find_userfault_in

Name:ault_pending_wqh.lock must be hold by the caller

Proto:static inline struct userfaultfd_wait_queue *find_userfault_in(wait_queue_head_t *wqh)

Type:struct userfaultfd_wait_queue

Parameter:

Type	Parameter	Name
wait_queue_head_t *	wqh

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lockdep_assert_held( & lock)

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uwq = NULL

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If Not waitqueue_active -- locklessly test for waiters on the queue*@wq_head: the waitqueue to test for waiters* returns true if the wait list is not empty* NOTE: this function is lockless and requires care, incorrect usage _will_ Then Go to out

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wq = list_last_entry - get the last element from a list*@ptr: the list head to take the element from.*@type: the type of the struct this is embedded in.*@member: the name of the list_head within the struct.* Note, that list is expected to be not empty.( & head, typeof( * wq), entry)

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uwq = container_of - cast a member of a structure out to the containing structure*@ptr: the pointer to the member.*@type: the type of the container struct this is embedded in.*@member: the name of the member within the struct.(wq, structuserfaultfd_wait_queue, wq)

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out :

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Return uwq

**Caller**
Name	Describe
find_userfault
find_userfault_evt

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