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sched,irq: Convert to sched_set_fifo()

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Because SCHED_FIFO is a broken scheduler model (see previous patches)
take away the priority field, the kernel can't possibly make an
informed decision.

Effectively no change.

Cc: tglx@linutronix.de
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2020-04-21 12:09:13 +02:00
parent 94beddacb5
commit 7a40798c71
1 changed files with 1 additions and 5 deletions
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6
kernel/irq/manage.c
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@ -1271,9 +1271,6 @@ static int
setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
{
struct task_struct *t;
struct sched_param param = {
.sched_priority = MAX_USER_RT_PRIO/2,
};
if (!secondary) {
t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
@ -1281,13 +1278,12 @@ setup_irq_thread(struct irqaction *new, unsigned int irq, bool secondary)
} else {
t = kthread_create(irq_thread, new, "irq/%d-s-%s", irq,
new->name);
param.sched_priority -= 1;
}
if (IS_ERR(t))
return PTR_ERR(t);
sched_setscheduler_nocheck(t, SCHED_FIFO, &param);
sched_set_fifo(t);
/*
* We keep the reference to the task struct even if