linux-kernel - Re: [PATCH 01 of 12] Core of mmu notifiers

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Message-ID: <20080423183718.GL24536@duo.random>
Date:	Wed, 23 Apr 2008 20:37:18 +0200
From:	Andrea Arcangeli <andrea@...ranet.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Robin Holt <holt@....com>, Nick Piggin <npiggin@...e.de>,
	Jack Steiner <steiner@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>,
	linux-mm@...ck.org, general@...ts.openfabrics.org,
	Hugh Dickins <hugh@...itas.com>, akpm@...ux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 01 of 12] Core of mmu notifiers

On Wed, Apr 23, 2008 at 11:27:21AM -0700, Christoph Lameter wrote:
> There is a potential issue in move_ptes where you call 
> invalidate_range_end after dropping i_mmap_sem whereas my patches did the 
> opposite. Mmap_sem saves you there?

Yes, there's really no risk of races in this area after introducing
mm_lock, any place that mangles over ptes and doesn't hold any of the
three locks is buggy anyway. I appreciate the audit work (I also did
it and couldn't find bugs but the more eyes the better).
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