linux-kernel - Re: [PATCH 2/2] workqueue: debug work related deadlocks with lockdep

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Message-Id: <1183718633.3818.96.camel@johannes.berg>
Date:	Fri, 06 Jul 2007 12:43:53 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 2/2] workqueue: debug work related deadlocks with
	lockdep

On Thu, 2007-07-05 at 19:36 +0400, Oleg Nesterov wrote:

> So, __WORK_INITIALIZER() uses work_struct itself as a "struct lock_class_key" ?
> How so?

Well, this is for work_structs that are static (not dynamically
allocated.) struct lock_class_key is just a single byte because its
whole purpose is to be a unique pointer, there's nothing actually in it.
Hence, taking the address of the work struct (when it's statically
allocated) is a unique pointer just as well.

johannes

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