linux-kernel - Re: [PATCH] idr: Use this_cpu_ptr() for percpu

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Date:	Thu, 8 Aug 2013 14:32:05 +0000
From:	Christoph Lameter <cl@...two.org>
To:	Kent Overstreet <kmo@...erainc.com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, Jens Axboe <axboe@...nel.dk>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Subject: Re: [PATCH] idr: Use this_cpu_ptr() for percpu_ida

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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