New NUMA scheduler and hotplug CPU

[Rusty Russell]

Hi Nick!

	Looking at your new scheduler in -mm, it uses cpu_online_map
alot in arch_init_sched_domains.  This means with hotplug CPU that it
would need to be modified: certainly possible to do, but messy.

	The other option is to use cpu_possible_map to create the full
topology up front, and then it need never change.  AFAICT, no other
changes are neccessary: you already check against moving tasks to
offline cpus.

Anyway, I was just porting the hotplug CPU patches over to -mm, and
came across this, so I thought I'd ask.

Thanks!
Rusty.
--
  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
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