linux-kernel - Re: [PATCH] Markers : fix reentrancy

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Date:	Tue, 30 Sep 2008 09:09:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>
Subject: Re: [PATCH] Markers : fix reentrancy


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> Lai Jiangshan <laijs@...fujitsu.com> wrote :
> > marker_synchronize_unregister must be called _also_ between unregistration
> > and destruction the data that unregistration-ed probes need to make sure
> > there is no caller executing a probe when it's data is destroyed.
> > 
> 
> Ah, you're right. I looked again through your patch description and I
> think using a :
> 
> 
> if (entry->rcu_pending)
>                 rcu_barrier_sched();
> 
> After each time the markers_mutex is taken would keep the fast batch 
> registration/unregistration and fix the reentrancy problem. The 
> following patch should address the problem.

could you please send a delta patch against tip/master? Lai's patch is 
already applied and is tested. Thanks,

	Ingo
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