linux-kernel - Re: Crashes in arm qemu emulations due to 'cpufreq: governor: Replace timers with utilization ...'

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Message-ID: <20160215213606.GD19432@atomide.com>
Date:	Mon, 15 Feb 2016 13:36:07 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-next@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Crashes in arm qemu emulations due to 'cpufreq: governor:
 Replace timers with utilization ...'

* Rafael J. Wysocki <rafael@...nel.org> [160215 12:39]:
> On Mon, Feb 15, 2016 at 8:58 PM, Tony Lindgren <tony@...mide.com> wrote:
> > * Guenter Roeck <linux@...ck-us.net> [160215 11:41]:
> >> On 02/15/2016 11:01 AM, Tony Lindgren wrote:
> >> >
> >> >https://kernelci.org/boot/all/job/next/kernel/next-20160215/
> >> >
> >> >The SMP ones seem to fail with some regulator issues?
> >> >
> >>
> >> There is another problem, introduced with 6a0712f6f199e ("PM / OPP: Add
> >> dev_pm_opp_set_rate()"). The kernelci boot log for next-20160212:omap3-overo-tobi
> >> and others experience that problem.
> >>
> >> Essentially, the code now assumes that a CPU clock always has a voltage
> >> regulator attached to it, which is not correct. I sent out a patch to fix
> >> that problem a minute ago.
> >
> > Yes that fixed it thanks.
> 
> Can you please also check if this alternative fix from Viresh works:
> 
> https://patchwork.kernel.org/patch/8316611/

Yes that one too seems to fix the issue on SMP systems for
me:

Tested-by: Tony Lindgren <tony@...mide.com>

Regards,

Tony