psi_trigger_poll

Name:psi_trigger_poll

Proto:__poll_t psi_trigger_poll(void **trigger_ptr, struct file *file, poll_table *wait)

Type:__poll_t

Parameter:

Type	Parameter	Name
void **	trigger_ptr
struct file *	file
poll_table *	wait

1164

ret = DEFAULT_POLLMASK

1167

If static_branch_likely( & psi_disabled) Then Return DEFAULT_POLLMASK | EPOLLERR | EPOLLPRI

1170

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

1172

t = fetch RCU-protected pointer for dereferencing( * (void__rcu __force * * )trigger_ptr)

1173

If Not t Then

1174

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

1175

Return DEFAULT_POLLMASK | EPOLLERR | EPOLLPRI

1177

kref_get - increment refcount for object.*@kref: object.

1179

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

1181

poll_wait(file, & event_wait, wait)

1183

If cmpxchg( & event, 1, 0) == 1 Then ret |= EPOLLPRI

1186

kref_put - decrement refcount for object.*@kref: object.*@release: pointer to the function that will clean up the object when the* last reference to the object is released.* This pointer is required, and it is not acceptable to pass kfree

1188

Return ret

**Caller**
Name	Describe
psi_fop_poll

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