linux-kernel - Re: [PATCH 2/3] dma: redefine dma_flags_set/get

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Message-Id: <20071016202904.8e9d505b.akpm@linux-foundation.org>
Date:	Tue, 16 Oct 2007 20:29:04 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
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>,
	James Bottomley <James.Bottomley@...eleye.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dma: redefine dma_flags_set/get_*() for sn-ia64

On Tue, 16 Oct 2007 18:43:16 -0700 akepner@....com wrote:

> @@ -153,7 +153,7 @@ EXPORT_SYMBOL(sn_dma_free_coherent);
>   * @dev: device to map for
>   * @cpu_addr: kernel virtual address of the region to map
>   * @size: size of the region
> - * @direction: DMA direction
> + * @flags: DMA direction, and arch-specific attributes
>   *
>   * Map the region pointed to by @cpu_addr for DMA and return the
>   * DMA address.
> @@ -167,17 +167,23 @@ EXPORT_SYMBOL(sn_dma_free_coherent);
>   *       figure out how to save dmamap handle so can use two step.
>   */
>  dma_addr_t sn_dma_map_single(struct device *dev, void *cpu_addr, size_t size,
> -			     int direction)
> +			     int flags)
>  {
>  	dma_addr_t dma_addr;
>  	unsigned long phys_addr;
>  	struct pci_dev *pdev = to_pci_dev(dev);
>  	struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
> +	int dmabarrier = dma_flags_get_attr(flags) & DMA_BARRIER_ATTR;

So we take an `enum data_direction' and then wedge it into a word alongside
some extra flags?

Can we do something nicer than that?
-
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