linux-kernel - Re: [PATCH -mm] ssb: open-code dma_alloc

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Message-Id: <20100214.222446.138687519.davem@davemloft.net>
Date:	Sun, 14 Feb 2010 22:24:46 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	fujita.tomonori@....ntt.co.jp
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, mb@...sch.de,
	stefano.brivio@...imi.it, Larry.Finger@...inger.net,
	akpm@...ux-foundation.org
Subject: Re: [PATCH -mm] ssb: open-code dma_alloc_coherent

From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Date: Mon, 15 Feb 2010 14:21:58 +0900

> From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH -mm] ssb: open-code dma_alloc_coherent
> 
> This removes ssb_dma_alloc_consistent, a wrapper for
> dma_alloc_coherent and pci_alloc_consistent. dma_alloc_coherent
> internally calls pci_alloc_consistent against pci devices so we always
> use dma_alloc_coherent.
> 
> I prefer to use the DMA API directly instead of creating the ssb_dma_
> API. We have been removing any bus specific DMA APIs.
> 
> One disadvantage of this approach that we lost the debugging ability
> of checking the buggy usage of the DMA API against non DMA-capable ssb
> buses. But I guess that the ssb drivers are mature enough and can cope
> with such change?
> 
> I plan to replace all the ssb_dma API if this approach is fine.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>

I'm fine with this:

Acked-by: David S. Miller <davem@...emloft.net>
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