linux-kernel - Re: [PATCHv2, RFC 14/30] thp, mm: naive support of thp in generic read/write routines

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Date:	Fri, 15 Mar 2013 11:11:32 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2, RFC 14/30] thp, mm: naive support of thp in generic
 read/write routines

On Fri, Mar 15, 2013 at 1:50 AM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> +               if (PageTransTail(page)) {
> +                       page_cache_release(page);
> +                       page = find_get_page(mapping,
> +                                       index & ~HPAGE_CACHE_INDEX_MASK);
check page is valid, please.

> +                       if (!PageTransHuge(page)) {
> +                               page_cache_release(page);
> +                               goto find_page;
> +                       }
> +               }
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