# SPDX-License-Identifier: GPL-2.0

  VERSION = 5

  PATCHLEVEL = 2

  SUBLEVEL = 0

  EXTRAVERSION =

  NAME = Bobtail Squid

  
  # *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.

  # 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.
  #

  # 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

  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.
  $(lastword $(MAKEFILE_LIST)): ;
  endif

  export abs_srctree abs_objtree

  export sub_make_done := 1

  ifeq ($(need-sub-make),1)

  PHONY += $(MAKECMDGOALS) sub-make

  $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(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 to specify directory of external module to build
  # Old syntax make ... SUBDIRS=$PWD is still supported
  # Setting the environment variable KBUILD_EXTMOD take precedence
  ifdef SUBDIRS

    $(warning ================= WARNING ================)
    $(warning 'SUBDIRS' will be removed after Linux 5.3)
    $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
    $(warning ==========================================)

    KBUILD_EXTMOD ?= $(SUBDIRS)
  endif
  
  ifeq ("$(origin M)", "command line")
    KBUILD_EXTMOD := $(M)
  endif

  ifeq ($(abs_srctree),$(abs_objtree))

          # building in the source tree
          srctree := .
  else

          ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))

                  # building in a subdirectory of the source tree
                  srctree := ..
          else

                  srctree := $(abs_srctree)

          endif

  
  	# TODO:
  	# KBUILD_SRC is only used to distinguish in-tree/out-of-tree build.
  	# Replace it with $(srctree) or something.
  	KBUILD_SRC := $(abs_srctree)

  endif

  
  export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC

  objtree		:= .

  src		:= $(srctree)
  obj		:= $(objtree)

  VPATH		:= $(srctree)

  export 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_% archheaders archscripts \

  			 %asm-generic kernelversion %src-pkg

  no-sync-config-targets := $(no-dot-config-targets) install %install \
  			   kernelrelease

  config-targets  := 0
  mixed-targets   := 0
  dot-config      := 1
  may-sync-config := 1

  
  ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
  	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
  		dot-config := 0
  	endif
  endif

  ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
  	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
  		may-sync-config := 0
  	endif
  endif
  
  ifneq ($(KBUILD_EXTMOD),)
  	may-sync-config := 0
  endif

  ifeq ($(KBUILD_EXTMOD),)
          ifneq ($(filter config %config,$(MAKECMDGOALS)),)
                  config-targets := 1
                  ifneq ($(words $(MAKECMDGOALS)),1)
                          mixed-targets := 1
                  endif
          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-targets := 1
          endif
  endif

  # install and modules_install need also be processed one by one
  ifneq ($(filter install,$(MAKECMDGOALS)),)
          ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
  	        mixed-targets := 1
          endif
  endif
  
  ifeq ($(mixed-targets),1)
  # ===========================================================================
  # We're called with mixed targets (*config and build targets).
  # Handle them one by one.
  
  PHONY += $(MAKECMDGOALS) __build_one_by_one
  
  $(filter-out __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

  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

  # SHELL used by kbuild
  CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  	  else if [ -x /bin/bash ]; then echo /bin/bash; \
  	  else echo sh; fi ; fi)

  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)

  HOSTCC       = gcc
  HOSTCXX      = g++

  KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \

  		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
  		$(HOSTCFLAGS)
  KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
  KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
  KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)

  # Make variables (CC, etc...)

  AS		= $(CROSS_COMPILE)as
  LD		= $(CROSS_COMPILE)ld
  CC		= $(CROSS_COMPILE)gcc
  CPP		= $(CC) -E
  AR		= $(CROSS_COMPILE)ar
  NM		= $(CROSS_COMPILE)nm
  STRIP		= $(CROSS_COMPILE)strip
  OBJCOPY		= $(CROSS_COMPILE)objcopy
  OBJDUMP		= $(CROSS_COMPILE)objdump

  PAHOLE		= pahole

  LEX		= flex
  YACC		= bison

  AWK		= awk

  INSTALLKERNEL  := installkernel

  DEPMOD		= /sbin/depmod

  PERL		= perl

  PYTHON		= python

  PYTHON2		= python2
  PYTHON3		= python3

  CHECK		= sparse

  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 $(filter .,$(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 := -T $(srctree)/scripts/module-common.lds

  KBUILD_LDFLAGS :=

  GCC_PLUGINS_CFLAGS :=

  export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC

  export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS

  export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE

  export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS

  export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS

  export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
  export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN

  export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE

  export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE

  export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL

  export KBUILD_ARFLAGS

  
  # When compiling out-of-tree modules, put MODVERDIR in the module
  # tree rather than in the kernel tree. The kernel tree might
  # even be read-only.
  export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions

  # 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

  # 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:

  ifneq ($(srctree),.)

  	$(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

  CLANG_FLAGS	+= -no-integrated-as
  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)

  ifeq ($(config-targets),1)
  # ===========================================================================
  # *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: scripts_basic outputmakefile FORCE

  	$(Q)$(MAKE) $(build)=scripts/kconfig $@
  
  %config: scripts_basic outputmakefile FORCE

  	$(Q)$(MAKE) $(build)=scripts/kconfig $@
  
  else
  # ===========================================================================
  # 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.
  # 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.
  
  ifeq ($(MAKECMDGOALS),modules)
    KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
  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 ($(filter all _all modules,$(MAKECMDGOALS)),)
    KBUILD_MODULES := 1
  endif
  
  ifeq ($(MAKECMDGOALS),)
    KBUILD_MODULES := 1
  endif
  
  export KBUILD_MODULES KBUILD_BUILTIN

  ifeq ($(dot-config),1)
  include include/config/auto.conf
  endif

  ifeq ($(KBUILD_EXTMOD),)

  # Objects we will link into vmlinux / subdirs we need to visit
  init-y		:= init/

  drivers-y	:= drivers/ sound/

  drivers-$(CONFIG_SAMPLES) += samples/

  net-y		:= net/
  libs-y		:= lib/
  core-y		:= usr/

  virt-y		:= virt/

  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

  # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
  # values of the respective KBUILD_* variables
  ARCH_CPPFLAGS :=
  ARCH_AFLAGS :=
  ARCH_CFLAGS :=
  include arch/$(SRCARCH)/Makefile

  ifeq ($(dot-config),1)

  ifeq ($(may-sync-config),1)

  # 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.
  %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)

  	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig

  else

  # 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 # $(dot-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_SIZE

  KBUILD_CFLAGS	+= -Os

  else
  KBUILD_CFLAGS   += -O2
  endif

  ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
  KBUILD_CFLAGS   += -Wno-maybe-uninitialized
  endif

  # Tell gcc to never replace conditional load with a non-conditional one
  KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

  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 += $(call cc-option,-Wframe-larger-than=${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

  # Quiet clang warning: comparison of unsigned expression < 0 is always false

  KBUILD_CFLAGS += -Wno-tautological-compare

  # 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

  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

  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

  # 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)

  # 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)/=)

  # use the deterministic mode of AR if available
  KBUILD_ARFLAGS := $(call ar-option,D)

  include scripts/Makefile.kasan
  include scripts/Makefile.extrawarn

  include scripts/Makefile.ubsan

  # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
  # last assignments
  KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
  KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
  KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)

  # Use --build-id when available.

  LDFLAGS_BUILD_ID := $(call ld-option, --build-id)

  KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)

  LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

  ifeq ($(CONFIG_STRIP_ASM_SYMS),y)

  LDFLAGS_vmlinux	+= $(call ld-option, -X,)

  endif

  # 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 = gzip -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

  ifeq ($(KBUILD_EXTMOD),)

  core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/

  
  vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
  		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \

  		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))

  vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
  		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
  			$(drivers-) $(net-) $(libs-) $(virt-))))

  init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
  core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
  drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
  net-y		:= $(patsubst %/, %/built-in.a, $(net-y))

  libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))

  libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
  virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))

  # Externally visible symbols (used by link-vmlinux.sh)

  export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
  			      $(drivers-y) $(net-y) $(virt-y)

  export KBUILD_VMLINUX_LIBS := $(libs-y1)

  export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds

  export LDFLAGS_vmlinux

  # used by scripts/package/Makefile

  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
  autoksyms_recursive: $(vmlinux-deps)

  ifdef CONFIG_TRIM_UNUSED_KSYMS

  	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \

  	  "$(MAKE) -f $(srctree)/Makefile vmlinux"

  endif

  # 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)
  ifdef CONFIG_TRIM_UNUSED_KSYMS
    KBUILD_MODULES := 1
  endif

  autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
  
  $(autoksyms_h):
  	$(Q)mkdir -p $(dir $@)
  	$(Q)touch $@

  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

  # Some samples need headers_install.

  samples: headers_install

  # The actual objects are generated when descending,

  # make sure no implicit rule kicks in

  $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;

  
  # Handle descending into subdirectories listed in $(vmlinux-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 += $(vmlinux-dirs)

  $(vmlinux-dirs): prepare

  	$(Q)$(MAKE) $(build)=$@ need-builtin=1

  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 prepare1 prepare3

  # prepare3 is used to check if we are building in a separate output directory,

  # and if so do:
  # 1) Check that make has not been executed in the kernel src $(srctree)

  prepare3: include/config/kernel.release

  ifneq ($(srctree),.)

  	@$(kecho) '  Using $(srctree) as source for kernel'

  	$(Q)if [ -f $(srctree)/.config -o \
  		 -d $(srctree)/include/config -o \
  		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \

  		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
  		echo >&2 "  in the '$(srctree)' directory.";\

  		/bin/false; \
  	fi;

  endif

  prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
  						include/generated/utsrelease.h

  	$(cmd_crmodverdir)

  archprepare: archheaders archscripts prepare1 scripts

  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

  # If we do an all arch process set dst to include/arch-$(SRCARCH)
  hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)

  PHONY += archheaders archscripts

  PHONY += __headers

  __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts

  	$(Q)$(MAKE) $(build)=scripts build_unifdef

  
  PHONY += headers_install_all

  headers_install_all:
  	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install

  PHONY += headers_install

  headers_install: __headers

  	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \

  	  $(error Headers not exportable for the $(SRCARCH) architecture))

  	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include

  	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)

  PHONY += headers_check_all
  headers_check_all: headers_install_all

  	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check

  PHONY += headers_check
  headers_check: headers_install

  	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1

  	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1

  ifdef CONFIG_HEADERS_CHECK
  all: headers_check
  endif

  # ---------------------------------------------------------------------------

  # Kernel selftest
  
  PHONY += kselftest
  kselftest:

  	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests

  PHONY += kselftest-clean

  kselftest-clean:

  	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean

  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: prepare3 scripts_dtc
  	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

  PHONY += dtbs dtbs_install dt_binding_check
  dtbs dtbs_check: prepare3 scripts_dtc

  	$(Q)$(MAKE) $(build)=$(dtstree)

  dtbs_check: export CHECK_DTBS=1
  dtbs_check: dt_binding_check

  dtbs_install:
  	$(Q)$(MAKE) $(dtbinst)=$(dtstree)
  
  ifdef CONFIG_OF_EARLY_FLATTREE
  all: dtbs
  endif
  
  endif
  
  PHONY += scripts_dtc
  scripts_dtc: scripts_basic
  	$(Q)$(MAKE) $(build)=scripts/dtc

  dt_binding_check: scripts_dtc
  	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

  # ---------------------------------------------------------------------------

  # Modules
  
  ifdef CONFIG_MODULES

  # By default, build modules as well

  all: modules

  # 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: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin

  	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order

  	@$(kecho) '  Building modules, stage 2.';

  	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost

  	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh

  modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
  	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

  %/modules.builtin: include/config/auto.conf include/config/tristate.conf

  	$(Q)$(MAKE) $(modbuiltin)=$*

  
  # 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

  	@cp -f $(objtree)/modules.order $(MODLIB)/

  	@cp -f $(objtree)/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_DIRS  += $(MODVERDIR) include/ksym

  CLEAN_FILES += modules.builtin.modinfo

  
  # Directories & files removed with 'make mrproper'

  MRPROPER_DIRS  += include/config usr/include include/generated          \

  		  arch/$(SRCARCH)/include/generated .tmp_objdiff

  MRPROPER_FILES += .config .config.old .version \

  		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \

  		  signing_key.pem signing_key.priv signing_key.x509	\
  		  x509.genkey extra_certificates signing_key.x509.keyid	\

  		  signing_key.x509.signer vmlinux-gdb.py

  
  # clean - Delete most, but leave enough to build external modules
  #
  clean: rm-dirs  := $(CLEAN_DIRS)
  clean: rm-files := $(CLEAN_FILES)

  clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))

  PHONY += $(clean-dirs) clean archclean vmlinuxclean

  $(clean-dirs):
  	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

  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-dirs  := $(wildcard $(MRPROPER_DIRS))
  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,rmdirs)
  	$(call cmd,rmfiles)
  
  # distclean
  #

  PHONY += distclean

  
  distclean: mrproper
  	@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
  # ---------------------------------------------------------------------------

  package-dir	:= scripts/package

  %src-pkg: FORCE
  	$(Q)$(MAKE) $(build)=$(package-dir) $@

  %pkg: include/config/kernel.release FORCE

  	$(Q)$(MAKE) $(build)=$(package-dir) $@

  
  
  # 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'