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

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Message-Id: <20100623093638R.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 23 Jun 2010 09:38:27 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	James.Bottomley@...senPartnership.com
Cc:	fujita.tomonori@....ntt.co.jp, lethal@...ux-sh.org,
	davem@...emloft.net, mchan@...adcom.com, vapier@...too.org,
	netdev@...r.kernel.org, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: bnx2 fails to compile on parisc because of missing
 get_dma_ops()

On Tue, 22 Jun 2010 12:26:04 -0500
James Bottomley <James.Bottomley@...senPartnership.com> wrote:

> > As I wrote, there is only one user of this API and we can remove it
> > easily. Then I'm not sure it's worth fixing dma_is_consistent() in
> > many architectures. I prefer to add this to
> > feature-removal-schedule.txt to see if driver writers oppose.
> 
> Let me check our two drivers: lasi and 53c700; they're the only ones we
> support on the architecture that can't do any coherence.  I think we
> don't need to tell because the dma_sync_cache calls which replace
> coherent memory handling are indirected on the platform so we don't need
> a global dma_is_coherent() flag.

There is only one place where 53c700 uses dma_is_consistent() (lasi
doesn't use it):

	BUG_ON(!dma_is_consistent(hostdata->dev, pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());

I think that we can remove the above checking since the existing
parisc systems that can't allocate coherent memory pass this checking.

53c700 and lasi call dma_cache_sync() unconditionally so we can live
without dma_is_consistent().
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