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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2008-02-06 01:37:05 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 10:41:04 -0800 |
| commit | f10db6277dfd6dffb80b2182a256d35adb3134bc (patch) | |
| tree | a86607ebc3567c2e4098907f986466e07a74f268 /include/linux/kernel.h | |
| parent | b0940003f25dd3d2c54c4879809a432a35197f54 (diff) | |
| download | lwn-f10db6277dfd6dffb80b2182a256d35adb3134bc.tar.gz lwn-f10db6277dfd6dffb80b2182a256d35adb3134bc.zip | |
Avoid divide in IS_ALIGN
I was happy to discover the brand new IS_ALIGN macro and quickly used it in
my code. To my dismay I found that the generated code used division to
perform the test.
This patch fixes it by changing the % test to an &. This avoids the
division.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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 | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index ff356b2ee478..18222f267bc4 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -35,7 +35,7 @@ extern const char linux_proc_banner[]; #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) -#define IS_ALIGNED(x,a) (((x) % ((typeof(x))(a))) == 0) +#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |