linux-kernel - Re: [PATCHv2 10/12] mm: convert page_mapped_in_vma() to page_vma_mapped

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Date:   Thu, 26 Jan 2017 15:31:58 +0800
From:   "Hillf Danton" <hillf.zj@...baba-inc.com>
To:     "'Kirill A. Shutemov'" <kirill.shutemov@...ux.intel.com>,
        "'Andrea Arcangeli'" <aarcange@...hat.com>,
        "'Hugh Dickins'" <hughd@...gle.com>,
        "'Rik van Riel'" <riel@...hat.com>,
        "'Andrew Morton'" <akpm@...ux-foundation.org>
Cc:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 10/12] mm: convert page_mapped_in_vma() to page_vma_mapped_walk()


On January 26, 2017 2:26 AM Kirill A. Shutemov wrote: 
> 
> For consistency, it worth converting all page_check_address() to
> page_vma_mapped_walk(), so we could drop the former.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
Acked-by: Hillf Danton <hillf.zj@...baba-inc.com>

>  mm/page_vma_mapped.c | 30 ++++++++++++++++++++++++++++++
>  mm/rmap.c            | 26 --------------------------
>  2 files changed, 30 insertions(+), 26 deletions(-)
> 
> diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
> index 63168b4baf19..13929f2418b0 100644
> --- a/mm/page_vma_mapped.c
> +++ b/mm/page_vma_mapped.c
> @@ -179,3 +179,33 @@ next_pte:	do {
>  		}
>  	}
>  }
> +
> +/**
> + * page_mapped_in_vma - check whether a page is really mapped in a VMA
> + * @page: the page to test
> + * @vma: the VMA to test
> + *
> + * Returns 1 if the page is mapped into the page tables of the VMA, 0
> + * if the page is not mapped into the page tables of this VMA.  Only
> + * valid for normal file or anonymous VMAs.
> + */
> +int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma)
> +{
> +	struct page_vma_mapped_walk pvmw = {
> +		.page = page,
> +		.vma = vma,
> +		.flags = PVMW_SYNC,
> +	};
> +	unsigned long start, end;
> +
> +	start = __vma_address(page, vma);
> +	end = start + PAGE_SIZE * (hpage_nr_pages(page) - 1);
> +
> +	if (unlikely(end < vma->vm_start || start >= vma->vm_end))
> +		return 0;
> +	pvmw.address = max(start, vma->vm_start);

Nit: please see comment in the 05/12 patch in this series.

> +	if (!page_vma_mapped_walk(&pvmw))
> +		return 0;
> +	page_vma_mapped_walk_done(&pvmw);
> +	return 1;
> +}