RAS uses RTAS arguments that might be above RMO/4GB

[Olof Johansson]

The EPOW stuff in ras.c passes pointers from the stack into RTAS.
There's a risk that they end up above 4GB and/or above RMO, which makes
RTAS choke. We're seeing a couple of these at the moment, so I'd like to
fix this to rule it out.

Does attached patch look sane?  I'm not 100% sure what context it might
be called from, but I figured doing local structure copies is safer than
holding the lock over log_error().


Thanks.

-Olof

--
Olof Johansson                                        Office: 4F005/905
Linux on Power Development                            IBM Systems Group
Email: olof at austin.ibm.com                          Phone: 512-838-9858
All opinions are my own and not those of IBM
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