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Date: Mon, 16 Jul 2007 11:09:09 -0500
From: Scott Wood <scottwood@freescale.com>
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To: Siva Prasad <sprasad@bivio.net>
Subject: Re: Linuxppc-embedded Digest, Vol 35, Issue 33
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Siva Prasad wrote:
> It returns kernel virtual address. If you use this buffer space for DMA,
> please use appropriate flags. You may use __pa(address) or
> virt_to_phys() to convert virtual to physical.

No, you may not -- physical and DMA addresses are not always identical. 
  Use the DMA mapping API.

-Scott