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

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Date:	Thu, 25 Sep 2008 17:22:41 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Sebastien Dugue <sebastien.dugue@...l.net>
Cc:	Milton Miller <miltonm@....com>,
	Jan-Bernd Themann <ossthema@...ibm.com>,
	Christoph Raisch <RAISCH@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with
	hardirq preemption

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.


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