The bzero/memset implementation stays the same as Niagara-1.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The manual says that it is required and we actually have crash reports
where loads see stale data due to not having membars here.

In one case the networking does:

	memset(skb, 0, offsetof(struct sk_buff, truesize));

and then some code later checks skb->nohdr for zero, but it's still
the value that was there before the memset().

Note that arch/sparc64/lib/xor.S already got this right.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The bug that hit SUN4V TLB patching exists elsewhere.
Make sure we cure all such cases.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Happily we have no D-cache aliasing issues on these
chips, so the implementation is very straightforward.

Add a stub in bootup which will be where the patching
calls will be made for niagara/sun4v/hypervisor.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>