linux-kernel - Re: [PATCH] DMA: PL330: add missing header

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Date:	Thu, 25 Aug 2011 20:08:08 +0530
From:	"Koul, Vinod" <vinod.koul@...el.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Dan <dan.j.williams@...el.com>
Cc:	Boojin Kim <boojin.kim@...sung.com>, linux-kernel@...r.kernel.org,
	'Kukjin Kim' <kgene.kim@...sung.com>
Subject: Re: [PATCH] DMA: PL330: add missing header

On Tue, 2011-08-23 at 16:27 +0530, Koul, Vinod wrote:
> On Tue, 2011-08-23 at 10:39 +0100, Russell King - ARM Linux wrote:
> > On Tue, Aug 23, 2011 at 02:02:47PM +0530, Koul, Vinod wrote:
> > > On Tue, 2011-08-23 at 09:23 +0100, Russell King - ARM Linux wrote:
> > > > On Tue, Aug 23, 2011 at 01:45:42PM +0530, Koul, Vinod wrote:
> > > > > Russell had fixed compilation of pl330 driver, and was supposed to send
> > > > > the fix to Linus as part of his fixes. If thats not done I can send it
> > > > > for next -rc
> > > > 
> > > > That was for amba-pl08x.c, not pl330.c
> > > Okay, thanks.
> > > I will send the patch for dmaengine.h to Linus for next -rc
> > 
> > If you read the original commit, you'll find that scatterlist.h was
> > explicitly removed from dmaengine.h:
> > 
> >     net: remove mm.h inclusion from netdevice.h
> > 
> >     Remove linux/mm.h inclusion from netdevice.h -- it's unused (I've checked ma
> > 
> >     To prevent mm.h inclusion via other channels also extract "enum dma_data_dir
> >     definition into separate header. This tiny piece is what gluing netdevice.h
> >     via "netdevice.h => dmaengine.h => dma-mapping.h => scatterlist.h => mm.h".
> >     Removal of mm.h from scatterlist.h was tried and was found not feasible
> >     on most archs, so the link was cutoff earlier.
> > 
> >     Hope people are OK with tiny include file.
> > 
> >     Note, that mm_types.h is still dragged in, but it is a separate story.
> > 
> >     Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> >     Signed-off-by: David S. Miller <davem@...emloft.net>
> > 
> > So adding scatterlist.h back into dmaengine.h may not be the best idea.
> Yes, looks like that maybe the case. 
> 
> It's rather unfortunate that neither Dan nor me were copied on changes
> done on dmaengine drivers and headers :(
Anyway now we have added the new API of dmaengine_prep_slave_single()
which needs scatterlist.h, any attempt to remove scatterlist wont work.
Either we have to include this in dmaengine.h or any other driver (like
netdevice.h) which includes dmaengine.h


-- 
~Vinod

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