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| author | Peter Zijlstra <peterz@infradead.org> | 2009-02-04 15:11:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-02-05 12:56:46 -0800 |
| commit | ac7b9004909d03d67016368093e81d37cae72895 (patch) | |
| tree | 089cd0432d3c93b14dbd9d0178bfe2fa19690fd1 /include/linux/kernel.h | |
| parent | c073b2db006ba9370be1eecc36a1be1d9ce31310 (diff) | |
| download | lwn-ac7b9004909d03d67016368093e81d37cae72895.tar.gz lwn-ac7b9004909d03d67016368093e81d37cae72895.zip | |
generic swap(): don't return a value from swap()
The swap() macro is accidentally retuning the value of its first argument.
Change it into a doesn't-return-anything macro before someone goes and
relies upon this behaviour.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wu Fengguang <wfg@linux.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/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 343df9ef2412..7fa371898e3e 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -480,7 +480,8 @@ static inline char *pack_hex_byte(char *buf, u8 byte) /* * swap - swap value of @a and @b */ -#define swap(a, b) ({ typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; }) +#define swap(a, b) \ + do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0) /** * container_of - cast a member of a structure out to the containing structure |