cpufreq_policy_transition_delay_us
EXPORT_SYMBOL_GPL(cpufreq_policy_transition_delay_us);
cpufreq_policy_transition_delay_us(policy));
unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
tunables->rate_limit_us = cpufreq_policy_transition_delay_us(policy);