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 9 static inline int rt_prio(int prio) 10 { 11 if (unlikely(prio < MAX_RT_PRIO)) 12 return 1; 13 return 0; 14 } 15 16 static inline int rt_task(struct task_struct *p) 17 { 18 return rt_prio(p->prio); 19 } 20 21 #ifdef CONFIG_RT_MUTEXES 22 /* 23 * Must hold either p->pi_lock or task_rq(p)->lock. 24 */ 25 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *p) 26 { 27 return p->pi_top_task; 28 } 29 extern void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task); 30 extern void rt_mutex_adjust_pi(struct task_struct *p); 31 static inline bool tsk_is_pi_blocked(struct task_struct *tsk) 32 { 33 return tsk->pi_blocked_on != NULL; 34 } 35 #else 36 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *task) 37 { 38 return NULL; 39 } 40 # define rt_mutex_adjust_pi(p) do { } while (0) 41 static inline bool tsk_is_pi_blocked(struct task_struct *tsk) 42 { 43 return false; 44 } 45 #endif 46 47 extern void normalize_rt_tasks(void); 48 49 50 /* 51 * default timeslice is 100 msecs (used only for SCHED_RR tasks). 52 * Timeslices get refilled after they expire. 53 */ 54 #define RR_TIMESLICE (100 * HZ / 1000) 55 56 #endif /* _LINUX_SCHED_RT_H */ 57