linux-kernel - Re: [PATCH 5/5] sparc: use asm-generic/pci-dma-compat

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Date:	Mon, 6 Jul 2009 10:21:28 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	davem@...emloft.net, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, reif@...thlink.net
Subject: Re: [PATCH 5/5] sparc: use asm-generic/pci-dma-compat

On Monday 06 July 2009, FUJITA Tomonori wrote:

> --- a/arch/sparc/include/asm/pci_64.h
> +++ b/arch/sparc/include/asm/pci_64.h
> -/* Return whether the given PCI device DMA address mask can
> - * be supported properly.  For example, if your device can
> - * only drive the low 24-bits during PCI bus mastering, then
> - * you would pass 0x00ffffff as the mask to this function.
> - */
> -extern int pci_dma_supported(struct pci_dev *hwdev, u64 mask);
> -
>  /* PCI IOMMU mapping bypass support. */
>  
>  /* PCI 64-bit addressing works for all slots on all controller
> --- a/arch/sparc/kernel/iommu.c
> +++ b/arch/sparc/kernel/iommu.c
> @@ -840,6 +840,8 @@ static struct dma_map_ops sun4u_dma_ops = {
>  struct dma_map_ops *dma_ops = &sun4u_dma_ops;
>  EXPORT_SYMBOL(dma_ops);
>  
> +extern int pci64_dma_supported(struct pci_dev *pdev, u64 device_mask);
> +
>  int dma_supported(struct device *dev, u64 device_mask)
>  {
>  	struct iommu *iommu = dev->archdata.iommu;

Minor nitpicking: The declaration should better be left in the header
file to avoid extern declarations in C files.

	Arnd <><
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