linux-kernel - Re: [PATCH] i2c: sh_mobile: I2C_SH_MOBILE should depend on HAS

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Date:	Wed, 17 Dec 2014 07:58:14 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-i2c@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: sh_mobile: I2C_SH_MOBILE should depend on HAS_DMA

On Mon, Dec 15, 2014 at 02:37:04PM +0100, Geert Uytterhoeven wrote:
> If NO_DMA=y:
> 
> drivers/built-in.o: In function `sh_mobile_i2c_dma_unmap':
> i2c-sh_mobile.c:(.text+0x60de42): undefined reference to `dma_unmap_single'
> drivers/built-in.o: In function `sh_mobile_i2c_xfer_dma':
> i2c-sh_mobile.c:(.text+0x60df22): undefined reference to `dma_map_single'
> i2c-sh_mobile.c:(.text+0x60df2e): undefined reference to `dma_mapping_error'
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Thanks for spotting this. However, since DMA is opt-in, isn't this
dependency too much? I can't think of anything better than #ifdeffing
the code, though.

> ---
>  drivers/i2c/busses/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index c1351d9fb35bbc8d..f08dd20f625c184d 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -753,6 +753,7 @@ config I2C_SH7760
>  
>  config I2C_SH_MOBILE
>  	tristate "SuperH Mobile I2C Controller"
> +	depends on HAS_DMA
>  	depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
>  	help
>  	  If you say yes to this option, support will be included for the
> -- 
> 1.9.1
> 

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