linux-kernel - Re: [RFC][PATCH] make /proc/pid/pagemap work with huge pages and return page size

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Date:	Wed, 05 Mar 2008 08:32:46 -0800
From:	Dave Hansen <haveblue@...ibm.com>
To:	Hans Rosenfeld <hans.rosenfeld@....com>
Cc:	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org,
	Adam Litke <aglitke@...il.com>, nacc <nacc@...ux.vnet.ibm.com>,
	Jon Tollefson <kniht@...ux.vnet.ibm.com>,
	Adam Litke <agl@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH] make /proc/pid/pagemap work with huge pages and
	return page size


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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