @echo  '                    enough build support to build external modules'
1347         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1348         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1349         @echo  ''
1350         @echo  'Configuration targets:'
1351         @$(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 
1431 help-board-dirs := $(addprefix help-,$(board-dirs))
1432 
1433 help-boards: $(help-board-dirs)
1434 
1435 boards-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 # ---------------------------------------------------------------------------
1447 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1448 PHONY += $(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 
1454 else # 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
1474 KBUILD_MODULES := 1
1475 PHONY += crmodverdir
1476 crmodverdir:
1477         $(cmd_crmodverdir)
1478 
1479 PHONY += $(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 
1487 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1488 PHONY += $(module-dirs) modules
1489 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1490         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1491 
1492 modules: $(module-dirs)
1493         @$(kecho) '  Building modules, stage 2.';
1494         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1495 
1496 PHONY += modules_install
1497 modules_install: _emodinst_ _emodinst_post
1498 
1499 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1500 PHONY += _emodinst_
1501 _emodinst_:
1502         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1503         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1504 
1505 PHONY += _emodinst_post
1506 _emodinst_post: _emodinst_
1507         $(call cmd,depmod)
1508 
1509 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1510 
1511 PHONY += $(clean-dirs) clean
1512 $(clean-dirs):
1513         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1514 
1515 clean:  rm-dirs := $(MODVERDIR)
1516 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1517 
1518 PHONY += help
1519 help:
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...
1529 PHONY += prepare scripts
1530 prepare: ;
1531 scripts: ;
1532 endif # KBUILD_EXTMOD
1533 
1534 clean: $(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 # ---------------------------------------------------------------------------
1550 quiet_cmd_tags = GEN     $@
1551       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1552 
1553 tags TAGS cscope gtags: FORCE
1554         $(call cmd,tags)
1555 
1556 # Scripts to check various things for consistency
1557 # ---------------------------------------------------------------------------
1558 
1559 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1560 
1561 includecheck:
1562         find $(srctree)/* $(RCS_FIND_IGNORE) \
1563                 -name '*.[hcS]' -type f -print | sort \
1564                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1565 
1566 versioncheck:
1567         find $(srctree)/* $(RCS_FIND_IGNORE) \
1568                 -name '*.[hcS]' -type f -print | sort \
1569                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1570 
1571 coccicheck:
1572         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1573 
1574 namespacecheck:
1575         $(PERL) $(srctree)/scripts/namespace.pl
1576 
1577 export_report:
1578         $(PERL) $(srctree)/scripts/export_report.pl
1579 
1580 endif #ifeq ($(config-targets),1)
1581 endif #ifeq ($(mixed-targets),1)
1582 
1583 PHONY += 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 $(SUBARCH) doesn't work here.
1589 ifeq ($(ARCH), um)
1590 CHECKSTACK_ARCH := $(SUBARCH)
1591 else
1592 CHECKSTACK_ARCH := $(ARCH)
1593 endif
1594 checkstack:
1595         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1596         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1597 
1598 kernelrelease:
1599         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1600 
1601 kernelversion:
1602         @echo $(KERNELVERSION)
1603 
1604 image_name:
1605         @echo $(KBUILD_IMAGE)
1606 
1607 # Clear a bunch of variables before executing the submake
1608 tools/: 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 
1612 tools/%: 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/ $*
1615 
1616 # Single targets
1617 # ---------------------------------------------------------------------------
1618 # Single targets are compatible with:
1619 # - build with mixed source and output
1620 # - build with separate output dir 'make O=...'
1621 # - external modules
1622 #
1623 #  target-dir => where to store outputfile
1624 #  build-dir  => directory in kernel source tree to use
1625 
1626 ifeq ($(KBUILD_EXTMOD),)
1627         build-dir  = $(patsubst %/,%,$(dir $@))
1628         target-dir = $(dir $@)
1629 else
1630         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1631         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1632         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1633 endif
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
1656 Documentation/ 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 
1670 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1671       cmd_rmdirs = rm -rf $(rm-dirs)
1672 
1673 quiet_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
1677 quiet_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
1683 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1684                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1685 
1686 # read all saved command lines
1687 
1688 targets := $(wildcard $(sort $(targets)))
1689 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1690 
1691 ifneq ($(cmd_files),)
1692   $(cmd_files): ;       # Do not try to update included dependency files
1693   include $(cmd_files)
1694 endif
1695 
1696 endif   # skip-makefile
1697 
1698 PHONY += FORCE
1699 FORCE:
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)