linux-kernel - Re: [PATCH] fat: silence warning for 64KB PAGE

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Date:	Wed, 7 Nov 2007 09:01:20 -0600
From:	Olof Johansson <olof@...om.net>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fat: silence warning for 64KB PAGE_SIZE builds

Annoying gcc warning:

fs/fat/inode.c: In function 'fat_fill_super':
fs/fat/inode.c:1222: warning: comparison is always false due to limited range of data type

Change it to compare with 4K instead of PAGE_CACHE_SIZE, as suggested
by OGAWA-san.


Signed-off-by: Olof Johansson <olof@...om.net>

---

On Wed, Nov 07, 2007 at 11:39:01PM +0900, OGAWA Hirofumi wrote:
> Olof Johansson <olof@...om.net> writes:
> 
> > logical_sector_size can never be more than 16 bits worth, but switching
> > it to an int silences gcc. It's a sanity check that can never fail with
> > 64KB PAGE_SIZE but it seems like it'd still be useful for other page
> > sizes, so it's worth keeping:
[...]
> 
> Please use 4096 instead of allowing it, at least for now.

Sure. New patch.


Thanks,

-Olof

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 920a576..61e2874 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1219,7 +1219,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
 		le16_to_cpu(get_unaligned((__le16 *)&b->sector_size));
 	if (!is_power_of_2(logical_sector_size)
 	    || (logical_sector_size < 512)
-	    || (PAGE_CACHE_SIZE < logical_sector_size)) {
+	    || (logical_sector_size > 4096)) {
 		if (!silent)
 			printk(KERN_ERR "FAT: bogus logical sector size %u\n",
 			       logical_sector_size);
-
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