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SubjectRe: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
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> +	 * 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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