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DateThu, 10 Jan 2002 14:11:21 +0100 (CET)
FromIngo Molnar <>
SubjectRe: lock order in O(1) scheduler
On 10 Jan 2002, Robert Love wrote:

> I believe the code should be:
>
>          if (target_cpu < smp_processor_id()) {
>                  spin_lock_irq(&target_rq->lock);
>                  spin_lock(&this_rq->lock);
>          } else {
>                  spin_lock_irq(&this_rq->lock);
>                  spin_lock(&target_rq->lock);
>          }
>
> Not so sure about unlocking.  Ingo?

yep, correct, good catch!

the unlocking order does not matter much.

	Ingo

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