Re: [PATCH] x86 performance counters driver 3.0-pre2 for 2.5.44: [2/4] x86 support

[Andi Kleen]

> For what values of cpu is per_cpu(var,cpu) valid? For those where
> cpu_online(cpu) is true, or those where cpu_possible(cpu) is true?
> (I need to convert a memset() on the per_cpu_cache[] array to the
> per_cpu(,) framework.)

Currently for cpu_possible(), but there is a patchkit around that
makes it only true for cpu_online() so better assume that. 
Of course that would require a hotplug CPU handler, but I would
just ignore that for now.

-Andi