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[for-4.9,2/2] cpufreq: schedutil: Fix per-CPU structure initialization in sugov_start()

Message ID 1495734984-26879-2-git-send-email-amit.pundir@linaro.org
State New
Headers show
Series [for-4.9,1/2] cpufreq: schedutil: move cached_raw_freq to struct sugov_policy | expand

Commit Message

Amit Pundir May 25, 2017, 5:56 p.m. UTC 
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>


commit 4296f23ed49a15d36949458adcc66ff993dee2a8 upstream.

sugov_start() only initializes struct sugov_cpu per-CPU structures
for shared policies, but it should do that for single-CPU policies too.

That in particular makes the IO-wait boost mechanism work in the
cases when cpufreq policies correspond to individual CPUs.

Fixes: 21ca6d2c52f8 (cpufreq: schedutil: Add iowait boosting)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

Cc: 4.9+ <stable@vger.kernel.org> # 4.9+
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

---
 kernel/sched/cpufreq_schedutil.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

-- 
2.7.4
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Patch

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index 6415c04be3f8..cb771c76682e 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -507,20 +507,14 @@  static int sugov_start(struct cpufreq_policy *policy)
 	for_each_cpu(cpu, policy->cpus) {
 		struct sugov_cpu *sg_cpu = &per_cpu(sugov_cpu, cpu);
 
+		memset(sg_cpu, 0, sizeof(*sg_cpu));
 		sg_cpu->sg_policy = sg_policy;
-		if (policy_is_shared(policy)) {
-			sg_cpu->util = 0;
-			sg_cpu->max = 0;
-			sg_cpu->flags = SCHED_CPUFREQ_RT;
-			sg_cpu->last_update = 0;
-			sg_cpu->iowait_boost = 0;
-			sg_cpu->iowait_boost_max = policy->cpuinfo.max_freq;
-			cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util,
-						     sugov_update_shared);
-		} else {
-			cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util,
-						     sugov_update_single);
-		}
+		sg_cpu->flags = SCHED_CPUFREQ_RT;
+		sg_cpu->iowait_boost_max = policy->cpuinfo.max_freq;
+		cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util,
+					     policy_is_shared(policy) ?
+							sugov_update_shared :
+							sugov_update_single);
 	}
 	return 0;
 }