linux-kernel - Re: [PATCH 2/5] sparc: use asm-generic/dma-mapping-common.h

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Date:	Thu, 9 Jul 2009 18:55:30 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	davem@...emloft.net
Cc:	arnd@...db.de, fujita.tomonori@....ntt.co.jp,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	reif@...thlink.net
Subject: Re: [PATCH 2/5] sparc: use asm-generic/dma-mapping-common.h

On Mon, 06 Jul 2009 18:11:31 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Arnd Bergmann <arnd@...db.de>
> Date: Mon, 6 Jul 2009 10:26:28 +0200
> 
> > On Monday 06 July 2009, FUJITA Tomonori wrote:
> >> +static inline struct dma_map_ops *get_dma_ops(struct device *dev)
> >> +{
> >> +       return dma_ops;
> >> +}
> >> +
> >> +#define flush_write_buffers()
> >> +
> >> +#include <asm-generic/dma-mapping-common.h>
> > 
> > I still think the flush_write_buffers() x86-ism should not be required
> > to use dma-mapping-common.h and only be used in arch/x86/kernel/pci-nommu.c
> > so you don't have to add dummy definitions to all architectures.
> > 
> > See http://lkml.org/lkml/2009/6/30/134
> > 
> > Otherwise, your series looks good!
> 
> Since we have until the 2.6.32 merge window to merge this, why
> don't we take care of this flush_write_buffers() thing first?
>
> I'm completely fine with these changes otherwise, thanks!

The logic to move flush_write_buffers() from dma-mapping-common.h to
arch/x86/kernel/pci-nommu.c makes sense and it doesn't break anything.
However, I'd like to see the confirmation from a person who added
flush_write_buffers() long ago. I thought that we might overlook
something subtle.

I'll put Arnd's patch in the next submission if you like.


btw, Robert asked me about the dma-debug feature so I uploaded the new
version (I also found and fixed one bug wrt dma_{alloc|free}_coherent
for pci devices on SPARC32):

git://git.kernel.org/pub/scm/linux/kernel/git/tomo/linux-2.6-misc.git sparc
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