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    SubjectRe: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads
    On Wed, 13 Jun 2012, Paul E. McKenney wrote:
    > On Wed, Jun 13, 2012 at 11:00:54AM -0000, Thomas Gleixner wrote:
    > > /* Now call notifier in preparation. */
    > > cpu_notify(CPU_ONLINE | mod, hcpu);
    > > + smpboot_unpark_threads(cpu);
    >
    > OK, RCU must use the lower-level interfaces, given that one of
    > then CPU_ONLINE notifiers might invoke synchronize_rcu().

    We can start the threads before the notifiers. There is no
    restriction.

    Thanks,

    tglx



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