[PATCH] powerpc: Invalidate ERAT on powersave wakeup for POWER9

[Anshuman Khandual]

On 06/22/2017 10:56 PM, Michael Neuling wrote:
> On POWER9 the ERAT may be incorrect on wakeup from some stop states
> that lose state. This causes random segvs and illegal instructions
> when these stop states are enabled.
> 
> This patch invalidates the ERAT on wakeup on POWER9 to prevent this
> from causing a problem.

Cant there be any real genuine ERAT error on the wake up path
from these states ? Just being curious.