[PATCH 1/5] net/rds/sysctl.c: move sysctl-only code under CONFIG_SYSCTL

[Oleg Nesterov <oleg@redhat.com>]

Collect all code used only when CONFIG_SYSCTL=y into a single block and
wrap it in #ifdef CONFIG_SYSCTL. rds_sysctl_init() no longer needs the
IS_ENABLED() check.

Add the corresponding init/exit stubs for the CONFIG_SYSCTL=n case.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 net/rds/sysctl.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/net/rds/sysctl.c b/net/rds/sysctl.c
index 968d6279bbd3..47e8782b1aa3 100644
--- a/net/rds/sysctl.c
+++ b/net/rds/sysctl.c
@@ -36,11 +36,6 @@
 
 #include "rds.h"
 
-static struct ctl_table_header *rds_sysctl_reg_table;
-
-static unsigned long rds_sysctl_reconnect_min = 1;
-static unsigned long rds_sysctl_reconnect_max = ~0UL;
-
 unsigned long rds_sysctl_reconnect_min_jiffies;
 unsigned long rds_sysctl_reconnect_max_jiffies = HZ;
 
@@ -49,6 +44,10 @@ unsigned int  rds_sysctl_max_unacked_bytes = (16 << 20);
 
 unsigned int rds_sysctl_ping_enable = 1;
 
+#ifdef CONFIG_SYSCTL
+static unsigned long rds_sysctl_reconnect_min = 1;
+static unsigned long rds_sysctl_reconnect_max = ~0UL;
+
 static struct ctl_table rds_sysctl_rds_table[] = {
 	{
 		.procname       = "reconnect_min_delay_ms",
@@ -91,6 +90,8 @@ static struct ctl_table rds_sysctl_rds_table[] = {
 	},
 };
 
+static struct ctl_table_header *rds_sysctl_reg_table;
+
 void rds_sysctl_exit(void)
 {
 	unregister_net_sysctl_table(rds_sysctl_reg_table);
@@ -103,7 +104,20 @@ int rds_sysctl_init(void)
 
 	rds_sysctl_reg_table =
 		register_net_sysctl(&init_net, "net/rds", rds_sysctl_rds_table);
-	if (!rds_sysctl_reg_table && IS_ENABLED(CONFIG_SYSCTL))
+	if (!rds_sysctl_reg_table)
 		return -ENOMEM;
 	return 0;
 }
+
+#else
+
+int rds_sysctl_init(void)
+{
+	rds_sysctl_reconnect_min_jiffies = msecs_to_jiffies(1);
+	return 0;
+}
+
+void rds_sysctl_exit(void)
+{
+}
+#endif
-- 
2.55.0