Re: [PATCH] percpu: fix unit_map[] verification inpcpu_setup_first_chunk()

[Christoph Lameter]

On Tue, 29 Sep 2009, Tejun Heo wrote:

>
> Christoph, can you please elaborate why nr_cpu_ids < NR_CPUS is
> broken?

If its just an internal number that becomes larger than NR_CPUS then
everything is fine.

But if a real cpu id (returned by smp_processor_id()) gets larger than
NR_CPUS then we get into trouble with the parts of the kernel that index
by cpu id.

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