RE: [Xen-devel] bogus HPET initialization order on x86

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 10.03.11 at 04:35, "Wei, Gang" <gang.wei@xxxxxxxxx> wrote:
> Jan Beulich wrote on 2011-03-09:
>> Also, what's the point of decrementing the per-CPU irq_count in
>> hpet_legacy_irq_tick()?
> 
> The per-CPU irq_count are used for calculate the total irq number excluding 
> hpet irqs in a past period to give a estimation of IO frequence. The hpet irq 
> was counted in do_IRQ, so need to reduce it while handling it. You can see 
> another one in hpet_interrupt_handler().

I can understand the latter, but the one I was asking about
decrements irq_count even if not calling the event handler (i.e.
when returning zero from the function). In other words, I would
have understood what this is for if it was sitting after the initial
if().

Jan


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