linux-kernel - Re: [PATCH UPDATED] workqueue: relax lockdep annotation on flush

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Date:	Mon, 3 Jan 2011 16:20:17 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...hat.com>, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH UPDATED] workqueue: relax lockdep annotation on
 flush_work()

On Mon, Jan 03, 2011 at 04:14:45PM +0100, Peter Zijlstra wrote:
> > Hmmm?  The code applies the most strict contraints.  If the workqueue
> > has a rescuer, flushing another work from the workqueue will always
> > trigger lockdep warning.  The rule is relaxed only for workqueues
> > which aren't used for memory reclaiming && support parallel execution.
> 
> Ah, ok. I read it like: if the current thread is a rescue thread.

Ah, I see.  Rafael, can you please verify the updated version is okay
too (it should be but just in case)?  Peter, shall I route this
through workqueue tree with your ack?

Thank you.

-- 
tejun
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