--- a/include/asm-generic/mman.h	2010-01-21 17:27:09.000000000 +0200
+++ a/include/asm-generic/mman.h	2010-01-21 17:31:14.000000000 +0200
@@ -34,6 +34,8 @@ 
 #define MADV_REMOVE	9		/* remove these pages & resources */
 #define MADV_DONTFORK	10		/* don't inherit across fork */
 #define MADV_DOFORK	11		/* do inherit across fork */
+#define MADV_MERGEABLE	12		/* KSM may merge identical pages */
+#define MADV_UNMERGEABLE 13		/* KSM may not merge identical pages */
 
 /* compatibility flags */
 #define MAP_FILE	0