linux-kernel - Re: [PATCH v2 3/3] mm/hwpoison: fix return value of madvise

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Message-ID: <1377574096-y8hxgzdw-mutt-n-horiguchi@ah.jp.nec.com>
Date:	Mon, 26 Aug 2013 23:28:16 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Tony Luck <tony.luck@...el.com>, gong.chen@...ux.intel.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] mm/hwpoison: fix return value of madvise_hwpoison

On Tue, Aug 27, 2013 at 10:39:31AM +0800, Wanpeng Li wrote:
> The return value outside for loop is always zero which means madvise_hwpoison 
> return success, however, this is not truth for soft_offline_page w/ failure
> return value.

I don't understand what you want to do for what reason. Could you clarify
those?

> 
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
> ---
>  mm/madvise.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/madvise.c b/mm/madvise.c
> index a20764c..19b71e4 100644
> --- a/mm/madvise.c
> +++ b/mm/madvise.c
> @@ -359,7 +359,7 @@ static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
>  				page_to_pfn(p), start);
>  			ret = soft_offline_page(p, MF_COUNT_INCREASED);
>  			if (ret)
> -				break;
> +				return ret;
>  			continue;
>  		}
>  		pr_info("Injecting memory failure for page %#lx at %#lx\n",

This seems to introduce no behavioral change.

Thanks,
Naoya Horiguchi
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