Re: [PATCH] idr: Use this_cpu_ptr() for percpu_ida

From: Christoph Lameter
Date: Thu Aug 08 2013 - 10:46:52 EST

On Wed, 7 Aug 2013, Kent Overstreet wrote:

> One thing that was bugging me - I was never able to figure out for sure
> if smp_processor_id() returns a number in the range [0, nr_cpu_ids), at
> least I couldn't find where it was documented - could you tell me if
> that's true?

I always assumed that it was in the range 0 ... nr_cpu_ids - 1 and that is
the assumption under which the kernel code was written. Things would break
horribly if smp_process_id would return nr_cpu_ids or higher.

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