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Commit 1368c4f2 authored by Vignesh Babu BM's avatar Vignesh Babu BM Committed by Linus Torvalds
Browse files

is_power_of_2 in fs/block_dev.c 



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

Signed-off-by: default avatarvignesh babu <vignesh.babu@wipro.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e1b5c1d3

fs/block_dev.c

+2 −1
Original line number Diff line number Diff line
@@ -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 */