On 2025-09-08 08:36:32 [+0200], Lukas Wunner wrote:
> --- a/kernel/sched/syscalls.c
> +++ b/kernel/sched/syscalls.c
> @@ -847,6 +847,15 @@ void sched_set_fifo(struct task_struct *p)
> EXPORT_SYMBOL_GPL(sched_set_fifo);
>
> /*
> + * Secondary IRQ handler has slightly lower priority than primary IRQ handler.
For tasks that should be sched_set_fifo() but require not to preempt
another sched_set_fifo() task.
> + */
> +void sched_set_fifo_minus_one(struct task_struct *p)
> +{
> + struct sched_param sp = { .sched_priority = MAX_RT_PRIO / 2 - 1 };
> + WARN_ON_ONCE(sched_setscheduler_nocheck(p, SCHED_FIFO, &sp) != 0);
> +}
> +
> +/*
> * For when you don't much care about FIFO, but want to be above SCHED_NORMAL.
> */
> void sched_set_fifo_low(struct task_struct *p)
