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    SubjectRE: WARNING: at arch/x86/kernel/hpet.c:390 hpet_next_event+0x70/0x80() [occurs when ACPI_PROCESSOR=y]

    On Fri, 13 Nov 2009, Pallipadi, Venkatesh wrote:

    > On Fri, 2009-11-13 at 10:43 -0800, Justin Piszcz wrote:
    >> On Fri, 13 Nov 2009, Pallipadi, Venkatesh wrote:
    >>> On Fri, 2009-11-13 at 01:38 -0800, Thomas Gleixner wrote:
    >>>> On Thu, 12 Nov 2009, Pallipadi, Venkatesh wrote:
    >>>>> Yes. Yes. This is a hardware errata. I have a patch to workaround this and
    >>>>> waiting on the errata description to get published..
    >>>> Can we at least have some PCI quirk or whatever until you can push the
    >>>> final workaround out so peoples machines do not explode ?
    >>> Its a harmless bug functionality-wise and should not have any side
    >>> effect other than triggering the WARN_ON_ONCE in hpet next event code.
    >>> Thanks,
    >>> Venki
    >> Venki,
    >> When the following patch is applied though: (courtesy of john stultz)
    > Justin,
    > I am missing something in here.
    > Without the below patch, on and ACPI_PROCESSOR loaded (either
    > as module or builtin), you may see the WARNING. But, that should not
    > cause any other problems with C-states, P-states, or anything else.
    > Is that what you are seeing?
    > The below patch is not a workaround for the problem. Infact it will make
    > situation worse with constant stream of prinkts and can reduce the
    > C-state residency and turbo upside.
    > Thanks,
    > Venki


    Without the below patch and ACPI_PROCESSOR loaded:

    1. the warning? yes--however..
    2. my processor does not enter turbo boost mode without the processor
    3. the patch shows that the hpet writes are failing-- when the processor
    module is loaded, the cpu/mobo/vrm emits a high-pitch noise-- my guess
    is due to the hpet write failures, failing over and over, this does
    not occur when the processor module is not loaded.


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