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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