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    Subject[patch 0/4] CPU Hotplug support for X86_64
    [Oops: This is correct version: i send from the wrong directory earlier]
    [Sorry about that spam... now i thin i know how to use quilt :-)]

    This implements cpu hotplug support for X86_64.
    Modified after initial feedback from Andi.

    [PS: hopefully subject is now fixed with different subject lines]

    Seems to hold up for make -j, with online/offline activity.

    The series of patches are split as follows:

    1. initcall cleanup
    - Left __cpuinit cases as before per Andi
    - Added a few new ones, and removed couple that could stay __init
    even with cpu hotplug.
    2. Core logical online/offline of cpus
    - start with maxcpus=1, and then echo 1 to /sys/devices/system/online
    - Can also bringup all cpus and then bring up/down all but cpu0.
    - Also tested with numa=fake=2
    3. Cleanup sibling map for cpu hotplug support.
    4. Dont use IPI broadcast in smp_call_function() when using CPU hotplug.
    Hopefully this is some reasonable middle ground starting point.
    - Dont let a new cpu respond to IPI's.
    - Automaticaly selected if CPU hotplus is choosen.
    - Can also be turned on cmdline via safe_ipi=1


    TBD:

    1. Track down CONFIG_SCHED_SMT Oops with both cpu up/down.
    2. Test on real NUMA hw.


    Cheers,
    Ashok Raj
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