Skip to content
Snippets Groups Projects
Select Git revision
  • ba47d845d715a010f7b51f6f89bae32845e6acb7
  • add-vdpu381-and-383-to-rkvdec
  • prepare-add-vdpu381-and-383-to-rkvdec
  • add-rkvdec2-driver-vdpu383-hevc
  • add-rkvdec2-driver-vdpu383
  • add-rkvdec2-driver-hevc
  • rkvdec-mov-to-structs
  • av1-fix-postproc-leak
  • add-rkvdec2-driver-iommu-422-10bits
  • patch-queue/jamba/trixie
  • hdmi-fix-1080p-rock4d-6.11
  • upstreaming/rk3576-rock4d-spi-v1
  • upstreaming/rk3576-rock4d-support-v5
  • upstreaming/rk3588-hdmi-audio-6
  • upstreaming/rk3576-rock4d-support-v3
  • upstreaming/rk3576-rock4d-support-v1
  • upstreaming/rk3576-rock4d-support
  • add-rkvdec2-driver-iommu
  • upstream/rk3576-rock-4d
  • rk3588-hdmi-audio-2
  • fix-rk3588-i2s-tdm-clocks
  • v6.3
  • v6.3-rc1
  • v6.2-rc1
  • v6.0-rc1
  • v5.19-rc3
  • v5.19-rc2
  • v5.19-rc1
  • v5.18
  • v5.18-rc7
  • v5.18-rc6
  • v5.18-rc5
  • v5.18-rc4
  • v5.18-rc3
  • v5.18-rc2
  • v5.18-rc1
  • v5.17
  • v5.17-rc8
  • v5.17-rc7
  • v5.17-rc6
  • v5.17-rc5
41 results

Makefile

Blame
  • Forked from hardware-enablement / Rockchip upstream enablement efforts / linux
    Source project has a limited visibility.
    Makefile 60.42 KiB
    # SPDX-License-Identifier: GPL-2.0
    VERSION = 5
    PATCHLEVEL = 8
    SUBLEVEL = 0
    EXTRAVERSION = -rc6
    NAME = Kleptomaniac Octopus
    
    # *DOCUMENTATION*
    # To see a list of typical targets execute "make help"
    # More info can be located in ./README
    # Comments in this file are targeted only to the developer, do not
    # expect to learn how to build the kernel reading this file.
    
    $(if $(filter __%, $(MAKECMDGOALS)), \
    	$(error targets prefixed with '__' are only for internal use))
    
    # That's our default target when none is given on the command line
    PHONY := __all
    __all:
    
    # We are using a recursive build, so we need to do a little thinking
    # to get the ordering right.
    #
    # Most importantly: sub-Makefiles should only ever modify files in
    # their own directory. If in some directory we have a dependency on
    # a file in another dir (which doesn't happen often, but it's often
    # unavoidable when linking the built-in.a targets which finally
    # turn into vmlinux), we will call a sub make in that other dir, and
    # after that we are sure that everything which is in that other dir
    # is now up to date.
    #
    # The only cases where we need to modify files which have global
    # effects are thus separated out and done before the recursive
    # descending is started. They are now explicitly listed as the
    # prepare rule.
    
    ifneq ($(sub_make_done),1)
    
    # Do not use make's built-in rules and variables
    # (this increases performance and avoids hard-to-debug behaviour)
    MAKEFLAGS += -rR
    
    # Avoid funny character set dependencies
    unexport LC_ALL
    LC_COLLATE=C
    LC_NUMERIC=C
    export LC_COLLATE LC_NUMERIC
    
    # Avoid interference with shell env settings
    unexport GREP_OPTIONS
    
    # Beautify output
    # ---------------------------------------------------------------------------
    #
    # Normally, we echo the whole command before executing it. By making
    # that echo $($(quiet)$(cmd)), we now have the possibility to set
    # $(quiet) to choose other forms of output instead, e.g.
    #
    #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
    #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
    #
    # If $(quiet) is empty, the whole command will be printed.
    # If it is set to "quiet_", only the short version will be printed.
    # If it is set to "silent_", nothing will be printed at all, since
    # the variable $(silent_cmd_cc_o_c) doesn't exist.
    #
    # A simple variant is to prefix commands with $(Q) - that's useful
    # for commands that shall be hidden in non-verbose mode.
    #
    #	$(Q)ln $@ :<
    #
    # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
    # If KBUILD_VERBOSE equals 1 then the above command is displayed.
    # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
    #
    # To put more focus on warnings, be less verbose as default
    # Use 'make V=1' to see the full commands
    
    ifeq ("$(origin V)", "command line")
      KBUILD_VERBOSE = $(V)
    endif
    ifndef KBUILD_VERBOSE
      KBUILD_VERBOSE = 0
    endif
    
    ifeq ($(KBUILD_VERBOSE),1)
      quiet =
      Q =
    else
      quiet=quiet_
      Q = @
    endif
    
    # If the user is running make -s (silent mode), suppress echoing of
    # commands
    
    ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
      quiet=silent_
    endif
    
    export quiet Q KBUILD_VERBOSE
    
    # Kbuild will save output files in the current working directory.
    # This does not need to match to the root of the kernel source tree.
    #
    # For example, you can do this:
    #
    #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
    #
    # If you want to save output files in a different location, there are
    # two syntaxes to specify it.
    #
    # 1) O=
    # Use "make O=dir/to/store/output/files/"
    #
    # 2) Set KBUILD_OUTPUT
    # Set the environment variable KBUILD_OUTPUT to point to the output directory.
    # export KBUILD_OUTPUT=dir/to/store/output/files/; make
    #
    # The O= assignment takes precedence over the KBUILD_OUTPUT environment
    # variable.
    
    # Do we want to change the working directory?
    ifeq ("$(origin O)", "command line")
      KBUILD_OUTPUT := $(O)
    endif
    
    ifneq ($(KBUILD_OUTPUT),)
    # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
    # expand a shell special character '~'. We use a somewhat tedious way here.
    abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
    $(if $(abs_objtree),, \
         $(error failed to create output directory "$(KBUILD_OUTPUT)"))
    
    # $(realpath ...) resolves symlinks
    abs_objtree := $(realpath $(abs_objtree))
    else
    abs_objtree := $(CURDIR)
    endif # ifneq ($(KBUILD_OUTPUT),)
    
    ifeq ($(abs_objtree),$(CURDIR))
    # Suppress "Entering directory ..." unless we are changing the work directory.
    MAKEFLAGS += --no-print-directory
    else
    need-sub-make := 1
    endif
    
    abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
    
    ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
    $(error source directory cannot contain spaces or colons)
    endif
    
    ifneq ($(abs_srctree),$(abs_objtree))
    # Look for make include files relative to root of kernel src
    #
    # This does not become effective immediately because MAKEFLAGS is re-parsed
    # once after the Makefile is read. We need to invoke sub-make.
    MAKEFLAGS += --include-dir=$(abs_srctree)
    need-sub-make := 1
    endif
    
    this-makefile := $(lastword $(MAKEFILE_LIST))
    
    ifneq ($(filter 3.%,$(MAKE_VERSION)),)
    # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
    # We need to invoke sub-make to avoid implicit rules in the top Makefile.
    need-sub-make := 1
    # Cancel implicit rules for this Makefile.
    $(this-makefile): ;
    endif
    
    export abs_srctree abs_objtree
    export sub_make_done := 1
    
    ifeq ($(need-sub-make),1)
    
    PHONY += $(MAKECMDGOALS) __sub-make
    
    $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
    	@:
    
    # Invoke a second make in the output directory, passing relevant variables
    __sub-make:
    	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
    
    endif # need-sub-make
    endif # sub_make_done
    
    # We process the rest of the Makefile if this is the final invocation of make
    ifeq ($(need-sub-make),)
    
    # Do not print "Entering directory ...",
    # but we want to display it when entering to the output directory
    # so that IDEs/editors are able to understand relative filenames.
    MAKEFLAGS += --no-print-directory
    
    # Call a source code checker (by default, "sparse") as part of the
    # C compilation.
    #
    # Use 'make C=1' to enable checking of only re-compiled files.
    # Use 'make C=2' to enable checking of *all* source files, regardless
    # of whether they are re-compiled or not.
    #
    # See the file "Documentation/dev-tools/sparse.rst" for more details,
    # including where to get the "sparse" utility.
    
    ifeq ("$(origin C)", "command line")
      KBUILD_CHECKSRC = $(C)
    endif
    ifndef KBUILD_CHECKSRC
      KBUILD_CHECKSRC = 0
    endif
    
    # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
    # directory of external module to build. Setting M= takes precedence.
    ifeq ("$(origin M)", "command line")
      KBUILD_EXTMOD := $(M)
    endif
    
    $(if $(word 2, $(KBUILD_EXTMOD)), \
    	$(error building multiple external modules is not supported))
    
    export KBUILD_CHECKSRC KBUILD_EXTMOD
    
    extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
    
    ifeq ($(abs_srctree),$(abs_objtree))
            # building in the source tree
            srctree := .
    	building_out_of_srctree :=
    else
            ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
                    # building in a subdirectory of the source tree
                    srctree := ..
            else
                    srctree := $(abs_srctree)
            endif
    	building_out_of_srctree := 1
    endif
    
    ifneq ($(KBUILD_ABS_SRCTREE),)
    srctree := $(abs_srctree)
    endif
    
    objtree		:= .
    VPATH		:= $(srctree)
    
    export building_out_of_srctree srctree objtree VPATH
    
    # To make sure we do not include .config for any of the *config targets
    # catch them early, and hand them over to scripts/kconfig/Makefile
    # It is allowed to specify more targets when calling make, including
    # mixing *config targets and build targets.
    # For example 'make oldconfig all'.
    # Detect when mixed targets is specified, and make a second invocation
    # of make so .config is not included in this case either (for *config).
    
    version_h := include/generated/uapi/linux/version.h
    old_version_h := include/linux/version.h
    
    clean-targets := %clean mrproper cleandocs
    no-dot-config-targets := $(clean-targets) \
    			 cscope gtags TAGS tags help% %docs check% coccicheck \
    			 $(version_h) headers headers_% archheaders archscripts \
    			 %asm-generic kernelversion %src-pkg dt_binding_check \
    			 outputmakefile
    no-sync-config-targets := $(no-dot-config-targets) install %install \
    			   kernelrelease
    single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
    
    config-build	:=
    mixed-build	:=
    need-config	:= 1
    may-sync-config	:= 1
    single-build	:=
    
    ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
    	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
    		need-config :=
    	endif
    endif
    
    ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
    	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
    		may-sync-config :=
    	endif
    endif
    
    ifneq ($(KBUILD_EXTMOD),)
    	may-sync-config :=
    endif
    
    ifeq ($(KBUILD_EXTMOD),)
            ifneq ($(filter config %config,$(MAKECMDGOALS)),)
    		config-build := 1
                    ifneq ($(words $(MAKECMDGOALS)),1)
    			mixed-build := 1
                    endif
            endif
    endif
    
    # We cannot build single targets and the others at the same time
    ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
    	single-build := 1
    	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
    		mixed-build := 1
    	endif
    endif
    
    # For "make -j clean all", "make -j mrproper defconfig all", etc.
    ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
            ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
    		mixed-build := 1
            endif
    endif
    
    # install and modules_install need also be processed one by one
    ifneq ($(filter install,$(MAKECMDGOALS)),)
            ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
    		mixed-build := 1
            endif
    endif
    
    ifdef mixed-build
    # ===========================================================================
    # We're called with mixed targets (*config and build targets).
    # Handle them one by one.
    
    PHONY += $(MAKECMDGOALS) __build_one_by_one
    
    $(MAKECMDGOALS): __build_one_by_one
    	@:
    
    __build_one_by_one:
    	$(Q)set -e; \
    	for i in $(MAKECMDGOALS); do \
    		$(MAKE) -f $(srctree)/Makefile $$i; \
    	done
    
    else # !mixed-build
    
    include scripts/Kbuild.include
    
    # Read KERNELRELEASE from include/config/kernel.release (if it exists)
    KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
    KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
    export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
    
    include scripts/subarch.include
    
    # Cross compiling and selecting different set of gcc/bin-utils
    # ---------------------------------------------------------------------------
    #
    # When performing cross compilation for other architectures ARCH shall be set
    # to the target architecture. (See arch/* for the possibilities).
    # ARCH can be set during invocation of make:
    # make ARCH=ia64
    # Another way is to have ARCH set in the environment.
    # The default ARCH is the host where make is executed.
    
    # CROSS_COMPILE specify the prefix used for all executables used
    # during compilation. Only gcc and related bin-utils executables
    # are prefixed with $(CROSS_COMPILE).
    # CROSS_COMPILE can be set on the command line
    # make CROSS_COMPILE=ia64-linux-
    # Alternatively CROSS_COMPILE can be set in the environment.
    # Default value for CROSS_COMPILE is not to prefix executables
    # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
    ARCH		?= $(SUBARCH)
    
    # Architecture as present in compile.h
    UTS_MACHINE 	:= $(ARCH)
    SRCARCH 	:= $(ARCH)
    
    # Additional ARCH settings for x86
    ifeq ($(ARCH),i386)
            SRCARCH := x86
    endif
    ifeq ($(ARCH),x86_64)
            SRCARCH := x86
    endif
    
    # Additional ARCH settings for sparc
    ifeq ($(ARCH),sparc32)
           SRCARCH := sparc
    endif
    ifeq ($(ARCH),sparc64)
           SRCARCH := sparc
    endif
    
    # Additional ARCH settings for sh
    ifeq ($(ARCH),sh64)
           SRCARCH := sh
    endif
    
    KCONFIG_CONFIG	?= .config
    export KCONFIG_CONFIG
    
    # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
    export KBUILD_DEFCONFIG := defconfig
    
    # SHELL used by kbuild
    CONFIG_SHELL := sh
    
    HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
    HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
    HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
    
    ifneq ($(LLVM),)
    HOSTCC	= clang
    HOSTCXX	= clang++
    else
    HOSTCC	= gcc
    HOSTCXX	= g++
    endif
    
    export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
    			      -O2 -fomit-frame-pointer -std=gnu89
    export KBUILD_USERLDFLAGS :=
    
    KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
    KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
    KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
    KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
    
    # Make variables (CC, etc...)
    CPP		= $(CC) -E
    ifneq ($(LLVM),)
    CC		= clang
    LD		= ld.lld
    AR		= llvm-ar
    NM		= llvm-nm
    OBJCOPY		= llvm-objcopy
    OBJDUMP		= llvm-objdump
    READELF		= llvm-readelf
    OBJSIZE		= llvm-size
    STRIP		= llvm-strip
    else
    CC		= $(CROSS_COMPILE)gcc
    LD		= $(CROSS_COMPILE)ld
    AR		= $(CROSS_COMPILE)ar
    NM		= $(CROSS_COMPILE)nm
    OBJCOPY		= $(CROSS_COMPILE)objcopy
    OBJDUMP		= $(CROSS_COMPILE)objdump
    READELF		= $(CROSS_COMPILE)readelf
    OBJSIZE		= $(CROSS_COMPILE)size
    STRIP		= $(CROSS_COMPILE)strip
    endif
    PAHOLE		= pahole
    LEX		= flex
    YACC		= bison
    AWK		= awk
    INSTALLKERNEL  := installkernel
    DEPMOD		= /sbin/depmod
    PERL		= perl
    PYTHON		= python
    PYTHON3		= python3
    CHECK		= sparse
    BASH		= bash
    KGZIP		= gzip
    KBZIP2		= bzip2
    KLZOP		= lzop
    LZMA		= lzma
    LZ4		= lz4c
    XZ		= xz
    
    CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
    		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
    NOSTDINC_FLAGS :=
    CFLAGS_MODULE   =
    AFLAGS_MODULE   =
    LDFLAGS_MODULE  =
    CFLAGS_KERNEL	=
    AFLAGS_KERNEL	=
    LDFLAGS_vmlinux =
    
    # Use USERINCLUDE when you must reference the UAPI directories only.
    USERINCLUDE    := \
    		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
    		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
    		-I$(srctree)/include/uapi \
    		-I$(objtree)/include/generated/uapi \
                    -include $(srctree)/include/linux/kconfig.h
    
    # Use LINUXINCLUDE when you must reference the include/ directory.
    # Needed to be compatible with the O= option
    LINUXINCLUDE    := \
    		-I$(srctree)/arch/$(SRCARCH)/include \
    		-I$(objtree)/arch/$(SRCARCH)/include/generated \
    		$(if $(building_out_of_srctree),-I$(srctree)/include) \
    		-I$(objtree)/include \
    		$(USERINCLUDE)
    
    KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
    KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
    		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
    		   -Werror=implicit-function-declaration -Werror=implicit-int \
    		   -Wno-format-security \
    		   -std=gnu89
    KBUILD_CPPFLAGS := -D__KERNEL__
    KBUILD_AFLAGS_KERNEL :=
    KBUILD_CFLAGS_KERNEL :=
    KBUILD_AFLAGS_MODULE  := -DMODULE
    KBUILD_CFLAGS_MODULE  := -DMODULE
    KBUILD_LDFLAGS_MODULE :=
    export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
    KBUILD_LDFLAGS :=
    GCC_PLUGINS_CFLAGS :=
    CLANG_FLAGS :=
    
    export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
    export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
    export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
    export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ
    export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
    
    export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
    export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
    export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN
    export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
    export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
    export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
    
    # Files to ignore in find ... statements
    
    export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
    			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
    			  -prune -o
    export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
    			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
    
    # ===========================================================================
    # Rules shared between *config targets and build targets
    
    # Basic helpers built in scripts/basic/
    PHONY += scripts_basic
    scripts_basic:
    	$(Q)$(MAKE) $(build)=scripts/basic
    	$(Q)rm -f .tmp_quiet_recordmcount
    
    PHONY += outputmakefile
    # Before starting out-of-tree build, make sure the source tree is clean.
    # outputmakefile generates a Makefile in the output directory, if using a
    # separate output directory. This allows convenient use of make in the
    # output directory.
    # At the same time when output Makefile generated, generate .gitignore to
    # ignore whole output directory
    outputmakefile:
    ifdef building_out_of_srctree
    	$(Q)if [ -f $(srctree)/.config -o \
    		 -d $(srctree)/include/config -o \
    		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
    		echo >&2 "***"; \
    		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
    		echo >&2 "*** in $(abs_srctree)";\
    		echo >&2 "***"; \
    		false; \
    	fi
    	$(Q)ln -fsn $(srctree) source
    	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
    	$(Q)test -e .gitignore || \
    	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
    endif
    
    ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
    ifneq ($(CROSS_COMPILE),)
    CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
    GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
    CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
    GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
    endif
    ifneq ($(GCC_TOOLCHAIN),)
    CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
    endif
    ifneq ($(LLVM_IAS),1)
    CLANG_FLAGS	+= -no-integrated-as
    endif
    CLANG_FLAGS	+= -Werror=unknown-warning-option
    KBUILD_CFLAGS	+= $(CLANG_FLAGS)
    KBUILD_AFLAGS	+= $(CLANG_FLAGS)
    export CLANG_FLAGS
    endif
    
    # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
    # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
    # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
    # and from include/config/auto.conf.cmd to detect the compiler upgrade.
    CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
    
    ifdef config-build
    # ===========================================================================
    # *config targets only - make sure prerequisites are updated, and descend
    # in scripts/kconfig to make the *config target
    
    # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
    # KBUILD_DEFCONFIG may point out an alternative default configuration
    # used for 'make defconfig'
    include arch/$(SRCARCH)/Makefile
    export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
    
    config: outputmakefile scripts_basic FORCE
    	$(Q)$(MAKE) $(build)=scripts/kconfig $@
    
    %config: outputmakefile scripts_basic FORCE
    	$(Q)$(MAKE) $(build)=scripts/kconfig $@
    
    else #!config-build
    # ===========================================================================
    # Build targets only - this includes vmlinux, arch specific targets, clean
    # targets and others. In general all targets except *config targets.
    
    # If building an external module we do not care about the all: rule
    # but instead __all depend on modules
    PHONY += all
    ifeq ($(KBUILD_EXTMOD),)
    __all: all
    else
    __all: modules
    endif
    
    # Decide whether to build built-in, modular, or both.
    # Normally, just do built-in.
    
    KBUILD_MODULES :=
    KBUILD_BUILTIN := 1
    
    # If we have only "make modules", don't compile built-in objects.
    ifeq ($(MAKECMDGOALS),modules)
      KBUILD_BUILTIN :=
    endif
    
    # If we have "make <whatever> modules", compile modules
    # in addition to whatever we do anyway.
    # Just "make" or "make all" shall build modules as well
    
    ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
      KBUILD_MODULES := 1
    endif
    
    ifeq ($(MAKECMDGOALS),)
      KBUILD_MODULES := 1
    endif
    
    export KBUILD_MODULES KBUILD_BUILTIN
    
    ifdef need-config
    include include/config/auto.conf
    endif
    
    ifeq ($(KBUILD_EXTMOD),)
    # Objects we will link into vmlinux / subdirs we need to visit
    core-y		:= init/ usr/
    drivers-y	:= drivers/ sound/
    drivers-$(CONFIG_SAMPLES) += samples/
    drivers-y	+= net/ virt/
    libs-y		:= lib/
    endif # KBUILD_EXTMOD
    
    # The all: target is the default when no target is given on the
    # command line.
    # This allow a user to issue only 'make' to build a kernel including modules
    # Defaults to vmlinux, but the arch makefile usually adds further targets
    all: vmlinux
    
    CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
    	$(call cc-option,-fno-tree-loop-im) \
    	$(call cc-disable-warning,maybe-uninitialized,)
    export CFLAGS_GCOV
    
    # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
    ifdef CONFIG_FUNCTION_TRACER
      CC_FLAGS_FTRACE := -pg
    endif
    
    RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
    RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
    RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
    RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
    RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
    RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
    export RETPOLINE_CFLAGS
    export RETPOLINE_VDSO_CFLAGS
    
    include arch/$(SRCARCH)/Makefile
    
    ifdef need-config
    ifdef may-sync-config
    # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
    # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
    # because some architectures define CROSS_COMPILE there.
    include include/config/auto.conf.cmd
    
    $(KCONFIG_CONFIG):
    	@echo >&2 '***'
    	@echo >&2 '*** Configuration file "$@" not found!'
    	@echo >&2 '***'
    	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
    	@echo >&2 '*** "make menuconfig" or "make xconfig").'
    	@echo >&2 '***'
    	@/bin/false
    
    # The actual configuration files used during the build are stored in
    # include/generated/ and include/config/. Update them if .config is newer than
    # include/config/auto.conf (which mirrors .config).
    #
    # This exploits the 'multi-target pattern rule' trick.
    # The syncconfig should be executed only once to make all the targets.
    # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
    %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
    	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
    else # !may-sync-config
    # External modules and some install targets need include/generated/autoconf.h
    # and include/config/auto.conf but do not care if they are up-to-date.
    # Use auto.conf to trigger the test
    PHONY += include/config/auto.conf
    
    include/config/auto.conf:
    	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
    	echo >&2;							\
    	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
    	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
    	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
    	echo >&2 ;							\
    	/bin/false)
    
    endif # may-sync-config
    endif # need-config
    
    KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
    KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
    KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
    KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
    KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
    
    ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
    KBUILD_CFLAGS += -O2
    else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
    KBUILD_CFLAGS += -O3
    else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
    KBUILD_CFLAGS += -Os
    endif
    
    # Tell gcc to never replace conditional load with a non-conditional one
    KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
    KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
    
    include scripts/Makefile.kcov
    include scripts/Makefile.gcc-plugins
    
    ifdef CONFIG_READABLE_ASM
    # Disable optimizations that make assembler listings hard to read.
    # reorder blocks reorders the control in the function
    # ipa clone creates specialized cloned functions
    # partial inlining inlines only parts of functions
    KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
                     $(call cc-option,-fno-ipa-cp-clone,) \
                     $(call cc-option,-fno-partial-inlining)
    endif
    
    ifneq ($(CONFIG_FRAME_WARN),0)
    KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
    endif
    
    stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
    stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
    stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
    
    KBUILD_CFLAGS += $(stackp-flags-y)
    
    ifdef CONFIG_CC_IS_CLANG
    KBUILD_CPPFLAGS += -Qunused-arguments
    KBUILD_CFLAGS += -Wno-format-invalid-specifier
    KBUILD_CFLAGS += -Wno-gnu
    # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
    # source of a reference will be _MergedGlobals and not on of the whitelisted names.
    # See modpost pattern 2
    KBUILD_CFLAGS += -mno-global-merge
    else
    
    # These warnings generated too much noise in a regular build.
    # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
    KBUILD_CFLAGS += -Wno-unused-but-set-variable
    
    # Warn about unmarked fall-throughs in switch statement.
    # Disabled for clang while comment to attribute conversion happens and
    # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
    KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
    endif
    
    KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
    ifdef CONFIG_FRAME_POINTER
    KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
    else
    # Some targets (ARM with Thumb2, for example), can't be built with frame
    # pointers.  For those, we don't have FUNCTION_TRACER automatically
    # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
    # incompatible with -fomit-frame-pointer with current GCC, so we don't use
    # -fomit-frame-pointer with FUNCTION_TRACER.
    ifndef CONFIG_FUNCTION_TRACER
    KBUILD_CFLAGS	+= -fomit-frame-pointer
    endif
    endif
    
    # Initialize all stack variables with a pattern, if desired.
    ifdef CONFIG_INIT_STACK_ALL
    KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
    endif
    
    DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
    
    ifdef CONFIG_DEBUG_INFO
    ifdef CONFIG_DEBUG_INFO_SPLIT
    DEBUG_CFLAGS	+= -gsplit-dwarf
    else
    DEBUG_CFLAGS	+= -g
    endif
    KBUILD_AFLAGS	+= -Wa,-gdwarf-2
    endif
    ifdef CONFIG_DEBUG_INFO_DWARF4
    DEBUG_CFLAGS	+= -gdwarf-4
    endif
    
    ifdef CONFIG_DEBUG_INFO_REDUCED
    DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
    		   $(call cc-option,-fno-var-tracking)
    endif
    
    ifdef CONFIG_DEBUG_INFO_COMPRESSED
    DEBUG_CFLAGS	+= -gz=zlib
    KBUILD_AFLAGS	+= -gz=zlib
    KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
    endif
    
    KBUILD_CFLAGS += $(DEBUG_CFLAGS)
    export DEBUG_CFLAGS
    
    ifdef CONFIG_FUNCTION_TRACER
    ifdef CONFIG_FTRACE_MCOUNT_RECORD
      # gcc 5 supports generating the mcount tables directly
      ifeq ($(call cc-option-yn,-mrecord-mcount),y)
        CC_FLAGS_FTRACE	+= -mrecord-mcount
        export CC_USING_RECORD_MCOUNT := 1
      endif
      ifdef CONFIG_HAVE_NOP_MCOUNT
        ifeq ($(call cc-option-yn, -mnop-mcount),y)
          CC_FLAGS_FTRACE	+= -mnop-mcount
          CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
        endif
      endif
    endif
    ifdef CONFIG_HAVE_FENTRY
      ifeq ($(call cc-option-yn, -mfentry),y)
        CC_FLAGS_FTRACE	+= -mfentry
        CC_FLAGS_USING	+= -DCC_USING_FENTRY
      endif
    endif
    export CC_FLAGS_FTRACE
    KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
    KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
    ifdef CONFIG_DYNAMIC_FTRACE
    	ifdef CONFIG_HAVE_C_RECORDMCOUNT
    		BUILD_C_RECORDMCOUNT := y
    		export BUILD_C_RECORDMCOUNT
    	endif
    endif
    endif
    
    # We trigger additional mismatches with less inlining
    ifdef CONFIG_DEBUG_SECTION_MISMATCH
    KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
    endif
    
    ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
    KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
    LDFLAGS_vmlinux += --gc-sections
    endif
    
    ifdef CONFIG_LIVEPATCH
    KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
    endif
    
    ifdef CONFIG_SHADOW_CALL_STACK
    CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
    KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
    export CC_FLAGS_SCS
    endif
    
    # arch Makefile may override CC so keep this after arch Makefile is included
    NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
    
    # warn about C99 declaration after statement
    KBUILD_CFLAGS += -Wdeclaration-after-statement
    
    # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
    KBUILD_CFLAGS += -Wvla
    
    # disable pointer signed / unsigned warnings in gcc 4.0
    KBUILD_CFLAGS += -Wno-pointer-sign
    
    # disable stringop warnings in gcc 8+
    KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
    
    # We'll want to enable this eventually, but it's not going away for 5.7 at least
    KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
    KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
    KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
    
    # Another good warning that we'll want to enable eventually
    KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
    
    # Enabled with W=2, disabled by default as noisy
    KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
    
    # disable invalid "can't wrap" optimizations for signed / pointers
    KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
    
    # clang sets -fmerge-all-constants by default as optimization, but this
    # is non-conforming behavior for C and in fact breaks the kernel, so we
    # need to disable it here generally.
    KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
    
    # for gcc -fno-merge-all-constants disables everything, but it is fine
    # to have actual conforming behavior enabled.
    KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
    
    # Make sure -fstack-check isn't enabled (like gentoo apparently did)
    KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
    
    # conserve stack if available
    KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
    
    # Prohibit date/time macros, which would make the build non-deterministic
    KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
    
    # enforce correct pointer usage
    KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
    
    # Require designated initializers for all marked structures
    KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
    
    # change __FILE__ to the relative path from the srctree
    KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
    
    # ensure -fcf-protection is disabled when using retpoline as it is
    # incompatible with -mindirect-branch=thunk-extern
    ifdef CONFIG_RETPOLINE
    KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
    endif
    
    include scripts/Makefile.kasan
    include scripts/Makefile.extrawarn
    include scripts/Makefile.ubsan
    include scripts/Makefile.kcsan
    
    # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
    KBUILD_CPPFLAGS += $(KCPPFLAGS)
    KBUILD_AFLAGS   += $(KAFLAGS)
    KBUILD_CFLAGS   += $(KCFLAGS)
    
    KBUILD_LDFLAGS_MODULE += --build-id
    LDFLAGS_vmlinux += --build-id
    
    ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
    LDFLAGS_vmlinux	+= $(call ld-option, -X,)
    endif
    
    ifeq ($(CONFIG_RELR),y)
    LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
    endif
    
    # Align the bit size of userspace programs with the kernel
    KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
    KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
    
    # make the checker run with the right architecture
    CHECKFLAGS += --arch=$(ARCH)
    
    # insure the checker run with the right endianness
    CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
    
    # the checker needs the correct machine size
    CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
    
    # Default kernel image to build when no specific target is given.
    # KBUILD_IMAGE may be overruled on the command line or
    # set in the environment
    # Also any assignments in arch/$(ARCH)/Makefile take precedence over
    # this default value
    export KBUILD_IMAGE ?= vmlinux
    
    #
    # INSTALL_PATH specifies where to place the updated kernel and system map
    # images. Default is /boot, but you can set it to other values
    export	INSTALL_PATH ?= /boot
    
    #
    # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
    # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
    # an argument if needed. Otherwise it defaults to the kernel install path
    #
    export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
    
    #
    # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
    # relocations required by build roots.  This is not defined in the
    # makefile but the argument can be passed to make if needed.
    #
    
    MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
    export MODLIB
    
    #
    # INSTALL_MOD_STRIP, if defined, will cause modules to be
    # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
    # the default option --strip-debug will be used.  Otherwise,
    # INSTALL_MOD_STRIP value will be used as the options to the strip command.
    
    ifdef INSTALL_MOD_STRIP
    ifeq ($(INSTALL_MOD_STRIP),1)
    mod_strip_cmd = $(STRIP) --strip-debug
    else
    mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
    endif # INSTALL_MOD_STRIP=1
    else
    mod_strip_cmd = true
    endif # INSTALL_MOD_STRIP
    export mod_strip_cmd
    
    # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
    # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
    # or CONFIG_MODULE_COMPRESS_XZ.
    
    mod_compress_cmd = true
    ifdef CONFIG_MODULE_COMPRESS
      ifdef CONFIG_MODULE_COMPRESS_GZIP
        mod_compress_cmd = $(KGZIP) -n -f
      endif # CONFIG_MODULE_COMPRESS_GZIP
      ifdef CONFIG_MODULE_COMPRESS_XZ
        mod_compress_cmd = $(XZ) -f
      endif # CONFIG_MODULE_COMPRESS_XZ
    endif # CONFIG_MODULE_COMPRESS
    export mod_compress_cmd
    
    ifdef CONFIG_MODULE_SIG_ALL
    $(eval $(call config_filename,MODULE_SIG_KEY))
    
    mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
    else
    mod_sign_cmd = true
    endif
    export mod_sign_cmd
    
    HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
    
    ifdef CONFIG_STACK_VALIDATION
      has_libelf := $(call try-run,\
    		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
      ifeq ($(has_libelf),1)
        objtool_target := tools/objtool FORCE
      else
        SKIP_STACK_VALIDATION := 1
        export SKIP_STACK_VALIDATION
      endif
    endif
    
    PHONY += prepare0
    
    export MODORDER := $(extmod-prefix)modules.order
    export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
    
    ifeq ($(KBUILD_EXTMOD),)
    core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
    
    vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
    		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
    		     $(libs-y) $(libs-m)))
    
    vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
    		     $(patsubst %/,%,$(filter %/, $(core-) \
    			$(drivers-) $(libs-))))
    
    subdir-modorder := $(addsuffix modules.order,$(filter %/, \
    			$(core-y) $(core-m) $(libs-y) $(libs-m) \
    			$(drivers-y) $(drivers-m)))
    
    build-dirs	:= $(vmlinux-dirs)
    clean-dirs	:= $(vmlinux-alldirs)
    
    # Externally visible symbols (used by link-vmlinux.sh)
    KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
    KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
    ifdef CONFIG_MODULES
    KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
    KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
    else
    KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
    endif
    KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
    
    export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
    export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
    export LDFLAGS_vmlinux
    # used by scripts/Makefile.package
    export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
    
    vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
    
    # Recurse until adjust_autoksyms.sh is satisfied
    PHONY += autoksyms_recursive
    ifdef CONFIG_TRIM_UNUSED_KSYMS
    # For the kernel to actually contain only the needed exported symbols,
    # we have to build modules as well to determine what those symbols are.
    # (this can be evaluated only once include/config/auto.conf has been included)
    KBUILD_MODULES := 1
    
    autoksyms_recursive: descend modules.order
    	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
    	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
    endif
    
    autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
    
    quiet_cmd_autoksyms_h = GEN     $@
          cmd_autoksyms_h = mkdir -p $(dir $@); \
    			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
    
    $(autoksyms_h):
    	$(call cmd,autoksyms_h)
    
    ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
    
    # Final link of vmlinux with optional arch pass after final link
    cmd_link-vmlinux =                                                 \
    	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
    	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
    
    vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
    	+$(call if_changed,link-vmlinux)
    
    targets := vmlinux
    
    # The actual objects are generated when descending,
    # make sure no implicit rule kicks in
    $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
    
    filechk_kernel.release = \
    	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
    
    # Store (new) KERNELRELEASE string in include/config/kernel.release
    include/config/kernel.release: FORCE
    	$(call filechk,kernel.release)
    
    # Additional helpers built in scripts/
    # Carefully list dependencies so we do not try to build scripts twice
    # in parallel
    PHONY += scripts
    scripts: scripts_basic scripts_dtc
    	$(Q)$(MAKE) $(build)=$(@)
    
    # Things we need to do before we recursively start building the kernel
    # or the modules are listed in "prepare".
    # A multi level approach is used. prepareN is processed before prepareN-1.
    # archprepare is used in arch Makefiles and when processed asm symlink,
    # version.h and scripts_basic is processed / created.
    
    PHONY += prepare archprepare
    
    archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
    	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
    	include/generated/autoconf.h
    
    prepare0: archprepare
    	$(Q)$(MAKE) $(build)=scripts/mod
    	$(Q)$(MAKE) $(build)=.
    
    # All the preparing..
    prepare: prepare0 prepare-objtool
    
    # Support for using generic headers in asm-generic
    asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
    
    PHONY += asm-generic uapi-asm-generic
    asm-generic: uapi-asm-generic
    	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
    	generic=include/asm-generic
    uapi-asm-generic:
    	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
    	generic=include/uapi/asm-generic
    
    PHONY += prepare-objtool
    prepare-objtool: $(objtool_target)
    ifeq ($(SKIP_STACK_VALIDATION),1)
    ifdef CONFIG_UNWINDER_ORC
    	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
    	@false
    else
    	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
    endif
    endif
    
    # Generate some files
    # ---------------------------------------------------------------------------
    
    # KERNELRELEASE can change from a few different places, meaning version.h
    # needs to be updated, so this check is forced on all builds
    
    uts_len := 64
    define filechk_utsrelease.h
    	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
    	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
    	  exit 1;                                                         \
    	fi;                                                               \
    	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
    endef
    
    define filechk_version.h
    	echo \#define LINUX_VERSION_CODE $(shell                         \
    	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
    	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
    endef
    
    $(version_h): FORCE
    	$(call filechk,version.h)
    	$(Q)rm -f $(old_version_h)
    
    include/generated/utsrelease.h: include/config/kernel.release FORCE
    	$(call filechk,utsrelease.h)
    
    PHONY += headerdep
    headerdep:
    	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
    	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
    
    # ---------------------------------------------------------------------------
    # Kernel headers
    
    #Default location for installed headers
    export INSTALL_HDR_PATH = $(objtree)/usr
    
    quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
          cmd_headers_install = \
    	mkdir -p $(INSTALL_HDR_PATH); \
    	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
    	usr/include $(INSTALL_HDR_PATH)
    
    PHONY += headers_install
    headers_install: headers
    	$(call cmd,headers_install)
    
    PHONY += archheaders archscripts
    
    hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
    
    PHONY += headers
    headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
    	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
    	  $(error Headers not exportable for the $(SRCARCH) architecture))
    	$(Q)$(MAKE) $(hdr-inst)=include/uapi
    	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
    
    # Deprecated. It is no-op now.
    PHONY += headers_check
    headers_check:
    	@:
    
    ifdef CONFIG_HEADERS_INSTALL
    prepare: headers
    endif
    
    PHONY += scripts_unifdef
    scripts_unifdef: scripts_basic
    	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
    
    # ---------------------------------------------------------------------------
    # Kernel selftest
    
    PHONY += kselftest
    kselftest:
    	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
    
    kselftest-%: FORCE
    	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
    
    PHONY += kselftest-merge
    kselftest-merge:
    	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
    	$(Q)find $(srctree)/tools/testing/selftests -name config | \
    		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
    	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
    
    # ---------------------------------------------------------------------------
    # Devicetree files
    
    ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
    dtstree := arch/$(SRCARCH)/boot/dts
    endif
    
    ifneq ($(dtstree),)
    
    %.dtb: include/config/kernel.release scripts_dtc
    	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
    
    PHONY += dtbs dtbs_install dtbs_check
    dtbs: include/config/kernel.release scripts_dtc
    	$(Q)$(MAKE) $(build)=$(dtstree)
    
    ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
    export CHECK_DTBS=y
    dtbs: dt_binding_check
    endif
    
    dtbs_check: dtbs
    
    dtbs_install:
    	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
    
    ifdef CONFIG_OF_EARLY_FLATTREE
    all: dtbs
    endif
    
    endif
    
    PHONY += scripts_dtc
    scripts_dtc: scripts_basic
    	$(Q)$(MAKE) $(build)=scripts/dtc
    
    ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
    export CHECK_DT_BINDING=y
    endif
    
    PHONY += dt_binding_check
    dt_binding_check: scripts_dtc
    	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
    
    # ---------------------------------------------------------------------------
    # Modules
    
    ifdef CONFIG_MODULES
    
    # By default, build modules as well
    
    all: modules
    
    # When we're building modules with modversions, we need to consider
    # the built-in objects during the descend as well, in order to
    # make sure the checksums are up to date before we record them.
    ifdef CONFIG_MODVERSIONS
      KBUILD_BUILTIN := 1
    endif
    
    # Build modules
    #
    # A module can be listed more than once in obj-m resulting in
    # duplicate lines in modules.order files.  Those are removed
    # using awk while concatenating to the final file.
    
    PHONY += modules
    modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
    	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
    
    PHONY += modules_check
    modules_check: modules.order
    	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
    
    cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
    
    modules.order: $(subdir-modorder) FORCE
    	$(call if_changed,modules_order)
    
    targets += modules.order
    
    # Target to prepare building external modules
    PHONY += modules_prepare
    modules_prepare: prepare
    
    # Target to install modules
    PHONY += modules_install
    modules_install: _modinst_ _modinst_post
    
    PHONY += _modinst_
    _modinst_:
    	@rm -rf $(MODLIB)/kernel
    	@rm -f $(MODLIB)/source
    	@mkdir -p $(MODLIB)/kernel
    	@ln -s $(abspath $(srctree)) $(MODLIB)/source
    	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
    		rm -f $(MODLIB)/build ; \
    		ln -s $(CURDIR) $(MODLIB)/build ; \
    	fi
    	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
    	@cp -f modules.builtin $(MODLIB)/
    	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
    	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
    
    # This depmod is only for convenience to give the initial
    # boot a modules.dep even before / is mounted read-write.  However the
    # boot script depmod is the master version.
    PHONY += _modinst_post
    _modinst_post: _modinst_
    	$(call cmd,depmod)
    
    ifeq ($(CONFIG_MODULE_SIG), y)
    PHONY += modules_sign
    modules_sign:
    	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
    endif
    
    else # CONFIG_MODULES
    
    # Modules not configured
    # ---------------------------------------------------------------------------
    
    PHONY += modules modules_install
    modules modules_install:
    	@echo >&2
    	@echo >&2 "The present kernel configuration has modules disabled."
    	@echo >&2 "Type 'make config' and enable loadable module support."
    	@echo >&2 "Then build a kernel with module support enabled."
    	@echo >&2
    	@exit 1
    
    endif # CONFIG_MODULES
    
    ###
    # Cleaning is done on three levels.
    # make clean     Delete most generated files
    #                Leave enough to build external modules
    # make mrproper  Delete the current configuration, and all generated files
    # make distclean Remove editor backup files, patch leftover files and the like
    
    # Directories & files removed with 'make clean'
    CLEAN_FILES += include/ksym vmlinux.symvers \
    	       modules.builtin modules.builtin.modinfo modules.nsdeps
    
    # Directories & files removed with 'make mrproper'
    MRPROPER_FILES += include/config include/generated          \
    		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
    		  debian snap tar-install \
    		  .config .config.old .version \
    		  Module.symvers \
    		  signing_key.pem signing_key.priv signing_key.x509	\
    		  x509.genkey extra_certificates signing_key.x509.keyid	\
    		  signing_key.x509.signer vmlinux-gdb.py \
    		  *.spec
    
    # Directories & files removed with 'make distclean'
    DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
    
    # clean - Delete most, but leave enough to build external modules
    #
    clean: rm-files := $(CLEAN_FILES)
    
    PHONY += archclean vmlinuxclean
    
    vmlinuxclean:
    	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
    	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
    
    clean: archclean vmlinuxclean
    
    # mrproper - Delete all generated files, including .config
    #
    mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
    mrproper-dirs      := $(addprefix _mrproper_,scripts)
    
    PHONY += $(mrproper-dirs) mrproper
    $(mrproper-dirs):
    	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
    
    mrproper: clean $(mrproper-dirs)
    	$(call cmd,rmfiles)
    
    # distclean
    #
    distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
    
    PHONY += distclean
    
    distclean: mrproper
    	$(call cmd,rmfiles)
    	@find $(srctree) $(RCS_FIND_IGNORE) \
    		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
    		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
    		-o -name 'core' \) \
    		-type f -print | xargs rm -f
    
    
    # Packaging of the kernel to various formats
    # ---------------------------------------------------------------------------
    
    %src-pkg: FORCE
    	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
    %pkg: include/config/kernel.release FORCE
    	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
    
    # Brief documentation of the typical targets used
    # ---------------------------------------------------------------------------
    
    boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
    boards := $(sort $(notdir $(boards)))
    board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
    board-dirs := $(sort $(notdir $(board-dirs:/=)))
    
    PHONY += help
    help:
    	@echo  'Cleaning targets:'
    	@echo  '  clean		  - Remove most generated files but keep the config and'
    	@echo  '                    enough build support to build external modules'
    	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
    	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
    	@echo  ''
    	@echo  'Configuration targets:'
    	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
    	@echo  ''
    	@echo  'Other generic targets:'
    	@echo  '  all		  - Build all targets marked with [*]'
    	@echo  '* vmlinux	  - Build the bare kernel'
    	@echo  '* modules	  - Build all modules'
    	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
    	@echo  '  dir/            - Build all files in dir and below'
    	@echo  '  dir/file.[ois]  - Build specified target only'
    	@echo  '  dir/file.ll     - Build the LLVM assembly file'
    	@echo  '                    (requires compiler support for LLVM assembly generation)'
    	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
    	@echo  '                    (requires a recent binutils and recent build (System.map))'
    	@echo  '  dir/file.ko     - Build module including final link'
    	@echo  '  modules_prepare - Set up for building external modules'
    	@echo  '  tags/TAGS	  - Generate tags file for editors'
    	@echo  '  cscope	  - Generate cscope index'
    	@echo  '  gtags           - Generate GNU GLOBAL index'
    	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
    	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
    	@echo  '  image_name	  - Output the image name (use with make -s)'
    	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
    	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
    	 echo  ''
    	@echo  'Static analysers:'
    	@echo  '  checkstack      - Generate a list of stack hogs'
    	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
    	@echo  '  versioncheck    - Sanity check on version.h usage'
    	@echo  '  includecheck    - Check for duplicate included header files'
    	@echo  '  export_report   - List the usages of all exported symbols'
    	@echo  '  headerdep       - Detect inclusion cycles in headers'
    	@echo  '  coccicheck      - Check with Coccinelle'
    	@echo  ''
    	@echo  'Tools:'
    	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
    	@echo  ''
    	@echo  'Kernel selftest:'
    	@echo  '  kselftest         - Build and run kernel selftest'
    	@echo  '                      Build, install, and boot kernel before'
    	@echo  '                      running kselftest on it'
    	@echo  '                      Run as root for full coverage'
    	@echo  '  kselftest-all     - Build kernel selftest'
    	@echo  '  kselftest-install - Build and install kernel selftest'
    	@echo  '  kselftest-clean   - Remove all generated kselftest files'
    	@echo  '  kselftest-merge   - Merge all the config dependencies of'
    	@echo  '		      kselftest to existing .config.'
    	@echo  ''
    	@$(if $(dtstree), \
    		echo 'Devicetree:'; \
    		echo '* dtbs             - Build device tree blobs for enabled boards'; \
    		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
    		echo '  dt_binding_check - Validate device tree binding documents'; \
    		echo '  dtbs_check       - Validate device tree source files';\
    		echo '')
    
    	@echo 'Userspace tools targets:'
    	@echo '  use "make tools/help"'
    	@echo '  or  "cd tools; make help"'
    	@echo  ''
    	@echo  'Kernel packaging:'
    	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
    	@echo  ''
    	@echo  'Documentation targets:'
    	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
    	@echo  ''
    	@echo  'Architecture specific targets ($(SRCARCH)):'
    	@$(if $(archhelp),$(archhelp),\
    		echo '  No architecture specific help defined for $(SRCARCH)')
    	@echo  ''
    	@$(if $(boards), \
    		$(foreach b, $(boards), \
    		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
    		echo '')
    	@$(if $(board-dirs), \
    		$(foreach b, $(board-dirs), \
    		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
    		printf "  %-16s - Show all of the above\\n" help-boards; \
    		echo '')
    
    	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
    	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
    	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
    	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
    	@echo  '                       (sparse by default)'
    	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
    	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
    	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
    	@echo  '		1: warnings which may be relevant and do not occur too often'
    	@echo  '		2: warnings which occur quite often but may still be relevant'
    	@echo  '		3: more obscure warnings, can most likely be ignored'
    	@echo  '		Multiple levels can be combined with W=12 or W=123'
    	@echo  ''
    	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
    	@echo  'For further info see the ./README file'
    
    
    help-board-dirs := $(addprefix help-,$(board-dirs))
    
    help-boards: $(help-board-dirs)
    
    boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
    
    $(help-board-dirs): help-%:
    	@echo  'Architecture specific targets ($(SRCARCH) $*):'
    	@$(if $(boards-per-dir), \
    		$(foreach b, $(boards-per-dir), \
    		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
    		echo '')
    
    
    # Documentation targets
    # ---------------------------------------------------------------------------
    DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
    	       linkcheckdocs dochelp refcheckdocs
    PHONY += $(DOC_TARGETS)
    $(DOC_TARGETS):
    	$(Q)$(MAKE) $(build)=Documentation $@
    
    # Misc
    # ---------------------------------------------------------------------------
    
    PHONY += scripts_gdb
    scripts_gdb: prepare0
    	$(Q)$(MAKE) $(build)=scripts/gdb
    	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
    
    ifdef CONFIG_GDB_SCRIPTS
    all: scripts_gdb
    endif
    
    else # KBUILD_EXTMOD
    
    ###
    # External module support.
    # When building external modules the kernel used as basis is considered
    # read-only, and no consistency checks are made and the make
    # system is not used on the basis kernel. If updates are required
    # in the basis kernel ordinary make commands (without M=...) must
    # be used.
    #
    # The following are the only valid targets when building external
    # modules.
    # make M=dir clean     Delete all automatically generated files
    # make M=dir modules   Make all modules in specified dir
    # make M=dir	       Same as 'make M=dir modules'
    # make M=dir modules_install
    #                      Install the modules built in the module directory
    #                      Assumes install directory is already created
    
    # We are always building modules
    KBUILD_MODULES := 1
    
    build-dirs := $(KBUILD_EXTMOD)
    PHONY += modules
    modules: descend
    	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
    
    PHONY += modules_install
    modules_install: _emodinst_ _emodinst_post
    
    install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
    PHONY += _emodinst_
    _emodinst_:
    	$(Q)mkdir -p $(MODLIB)/$(install-dir)
    	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
    
    PHONY += _emodinst_post
    _emodinst_post: _emodinst_
    	$(call cmd,depmod)
    
    clean-dirs := $(KBUILD_EXTMOD)
    clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
    
    PHONY += help
    help:
    	@echo  '  Building external modules.'
    	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
    	@echo  ''
    	@echo  '  modules         - default target, build the module(s)'
    	@echo  '  modules_install - install the module'
    	@echo  '  clean           - remove generated files in module directory only'
    	@echo  ''
    
    PHONY += prepare
    endif # KBUILD_EXTMOD
    
    # Single targets
    # ---------------------------------------------------------------------------
    # To build individual files in subdirectories, you can do like this:
    #
    #   make foo/bar/baz.s
    #
    # The supported suffixes for single-target are listed in 'single-targets'
    #
    # To build only under specific subdirectories, you can do like this:
    #
    #   make foo/bar/baz/
    
    ifdef single-build
    
    # .ko is special because modpost is needed
    single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
    single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
    
    $(single-ko): single_modpost
    	@:
    $(single-no-ko): descend
    	@:
    
    ifeq ($(KBUILD_EXTMOD),)
    # For the single build of in-tree modules, use a temporary file to avoid
    # the situation of modules_install installing an invalid modules.order.
    MODORDER := .modules.tmp
    endif
    
    PHONY += single_modpost
    single_modpost: $(single-no-ko)
    	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
    	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
    
    KBUILD_MODULES := 1
    
    export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
    
    # trim unrelated directories
    build-dirs := $(foreach d, $(build-dirs), \
    			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
    
    endif
    
    ifndef CONFIG_MODULES
    KBUILD_MODULES :=
    endif
    
    # Handle descending into subdirectories listed in $(build-dirs)
    # Preset locale variables to speed up the build process. Limit locale
    # tweaks to this spot to avoid wrong language settings when running
    # make menuconfig etc.
    # Error messages still appears in the original language
    PHONY += descend $(build-dirs)
    descend: $(build-dirs)
    $(build-dirs): prepare
    	$(Q)$(MAKE) $(build)=$@ \
    	single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
    	need-builtin=1 need-modorder=1
    
    clean-dirs := $(addprefix _clean_, $(clean-dirs))
    PHONY += $(clean-dirs) clean
    $(clean-dirs):
    	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
    
    clean: $(clean-dirs)
    	$(call cmd,rmfiles)
    	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
    		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
    		-o -name '*.ko.*' \
    		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
    		-o -name '*.dwo' -o -name '*.lst' \
    		-o -name '*.su' -o -name '*.mod' \
    		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
    		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
    		-o -name '*.asn1.[ch]' \
    		-o -name '*.symtypes' -o -name 'modules.order' \
    		-o -name '.tmp_*.o.*' \
    		-o -name '*.c.[012]*.*' \
    		-o -name '*.ll' \
    		-o -name '*.gcno' \) -type f -print | xargs rm -f
    
    # Generate tags for editors
    # ---------------------------------------------------------------------------
    quiet_cmd_tags = GEN     $@
          cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
    
    tags TAGS cscope gtags: FORCE
    	$(call cmd,tags)
    
    # Script to generate missing namespace dependencies
    # ---------------------------------------------------------------------------
    
    PHONY += nsdeps
    nsdeps: export KBUILD_NSDEPS=1
    nsdeps: modules
    	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
    
    # Scripts to check various things for consistency
    # ---------------------------------------------------------------------------
    
    PHONY += includecheck versioncheck coccicheck namespacecheck export_report
    
    includecheck:
    	find $(srctree)/* $(RCS_FIND_IGNORE) \
    		-name '*.[hcS]' -type f -print | sort \
    		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
    
    versioncheck:
    	find $(srctree)/* $(RCS_FIND_IGNORE) \
    		-name '*.[hcS]' -type f -print | sort \
    		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
    
    coccicheck:
    	$(Q)$(BASH) $(srctree)/scripts/$@
    
    namespacecheck:
    	$(PERL) $(srctree)/scripts/namespace.pl
    
    export_report:
    	$(PERL) $(srctree)/scripts/export_report.pl
    
    PHONY += checkstack kernelrelease kernelversion image_name
    
    # UML needs a little special treatment here.  It wants to use the host
    # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
    # else wants $(ARCH), including people doing cross-builds, which means
    # that $(SUBARCH) doesn't work here.
    ifeq ($(ARCH), um)
    CHECKSTACK_ARCH := $(SUBARCH)
    else
    CHECKSTACK_ARCH := $(ARCH)
    endif
    checkstack:
    	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
    	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
    
    kernelrelease:
    	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
    
    kernelversion:
    	@echo $(KERNELVERSION)
    
    image_name:
    	@echo $(KBUILD_IMAGE)
    
    # Clear a bunch of variables before executing the submake
    
    ifeq ($(quiet),silent_)
    tools_silent=s
    endif
    
    tools/: FORCE
    	$(Q)mkdir -p $(objtree)/tools
    	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
    
    tools/%: FORCE
    	$(Q)mkdir -p $(objtree)/tools
    	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
    
    quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
          cmd_rmfiles = rm -rf $(rm-files)
    
    # Run depmod only if we have System.map and depmod is executable
    quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
          cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
                       $(KERNELRELEASE)
    
    # read saved command lines for existing targets
    existing-targets := $(wildcard $(sort $(targets)))
    
    -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
    
    endif # config-build
    endif # mixed-build
    endif # need-sub-make
    
    PHONY += FORCE
    FORCE:
    
    # Declare the contents of the PHONY variable as phony.  We keep that
    # information in a variable so we can use it in if_changed and friends.
    .PHONY: $(PHONY)