linux-kernel - Re: [PATCH -mm v2] mm: add page_check_address

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Message-ID: <20151124181521.GA19885@cmpxchg.org>
Date:	Tue, 24 Nov 2015 13:15:21 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Vladimir Davydov <vdavydov@...tuozzo.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm v2] mm: add page_check_address_transhuge helper

On Tue, Nov 24, 2015 at 12:36:17PM +0300, Vladimir Davydov wrote:
> diff --git a/include/linux/rmap.h b/include/linux/rmap.h
> index b9eedc63e9e6..77d1ba57d495 100644
> --- a/include/linux/rmap.h
> +++ b/include/linux/rmap.h
> @@ -219,9 +219,20 @@ static inline pte_t *page_check_address(struct page *page, struct mm_struct *mm,
>   * Used by idle page tracking to check if a page was referenced via page
>   * tables.
>   */
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  bool page_check_address_transhuge(struct page *page, struct mm_struct *mm,
>  				  unsigned long address, pmd_t **pmdp,
>  				  pte_t **ptep, spinlock_t **ptlp);
> +#else
> +static inline bool page_check_address_transhuge(struct page *page,
> +				struct mm_struct *mm, unsigned long address,
> +				pmd_t **pmdp, pte_t **ptep, spinlock_t **ptlp)
> +{
> +	*ptep = page_check_address(page, mm, address, ptlp, 0);
> +	*pmdp = NULL;
> +	return !!*ptep;
> +}
> +#endif

Tested-by: Johannes Weiner <hannes@...xchg.org>
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