linux-ext4 - Re: [patch] ext4: signedness bug breaks ext4_inode_touch_time

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Message-ID: <20130620152158.GA20615@gmail.com>
Date:	Thu, 20 Jun 2013 23:21:58 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Theodore Ts'o <tytso@....edu>, Zheng Liu <wenqing.lz@...bao.com>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] ext4: signedness bug breaks ext4_inode_touch_time_cmp()

On Thu, Jun 20, 2013 at 11:08:58AM +0300, Dan Carpenter wrote:
> "diff" is unsigned so this doesn't sort the LRU list correctly.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Thanks for fixing it.

Regards,
                                                - Zheng

> ---
> This was introduced in 6480bad916be "ext4: improve extent cache shrink
> mechanism to avoid to burn CPU time"
> 
> diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
> index e0190f6..79e097d 100644
> --- a/fs/ext4/extents_status.c
> +++ b/fs/ext4/extents_status.c
> @@ -880,7 +880,7 @@ static int ext4_inode_touch_time_cmp(void *priv, struct list_head *a,
>  				     struct list_head *b)
>  {
>  	struct ext4_inode_info *eia, *eib;
> -	unsigned long diff;
> +	long diff;
>  
>  	eia = list_entry(a, struct ext4_inode_info, i_es_lru);
>  	eib = list_entry(b, struct ext4_inode_info, i_es_lru);
> --
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