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From:   Ralf Baechle <ralf@linux-mips.org>
To:     loody <miloody@gmail.com>
Cc:     "Maciej W. Rozycki" <macro@linux-mips.org>,
        Linux MIPS Mailing List <linux-mips@linux-mips.org>
Subject: Re: some question about wmb in mips
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On Mon, Aug 30, 2010 at 09:58:27PM +0800, loody wrote:

> after reading the DMA api document and check the source code.
> I found mips seems not implement "dma map ops", but x86 has implemented it.
> What are they used for and why mips don't implement it?

This is useful for multiple sets of methods on more complicated systems.
Right now we just don't need that.

  Ralf