linux-kernel - Re: [discuss] [PATCH 1/3] x86_64: additions to the i386 alternative extensions to support x86

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Date:	Tue, 20 Feb 2007 21:10:42 +0100
From:	"Joerg Roedel" <joerg.roedel@....com>
To:	"Andi Kleen" <ak@...e.de>
cc:	discuss@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [discuss] [PATCH 1/3] x86_64: additions to the i386
 alternative extensions to support x86_64 architecture

On Mon, Feb 19, 2007 at 10:29:22PM +0100, Andi Kleen wrote:
> On Monday 19 February 2007 20:07, Joerg Roedel wrote:
> > From: Joerg Roedel <joerg.roedel@....com>
> > 
> > This patch adds the necessary changes to extend the i386 alternative
> > instruction framework extension on the x86_64 architecture.
> 
> Looks complicated and somewhat fragile.

The tests on i386 and x86_64 just work fine :-)

> I think I would prefer it if you changed the pad field to a "bit not set"
> cpuid field. Then at least 2 alternatives + a nothing alternative could
> be described too.

I'm not sure I fully understand what you mean. Do you mean to add a
further alternative instruction to the struct for supporting 2 alternative
instructions?

Joerg

-- 
Joerg Roedel
Operating System Research Center
AMD Saxony LLC & Co. KG


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