Re: [PATCH v2] irqchip/gic: Allow self-SGIs for SMP on UP configurations

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Hi Marc,

On Fri, Sep 9, 2016 at 11:40 AM, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
> Hi Fabio,
>
> On 09/09/16 14:44, Fabio Estevam wrote:
>> From: Marc Zyngier <marc.zyngier@xxxxxxx>
>>
>> commit 059e232089e45b0befc9933d31209c225e08b426 upstream.
>>
>> On systems where a single CPU is present, the GIC may not support
>> having SGIs delivered to a target list. In that case, we use the
>> self-SGI mechanism to allow the interrupt to be delivered locally.
>>
>> Cc: <stable@xxxxxxxxxxxxxxx> # 4.7.x
>> Tested-by: Fabio Estevam <fabio.estevam@xxxxxxx>
>> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
>> Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxx>
>
> I'm sorry, but what is the justification for this to be backported to a
> stable kernel? It is not a regression, since we never supported this

Without this patch imx6ul SoC hangs after a 'reboot' command.

> kind of HW before. This is not a workaround for an erratum either.
>
> If that was a kernel bug, why not backport it all the way the the oldest
> stable, instead of limiting it to v4.7?

I can send it to 4.4 as well, if you agree.
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