linux-kernel - [PATCH v5 13/15] sched/deadline: Move some utility functions to deadline.h

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Message-ID: <20260122155500.362683-14-gmonaco@redhat.com>
Date: Thu, 22 Jan 2026 16:54:58 +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 v5 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 dl_task_of and dl_is_implicit to deadline.h to make
them available outside.

Signed-off-by: Gabriele Monaco <gmonaco@...hat.com>
---

Notes:
    V5:
    * Do not export pi_of to deadline.h
    * Explicitly inline dl_server()

 include/linux/sched/deadline.h | 29 +++++++++++++++++++++++++++++
 kernel/sched/deadline.c        | 28 +---------------------------
 2 files changed, 30 insertions(+), 27 deletions(-)

diff --git a/include/linux/sched/deadline.h b/include/linux/sched/deadline.h
index c40115d4e34d..d25a5dc2c5cb 100644
--- a/include/linux/sched/deadline.h
+++ b/include/linux/sched/deadline.h
@@ -37,4 +37,33 @@ 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 inline 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);
+}
+
+/*
+ * 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..08158dbc21a8 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);
@@ -979,22 +969,6 @@ 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