--- a/backport-include/linux/firmware.h
+++ b/backport-include/linux/firmware.h
@@ -5,5 +5,16 @@
 #if LINUX_VERSION_IS_LESS(3,14,0)
 #define request_firmware_direct(fw, name, device) request_firmware(fw, name, device)
 #endif
+#if LINUX_VERSION_IS_LESS(4,18,0)
+#define firmware_request_nowarn(fw, name, device) request_firmware(fw, name, device)
+#endif
+
+#if LINUX_VERSION_IS_LESS(4,17,0)
+#define firmware_request_cache LINUX_BACKPORT(firmware_request_cache)
+static inline int firmware_request_cache(struct device *device, const char *name)
+{
+	return 0;
+}
+#endif
 
 #endif /* __BACKPORT_LINUX_FIRMWARE_H */
