linux-kernel - [PATCH RFC 10/25] net: Move sysctl_pernet_ops to pernet

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Date:   Fri, 17 Nov 2017 21:28:53 +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,
        roman.kapl@...go.com, paul@...l-moore.com, dsahern@...il.com,
        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 10/25] net: Move sysctl_pernet_ops to pernet_sys list

This patch starts to convert pernet_subsys, registered
from core initcalls.

Since net/socket.o is the first linked file in net/Makefile,
its core initcalls execute the first. sysctl_pernet_ops is
the first pernet_subsys, registered from sock_init(), so
it goes ahead of others, registered via core_initcall().

Methods sysctl_net_init() and sysctl_net_exit() initialize
net::sysctls of a namespace.

pernet_operations::init()/exit() methods from the rest
of the list do not touch net::sysctls of strangers,
so it's safe to execute sysctl_pernet_ops's methods
in parallel with any other pernet_operations.

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

diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 9aed6fe1bf1a..1b91db88e54a 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -103,7 +103,7 @@ __init int net_sysctl_init(void)
 	net_header = register_sysctl("net", empty);
 	if (!net_header)
 		goto out;
-	ret = register_pernet_subsys(&sysctl_pernet_ops);
+	ret = register_pernet_sys(&sysctl_pernet_ops);
 	if (ret)
 		goto out1;
 out: