1 files changed, 10 insertions, 3 deletions

diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h
index 472de8a5d37e..6a1baae3775d 100644
--- a/include/uapi/linux/mempolicy.h
+++ b/include/uapi/linux/mempolicy.h
@@ -49,9 +49,16 @@ enum mpol_rebind_step {
 
 /* Flags for mbind */
 #define MPOL_MF_STRICT  (1<<0)  /* Verify existing pages in the mapping */
-#define MPOL_MF_MOVE    (1<<1)  /* Move pages owned by this process to conform to mapping */
-#define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to mapping */
-#define MPOL_MF_INTERNAL (1<<3) /* Internal flags start here */
+#define MPOL_MF_MOVE     (1<<1) /* Move pages owned by this process to conform
+                                   to policy */
+#define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to policy */
+#define MPOL_MF_LAZY     (1<<3) /* Modifies '_MOVE:  lazy migrate on fault */
+#define MPOL_MF_INTERNAL (1<<4) /* Internal flags start here */
+
+#define MPOL_MF_VALID   (MPOL_MF_STRICT   |     \
+                         MPOL_MF_MOVE     |     \
+                         MPOL_MF_MOVE_ALL |     \
+                         MPOL_MF_LAZY)
 
 /*
  * Internal flags that share the struct mempolicy flags word with