The patch titled
Avoid divide in IS_ALIGN
has been added to the -mm tree. Its filename is
avoid-divide-in-is_align.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Avoid divide in IS_ALIGN
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kernel.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/kernel.h~avoid-divide-in-is_align include/linux/kernel.h
--- a/include/linux/kernel.h~avoid-divide-in-is_align
+++ a/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))
_
Patches currently in -mm which might be from herbert@xxxxxxxxxxxxxxxxxxx are
git-net.patch
git-cryptodev.patch
avoid-divide-in-is_align.patch
-
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