linux-kernel - Re: [PATCH V5 1/2] topology: Allow multiple entities to provide sched_freq

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Message-ID: <20210309091900.GA27747@willie-the-truck>
Date:   Tue, 9 Mar 2021 09:19:00 +0000
From:   Will Deacon <will@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>,
        Catalin Marinas <catalin.marinas@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ionela Voinescu <ionela.voinescu@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 1/2] topology: Allow multiple entities to provide
 sched_freq_tick() callback

On Tue, Mar 09, 2021 at 09:46:43AM +0530, Viresh Kumar wrote:
> On 08-03-21, 14:52, Will Deacon wrote:
> > On Mon, Mar 01, 2021 at 12:21:17PM +0530, Viresh Kumar wrote:
> > > +EXPORT_SYMBOL_GPL(topology_set_scale_freq_source);
> > 
> > I don't get why you need to export this in this patch. The arm64 topology
> > code is never built as a module.
> > 
> > > +EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source);
> > 
> > Same here.
> > 
> > > +EXPORT_SYMBOL_GPL(freq_scale);
> > 
> > And here.
> 
> After this patch, any part of the kernel can use these
> helpers/variables to run their own implementation of tick-freq-scale
> and so this patch looked to be the right place for that to me.
> 
> And the second patch in the series updates the CPPC cpufreq driver
> (tristate) to use these exported symbols, so we have the first user
> who needs the exported symbols as well.

Ok, then how about putting the exports in their own patch that immediately
precedes the patch which uses them? I think that would make it much clearer.

> > This one probably wants a less generic name as well if it's going
> > to be exported.
> 
> x86 names it arch_freq_scale, perhaps we should stick to that instead.

Sounds like a improvement, thanks.

Will