Re: [PATCH v3 5/7] cpufreq: add function to get the hardware max frequency

[Valentin Schneider]

On 2/11/20 6:45 PM, Ionela Voinescu wrote:
> +/**
> + * cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU
> + * @cpu: CPU number
> + *
> + * The default return value is the max_freq field of cpuinfo.
> + */
> +__weak unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
> +{
> +	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
> +	unsigned int ret_freq = 0;
> +
> +	if (policy) {
> +		ret_freq = policy->cpuinfo.max_freq;
> +		cpufreq_cpu_put(policy);

What about intel_pstate / turbo stuff? IIRC one of Giovanni's issues was that
turbo freq is not always reported as the max freq. Dunno if we can do
anything about it; at the very least maybe document the caveat?

> +	}
> +
> +	return ret_freq;
> +}
> +EXPORT_SYMBOL(cpufreq_get_hw_max_freq);
> +
>  static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
>  {
>  	if (unlikely(policy_is_inactive(policy)))