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    SubjectRe: Fw: 2.6.16 crashes when running numastat on p575
    Andi Kleen wrote:
    > On Monday 03 April 2006 07:15, Paul Jackson wrote:
    > > - for (cpu = 0; cpu < NR_CPUS; cpu++) {
    > > + for_each_online_cpu(cpu) {
    > >
    > > Idle curiosity -- what keeps a cpu from going offline during
    > > this scan, and leaving us with the same crash as before?
    > CPU hotdown uses RCU like techniques to avoid this. Only potential
    > problem could be on a preemptive kernel, but I hope nobody tries
    > cpu unplug on such a beast.

    I always turn on preempt when testing cpu hotplug (usually on ppc64).
    There were several preempt vs cpu hotplug issues until around 2.6.10
    or so, iirc, but I think the situation has been stable for a while
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