linux-kernel - Re: [PATCH v3 06/13] pagemap: use walk->vma instead of calling find

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Message-ID: <20140630120349.GV19833@node.dhcp.inet.fi>
Date:	Mon, 30 Jun 2014 15:03:49 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v3 06/13] pagemap: use walk->vma instead of calling
 find_vma()

On Fri, Jun 20, 2014 at 04:11:32PM -0400, Naoya Horiguchi wrote:
> Page table walker has the information of the current vma in mm_walk, so
> we don't have to call find_vma() in each pagemap_hugetlb_range() call.
> 
> NULL-vma check is omitted because we assume that we never run hugetlb_entry()
> callback on the address without vma. And even if it were broken, null pointer
> dereference would be detected, so we can get enough information for debugging.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov
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