linux-kernel - Re: 2.6.19-rc2-mm1

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Message-ID: <45387CCD.9030005@freenet.de>
Date:	Fri, 20 Oct 2006 09:37:49 +0200
From:	Carsten Otte <cotte@...enet.de>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	Andrew Morton <akpm@...l.org>, Cedric Le Goater <clg@...ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Gabriel C <nix.or.die@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.19-rc2-mm1

Nick Piggin wrote:
 > I don't believe filemap_xip holds the page lock, so you don't need to do
 > the atomic copy, and you don't need to do the fault_in_pages_readable.
No, we don't hold the page lock. Xip pages are property of the block 
device driver, are not in the page lru, and by calling get_xip_page we 
retrieved a reference to that page which remains valid until the file 
system is unmounted / the block device is closed.
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