linux-kernel - Re: [PATCH] memory-failure/hwpoison_user_mappings: move the comment about swap cache pages' check to proper location

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Date:	Tue, 4 Aug 2015 23:05:18 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Wang Xiaoqiang <wangxq10@....edu.cn>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] memory-failure/hwpoison_user_mappings: move the comment
 about swap cache pages' check to proper location

On Tue, Aug 04, 2015 at 08:20:38PM +0800, Wang Xiaoqiang wrote:
> Hi Naoya,
> 
> This patch just move the comment about swap cache pages' check to the
> proper location in 'hwpoison_user_mappings' function.
> 
> Signed-off-by: Wang Xiaoqiang <wangxq10@....edu.cn>

Thank you for finding out this.

Acked-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

> ---
>  mm/memory-failure.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 1cf7f29..3253abb 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -945,10 +945,6 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
>  	if (!(PageLRU(hpage) || PageHuge(p)))
>  		return SWAP_SUCCESS;
>  
> -	/*
> -	 * This check implies we don't kill processes if their pages
> -	 * are in the swap cache early. Those are always late kills.
> -	 */
>  	if (!page_mapped(hpage))
>  		return SWAP_SUCCESS;
>  
> @@ -957,6 +953,10 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
>  		return SWAP_FAIL;
>  	}
>  
> +	/*
> +	 * This check implies we don't kill processes if their pages
> +	 * are in the swap cache early. Those are always late kills.
> +	 */
>  	if (PageSwapCache(p)) {
>  		printk(KERN_ERR
>  		       "MCE %#lx: keeping poisoned page in swap cache\n", pfn);
> -- 
> 1.7.10.4
> 
> 
> 
> --
> thx!
> Wang Xiaoqiang
> 
> --
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