linux-kernel - Re: [PATCH 05/10] mm/hugetlb: remove the redundant check on non_swap

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Date:   Fri, 7 Aug 2020 20:55:50 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Wei Yang <richard.weiyang@...ux.alibaba.com>
Cc:     mike.kravetz@...cle.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/10] mm/hugetlb: remove the redundant check on
 non_swap_entry()

On 08/07/20 at 05:12pm, Wei Yang wrote:
> Migration and hwpoison entry is a subset of non_swap_entry().
> 
> Remove the redundant check on non_swap_entry().
> 
> Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>

Hmm, I have posted one patch to do the same thing, got reivewed by
people.

https://lore.kernel.org/linux-mm/20200723104636.GS32539@MiWiFi-R3L-srv/

> ---
>  mm/hugetlb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index d775e514eb2e..f5f04e89000d 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3778,7 +3778,7 @@ bool is_hugetlb_entry_migration(pte_t pte)
>  	if (huge_pte_none(pte) || pte_present(pte))
>  		return false;
>  	swp = pte_to_swp_entry(pte);
> -	if (non_swap_entry(swp) && is_migration_entry(swp))
> +	if (is_migration_entry(swp))
>  		return true;
>  	else
>  		return false;
> @@ -3791,7 +3791,7 @@ static int is_hugetlb_entry_hwpoisoned(pte_t pte)
>  	if (huge_pte_none(pte) || pte_present(pte))
>  		return 0;
>  	swp = pte_to_swp_entry(pte);
> -	if (non_swap_entry(swp) && is_hwpoison_entry(swp))
> +	if (is_hwpoison_entry(swp))
>  		return 1;
>  	else
>  		return 0;
> -- 
> 2.20.1 (Apple Git-117)
> 
>