Re: [PATCHv6 08/37] filemap: handle huge pages in do_generic_file_read()

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To: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Subject: Re: [PATCHv6 08/37] filemap: handle huge pages in do_generic_file_read()
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Mon, 13 Feb 2017 08:09:59 -0800
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>, Andreas Dilger <adilger.kernel@xxxxxxxxx>, Jan Kara <jack@xxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-block@xxxxxxxxxxxxxxx
In-reply-to: <20170213160117.GA6416@bombadil.infradead.org>
References: <20170126115819.58875-1-kirill.shutemov@linux.intel.com> <20170126115819.58875-9-kirill.shutemov@linux.intel.com> <20170209215505.GW2267@bombadil.infradead.org> <20170213153342.GE20394@node.shutemov.name> <20170213160117.GA6416@bombadil.infradead.org>
User-agent: Mutt/1.7.1 (2016-10-04)

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().

References:
- [PATCHv6 00/37] ext4: support of huge pages
  - From: Kirill A. Shutemov
- [PATCHv6 08/37] filemap: handle huge pages in do_generic_file_read()
  - From: Kirill A. Shutemov
- Re: [PATCHv6 08/37] filemap: handle huge pages in do_generic_file_read()
  - From: Matthew Wilcox
- Re: [PATCHv6 08/37] filemap: handle huge pages in do_generic_file_read()
  - From: Kirill A. Shutemov
- Re: [PATCHv6 08/37] filemap: handle huge pages in do_generic_file_read()
  - From: Matthew Wilcox

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