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is_power_of_2 in fs/block_dev.c

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Replace (n & (n-1)) in the context of power of 2 checks with is_power_of_2

Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vignesh Babu BM 2007-05-08 00:24:32 -07:00 committed by Linus Torvalds
parent e1b5c1d3da
commit 1368c4f248
1 changed files with 2 additions and 1 deletions
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3
fs/block_dev.c
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@ -22,6 +22,7 @@
#include <linux/mount.h>
#include <linux/uio.h>
#include <linux/namei.h>
#include <linux/log2.h>
#include <asm/uaccess.h>
#include "internal.h"
@ -67,7 +68,7 @@ static void kill_bdev(struct block_device *bdev)
int set_blocksize(struct block_device *bdev, int size)
{
/* Size must be a power of two, and between 512 and PAGE_SIZE */
if (size > PAGE_SIZE || size < 512 || (size & (size-1)))
if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size))
return -EINVAL;
/* Size cannot be smaller than the size supported by the device */