diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index f3b6ac232e21..4da8a5e702f8 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5893,6 +5893,8 @@ notrace void wq_watchdog_touch(int cpu)
 {
 	if (cpu >= 0)
 		per_cpu(wq_watchdog_touched_cpu, cpu) = jiffies;
+	else
+		WARN_ONCE(1, "%s should be called with valid CPU", __func__);
 
 	wq_watchdog_touched = jiffies;
 }