Re: [tip:x86/cpu] x86, cpu: Fix X86_FEATURE_NOPL

[Borislav Petkov <bp@xxxxxxxxx>]

From: "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>
Date: Tue, Oct 05, 2010 at 09:30:37AM -0700

> On 10/5/2010 2:47 AM, Borislav Petkov wrote:
> >
> >tag it for -stable too?
> >
> 
> What is the flaw that justifies it for stable, or even .36?  It
> seems relatively harmless, with at most a very minor performance
> issue, unless I'm missing something?

I was thinking more along the lines of this being partially broken
when supplying non-constant arguments to cpu_has(), something like
<arch/x86/kernel/cpu/proc.c:show_cpuinfo()>, for example. But all this
could cause is /proc/cpuinfo not to report the "nopl" feature bit. I
guess this is too minor an issue to even to be considered for stable.

-- 
Regards/Gruss,
Boris.
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