tcp: use tcp_jiffies32 to feed probe_timestamp

Use tcp_jiffies32 instead of tcp_time_stamp, since
tcp_time_stamp will soon be only used for TCP TS option.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index cbda5de..f0fd1b4 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1475,7 +1475,7 @@
 	icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, net->ipv4.sysctl_tcp_base_mss);
 	icsk->icsk_mtup.probe_size = 0;
 	if (icsk->icsk_mtup.enabled)
-		icsk->icsk_mtup.probe_timestamp = tcp_time_stamp;
+		icsk->icsk_mtup.probe_timestamp = tcp_jiffies32;
 }
 EXPORT_SYMBOL(tcp_mtup_init);
 
@@ -1987,7 +1987,7 @@
 	s32 delta;
 
 	interval = net->ipv4.sysctl_tcp_probe_interval;
-	delta = tcp_time_stamp - icsk->icsk_mtup.probe_timestamp;
+	delta = tcp_jiffies32 - icsk->icsk_mtup.probe_timestamp;
 	if (unlikely(delta >= interval * HZ)) {
 		int mss = tcp_current_mss(sk);
 
@@ -1999,7 +1999,7 @@
 		icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);
 
 		/* Update probe time stamp */
-		icsk->icsk_mtup.probe_timestamp = tcp_time_stamp;
+		icsk->icsk_mtup.probe_timestamp = tcp_jiffies32;
 	}
 }