mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 08:02:07 +00:00
325ea10c08
Do the following cleanups and simplifications: - sched/sched.h already includes <asm/paravirt.h>, so no need to include it in sched/core.c again. - order the <linux/sched/*.h> headers alphabetically - add all <linux/sched/*.h> headers to kernel/sched/sched.h - remove all unnecessary includes from the .c files that are already included in kernel/sched/sched.h. Finally, make all scheduler .c files use a single common header: #include "sched.h" ... which now contains a union of the relied upon headers. This makes the various .c files easier to read and easier to handle. Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* <linux/swait.h> (simple wait queues ) implementation:
|
|
*/
|
|
#include "sched.h"
|
|
|
|
void __init_swait_queue_head(struct swait_queue_head *q, const char *name,
|
|
struct lock_class_key *key)
|
|
{
|
|
raw_spin_lock_init(&q->lock);
|
|
lockdep_set_class_and_name(&q->lock, key, name);
|
|
INIT_LIST_HEAD(&q->task_list);
|
|
}
|
|
EXPORT_SYMBOL(__init_swait_queue_head);
|
|
|
|
/*
|
|
* The thing about the wake_up_state() return value; I think we can ignore it.
|
|
*
|
|
* If for some reason it would return 0, that means the previously waiting
|
|
* task is already running, so it will observe condition true (or has already).
|
|
*/
|
|
void swake_up_locked(struct swait_queue_head *q)
|
|
{
|
|
struct swait_queue *curr;
|
|
|
|
if (list_empty(&q->task_list))
|
|
return;
|
|
|
|
curr = list_first_entry(&q->task_list, typeof(*curr), task_list);
|
|
wake_up_process(curr->task);
|
|
list_del_init(&curr->task_list);
|
|
}
|
|
EXPORT_SYMBOL(swake_up_locked);
|
|
|
|
void swake_up(struct swait_queue_head *q)
|
|
{
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&q->lock, flags);
|
|
swake_up_locked(q);
|
|
raw_spin_unlock_irqrestore(&q->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(swake_up);
|
|
|
|
/*
|
|
* Does not allow usage from IRQ disabled, since we must be able to
|
|
* release IRQs to guarantee bounded hold time.
|
|
*/
|
|
void swake_up_all(struct swait_queue_head *q)
|
|
{
|
|
struct swait_queue *curr;
|
|
LIST_HEAD(tmp);
|
|
|
|
raw_spin_lock_irq(&q->lock);
|
|
list_splice_init(&q->task_list, &tmp);
|
|
while (!list_empty(&tmp)) {
|
|
curr = list_first_entry(&tmp, typeof(*curr), task_list);
|
|
|
|
wake_up_state(curr->task, TASK_NORMAL);
|
|
list_del_init(&curr->task_list);
|
|
|
|
if (list_empty(&tmp))
|
|
break;
|
|
|
|
raw_spin_unlock_irq(&q->lock);
|
|
raw_spin_lock_irq(&q->lock);
|
|
}
|
|
raw_spin_unlock_irq(&q->lock);
|
|
}
|
|
EXPORT_SYMBOL(swake_up_all);
|
|
|
|
void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait)
|
|
{
|
|
wait->task = current;
|
|
if (list_empty(&wait->task_list))
|
|
list_add(&wait->task_list, &q->task_list);
|
|
}
|
|
|
|
void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state)
|
|
{
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&q->lock, flags);
|
|
__prepare_to_swait(q, wait);
|
|
set_current_state(state);
|
|
raw_spin_unlock_irqrestore(&q->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(prepare_to_swait);
|
|
|
|
long prepare_to_swait_event(struct swait_queue_head *q, struct swait_queue *wait, int state)
|
|
{
|
|
if (signal_pending_state(state, current))
|
|
return -ERESTARTSYS;
|
|
|
|
prepare_to_swait(q, wait, state);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(prepare_to_swait_event);
|
|
|
|
void __finish_swait(struct swait_queue_head *q, struct swait_queue *wait)
|
|
{
|
|
__set_current_state(TASK_RUNNING);
|
|
if (!list_empty(&wait->task_list))
|
|
list_del_init(&wait->task_list);
|
|
}
|
|
|
|
void finish_swait(struct swait_queue_head *q, struct swait_queue *wait)
|
|
{
|
|
unsigned long flags;
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
if (!list_empty_careful(&wait->task_list)) {
|
|
raw_spin_lock_irqsave(&q->lock, flags);
|
|
list_del_init(&wait->task_list);
|
|
raw_spin_unlock_irqrestore(&q->lock, flags);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(finish_swait);
|