linux-kernel - Re: [PATCH 2/4] dma/ia64: update ia64 machvecs

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Date:	Wed, 30 Jan 2008 11:25:58 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	akepner@....com
Cc:	Tony Luck <tony.luck@...el.com>,
	Grant Grundler <grundler@...isc-linux.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jes Sorensen <jes@....com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Roland Dreier <rdreier@...co.com>,
	David Miller <davem@...emloft.net>,
	Muli Ben-Yehuda <muli@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] dma/ia64: update ia64 machvecs

In general, the patches look reasonable to me.  Just an observation:

On Tue, 2008-01-29 at 21:52 -0800, akepner@....com wrote:
> diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h
> index e69de29..31af292 100644
> --- a/include/linux/dma-attrs.h
> +++ b/include/linux/dma-attrs.h
> @@ -0,0 +1,48 @@
> +#ifndef _DMA_ATTR_H
> +#define _DMA_ATTR_H
> +#ifdef ARCH_USES_DMA_ATTRS
> +
> +enum dma_attr {
> +       DMA_ATTR_BARRIER,
> +       DMA_ATTR_FOO,
> +       DMA_ATTR_GOO,
> +       DMA_ATTR_MAX,
> +};
> +

The attribute names (DMA_ATTR_...) are going to have to live somewhere
outside of the #ifdef ARCH_USES_DMA_ATTRS otherwise we'll get compile
failures of drivers using attributes on architectures that don't support
them.

Secondly, DMA_ATTR_BARRIER doesn't quite sound right.  What you're
actually doing is trying to prescribe strict ordering, so shouldn't this
be something like DMA_ATTR_STRICT_ORDERING (and perhaps with a
corresponding DMA_ATTR_RELAXED_ORDERING for the PCIe case).  also,
strike the DMA_ATTR_FOO and DMA_ATTR_GOO since they have no plausible
meaning.

James

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