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SubjectRe: [PATCH] Mutilated form of Andi Kleen's AMD prefetch errata patch
> Why is it not sufficient to do something like:
>
> if (!(error_code & 4) && is_prefetch(...))
> return;
>
> near the start of do_page_fault()?

That could fault recursively when the __get_user in is_prefetch faults.
You would have to check the exception table first too.

-Andi
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