From: Wu Fengguang <fengguang.wu@intel.com>
Date: Thu, 8 Jan 2009 02:09:12 +0000 (-0800)
Subject: generic swap(): introduce global macro swap(a, b)
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=91f68b7359144aa40bb9668124543d15284750b4;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

generic swap(): introduce global macro swap(a, b)

There have been some local definitions of swap(), it's time to replace
them all with a uniform one.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 6b8e2027165e..343df9ef2412 100644
--- a/include/linux/kernel.h
+++ b/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.