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Subject: Re: [PATCH v2] mm: remove redundant check non_swap_entry()
To:     Ralph Campbell <rcampbell@nvidia.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Cc:     Jerome Glisse <jglisse@redhat.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Christoph Hellwig <hch@lst.de>,
        Jason Gunthorpe <jgg@mellanox.com>,
        Andrew Morton <akpm@linux-foundation.org>
References: <20200615175405.4613-1-rcampbell@nvidia.com>
From:   David Hildenbrand <david@redhat.com>
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Message-ID: <ab1df72b-2056-180c-1ffd-88fcf6b712f2@redhat.com>
Date:   Fri, 19 Jun 2020 17:11:00 +0200
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On 15.06.20 19:54, Ralph Campbell wrote:
> In zap_pte_range(), the check for non_swap_entry() and
> is_device_private_entry() is unnecessary since the latter is sufficient
> to determine if the page is a device private page. Remove the test for
> non_swap_entry() to simplify the code and for clarity.
> 
> Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
> Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
> ---
> 
> This is based on the linux 5.8.0-rc1 tree and is intended for Andrew's mm
> tree. There is no rush so it could go into 5.9 but I think it is safe
> enough to go into an rc after the patch is reviewed.
> 
> Changes since v1:
> Updated the change log to be more clear.
> Added Jason Gunthorpe's reviewed-by.
> Rebased to 5.8.0-rc1
> 
>  mm/memory.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index dc7f3543b1fd..bdbb4f97e7d0 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -1098,7 +1098,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
>  		}
>  
>  		entry = pte_to_swp_entry(ptent);
> -		if (non_swap_entry(entry) && is_device_private_entry(entry)) {
> +		if (is_device_private_entry(entry)) {
>  			struct page *page = device_private_entry_to_page(entry);
>  
>  			if (unlikely(details && details->check_mapping)) {
> 

Looks like 5.9 material. LGTM

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


-- 
Thanks,

David / dhildenb