linux-kernel - Re: [PATCH] dmaengine: provide dummy functions for DMA

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Date:	Thu, 23 Dec 2010 08:00:33 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Dan Williams <dan.j.williams@...el.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: provide dummy functions for DMA_ENGINE=n

On Wed, 22 Dec 2010, Dan Williams wrote:

> On Wed, Dec 22, 2010 at 4:13 PM, Guennadi Liakhovetski
> <g.liakhovetski@....de> wrote:
> > On Wed, 22 Dec 2010, Dan Williams wrote:
> >
> >> On Wed, Dec 22, 2010 at 5:46 AM, Guennadi Liakhovetski
> >> <g.liakhovetski@....de> wrote:
> >> > This lets drivers, optionally using the dmaengine, build with DMA_ENGINE
> >> > unselected.
> >> >
> >> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
> >> > ---
> >> >  include/linux/dmaengine.h |   13 ++++++++++---
> >> >  1 files changed, 10 insertions(+), 3 deletions(-)
> >>
> >> Is this fixing build errors, or is this just relieving drivers from
> >> needing to surround calls to dma_{request|release}_channel() with
> >> ifdef CONFIG_DMA_ENGINE?  The former makes this more urgent, the
> >> latter can wait for the next merge window.
> >
> > sh_mmcif.c doesn't compile, if configured for DMA, but DMA_ENGINE is
> > unselected. So, yes, this wants to be fixed. But there's more than one way
> > to fix it. I've chosen this one, as it seems more generic to me.
> >
> 
> Yes, it's the right fix.  I was just trying to see if it needs to go
> in now and if there were any implications for -stable.  Unless I am
> missing something drivers/mmc/host/sh_mmcif.c does not even include
> dmaengine.h today so this can wait until the 2.6.38 window.

Right, sorry, DMA support for sh_mmcif.c is only coming in 2.6.38, it's 
currently in next.

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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