latencytop: move sysctl to its own file

This moves latencytop sysctl to kernel/latencytop.c

Signed-off-by: liaohua <[e-mail]>
Signed-off-by: Luis Chamberlain <[e-mail]>

include/linux/latencytop.h

···
 
 void clear_tsk_latency_tracing(struct task_struct *p);
 
-int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
-		size_t *lenp, loff_t *ppos);
-
 #else
 
 static inline void

kernel/latencytop.c

···
 #include <linux/sched/stat.h>
 #include <linux/list.h>
 #include <linux/stacktrace.h>
+#include <linux/sysctl.h>
 
 static DEFINE_RAW_SPINLOCK(latency_lock);
 
···
 static struct latency_record latency_record[MAXLR];
 
 int latencytop_enabled;
+
+#ifdef CONFIG_SYSCTL
+static int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
+		size_t *lenp, loff_t *ppos)
+{
+	int err;
+
+	err = proc_dointvec(table, write, buffer, lenp, ppos);
+	if (latencytop_enabled)
+		force_schedstat_enabled();
+
+	return err;
+}
+
+static struct ctl_table latencytop_sysctl[] = {
+	{
+		.procname   = "latencytop",
+		.data       = &latencytop_enabled,
+		.maxlen     = sizeof(int),
+		.mode       = 0644,
+		.proc_handler   = sysctl_latencytop,
+	},
+	{}
+};
+#endif
 
 void clear_tsk_latency_tracing(struct task_struct *p)
 {
···
 static int __init init_lstats_procfs(void)
 {
 	proc_create("latency_stats", 0644, NULL, &lstats_proc_ops);
+#ifdef CONFIG_SYSCTL
+	register_sysctl_init("kernel", latencytop_sysctl);
+#endif
 	return 0;
-}
-
-int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
-		size_t *lenp, loff_t *ppos)
-{
-	int err;
-
-	err = proc_dointvec(table, write, buffer, lenp, ppos);
-	if (latencytop_enabled)
-		force_schedstat_enabled();
-
-	return err;
 }
 device_initcall(init_lstats_procfs);

kernel/sysctl.c

···
 #include <linux/kexec.h>
 #include <linux/mount.h>
 #include <linux/userfaultfd_k.h>
-#include <linux/latencytop.h>
 #include <linux/pid.h>
 
 #include "../lib/kstrtox.h"
···
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_NEG_ONE,
 		.extra2		= SYSCTL_ONE,
-	},
-#endif
-#ifdef CONFIG_LATENCYTOP
-	{
-		.procname	= "latencytop",
-		.data		= &latencytop_enabled,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= sysctl_latencytop,
 	},
 #endif
 	{