sched/deadline: Collect sched_dl_entity initialization

Create a single function that initializes a sched_dl_entity.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Phil Auld <pauld@redhat.com>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lkml.kernel.org/r/51acc695eecf0a1a2f78f9a044e11ffd9b316bcf.1699095159.git.bristot@kernel.org

Author: Peter Zijlstra

kernel/sched/core.c

@@ -4511,10 +4511,7 @@ static void __sched_fork(unsigned long clone_flags, struct task_struct *p)
 	memset(&p->stats, 0, sizeof(p->stats));
 #endif
 
-	RB_CLEAR_NODE(&p->dl.rb_node);
-	init_dl_task_timer(&p->dl);
-	init_dl_inactive_task_timer(&p->dl);
-	__dl_clear_params(p);
+	init_dl_entity(&p->dl);
 
 	INIT_LIST_HEAD(&p->rt.run_list);
 	p->rt.timeout		= 0;

kernel/sched/deadline.c

@@ -335,6 +335,8 @@ static void dl_change_utilization(struct task_struct *p, u64 new_bw)
 	__add_rq_bw(new_bw, &rq->dl);
 }
 
+static void __dl_clear_params(struct sched_dl_entity *dl_se);
+
 /*
  * The utilization of a task cannot be immediately removed from
  * the rq active utilization (running_bw) when the task blocks.
@@ -434,7 +436,7 @@ static void task_non_contending(struct task_struct *p)
 			raw_spin_lock(&dl_b->lock);
 			__dl_sub(dl_b, p->dl.dl_bw, dl_bw_cpus(task_cpu(p)));
 			raw_spin_unlock(&dl_b->lock);
-			__dl_clear_params(p);
+			__dl_clear_params(dl_se);
 		}
 
 		return;
@@ -1183,7 +1185,7 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer *timer)
 	return HRTIMER_NORESTART;
 }
 
-void init_dl_task_timer(struct sched_dl_entity *dl_se)
+static void init_dl_task_timer(struct sched_dl_entity *dl_se)
 {
 	struct hrtimer *timer = &dl_se->dl_timer;
 
@@ -1389,7 +1391,7 @@ static enum hrtimer_restart inactive_task_timer(struct hrtimer *timer)
 		raw_spin_lock(&dl_b->lock);
 		__dl_sub(dl_b, p->dl.dl_bw, dl_bw_cpus(task_cpu(p)));
 		raw_spin_unlock(&dl_b->lock);
-		__dl_clear_params(p);
+		__dl_clear_params(dl_se);
 
 		goto unlock;
 	}
@@ -1405,7 +1407,7 @@ static enum hrtimer_restart inactive_task_timer(struct hrtimer *timer)
 	return HRTIMER_NORESTART;
 }
 
-void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se)
+static void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se)
 {
 	struct hrtimer *timer = &dl_se->inactive_timer;
 
@@ -2957,10 +2959,8 @@ bool __checkparam_dl(const struct sched_attr *attr)
 /*
  * This function clears the sched_dl_entity static params.
  */
-void __dl_clear_params(struct task_struct *p)
+static void __dl_clear_params(struct sched_dl_entity *dl_se)
 {
-	struct sched_dl_entity *dl_se = &p->dl;
-
 	dl_se->dl_runtime		= 0;
 	dl_se->dl_deadline		= 0;
 	dl_se->dl_period		= 0;
@@ -2978,6 +2978,14 @@ void __dl_clear_params(struct task_struct *p)
 #endif
 }
 
+void init_dl_entity(struct sched_dl_entity *dl_se)
+{
+	RB_CLEAR_NODE(&dl_se->rb_node);
+	init_dl_task_timer(dl_se);
+	init_dl_inactive_task_timer(dl_se);
+	__dl_clear_params(dl_se);
+}
+
 bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr)
 {
 	struct sched_dl_entity *dl_se = &p->dl;

kernel/sched/sched.h

@@ -273,8 +273,6 @@ struct rt_bandwidth {
 	unsigned int		rt_period_active;
 };
 
-void __dl_clear_params(struct task_struct *p);
-
 static inline int dl_bandwidth_enabled(void)
 {
 	return sysctl_sched_rt_runtime >= 0;
@@ -2427,8 +2425,7 @@ extern struct rt_bandwidth def_rt_bandwidth;
 extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
 extern bool sched_rt_bandwidth_account(struct rt_rq *rt_rq);
 
-extern void init_dl_task_timer(struct sched_dl_entity *dl_se);
-extern void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se);
+extern void init_dl_entity(struct sched_dl_entity *dl_se);
 
 #define BW_SHIFT		20
 #define BW_UNIT			(1 << BW_SHIFT)