tcp: uses jiffies_32 to feed tp->chrono_start

tcp_time_stamp will no longer be tied to jiffies.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Acked-by: NSoheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp.c

@@ -2757,7 +2757,7 @@ static void tcp_get_info_chrono_stats(const struct tcp_sock *tp,
 	for (i = TCP_CHRONO_BUSY; i < __TCP_CHRONO_MAX; ++i) {
 		stats[i] = tp->chrono_stat[i - 1];
 		if (i == tp->chrono_type)
-			stats[i] += tcp_time_stamp - tp->chrono_start;
+			stats[i] += tcp_jiffies32 - tp->chrono_start;
 		stats[i] *= USEC_PER_SEC / HZ;
 		total += stats[i];
 	}

net/ipv4/tcp_output.c

@@ -2202,7 +2202,7 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb,
 
 static void tcp_chrono_set(struct tcp_sock *tp, const enum tcp_chrono new)
 {
-	const u32 now = tcp_time_stamp;
+	const u32 now = tcp_jiffies32;
 
 	if (tp->chrono_type > TCP_CHRONO_UNSPEC)
 		tp->chrono_stat[tp->chrono_type - 1] += now - tp->chrono_start;