linux-kernel - Re: [PATCH] xillybus: XILLYBUS_OF should depend on HAS

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Date:	Fri, 24 Apr 2015 15:42:32 +0300
From:	Eli Billauer <eli.billauer@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xillybus: XILLYBUS_OF should depend on HAS_DMA

Hello Geert,

Thanks for this. The dependency on HAS_DMA is obviously missing (is 
there any real platform that uses OF but has HAS_DMA off? Sounds a bit 
esoteric to me).

And if we're at it, I now realize that XILLYBUS_PCIE maybe also should 
depend on HAS_DMA, in case PCI is enabled but HAS_DMA isn't...?

I don't maintain a git repository of my own -- Greg applies my patches 
into char-next when I have any (doesn't happen very often). So I suppose 
this should be Cced to the maintainers of "CHAR and MISC DRIVERS" (that 
is, Greg and Arnd). Preferably with a "char: xillybus:" prefix in the 
title, I guess.

Thanks & regards,
    Eli


On 23/04/15 21:05, Geert Uytterhoeven wrote:
> If NO_DMA=y:
>
>      drivers/built-in.o: In function `xilly_of_unmap':
>      xillybus_of.c:(.text+0xa860e): undefined reference to `dma_unmap_single'
>      drivers/built-in.o: In function `xilly_map_single_of':
>      xillybus_of.c:(.text+0xa8668): undefined reference to `dma_map_single'
>      xillybus_of.c:(.text+0xa8676): undefined reference to `dma_mapping_error'
>      xillybus_of.c:(.text+0xa86ca): undefined reference to `dma_unmap_single'
>      drivers/built-in.o: In function `xilly_dma_sync_single_for_device_of':
>      xillybus_of.c:(.text+0xa8700): undefined reference to `dma_sync_single_for_cpu'
>      drivers/built-in.o: In function `xilly_dma_sync_single_for_cpu_of':
>      xillybus_of.c:(.text+0xa8726): undefined reference to `dma_sync_single_for_cpu'
>
> Signed-off-by: Geert Uytterhoeven<geert@...ux-m68k.org>
> ---
>   drivers/char/xillybus/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/char/xillybus/Kconfig b/drivers/char/xillybus/Kconfig
> index b53bdf12da0d0fe3..b302684d86c14c06 100644
> --- a/drivers/char/xillybus/Kconfig
> +++ b/drivers/char/xillybus/Kconfig
> @@ -24,7 +24,7 @@ config XILLYBUS_PCIE
>
>   config XILLYBUS_OF
>   	tristate "Xillybus over Device Tree"
> -	depends on OF_ADDRESS&&  OF_IRQ
> +	depends on OF_ADDRESS&&  OF_IRQ&&  HAS_DMA
>   	help
>   	  Set to M if you want Xillybus to find its resources from the
>   	  Open Firmware Flattened Device Tree. If the target is an embedded
>    

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