tcp: Namespace-ify sysctl_tcp_nometrics_save

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 0ab78ab..0507b56 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -20,8 +20,6 @@
 #include <net/tcp.h>
 #include <net/genetlink.h>
 
-int sysctl_tcp_nometrics_save __read_mostly;
-
 static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *saddr,
 						   const struct inetpeer_addr *daddr,
 						   struct net *net, unsigned int hash);
@@ -330,7 +328,7 @@ void tcp_update_metrics(struct sock *sk)
 	int m;
 
 	sk_dst_confirm(sk);
-	if (sysctl_tcp_nometrics_save || !dst)
+	if (net->ipv4.sysctl_tcp_nometrics_save || !dst)
 		return;
 
 	rcu_read_lock();