diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index c614375cd264..33cf83b9bda8 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -223,6 +223,7 @@ srcu_read_lock_notrace(struct srcu_struct *ssp) __acquires(ssp)
 static inline void srcu_read_unlock(struct srcu_struct *ssp, int idx)
 	__releases(ssp)
 {
+	WARN_ON_ONCE(idx & ~0x1);
 	rcu_lock_release(&(ssp)->dep_map);
 	__srcu_read_unlock(ssp, idx);
 }