linux-kernel - Re: [V2 PATCH] kthread_work: Make lockdep happy

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Message-ID: <20101221125934.GA13285@htj.dyndns.org>
Date:	Tue, 21 Dec 2010 13:59:36 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Andy Walls <awalls@...metrocast.net>, linux-kernel@...r.kernel.org,
	nicolas.mailhot@...oste.net, Jarod Wilson <jarod@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [V2 PATCH] kthread_work: Make lockdep happy

Hello,

On Tue, Dec 21, 2010 at 12:40:50PM +0800, Yong Zhang wrote:
> From: Yong Zhang <yong.zhang0@...il.com>
> Subject: [V2 PATCH] kthread_work: Make lockdep happy
> 
> spinlock in kthread_worker and wait_queue_head in kthread_work
> both should be lockdep sensible.
> So change the interface to make it suiltable for CONFIG_LOCKDEP.
> 
> Reported-by: Nicolas <nicolas.mailhot@...oste.net>
> Signed-off-by: Yong Zhang <yong.zhang0@...il.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Andy Walls <awalls@...metrocast.net>
> ---
> Changes from V1:
>  *According to Tejun, kthread_worker could be defined on stack,
>   So introduce DEFINE_KTHREAD_WORKER_ONSTACK.
>  *Change wrong setting to kthread_work->task. Thanks Adny for
>   pointing it.
>  *including some minor issue.
> 
> BTW, only passed build.

If somebody can confirm this makes lockdep behave correctly, I'll
route it through the wq tree.

Thanks.

-- 
tejun
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