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Date: Sat, 26 May 2012 17:59:12 +0200
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH 03/35] xen: document Xen is using an unused bit for the
 pagetables
Message-ID: <20120526155912.GA4054@redhat.com>
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Hillf Danton <dhillf@gmail.com>, Dan Smith <danms@us.ibm.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>, Paul Turner <pjt@google.com>, Suresh Siddha <suresh.b.siddha@intel.com>, Mike Galbraith <efault@gmx.de>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, Bharata B Rao <bharata.rao@gmail.com>, Lee Schermerhorn <Lee.Schermerhorn@hp.com>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>, Christoph Lameter <cl@linux.com>

Hi Konrad,

On Fri, May 25, 2012 at 04:26:56PM -0400, Konrad Rzeszutek Wilk wrote:
> On Fri, May 25, 2012 at 07:02:07PM +0200, Andrea Arcangeli wrote:
> > Xen has taken over the last reserved bit available for the pagetables
> > which is set through ioremap, this documents it and makes the code
> > more readable.
> 
> Andrea, my previous respone had a question about this - was wondering
> if you had a chance to look at that in your busy schedule and provide
> some advice on how to remove the _PAGE_IOMAP altogether?

I read you response but I didn't look into the P2M tree and
xen_val_pte code yet sorry. Thanks for looking into this, if it's
possible to remove it without downsides, it would be a nice
cleanup. It's not urgent though, we're not running out of reserved
pte bits yet :).

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