From: Geliang Tang <tanggeliang@kylinos.cn>

Extract a do_tcp_splice_eof() helper from tcp_splice_eof() and export it to
net/tcp.h, so that it can be used in MPTCP.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 include/net/tcp.h | 1 +
 net/ipv4/tcp.c    | 8 ++++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index f87bdacb5a69..af2e4b61bf23 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -370,6 +370,7 @@ int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
 int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size);
 int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg, int *copied,
 			 size_t size, struct ubuf_info *uarg);
+void do_tcp_splice_eof(struct sock *sk);
 void tcp_splice_eof(struct socket *sock);
 int tcp_send_mss(struct sock *sk, int *size_goal, int flags);
 int tcp_wmem_schedule(struct sock *sk, int copy);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index dfd677c689ef..2ffad80c1c28 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1469,9 +1469,8 @@ int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 }
 EXPORT_SYMBOL(tcp_sendmsg);
 
-void tcp_splice_eof(struct socket *sock)
+void do_tcp_splice_eof(struct sock *sk)
 {
-	struct sock *sk = sock->sk;
 	struct tcp_sock *tp = tcp_sk(sk);
 	int mss_now, size_goal;
 
@@ -1483,6 +1482,11 @@ void tcp_splice_eof(struct socket *sock)
 	tcp_push(sk, 0, mss_now, tp->nonagle, size_goal);
 	release_sock(sk);
 }
+
+void tcp_splice_eof(struct socket *sock)
+{
+	do_tcp_splice_eof(sock->sk);
+}
 EXPORT_IPV6_MOD_GPL(tcp_splice_eof);
 
 /*
-- 
2.53.0