From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Thu, 16 Jul 2009 03:40:18 +0000
Subject: Re: [PATCH 04/15] swiotlb: remove unnecessary swiotlb_bus_to_virt
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To: Becky Bruce <beckyb@kernel.crashing.org>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>, linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, linuxppc-dev@ozlabs.org, tony.luck@intel.com, x86@kernel.org

On Mon, 2009-07-13 at 21:17 -0500, Becky Bruce wrote:
> 
> phys_to_virt (also, virt_to_phys) is invalid for highmem addresses on  
> ppc. 

I would be surprised if x86 was any different here. Most of our highmem
implementation comes straight from x86 :-)

Cheers,
Ben.