From: Rafael J. Wysocki Date: Mon, 27 Jul 2015 21:11:44 +0000 (+0200) Subject: cpufreq: Do not update related_cpus on every policy activation X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=4d1f3a5bcb489cc6f7cbc128e0c292fed7868d32;p=openwrt%2Fstaging%2Fblogic.git cpufreq: Do not update related_cpus on every policy activation The related_cpus mask includes CPUs whose cpufreq_cpu_data per-CPU pointers have been set the the given policy. Since those pointers are only set at the policy creation time and unset when the policy is deleted, the related_cpus should not be updated between those two operations. For this reason, avoid updating it whenever the first of the "related" CPUs goes online. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 9d8f8cd64e58..0ea4bb723760 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1251,12 +1251,12 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) down_write(&policy->rwsem); - /* related cpus should atleast have policy->cpus */ - cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); - - /* Remember which CPUs have been present at the policy creation time. */ - if (!recover_policy) + if (!recover_policy) { + /* related_cpus should at least include policy->cpus. */ + cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); + /* Remember CPUs present at the policy creation time. */ cpumask_and(policy->real_cpus, policy->cpus, cpu_present_mask); + } /* * affected cpus must always be the one, which are online. We aren't