1 files changed, 22 insertions, 0 deletions
diff --git a/kernel/watchdog_perf.c b/kernel/watchdog_perf.c
index 75af12ff774e..9c58f5b4381d 100644
--- a/kernel/watchdog_perf.c
+++ b/kernel/watchdog_perf.c
@@ -187,6 +187,28 @@ void watchdog_hardlockup_disable(unsigned int cpu)
 }
 
 /**
+ * hardlockup_detector_perf_adjust_period - Adjust the event period due
+ *                                          to current cpu frequency change
+ * @period: The target period to be set
+ */
+void hardlockup_detector_perf_adjust_period(u64 period)
+{
+	struct perf_event *event = this_cpu_read(watchdog_ev);
+
+	if (!(watchdog_enabled & WATCHDOG_HARDLOCKUP_ENABLED))
+		return;
+
+	if (!event)
+		return;
+
+	if (event->attr.sample_period == period)
+		return;
+
+	if (perf_event_period(event, period))
+		pr_err("failed to change period to %llu\n", period);
+}
+
+/**
  * hardlockup_detector_perf_stop - Globally stop watchdog events
  *
  * Special interface for x86 to handle the perf HT bug.