linux-kernel - Re: [patch 2/4] mmu_notifier: Callbacks to invalidate address ranges

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Message-ID: <Pine.LNX.4.64.0802011517430.20608@schroedinger.engr.sgi.com>
Date:	Fri, 1 Feb 2008 15:19:32 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Robin Holt <holt@....com>
cc:	Andrea Arcangeli <andrea@...ranet.com>,
	Avi Kivity <avi@...ranet.com>, Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [patch 2/4] mmu_notifier: Callbacks to invalidate address ranges

On Fri, 1 Feb 2008, Robin Holt wrote:

> We are getting this callout when we transition the pte from a read-only
> to read-write.  Jack and I can not see a reason we would need that
> callout.  It is causing problems for xpmem in that a write fault goes
> to get_user_pages which gets back to do_wp_page that does the callout.

Right. You placed it there in the first place. So we can drop the code 
from do_wp_page?

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