linux-kernel - Re: [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check

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Date:	Tue, 02 Feb 2010 17:27:10 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	fujita.tomonori@....ntt.co.jp
Cc:	jarkao2@...il.com, alan@...rguk.ukuu.org.uk,
	shemminger@...ux-foundation.org, mbreuer@...jas.com,
	akpm@...ux-foundation.org, flyboy@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	mchan@...adcom.com, pcnet32@...izon.net, romieu@...zoreil.com,
	mcarlson@...adcom.com, James.Bottomley@...e.de
Subject: Re: [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check_sync

From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Date: Wed, 3 Feb 2010 10:18:39 +0900

> Can we safely assume that the arch implementations already round
> up/down to the safe boundary internally in this API (they should
> already)?

I can only speak for sparc64 and x86 directly and those are fine.

Any such improper implementations would fail with many common
ethernet drivers already.

> I don't like two DMA docs. I like to make pci_dma_* API obsolete. We
> have the generic DMA API with generic devices so we are always able to
> use the API (as you did with sbus_map_*). The majority arch
> implementations safely call the bus specific DMA functions via the
> generic DMA API. So there are not many things to do. We can just
> convert pci_dma_* to dma_* API slowly.
> 
> Opinions?

I have no problem with this.
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