eeh

[Nathan Fontenot]

Just wanted to put out an updated version the eeh patch, one that
I can push to Ameslab.  I hope.  Thanks to everyone for their
help in working on this code.

This patch updates a few things.

- The need for rpaphp to be built into the kernel is gone.  Code
was added to let rpaphp register a mechanism with eeh to do the
disabling of the slot.

- The disable_slot routine is back to static.  As Greg pointed
out, having a routine called disable_slot become a global symbol
become a global symbol is not a good idea.  Especially since this
is a very arch specific routine.

-Instances of __pa() are replaced with virt_to_phys()

-Moves the slot_errbuf and slot_errbuf_lock off of the stack.

As always, all comments are welcome.  thanks.

-Nathan F.
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