| Date | Wed, 21 Aug 2019 14:09:18 +0200 | From | Frederic Weisbecker <> | Subject | Re: [patch 07/44] posix-cpu-timers: Simplify sighand locking in run_posix_cpu_timers() |
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On Mon, Aug 19, 2019 at 04:31:48PM +0200, Thomas Gleixner wrote: > run_posix_cpu_timers() is called from the timer interrupt. The posix timer > expiry always affects the current task which got interrupted. > > sighand locking is only racy when done on a foreign task, which must use > lock_task_sighand(). But in case of run_posix_cpu_timers() that's > pointless. > > sighand of a task can only be dropped or changed by the task itself. Drop > happens in do_exit()
Well, that's only in case of autoreap. Otherwise this is dropped by the reaper.
> changing sighand happens in execve().
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