v4.19.13 snapshot.
diff --git a/net/wireless/sysfs.h b/net/wireless/sysfs.h
new file mode 100644
index 0000000..7b454c2
--- /dev/null
+++ b/net/wireless/sysfs.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __WIRELESS_SYSFS_H
+#define __WIRELESS_SYSFS_H
+
+int wiphy_sysfs_init(void);
+void wiphy_sysfs_exit(void);
+
+extern struct class ieee80211_class;
+
+#endif /* __WIRELESS_SYSFS_H */