diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index adf1893b161e..b032772bd144 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -7526,6 +7526,8 @@ 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;
 }