From 447cd7a0d7d1e5b4486e99cce289654fec9951e3 Mon Sep 17 00:00:00 2001 From: Kirill Tkhai Date: Tue, 13 Feb 2018 12:26:44 +0300 Subject: net: Allow pernet_operations to be executed in parallel This adds new pernet_operations::async flag to indicate operations, which ->init(), ->exit() and ->exit_batch() methods are allowed to be executed in parallel with the methods of any other pernet_operations. When there are only asynchronous pernet_operations in the system, net_mutex won't be taken for a net construction and destruction. Also, remove BUG_ON(mutex_is_locked()) from net_assign_generic() without replacing with the equivalent net_sem check, as there is one more lockdep assert below. v3: Add comment near net_mutex. Suggested-by: Eric W. Biederman Signed-off-by: Kirill Tkhai Acked-by: Andrei Vagin Signed-off-by: David S. Miller --- include/net/net_namespace.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/net/net_namespace.h') diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index f306b2aa15a4..9158ec1ad06f 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -313,6 +313,12 @@ struct pernet_operations { void (*exit_batch)(struct list_head *net_exit_list); unsigned int *id; size_t size; + /* + * Indicates above methods are allowed to be executed in parallel + * with methods of any other pernet_operations, i.e. they are not + * need synchronization via net_mutex. + */ + bool async; }; /* -- cgit v1.2.3