linux-kernel - Re: sg_dma_address and sg_dma

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Message-Id: <1166042700.14800.392.camel@brick.pathscale.com>
Date:	Wed, 13 Dec 2006 12:45:00 -0800
From:	Ralph Campbell <ralph.campbell@...gic.com>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: sg_dma_address and sg_dma_len

On Wed, 2006-12-13 at 09:37 -0800, Luck, Tony wrote:
> Ralph,
> 
> I'm seeing dozens of build warnings and errors on ia64 from
> infiniband.  According to git you touched it last, so even
> if you aren't to blame, you are by definition an expert :-)
> 
> E.g.
> 
> In file included from include/rdma/ib_addr.h:37,
>                  from drivers/infiniband/core/addr.c:39:
> include/rdma/ib_verbs.h: In function `ib_sg_dma_address':
> include/rdma/ib_verbs.h:1572: warning: implicit declaration of function `sg_dma_address'
> include/rdma/ib_verbs.h: In function `ib_sg_dma_len':
> include/rdma/ib_verbs.h:1584: warning: implicit declaration of function `sg_dma_len'
> 
> Adding a #include <linux/pci.h> would shut them up (as the defines for
> sg_dma_address and sg_dma_len are in asm/pci.h) ... but I've no idea
> whether this is the right fix.
> 
> -Tony

For some reason ia64 defines sg_dma_address() in include/asm-ia64/pci.h
instead of include/asm-ia64/scatterlist.h like most other architectures.

Since pci.h includes <asm/scatterlist.h> it seems like the fix would be
to move the two lines:
	#define sg_dma_len(sg)          ((sg)->dma_length)
	#define sg_dma_address(sg)      ((sg)->dma_address)
to include/asm-ia64/scatterlist.h

Now that I look, I see asm-sh64/pci.h and asm-frv/dma-mapping.h
would also need to be changed.

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