linux-kernel - Re: perf code using smp_processor_id() in preemptible [00000000] code

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Message-ID: <20131115101946.GG1754@moon>
Date:	Fri, 15 Nov 2013 14:19:46 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: perf code using smp_processor_id() in preemptible [00000000] code

On Fri, Nov 15, 2013 at 11:02:54AM +0100, Peter Zijlstra wrote:
> On Thu, Nov 14, 2013 at 10:29:07PM -0500, Dave Jones wrote:
> > BUG: using smp_processor_id() in preemptible [00000000] code: trinity-main/890
> > caller is p4_pmu_schedule_events+0x25/0x4c0
> 
> Whee, wherever did you dig up that dinosaur ;-)

rofl ;)
> 
> Hrmm, I'm not entire sure what we should do here; Cyrill, do you have clue?

We need figure out which cpu we're scheduled on to properly choose thread.
I have a vague memory that earlier I've raw_smp_processor_id here but then
someone pointed that we need smp_processor_id instead. Gimme some time,
I'll cook a patch today.

Thanks for report, Dave!
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