kernel: fix kmod-gre for Kernel >= 2.6.37 (#9009)

SVN-Revision: 25985

package/kernel/modules/netsupport.mk

@@ -370,8 +370,10 @@ $(eval $(call KernelPackage,ip6-tunnel))
 define KernelPackage/gre
   SUBMENU:=$(NETWORK_SUPPORT_MENU)
   TITLE:=GRE support
-  KCONFIG:=CONFIG_NET_IPGRE
-  FILES=$(LINUX_DIR)/net/ipv4/ip_gre.ko
+  KCONFIG:=CONFIG_NET_IPGRE \
+    $(if $(strip $(call CompareKernelPatchVer,$(KERNEL_PATCHVER),le,2.6.37)),CONFIG_NET_IPGRE_DEMUX)
+  FILES=$(LINUX_DIR)/net/ipv4/ip_gre.ko \
+    $(if $(strip $(call CompareKernelPatchVer,$(KERNEL_PATCHVER),le,2.6.37)),$(LINUX_DIR)/net/ipv4/gre.ko)
 endef
 
 define KernelPackage/gre/description