v4.19.13 snapshot.
diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h
new file mode 100644
index 0000000..f6aeed0
--- /dev/null
+++ b/include/linux/sunrpc/debug.h
@@ -0,0 +1,130 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/debug.h
+ *
+ * Debugging support for sunrpc module
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+#ifndef _LINUX_SUNRPC_DEBUG_H_
+#define _LINUX_SUNRPC_DEBUG_H_
+
+#include <uapi/linux/sunrpc/debug.h>
+
+/*
+ * Debugging macros etc
+ */
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+extern unsigned int rpc_debug;
+extern unsigned int nfs_debug;
+extern unsigned int nfsd_debug;
+extern unsigned int nlm_debug;
+#endif
+
+#define dprintk(fmt, ...) \
+ dfprintk(FACILITY, fmt, ##__VA_ARGS__)
+#define dprintk_cont(fmt, ...) \
+ dfprintk_cont(FACILITY, fmt, ##__VA_ARGS__)
+#define dprintk_rcu(fmt, ...) \
+ dfprintk_rcu(FACILITY, fmt, ##__VA_ARGS__)
+#define dprintk_rcu_cont(fmt, ...) \
+ dfprintk_rcu_cont(FACILITY, fmt, ##__VA_ARGS__)
+
+#undef ifdebug
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define ifdebug(fac) if (unlikely(rpc_debug & RPCDBG_##fac))
+
+# define dfprintk(fac, fmt, ...) \
+do { \
+ ifdebug(fac) \
+ printk(KERN_DEFAULT fmt, ##__VA_ARGS__); \
+} while (0)
+
+# define dfprintk_cont(fac, fmt, ...) \
+do { \
+ ifdebug(fac) \
+ printk(KERN_CONT fmt, ##__VA_ARGS__); \
+} while (0)
+
+# define dfprintk_rcu(fac, fmt, ...) \
+do { \
+ ifdebug(fac) { \
+ rcu_read_lock(); \
+ printk(KERN_DEFAULT fmt, ##__VA_ARGS__); \
+ rcu_read_unlock(); \
+ } \
+} while (0)
+
+# define dfprintk_rcu_cont(fac, fmt, ...) \
+do { \
+ ifdebug(fac) { \
+ rcu_read_lock(); \
+ printk(KERN_CONT fmt, ##__VA_ARGS__); \
+ rcu_read_unlock(); \
+ } \
+} while (0)
+
+# define RPC_IFDEBUG(x) x
+#else
+# define ifdebug(fac) if (0)
+# define dfprintk(fac, fmt, ...) do {} while (0)
+# define dfprintk_cont(fac, fmt, ...) do {} while (0)
+# define dfprintk_rcu(fac, fmt, ...) do {} while (0)
+# define RPC_IFDEBUG(x)
+#endif
+
+/*
+ * Sysctl interface for RPC debugging
+ */
+
+struct rpc_clnt;
+struct rpc_xprt;
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+void rpc_register_sysctl(void);
+void rpc_unregister_sysctl(void);
+void sunrpc_debugfs_init(void);
+void sunrpc_debugfs_exit(void);
+void rpc_clnt_debugfs_register(struct rpc_clnt *);
+void rpc_clnt_debugfs_unregister(struct rpc_clnt *);
+void rpc_xprt_debugfs_register(struct rpc_xprt *);
+void rpc_xprt_debugfs_unregister(struct rpc_xprt *);
+#else
+static inline void
+sunrpc_debugfs_init(void)
+{
+ return;
+}
+
+static inline void
+sunrpc_debugfs_exit(void)
+{
+ return;
+}
+
+static inline void
+rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
+{
+ return;
+}
+
+static inline void
+rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt)
+{
+ return;
+}
+
+static inline void
+rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
+{
+ return;
+}
+
+static inline void
+rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
+{
+ return;
+}
+#endif
+
+#endif /* _LINUX_SUNRPC_DEBUG_H_ */