ACK/cmt / APPLIED[artful]: [PATCH][Zesty] UBUNTU: SAUCE: powerpc: Only do ERAT invalidate

[Seth Forshee]

On Tue, Jun 27, 2017 at 04:09:24PM -0300, Breno Leitao wrote:
> From: Michael Neuling <mikey at neuling.org>
> 
> BugLink: https://bugs.launchpad.net/ubuntu/+bug/1700819
> 
> On P9 (Nimbus) DD2 and later, in radix mode, the move to the PID
> register will implicitly invalidate the user space ERAT entries
> and leave the kernel ones alone. Thus the only thing needed is
> an isync() to synchronize this with subsequent uaccess's
> 
> Signed-off-by: Michael Neuling <mikey at neuling.org>
> Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Signed-off-by: Breno Leitao <leitao at debian.org>

Note to whoever applies this, this is now commit
74e27c6af56fe6898c3c8c451595746a992f0f0f in linux-next, so it can be
applied as a cherry-pick and not a sauce patch.

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

Also cherry picked from linux-next to artful/master-next and
unstable/master. Thanks!