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Date: Thu, 31 Jan 2008 18:39:19 -0800 (PST)
From: Christoph Lameter <clameter@sgi.com>
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To: Robin Holt <holt@sgi.com>
cc: Andrea Arcangeli <andrea@qumranet.com>, Avi Kivity <avi@qumranet.com>,
       Izik Eidus <izike@qumranet.com>, kvm-devel@lists.sourceforge.net,
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       linux-kernel@vger.kernel.org, linux-mm@kvack.org,
       daniel.blueman@quadrics.com
Subject: Re: [patch 1/3] mmu_notifier: Core code
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On Thu, 31 Jan 2008, Robin Holt wrote:

> Jack has repeatedly pointed out needing an unregister outside the
> mmap_sem.  I still don't see the benefit to not having the lock in the mm.

I never understood why this would be needed. ->release removes the 
mmu_notifier right now.