19 static inline int __normal_prio(int policy, int rt_prio, int nice)  in __normal_prio()  argument
23 	if (dl_policy(policy))  in __normal_prio()
25 	else if (rt_policy(policy))  in __normal_prio()
42 	return __normal_prio(p->policy, p->rt_priority, PRIO_TO_NICE(p->static_prio));  in normal_prio()
164  * sched policy         return value   kernel prio    user prio/nice
264  * sched_setparam() passes in -1 for its policy, to let the functions  in DEFINE_CLASS()
272 	int policy = attr->sched_policy;  in DEFINE_CLASS()  local
274 	if (policy == SETPARAM_POLICY)  in DEFINE_CLASS()
275 		policy = p->policy;  in DEFINE_CLASS()
277 	p->policy = policy;  in DEFINE_CLASS()
279 	if (dl_policy(policy))  in DEFINE_CLASS()
281 	else if (fair_policy(policy))  in DEFINE_CLASS()
284 	/* rt-policy tasks do not have a timerslack */  in DEFINE_CLASS()
288 		/* when switching back to non-rt policy, restore timerslack */  in DEFINE_CLASS()
436 					 int policy, int reset_on_fork)  in user_check_sched_setscheduler()  argument
438 	if (fair_policy(policy)) {  in user_check_sched_setscheduler()
444 	if (rt_policy(policy)) {  in user_check_sched_setscheduler()
447 		/* Can't set/change the rt policy: */  in user_check_sched_setscheduler()
448 		if (policy != p->policy && !rlim_rtprio)  in user_check_sched_setscheduler()
458 	 * Can't set/change SCHED_DEADLINE policy at all for now  in user_check_sched_setscheduler()
463 	if (dl_policy(policy))  in user_check_sched_setscheduler()
470 	if (task_has_idle_policy(p) && !idle_policy(policy)) {  in user_check_sched_setscheduler()
496 	int oldpolicy = -1, policy = attr->sched_policy;  in __sched_setscheduler()  local
509 	/* Double check policy once rq lock held: */  in __sched_setscheduler()
510 	if (policy < 0) {  in __sched_setscheduler()
512 		policy = oldpolicy = p->policy;  in __sched_setscheduler()
516 		if (!valid_policy(policy))  in __sched_setscheduler()
530 	if ((dl_policy(policy) && !__checkparam_dl(attr)) ||  in __sched_setscheduler()
531 	    (rt_policy(policy) != (attr->sched_priority != 0)))  in __sched_setscheduler()
535 		retval = user_check_sched_setscheduler(p, attr, policy, reset_on_fork);  in __sched_setscheduler()
558 	if (dl_policy(policy) || dl_policy(p->policy)) {  in __sched_setscheduler()
567 	 * To be able to change p->policy safely, the appropriate  in __sched_setscheduler()
574 	 * Changing the policy of the stop threads its a very bad idea:  in __sched_setscheduler()
581 	retval = scx_check_setscheduler(p, policy);  in __sched_setscheduler()
589 	if (unlikely(policy == p->policy)) {  in __sched_setscheduler()
590 		if (fair_policy(policy) &&  in __sched_setscheduler()
594 		if (rt_policy(policy) && attr->sched_priority != p->rt_priority)  in __sched_setscheduler()
596 		if (dl_policy(policy) && dl_param_changed(p, attr))  in __sched_setscheduler()
614 				rt_bandwidth_enabled() && rt_policy(policy) &&  in __sched_setscheduler()
621 		if (dl_bandwidth_enabled() && dl_policy(policy) &&  in __sched_setscheduler()
638 	/* Re-check policy now with rq lock held: */  in __sched_setscheduler()
639 	if (unlikely(oldpolicy != -1 && oldpolicy != p->policy)) {  in __sched_setscheduler()
640 		policy = oldpolicy = -1;  in __sched_setscheduler()
652 	if ((dl_policy(policy) || dl_task(p)) && sched_dl_overflow(p, policy, attr)) {  in __sched_setscheduler()
660 	newprio = __normal_prio(policy, attr->sched_priority, attr->sched_nice);  in __sched_setscheduler()
675 	next_class = __setscheduler_class(policy, newprio);  in __sched_setscheduler()
723 static int _sched_setscheduler(struct task_struct *p, int policy,  in _sched_setscheduler()  argument
727 		.sched_policy   = policy,  in _sched_setscheduler()
736 	if ((policy != SETPARAM_POLICY) && (policy & SCHED_RESET_ON_FORK)) {  in _sched_setscheduler()
738 		policy &= ~SCHED_RESET_ON_FORK;  in _sched_setscheduler()
739 		attr.sched_policy = policy;  in _sched_setscheduler()
745  * sched_setscheduler - change the scheduling policy and/or RT priority of a thread.
747  * @policy: new policy.
756 int sched_setscheduler(struct task_struct *p, int policy,  in sched_setscheduler()  argument
759 	return _sched_setscheduler(p, policy, param, true);  in sched_setscheduler()
774 …* sched_setscheduler_nocheck - change the scheduling policy and/or RT priority of a thread from ke…
776  * @policy: new policy.
786 int sched_setscheduler_nocheck(struct task_struct *p, int policy,  in sched_setscheduler_nocheck()  argument
789 	return _sched_setscheduler(p, policy, param, false);  in sched_setscheduler_nocheck()
851 do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param)  in do_sched_setscheduler()  argument
864 	return sched_setscheduler(p, policy, &lparam);  in do_sched_setscheduler()
925  * sys_sched_setscheduler - set/change the scheduler policy and RT priority
927  * @policy: new policy.
932 SYSCALL_DEFINE3(sched_setscheduler, pid_t, pid, int, policy, struct sched_param __user *, param)  in SYSCALL_DEFINE3()  argument
934 	if (policy < 0)  in SYSCALL_DEFINE3()
937 	return do_sched_setscheduler(pid, policy, param);  in SYSCALL_DEFINE3()
987  * sys_sched_getscheduler - get the policy (scheduling class) of a thread
990  * Return: On success, the policy of the thread. Otherwise, a negative error
1008 		retval = p->policy;  in SYSCALL_DEFINE1()
1078 		kattr.sched_policy = p->policy;  in SYSCALL_DEFINE4()
1455  * @policy: scheduling class.
1461 SYSCALL_DEFINE1(sched_get_priority_max, int, policy)  in SYSCALL_DEFINE1()  argument
1465 	switch (policy) {  in SYSCALL_DEFINE1()
1483  * @policy: scheduling class.
1489 SYSCALL_DEFINE1(sched_get_priority_min, int, policy)  in SYSCALL_DEFINE1()  argument
1493 	switch (policy) {  in SYSCALL_DEFINE1()