linux-kernel - Re: [PATCH -mm 2/5] asm-generic: add NEED_SG_DMA_LENGTH to define sg_dma

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Message-Id: <20100406090434K.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 6 Apr 2010 09:05:02 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	fujita.tomonori@....ntt.co.jp
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	arnd@...db.de
Subject: Re: [PATCH -mm 2/5] asm-generic: add NEED_SG_DMA_LENGTH to define
 sg_dma_len()

On Tue, 6 Apr 2010 08:46:38 +0900
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> On Mon, 5 Apr 2010 16:35:41 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Sun,  4 Apr 2010 23:25:50 +0900
> > FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> > 
> > > There are only two ways to define sg_dma_len(); use sg->dma_length or
> > > sg->length. This patch introduces NEED_SG_DMA_LENGTH that enables
> > > architectures to choose sg->dma_length or sg->length.
> > 
> > i386 allnoconfig:
> > 
> > arch/x86/kernel/pci-nommu.c: In function 'nommu_map_sg':
> > arch/x86/kernel/pci-nommu.c:71: error: 'struct scatterlist' has no member named 'dma_length'
> > 
> > So I enabled NEED_SG_DMA_LENGTH on x86_32 as well.  It compiles...
> 
> Sorry about that. The fix is fine by me. We can remove dma_length in
> pci-nommu.c though (there is no point of setting dma_length here).

Oops, I forgot that pci-nommu.c is also used on x86_64.

There is no point of setting dma_length here on x86_32 but we need to
do on x86_64 since x86_64 uses dma_length. Your fix is correct.

Sorry again.
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