On Thu, Sep 22, 2016 at 02:25:01PM -0400, Mikulas Patocka wrote:
> I've found a document that says that cond_resched() is needed on
> preemptible kernels to mark RCU quiescent states:
> https://lwn.net/Articles/603252/
> Paul, is cond_resched() still needed on current RCU implementation? Or not?

No, we ripped that out. See 4a81e8328d37 ("rcu: Reduce overhead of
cond_resched() checks for RCU")

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