linux-kernel - Re: kernel + gcc 4.1 = several problems

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Message-Id: <200701051553.04673.s0348365@sms.ed.ac.uk>
Date:	Fri, 5 Jan 2007 15:53:04 +0000
From:	Alistair John Strachan <s0348365@....ed.ac.uk>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	torvalds@...l.org, 76306.1226@...puserve.com, akpm@...l.org,
	bunk@...sta.de, greg@...ah.com, linux-kernel@...r.kernel.org,
	yanmin_zhang@...ux.intel.com
Subject: Re: kernel + gcc 4.1 = several problems

On Wednesday 03 January 2007 02:20, Alistair John Strachan wrote:
> On Wednesday 03 January 2007 02:12, Mikael Pettersson wrote:
> > On Tue, 2 Jan 2007 17:43:00 -0800 (PST), Linus Torvalds wrote:
> > > > The suggestions I've had so far which I have not yet tried:
> > > >
> > > > -	Select a different x86 CPU in the config.
> > > > 		-	Unfortunately the C3-2 flags seem to simply tell GCC
> > > > 			to schedule for ppro (like i686) and enabled MMX and SSE
> > > > 		-	Probably useless
> > >
> > > Actually, try this one. Try using something that doesn't like "cmov".
> > > Maybe the C3-2 simply has some internal cmov bugginess.
> >
> > That's a good suggestion. Earlier C3s didn't have cmov so it's
> > not entirely unlikely that cmov in C3-2 is broken in some cases.
> > Configuring for P5MMX or 486 should be good safe alternatives.
>
> Or just C3 (not C3-2), which is what I've done.
>
> I'll report back whether it crashes or not.

This didn't help. After about 14 hours, the machine crashed again.

cmov is not the culprit.

-- 
Cheers,
Alistair.

Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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