linux-kernel - Re: [PATCH] mtd: Make MTD_BCM47XXSFLASH to depend on MIPS

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Message-ID: <20151014162504.GG107187@google.com>
Date:	Wed, 14 Oct 2015 09:25:04 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	linux-kernel@...r.kernel.org,
	Fengguang Wu <fengguang.wu@...el.com>,
	Luis de Bethencourt <luisbg@....samsung.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Jeremy Kerr <jk@...abs.org>, linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>,
	Neelesh Gupta <neelegup@...ux.vnet.ibm.com>,
	Cyril Bur <cyrilbur@...il.com>,
	Rafał Miłecki <zajec5@...il.com>
Subject: Re: [PATCH] mtd: Make MTD_BCM47XXSFLASH to depend on MIPS

+ Rafał

On Wed, Oct 14, 2015 at 11:04:54AM +0200, Javier Martinez Canillas wrote:
> The bcm47xxsflash driver uses the KSEG0ADDR() function to map an address
> to a certain kernel segment. But that is only defined if the MIPS config
> symbol is enabled. The driver does not have an explicit dependency on it
> and relies on a transitive dependency relation:
> 
> MTD_BCM47XXSFLASH -> BCMA_SFLASH -> BCMA_DRIVER_MIPS -> BCMA && MIPS
> 
> But BCMA_SFLASH and BCMA_DRIVER_MIPS have only runtime and not buildtime
> dependency with MIPS so can be changed to be built test using the config
> COMPILE_TEST symbol. But that would make MTD_BCM47XXSFLASH be built with
> MIPS not enabled and cause the following build error:
> 
> drivers/mtd/devices//bcm47xxsflash.c: In function 'bcm47xxsflash_read':
> drivers/mtd/devices//bcm47xxsflash.c:112:2: error: implicit declaration of function 'KSEG0ADDR' [-Werror=implicit-function-declaration]
>   memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
>   ^
> 
> Make MTD_BCM47XXSFLASH depend on MIPS since has a buildtime dependency.
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> 
> ---
> 
>  drivers/mtd/devices/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig
> index f73c41697a00..f5eab3c19356 100644
> --- a/drivers/mtd/devices/Kconfig
> +++ b/drivers/mtd/devices/Kconfig
> @@ -114,7 +114,7 @@ config MTD_SST25L
>  
>  config MTD_BCM47XXSFLASH
>  	tristate "R/O support for serial flash on BCMA bus"
> -	depends on BCMA_SFLASH
> +	depends on BCMA_SFLASH && MIPS
>  	help
>  	  BCMA bus can have various flash memories attached, they are
>  	  registered by bcma as platform devices. This enables driver for
> -- 
> 2.4.3
> 
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