Re: ALSA on MIPS platform

[Songmao Tian <tiansm@lemote.com>]

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