Messages in this thread Patch in this message | | | Subject | generic swap() | From | Peter Zijlstra <> | Date | Fri, 16 Jan 2009 10:26:34 +0100 |
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Hi,
Where did this patch come from? -- I can't seem to find it on lkml at all..
The reason I ask it that I wonder why swap() has a return value?
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commit 91f68b7359144aa40bb9668124543d15284750b4 Author: Wu Fengguang <fengguang.wu@intel.com> Date: Wed Jan 7 18:09:12 2009 -0800
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 6b8e202..343df9e 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.
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