linux-kernel - Re: [PATCH RFC] perf: fix find_swevent

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Message-ID: <20100520070403.GB5309@nowhere>
Date:	Thu, 20 May 2010 09:04:06 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	acme@...hat.com
Subject: Re: [PATCH RFC] perf: fix find_swevent_head() RCU lockdep splat

On Fri, May 14, 2010 at 09:47:05AM +0200, Peter Zijlstra wrote:
> On Thu, 2010-05-13 at 22:48 +0200, Frederic Weisbecker wrote:
> > +       head = find_swevent_head(cpuctx, event->attr.type,
> > +                                event->attr.config, event); 
> 
> might as well only pass event and have the function do those derefs.


Yeah, why not. But now that I see we can optimize the scheduling
side with rcu_dereference_protected, it's probably better to keep
the two derefs protected.

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