On Fri, 2013-09-06 at 08:18 -0700, Paul E. McKenney wrote:
> int rcu_is_cpu_idle(void)
> {
> int ret;
>
> preempt_disable();
> ret = (atomic_read(&__get_cpu_var(rcu_dynticks).dynticks) & 0x1) == 0;
> preempt_enable();
> return ret;
> }
Paul I find this very confusing.
If caller doesn't have preemption disabled, what could be the meaning of
this rcu_is_cpu_idle() call ?
Its result is meaningless if suddenly thread is preempted, so what is
the point ?
Sorry if this is obvious to you.
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