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    SubjectRe: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
    Date
    > +	 * We must write a positive value to the decrementer to clear
    > + * the interrupt on the IBM 970 CPU series. In periodic mode,
    > + * this happens when the decrementer gets reloaded later, but
    > + * in one-shot mode, we have to do it here since an event handler
    > + * may skip loading the new value...

    Nothing special about 970 here -- on *every* PowerPC,
    a decrementer exception exists as long as the high
    bit of the decrementer equals 1. BookE is different
    of course. Some other CPUs might deviate from the
    architecture as well.


    Segher

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