Re: [(RT RFC) PATCH v2 3/9] rearrange rt_spin_lock sleep

[Pavel Machek]

Hi!

> @@ -720,7 +728,8 @@ rt_spin_lock_slowlock(struct rt_mutex *lock)
>        * saved_state accordingly. If we did not get a real wakeup
>        * then we return with the saved state.
>        */
> -     saved_state = xchg(&current->state, TASK_UNINTERRUPTIBLE);
> +     saved_state = current->state;
> +     smp_mb();
>  
>       for (;;) {
>               unsigned long saved_flags;

Please document what the barrier is good for.

Plus, you are replacing atomic operation with nonatomic; is that ok?

                                                                        Pavel
-- 
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