1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SCHED_RT_H
3 #define _LINUX_SCHED_RT_H
4 
5 #include <linux/sched.h>
6 
7 struct task_struct;
8 
rt_prio(int prio)9 static inline int rt_prio(int prio)
10 {
11 	if (unlikely(prio < MAX_RT_PRIO))
12 		return 1;
13 	return 0;
14 }
15 
rt_task(struct task_struct * p)16 static inline int rt_task(struct task_struct *p)
17 {
18 	return rt_prio(p->prio);
19 }
20 
task_is_realtime(struct task_struct * tsk)21 static inline bool task_is_realtime(struct task_struct *tsk)
22 {
23 	int policy = tsk->policy;
24 
25 	if (policy == SCHED_FIFO || policy == SCHED_RR)
26 		return true;
27 	if (policy == SCHED_DEADLINE)
28 		return true;
29 	return false;
30 }
31 
32 #ifdef CONFIG_RT_MUTEXES
33 /*
34  * Must hold either p->pi_lock or task_rq(p)->lock.
35  */
rt_mutex_get_top_task(struct task_struct * p)36 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *p)
37 {
38 	return p->pi_top_task;
39 }
40 extern void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task);
41 extern void rt_mutex_adjust_pi(struct task_struct *p);
tsk_is_pi_blocked(struct task_struct * tsk)42 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
43 {
44 	return tsk->pi_blocked_on != NULL;
45 }
46 #else
rt_mutex_get_top_task(struct task_struct * task)47 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *task)
48 {
49 	return NULL;
50 }
51 # define rt_mutex_adjust_pi(p)		do { } while (0)
tsk_is_pi_blocked(struct task_struct * tsk)52 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
53 {
54 	return false;
55 }
56 #endif
57 
58 extern void normalize_rt_tasks(void);
59 
60 
61 /*
62  * default timeslice is 100 msecs (used only for SCHED_RR tasks).
63  * Timeslices get refilled after they expire.
64  */
65 #define RR_TIMESLICE		(100 * HZ / 1000)
66 
67 #endif /* _LINUX_SCHED_RT_H */
68