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Subject: Re: [PATCH 3/5] mm/hugetlb.c: Remove the unnecessary non_swap_entry()
To:     Baoquan He <bhe@redhat.com>, linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, mike.kravetz@oracle.com,
        akpm@linux-foundation.org
References: <20200720062623.13135-1-bhe@redhat.com>
 <20200720062623.13135-4-bhe@redhat.com>
From:   David Hildenbrand <david@redhat.com>
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Organization: Red Hat GmbH
Message-ID: <83aeaeb8-560e-4777-6a64-7ca970de1638@redhat.com>
Date:   Tue, 21 Jul 2020 11:56:34 +0200
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On 20.07.20 08:26, Baoquan He wrote:
> The checking is_migration_entry() and is_hwpoison_entry() are stricter
> than non_swap_entry(), means they have covered the conditional check
> which non_swap_entry() is doing.
> 
> Hence remove the unnecessary non_swap_entry() in is_hugetlb_entry_migration()
> and is_hugetlb_entry_hwpoisoned() to simplify code.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> ---
>  mm/hugetlb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index a58f976a9dd9..467894d8332a 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3748,7 +3748,7 @@ 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;
> @@ -3761,7 +3761,7 @@ static bool is_hugetlb_entry_hwpoisoned(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_hwpoison_entry(swp))
> +	if (is_hwpoison_entry(swp))
>  		return true;
>  	else
>  		return false;
> 

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Thanks,

David / dhildenb