From 6f1b2a04fed74a7eb82cc2db6563c61bd0896eba Mon Sep 17 00:00:00 2001
From: Kostas Peletidis <kostas@peletidis.net>
Date: Sun, 11 Nov 2018 22:37:45 +0000
Subject: [PATCH] Export tcp_send_ack symbol to fix build issue with
 mptcp_fullmesh module (mptcp_trunk). This commit should make it possible to
 revert 64a80850.

---
 net/ipv4/tcp_output.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 8e19cff002d52..a7782b71e8ebc 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3702,6 +3702,7 @@ void tcp_send_ack(struct sock *sk)
 {
 	__tcp_send_ack(sk, tcp_sk(sk)->rcv_nxt);
 }
+EXPORT_SYMBOL_GPL(tcp_send_ack);
 
 /* This routine sends a packet with an out of date sequence
  * number. It assumes the other end will try to ack it.