linux-kernel - Re: v3.0: Weird kernel log message when resuming avout NMI received

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Date:	Mon, 01 Aug 2011 14:12:34 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Francis Moreau <francis.moro@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Don Zickus <dzickus@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...e.hu>, Jiri Slaby <jirislaby@...il.com>
Subject: Re: v3.0: Weird kernel log message when resuming avout NMI received

On Mon, 2011-08-01 at 15:21 +0400, Cyrill Gorcunov wrote:
> >       mutex_lock(&swhash->hlist_mutex);
> > -     if (swhash->hlist_refcount > 0) {
> > +     if (swhash->hlist_refcount > 0 && !swhash->swevent_hlist) {
> 
> Should not there be rcu_dereference(swhash->swevent_hlist)? 

swhash->hlist_mutex is the modifier lock for that rcu use and should
thus serialize things sufficiently.

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