cpufreq: schedutil: Fix per-CPU structure initialization in sugov_start()

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+

1 files changed, 7 insertions, 13 deletions

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index cd7cd489f739..54c577578da6 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -584,20 +584,14 @@ 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;
 }