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| author |   Kirill Tkhai <ktkhai@virtuozzo.com> | 2018-02-19 12:58:45 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-02-20 13:23:27 -0500 |
| commit | 65b7b5b90fcd17b25ef43b0cd02bda47bf286675 (patch) | |
| tree | b850ae90d607134d8e5dced4c0d5533abfd24a71 /net/core/net_namespace.c | |
| parent | net: Kill net_mutex (diff) | |
| download | linux-dev-65b7b5b90fcd17b25ef43b0cd02bda47bf286675.tar.xz linux-dev-65b7b5b90fcd17b25ef43b0cd02bda47bf286675.zip | |
net: Make cleanup_list and net::cleanup_list of llist type
This simplifies cleanup queueing and makes cleanup lists
to use llist primitives. Since llist has its own cmpxchg()
ordering, cleanup_list_lock is not more need.
Also, struct llist_node is smaller, than struct list_head,
so we save some bytes in struct net with this patch.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/net_namespace.c')
| -rw-r--r-- | net/core/net_namespace.c | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index e89a516620dd..abf8a46e94e2 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -481,21 +481,18 @@ static void unhash_nsid(struct net *net, struct net *last) spin_unlock_bh(&net->nsid_lock); } -static DEFINE_SPINLOCK(cleanup_list_lock); -static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */ +static LLIST_HEAD(cleanup_list); static void cleanup_net(struct work_struct *work) { const struct pernet_operations *ops; struct net *net, *tmp, *last; - struct list_head net_kill_list; + struct llist_node *net_kill_list; LIST_HEAD(net_exit_list); unsigned write; /* Atomically snapshot the list of namespaces to cleanup */ - spin_lock_irq(&cleanup_list_lock); - list_replace_init(&cleanup_list, &net_kill_list); - spin_unlock_irq(&cleanup_list_lock); + net_kill_list = llist_del_all(&cleanup_list); again: write = READ_ONCE(nr_sync_pernet_ops); if (write) @@ -510,7 +507,7 @@ again: /* Don't let anyone else find us. */ rtnl_lock(); - list_for_each_entry(net, &net_kill_list, cleanup_list) + llist_for_each_entry(net, net_kill_list, cleanup_list) list_del_rcu(&net->list); /* Cache last net. After we unlock rtnl, no one new net * added to net_namespace_list can assign nsid pointer @@ -525,7 +522,7 @@ again: last = list_last_entry(&net_namespace_list, struct net, list); rtnl_unlock(); - list_for_each_entry(net, &net_kill_list, cleanup_list) { + llist_for_each_entry(net, net_kill_list, cleanup_list) { unhash_nsid(net, last); list_add_tail(&net->exit_list, &net_exit_list); } @@ -585,12 +582,7 @@ static DECLARE_WORK(net_cleanup_work, cleanup_net); void __put_net(struct net *net) { /* Cleanup the network namespace in process context */ - unsigned long flags; - - spin_lock_irqsave(&cleanup_list_lock, flags); - list_add(&net->cleanup_list, &cleanup_list); - spin_unlock_irqrestore(&cleanup_list_lock, flags); - + llist_add(&net->cleanup_list, &cleanup_list); queue_work(netns_wq, &net_cleanup_work); } EXPORT_SYMBOL_GPL(__put_net); |