From: Vignesh Babu BM <vignesh.babu@wipro.com>
To: Kernel Janitors List <kernel-janitors@lists.osdl.org>
Cc: hirofumi@mail.parknet.co.jp, linux-kernel@vger.kernel.org
Subject: [KJ][PATCH] is_power_of_2 in fat
Date: Tue, 20 Feb 2007 13:19:54 +0530 [thread overview]
Message-ID: <1171957794.6127.65.camel@wriver-t81fb058.linuxcoe> (raw)
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>
---
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index a9e4688..8437190 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
@@ -1216,8 +1217,7 @@ 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)
@@ -1227,8 +1227,7 @@ 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);
--
Regards,
Vignesh Babu BM
_____________________________________________________________
"Why is it that every time I'm with you, makes me believe in magic?"
next reply other threads:[~2007-02-20 7:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-20 7:49 Vignesh Babu BM [this message]
2007-02-20 13:12 ` OGAWA Hirofumi
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