netdev - Re: [Bugme-new] [Bug 18492] New: kernel softirq warning on boot

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Message-Id: <20100917.165536.254856822.davem@davemloft.net>
Date:	Fri, 17 Sep 2010 16:55:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hramrach@...trum.cz
Cc:	herbert@...dor.apana.org.au, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 18492] New: kernel softirq warning on boot

From: Michal Suchanek <hramrach@...trum.cz>
Date: Fri, 17 Sep 2010 20:00:42 +0200

> On 15 September 2010 08:46, Herbert Xu <herbert@...dor.apana.org.au> wrote:
>> On Tue, Sep 14, 2010 at 02:11:03PM -0700, David Miller wrote:
>>>
>>> I'll take a closer look at this if Herbert doesn't beat me to it.
>>
>> I thought we were going to use this patch until Paul's BH warning
>> removal made it into mainline?
>>
>> netpoll: Disable IRQ around RCU dereference in netpoll_rx
>>
>> We cannot use rcu_dereference_bh safely in netpoll_rx as we may
>> be called with IRQs disabled.  We could however simply disable
>> IRQs as that too causes BH to be disabled and is safe in either
>> case.
>>
>> Thanks to John Linville for discovering this bug and providing
>> a patch.
>>
> With the patch applied I no longet get the warning.

Ok I'll toss this upstream since I have no indication that Paul's
RCU change will hit Linus's tree any time soon.

Thanks.
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