linux-kernel - Re: [PATCH] mm/damon: minor cleanup for damon_pa

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Date:   Wed, 16 Mar 2022 08:53:15 +0000
From:   sj@...nel.org
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, sj@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/damon: minor cleanup for damon_pa_young

Hi Miaohe,


Thank you for this patch!

On Wed, 16 Mar 2022 16:15:28 +0800 Miaohe Lin <linmiaohe@...wei.com> wrote:

> if need_lock is true but folio_trylock fails, we should return false
> instead of NULL to match the return value type exactly. No functional
> change intended.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

> ---
>  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 a01495cebdad..21474ae63bc7 100644
> --- a/mm/damon/paddr.c
> +++ b/mm/damon/paddr.c
> @@ -152,7 +152,7 @@ static bool damon_pa_young(unsigned long paddr, unsigned long *page_sz)
>  	need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
>  	if (need_lock && !folio_trylock(folio)) {
>  		folio_put(folio);
> -		return NULL;
> +		return false;
>  	}
>  
>  	rmap_walk(folio, &rwc);
> 
> -- 
> 2.23.0
> 
> 
>