On Friday, July 22, 2016 08:36:56 AM Viresh Kumar wrote:
> On 22-07-16, 17:14, Andreas Herrmann wrote:
> > diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c
> > index a7ecb9a..3f0ce2a 100644
> > --- a/drivers/cpufreq/pcc-cpufreq.c
> > +++ b/drivers/cpufreq/pcc-cpufreq.c
> > @@ -555,8 +555,6 @@ static int pcc_cpufreq_cpu_init(struct cpufreq_policy *policy)
> > policy->min = policy->cpuinfo.min_freq =
> > ioread32(&pcch_hdr->minimum_frequency) * 1000;
> >
> > - policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
> > -
> > pr_debug("init: policy->max is %d, policy->min is %d\n",
> > policy->max, policy->min);
> > out:
>
> Hi Rafael,
>
> I am very confused on this, can you help me understand ?
>
> - CPUFREQ_ETERNAL = -1
> - unsigned int transition_latency = CPUFREQ_ETERNAL, will set it to UINT_MAX.
> - Many drivers do it today
>
> cpufreq.c
>
> if (policy->governor->max_transition_latency &&
> policy->cpuinfo.transition_latency >
> policy->governor->max_transition_latency) {
>
> - And this check will always fail, unless max_transition_latency is zero.
Why would it fail? If governor->max_transition_latency is non-zero, but less
than UNIT_MAX, the condition checked will be true to my eyes.
Thanks,
Rafael
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