--- zzzz-none-000/linux-4.9.218/net/ipv6/ndisc.c	2020-04-02 15:20:41.000000000 +0000
+++ seale-7590ac-750/linux-4.9.218/net/ipv6/ndisc.c	2022-11-30 09:46:20.000000000 +0000
@@ -278,6 +278,7 @@
 	}
 	return ndopts;
 }
+EXPORT_SYMBOL(ndisc_parse_options);
 
 int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
 {