linux-kernel - Re: [PATCH RFC tip/core/rcu 23/23] vhost: add _

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Message-ID: <1273756043.5605.3542.camel@twins>
Date:	Thu, 13 May 2010 15:07:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, Arnd Bergmann <arnd@...ay.de.ibm.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH RFC tip/core/rcu 23/23] vhost: add __rcu annotations

On Wed, 2010-05-12 at 16:00 -0700, Paul E. McKenney wrote:
> Any thoughts?  One approach would be to create a separate lockdep class
> for vhost workqueue state, similar to the approach used in instrument
> rcu_read_lock() and friends. 

workqueue_struct::lockdep_map, its held while executing worklets.

lock_is_held(&vhost_workqueue->lockdep_map), should do as you want.
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