[openwrt/openwrt] kernel: fix build error for external kernel.

[LEDE Commits]

blogic pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/441c26da6ad92b0d4529e1844736c55a31bfd45c

commit 441c26da6ad92b0d4529e1844736c55a31bfd45c
Author: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun at microchip.com>
AuthorDate: Fri May 4 10:27:46 2018 -0700

    kernel: fix build error for external kernel.
    
    fixed build error when external kernel is selected from menuconfig.
    The patches present in target/linux/generic does not gets applied
    to external kernel and build fails while compiling mac82011 &
    regmap-core kernel modules. as a fix added check in Makefile for
    CONFIG_EXTERNAL_KERNEL_TREE present or not.
    
    Signed-off-by: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun at microchip.com>
---
 package/kernel/linux/modules/other.mk |  6 +++++-
 package/kernel/mac80211/Makefile      | 15 ++++++++++-----
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/package/kernel/linux/modules/other.mk b/package/kernel/linux/modules/other.mk
index 4aee820..11f28f4 100644
--- a/package/kernel/linux/modules/other.mk
+++ b/package/kernel/linux/modules/other.mk
@@ -707,11 +707,15 @@ define KernelPackage/regmap
 	   CONFIG_REGMAP_I2C \
 	   CONFIG_SPI=y
   FILES:= \
-	$(LINUX_DIR)/drivers/base/regmap/regmap-core.ko \
 	$(LINUX_DIR)/drivers/base/regmap/regmap-i2c.ko \
 	$(LINUX_DIR)/drivers/base/regmap/regmap-mmio.ko \
 	$(if $(CONFIG_SPI),$(LINUX_DIR)/drivers/base/regmap/regmap-spi.ko)
   AUTOLOAD:=$(call AutoLoad,21,regmap-core regmap-i2c regmap-mmio regmap-spi)
+  ifeq ($(strip $(CONFIG_EXTERNAL_KERNEL_TREE)),"")
+   ifeq ($(strip $(CONFIG_KERNEL_GIT_CLONE_URI)),"")
+    FILES += $(LINUX_DIR)/drivers/base/regmap/regmap-core.ko
+   endif
+  endif
 endef
 
 define KernelPackage/regmap/description
diff --git a/package/kernel/mac80211/Makefile b/package/kernel/mac80211/Makefile
index f3e4d79..dc198eb 100644
--- a/package/kernel/mac80211/Makefile
+++ b/package/kernel/mac80211/Makefile
@@ -1797,11 +1797,16 @@ ifneq ($(CONFIG_PACKAGE_kmod-cfg80211)$(CONFIG_PACKAGE_kmod-lib80211),)
  endef
 endif
 
-define Build/Configure
-	cmp $(PKG_BUILD_DIR)/include/linux/ath9k_platform.h $(LINUX_DIR)/include/linux/ath9k_platform.h
-	cmp $(PKG_BUILD_DIR)/include/linux/ath5k_platform.h $(LINUX_DIR)/include/linux/ath5k_platform.h
-	cmp $(PKG_BUILD_DIR)/include/linux/rt2x00_platform.h $(LINUX_DIR)/include/linux/rt2x00_platform.h
-endef
+#do not Build/Configure for EXTERNAL KERNEL
+ifeq ($(strip $(CONFIG_EXTERNAL_KERNEL_TREE)),"")
+  ifeq ($(strip $(CONFIG_KERNEL_GIT_CLONE_URI)),"")
+    define Build/Configure
+	  cmp $(PKG_BUILD_DIR)/include/linux/ath9k_platform.h $(LINUX_DIR)/include/linux/ath9k_platform.h
+	  cmp $(PKG_BUILD_DIR)/include/linux/ath5k_platform.h $(LINUX_DIR)/include/linux/ath5k_platform.h
+	  cmp $(PKG_BUILD_DIR)/include/linux/rt2x00_platform.h $(LINUX_DIR)/include/linux/rt2x00_platform.h
+    endef
+  endif
+endif
 
 define Build/Compile
 	$(SH_FUNC) var2file "$(call shvar,mac80211_config)" $(PKG_BUILD_DIR)/.config