linux-kernel - Re: [Patch] mmu_notifiers destroyed by __mmu_notifier_release() retain extra mm

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Message-ID: <alpine.DEB.1.10.0902051427280.13692@qirst.com>
Date:	Thu, 5 Feb 2009 14:30:29 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Robin Holt <holt@....com>
cc:	linux-mm@...ck.org, Andrea Arcangeli <andrea@...ranet.com>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [Patch] mmu_notifiers destroyed by __mmu_notifier_release()
 retain extra mm_count.

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?
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