nohz: Fix update_ts_time_stat idle accounting

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / time / tick-sched.c

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index d5097c44b407e25a1acae0f5d85c520eda555ae5..7ab44bca6546f3f1a374def64369454e6e4cc923 100644 (file)
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -159,9 +159,10 @@ update_ts_time_stats(int cpu, struct tick_sched *ts, ktime_t now, u64 *last_upda
 
        if (ts->idle_active) {
                delta = ktime_sub(now, ts->idle_entrytime);
-               ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
                if (nr_iowait_cpu(cpu) > 0)
                        ts->iowait_sleeptime = ktime_add(ts->iowait_sleeptime, delta);
+               else
+                       ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
                ts->idle_entrytime = now;
        }
 
@@ -200,8 +201,7 @@ static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)
  * @last_update_time: variable to store update time in
  *
  * Return the cummulative idle time (since boot) for a given
- * CPU, in microseconds. The idle time returned includes
- * the iowait time (unlike what "top" and co report).
+ * CPU, in microseconds.
  *
  * This time is measured via accounting rather than sampling,
  * and is as accurate as ktime_get() is.
@@ -221,7 +221,7 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
 }
 EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
 
-/*
+/**
  * get_cpu_iowait_time_us - get the total iowait time of a cpu
  * @cpu: CPU number to query
  * @last_update_time: variable to store update time in