linux/linux.mk

   1 ################################################################################
   2 #
   3 # Linux kernel target
   4 #
   5 ################################################################################
   6
   7 LINUX_VERSION = $(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
   8 LINUX_LICENSE = GPLv2
   9 LINUX_LICENSE_FILES = COPYING
  10
  11 # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  12 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
  13 LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  14 LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
  15 LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  16 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_LOCAL),y)
  17 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH))
  18 LINUX_SITE_METHOD = local
  19 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  20 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  21 LINUX_SITE_METHOD = git
  22 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  23 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  24 LINUX_SITE_METHOD = hg
  25 else
  26 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  27 # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  28 # to use the $(word) function. We support versions such as 4.0, 3.1,
  29 # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  30 ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  31 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  32 else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
  33 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
  34 else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
  35 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
  36 endif
  37 # release candidates are in testing/ subdir
  38 ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  39 LINUX_SITE := $(LINUX_SITE)/testing/
  40 endif # -rc
  41 endif
  42
  43 LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  44
  45 LINUX_INSTALL_IMAGES = YES
  46 LINUX_DEPENDENCIES += host-kmod host-lzop
  47
  48 ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
  49         LINUX_DEPENDENCIES += host-uboot-tools
  50 endif
  51
  52 LINUX_MAKE_FLAGS = \
  53         HOSTCC="$(HOSTCC)" \
  54         HOSTCFLAGS="$(HOSTCFLAGS)" \
  55         ARCH=$(KERNEL_ARCH) \
  56         INSTALL_MOD_PATH=$(TARGET_DIR) \
  57         CROSS_COMPILE="$(CCACHE) $(TARGET_CROSS)" \
  58         DEPMOD=$(HOST_DIR)/sbin/depmod
  59
  60 LINUX_MAKE_ENV = \
  61         $(TARGET_MAKE_ENV) \
  62         BR_BINARIES_DIR=$(BINARIES_DIR)
  63
  64 # Get the real Linux version, which tells us where kernel modules are
  65 # going to be installed in the target filesystem.
  66 LINUX_VERSION_PROBED = $(shell $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease)
  67
  68 ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
  69 KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
  70 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
  71 # We keep only the .dts files, so that the user can specify both .dts
  72 # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
  73 # copied to arch/<arch>/boot/dts, but only the .dts files will
  74 # actually be generated as .dtb.
  75 KERNEL_DTS_NAME = $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
  76 endif
  77
  78 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT)$(KERNEL_DTS_NAME),y)
  79 $(error No kernel device tree source specified, check your \
  80 BR2_LINUX_KERNEL_USE_INTREE_DTS / BR2_LINUX_KERNEL_USE_CUSTOM_DTS settings)
  81 endif
  82
  83 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  84 ifneq ($(words $(KERNEL_DTS_NAME)),1)
  85 $(error Kernel with appended device tree needs exactly one DTS source. \
  86         Check BR2_LINUX_KERNEL_INTREE_DTS_NAME or BR2_LINUX_KERNEL_CUSTOM_DTS_PATH.)
  87 endif
  88 endif
  89
  90 KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
  91
  92 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  93 LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
  94 LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  95 ifeq ($(LINUX_IMAGE_NAME),)
  96 LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
  97 endif
  98 else
  99 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
 100 LINUX_IMAGE_NAME = uImage
 101 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 102 LINUX_IMAGE_NAME = uImage
 103 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
 104 LINUX_IMAGE_NAME = bzImage
 105 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
 106 LINUX_IMAGE_NAME = zImage
 107 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
 108 LINUX_IMAGE_NAME = zImage
 109 else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
 110 LINUX_IMAGE_NAME = cuImage.$(KERNEL_DTS_NAME)
 111 else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
 112 LINUX_IMAGE_NAME = simpleImage.$(KERNEL_DTS_NAME)
 113 else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
 114 LINUX_IMAGE_NAME = linux.bin
 115 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
 116 LINUX_IMAGE_NAME = vmlinux.bin
 117 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 118 LINUX_IMAGE_NAME = vmlinux
 119 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 120 LINUX_IMAGE_NAME = vmlinuz
 121 endif
 122 # The if-else blocks above are all the image types we know of, and all
 123 # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
 124 # to something
 125 LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
 126 endif
 127
 128 LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
 129 ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
 130 LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
 131 endif
 132
 133 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
 134 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
 135 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
 136 # defconfig file.
 137 ifeq ($(KERNEL_ARCH),i386)
 138 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 139 else ifeq ($(KERNEL_ARCH),x86_64)
 140 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 141 else
 142 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
 143 endif
 144
 145 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 146 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 147 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 148 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 149 else
 150 LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
 151 endif # BR2_LINUX_KERNEL_VMLINUX
 152
 153 define LINUX_DOWNLOAD_PATCHES
 154         $(if $(LINUX_PATCHES),
 155                 @$(call MESSAGE,"Download additional patches"))
 156         $(foreach patch,$(filter ftp://% http://% https://%,$(LINUX_PATCHES)),\
 157                 $(call DOWNLOAD_WGET,$(patch),$(notdir $(patch)))$(sep))
 158 endef
 159
 160 LINUX_POST_DOWNLOAD_HOOKS += LINUX_DOWNLOAD_PATCHES
 161
 162 define LINUX_APPLY_PATCHES
 163         for p in $(LINUX_PATCHES) ; do \
 164                 if echo $$p | grep -q -E "^ftp://|^http://|^https://" ; then \
 165                         $(APPLY_PATCHES) $(@D) $(DL_DIR) `basename $$p` ; \
 166                 elif test -d $$p ; then \
 167                         $(APPLY_PATCHES) $(@D) $$p linux-\*.patch ; \
 168                 else \
 169                         $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` ; \
 170                 fi \
 171         done
 172 endef
 173
 174 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_PATCHES
 175
 176
 177 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 178 KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 179 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 180 KERNEL_SOURCE_CONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
 181 endif
 182
 183 LINUX_KCONFIG_FILE = $(KERNEL_SOURCE_CONFIG)
 184 LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
 185 LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
 186
 187 define LINUX_KCONFIG_FIXUP_CMDS
 188         $(if $(BR2_arm)$(BR2_armeb),
 189                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
 190         $(if $(BR2_TARGET_ROOTFS_CPIO),
 191                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
 192         # As the kernel gets compiled before root filesystems are
 193         # built, we create a fake cpio file. It'll be
 194         # replaced later by the real cpio archive, and the kernel will be
 195         # rebuilt using the linux-rebuild-with-initramfs target.
 196         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
 197                 touch $(BINARIES_DIR)/rootfs.cpio
 198                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
 199                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
 200                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
 201         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
 202                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
 203                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 204         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
 205                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
 206         $(if $(BR2_PACKAGE_KTAP),
 207                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
 208                 $(call KCONFIG_ENABLE_OPT,CONFIG_EVENT_TRACING,$(@D)/.config)
 209                 $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
 210                 $(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
 211         $(if $(BR2_PACKAGE_SYSTEMD),
 212                 $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
 213                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
 214                 $(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
 215                 $(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
 216                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
 217                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_XATTR,$(@D)/.config))
 218         $(if $(BR2_PACKAGE_SMACK),
 219                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
 220                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
 221                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
 222         $(if $(BR2_PACKAGE_IPTABLES),
 223                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
 224                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
 225                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
 226                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
 227         $(if $(BR2_PACKAGE_XTABLES_ADDONS),
 228                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
 229                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
 230         $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
 231                 $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
 232 endef
 233
 234 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
 235 ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
 236 define LINUX_BUILD_DTB
 237         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
 238 endef
 239 define LINUX_INSTALL_DTB
 240         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
 241         cp $(addprefix \
 242                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
 243                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
 244                 $(BINARIES_DIR)/
 245 endef
 246 define LINUX_INSTALL_DTB_TARGET
 247         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
 248         cp $(addprefix \
 249                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
 250                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
 251                 $(TARGET_DIR)/boot/
 252 endef
 253 endif
 254 endif
 255
 256 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 257 # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
 258 define LINUX_APPEND_DTB
 259         if [ -e $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb ]; then \
 260                 cat $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb; \
 261         else \
 262                 cat $(KERNEL_ARCH_PATH)/boot/dts/$(KERNEL_DTS_NAME).dtb; \
 263         fi >> $(KERNEL_ARCH_PATH)/boot/zImage
 264 endef
 265 ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 266 # We need to generate a new u-boot image that takes into
 267 # account the extra-size added by the device tree at the end
 268 # of the image. To do so, we first need to retrieve both load
 269 # address and entry point for the kernel from the already
 270 # generate uboot image before using mkimage -l.
 271 LINUX_APPEND_DTB += $(sep) MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
 272         sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
 273         $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
 274         -T kernel -C none $${MKIMAGE_ARGS} \
 275         -d $(KERNEL_ARCH_PATH)/boot/zImage $(LINUX_IMAGE_PATH);
 276 endif
 277 endif
 278
 279 # Compilation. We make sure the kernel gets rebuilt when the
 280 # configuration has changed.
 281 define LINUX_BUILD_CMDS
 282         $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
 283                 cp $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) $(KERNEL_ARCH_PATH)/boot/dts/)
 284         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 285         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 286                 $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;        \
 287         fi
 288         $(LINUX_BUILD_DTB)
 289         $(LINUX_APPEND_DTB)
 290 endef
 291
 292
 293 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
 294 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
 295         install -m 0644 -D $(LINUX_IMAGE_PATH) $(TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
 296         $(LINUX_INSTALL_DTB_TARGET)
 297 endef
 298 endif
 299
 300
 301 define LINUX_INSTALL_HOST_TOOLS
 302         # Installing dtc (device tree compiler) as host tool, if selected
 303         if grep -q "CONFIG_DTC=y" $(@D)/.config; then   \
 304                 $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/dtc ;   \
 305         fi
 306 endef
 307
 308
 309 define LINUX_INSTALL_IMAGES_CMDS
 310         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 311         $(LINUX_INSTALL_DTB)
 312 endef
 313
 314 define LINUX_INSTALL_TARGET_CMDS
 315         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
 316         # Install modules and remove symbolic links pointing to build
 317         # directories, not relevant on the target
 318         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 319                 $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
 320                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;         \
 321                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;        \
 322         fi
 323         $(LINUX_INSTALL_HOST_TOOLS)
 324 endef
 325
 326 include $(sort $(wildcard linux/linux-ext-*.mk))
 327
 328 $(eval $(kconfig-package))
 329
 330 # Support for rebuilding the kernel after the cpio archive has
 331 # been generated in $(BINARIES_DIR)/rootfs.cpio.
 332 $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
 333         @$(call MESSAGE,"Rebuilding kernel with initramfs")
 334         # Build the kernel.
 335         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 336         $(LINUX_APPEND_DTB)
 337         # Copy the kernel image to its final destination
 338         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 339         # If there is a .ub file copy it to the final destination
 340         test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
 341         $(Q)touch $@
 342
 343 # The initramfs building code must make sure this target gets called
 344 # after it generated the initramfs list of files.
 345 linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt
 346
 347 # Checks to give errors that the user can understand
 348 ifeq ($(filter source,$(MAKECMDGOALS)),)
 349 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 350 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
 351 $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
 352 endif
 353 endif
 354
 355 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 356 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)),)
 357 $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
 358 endif
 359 endif
 360
 361 endif