linux-kernel - Re: [PATCH 3/6] mm, hwpoison: fix extra put_page() in soft_offline

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Message-ID: <20220819052146.GC613144@hori.linux.bs1.fc.nec.co.jp>
Date:   Fri, 19 Aug 2022 05:21:46 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Miaohe Lin <linmiaohe@...wei.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] mm, hwpoison: fix extra put_page() in
 soft_offline_page()

On Thu, Aug 18, 2022 at 09:00:13PM +0800, Miaohe Lin wrote:
> When hwpoison_filter() refuses to soft offline a page, the page refcnt
> incremented previously by MF_COUNT_INCREASED would have been consumed
> via get_hwpoison_page() if ret <= 0. So the put_ref_page() here will
> put the extra one. Remove it to fix the issue.
> 
> Fixes: 9113eaf331bf ("mm/memory-failure.c: add hwpoison_filter for soft offline")
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>

> ---
>  mm/memory-failure.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 0c5ad7505b99..7023c3d81273 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -2591,8 +2591,6 @@ int soft_offline_page(unsigned long pfn, int flags)
>  	if (hwpoison_filter(page)) {
>  		if (ret > 0)
>  			put_page(page);
> -		else
> -			put_ref_page(ref_page);
>  
>  		mutex_unlock(&mf_mutex);
>  		return -EOPNOTSUPP;
> -- 
> 2.23.0