netdev - Re: [PATCH 3/9] net: bgmac: clarify CONFIG

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Date:	Wed, 27 Jan 2016 11:11:10 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	"David S. Miller" <davem@...emloft.net>,
	<linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
	Michael Chan <mchan@...adcom.com>,
	Rajesh Borundia <Rajesh.Borundia@...gic.com>,
	Rasesh Mody <rasesh.mody@...gic.com>,
	Rafał Miłecki <zajec5@...il.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/9] net: bgmac: clarify CONFIG_BCMA dependency

[[PATCH 3/9] net: bgmac: clarify CONFIG_BCMA dependency] On 27/01/2016 (Wed 15:04) Arnd Bergmann wrote:

> The bgmac driver depends on BCMA_HOST_SOC, which is only used
> when CONFIG_BCMA is enabled. However, it is a bool option and can
> be set when CONFIG_BCMA=m, and then bgmac can be built-in, leading
> to an obvious link error:
> 
> drivers/built-in.o: In function `bgmac_init':
> :(.init.text+0x7f2c): undefined reference to `__bcma_driver_register'
> drivers/built-in.o: In function `bgmac_exit':
> :(.exit.text+0x110a): undefined reference to `bcma_driver_unregister'
> 
> To avoid this case, we need to depend on both BCMA and BCMA_SOC,
> as this patch does. I'm also trying to make the dependency more
> readable by splitting it into three lines, and adding a COMPILE_TEST
> alternative so we can test-build it in all configurations that
> support BCMA.

It wasn't immediately clear to me from the above why you added the
select on FIXED_PHY.

P.
--

> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/net/ethernet/broadcom/Kconfig | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/Kconfig b/drivers/net/ethernet/broadcom/Kconfig
> index 8550df189ceb..19f7cd02e085 100644
> --- a/drivers/net/ethernet/broadcom/Kconfig
> +++ b/drivers/net/ethernet/broadcom/Kconfig
> @@ -151,8 +151,11 @@ config BNX2X_VXLAN
>  
>  config BGMAC
>  	tristate "BCMA bus GBit core support"
> -	depends on BCMA_HOST_SOC && HAS_DMA && (BCM47XX || ARCH_BCM_5301X)
> +	depends on BCMA && BCMA_HOST_SOC
> +	depends on HAS_DMA
> +	depends on BCM47XX || ARCH_BCM_5301X || COMPILE_TEST
>  	select PHYLIB
> +	select FIXED_PHY
>  	---help---
>  	  This driver supports GBit MAC and BCM4706 GBit MAC cores on BCMA bus.
>  	  They can be found on BCM47xx SoCs and provide gigabit ethernet.
> -- 
> 2.7.0
>