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    SubjectRe: [PATCH] Avoid mask based num_possible_cpus and num_online_cpus -v5
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    On Mon, Feb 13, 2012 at 12:44 PM, Srivatsa S. Bhat
    <srivatsa.bhat@linux.vnet.ibm.com> wrote:
    > IOW, what output do you see from the following printk from
    > arch/ia64/kernel/smpboot.c?
    >
    > printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
    >         (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100);

    That is a complicated question - because linux-next also has patches
    by Arjan that
    change how (when) cpus are brought online. Initially I blamed his
    patches and tried
    reverting them ... and saw the symptom you are wondering about (message said
    "Total of 1 processors", but the BogoMIPs was a number big enough to be all of
    them. Thanks to you, I can now understand why.

    Fix will be to stop ia64 from messing directly with cpu_online_map?

    -Tony
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