[PATCH] dma_declare_coherent_memory: push ioremap() up to caller

[lethal@linux-sh.org (Paul Mundt)]

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@tis.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.