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 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 */ 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); 42 static inline bool tsk_is_pi_blocked(struct task_struct *tsk) 43 { 44 return tsk->pi_blocked_on != NULL; 45 } 46 #else 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) 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