diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 61992cf..cf3342a 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -566,8 +566,12 @@
 	struct perf_event_context	*task_ctx;
 	int				active_oncpu;
 	int				exclusive;
+
+	raw_spinlock_t			hrtimer_lock;
 	struct hrtimer			hrtimer;
 	ktime_t				hrtimer_interval;
+	unsigned int			hrtimer_active;
+
 	struct pmu			*unique_pmu;
 	struct perf_cgroup		*cgrp;
 };