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

[Andrew Morton]

Jamie Lokier <jamie@xxxxxxxxxxxxx> 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.

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