Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\eventpoll.c Create Date:2022-07-28 20:19:06
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:all when ep->mtx cannot be held (ep_poll_callback)

Proto:static inline void ep_pm_stay_awake_rcu(struct epitem *epi)

Type:void

Parameter:

TypeParameterName
struct epitem *epi
643  _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
644  ws = fetch RCU-protected pointer for dereferencing(wakeup_source used when EPOLLWAKEUP is set )
645  If ws Then __pm_stay_awake(ws)
647  _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()
Caller
NameDescribe
ep_poll_callbackThis is the callback that is passed to the wait queue wakeup* mechanism