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

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On Fri, Sep 09, 2016 at 12:48:34PM -0300, 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.
> 
> > 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.

But if it never worked to start with, that's not really a regression,
that is a "make new hardware work" type thing.

Did it work properly in 4.3?  What caused support for this hardware to
break?

thanks,

greg k-h
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