kernel_setsockopt removed in cb8e59cc

[   13s] /home/abuild/rpmbuild/BUILD/drbd-9.0.24~1+git.17730ea3/default/drbd_transport_tcp.c: In function 'dtt_nodelay':
[   13s] /home/abuild/rpmbuild/BUILD/drbd-9.0.24~1+git.17730ea3/default/drbd_transport_tcp.c:158:9: error: implicit declaration of funct
ion 'kernel_setsockopt'; did you mean 'kernel_getsockname'? [-Werror=implicit-function-declaration]
[   13s]   158 |  (void) kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
[   13s]       |         ^~~~~~~~~~~~~~~~~                                                                                              [   13s]       |         kernel_getsockname
[   14s] cc1: some warnings being treated as errors

diff -Naur drbd-9.0.24~1+git.17730ea3.orig/drbd/drbd-kernel-compat/have_kernel_setsockopt.c drbd-9.0.24~1+git.17730ea3/drbd/drbd-kernel-compat/have_kernel_setsockopt.c
--- drbd-9.0.24~1+git.17730ea3.orig/drbd/drbd-kernel-compat/have_kernel_setsockopt.c	1970-01-01 08:00:00.000000000 +0800
+++ drbd-9.0.24~1+git.17730ea3/drbd/drbd-kernel-compat/have_kernel_setsockopt.c	2020-08-14 10:18:35.107901337 +0800
@@ -0,0 +1,13 @@
+#include <linux/socket.h>
+
+/*
+ * kernel_setsockopt removed in cb8e59cc
+*/
+
+void test(void)
+{
+	struct socket *sock;
+	int val = 1;
+
+	(void) kernel_setsockopt(sock, 0, 0, (char *)&val, sizeof(val));
+}
diff -Naur drbd-9.0.24~1+git.17730ea3.orig/drbd/drbd_transport_tcp.c drbd-9.0.24~1+git.17730ea3/drbd/drbd_transport_tcp.c
--- drbd-9.0.24~1+git.17730ea3.orig/drbd/drbd_transport_tcp.c	2020-08-14 10:15:16.122125660 +0800
+++ drbd-9.0.24~1+git.17730ea3/drbd/drbd_transport_tcp.c	2020-08-14 10:31:16.930382120 +0800
@@ -154,8 +154,12 @@
 
 static void dtt_nodelay(struct socket *socket)
 {
+#ifdef COMPAT_HAVE_KERNEL_SETSOCKOPT
 	int val = 1;
 	(void) kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
+#else
+	tcp_sock_set_nodelay(socket->sk);
+#endif
 }
 
 static int dtt_init(struct drbd_transport *transport)
@@ -889,7 +893,6 @@
 	struct socket *dsocket, *csocket;
 	struct net_conf *nc;
 	int timeout, err;
-	int one = 1;
 	bool ok;
 
 	dsocket = NULL;
@@ -1071,9 +1074,14 @@
 	dsocket->sk->sk_sndtimeo = timeout;
 	csocket->sk->sk_sndtimeo = timeout;
 
+#ifdef COMPAT_HAVE_KERNEL_SETSOCKOPT
+	int one = 1;
 	err = kernel_setsockopt(dsocket, SOL_SOCKET, SO_KEEPALIVE, (char *)&one, sizeof(one));
 	if (err)
 		tr_warn(transport, "Failed to enable SO_KEEPALIVE %d\n", err);
+#else
+	sock_set_keepalive(dsocket->sk);
+#endif
 
 	return 0;
 
@@ -1213,20 +1221,32 @@
 
 static void dtt_cork(struct socket *socket)
 {
+#ifdef COMPAT_HAVE_KERNEL_SETSOCKOPT
 	int val = 1;
 	(void) kernel_setsockopt(socket, SOL_TCP, TCP_CORK, (char *)&val, sizeof(val));
+#else
+	tcp_sock_set_cork(socket->sk, true);
+#endif
 }
 
 static void dtt_uncork(struct socket *socket)
 {
+#ifdef COMPAT_HAVE_KERNEL_SETSOCKOPT
 	int val = 0;
 	(void) kernel_setsockopt(socket, SOL_TCP, TCP_CORK, (char *)&val, sizeof(val));
+#else
+	tcp_sock_set_cork(socket->sk, false);
+#endif
 }
 
 static void dtt_quickack(struct socket *socket)
 {
+#ifdef COMPAT_HAVE_KERNEL_SETSOCKOPT
 	int val = 2;
 	(void) kernel_setsockopt(socket, SOL_TCP, TCP_QUICKACK, (char *)&val, sizeof(val));
+#else
+	tcp_sock_set_quickack(socket->sk, 2);
+#endif
 }
 
 static bool dtt_hint(struct drbd_transport *transport, enum drbd_stream stream,