linux-kernel - Re: [PATCH] mm/swap: Fix release_pages() when releasing devmap pages

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Message-ID: <2ac0f1cd-f076-a007-8152-c136efe60694@nvidia.com>
Date:   Thu, 23 May 2019 18:05:04 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     <ira.weiny@...el.com>, Andrew Morton <akpm@...ux-foundation.org>
CC:     Michal Hocko <mhocko@...e.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH] mm/swap: Fix release_pages() when releasing devmap pages

On 5/23/19 3:37 PM, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> Device pages can be more than type MEMORY_DEVICE_PUBLIC.
> 
> Handle all device pages within release_pages()
> 
> This was found via code inspection while determining if release_pages()
> and the new put_user_pages() could be interchangeable.
> 
> Cc: Jérôme Glisse <jglisse@...hat.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: John Hubbard <jhubbard@...dia.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> ---
>  mm/swap.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/swap.c b/mm/swap.c
> index 3a75722e68a9..d1e8122568d0 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -739,15 +739,14 @@ void release_pages(struct page **pages, int nr)
>  		if (is_huge_zero_page(page))
>  			continue;
>  
> -		/* Device public page can not be huge page */
> -		if (is_device_public_page(page)) {
> +		if (is_zone_device_page(page)) {
>  			if (locked_pgdat) {
>  				spin_unlock_irqrestore(&locked_pgdat->lru_lock,
>  						       flags);
>  				locked_pgdat = NULL;
>  			}
> -			put_devmap_managed_page(page);
> -			continue;
> +			if (put_devmap_managed_page(page))
> +				continue;
>  		}
>  
>  		page = compound_head(page);
> 

Reviewed-by: John Hubbard <jhubbard@...dia.com>

thanks,
-- 
John Hubbard
NVIDIA