linux-kernel - Re: [PATCH v9 07/17] h8300: miscellaneous functions

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Message-ID: <87h9s0vdih.wl-ysato@users.sourceforge.jp>
Date:	Tue, 28 Apr 2015 17:54:46 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH v9 07/17] h8300: miscellaneous functions

At Mon, 27 Apr 2015 10:57:10 +0200,
Arnd Bergmann wrote:
> 
> On Monday 27 April 2015 14:35:14 Yoshinori Sato wrote:
> > +void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
> > +				size_t size, enum dma_data_direction dir)
> > +{
> > +}
> > +EXPORT_SYMBOL(dma_sync_single_for_device);
> > +
> > +void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
> > +			    int nents, enum dma_data_direction dir)
> > +{
> > +	int i;
> > +
> > +	for (i = 0; i < nents; sg++, i++)
> > +		dma_sync_single_for_device(dev, sg->dma_address,
> > +					   sg->length, dir);
> > +}
> > +EXPORT_SYMBOL(dma_sync_sg_for_device);
> > +
> > +dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
> > +			  enum dma_data_direction dir)
> > +{
> > +	dma_addr_t handle = virt_to_bus(addr);
> > +
> > +	dma_sync_single_for_device(dev, handle, size, dir);
> > +	return handle;
> > +}
> > +EXPORT_SYMBOL(dma_map_single);
> 
> 
> As this all doesn't do anything, and your dma-mapping.h header explains
> that the architecture is cache-coherent, just remove these functions,
> and replace them with empty 'static inline' helpers in that header.
> 
> 	Arnd
> 

OK.
This DMA support part too old.
I will rewriting.
Thanks.

-- 
Yoshinori Sato
<ysato@...rs.sourceforge.jp>
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