--- zzzz-none-000/linux-4.1.52/include/linux/ipv6.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/linux/ipv6.h	2022-03-02 11:37:13.000000000 +0000
@@ -310,12 +310,14 @@
 	return NULL;
 }
 
+#if !defined(CONFIG_BCM_MPTCP) || !defined(CONFIG_BCM_KF_MPTCP)
 static inline struct inet6_request_sock *
 			inet6_rsk(const struct request_sock *rsk)
 {
 	return NULL;
 }
 
+#endif
 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 {
 	return NULL;