ep_poll_safewake

Name:ep_poll_safewake

Proto:static void ep_poll_safewake(wait_queue_head_t *wq)

Type:void

Parameter:

Type	Parameter	Name
wait_queue_head_t *	wq

561

local_irq_save(flags)

562

Even if we don't have any preemption, we need preempt disable/enable* to be barriers, so that we don't have things like get_user/put_user* that can cause faults and scheduling migrate into our preempt-protected* region.()

563

subclass = Operations for contexts that are safe from preemption/interrupts. These* operations verify that preemption is disabled.(As described in commit 0ccf831cb lockdep: annotate epoll* the use of wait queues used by epoll is done in a very controlled* manner)

564

spin_lock_nested( & lock, subclass + 1)

565

__this_cpu_inc(As described in commit 0ccf831cb lockdep: annotate epoll* the use of wait queues used by epoll is done in a very controlled* manner)

566

wake_up_locked_poll(wq, POLLIN)

567

__this_cpu_dec(As described in commit 0ccf831cb lockdep: annotate epoll* the use of wait queues used by epoll is done in a very controlled* manner)

568

spin_unlock( & lock)

569

local_irq_restore(flags)

570

preempt_enable()

**Caller**
Name	Describe
ep_free
ep_poll_callback	This is the callback that is passed to the wait queue wakeup* mechanism
ep_insert	Must be called with "mtx" held.
ep_modify	Modify the interest event mask by dropping an event if the new mask* has a match in the current file status. Must be called with "mtx" held.

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