* Oleg Nesterov <[email protected]> wrote:
> It is a bit annoying that do_exit() takes ->pi_lock to set PF_EXITING.
> All we need is to synchronize with lookup_pi_state() which saw this task
> without PF_EXITING under ->pi_lock.
>
> Change do_exit() to use spin_unlock_wait().
>
> Signed-off-by: Oleg Nesterov <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
> - spin_lock_irq(&tsk->pi_lock);
> - tsk->flags |= PF_EXITING;
> - spin_unlock_irq(&tsk->pi_lock);
> + smp_mb();
> + spin_unlock_wait(&tsk->pi_lock);
hm, isnt spin_unlock_wait() an SMP barrier in itself? (if not then it
should be.)
Ingo
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