linux-kernel - Re: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update

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Date:	Mon, 01 Aug 2016 18:30:27 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Doug Smythies <dsmythies@...us.net>
Cc:	'Linux PM list' <linux-pm@...r.kernel.org>,
	'Peter Zijlstra' <peterz@...radead.org>,
	'Srinivas Pandruvada' <srinivas.pandruvada@...ux.intel.com>,
	'Viresh Kumar' <viresh.kumar@...aro.org>,
	'Linux Kernel Mailing List' <linux-kernel@...r.kernel.org>,
	'Steve Muckle' <steve.muckle@...aro.org>,
	'Juri Lelli' <juri.lelli@....com>,
	'Ingo Molnar' <mingo@...nel.org>
Subject: Re: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting

On Monday, August 01, 2016 08:26:54 AM Doug Smythies wrote:
> On 2016.07.31 16:32 Rafael J. Wysocki wrote:
> 
> > Hi,
> >
> > Admittedly, this hasn't been tested yet, so no promises and you have been
> > warned.  It builds, though (on x86-64 at least).
> 
> It would not build for me until I changed the kernel configuration file like so:
> 
> $ scripts/diffconfig .config .config_rjw_b_2
>  CPU_FREQ_GOV_SCHEDUTIL m -> y
> 
> (the above is actually backwards, it is "y" that works.)
> 
> Otherwise I got:
> 
> Kernel: arch/x86/boot/bzImage is ready  (#86)
>   MODPOST 3318 modules
> ERROR: "dl_bw_cpus" [kernel/sched/cpufreq_schedutil.ko] undefined!
> ERROR: "dl_bw_of" [kernel/sched/cpufreq_schedutil.ko] undefined!
> ERROR: "runqueues" [kernel/sched/cpufreq_schedutil.ko] undefined!
> scripts/Makefile.modpost:91: recipe for target '__modpost' failed
> make[4]: *** [__modpost] Error 1
> Makefile:1186: recipe for target 'modules' failed

There are some export_symbol declarations missing, I'll fix that up.

Thanks,
Rafael