[PATCH] arc: Re-enable MMU upon die()

[Alexey Brodkin]

Hi Jose,

On Fri, 2017-09-01 at 12:39 +0100, Jose Abreu wrote:
> I recently came upon a scenario where I would get a double fault
> after a machine check error. It turns out that for Ksymbol lookup
> to work with modules we need to have MMU enabled because module
> address is mapped in the cached space.
> 
> This patch re-enables the MMU before start printing the stacktrace
> making stacktracing of modules work upon a fatal exception.

I'm wondering how do we end up with MMU disabled?
From ARC700 databook I cannot find any condition on which MMU could be
silently disabled by hardware and IIRC there's no code in Linux kernel
that disables MMU.

-Alexey