On Wed, Aug 13, 2014 at 09:51:32AM -0400, Steven Rostedt wrote: > I still need to look at the patches, but if this is just for the idle > case, then we don't need it. The idle case can be solved with a simple > sched_on_each_cpu(). I need a way to solve waiting for processes to > finish from a preemption point. > > That's all I want, and if we can remove the "idle" case and document it > well that it's not covered and a sched_on_each_cpu() may be needed, > then I'm fine with that. > > sched_on_each_cpu(dummy_op); > call_rcu_tasks(free_tramp);
Sure, but why not dtrt and push rcu_idle hooks all the way down into the idle drivers if and where appropriate? There isn't _that_ much idle driver code. Also, some stuff should be cleaned up; we're already calling stop_critical_timings() in the generic idle code, and then calling it again in the cpuidle drivers.
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