Messages in this thread | | | Date | Mon, 4 Aug 2014 14:25:15 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks() |
| |
On Mon, Aug 04, 2014 at 04:50:44AM -0700, Paul E. McKenney wrote: > OK, I will bite... > > What kinds of tasks are on a runqueue, but neither ->on_cpu nor > PREEMPT_ACTIVE?
Userspace tasks, they don't necessarily get PREEMPT_ACTIVE when preempted. Now obviously you're not _that_ interested in userspace tasks for this, so that might be ok.
But the main point was, you cannot use ->on_cpu or PREEMPT_ACTIVE without holding rq->lock. [unhandled content-type:application/pgp-signature] | |