Index: kernel/generic/include/mm/mm.h
===================================================================
--- kernel/generic/include/mm/mm.h	(revision 71307541fd5ee1f557ff938fd3f52195abde393b)
+++ kernel/generic/include/mm/mm.h	(revision 88e188b212ed9d3a1be0681ea4541e6258a70998)
@@ -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