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    SubjectRe: [PATCH tip/core/rcu 03/15] rcu: Drive TASKS_RCU directly off of PREEMPT
    On Mon, 24 Jul 2017 14:44:32 -0700
    "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:

    > The actual use of TASKS_RCU is only when PREEMPT, otherwise RCU-sched
    > is used instead. This commit therefore makes synchronize_rcu_tasks()
    > and call_rcu_tasks() available always, but mapped to synchronize_sched()
    > and call_rcu_sched(), respectively, when !PREEMPT. This approach also
    > allows some #ifdefs to be removed from rcutorture.
    >

    Hmm, I'll need to update ftrace. I believe I call synchronize_sched()
    twice with !PREEMPT then.

    -- Steve

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