Subject: Re: [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state

From: Michael Ellerman <[email-masked]>
Date: Tue, 08 Nov 2016 11:21:23 +1100

Denis Kirjanov <[email-masked]> writes:
> On 11/7/16, Michael Ellerman <[email-masked]> wrote:
>> Denis Kirjanov <[email-masked]> writes:
>>>     [   67.700897] BUG: using smp_processor_id() in preemptible [00000000] code: cat/7343
>>>     [   67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
>>
>> When did this break?
>
> I think that problem exists since commit
> 09a972d1620934142d30cfda455ffe429af751c4 ("cpufreq: powernv: Report
> cpu frequency throttling") but I can be wrong

Yep that looks right to me, thanks.

Gautham, how bad is the bug here, do we want to send this to stable?

cheers