linux-kernel - Re: [PATCH] dma_declare_coherent_memory: push ioremap() up to caller

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Date:	Fri, 24 Dec 2010 09:02:10 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Janusz Krzysztofik <jkrzyszt@....icnet.pl>,
	linux-arch@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-sh@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
	linux-usb@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	linux-media@...r.kernel.org,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	linux-scsi@...r.kernel.org,
	"James E.J. Bottomley" <James.Bottomley@...e.de>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH] dma_declare_coherent_memory: push ioremap() up to caller

On Thu, Dec 23, 2010 at 11:54:34PM +0000, Russell King - ARM Linux wrote:
> On Fri, Dec 24, 2010 at 12:20:32AM +0100, Janusz Krzysztofik wrote:
> > The patch tries to implement a solution suggested by Russell King, 
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2010-December/035264.html. 
> > It is expected to solve video buffer allocation issues for at least a 
> > few soc_camera I/O memory less host interface drivers, designed around 
> > the videobuf_dma_contig layer, which allocates video buffers using 
> > dma_alloc_coherent().
> > 
> > Created against linux-2.6.37-rc5.
> > 
> > Tested on ARM OMAP1 based Amstrad Delta with a WIP OMAP1 camera patch, 
> > patterned upon two mach-mx3 machine types which already try to use the 
> > dma_declare_coherent_memory() method for reserving a region of system 
> > RAM preallocated with another dma_alloc_coherent(). Compile tested for 
> > all modified files except arch/sh/drivers/pci/fixups-dreamcast.c.
> > 
> > Signed-off-by: Janusz Krzysztofik <jkrzyszt@....icnet.pl>
> > ---
> > I intended to quote Russell in my commit message and even asked him for 
> > his permission, but since he didn't respond, I decided to include a link 
> > to his original message only.
> 
> There's no problem quoting messages which were sent to public mailing
> lists, especially when there's a record of what was said in public
> archives too.
> 
> I think this is definitely a step forward.
> 
The -tip folks have started using LKML-Reference tags to help with this,
although I don't believe its usage is officially documented anywhere.
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