diff --git a/[refs] b/[refs]
index 5b0da9cd597c..f71339c3bc02 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b53907c0100a353a7ac53bed260e735e5ccbbbcc
+refs/heads/master: 91f68b7359144aa40bb9668124543d15284750b4
diff --git a/trunk/include/linux/kernel.h b/trunk/include/linux/kernel.h
index 6b8e2027165e..343df9ef2412 100644
--- a/trunk/include/linux/kernel.h
+++ b/trunk/include/linux/kernel.h
@@ -476,6 +476,12 @@ static inline char *pack_hex_byte(char *buf, u8 byte)
 	__val = __val < __min ? __min: __val;	\
 	__val > __max ? __max: __val; })
 
+
+/*
+ * swap - swap value of @a and @b
+ */
+#define swap(a, b) ({ typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; })
+
 /**
  * container_of - cast a member of a structure out to the containing structure
  * @ptr:	the pointer to the member.