linux-kernel - Re: [BUG] x86 kenel won't boot under Virtual PC

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Message-ID: <48C54FA0.10302@kernel.org>
Date:	Mon, 08 Sep 2008 09:15:28 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Andi Kleen <andi@...stfloor.org>, linux@...dersweb.net,
	linux-kernel@...r.kernel.org,
	the arch/x86 maintainers <x86@...nel.org>,
	Andi Kleen <andi-suse@...stfloor.org>
Subject: Re: [BUG] x86 kenel won't boot under Virtual PC

H. Peter Anvin wrote:
> 
> The issue at hand is that at least with the current toolchain, we need 
> to pass -march=generic in order for these instructions to be generated. 
>  We have an option for this, CONFIG_X86_GENERIC, which distributions 
> really *should* be using anyway.
> 

That should have been "-mtune=generic".  Sorry.

> And yes, it should be the default.  The patch I have makes it
> "default y" as well as change the help text.
> 
> Would it make you happier if this option was forced enabled unless 
> CONFIG_EMBEDDED was on?

I guess the other option is to create a new option for selecting the 
dangerous -mtune= variants, and possibly lock *that* option to 
CONFIG_EMBEDDED.

	-hpa
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