From mboxrd@z Thu Jan  1 00:00:00 1970
From: Songmao Tian <tiansm@lemote.com>
Subject: Re: ALSA on MIPS platform
Date: Thu, 09 Aug 2007 09:24:45 +0800
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To: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org, alsa-devel@alsa-project.org, tiwai@suse.de, greg@kroah.com, Atsushi Nemoto <anemo@mba.ocn.ne.jp>, jiankemeng@gmail.com
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Ralf Baechle wrote:
> On Tue, Aug 07, 2007 at 11:01:57PM +0900, Atsushi Nemoto wrote:
>
>   
>> On Tue, 7 Aug 2007 10:18:04 +0400, "Dajie Tan" <jiankemeng@gmail.com> wrote:
>>     
>>>  static inline unsigned long virt_to_phys(volatile const void *address)
>>>  {
>>> -       return (unsigned long)address - PAGE_OFFSET + PHYS_OFFSET;
>>> +       return ((unsigned long)address & 0x1fffffff) + PHYS_OFFSET;
>>>  }
>>>       
>> This makes virt_to_phys() a bit slower, and more importantly, breaks
>> 64-bit kernel.
>>     
>
> It's ALSA that is doing funny things here so there is no point in fixing
> the arch code to work for ALSA.
>
>   Ralf
>
>
>   
arm has made a dma_mmap_coherent, but I don't quite understand the code 
and I am not sure the situation is the same.


Tian