diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 26b57e24476f19ee9409ee4f90463b9afa7036b0..f3768f326981d0ecab1c9a39df60950f2723373c 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -3605,6 +3605,9 @@ static int __lock_downgrade(struct lockdep_map *lock, unsigned long ip)
 	unsigned int depth;
 	int i;
 
+	if (unlikely(!debug_locks))
+		return 0;
+
 	depth = curr->lockdep_depth;
 	/*
 	 * This function is about (re)setting the class of a held lock,