tcp: mark tcp_congestion_ops read_mostly

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_yeah.c b/net/ipv4/tcp_yeah.c
index a0f2403..dc7f431 100644
--- a/net/ipv4/tcp_yeah.c
+++ b/net/ipv4/tcp_yeah.c
@@ -225,7 +225,7 @@
 	return tp->snd_cwnd - reduction;
 }
 
-static struct tcp_congestion_ops tcp_yeah = {
+static struct tcp_congestion_ops tcp_yeah __read_mostly = {
 	.flags		= TCP_CONG_RTT_STAMP,
 	.init		= tcp_yeah_init,
 	.ssthresh	= tcp_yeah_ssthresh,