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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 <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2015-07-27 23:11:44 +02:00
parent d9612a495b
commit 4d1f3a5bcb
1 changed files with 5 additions and 5 deletions
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8
drivers/cpufreq/cpufreq.c
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@ -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 */
if (!recover_policy) {
/* related_cpus should at least include 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)
/* 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