Subject: Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with hardirq preemption

From: Benjamin Herrenschmidt <[email-masked]>
Date: Thu, 25 Sep 2008 17:22:41 +1000

On Thu, 2008-09-25 at 09:18 +0200, Sebastien Dugue wrote:
> 
> > Ok, that's the right approach then. It should work. I don't know
> what
> > the specific problems with HEA are at this stage.
> 
>   Yep, except as it behaves in way that the current -rt fasteoi flow
> cannot handle.

We probably need to make a special xics flow handler for -rt that does
what Milton suggested, ie, bring down the CPU priority right away and
only EOI later or something like that, instead of masking/unmasking.

I don't know what are the other potential issues with the HEA though.

Ben.