linux-kernel - Re: [PATCH 0/6] MSI portability cleanups

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Message-ID: <45BD0BDC.40205@garzik.org>
Date:	Sun, 28 Jan 2007 15:47:24 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Tony Luck <tony.luck@...el.com>,
	Grant Grundler <grundler@...isc-linux.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Kyle McMartin <kyle@...isc-linux.org>, linuxppc-dev@...abs.org,
	Brice Goglin <brice@...i.com>, shaohua.li@...el.com,
	linux-pci@...ey.karlin.mff.cuni.cz,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 0/6] MSI portability cleanups

Benjamin Herrenschmidt wrote:
>> The only architecture problem that isn't solvable in this context is
>> the problem of supporting the crazy hypervisor on the ppc RTAS, which
>> asks us to drive the hardware but does not give us access to the
>> hardware registers.
> 
> So you are saying that we should use your model while admitting that it
> can't solve our problems...
> 
> I really don't understand why you seem so totally opposed to Michael's
> approach which definitely looks to me like the sane thing to do. Note
> that in the end, Michael's approach isn't -that- different from yours,
> just a bit more abstracted.


I think the high-level ops approach makes more sense.  It's more future 
proof, in addition to covering all existing implementations.

	Jeff


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