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Subject[PATCH 1/2] sched/rt: Add a helper to test for a RT task
Date
This helper returns true if a task has elevated priority which is true
for RT tasks (SCHED_RR and SCHED_FIFO) and also for SCHED_DEADLINE.
A task which runs at RT priority due to PI-boosting is not considered as
one with elevated priority.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/sched/rt.h | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/include/linux/sched/rt.h b/include/linux/sched/rt.h
index f93329aba31a..30a86b8178f8 100644
--- a/include/linux/sched/rt.h
+++ b/include/linux/sched/rt.h
@@ -17,6 +17,17 @@ static inline int rt_task(struct task_struct *p)
return rt_prio(p->prio);
}

+static inline bool task_is_elevated(struct task_struct *tsk)
+{
+ int policy = tsk->policy;
+
+ if (policy == SCHED_FIFO || policy == SCHED_RR)
+ return true;
+ if (policy == SCHED_DEADLINE)
+ return true;
+ return false;
+}
+
#ifdef CONFIG_RT_MUTEXES
/*
* Must hold either p->pi_lock or task_rq(p)->lock.
--
2.14.2
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