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

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Message-ID: <48C549AC.1030406@kernel.org>
Date:	Mon, 08 Sep 2008 08:50:04 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.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 The help text is indeed out of date.  I did a patch yesterday to, among 
> other things, update it; I also want to verify that we are disabling all 
> options that can cause gcc or binutils to generate nopl's; I plan to 
> push it today.
> 

OK, turns out that is already happending, by virtue of:

# add at the end to overwrite eventual tuning options from earlier
# cpu entries
cflags-$(CONFIG_X86_GENERIC)    += $(call tune,generic,$(call tune,i686))

-mtune=generic on 32-bit CPUs disable NOPL generation, and any 
gcc/binutils combo too old to have -mtune=generic won't generate them at 
all.

I think I verified this some time in the past, but I just had to refresh 
my memory.  This was a major reason to put this functionality on 
CONFIG_X86_GENERIC.

	-hpa
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