diff --git a/[refs] b/[refs]
index a471f7f92b23..edb9546835df 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 45c4745af381851b0406d8e4db99e62e265691c2
+refs/heads/master: aab0b1029f0843756b68e0ed3ca983685bf43ed6
diff --git a/trunk/include/linux/mempolicy.h b/trunk/include/linux/mempolicy.h
index 9080fab1426d..017def89e568 100644
--- a/trunk/include/linux/mempolicy.h
+++ b/trunk/include/linux/mempolicy.h
@@ -44,6 +44,13 @@ enum {
 #define MPOL_MF_MOVE_ALL (1<<2)	/* Move every page to conform to mapping */
 #define MPOL_MF_INTERNAL (1<<3)	/* Internal flags start here */
 
+/*
+ * Internal flags that share the struct mempolicy flags word with
+ * "mode flags".  These flags are allocated from bit 0 up, as they
+ * are never OR'ed into the mode in mempolicy API arguments.
+ */
+#define MPOL_F_SHARED  (1 << 0)	/* identify shared policies */
+
 #ifdef __KERNEL__
 
 #include <linux/mmzone.h>
diff --git a/trunk/mm/mempolicy.c b/trunk/mm/mempolicy.c
index 5e7eea2dc8b4..78b18a60b9b2 100644
--- a/trunk/mm/mempolicy.c
+++ b/trunk/mm/mempolicy.c
@@ -1750,6 +1750,7 @@ static struct sp_node *sp_alloc(unsigned long start, unsigned long end,
 	n->start = start;
 	n->end = end;
 	mpol_get(pol);
+	pol->flags |= MPOL_F_SHARED;	/* for unref */
 	n->policy = pol;
 	return n;
 }