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From"Luck, Tony" <>
DateTue, 15 Jul 2008 13:10:14 -0700
SubjectRE: [PATCH 00/14] Introduce cpu_enabled_map and friends
> 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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