linux-kernel - [PATCH RFC 18/25] net: Move uevent_net_ops to pernet

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Date:   Fri, 17 Nov 2017 21:30:07 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     davem@...emloft.net, vyasevic@...hat.com,
        kstewart@...uxfoundation.org, pombredanne@...b.com,
        vyasevich@...il.com, mark.rutland@....com,
        gregkh@...uxfoundation.org, adobriyan@...il.com, fw@...len.de,
        nicolas.dichtel@...nd.com, xiyou.wangcong@...il.com,
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        daniel@...earbox.net, lucien.xin@...il.com,
        mschiffer@...verse-factory.net, rshearma@...cade.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        ktkhai@...tuozzo.com, ebiederm@...ssion.com, avagin@...tuozzo.com,
        gorcunov@...tuozzo.com, eric.dumazet@...il.com,
        stephen@...workplumber.org, ktkhai@...tuozzo.com
Subject: [PATCH RFC 18/25] net: Move uevent_net_ops to pernet_sys list

This postcore_initcall() created pernet_operations
are registered from ./lib directory, and they have
to go right after audit_net_ops.

uevent_net_init() and uevent_net_exit() create and
destroy netlink socket, and these actions serialized
in netlink code.

Parallel execution with other pernet_operations
makes the socket disappear earlier from uevent_sock_list
on ->exit. As userspace can't be interested in broadcast
messages of dying net, and, as I see, no one in kernel
listen them, we may safely move uevent_net_ops to pernet_sys
list.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 lib/kobject_uevent.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index c3e84edc47c9..84c9d85477cc 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -647,7 +647,7 @@ static struct pernet_operations uevent_net_ops = {
 
 static int __init kobject_uevent_init(void)
 {
-	return register_pernet_subsys(&uevent_net_ops);
+	return register_pernet_sys(&uevent_net_ops);
 }