linux-kernel - Re: [PATCH] debug work struct cancel deadlocks with lockdep

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Date:	Thu, 05 Jul 2007 11:03:24 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Oleg Nesterov <oleg@...sign.ru>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Sattler <tsattler@....de>
Subject: Re: [PATCH] debug work struct cancel deadlocks with lockdep

On Wed, 2007-07-04 at 23:12 +0200, Johannes Berg wrote:
> This adds a lockdep_map for each work struct in order to debug
> deadlocks like
>   my_function -> lock(); ...; cancel_work_sync(my_work)
> vs.
>   run_workqueue() -> my_work.f() -> ...; lock(); ...
> 
> which will deadlock if my_work.f() is invoked already but my_function()
> has acquired the lock already.
> 
> Signed-off-by: Johannes Berg <johannes@...solutions.net>

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

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