linux-kernel - Re: [PATCH -tip v2 0/5] add common functions for struct dma_map

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Message-Id: <20090528163853Q.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 28 May 2009 16:44:56 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	akpm@...ux-foundation.org
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	mingo@...e.hu, tony.luck@...el.com, linux-ia64@...r.kernel.org,
	arnd@...db.de, joerg.roedel@....com
Subject: Re: [PATCH -tip v2 0/5] add common functions for struct dma_map_ops

Thanks for picking up the patchset,

On Thu, 28 May 2009 00:20:20 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Fri, 15 May 2009 12:55:00 +0900 FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > We unified x86 and IA64's handling of multiple dma mapping operations
> > (struct dma_map_ops in linux/dma-mapping.h) so we can remove
> > duplication in their arch/include/asm/dma-mapping.h.
> > 
> > This patchset adds include/asm-generic/dma-mapping-common.h that
> > provides some generic dma mapping function definitions for the users
> > of struct dma_map_ops. This enables us to remove about 100 lines. This
> > also enables us to easily add CONFIG_DMA_API_DEBUG support, which only
> > x86 supports for now. The 4th patch adds CONFIG_DMA_API_DEBUG support
> > to IA64 by adding only 8 lines.
> > 
> > This is against tip/master since tip has some changes to
> > arch/x86/include/asm/dma-mapping.h.
> > 
> > The changes since the first version are
> > 
> > - fixed a bug that dma_attrs is not passed properly (thanks to Arnd
> > Bergmann).
> > 
> > - used a new name, dma-mapping-common.h, instead of dma-mapping.h
> > (suggested by Arnd Bergmann).
> > 
> > - added Joerg's Acked-by
> > 
> > =
> >  arch/ia64/Kconfig                        |    1 +
> >  arch/ia64/include/asm/dma-mapping.h      |  110 ++----------------
> >  arch/x86/Kconfig                         |    1 +
> >  arch/x86/include/asm/dma-mapping.h       |  174 +---------------------------
> >  include/asm-generic/dma-mapping-common.h |  190 ++++++++++++++++++++++++++++++
> >  lib/dma-debug.c                          |   82 ++++++++------
> >  6 files changed, 252 insertions(+), 306 deletions(-)
> 
> I'm hoping that a suitable merge scheme here would be for me to merge
> 1/5 into mainline then to send 2/5 to Ingo and 3/5, 4/5 and 5/5 to Tony
> for merging.  Will that all compile and work?

Yes, it works. The X86 patch (2/5) and the IA64 patches (3/5, 4/5, and
5/5) can be merged independently. Both depends on the first patch (1/5).


> Alternatively I can merge the lot, with suitable acking.

It would be easier, I think.

Thanks,
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