linux-kernel - Re: [PATCH 1/1] device.h: arm,dma-iommu: Move out dma_iommu

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Message-ID: <20140604185926.GB30884@kroah.com>
Date:	Wed, 4 Jun 2014 11:59:26 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Ritesh Harjani <ritesh.harjani@...il.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Russell King <rmk@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] device.h: arm,dma-iommu: Move out dma_iommu_mapping
 struct

On Thu, Jun 05, 2014 at 12:16:28AM +0530, Ritesh Harjani wrote:
> Hi Greg,
> 
> Thanks for reviewing.
> 
> On Wed, Jun 4, 2014 at 11:21 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> > On Wed, Jun 04, 2014 at 01:41:46PM +0530, ritesh.harjani@...il.com wrote:
> >> From: Ritesh Harjani <ritesh.harjani@...il.com>
> >>
> >> This patch moves out *mapping pointer of dma_iommu_mapping
> >> from arch/arm/include/asm/device.h to include/liunux/device.h
> >
> > Why?  Who else can use this becides arm devices?
> 
> Currently only arm and arm64 are the archs at this very moment but
> later other archs can make use of this, as its an arch independent
> code. (Similar to as some arch make use of iommu_area_alloc in
> iommu-helper.c)
> 
> >
> >>
> >> Also, it moves out complete structre definition of dma_iommu_mapping
> >> to include/linux/iommu-helper.h
> >>
> >> This is done since arm iommu's dma-mapping arch independent code,
> >> needs to be moved out to lib/iommu-helper.c, this means
> >> dma_iommu_mapping will be arch independent and later other archs
> >> can make use of it.
> >
> > Will that really happen?  Do you have patches that do that?  I'd prefer
> > to not do stuff like this until you have a patch series that needs it,
> > otherwise this is just unneeded churn.
> 
> Yes, foll link has the patch series, (under review)
> http://www.spinics.net/lists/arm-kernel/msg336896.html

Make this patch 1/3 of that series and resend, I don't want to take this
one if the others are not accepted.

thanks,

greg k-h
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