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

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Message-ID: <20100520070433.GC5309@nowhere>
Date:	Thu, 20 May 2010 09:04:35 +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 09:44:24AM +0200, Peter Zijlstra wrote:
> On Thu, 2010-05-13 at 21:03 +0200, Frederic Weisbecker wrote:
> > hlist = rcu_dereference_check(ctx->swevent_hlist,
> >                               rcu_read_lock_held() ||
> >                               raw_spin_lock_is_held(&ctx->lock)); 
> 
> raw_spin_lock_is_held() is wrong, that should read:
> lockdep_is_held(&ctx->lock).
> 
> raw_spin_lock_is_held() only checks if the lock is locked,
> lockdep_is_held() ensures we are the one holding it.


Right!

Thanks.

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