To leverage the auto-tuning improvements brought by commit 2da35e4b4df9
("Merge branch 'tcp-receive-side-improvements'"), the MPTCP stack need
to access the mentioned helper.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 include/net/tcp.h    | 1 +
 net/ipv4/tcp_input.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 2936b8175950f..8298029f2d0f7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -346,6 +346,7 @@ void tcp_delack_timer_handler(struct sock *sk);
 int tcp_ioctl(struct sock *sk, int cmd, int *karg);
 enum skb_drop_reason tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb);
 void tcp_rcv_established(struct sock *sk, struct sk_buff *skb);
+void tcp_rcvbuf_grow(struct sock *sk);
 void tcp_rcv_space_adjust(struct sock *sk);
 int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
 void tcp_twsk_destructor(struct sock *sk);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index a52a747d8a55e..f9f5705390430 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -744,7 +744,7 @@ static inline void tcp_rcv_rtt_measure_ts(struct sock *sk,
 	}
 }
 
-static void tcp_rcvbuf_grow(struct sock *sk)
+void tcp_rcvbuf_grow(struct sock *sk)
 {
 	const struct net *net = sock_net(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
-- 
2.51.0