linux-kernel - Re: [PATCH v2 08/15] DMA: shdma: move two macros to a header

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Date:	Mon, 22 Jul 2013 00:16:45 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	Magnus Damm <magnus.damm@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Vinod Koul <vinod.koul@...el.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
Subject: Re: [PATCH v2 08/15] DMA: shdma: move two macros to a header

Hi Guennadi,

Thanks for the patch.

On Friday 19 July 2013 18:29:33 Guennadi Liakhovetski wrote:
> Move two generic pointer-conversion macros to a header for common shdma use.
> 
> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
> ---
>  drivers/dma/sh/shdma-base.c |    3 ---
>  drivers/dma/sh/shdma-of.c   |    2 --
>  include/linux/shdma-base.h  |    3 +++
>  3 files changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
> index c5ea256..5b92e72 100644
> --- a/drivers/dma/sh/shdma-base.c
> +++ b/drivers/dma/sh/shdma-base.c
> @@ -36,9 +36,6 @@ enum shdma_desc_status {
> 
>  #define NR_DESCS_PER_CHANNEL 32
> 
> -#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
> -#define to_shdma_dev(d) container_of(d, struct shdma_dev, dma_dev)
> -
>  /*
>   * For slave DMA we assume, that there is a finite number of DMA slaves in
> the * system, and that each such slave can only use a finite number of
> channels. diff --git a/drivers/dma/sh/shdma-of.c
> b/drivers/dma/sh/shdma-of.c index 2acf7b6..80d07b5 100644
> --- a/drivers/dma/sh/shdma-of.c
> +++ b/drivers/dma/sh/shdma-of.c
> @@ -17,8 +17,6 @@
>  #include <linux/platform_device.h>
>  #include <linux/shdma-base.h>
> 
> -#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
> -
>  static struct dma_chan *shdma_of_xlate(struct of_phandle_args *dma_spec,
>  				       struct of_dma *ofdma)
>  {
> diff --git a/include/linux/shdma-base.h b/include/linux/shdma-base.h
> index 31cf89f..45191d7 100644
> --- a/include/linux/shdma-base.h
> +++ b/include/linux/shdma-base.h
> @@ -114,6 +114,9 @@ struct shdma_dev {
>  #define shdma_for_each_chan(c, d, i) for (i = 0, c = (d)->schan[0]; \
>  				i < (d)->dma_dev.chancnt; c = (d)->schan[++i])
> 
> +#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
> +#define to_shdma_dev(d) container_of(d, struct shdma_dev, dma_dev)
> +

While you're at it, it might be a good idea to turn the macros into static 
inline functions. This would help catching type errors at compilation time.

>  int shdma_request_irq(struct shdma_chan *, int,
>  			   unsigned long, const char *);
>  bool shdma_reset(struct shdma_dev *sdev);

-- 
Regards,

Laurent Pinchart

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