Subject: Re: [PATCH] PowerPC: clockevents and HRT support

From: Benjamin Herrenschmidt <[email-masked]>
Date: Wed, 08 Nov 2006 10:04:44 +1100

>     That's not equivalent. What I wanted to cover with this option was 970 
> weirdness of the decrementer interrupts being level triggered and effectively 
> tied to the MSB of the decremeneter register...
>     Also, 40x decrementer is not Book E compatible.

Well... Is this specific to the 970 or also happens on all
POWER4..5..6 ? (I don't remember off the top of my head). It should
probably be a runtime check then.

> > Also, what's the problem with ppc64 deterministic accounting that you
> > can't fix it ?
> 
>     Arch-specific accounting hooks which this feature makes use of can't be 
> called from the generic clockevents code.

Then the generic clockevent code will have to be fixed or powerpc not
ported to it.

Ben.