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

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On Fri, Sep 09, 2016 at 05:06:02PM +0100, Marc Zyngier wrote:
> On 09/09/16 16:48, Fabio Estevam wrote:
> > Hi Marc,
> > 
> > On Fri, Sep 9, 2016 at 12:42 PM, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
> > 
> >>> Without this patch imx6ul SoC hangs after a 'reboot' command.
> >>
> >> But that's not a regression, right? It *never* worked before, as far as
> >> I know, because we never supported such a configuration in the past.
> > 
> > imx6ul is supported since kernel 4.3.
> 
> And yet nobody reported this as an issue until the 4.8 cycle. So it
> doesn't look like it was annoying anyone until then.
> 
> > 
> >> I'm a bit concerned when I see backporting random patches to random
> >> kernel versions for things that are not bugs. I'll leave it up to Greg
> >> to decide, but I thought I should point out what this patch actually is.
> > 
> > Not bugs? I consider the hang I get after running 'reboot' on imx6ul a bug.
> > 
> > According to Documentation/stable_kernel_rules.txt :
> > 
> > " - It must fix a problem that causes a build error (but not for things
> >    marked CONFIG_BROKEN), an oops, a hang, data corruption, a real
> >    security issue, or some "oh, that's not good" issue.  In short, something
> >    critical. "
> > 
> > , so that's why I submitted for stable inclusion.
> > 
> 
> I don't, which is why I didn't tag it for stable the first place. I
> consider this as an unsupported configuration (MP CPU on a UP GIC),
> which we start supporting from 4.8 onward.
> 
> Anyway, I'm not going to argue any further for such a small patch, but
> I've made my position clear.

As the maintainer wants this removed, I've now dropped it from the
4.7-stable queue.

Fabio, just use 4.8 on this hardware and you should be fine.

thanks,

greg k-h
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