On Wed, 2013-06-26 at 15:28 -0400, Steven Rostedt wrote:
> @@ -2491,6 +2491,31 @@ static inline int rcu_blocking_is_gp(voi
> return ret;
> }
>
> +#ifdef CONFIG_PREEMPT_RT_FULL
> +DEFINE_LOCAL_IRQ_LOCK(rcu_sched_lock);
> +/*
> + * Real-time allows for synchronize sched to sleep but not migrate.
> + * This is done via the local locks. When calling synchronize_sched(),
> + * all the local locks need to be taken and released. This will ensure
> + * that all users of rcu_read_lock_sched() will be out of their critical
> + * sections at the completion of this function. synchronize_sched() will
> + * still perform the normal RCU sched operations to synchronize with
> + * locations that use disabling preemption or interrupts.
> + */
> +static void rcu_synchronize_sched_rt(void)
> +{
> + int cpu;
> +
> + for_each_possible_cpu(cpu) {
> + spin_lock(&per_cpu(rcu_sched_lock, cpu).lock);
> + spin_unlock(&per_cpu(rcu_sched_lock, cpu).lock);
> + }
> +}
Does that have to be possible vs online?
-Mike
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