linux-kernel - Re: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86

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Date:	Wed, 16 May 2007 20:16:11 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Christian <haveaniceday@...sv.de>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64

On Wed, 16 May 2007, H. Peter Anvin wrote:
> 
> It gets turned on by the code in arch/i386/kernel/cpu.  It's just that
> the new code that Andi added runs during setup, i.e. in real mode, so
> *way* earlier than that.

Ahh. Do we really need it that early?

Now, it's easy enough to just turn off CONFIG_X86_CMPXCHG64 (it really 
should be "8B" instead of "64", but that's another issue) for those 
things, and nobody should really care, but still, maybe we could re-do the 
early bits to be more polite to those VIA CPU's?

I thought the cmpxchg8b stuff was just used to page table setup. Do those 
things even _support_ PAE?

What else uses it? Early setup in real mode? What am I missing? My grep 
powers are waning..

		Linus
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