函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\time\timer.c Create Date:2022-07-27 11:39:35
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：We are using hashed locking: Holding per_cpu(timer_bases[x]).lock means* that all timers which are tied to this base are locked, and the base itself* is locked too.* So __run_timers/migrate_timers can safely modify all timers which could

函数原型：static struct timer_base *lock_timer_base(struct timer_list *timer, unsigned long *flags)__acquires(timer->base->lock)

返回类型：struct timer_base

参数：

类型参数名称
struct timer_list *timer
unsigned long *flags
923  循环
932  tf等于READ_ONCE(flags)
934  如果非tf按位与TIMER_MIGRATING的值则
935  base等于get_timer_base(tf)
936  raw_spin_lock_irqsave( & lock, * flags)
937  如果flags恒等于tf则返回:base
939  raw_spin_unlock_irqrestore( & lock, * flags)
941  cpu_relax()
调用者
名称描述
__mod_timer
add_timer_onadd_timer_on - start a timer on a particular CPU*@timer: the timer to be added*@cpu: the CPU to start it on* This is not very scalable on SMP. Double adds are not possible.
del_timerdel_timer - deactivate a timer.*@timer: the timer to be deactivated* del_timer() deactivates a timer - this works on both active and inactive* timers.* The function returns whether it has deactivated a pending timer or not.* (ie
try_to_del_timer_syncry_to_del_timer_sync - Try to deactivate a timer*@timer: timer to delete* This function tries to deactivate a timer. Upon successful (ret >= 0)* exit the timer is not queued and the handler is not running on any CPU.