linux-kernel - Re: [RFC: 2.6 patch] i386: remove support for the Rise CPU

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Message-ID: <465F07F0.3000406@cv-sv.de>
Date:	Thu, 31 May 2007 19:37:52 +0200
From:	Christian Volkmann <haveaniceday@...sv.de>
To:	linux-kernel@...r.kernel.org
CC:	Dave Jones <davej@...hat.com>, Adrian Bunk <bunk@...sta.de>,
	Christian Volkmann <haveaniceday@...sv.de>, ak@...e.de,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC: 2.6 patch] i386: remove support for the Rise CPU

The SIS550 chip uses the mP6 core according to http://en.wikipedia.org/wiki/MP6
May be this code can improve the capability of these SIS550 system on a chip ?

But this should be a different story.

Dave Jones wrote:
> On Thu, May 31, 2007 at 07:22:38AM +0200, Adrian Bunk wrote:
>  > On Thu, May 17, 2007 at 05:47:54PM -0400, Dave Jones wrote:
>  > > On Thu, May 17, 2007 at 11:28:01PM +0200, Christian Volkmann wrote:
>  > > 
>  > >  > - Important: somebody to check other CPU types if the same behavior happens.
>  > > 
>  > > arch/i386/kernel/cpu/rise.c
>  > > 
>  > > Though, I've *never* seen or even heard of someone with one of those CPUs,
>  > > so whether we need to care is questionable. The mp6 did actually make it
>  > > to manufacture aparently, but I don't think anyone actually bought one.
>  > > http://en.wikipedia.org/wiki/Rise_Technology for a pic of this mythical beast.
>  > 
>  > Considering that arch/i386/kernel/cpu/rise.o takes a few bytes in every 
>  > i386 kernel image, what about removing it?
> 
> I'll be amazed if someone complains.
> We'll still boot fine on those CPUs without that support code too,
> we just won't advertise cx8 to userspace, and /proc/cpuinfo
> won't prettyprint the name. whoopdy-do.
> 
> Should we actually find someone who a) has one and b) is crazy enough
> to still run it today, we could always add this stuff back.
> 
> Signed-off-by: Dave Jones <davej@...hat.com>
> 
> 	Dave
> 

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