Hi:
[KERNEL]: 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 <[email protected]>
Cheers,
--
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Email: Herbert Xu ~{PmV>HI~} <[email protected]>
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--
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 94bc996..39b3fa6 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))
-
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