v4.19.13 snapshot.
diff --git a/include/linux/lockd/debug.h b/include/linux/lockd/debug.h
new file mode 100644
index 0000000..e536c57
--- /dev/null
+++ b/include/linux/lockd/debug.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/lockd/debug.h
+ *
+ * Debugging stuff.
+ *
+ * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef LINUX_LOCKD_DEBUG_H
+#define LINUX_LOCKD_DEBUG_H
+
+#ifdef __KERNEL__
+
+#include <linux/sunrpc/debug.h>
+
+/*
+ * Enable lockd debugging.
+ * Requires RPC_DEBUG.
+ */
+#undef ifdebug
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define ifdebug(flag) if (unlikely(nlm_debug & NLMDBG_##flag))
+#else
+# define ifdebug(flag) if (0)
+#endif
+
+#endif /* __KERNEL__ */
+
+/*
+ * Debug flags
+ */
+#define NLMDBG_SVC 0x0001
+#define NLMDBG_CLIENT 0x0002
+#define NLMDBG_CLNTLOCK 0x0004
+#define NLMDBG_SVCLOCK 0x0008
+#define NLMDBG_MONITOR 0x0010
+#define NLMDBG_CLNTSUBS 0x0020
+#define NLMDBG_SVCSUBS 0x0040
+#define NLMDBG_HOSTCACHE 0x0080
+#define NLMDBG_XDR 0x0100
+#define NLMDBG_ALL 0x7fff
+
+#endif /* LINUX_LOCKD_DEBUG_H */