From: Lukasz Luba lukasz.luba@arm.com
[ Upstream commit 93d9e6f93e1586fcc97498c764be2e8c8401f4bd ]
The thermal pressure signal gives information to the scheduler about reduced CPU capacity due to thermal. It is based on a value stored in a per-cpu 'thermal_pressure' variable. The online CPUs will get the new value there, while the offline won't. Unfortunately, when the CPU is back online, the value read from per-cpu variable might be wrong (stale data). This might affect the scheduler decisions, since it sees the CPU capacity differently than what is actually available.
Fix it by making sure that all online+offline CPUs would get the proper value in their per-cpu variable when there is throttling or throttling is removed.
Fixes: 275157b367f479 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support") Reviewed-by: Thara Gopinath thara.gopinath@linaro.org Signed-off-by: Lukasz Luba lukasz.luba@arm.com Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/cpufreq/qcom-cpufreq-hw.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index a2be0df7e1747..0138b2ec406dc 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -304,7 +304,8 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) if (capacity > max_capacity) capacity = max_capacity;
- arch_set_thermal_pressure(policy->cpus, max_capacity - capacity); + arch_set_thermal_pressure(policy->related_cpus, + max_capacity - capacity);
/* * In the unlikely case policy is unregistered do not enable