commit d9ff3049739e349b5380b96226f9ad766741773d
author Kirill Tkhai <ktkhai@virtuozzo.com> Thu Mar 22 12:45:40 2018 +0300
committer David S. Miller <davem@davemloft.net> Thu Mar 22 15:12:56 2018 -0400
tree 0b09f0de0ff410fef91ad0224a241b322bd0eb05
parent 5796ef75ec7b6019eac88f66751d663d537a5cd3

net: Replace ip_ra_lock with per-net mutex

Since ra_chain is per-net, we may use per-net mutexes
to protect them in ip_ra_control(). This improves
scalability.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/net_namespace.c

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index c340d5c..95ba2c5 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -301,6 +301,7 @@ static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
 	net->user_ns = user_ns;
 	idr_init(&net->netns_ids);
 	spin_lock_init(&net->nsid_lock);
+	mutex_init(&net->ipv4.ra_mutex);
 
 	list_for_each_entry(ops, &pernet_list, list) {
 		error = ops_init(ops, net);