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

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Message-Id: <1222291005.8277.86.camel@pasglop>
Date:	Thu, 25 Sep 2008 07:16:45 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Milton Miller <miltonm@....com>
Cc:	Sebastien Dugue <sebastien.dugue@...l.net>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, Christoph Raisch <RAISCH@...ibm.com>,
	linuxppc-dev@...abs.org, Jan-Bernd Themann <ossthema@...ibm.com>
Subject: Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with
	hardirq preemption

On Wed, 2008-09-24 at 11:42 -0500, Milton Miller wrote:
> 
> I was trying to understand why the mask and early eoi, but I guess its 
> to handle other more limited interrupt controllers where the interrupts 
> stack in hardware instead of software.

No Milton, we must do it that way, because the EOI must be done on the
right CPU even on XICS, or we won't get the CPU priority back properly.

Ben.

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