Index: kernel/generic/include/mm/mm.h
===================================================================
--- kernel/generic/include/mm/mm.h	(revision 61eb2ce2769cc7e957b2ee93ca59919d895a7999)
+++ kernel/generic/include/mm/mm.h	(revision 3b6854248cddcb5c644dde7380ebb48393b90942)
@@ -46,4 +46,5 @@
 #define PAGE_EXEC_SHIFT			5
 #define PAGE_GLOBAL_SHIFT		6
+#define PAGE_WRITE_COMBINE_SHIFT  7
 
 #define PAGE_NOT_CACHEABLE		(0 << PAGE_CACHEABLE_SHIFT)
@@ -62,4 +63,6 @@
 #define PAGE_GLOBAL			(1 << PAGE_GLOBAL_SHIFT)
 
+#define PAGE_WRITE_COMBINE  (1 << PAGE_WRITE_COMBINE_SHIFT)
+
 #endif