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    SubjectRe: [PATCH]x86, reboot: Fix a warning message triggered by stop_other_cpus()
    Hi Don,

    On Tue, 22 May 2012 09:33:56 -0400
    Don Zickus <dzickus@redhat.com> wrote:

    > On Tue, May 22, 2012 at 10:52:33AM +0800, Feng Tang wrote:
    > >
    > > The root cause seems to be the default_send_IPI_mask_allbutself_phys()
    > > takes quiet some time (I measured it could be several ms) to complete
    > > sending NMIs to all the other 23 CPUs, and for HZ=250/1000 system, the
    >
    > I sent Ingo a patch (which he took in), that reverts this path to interrupts
    > again (and NMIs as a fallback if it fails). The problem will still exist
    > I assume though I don't know if it changes the timing characteristics.

    Thanks for your review and letting me know the revert which I just saw in
    the latest Linus' tree. And I think this new mechanism will greatly reduce
    the possibility, but it still exist as the old nmi_stop_other_cpus's
    implementation still exist. So

    Ingo,

    Could you review this patch? thanks,

    -Feng



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