RE: [PATCH 00/14] Introduce cpu_enabled_map and friends

[Luck, Tony]

> Patch 14 is the money patch. It demonstrates why we might
> want to go through all these gyrations. Now that ia64 presents
> *all* physically present CPUs in sysfs, even if they have been
> disabled by firmware, we give userspace a way to poke at those
> CPUs.

There's only the one bit for "disabled by firmware" ... no extra
space for any extra information.  How would userspace know that
it was safe to poke at a disabled cpu?  Perhaps firmware disabled
it for some very good reason, and poking at it could cause system
instability.

-Tony
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