linux-kernel - Re: 2.6.39-rc5-git2 boot crashs

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Date:	Wed, 4 May 2011 09:38:54 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, werner <w.landgraf@...ru>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.39-rc5-git2 boot crashs


* Borislav Petkov <bp@...en8.de> wrote:

> On Tue, May 03, 2011 at 02:45:10PM -0700, Linus Torvalds wrote:
> > Now, Werner is actually _running_ on an AMD Opteron (or whatever
> > family 15 is), I think.
> 
> http://marc.info/?l=linux-kernel&m=130438580705332 says it's a AMD
> Athlon(tm) 64 X2 Dual Core Processor 4800+, i.e. a good old K8 desktop.
> The X86_ELAN Kconfig option, however, says:
> 
> config X86_ELAN
> 	bool "AMD Elan"
> 	depends on X86_32
> 	depends on X86_EXTENDED_PLATFORM
> 	---help---
> 	  Select this for an AMD Elan processor.
> 
> 	  Do not use this option for K6/Athlon/Opteron processors!
> 
> 	  If unsure, choose "PC-compatible" instead.
> 
> so if the sentence before last used to mean anything, this could be a
> problem. Quick search about it gives http://lkml.org/lkml/2004/1/12/239
> which introduces that different compiler arch for ELAN: -march=i486,
> which could conflict with the generic selection?

Well, but CONFIG_X86_ELAN=y always worked/booted fine on generic hardware - 
including later AMD CPUs. I have booted it on an AMD Athlon64 CPU today:

 config-Wed_May__4_09_26_50_CEST_2011.good:CONFIG_X86_32_SMP=y
 config-Wed_May__4_09_26_50_CEST_2011.good:CONFIG_MELAN=y
 config-Wed_May__4_09_26_50_CEST_2011.good:CONFIG_SMP=y

When it comes to regressions it's past behavior that counts, not the Kconfig 
help text.

Thanks,

	Ingo
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