diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index bd92431..4ada3be 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2562,7 +2562,7 @@ int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, int no_context)
 		break;
 
 	default:
-		BUG();
+		return -EINVAL;
 	}
 
 	l = strlen(policy_modes[mode]);