diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 17aadb5ca5f748747f3a4d8747c83d29658fd420..f4860a9e8d0bc1dcd2b90d55e2dd19eff6243e3f 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1477,7 +1477,8 @@ static inline int sanitize_mpol_flags(int *mode, unsigned short *flags)
 	*flags = *mode & MPOL_MODE_FLAGS;
 	*mode &= ~MPOL_MODE_FLAGS;
 
-	if ((unsigned int)(*mode) >=  MPOL_MAX)
+	if ((unsigned int)(*mode) >=  MPOL_MAX ||
+	    (unsigned int)(*mode) == MPOL_WEIGHTED_INTERLEAVE)
 		return -EINVAL;
 	if ((*flags & MPOL_F_STATIC_NODES) && (*flags & MPOL_F_RELATIVE_NODES))
 		return -EINVAL;
@@ -2989,6 +2990,7 @@ static const char * const policy_modes[] =
 	[MPOL_PREFERRED]  = "prefer",
 	[MPOL_BIND]       = "bind",
 	[MPOL_INTERLEAVE] = "interleave",
+	[MPOL_WEIGHTED_INTERLEAVE] = "weighted interleave",
 	[MPOL_LOCAL]      = "local",
 	[MPOL_PREFERRED_MANY]  = "prefer (many)",
 };