Hello!
> > In any case, Andrew, where is the race, when we enter in sleeping state?
> > Wakeup is not lost, it is just not required when we are not going
> > to schedule and force task to running state.
>
> set_current_state(TASK_INTERRUPTIBLE);
> add_wait_queue(...);
> /* window here */
> set_current_state(TASK_INTERRUPTIBLE);
> schedule();
>
> If there's a wakeup by another CPU (or this CPU in an interrupt) in
> that window, current->state will get switched to TASK_RUNNING.
>
> Then it's immediately overwritten and we go to sleep. Lost wakeup.
Look into code yet. It looks sort of different. Again:
> > Wakeup is not lost, it is just not required when we are not going
> > to schedule and force task to running state.
So that it is right not depening on anything.
Alexey
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