linux-kernel - [PATCH v4 13/15] sched/deadline: Move some utility functions to deadline.h

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Message-ID: <20260116123911.130300-14-gmonaco@redhat.com>
Date: Fri, 16 Jan 2026 13:39:09 +0100
From: Gabriele Monaco <gmonaco@...hat.com>
To: linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Nam Cao <namcao@...utronix.de>,
	Juri Lelli <jlelli@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc: Gabriele Monaco <gmonaco@...hat.com>,
	Tomas Glozar <tglozar@...hat.com>,
	Clark Williams <williams@...hat.com>,
	John Kacur <jkacur@...hat.com>,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH v4 13/15] sched/deadline: Move some utility functions to deadline.h

Some utility functions on sched_dl_entity can be useful outside of
deadline.c , for instance for modelling, without relying on raw
structure fields.

Move functions like pi_of, is_dl_boosted, dl_is_implicit to deadline.h
to make them available outside.

Signed-off-by: Gabriele Monaco <gmonaco@...hat.com>
---
 include/linux/sched/deadline.h | 51 ++++++++++++++++++++++++++++++++++
 kernel/sched/deadline.c        | 50 +--------------------------------
 2 files changed, 52 insertions(+), 49 deletions(-)

diff --git a/include/linux/sched/deadline.h b/include/linux/sched/deadline.h
index c40115d4e34d..9468a9b1090c 100644
--- a/include/linux/sched/deadline.h
+++ b/include/linux/sched/deadline.h
@@ -37,4 +37,55 @@ extern void dl_clear_root_domain_cpu(int cpu);
 extern u64 dl_cookie;
 extern bool dl_bw_visited(int cpu, u64 cookie);
 
+extern struct rv_monitor rv_deadline;
+
+static bool dl_server(struct sched_dl_entity *dl_se)
+{
+	return dl_se->dl_server;
+}
+
+static inline struct task_struct *dl_task_of(struct sched_dl_entity *dl_se)
+{
+	BUG_ON(dl_server(dl_se));
+	return container_of(dl_se, struct task_struct, dl);
+}
+
+#ifdef CONFIG_RT_MUTEXES
+static inline struct sched_dl_entity *pi_of(struct sched_dl_entity *dl_se)
+{
+	return dl_se->pi_se;
+}
+
+static inline bool is_dl_boosted(struct sched_dl_entity *dl_se)
+{
+	return pi_of(dl_se) != dl_se;
+}
+#else /* !CONFIG_RT_MUTEXES: */
+static inline struct sched_dl_entity *pi_of(struct sched_dl_entity *dl_se)
+{
+	return dl_se;
+}
+
+static inline bool is_dl_boosted(struct sched_dl_entity *dl_se)
+{
+	return false;
+}
+#endif /* !CONFIG_RT_MUTEXES */
+
+/*
+ * Regarding the deadline, a task with implicit deadline has a relative
+ * deadline == relative period. A task with constrained deadline has a
+ * relative deadline <= relative period.
+ *
+ * We support constrained deadline tasks. However, there are some restrictions
+ * applied only for tasks which do not have an implicit deadline. See
+ * update_dl_entity() to know more about such restrictions.
+ *
+ * The dl_is_implicit() returns true if the task has an implicit deadline.
+ */
+static inline bool dl_is_implicit(struct sched_dl_entity *dl_se)
+{
+	return dl_se->dl_deadline == dl_se->dl_period;
+}
+
 #endif /* _LINUX_SCHED_DEADLINE_H */
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index a69d2f073916..3b4647575fa6 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -18,6 +18,7 @@
 
 #include <linux/cpuset.h>
 #include <linux/sched/clock.h>
+#include <linux/sched/deadline.h>
 #include <uapi/linux/sched/types.h>
 #include "sched.h"
 #include "pelt.h"
@@ -57,17 +58,6 @@ static int __init sched_dl_sysctl_init(void)
 late_initcall(sched_dl_sysctl_init);
 #endif /* CONFIG_SYSCTL */
 
-static bool dl_server(struct sched_dl_entity *dl_se)
-{
-	return dl_se->dl_server;
-}
-
-static inline struct task_struct *dl_task_of(struct sched_dl_entity *dl_se)
-{
-	BUG_ON(dl_server(dl_se));
-	return container_of(dl_se, struct task_struct, dl);
-}
-
 static inline struct rq *rq_of_dl_rq(struct dl_rq *dl_rq)
 {
 	return container_of(dl_rq, struct rq, dl);
@@ -93,28 +83,6 @@ static inline int on_dl_rq(struct sched_dl_entity *dl_se)
 	return !RB_EMPTY_NODE(&dl_se->rb_node);
 }
 
-#ifdef CONFIG_RT_MUTEXES
-static inline struct sched_dl_entity *pi_of(struct sched_dl_entity *dl_se)
-{
-	return dl_se->pi_se;
-}
-
-static inline bool is_dl_boosted(struct sched_dl_entity *dl_se)
-{
-	return pi_of(dl_se) != dl_se;
-}
-#else /* !CONFIG_RT_MUTEXES: */
-static inline struct sched_dl_entity *pi_of(struct sched_dl_entity *dl_se)
-{
-	return dl_se;
-}
-
-static inline bool is_dl_boosted(struct sched_dl_entity *dl_se)
-{
-	return false;
-}
-#endif /* !CONFIG_RT_MUTEXES */
-
 static inline struct dl_bw *dl_bw_of(int i)
 {
 	RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),
@@ -979,22 +947,6 @@ update_dl_revised_wakeup(struct sched_dl_entity *dl_se, struct rq *rq)
 	dl_se->runtime = (dl_se->dl_density * laxity) >> BW_SHIFT;
 }
 
-/*
- * Regarding the deadline, a task with implicit deadline has a relative
- * deadline == relative period. A task with constrained deadline has a
- * relative deadline <= relative period.
- *
- * We support constrained deadline tasks. However, there are some restrictions
- * applied only for tasks which do not have an implicit deadline. See
- * update_dl_entity() to know more about such restrictions.
- *
- * The dl_is_implicit() returns true if the task has an implicit deadline.
- */
-static inline bool dl_is_implicit(struct sched_dl_entity *dl_se)
-{
-	return dl_se->dl_deadline == dl_se->dl_period;
-}
-
 /*
  * When a deadline entity is placed in the runqueue, its runtime and deadline
  * might need to be updated. This is done by a CBS wake up rule. There are two
-- 
2.52.0