函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\stop_machine.c Create Date:2022-07-27 12:23:44
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：This is the cpu_stop function which stops the CPU.

函数原型：static int multi_cpu_stop(void *data)

返回类型：int

参数：

类型参数名称
void *data
189  msdata等于data
190  curstate等于MULTI_STOP_NONE
191  cpu等于当前cpu ID(), err等于0
200  local_save_flags(flags)
202  如果非active_cpus则
203  cpumask等于cpu_online_mask
204  is_active等于cpu恒等于Uniprocessor. Assume all masks are "1".
205  否则
206  cpumask等于active_cpus
207  is_active等于测试CPU信息
211  循环
213  stop_machine_yield(cpumask)
214  newstate等于READ_ONCE(state)
215  如果newstate不等于curstate则
216  curstate等于newstate
218  当:curstate恒等于MULTI_STOP_DISABLE_IRQ
222  当:curstate恒等于MULTI_STOP_RUN
223  如果is_active则err等于fn(data)
225  退出
226  默认
227  退出
229  Last one to ack a state moves to the next state.
230  否则如果curstate大于MULTI_STOP_PREPARE则
236  h_nmi_watchdog - restart NMI watchdog timeout.* If the architecture supports the NMI watchdog, touch_nmi_watchdog()* may be used to reset the timeout - for code which intentionally* disables interrupts for a long time. This call is stateless.
238  Let the RCU core know that this CPU has gone through the scheduler,* which is a quiescent state
239  当curstate不等于MULTI_STOP_EXIT循环
241  local_irq_restore(flags)
242  返回:err
调用者
名称描述
stop_machine_from_inactive_cpustop_machine_from_inactive_cpu - stop_machine() from inactive CPU*@fn: the function to run*@data: the data ptr for the @fn()*@cpus: the cpus to run the @fn() on (NULL = any online cpu)* This is identical to stop_machine() but can be called from a CPU which