Re: [PATCH] Mutilated form of Andi Kleen's AMD prefetch errata patch

Andrew Morton
2003-10-01T14:51:25Z

Jamie Lokier <jamie@shareable.org> wrote:
>
> > What about the 4G+4G split?
>
> Whoever is looking after the 4G+4G patch can deal with it, presumably.
> It'll be the same condition ad 4G+4G uses to decide if it's an access
> to userspace (needing a search of the vma list), or not.

It should "just work". 4G+4G is false advertising:

#ifdef CONFIG_X86_4G_VM_LAYOUT
#define __PAGE_OFFSET (0x02000000)
#define TASK_SIZE (0xff000000)
#else

I'm a bit confused as to what significance the faulting address has btw:
kernel code can raise prefetch faults against addresses which are less
than, and presumably greater than TASK_SIZE.