linux-kernel - Re: [PATCH -mm 06/12] m68k: use asm-generic/scatterlist.h

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Date:	Sun, 25 Apr 2010 22:46:35 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	geert@...ux-m68k.org
Cc:	fujita.tomonori@....ntt.co.jp, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, zippel@...ux-m68k.org,
	linux-m68k@...r.kernel.org
Subject: Re: [PATCH -mm 06/12] m68k: use asm-generic/scatterlist.h

On Fri, 23 Apr 2010 10:29:04 +0200
Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> > +#include <asm-generic/scatterlist.h>
> 
> This include should be ...
> 
> > /* This is bogus and should go away. */
> > #define ISA_DMA_THRESHOLD (0x00ffffff)

asm-generic/scatterlist.h can't define ISA_DMA_THRESHOLD because of
the way POWERPC uses ISA_DMA_THRESHOLD.


> ... below this definition, else you get duplicate definition errors
> (and the wrong definition).
> 
> > -#define sg_dma_address(sg) ((sg)->dma_address)
> > -#define sg_dma_len(sg) ((sg)->length)

This patch needs to be applied against -mm; including some changes to
asm-generic/scatterlist.h.

I've attached asm-generic/scatterlist.h in -mm.

=
#ifndef __ASM_GENERIC_SCATTERLIST_H
#define __ASM_GENERIC_SCATTERLIST_H

#include <linux/types.h>

struct scatterlist {
#ifdef CONFIG_DEBUG_SG
	unsigned long	sg_magic;
#endif
	unsigned long	page_link;
	unsigned int	offset;
	unsigned int	length;
	dma_addr_t	dma_address;
#ifdef CONFIG_NEED_SG_DMA_LENGTH
	unsigned int	dma_length;
#endif
};

/*
 * These macros should be used after a dma_map_sg call has been done
 * to get bus addresses of each of the SG entries and their lengths.
 * You should only work with the number of sg entries pci_map_sg
 * returns, or alternatively stop on the first sg_dma_len(sg) which
 * is 0.
 */
#define sg_dma_address(sg)	((sg)->dma_address)

#ifdef CONFIG_NEED_SG_DMA_LENGTH
#define sg_dma_len(sg)		((sg)->dma_length)
#else
#define sg_dma_len(sg)		((sg)->length)
#endif

#endif /* __ASM_GENERIC_SCATTERLIST_H */
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