linux-kernel - Re: [PATCH 5/5] metag: cpu hotplug: route

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Date:	Tue, 2 Jul 2013 10:59:06 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
CC:	<linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 5/5] metag: cpu hotplug: route_irq: preserve irq mask

On 02/07/13 07:16, Srivatsa S. Bhat wrote:
> On 07/01/2013 09:34 PM, James Hogan wrote:
>> The route_irq() function needs to preserve the irq mask by using the
>> _irqsave/irqrestore variants of raw spin lock functions instead of the
>> _irq variants. This is because it is called from __cpu_disable() (via
>> migrate_irqs()), which is called with IRQs disabled, so using the _irq
>> variants re-enables IRQs.
>>
>> This appears to have been causing occasional hits of the
>> BUG_ON(!irqs_disabled()) in __irq_work_run() during CPU hotplug soak
>> testing:
>>   BUG: failure at kernel/irq_work.c:122/__irq_work_run()!
>>
>> Signed-off-by: James Hogan <james.hogan@...tec.com>
>> ---
> 
> Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Thanks for taking the time to review these patches

Cheers
James

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