linux-kernel - Re: Regression: WARNINGS and lockdep spews in 2.6.38-rc3+ (bisected).

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Message-ID: <20110203114218.GA1809@zhy>
Date:	Thu, 3 Feb 2011 19:42:19 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Nick Bowler <nbowler@...iptictech.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Regression: WARNINGS and lockdep spews in 2.6.38-rc3+
 (bisected).

On Thu, Feb 03, 2011 at 11:33:04AM +0100, Peter Zijlstra wrote:
> 
> How about we revert your patch and go back to not allowing
> del_timer_sync() from any interrupt context, 

The fact is there is someone want to use del_timer_sync()
in softirq context.
My patch is inspired by this http://lkml.org/lkml/2010/8/16/291
though in the end that issue is resolved by not using
del_timer_sync() in softirq.

> we can fix __dst_free by
> removing the need for cancel_delayed_work().
> 
> Are there any other del_timer_sync() callers from softirq?

I'm not sure about this.

IMHO, we don't need to make more restriction if we don't
have to.

Thanks,
Yong
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