linux-kernel - Re: [PATCH 2/2] hugetlbfs: add swap entry check in follow_hugetlb

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Message-ID: <20130329135730.GB21879@dhcp22.suse.cz>
Date:	Fri, 29 Mar 2013 14:57:30 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	stable@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] hugetlbfs: add swap entry check in
 follow_hugetlb_page()

On Thu 28-03-13 11:42:38, Naoya Horiguchi wrote:
[...]
> @@ -2968,7 +2968,8 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
>  		 * first, for the page indexing below to work.
>  		 */
>  		pte = huge_pte_offset(mm, vaddr & huge_page_mask(h));
> -		absent = !pte || huge_pte_none(huge_ptep_get(pte));
> +		absent = !pte || huge_pte_none(huge_ptep_get(pte)) ||
> +			is_swap_pte(huge_ptep_get(pte));

is_swap_pte doesn't seem right. Shouldn't you use is_hugetlb_entry_hwpoisoned
instead?

-- 
Michal Hocko
SUSE Labs
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