linux-kernel - Re: [PATCH v2 -mm 01/14] adds include/linux/pci-dma.h

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Date:	Fri, 12 Feb 2010 15:04:41 +0000
From:	David Howells <dhowells@...hat.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, x86@...nel.org,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Tony Luck <tony.luck@...el.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Kyle McMartin <kyle@...artin.ca>, Helge Deller <deller@....de>,
	James Bottomley <James.Bottomley@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Zankel <chris@...kel.net>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 -mm 01/14] adds include/linux/pci-dma.h

FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> This patch adds include/linux/pci-dma.h that defines the pci_unmap
> state API:
> 
> DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
> DECLARE_PCI_UNMAP_LEN(LEN_NAME)
> pci_unmap_addr(PTR, ADDR_NAME)
> pci_unmap_addr_set(PTR, ADDR_NAME, VAL)
> pci_unmap_len(PTR, LEN_NAME)
> pci_unmap_len_set(PTR, LEN_NAME, VAL)
> 
> This enables us to remove lots of the duplication in architecture
> implementations since there are only two ways to define the API.
> 
> If architectures define CONFIG_NEED_DMA_MAP_STATE, they get the real
> definition of pci_unmap state API. If not, they get the noop
> definition.
> 
> In the long term, it's better to replace the API with the generic
> device model API such as DECLARE_DMA_UNMAP_ADDR. We can map the API to
> the generic one (like dma-mapping-compat.h does). This patch also
> makes the migration process easier. We can remove this file after the
> migration.
> 
> It might be simpler to add the API to include/linux/pci.h but looks
> it's already too large. We'll remove pci-dma.h after finishing moving
> to the generic device model. So I put the API to a separate file.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>

Acked-by: David Howells <dhowells@...hat.com>
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