linux-kernel - Re: [kvm-devel] [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges

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Date:	Wed, 30 Jan 2008 18:51:26 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	steiner@....com, linux-kernel@...r.kernel.org,
	Avi Kivity <avi@...ranet.com>, kvm-devel@...ts.sourceforge.net,
	daniel.blueman@...drics.com, Robin Holt <holt@....com>,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [kvm-devel] [patch 2/6] mmu_notifier: Callbacks to invalidate
 address ranges

On Thu, 31 Jan 2008, Andrea Arcangeli wrote:

> On Wed, Jan 30, 2008 at 06:08:14PM -0800, Christoph Lameter wrote:
> >  		hlist_for_each_entry_safe_rcu(mn, n, t,
> 				         ^^^^
> 
> >  					  &mm->mmu_notifier.head, hlist) {
> >  			hlist_del_rcu(&mn->hlist);
> 				 ^^^^
> 
> _rcu can go away from both, if hlist_del_rcu can be called w/o locks.

True. hlist_del_init ok? That would allow to check the driver that the 
mmu_notifier is already linked in using !hlist_unhashed(). Driver then 
needs to properly initialize the mmu_notifier list with INIT_HLIST_NODE().


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