On Tue, 29 Sep 2015, Peter Zijlstra wrote:
> + /*
> + * Still have preempt_count() == 2, from:
> + *
> + * schedule()
> + * preempt_disable(); // 1
> + * __schedule()
> + * raw_spin_lock_irq(&rq->lock) // 2
> + */
> + rq = finish_task_switch(prev); /* drops rq->lock, preempt_count() == 1
> */
> balance_callback(rq);
> - preempt_enable();
> + preempt_enable(); /* preempt_count() == 0 */
Bah. I so hate tail comments. What's wrong with
+ /* preempt_count() ==> 0 */
preempt_enable();
Hmm?
tglx
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