diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index ce05271..3c696db 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -244,3 +244,15 @@
 {
 	return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
 }
+
+unsigned long long cpu_clock(int cpu)
+{
+	unsigned long long clock;
+	unsigned long flags;
+
+	raw_local_irq_save(flags);
+	clock = sched_clock_cpu(cpu);
+	raw_local_irq_restore(flags);
+
+	return clock;
+}