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Date: Thu, 5 Feb 2009 14:30:29 -0500 (EST)
From: Christoph Lameter <cl@linux-foundation.org>
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To: Robin Holt <holt@sgi.com>
cc: linux-mm@kvack.org, Andrea Arcangeli <andrea@qumranet.com>,
       Nick Piggin <npiggin@suse.de>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [Patch] mmu_notifiers destroyed by __mmu_notifier_release()
 retain extra mm_count.
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The drop of the refcount needs to occur  after the last use of
data in the mmstruct because mmdrop() may free the mmstruct.

Place it after the synchronize_rcu?