On Sun, Aug 03, 2014 at 10:36:16PM -0400, Waiman Long wrote: > For a fully preemptive kernel, a call to preempt_enable() could > potentially trigger a task rescheduling event. In the case of rwsem > optimistic spinning, the task has either gotten the lock or is going > to sleep soon. So there is no point to do rescheduling here.
Uh what? Why shouldn't we preempt if we've gotten the lock? What if a FIFO task just woke up?
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