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

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Message-ID: <alpine.LFD.1.10.0809062311540.3243@apollo.tec.linutronix.de>
Date:	Sat, 6 Sep 2008 23:15:25 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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:
> > > 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.

One gcc does:

    i++;
    if (i >= QUICK_PIT_ITERATIONS)
       goto out;
    expect--;

The other one does:

    i++;
    expect--;
    if (i >= QUICK_PIT_ITERATIONS)
       goto out;

Don't ask me which one is correct. It's just reality :(

/me goes back to consume legal german drugs

    tglx
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