[LinuxPPS] LinuxPPS 5.3.2 strange behaviour

[Rodolfo Giometti]

On Tue, Sep 30, 2008 at 06:25:43PM -0400, George Spelvin wrote:
> > On Tue, Sep 30, 2008 at 04:00:04PM -0400, George Spelvin wrote:

> > The PPS_IRQ_EVENTS option is not so clear explained into the LinuxPPS
> > wiki... maybe me or someone else should write something about
> > it... any candidates? :)
> 
> I thought it just grabbed the timestamp early in the interrupt handler
> and passed it down.  That should WORK fine with a shared interrupt,
> it'll just add overhead when the other handler doesn't need the timestamp.

No, the IRQ is grabbed so early that we cannot know which is the IRQ
source at all! That's why sharing the IRQ line is wrong.

Ciao,

Rodolfo

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