[rfc] where to put cpuid_t ?

[Adrian Chadd]

Hi!

I've been chipping away at a cpuid_t in a local branch for a while and
I think I have the very basics working well enough.

However, the most annoying thing that's crept up is the most bikeshed
topic of them all - where should it live.

I'd like to avoid having to include sys/pcpu.h or sys/_cpuset.h just
for the id type - it seems a bit overkill.

So - suggestions? Otherwise I'm going to leave it in sys/pcpu.h and
just polluate appropriately.

I'd like to try and get cpuid_t and a handful of KBI-changing things
into -HEAD before 11 is branched so we at least have a hope of trying
to support > 128 CPUs out of the box in the immediate future and > 253
CPUs in the later future.


-a