ACK / APPLIED[artful]: [PATCH][Zesty] UBUNTU: SAUCE: powerpc: Invalidate ERAT on powersave wakeup for POWER9

[Seth Forshee]

On Tue, Jun 27, 2017 at 01:45:27PM -0300, Breno Leitao wrote:
> From: Michael Neuling <mikey at neuling.org>
> 
> BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1700521
> 
> 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.
> 
> Signed-off-by: Michael Neuling <mikey at neuling.org>
> Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> (backported from: https://patchwork.ozlabs.org/patch/780365/)
> Signed-off-by: Breno Leitao <leitao at debian.org>

Acked-by: Seth Forshee <seth.forshee at canonical.com>

I also applied this to artful/master-next and unstable/master, using the
patch from patchworks since this backport didn't apply cleanly.