synchronize_rcu_expedited

Name:synchronize_rcu_expedited - Brute-force RCU grace period* Wait for an RCU grace period, but expedite it

Proto:void synchronize_rcu_expedited(void)

Type:void

Parameter:Nothing

793

boottime = The rcu_scheduler_active variable is initialized to the value* RCU_SCHEDULER_INACTIVE and transitions RCU_SCHEDULER_INIT just before the* first task is spawned == RCU_SCHEDULER_INIT

798

RCU_LOCKDEP_WARN(lock_is_held( & rcu_bh_lock_map) || lock_is_held( & rcu_lock_map) || lock_is_held( & rcu_sched_lock_map), "Illegal synchronize_rcu_expedited() in RCU read-side critical section")

804

If During early boot, any blocking grace-period wait automatically* implies a grace period Then Return

808

If Should expedited grace-period primitives always fall back to their* non-expedited counterparts? Intended for use within RCU. Note* that if the user specifies both rcu_expedited and rcu_normal, then* rcu_normal wins Then

809

wait_rcu_gp(all_rcu() - Queue an RCU callback for invocation after a grace period)

810

Return

814

s = Take a snapshot of the expedited-grace-period counter.

815

If Funnel-lock acquisition for expedited grace periods Then Return

819

If Value for the false possibility is greater at compile time(boottime) Then

821

Common code to drive an expedited grace period forward, used by* workqueues and mid-boot-time tasks.

822

Else

824

rew_s = s

825

INIT_WORK_ONSTACK( & rew_work, Work-queue handler to drive an expedited grace period forward.)

826

queue_work - queue work on a workqueue*@wq: workqueue to use*@work: work to queue* Returns %false if @work was already on a queue, %true otherwise.* We queue the work to the CPU on which it was submitted, but if the CPU dies

830

rnp = Return the root node of the rcu_state structure.

831

wait_event - sleep until a condition gets true*@wq_head: the waitqueue to wait on*@condition: a C expression for the event to wait for* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the*@condition evaluates to true(exp_wq[Return the counter portion of a sequence number previously returned* by rcu_seq_snap() or rcu_seq_current(). & 0x3], Common code for work-done checking. )

833

836

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

838

If Value is more likely to compile time(!boottime) Then destroy_work_on_stack( & rew_work)

**Caller**
Name	Describe
rcu_test_sync_prims	Test each non-SRCU synchronous grace-period wait API. This is* useful just after a change in mode for these primitives, and* during early boot.
synchronize_rcu	synchronize_rcu - wait until a grace period has elapsed
bdi_remove_from_list	Remove bdi from bdi_list, and ensure that it is no longer visible
namespace_unlock

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