[PATCH] sched: move uclamp_util sysctls to core.c

[Zhen Ni]

move uclamp_util sysctls to core.c and use the new
register_sysctl_init() to register the sysctl interface.

Signed-off-by: Zhen Ni <nizhen@xxxxxxxxxxxxx>
---
 include/linux/sched/sysctl.h |  8 -------
 kernel/sched/core.c          | 43 ++++++++++++++++++++++++++++++++----
 kernel/sysctl.c              | 23 -------------------
 3 files changed, 39 insertions(+), 35 deletions(-)

diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index c19dd5a2c05c..1f07d14cf9fc 100644
--- a/include/linux/sched/sysctl.h
+++ b/include/linux/sched/sysctl.h
@@ -35,12 +35,6 @@ extern int sysctl_sched_rt_runtime;
 extern unsigned int sysctl_sched_dl_period_max;
 extern unsigned int sysctl_sched_dl_period_min;
 
-#ifdef CONFIG_UCLAMP_TASK
-extern unsigned int sysctl_sched_uclamp_util_min;
-extern unsigned int sysctl_sched_uclamp_util_max;
-extern unsigned int sysctl_sched_uclamp_util_min_rt_default;
-#endif
-
 #ifdef CONFIG_CFS_BANDWIDTH
 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
 #endif
@@ -56,8 +50,6 @@ int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
 		size_t *lenp, loff_t *ppos);
 int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
 		size_t *lenp, loff_t *ppos);
-int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
-		void *buffer, size_t *lenp, loff_t *ppos);
 int sysctl_numa_balancing(struct ctl_table *table, int write, void *buffer,
 		size_t *lenp, loff_t *ppos);
 int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 848eaa0efe0e..1962111416e4 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1254,10 +1254,10 @@ static void set_load_weight(struct task_struct *p, bool update_load)
 static DEFINE_MUTEX(uclamp_mutex);
 
 /* Max allowed minimum utilization */
-unsigned int sysctl_sched_uclamp_util_min = SCHED_CAPACITY_SCALE;
+static unsigned int sysctl_sched_uclamp_util_min = SCHED_CAPACITY_SCALE;
 
 /* Max allowed maximum utilization */
-unsigned int sysctl_sched_uclamp_util_max = SCHED_CAPACITY_SCALE;
+static unsigned int sysctl_sched_uclamp_util_max = SCHED_CAPACITY_SCALE;
 
 /*
  * By default RT tasks run at the maximum performance point/capacity of the
@@ -1274,7 +1274,7 @@ unsigned int sysctl_sched_uclamp_util_max = SCHED_CAPACITY_SCALE;
  * This knob will not override the system default sched_util_clamp_min defined
  * above.
  */
-unsigned int sysctl_sched_uclamp_util_min_rt_default = SCHED_CAPACITY_SCALE;
+static unsigned int sysctl_sched_uclamp_util_min_rt_default = SCHED_CAPACITY_SCALE;
 
 /* All clamps are required to be less or equal than these values */
 static struct uclamp_se uclamp_default[UCLAMP_CNT];
@@ -1727,7 +1727,7 @@ static void uclamp_update_root_tg(void)
 static void uclamp_update_root_tg(void) { }
 #endif
 
-int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
+static int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
 				void *buffer, size_t *lenp, loff_t *ppos)
 {
 	bool update_root_tg = false;
@@ -1792,6 +1792,40 @@ int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
 	return result;
 }
 
+#ifdef CONFIG_SYSCTL
+static struct ctl_table sched_uclamp_util_sysctls[] = {
+	{
+		.procname       = "sched_util_clamp_min",
+		.data           = &sysctl_sched_uclamp_util_min,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = sysctl_sched_uclamp_handler,
+	},
+	{
+		.procname       = "sched_util_clamp_max",
+		.data           = &sysctl_sched_uclamp_util_max,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = sysctl_sched_uclamp_handler,
+	},
+	{
+		.procname       = "sched_util_clamp_min_rt_default",
+		.data           = &sysctl_sched_uclamp_util_min_rt_default,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = sysctl_sched_uclamp_handler,
+	},
+	{}
+};
+
+static void __init sched_uclamp_sysctl_init(void)
+{
+	register_sysctl_init("kernel", sched_uclamp_util_sysctls);
+}
+#else
+#define sched_uclamp_sysctl_init() do { } while (0)
+#endif
+
 static int uclamp_validate(struct task_struct *p,
 			   const struct sched_attr *attr)
 {
@@ -1955,6 +1989,7 @@ static void __init init_uclamp(void)
 		root_task_group.uclamp[clamp_id] = uc_max;
 #endif
 	}
+	sched_uclamp_sysctl_init();
 }
 
 #else /* CONFIG_UCLAMP_TASK */
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 5ae443b2882e..78996c0c8852 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1727,29 +1727,6 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= sched_rr_handler,
 	},
-#ifdef CONFIG_UCLAMP_TASK
-	{
-		.procname	= "sched_util_clamp_min",
-		.data		= &sysctl_sched_uclamp_util_min,
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= sysctl_sched_uclamp_handler,
-	},
-	{
-		.procname	= "sched_util_clamp_max",
-		.data		= &sysctl_sched_uclamp_util_max,
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= sysctl_sched_uclamp_handler,
-	},
-	{
-		.procname	= "sched_util_clamp_min_rt_default",
-		.data		= &sysctl_sched_uclamp_util_min_rt_default,
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= sysctl_sched_uclamp_handler,
-	},
-#endif
 #ifdef CONFIG_SCHED_AUTOGROUP
 	{
 		.procname	= "sched_autogroup_enabled",
-- 
2.20.1