[PATCH] Add SMP barrier to ipc's grow_ary()

From Dipanker Sarma.

Before setting the ids->entries to the new array, there must be a wmb()
to make sure that the memcpyed contents of the new array are visible
before the new array becomes visible.

ipc/util.c

@@ -132,6 +132,12 @@ static int grow_ary(struct ipc_ids* ids, int newsize)
 	old = ids->entries;
 	i = ids->size;
 
+	/*
+	 * before setting the ids->entries to the new array, there must be a
+	 * wmb() to make sure that the memcpyed contents of the new array are
+	 * visible before the new array becomes visible.
+	 */
+	wmb();
 	ids->entries = new;
 	wmb();
 	ids->size = newsize;