linux-kernel - Re: [RFC patch 0/4] TSC calibration improvements

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Message-ID: <alpine.LFD.1.10.0809061351170.3117@nehalem.linux-foundation.org>
Date:	Sat, 6 Sep 2008 13:55:07 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Alok Kataria <akataria@...are.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Veen <arjan@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Dan Hecht <dhecht@...are.com>,
	Garrett Smith <garrett@...are.com>
Subject: Re: [RFC patch 0/4] TSC calibration improvements

On Sat, 6 Sep 2008, Linus Torvalds wrote:

> 
> 
> On Sat, 6 Sep 2008, Thomas Gleixner wrote:
> > 
> > Just checked. The -tip version still has the expect-- in the for()
> > which might lead to stupid results depending on the gcc madness level.
> 
> Umm. What? You're on some odd drugs.

Oh, you mean te "--expect" in the last pit_expect_msb(). Yeah, that one 
looks bogus, but I don't understand what it has to do with gcc at all.

"expect" is an unsigned char. There are absolutely _zero_ issues with 
overflow, underflow, random phases of the moon, madness levels or anything 
else. But yes, it does look like Ingo screwed up when adding that final 
check, since expect was already decremented at the end of the loop.

Ingo? Did you actually test it?

		Linus
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