linux-kernel - Re: [PATCH -mm] dma-mapping.h: add the dma

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Date:	Fri, 12 Feb 2010 20:44:05 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-kernel@...r.kernel.org, James.Bottomley@...e.de,
	davem@...emloft.net, jbarnes@...tuousgeek.org, arnd@...db.de
Subject: Re: [PATCH -mm] dma-mapping.h: add the dma_unmap state API

On Sat, 13 Feb 2010 11:49:09 +0900 FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> On Fri, 12 Feb 2010 11:51:57 -0800
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > > -#ifdef CONFIG_NEED_DMA_MAP_STATE
> > > -#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME;
> > > -#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME;
> > 
> > But we already screwed up the semicolon thing.  If you grep the tree you'll
> > see that about half of the users of this macro added their own semicolon:
> 
> Yeah, I know. PCI-DMA-mapping.txt says:
> 
> NOTE: DO NOT put a semicolon at the end of the DECLARE_*() macro.
> 
> 
> But there are some other DECLARE_ macros that don't have the
> semicolons so users could be easily confused.

yup.  Users already got confused.

> #define DEFINE_DMA_MAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
> 
> looks better?

yes.  People expect to have to put the semicolon in there, so they do.

> 
> > ./drivers/net/cxgb3/sge.c:              DECLARE_PCI_UNMAP_ADDR(addr);
> > ./drivers/net/skge.h:   DECLARE_PCI_UNMAP_ADDR(mapaddr);
> > ./drivers/net/qla3xxx.h:         DECLARE_PCI_UNMAP_ADDR(mapaddr);
> > ./drivers/net/qla3xxx.h:         DECLARE_PCI_UNMAP_ADDR(mapaddr);
> > ./drivers/net/tg3.h:    DECLARE_PCI_UNMAP_ADDR(mapping)
> > 
> > 
> > Perhaps someone will clean all that up sometime.
> 
> I plan to replace these PCI API with the new generic API so I can take
> care of them together.

cool.
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