linux-kernel - Re: [PATCH 1/2] MIPS: OCTEON: fix kernel crash when offlining a CPU

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Date:	Thu, 15 Jan 2015 12:10:08 -0800
From:	David Daney <ddaney.cavm@...il.com>
To:	Aaro Koskinen <aaro.koskinen@....fi>
CC:	Ralf Baechle <ralf@...ux-mips.org>,
	David Daney <david.daney@...ium.com>,
	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Hemmo Nieminen <hemmo.nieminen@....fi>, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] MIPS: OCTEON: fix kernel crash when offlining a CPU

On 01/15/2015 11:53 AM, Aaro Koskinen wrote:
> Hi,
>
> On Thu, Jan 15, 2015 at 11:36:12AM -0800, David Daney wrote:
>> On 01/15/2015 10:49 AM, Aaro Koskinen wrote:
>>> octeon_cpu_disable() will unconditionally enable interrupts when called
>>> with interrupts disabled. Fix that.
>>
>> interrupts are always disabled here, so...
>
> Is that also true for all the currently supported stable kernels...?

I haven't done extensive research recently, but I have removed that pair 
of local_irq_disable/local_irq_enable in our SDK kernel based on 3.10


> Or should I just drop Cc: stable from this patch?
>
>> Just remove this...
>>
>>>   	octeon_fixup_irqs();
>>> -	local_irq_enable();
>>> +	local_irq_restore(flags);
>>
>> ... and this.
>>
>>>
>>>   	flush_cache_all();
>>>   	local_flush_tlb_all();
>>>
>>
>> You can add an Acked-by me if you do that.
>
> Ok, I will do that.
>
> A.
>
>

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