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

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Message-Id: <200701030212.l032CDXe015365@harpo.it.uu.se>
Date:	Wed, 3 Jan 2007 03:12:13 +0100 (MET)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	s0348365@....ed.ac.uk, torvalds@...l.org
Cc:	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 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.

/Mikael
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