linux-kernel - Re: [PATCH 36/56] microblaze

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Date:	Tue, 6 May 2008 11:48:47 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Michal Simek <monstr@...nam.cz>
cc:	John Williams <john.williams@...alogix.com>,
	linux-kernel@...r.kernel.org, arnd@...db.de,
	linux-arch@...r.kernel.org, stephen.neuendorffer@...inx.com,
	John.Linn@...inx.com, matthew@....cx, will.newton@...il.com,
	drepper@...hat.com, microblaze-uclinux@...e.uq.edu.au,
	grant.likely@...retlab.ca, Michal Simek <monstr@...str.eu>
Subject: Re: [PATCH 36/56] microblaze_v2: dma support

On Tue, 6 May 2008, Michal Simek wrote:
> > On Mon, 5 May 2008, John Williams wrote:
> >>> +++ b/include/asm-microblaze/scatterlist.h
> >>> @@ -0,0 +1,21 @@
> >>> +/*
> >>> + * include/asm-microblaze/scatterlist.h
> >>> + *
> >>> + * This file is subject to the terms and conditions of the GNU General Public
> >>> + * License. See the file "COPYING" in the main directory of this archive
> >>> + * for more details.
> >>> + *
> >>> + * Copyright (C) 2006 Atmark Techno, Inc.
> >>> + */
> >>> +
> >>> +#ifndef _ASM_MICROBLAZE_SCATTERLIST_H
> >>> +#define _ASM_MICROBLAZE_SCATTERLIST_H
> >>> +
> >>> +struct scatterlist {
> >>> +	unsigned long page_link;
> >>> +	unsigned int	offset;
> >>> +	dma_addr_t	dma_address;
> >>> +	unsigned int	length;
> >>> +};
> >>> +
> >>> +#endif /* _ASM_MICROBLAZE_SCATTERLIST_H */
> >> Is this worthy of promotion to asm-generic/scatterlist.h?
> > 
> > after moving dma_address one position up in the structure, as dma_addr_t may be
> > 64-bit?
> 
> dma_addr_t is defined in types.h. If your arch want to use 64bit addr, you can
> define it in types.h.

Sorry for not making myself clear: If unsigned long and dma_addr_t are 64-bit,
there may be a hole in between offset and dma_address, due to alignment
restrictions. So it's better to move dma_address up.

As dma_addr_t may be 64-bit even on 32-bit architectures, it may be best
to move it even to the start of the structure.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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