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sched: Simplify set_user_nice()

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Use guards to reduce gotos and simplify control flow.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2023-06-09 20:52:55 +02:00 committed by Ingo Molnar
parent 0bb80ecc33
commit 94b548a15e
2 changed files with 11 additions and 7 deletions
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13
kernel/sched/core.c
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@ -7187,9 +7187,8 @@ static inline int rt_effective_prio(struct task_struct *p, int prio)
void set_user_nice(struct task_struct *p, long nice)
{
bool queued, running;
int old_prio;
struct rq_flags rf;
struct rq *rq;
int old_prio;
if (task_nice(p) == nice || nice < MIN_NICE || nice > MAX_NICE)
return;
@ -7197,7 +7196,9 @@ void set_user_nice(struct task_struct *p, long nice)
* We have to be careful, if called from sys_setpriority(),
* the task might be in the middle of scheduling on another CPU.
*/
rq = task_rq_lock(p, &rf);
CLASS(task_rq_lock, rq_guard)(p);
rq = rq_guard.rq;
update_rq_clock(rq);
/*
@ -7208,8 +7209,9 @@ void set_user_nice(struct task_struct *p, long nice)
*/
if (task_has_dl_policy(p) || task_has_rt_policy(p)) {
p->static_prio = NICE_TO_PRIO(nice);
goto out_unlock;
return;
}
queued = task_on_rq_queued(p);
running = task_current(rq, p);
if (queued)
@ -7232,9 +7234,6 @@ void set_user_nice(struct task_struct *p, long nice)
* lowered its priority, then reschedule its CPU:
*/
p->sched_class->prio_changed(rq, p, old_prio);
out_unlock:
task_rq_unlock(rq, p, &rf);
}
EXPORT_SYMBOL(set_user_nice);

5
kernel/sched/sched.h
View File

@ -1658,6 +1658,11 @@ task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
}
DEFINE_LOCK_GUARD_1(task_rq_lock, struct task_struct,
_T->rq = task_rq_lock(_T->lock, &_T->rf),
task_rq_unlock(_T->rq, _T->lock, &_T->rf),
struct rq *rq; struct rq_flags rf)
static inline void
rq_lock_irqsave(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)