RE: [PATCHSET percpu#for-next] percpu: convert ia64 to dynamicpercpu and drop the old one, take#2

[Luck, Tony]

> Tony: Could we use a global register for the per cpu address? That would
> make IA64 work similar to sparc.

Would that be a useful trade of resources for convenience?  We've already
hard-wired r13 for "current". Grabbing another one would require fixing
(since user code will have clobbered it).  Possibly re-working any existing
code that already uses whatever register you choose.

How would that compare with using [r13]?

We might have a krN free ... but kregs are a lot slower than real registers.

-Tony
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