linux-kernel - Re: [patch 1/9] EMM Notifier: The notifier calls

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Date:	Wed, 2 Apr 2008 14:54:52 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Hugh Dickins <hugh@...itas.com>, Robin Holt <holt@....com>,
	Avi Kivity <avi@...ranet.com>, Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com, Nick Piggin <npiggin@...e.de>
Subject: Re: [patch 1/9] EMM Notifier: The notifier calls

On Wed, 2 Apr 2008, Andrea Arcangeli wrote:

> > Hmmm... Okay that is one solution that would just require a BUG_ON in the 
> > registration methods.
> 
> Perhaps you didn't notice that this solution can't work if you call
> range_begin/end not in the "current" context and try_to_unmap_cluster
> does exactly that for both my patchset and yours. Missing an _end is
> ok, missing a _begin is never ok.

If you look at the patch you will see a requirement of holding a 
writelock on mmap_sem which will keep out get_user_pages().
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