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    SubjectRe: [PATCH 8/8] intel_idle: create a native cpuidle driver for select intel processors

    > ... What happens when an additional CPU is brought online?
    > It melts? ;)

    With the current driver, processors hot-added after modprobe
    will use C1 only, and not use deeper C-states.

    Taking online processors offline and bringing them back online
    (like we do during suspend) works fine.

    > > + dev->cpu = i;
    > > + if (cpuidle_register_device(dev)) {
    > > + pr_debug(PREFIX "cpuidle_register_device %d failed!\n", i);
    > > + free_percpu(intel_idle_cpuidle_devices);
    > > + return -EIO;
    >
    > Should this unregister all the thus-far-registered devices?

    yes, that was a bug!

    thanks,
    Len Brown, Intel Open Source Technology Center



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