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

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Message-ID: <87d4umqesn.fsf@duaron.myhome.or.jp>
Date:	Thu, 08 Nov 2007 00:02:48 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Olof Johansson <olof@...om.net>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] fat: silence warning for 64KB PAGE_SIZE builds

Olof Johansson <olof@...om.net> writes:

> 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);

Acked-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>

Thanks a lot.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
-
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