linux-kernel - Re: 2.6.34-rc1: rcu lockdep bug?

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Message-ID: <1268647460.3154.1.camel@edumazet-laptop>
Date:	Mon, 15 Mar 2010 11:04:20 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Miller <davem@...emloft.net>, peterz@...radead.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 2.6.34-rc1: rcu lockdep bug?

Le lundi 15 mars 2010 à 17:39 +0800, Américo Wang a écrit :

> 
> Ok, I think I found what lockdep really complains about, it is that we took
> spin_lock in netpoll_poll_lock() which is in hardirq-enabled environment,
> later, we took another spin_lock with spin_lock_irqsave() in netpoll_rx(),
> so lockdep thought we broke the locking rule.
> 
> I don't know why netpoll_rx() needs irq disabled, it looks like that no one
> takes rx_lock in hardirq context. So can we use spin_lock(&rx_lock)
> instead? Or am I missing something here? Eric? David?

I am a bit lost.

Could you give the complete picture, because I cannot find it in my
netdev archives.



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