net: sysctl: use shared sysctl macro

This patch replace two, four and long_one to SYSCTL_XXX.

Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: David Ahern <dsahern@kernel.org>
Cc: Simon Horman <horms@verge.net.au>
Cc: Julian Anastasov <ja@ssi.bg>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@netfilter.org>
Cc: Florian Westphal <fw@strlen.de>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Lorenz Bauer <lmb@cloudflare.com>
Cc: Akhmat Karakotov <hmukos@yandex-team.ru>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

net/core/sysctl_net_core.c

@@ -25,13 +25,11 @@
 
 #include "dev.h"
 
-static int two = 2;
 static int three = 3;
 static int int_3600 = 3600;
 static int min_sndbuf = SOCK_MIN_SNDBUF;
 static int min_rcvbuf = SOCK_MIN_RCVBUF;
 static int max_skb_frags = MAX_SKB_FRAGS;
-static long long_one __maybe_unused = 1;
 static long long_max __maybe_unused = LONG_MAX;
 
 static int net_msg_warn;	/* Unused, but still a sysctl */
@@ -390,7 +388,7 @@ static struct ctl_table net_core_table[] = {
 		.extra2		= SYSCTL_ONE,
 # else
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 # endif
 	},
 # ifdef CONFIG_HAVE_EBPF_JIT
@@ -401,7 +399,7 @@ static struct ctl_table net_core_table[] = {
 		.mode		= 0600,
 		.proc_handler	= proc_dointvec_minmax_bpf_restricted,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 	},
 	{
 		.procname	= "bpf_jit_kallsyms",
@@ -419,7 +417,7 @@ static struct ctl_table net_core_table[] = {
 		.maxlen		= sizeof(long),
 		.mode		= 0600,
 		.proc_handler	= proc_dolongvec_minmax_bpf_restricted,
-		.extra1		= &long_one,
+		.extra1		= SYSCTL_LONG_ONE,
 		.extra2		= &bpf_jit_limit_max,
 	},
 #endif
@@ -546,7 +544,7 @@ static struct ctl_table net_core_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 	},
 	{
 		.procname	= "devconf_inherit_init_net",

net/ipv4/sysctl_net_ipv4.c

@@ -20,10 +20,7 @@
 #include <net/protocol.h>
 #include <net/netevent.h>
 
-static int two = 2;
 static int three __maybe_unused = 3;
-static int four = 4;
-static int thousand = 1000;
 static int tcp_retr1_max = 255;
 static int ip_local_port_range_min[] = { 1, 1 };
 static int ip_local_port_range_max[] = { 65535, 65535 };
@@ -1006,7 +1003,7 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 	},
 	{
 		.procname	= "tcp_max_syn_backlog",
@@ -1117,7 +1114,7 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &four,
+		.extra2		= SYSCTL_FOUR,
 	},
 	{
 		.procname	= "tcp_recovery",
@@ -1310,7 +1307,7 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &thousand,
+		.extra2		= SYSCTL_ONE_THOUSAND,
 	},
 	{
 		.procname	= "tcp_pacing_ca_ratio",
@@ -1319,7 +1316,7 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &thousand,
+		.extra2		= SYSCTL_ONE_THOUSAND,
 	},
 	{
 		.procname	= "tcp_wmem",
@@ -1391,7 +1388,7 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 	},
 	{ }
 };

net/ipv6/sysctl_net_ipv6.c

@@ -23,7 +23,6 @@
 #endif
 #include <linux/ioam6.h>
 
-static int two = 2;
 static int three = 3;
 static int flowlabel_reflect_max = 0x7;
 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
@@ -197,7 +196,7 @@ static struct ctl_table ipv6_table_template[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1         = SYSCTL_ZERO,
-		.extra2         = &two,
+		.extra2         = SYSCTL_TWO,
 	},
 	{
 		.procname	= "ioam6_id",