include: calculate md5sum over sorted kernel config symbol list and incorperate it into the kernel metapackage version, make kmods depend on this specific version.

The aim of this change is to invalidate kmods which are built against a different kernel config on the opkg metadata level. Manual copying and insmod of custom 
*.ko files, e.g. for development purpose, is still possible.


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29686 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/kernel-defaults.mk

@@ -89,6 +89,7 @@ define Kernel/Configure/Default
 	$(call Kernel/SetInitramfs)
 	-$(_SINGLE)$(MAKE) $(KERNEL_MAKEOPTS) oldconfig prepare scripts
 	rm -rf $(KERNEL_BUILD_DIR)/modules
+	$(SH_FUNC) grep '=[ym]' $(LINUX_DIR)/.config | LC_ALL=C sort | md5s > $(LINUX_DIR)/.vermagic
 endef
 
 define Kernel/CompileModules/Default

include/kernel.mk

@@ -13,6 +13,7 @@ ifeq ($(DUMP),1)
   KERNEL?=<KERNEL>
   BOARD?=<BOARD>
   LINUX_VERSION?=<LINUX_VERSION>
+  LINUX_VERMAGIC?=<LINUX_VERMAGIC>
 else
   ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
     export GCC_HONOUR_COPTS=s
@@ -35,6 +36,9 @@ else
   KERNEL_BUILD_DIR ?= $(BUILD_DIR_BASE)/linux-$(BOARD)$(if $(SUBTARGET),_$(SUBTARGET))$(if $(BUILD_SUFFIX),_$(BUILD_SUFFIX))
   LINUX_DIR ?= $(KERNEL_BUILD_DIR)/linux-$(LINUX_VERSION)
 
+  LINUX_VERMAGIC:=$(strip $(shell cat $(LINUX_DIR)/.vermagic 2>/dev/null))
+  LINUX_VERMAGIC:=$(if $(LINUX_VERMAGIC),$(LINUX_VERMAGIC),unknown)
+
   LINUX_UNAME_VERSION:=$(if $(word 3,$(subst ., ,$(KERNEL_BASE))),$(KERNEL_BASE),$(KERNEL_BASE).0)
   ifneq ($(findstring -rc,$(LINUX_VERSION)),)
     LINUX_UNAME_VERSION:=$(LINUX_UNAME_VERSION)-$(strip $(lastword $(subst -, ,$(LINUX_VERSION))))
@@ -130,7 +134,7 @@ define KernelPackage
     SECTION:=kernel
     CATEGORY:=Kernel modules
     DESCRIPTION:=$(DESCRIPTION)
-    EXTRA_DEPENDS:=kernel (=$(LINUX_VERSION)-$(LINUX_RELEASE))
+    EXTRA_DEPENDS:=kernel (=$(LINUX_VERSION)-$(LINUX_RELEASE)-$(LINUX_VERMAGIC))
     VERSION:=$(LINUX_VERSION)$(if $(PKG_VERSION),+$(PKG_VERSION))-$(if $(PKG_RELEASE),$(PKG_RELEASE),$(LINUX_RELEASE))
     $(call KernelPackage/$(1))
     $(call KernelPackage/$(1)/$(BOARD))

package/kernel/Makefile

@@ -35,7 +35,7 @@ define Package/kernel
   CATEGORY:=Kernel
   DEFAULT:=y
   TITLE:=Virtual kernel package
-  VERSION:=$(LINUX_VERSION)-$(LINUX_RELEASE)
+  VERSION:=$(LINUX_VERSION)-$(LINUX_RELEASE)-$(LINUX_VERMAGIC)
   URL:=http://www.kernel.org/
 endef