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SubjectRe: [PATCH 1/4] Prep for paravirt: Be careful about touching BIOS address space
On Fri, 27 Oct 2006 14:31:41 -0700
Jeremy Fitzhardinge <jeremy@goop.org> wrote:

> Pavel Machek wrote:
> > Indentation is b0rken here.
> >
>
> Oops. How strange.
>
> > And... is get_user right primitive for accessing area that may not be
> > there?
>
> I'm pretty sure there's precedent for using __get_user in this way
> (get_user is a different matter, since it cares about whether the
> address is within the user part of the address space). Certainly in
> arch/i386 code there shouldn't be a problem. Is there some other way to
> achieve the same effect (without manually setting up an exception/fixup
> block)?

It'd be better to use include/linux/uaccess.h:probe_kernel_address() for
this operation.

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