linux-ext4 - Re: [PATCHv6 08/37] filemap: handle huge pages in do_generic_file

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Date:   Mon, 13 Feb 2017 08:09:59 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-block@...r.kernel.org
Subject: Re: [PATCHv6 08/37] filemap: handle huge pages in
 do_generic_file_read()

On Mon, Feb 13, 2017 at 08:01:17AM -0800, Matthew Wilcox wrote:
> On Mon, Feb 13, 2017 at 06:33:42PM +0300, Kirill A. Shutemov wrote:
> > No. pagecache_get_page() returns subpage. See description of the first
> > patch.

Oh, I re-read patch 1 and it made sense now.  I missed the bit where
pagecache_get_page() called page_subpage().