Subject: Re: [RFC][PATCH] make /proc/pid/pagemap work with huge pages and
	return page size
From: Dave Hansen <haveblue@us.ibm.com>
To: Hans Rosenfeld <hans.rosenfeld@amd.com>
Cc: Matt Mackall <mpm@selenic.com>, linux-kernel@vger.kernel.org,
       Adam Litke <aglitke@gmail.com>, nacc <nacc@linux.vnet.ibm.com>,
       Jon Tollefson <kniht@linux.vnet.ibm.com>,
       Adam Litke <agl@linux.vnet.ibm.com>
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Date: Wed, 05 Mar 2008 08:32:46 -0800
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On Wed, 2008-03-05 at 17:00 +0100, Hans Rosenfeld wrote:
> 
> There are a few reserved bits in the pte part of the union that could
> be
> used to extend the pfn or add more status bits in future (a ronly bit,

Were you able to find any other instances of these bitfields being used
for kernel<->user communication?  I thought you were going to check to
see if we could depend on the layout, or if it changed between
compilers.

-- Dave

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