From: Denis Vlasenko <vda@ilport.com.ua>
To: "Jan Beulich" <JBeulich@novell.com>
Subject: Re: x86-fix-cmpxchg.patch added to -mm tree
Date: Mon, 12 Sep 2005 10:23:20 +0300
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Cc: akpm@osdl.org, "Dave Jones" <davej@redhat.com>, zwane@holomorphy.com,
       "Alan Cox" <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org,
       zach@vmware.com
References: <200509100006.j8A06rZm020089@shell0.pdx.osdl.net> <20050910003038.GH5283@redhat.com> <43253F2E0200007800024DD4@sinclair.provo.novell.com>
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On Monday 12 September 2005 09:41, Jan Beulich wrote:
> >>> Dave Jones <davej@redhat.com> 10.09.05 02:30:38 >>>
> >On Fri, Sep 09, 2005 at 05:06:56PM -0700, Andrew Morton wrote:
> >
> > > - cmpxchg8b gets disabled when the minimum specified hardware
> architectur
> > >   doesn't support it (like was already happening for the byte,
> word, and
> > >   long ones).
> > >
> > > +config X86_CMPXCHG64
> > > +	bool
> > > +	depends on !M386 && !M486 && !MCYRIXIII && !MGEODEGX1
> > > +	default y
> >
> >This is wrong.  All the Winchip/CyrixIII CPUs do indeed have cx8.
> >Though cpuid will report that it's missing until We explicitly enable
> >it in init_c3().  Whilst it's "disabled" however, the instruction does
> >run perfectly fine.   This was done because Win NT wouldn't boot if it
> >found a non Intel CPU which had cx8 iirc.

Can this be added to comments in the right place?

> >I'm not familiar with the Geode enough to answer definitively.
> >Alan seems to be the Geode-guru, and may still have datasheets for
> that.
> 
> Resubmitting adjusted patch (taking into account also Alan's later
> response).
--
vda
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