linux-kernel - Re: [PATCH] ata: libata depends on HAS

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Date:	Mon, 18 May 2009 19:45:09 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	arnd@...db.de
Cc:	htejun@...il.com, fujita.tomonori@....ntt.co.jp,
	hancockrwd@...il.com, alan@...rguk.ukuu.org.uk, flar@...andria.com,
	schmitz@...phys.uni-duesseldorf.de, linux-kernel@...r.kernel.org,
	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	takata@...ux-m32r.org, geert@...ux-m68k.org,
	linux-m68k@...r.kernel.org, ysato@...rs.sourceforge.jp
Subject: Re: [PATCH] ata: libata depends on HAS_DMA

On Fri, 15 May 2009 13:16:30 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> On Friday 15 May 2009, Tejun Heo wrote:
> > FUJITA Tomonori wrote:
> > > Can libata call dma_supported() per device to decide DMA or PIO mode?
> > > Then, we can solve this problem by add dummy DMA API (just calls BUG)
> > > on such architectures, without Kconfig magic or adding ifdef (like the
> > > old ide stack does), I think.
> 
> That would be the !CONFIG_PCI half of the old
> include/asm-generic/dma-mapping.h file that you just removed,
> right?

No.

The old include/asm-generic/dma-mapping.h is a workaround for lazy
architecture maintainers who have not converted pci_* API to dma_*
API.
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