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From: Steve Muckle <steve.muckle@linaro.org>
X-Google-Original-From: Steve Muckle <smuckle@linaro.org>
Date: Tue, 31 May 2016 11:12:53 -0700
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Steve Muckle <steve.muckle@linaro.org>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, Vincent Guittot <vincent.guittot@linaro.org>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Juri Lelli <Juri.Lelli@arm.com>,
        Patrick Bellasi <patrick.bellasi@arm.com>,
        Michael Turquette <mturquette@baylibre.com>
Subject: Re: [PATCH v2 1/3] cpufreq: add resolve_freq driver callback
Message-ID: <20160531181253.GI9864@graphite.smuckle.net>
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 <20160531111451.GF9463@vireshk-i7>
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On Tue, May 31, 2016 at 04:44:51PM +0530, Viresh Kumar wrote:
> On 25-05-16, 19:52, Steve Muckle wrote:
> > +unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
> > +					 unsigned int target_freq)
> > +{
> > +	struct cpufreq_frequency_table *freq_table;
> > +	int index, retval;
> > +
> > +	clamp_val(target_freq, policy->min, policy->max);
> 
> Rafael will kill me for this, as I have fallen into the same trap and
> copied your *incorrect* code :(
> 
> This is a useless statement unless you do:
> 
> target_freq = clamp_val(target_freq, policy->min, policy->max);

Well I wouldn't worry too much, I copied it from Rafael's code in
cpufreq_driver_fast_switch() which also has this problem and needs to be
fixed.

Perhaps clamp_val could be changed to force the compiler to check that
its return value is being used.

thanks,
Steve