Abolish per-CPU RTAS args

[Joel Schopp]

> So will you push it, or should I?  I shoud perhaps mention that it
> hasn't yet been tested on machine that actually has hotplug CPU...

I have such a machine.  I'll try to get to testing your patch with
hotplug CPU later this week.

>
> I do plan to merge the paca cleanup at some point.  This change lets
> me make the PACA cleanup more extensive, and get rid of some of the
> remaining cruft.

PACA cleanup! That would be great.


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