linux-kernel - Re: [PATCH 6/7] x86: cleanup dma_*

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Date:	Wed, 13 Aug 2008 14:51:14 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	muli@...ibm.com
Subject: Re: [PATCH 6/7] x86: cleanup dma_*_coherent functions

On Wed, Aug 13, 2008 at 09:45:51AM +0900, FUJITA Tomonori wrote:
> On Tue, 12 Aug 2008 17:24:16 +0200
> Joerg Roedel <joerg.roedel@....com> wrote:
> 
> > All dma_ops implementations support the alloc_coherent and free_coherent
> > callbacks now. This allows a big simplification of the dma_alloc_coherent
> > function which is done with this patch. The dma_free_coherent functions is also
> > cleaned up and calls now the free_coherent callback of the dma_ops
> > implementation.
> > 
> > Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> > ---
> >  arch/x86/kernel/pci-dma.c |  116 ++++-----------------------------------------
> >  1 files changed, 10 insertions(+), 106 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
> > index f704cb5..60fa80d 100644
> > --- a/arch/x86/kernel/pci-dma.c
> > +++ b/arch/x86/kernel/pci-dma.c
> 
> How about moving dma_free_coherent and dma_alloc_coherent to
> asm-x86/dma-mapping.h? It would be nice to have all the dma operations
> in one place.

Actually I thought about the other direction. Having these functions not
inlined should not add a big overhead but reduces kernel code size.

Joerg

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