Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/net/netns/xdp.h b/include/net/netns/xdp.h
new file mode 100644
index 0000000..e573426
--- /dev/null
+++ b/include/net/netns/xdp.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NETNS_XDP_H__
+#define __NETNS_XDP_H__
+
+#include <linux/rculist.h>
+#include <linux/mutex.h>
+
+struct netns_xdp {
+	struct mutex		lock;
+	struct hlist_head	list;
+};
+
+#endif /* __NETNS_XDP_H__ */