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authorVignesh Babu BM <vignesh.babu@wipro.com>2007-05-08 00:24:27 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:14:59 -0700
commite7d709c096487078652a1384d7a2d0e4459e18b6 (patch)
treefff2b8ecac3e9611182e83a21e95130d1cba308a
parent4fa156ea846daae44d60b05ea066d0e28fd3b6c4 (diff)
downloadconfigs-e7d709c096487078652a1384d7a2d0e4459e18b6.tar.gz
is_power_of_2 in fat
Replacing (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> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/fat/inode.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 65cb54bde48..a8129e82d59 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -25,6 +25,7 @@
#include <linux/parser.h>
#include <linux/uio.h>
#include <linux/writeback.h>
+#include <linux/log2.h>
#include <asm/unaligned.h>
#ifndef CONFIG_FAT_DEFAULT_IOCHARSET
@@ -1217,8 +1218,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
}
logical_sector_size =
le16_to_cpu(get_unaligned((__le16 *)&b->sector_size));
- if (!logical_sector_size
- || (logical_sector_size & (logical_sector_size - 1))
+ if (!is_power_of_2(logical_sector_size)
|| (logical_sector_size < 512)
|| (PAGE_CACHE_SIZE < logical_sector_size)) {
if (!silent)
@@ -1228,8 +1228,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
goto out_invalid;
}
sbi->sec_per_clus = b->sec_per_clus;
- if (!sbi->sec_per_clus
- || (sbi->sec_per_clus & (sbi->sec_per_clus - 1))) {
+ if (!is_power_of_2(sbi->sec_per_clus)) {
if (!silent)
printk(KERN_ERR "FAT: bogus sectors per cluster %u\n",
sbi->sec_per_clus);