linux-kernel - Re: [PATCH] can: let SJA1000 driver depend on HAS

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Date:	Tue, 23 Jun 2009 21:26:11 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
CC:	David Miller <davem@...emloft.net>,
	Oliver Hartkopp <oliver.hartkopp@...kswagen.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] can: let SJA1000 driver depend on HAS_IOMEM

Heiko Carstens wrote:
> From: Heiko Carstens <heiko.carstens@...ibm.com>
> 
> Fixes this compile error on s390:
> 
> drivers/net/can/sja1000/sja1000_platform.c: In function 'sp_read_reg':
> drivers/net/can/sja1000/sja1000_platform.c:42: error: implicit declaration of function 'ioread8'
> drivers/net/can/sja1000/sja1000_platform.c: In function 'sp_write_reg':
> drivers/net/can/sja1000/sja1000_platform.c:47: error: implicit declaration of function 'iowrite8'
> drivers/net/can/sja1000/sja1000_platform.c: In function 'sp_probe':
> drivers/net/can/sja1000/sja1000_platform.c:79: error: implicit declaration of function 'ioremap_nocache'
> 
> Cc: Wolfgang Grandegger <wg@...ndegger.com>
> Cc: Oliver Hartkopp <oliver.hartkopp@...kswagen.de>
> Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
> ---
>  drivers/net/can/Kconfig |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6/drivers/net/can/Kconfig
> ===================================================================
> --- linux-2.6.orig/drivers/net/can/Kconfig
> +++ linux-2.6/drivers/net/can/Kconfig
> @@ -36,7 +36,7 @@ config CAN_CALC_BITTIMING
>  	  If unsure, say Y.
>  
>  config CAN_SJA1000
> -	depends on CAN_DEV
> +	depends on CAN_DEV && HAS_IOMEM
>  	tristate "Philips SJA1000"
>  	---help---
>  	  Driver for the SJA1000 CAN controllers from Philips or NXP

Hm, this Kconfig entry is not directly responsible for building
sja1000_platform.o. It builds sja1000.o, which does not rely on
HAS_IOMEM. It should be added to "config CAN_SJA1000_PLATFORM" instead.
Does the patch below work for you?

Wolfgang.

---
 drivers/net/can/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: net-next-2.6/drivers/net/can/Kconfig
===================================================================
--- net-next-2.6.orig/drivers/net/can/Kconfig
+++ net-next-2.6/drivers/net/can/Kconfig
@@ -42,7 +42,7 @@ config CAN_SJA1000
 	  Driver for the SJA1000 CAN controllers from Philips or NXP

 config CAN_SJA1000_PLATFORM
-	depends on CAN_SJA1000
+	depends on HAS_IOMEM && CAN_SJA1000
 	tristate "Generic Platform Bus based SJA1000 driver"
 	---help---
 	  This driver adds support for the SJA1000 chips connected to


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