linux-kernel - Re: [PATCH 2/2] mm/damon/paddr: fix folio_nr_pages() after folio_put() in damon_pa_mark_accessed_or

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Date:   Mon, 6 Mar 2023 10:05:57 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     SeongJae Park <sj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     "Vishal Moola (Oracle)" <vishal.moola@...il.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        <damon@...ts.linux.dev>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH 2/2] mm/damon/paddr: fix folio_nr_pages() after
 folio_put() in damon_pa_mark_accessed_or_deactivate()



On 2023/3/5 3:39, SeongJae Park wrote:
> damon_pa_mark_accessed_or_deactivate() is accessing a folio via
> folio_nr_pages() after folio_put() for the folio has invoked.  Fix it.
> 

Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>

> Fixes: f70da5ee8fe1 ("mm/damon: convert damon_pa_mark_accessed_or_deactivate() to use folios")
> Cc: <stable@...r.kernel.org> # 6.3.x
> Signed-off-by: SeongJae Park <sj@...nel.org>
> ---
>   mm/damon/paddr.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
> index 10f159b315ea..0db724aec5cb 100644
> --- a/mm/damon/paddr.c
> +++ b/mm/damon/paddr.c
> @@ -277,8 +277,8 @@ static inline unsigned long damon_pa_mark_accessed_or_deactivate(
>   			folio_mark_accessed(folio);
>   		else
>   			folio_deactivate(folio);
> -		folio_put(folio);
>   		applied += folio_nr_pages(folio);
> +		folio_put(folio);
>   	}
>   	return applied * PAGE_SIZE;
>   }