Abolish per-CPU RTAS args

[Anton Blanchard]

Hi David,

> Currently we store RTAS arguments in the PACA.  The args have to be in
> the RMO, but since we have a global spinlock for RTAS anyway, there's
> no reason to have a separate copy of the args per-CPU.  This patch
> replaces the PACA field with a single instance in the global rtas
> structure.

I like it :) Any plans to merge your paca cleanup too?

Anton

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