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To: Jamie Lokier <jamie@shareable.org>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Mutilated form of Andi Kleen's AMD prefetch errata patch
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From: Andi Kleen <ak@suse.de>
Date: 01 Oct 2003 09:24:23 +0200
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Jamie Lokier <jamie@shareable.org> writes:

> It is easy enough to fix by making the fault handler not take
> mmap_sem if the fault's in the kernel address range.  (With apologies
> to the folk running kernel mode userspace...)

It won't work because kernel can cause user space faults
(think get_user). And handling these must be protected.

-Andi