[PATCH] Emulate sync instruction variants

[Benjamin Herrenschmidt]

On Thu, 2013-07-04 at 09:31 +0100, David Laight wrote:
> Do you need to execute 'sync' here?
> It is worth checking whether the trap entry/exit doesn't
> do an implicit one for you.

Not really. It does an implicit isync (more than one even) but
not a sync.

Cheers,
Ben.