netdev - [PATCH v1 net 12/16] tcp: Mark sysctl_tcp_low

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Date:   Tue, 5 Jul 2022 22:21:26 -0700
From:   Kuniyuki Iwashima <kuniyu@...zon.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>
CC:     Kuniyuki Iwashima <kuniyu@...zon.com>,
        Kuniyuki Iwashima <kuni1840@...il.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 net 12/16] tcp: Mark sysctl_tcp_low_latency obsolete.

Since commit b2fb4f54ecd4 ("tcp: uninline tcp_prequeue()"),
sysctl_tcp_low_latency is no longer used.  However, to mark
it safe and finally remove proc_dointvec(), this patch changes
handler to a lockless variant.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 net/ipv4/sysctl_net_ipv4.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index b14931ca5c85..0287d55f9230 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -507,11 +507,12 @@ static struct ctl_table ipv4_table[] = {
 		.proc_handler	= proc_doulongvec_minmax_lockless,
 	},
 	{
+		/* obsolete */
 		.procname	= "tcp_low_latency",
 		.data		= &sysctl_tcp_low_latency,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dointvec_lockless,
 	},
 #ifdef CONFIG_NETLABEL
 	{
-- 
2.30.2