sched/swait: Prepare usage in completions
As a preparation to use simple wait queues for completions: - Provide swake_up_all_locked() to support complete_all() - Make __prepare_to_swait() public available This is done to enable the usage of complete() within truly atomic contexts on a PREEMPT_RT enabled kernel. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200321113242.228481202@linutronix.dealistair/sensors
parent
e5d4d1756b
commit
b3212fe2bc
|
@ -2492,3 +2492,6 @@ static inline bool is_per_cpu_kthread(struct task_struct *p)
|
||||||
return true;
|
return true;
|
||||||
}
|
}
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
|
void swake_up_all_locked(struct swait_queue_head *q);
|
||||||
|
void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
|
||||||
|
|
|
@ -32,6 +32,19 @@ void swake_up_locked(struct swait_queue_head *q)
|
||||||
}
|
}
|
||||||
EXPORT_SYMBOL(swake_up_locked);
|
EXPORT_SYMBOL(swake_up_locked);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Wake up all waiters. This is an interface which is solely exposed for
|
||||||
|
* completions and not for general usage.
|
||||||
|
*
|
||||||
|
* It is intentionally different from swake_up_all() to allow usage from
|
||||||
|
* hard interrupt context and interrupt disabled regions.
|
||||||
|
*/
|
||||||
|
void swake_up_all_locked(struct swait_queue_head *q)
|
||||||
|
{
|
||||||
|
while (!list_empty(&q->task_list))
|
||||||
|
swake_up_locked(q);
|
||||||
|
}
|
||||||
|
|
||||||
void swake_up_one(struct swait_queue_head *q)
|
void swake_up_one(struct swait_queue_head *q)
|
||||||
{
|
{
|
||||||
unsigned long flags;
|
unsigned long flags;
|
||||||
|
@ -69,7 +82,7 @@ void swake_up_all(struct swait_queue_head *q)
|
||||||
}
|
}
|
||||||
EXPORT_SYMBOL(swake_up_all);
|
EXPORT_SYMBOL(swake_up_all);
|
||||||
|
|
||||||
static void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait)
|
void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait)
|
||||||
{
|
{
|
||||||
wait->task = current;
|
wait->task = current;
|
||||||
if (list_empty(&wait->task_list))
|
if (list_empty(&wait->task_list))
|
||||||
|
|
Loading…
Reference in New Issue