################################################################################
  #
  # Linux kernel target
  #
  ################################################################################
  
  LINUX_VERSION = $(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
  LINUX_LICENSE = GPLv2
  LINUX_LICENSE_FILES = COPYING
  
  define LINUX_HELP_CMDS
  	@echo '  linux-menuconfig       - Run Linux kernel menuconfig'
  	@echo '  linux-savedefconfig    - Run Linux kernel savedefconfig'
  	@echo '  linux-update-defconfig - Save the Linux configuration to the path specified'
  	@echo '                             by BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE'
  endef
  
  # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
  LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
  LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_LOCAL),y)
  LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH))
  LINUX_SITE_METHOD = local
  else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  LINUX_SITE_METHOD = git
  else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  LINUX_SITE_METHOD = hg
  else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
  LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  LINUX_SITE_METHOD = svn
  else
  LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  ifeq ($(BR2_LINUX_KERNEL_CUSTOM_VERSION),y)
  BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  endif
  # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  # to use the $(word) function. We support versions such as 4.0, 3.1,
  # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
  LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
  else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
  LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
  endif
  # release candidates are in testing/ subdir
  ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  LINUX_SITE := $(LINUX_SITE)/testing
  endif # -rc
  endif
  
  LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  
  # We rely on the generic package infrastructure to download and apply
  # remote patches (downloaded from ftp, http or https). For local
  # patches, we can't rely on that infrastructure, because there might
  # be directories in the patch list (unlike for other packages).
  LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
  
  LINUX_INSTALL_IMAGES = YES
  LINUX_DEPENDENCIES += host-kmod
  
  # host tools needed for kernel compression
  ifeq ($(BR2_LINUX_KERNEL_LZ4),y)
  LINUX_DEPENDENCIES += host-lz4
  else ifeq ($(BR2_LINUX_KERNEL_LZMA),y)
  LINUX_DEPENDENCIES += host-lzma
  else ifeq ($(BR2_LINUX_KERNEL_LZO),y)
  LINUX_DEPENDENCIES += host-lzop
  else ifeq ($(BR2_LINUX_KERNEL_XZ),y)
  LINUX_DEPENDENCIES += host-xz
  endif
  LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_GZIP) = CONFIG_KERNEL_GZIP
  LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZ4) = CONFIG_KERNEL_LZ4
  LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZMA) = CONFIG_KERNEL_LZMA
  LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZO) = CONFIG_KERNEL_LZO
  LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_XZ) = CONFIG_KERNEL_XZ
  
  ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
  LINUX_DEPENDENCIES += host-uboot-tools
  endif
  
  LINUX_MAKE_FLAGS = \
  	HOSTCC="$(HOSTCC)" \
  	HOSTCFLAGS="$(HOSTCFLAGS)" \
  	ARCH=$(KERNEL_ARCH) \
  	INSTALL_MOD_PATH=$(TARGET_DIR) \
  	CROSS_COMPILE="$(TARGET_CROSS)" \
  	DEPMOD=$(HOST_DIR)/sbin/depmod
  
  LINUX_MAKE_ENV = \
  	$(TARGET_MAKE_ENV) \
  	BR_BINARIES_DIR=$(BINARIES_DIR)
  
  # Get the real Linux version, which tells us where kernel modules are
  # going to be installed in the target filesystem.
  LINUX_VERSION_PROBED = `$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
  
  ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
  KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
  else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
  # We keep only the .dts files, so that the user can specify both .dts
  # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
  # copied to arch/<arch>/boot/dts, but only the .dts files will
  # actually be generated as .dtb.
  KERNEL_DTS_NAME = $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
  endif
  
  KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
  
  ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
  LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  ifeq ($(LINUX_IMAGE_NAME),)
  LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
  endif
  else
  ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
  LINUX_IMAGE_NAME = uImage
  else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  LINUX_IMAGE_NAME = uImage
  else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
  LINUX_IMAGE_NAME = bzImage
  else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
  LINUX_IMAGE_NAME = zImage
  else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
  LINUX_IMAGE_NAME = zImage.epapr
  else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
  LINUX_IMAGE_NAME = zImage
  else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
  LINUX_IMAGE_NAME = cuImage.$(KERNEL_DTS_NAME)
  else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
  LINUX_IMAGE_NAME = simpleImage.$(KERNEL_DTS_NAME)
  else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
  LINUX_IMAGE_NAME = Image
  else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
  LINUX_IMAGE_NAME = linux.bin
  else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
  LINUX_IMAGE_NAME = vmlinux.bin
  else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  LINUX_IMAGE_NAME = vmlinux
  else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  LINUX_IMAGE_NAME = vmlinuz
  else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  LINUX_IMAGE_NAME = vmlinuz.bin
  endif
  # The if-else blocks above are all the image types we know of, and all
  # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
  # to something
  LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
  endif
  
  LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
  ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
  LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
  endif
  
  # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
  # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
  # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
  # defconfig file.
  ifeq ($(KERNEL_ARCH),i386)
  KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
  else ifeq ($(KERNEL_ARCH),x86_64)
  KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
  else
  KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
  endif
  
  ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  else
  LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
  endif # BR2_LINUX_KERNEL_VMLINUX
  
  define LINUX_APPLY_LOCAL_PATCHES
  	for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
  		if test -d $$p ; then \
  			$(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
  		else \
  			$(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
  		fi \
  	done
  endef
  
  LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
  
  # Older linux kernels use deprecated perl constructs in timeconst.pl
  # that were removed for perl 5.22+ so it breaks on newer distributions
  # Try a dry-run patch to see if this applies, if it does go ahead
  define LINUX_TRY_PATCH_TIMECONST
  	@if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
  		$(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
  	fi
  endef
  LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
  
  ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
  else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
  LINUX_KCONFIG_DEFCONFIG = defconfig
  else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
  endif
  LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
  LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
  LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
  
  # If no package has yet set it, set it from the Kconfig option
  LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
  
  # Make sure the Linux kernel is built with the right endianness. Not
  # all architectures support
  # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
  # option will be thrown away and ignored if it doesn't exist.
  ifeq ($(BR2_ENDIAN),"BIG")
  define LINUX_FIXUP_CONFIG_ENDIANNESS
  	$(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN,$(@D)/.config)
  endef
  else
  define LINUX_FIXUP_CONFIG_ENDIANNESS
  	$(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN,$(@D)/.config)
  endef
  endif
  
  define LINUX_KCONFIG_FIXUP_CMDS
  	$(if $(LINUX_NEEDS_MODULES),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_MODULES,$(@D)/.config))
  	$(call KCONFIG_ENABLE_OPT,$(LINUX_COMPRESSION_OPT_y),$(@D)/.config)
  	$(foreach opt, $(LINUX_COMPRESSION_OPT_),
  		$(call KCONFIG_DISABLE_OPT,$(opt),$(@D)/.config)
  	)
  	$(LINUX_FIXUP_CONFIG_ENDIANNESS)
  	$(if $(BR2_arm)$(BR2_armeb),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
  	$(if $(BR2_TARGET_ROOTFS_CPIO),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
  	# As the kernel gets compiled before root filesystems are
  	# built, we create a fake cpio file. It'll be
  	# replaced later by the real cpio archive, and the kernel will be
  	# rebuilt using the linux-rebuild-with-initramfs target.
  	$(if $(BR2_TARGET_ROOTFS_INITRAMFS),
  		touch $(BINARIES_DIR)/rootfs.cpio
  		$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
  		$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
  		$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
  	$(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
  		$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
  	$(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
  	$(if $(BR2_PACKAGE_KTAP),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
  	$(if $(BR2_PACKAGE_SYSTEMD),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_XATTR,$(@D)/.config))
  	$(if $(BR2_PACKAGE_SMACK),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
  	$(if $(BR2_PACKAGE_IPTABLES),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
  	$(if $(BR2_PACKAGE_XTABLES_ADDONS),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_ADVANCED,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
  		$(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
  	$(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
  		$(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
  	$(if $(BR2_PACKAGE_KERNEL_MODULE_IMX_GPU_VIV),
  		$(call KCONFIG_DISABLE_OPT,CONFIG_MXC_GPU_VIV,$(@D)/.config))
  endef
  
  ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
  ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
  define LINUX_BUILD_DTB
  	$(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
  endef
  ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
  define LINUX_INSTALL_DTB
  	# dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
  	cp $(addprefix \
  		$(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
  		$(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
  		$(1)
  endef
  endif # BR2_LINUX_KERNEL_APPENDED_DTB
  endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
  endif # BR2_LINUX_KERNEL_DTS_SUPPORT
  
  ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
  define LINUX_APPEND_DTB
  	(cd $(KERNEL_ARCH_PATH)/boot; \
  		for dtb in $(KERNEL_DTS_NAME); do \
  			if test -e $${dtb}.dtb ; then \
  				dtbpath=$${dtb}.dtb ; \
  			else \
  				dtbpath=dts/$${dtb}.dtb ; \
  			fi ; \
  			cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
  		done)
  endef
  ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  # We need to generate a new u-boot image that takes into
  # account the extra-size added by the device tree at the end
  # of the image. To do so, we first need to retrieve both load
  # address and entry point for the kernel from the already
  # generate uboot image before using mkimage -l.
  LINUX_APPEND_DTB += ; \
  	MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
  	sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
  	for dtb in $(KERNEL_DTS_NAME); do \
  		$(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
  			-T kernel -C none $${MKIMAGE_ARGS} \
  			-d $(KERNEL_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
  	done
  endif
  endif
  
  # Compilation. We make sure the kernel gets rebuilt when the
  # configuration has changed.
  define LINUX_BUILD_CMDS
  	$(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
  		cp -f $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) $(KERNEL_ARCH_PATH)/boot/dts/)
  	$(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
  	@if grep -q "CONFIG_MODULES=y" $(@D)/.config; then 	\
  		$(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;	\
  	fi
  	$(LINUX_BUILD_DTB)
  	$(LINUX_APPEND_DTB)
  endef
  
  ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  # When a DTB was appended, install the potential several images with
  # appended DTBs.
  define LINUX_INSTALL_IMAGE
  	mkdir -p $(1)
  	cp $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
  endef
  else
  # Otherwise, just install the unique image generated by the kernel
  # build process.
  define LINUX_INSTALL_IMAGE
  	$(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(LINUX_IMAGE_NAME)
  endef
  endif
  
  ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
  define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
  	$(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
  	$(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
  endef
  endif
  
  define LINUX_INSTALL_HOST_TOOLS
  	# Installing dtc (device tree compiler) as host tool, if selected
  	if grep -q "CONFIG_DTC=y" $(@D)/.config; then 	\
  		$(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/linux-dtc ;	\
  		if [ ! -e $(HOST_DIR)/usr/bin/dtc ]; then	\
  			ln -sf linux-dtc $(HOST_DIR)/usr/bin/dtc ;	\
  		fi	\
  	fi
  endef
  
  
  define LINUX_INSTALL_IMAGES_CMDS
  	$(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  	$(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
  endef
  
  define LINUX_INSTALL_TARGET_CMDS
  	$(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
  	# Install modules and remove symbolic links pointing to build
  	# directories, not relevant on the target
  	@if grep -q "CONFIG_MODULES=y" $(@D)/.config; then 	\
  		$(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
  		rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;		\
  		rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;	\
  	fi
  	$(LINUX_INSTALL_HOST_TOOLS)
  endef
  
  # Include all our extensions and tools definitions.
  #
  # Note: our package infrastructure uses the full-path of the last-scanned
  # Makefile to determine what package we're currently defining, using the
  # last directory component in the path. As such, including other Makefile,
  # like below, before we call one of the *-package macro is usally not
  # working.
  # However, since the files we include here are in the same directory as
  # the current Makefile, we are OK. But this is a hard requirement: files
  # included here *must* be in the same directory!
  include $(sort $(wildcard linux/linux-ext-*.mk))
  include $(sort $(wildcard linux/linux-tool-*.mk))
  
  LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
  	$(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
  
  LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
  	$(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
  		$(call UPPERCASE,$(ext))_PREPARE_KERNEL))
  
  # Install Linux kernel tools in the staging directory since some tools
  # may install shared libraries and headers (e.g. cpupower). The kernel
  # image is NOT installed in the staging directory.
  LINUX_INSTALL_STAGING = YES
  
  LINUX_DEPENDENCIES += $(foreach tool,$(LINUX_TOOLS),\
  	$(if $(BR2_LINUX_KERNEL_TOOL_$(call UPPERCASE,$(tool))),\
  		$($(call UPPERCASE,$(tool))_DEPENDENCIES)))
  
  LINUX_POST_BUILD_HOOKS += $(foreach tool,$(LINUX_TOOLS),\
  	$(if $(BR2_LINUX_KERNEL_TOOL_$(call UPPERCASE,$(tool))),\
  		$(call UPPERCASE,$(tool))_BUILD_CMDS))
  
  LINUX_POST_INSTALL_STAGING_HOOKS += $(foreach tool,$(LINUX_TOOLS),\
  	$(if $(BR2_LINUX_KERNEL_TOOL_$(call UPPERCASE,$(tool))),\
  		$(call UPPERCASE,$(tool))_INSTALL_STAGING_CMDS))
  
  LINUX_POST_INSTALL_TARGET_HOOKS += $(foreach tool,$(LINUX_TOOLS),\
  	$(if $(BR2_LINUX_KERNEL_TOOL_$(call UPPERCASE,$(tool))),\
  		$(call UPPERCASE,$(tool))_INSTALL_TARGET_CMDS))
  
  # Checks to give errors that the user can understand
  ifeq ($(BR_BUILDING),y)
  
  ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  # We must use the user-supplied kconfig value, because
  # LINUX_KCONFIG_DEFCONFIG will at least contain the
  # trailing _defconfig
  ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
  $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
  endif
  endif
  
  ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  ifeq ($(LINUX_KCONFIG_FILE),)
  $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
  endif
  endif
  
  ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT)$(KERNEL_DTS_NAME),y)
  $(error No kernel device tree source specified, check your \
  BR2_LINUX_KERNEL_USE_INTREE_DTS / BR2_LINUX_KERNEL_USE_CUSTOM_DTS settings)
  endif
  
  endif # BR_BUILDING
  
  $(eval $(kconfig-package))
  
  # Support for rebuilding the kernel after the cpio archive has
  # been generated in $(BINARIES_DIR)/rootfs.cpio.
  $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
  	@$(call MESSAGE,"Rebuilding kernel with initramfs")
  	# Build the kernel.
  	$(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
  	$(LINUX_APPEND_DTB)
  	# Copy the kernel image(s) to its(their) final destination
  	$(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  	# If there is a .ub file copy it to the final destination
  	test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
  	$(Q)touch $@
  
  # The initramfs building code must make sure this target gets called
  # after it generated the initramfs list of files.
  linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt