diff options
Diffstat (limited to 'kernel/sched/syscalls.c')
| -rw-r--r-- | kernel/sched/syscalls.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/sched/syscalls.c b/kernel/sched/syscalls.c index 807879131add..0496dc29ed0f 100644 --- a/kernel/sched/syscalls.c +++ b/kernel/sched/syscalls.c @@ -824,6 +824,19 @@ void sched_set_fifo_low(struct task_struct *p) } EXPORT_SYMBOL_GPL(sched_set_fifo_low); +/* + * Used when the primary interrupt handler is forced into a thread, in addition + * to the (always threaded) secondary handler. The secondary handler gets a + * slightly lower priority so that the primary handler can preempt it, thereby + * emulating the behavior of a non-PREEMPT_RT system where the primary handler + * runs in hard interrupt context. + */ +void sched_set_fifo_secondary(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); +} + void sched_set_normal(struct task_struct *p, int nice) { struct sched_attr attr = { |