linux-kernel - Re: bnx2 fails to compile on parisc because of missing get_dma

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Message-Id: <20100617211946A.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 17 Jun 2010 21:21:13 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mchan@...adcom.com
Cc:	davem@...emloft.net, lethal@...ux-sh.org, vapier@...too.org,
	JBottomley@...ell.com, netdev@...r.kernel.org,
	linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp
Subject: Re: bnx2 fails to compile on parisc because of missing
 get_dma_ops()

On Wed, 16 Jun 2010 23:24:44 -0700
"Michael Chan" <mchan@...adcom.com> wrote:

> Michael Chan wrote:
> >
> > Paul Mundt wrote:
> >
> > > If you want to have a micro-optimization for the consistent DMA
> > > case, you can check dma_is_consistent(), which is part of the API and
> > > will be variable on certain platform configurations (ie, some may be
> > > consistent with PCI but not on other busses, etc.)
> > >
> > >
> >
> > Thanks for the tip.  I didn't know about the dma_is_consistent() API.
> > I'll use this to fix it then.
> >
> 
> David, why is dma_is_consistent() always returning 1 on sparc?  The
> streaming DMA is not consistent.

I think that there are some confusion about dma_is_consistent(). Some
architectures think that dma_is_consistent() is supposed to return 1
if they can allocate coherent memory (note that some architectures
can't allocate coherent memory).
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