Commit eb61baf6 authored by Ingo Molnar's avatar Ingo Molnar

sched/headers: Move the wake-queue types and interfaces from sched.h into <linux/sched/wake_q.h>

Acked-by: default avatarLinus 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: default avatarIngo Molnar <mingo@kernel.org>
parent 5dbe91de
......@@ -953,56 +953,6 @@ void force_schedstat_enabled(void);
# define SCHED_FIXEDPOINT_SHIFT 10
# define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
/*
* Wake-queues are lists of tasks with a pending wakeup, whose
* callers have already marked the task as woken internally,
* and can thus carry on. A common use case is being able to
* do the wakeups once the corresponding user lock as been
* released.
*
* We hold reference to each task in the list across the wakeup,
* thus guaranteeing that the memory is still valid by the time
* the actual wakeups are performed in wake_up_q().
*
* One per task suffices, because there's never a need for a task to be
* in two wake queues simultaneously; it is forbidden to abandon a task
* in a wake queue (a call to wake_up_q() _must_ follow), so if a task is
* already in a wake queue, the wakeup will happen soon and the second
* waker can just skip it.
*
* The DEFINE_WAKE_Q macro declares and initializes the list head.
* wake_up_q() does NOT reinitialize the list; it's expected to be
* called near the end of a function. Otherwise, the list can be
* re-initialized for later re-use by wake_q_init().
*
* Note that this can cause spurious wakeups. schedule() callers
* must ensure the call is done inside a loop, confirming that the
* wakeup condition has in fact occurred.
*/
struct wake_q_node {
struct wake_q_node *next;
};
struct wake_q_head {
struct wake_q_node *first;
struct wake_q_node **lastp;
};
#define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)
#define DEFINE_WAKE_Q(name) \
struct wake_q_head name = { WAKE_Q_TAIL, &name.first }
static inline void wake_q_init(struct wake_q_head *head)
{
head->first = WAKE_Q_TAIL;
head->lastp = &head->first;
}
extern void wake_q_add(struct wake_q_head *head,
struct task_struct *task);
extern void wake_up_q(struct wake_q_head *head);
struct io_context; /* See blkdev.h */
......@@ -1234,6 +1184,10 @@ enum perf_event_task_context {
perf_nr_task_contexts,
};
struct wake_q_node {
struct wake_q_node *next;
};
/* Track pages that require TLB flushes */
struct tlbflush_unmap_batch {
/*
......
#ifndef _LINUX_SCHED_WAKE_Q_H
#define _LINUX_SCHED_WAKE_Q_H
/*
* Wake-queues are lists of tasks with a pending wakeup, whose
* callers have already marked the task as woken internally,
* and can thus carry on. A common use case is being able to
* do the wakeups once the corresponding user lock as been
* released.
*
* We hold reference to each task in the list across the wakeup,
* thus guaranteeing that the memory is still valid by the time
* the actual wakeups are performed in wake_up_q().
*
* One per task suffices, because there's never a need for a task to be
* in two wake queues simultaneously; it is forbidden to abandon a task
* in a wake queue (a call to wake_up_q() _must_ follow), so if a task is
* already in a wake queue, the wakeup will happen soon and the second
* waker can just skip it.
*
* The DEFINE_WAKE_Q macro declares and initializes the list head.
* wake_up_q() does NOT reinitialize the list; it's expected to be
* called near the end of a function. Otherwise, the list can be
* re-initialized for later re-use by wake_q_init().
*
* Note that this can cause spurious wakeups. schedule() callers
* must ensure the call is done inside a loop, confirming that the
* wakeup condition has in fact occurred.
*/
#include <linux/sched.h>
struct wake_q_head {
struct wake_q_node *first;
struct wake_q_node **lastp;
};
#define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)
#define DEFINE_WAKE_Q(name) \
struct wake_q_head name = { WAKE_Q_TAIL, &name.first }
static inline void wake_q_init(struct wake_q_head *head)
{
head->first = WAKE_Q_TAIL;
head->lastp = &head->first;
}
extern void wake_q_add(struct wake_q_head *head,
struct task_struct *task);
extern void wake_up_q(struct wake_q_head *head);
#endif /* _LINUX_SCHED_WAKE_Q_H */
......@@ -30,7 +30,6 @@
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/security.h>
#include <linux/sched.h>
#include <linux/sched/wake_q.h>
#include <linux/syscalls.h>
#include <linux/audit.h>
......
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