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    SubjectRe: PATCH: Fix race in cpu_down (hotplug cpu)
    On Mon, Sep 19, 2005 at 03:23:01PM +1000, Nigel Cunningham wrote:
    > Maybe I'm just an ignoramus, but I was thinking (without being a
    > scheduler expert at all) that if the idle thread was already running,
    > trying to set it up to run next might possibly have zero effect. I've

    sched_idle_next actually adds the idle task to its runqueue (normally
    it is not present in a runqueue while running) and as well changes its
    priority/policy. So it does have *some* effect!

    > added a bit of debugging code to try and see in better detail what's
    > happening.

    Could you elaborate (with some stack traces maybe) on the deadlock you are
    seeing during resume? Maybe that can throw some light.

    --


    Thanks and Regards,
    Srivatsa Vaddagiri,
    Linux Technology Center,
    IBM Software Labs,
    Bangalore, INDIA - 560017
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