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authorWu Fengguang <fengguang.wu@intel.com>2009-01-07 18:09:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:15 -0800
commit91f68b7359144aa40bb9668124543d15284750b4 (patch)
tree69f11509a40655c17a44da9b61debdb31209f208 /include/linux
parentb53907c0100a353a7ac53bed260e735e5ccbbbcc (diff)
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/kernel.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 6b8e2027165..343df9ef241 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.