linux-kernel - Re: [tip:x86/cpu] x86, cpu: Fix X86_FEATURE

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Message-ID: <20101005165356.GA6569@a1.tnic>
Date:	Tue, 5 Oct 2010 18:53:56 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	hpa@...or.com, linux-tip-commits@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com,
	torvalds@...ux-foundation.org, ryan@...osecc.com,
	tglx@...utronix.de
Subject: Re: [tip:x86/cpu] x86, cpu: Fix X86_FEATURE_NOPL

From: "H. Peter Anvin" <hpa@...ux.intel.com>
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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