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SubjectRe: [PATCH 1/2] x86: mce init optimization and signedness fixup
On Thu, 11 Oct 2007, Christoph Egger wrote:
> On Thursday 11 October 2007 16:55:36 Thomas Gleixner wrote:
> > > > > +
> > > > > + if (!cpu_has(c, X86_FEATURE_MCA) || !cpu_has(c, X86_FEATURE_MCE)) {
> > > > > + printk(KERN_INFO "CPU%i: No machine check support available\n",
> > > > > + smp_processor_id());
> > > > > + return;
> > > >
> > > > This breaks winchip MCE support.
> > >
> > > First, what is a winchip? It sounds to be something windows specific. ;)
> > > Second, can you explain in which way MCE support gets broken, please?
> >
> > First, winchip is the code name of Centaurs early x86 cpus.
> >
> > Second, those beasts do not have FEATURE_MCA, but they have FEATURE_MCE,
> > so they support the fatal exception, but not the non fatal check.
>
> So when I change the above code snippet to:
>
> + if (!cpu_has(c, X86_FEATURE_MCE)) {
> + printk(KERN_INFO "CPU%i: No machine check support available\n",
> + smp_processor_id());
> + return;
>
> Would this make the whole patch acceptable then?

Yeah, but then we can clean up the extra checks for _MCE in the various
cpu type init functions as well.

tglx
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