linux-kernel - Re: [PATCH] alpha: compile fixes

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Message-ID: <20090129074101.GA13020@jurassic.park.msu.ru>
Date:	Thu, 29 Jan 2009 10:41:01 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	akpm@...ux-foundation.org, rth@...ddle.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] alpha: compile fixes

On Wed, Jan 28, 2009 at 11:53:45AM +0900, FUJITA Tomonori wrote:
> A patch to change Alpha to handle two dma mapping implementations
> (pci-noop and the IOMMU) in the standard way (like X86, POWER, IA64,
> etc do) is acceptable?
> 
> pci-noop has something like struct dma_map_ops nommu_dma_ops (similar
> to pci-nommu.c in arch/x86/kernel/pci-nommu.c) and pci_iommu.c has
> struct dma_map_ops iommu_dma_ops. Then at startup, the kernel properly
> sets dma_ops pointer to nommu_dma_ops or iommu_dma_ops.
> 
> Then we can handle the dma mapping operations in the consistent way,
> e.g., dma_map_sg can be just `return ops->map_sg(dev, sg, nents,
> dir)`.

I don't think that we need this. In GENERIC kernel, alpha dma-mapping
functions work universally, Jensen included. The only reason pci-noop.c
is there is an optimization for kernel built specifically for Jensen,
which is the only non-PCI alpha - we simply don't compile useless stuff in.

Ivan.
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