linux-kernel - Re: [PATCH 01/15] mm/swap: use helper is_swap_pte() in swap_vma

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Date:   Wed, 18 May 2022 10:31:28 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, willy@...radead.org, vbabka@...e.cz,
        dhowells@...hat.com, neilb@...e.de, apopple@...dia.com,
        david@...hat.com, surenb@...gle.com, peterx@...hat.com,
        naoya.horiguchi@....com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/15] mm/swap: use helper is_swap_pte() in
 swap_vma_readahead

On Mon, May 09, 2022 at 09:14:02PM +0800, Miaohe Lin wrote:
> Use helper is_swap_pte() to check whether pte is swap entry to make code
> more clear. Minor readability improvement.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

> ---
>  mm/swap_state.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/swap_state.c b/mm/swap_state.c
> index 577c2848ae49..240b39ed5922 100644
> --- a/mm/swap_state.c
> +++ b/mm/swap_state.c
> @@ -818,9 +818,7 @@ static struct page *swap_vma_readahead(swp_entry_t fentry, gfp_t gfp_mask,
>  	for (i = 0, pte = ra_info.ptes; i < ra_info.nr_pte;
>  	     i++, pte++) {
>  		pentry = *pte;
> -		if (pte_none(pentry))
> -			continue;
> -		if (pte_present(pentry))
> +		if (!is_swap_pte(pentry))
>  			continue;
>  		entry = pte_to_swp_entry(pentry);
>  		if (unlikely(non_swap_entry(entry)))
> -- 
> 2.23.0
> 
> 

-- 
Oscar Salvador
SUSE Labs