Re: [PATCH 3/3] arm_timer: remove a racy and obsolete PF_EXITING check

[Oleg Nesterov]

On 06/19, Roland McGrath wrote:
> 
> > However, for some reason it does so only for CPUCLOCK_PERTHREAD
> > case (which is imho wrong).
> 
> For a process CPU clock timer, ->it.cpu.task is the thread group leader.
> The group leader can exit and will be a lingering zombie for as long as
> other threads in the group live.  The process timers need to keep getting
> armed and working both during and after the group leader's exit processing.

Ah, yes. Also, I missed the fact that process_timer_rebalance() checks
PF_EXITING anyway (For a process CPU clock timer), so I was wrong twice.

Thanks!

Oleg.

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