linux-kernel - Re: [PATCH -mm] apanel: fix kconfig dependencies

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Message-ID: <20080207174251.1b895234@hyperion.delvare>
Date:	Thu, 7 Feb 2008 17:42:51 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	shemminger@...ux-foundation.org, akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH -mm] apanel: fix kconfig dependencies

Hi Randy,

On Wed, 6 Feb 2008 16:27:54 -0800, Randy Dunlap wrote:
> From: Randy Dunlap <randy.dunlap@...cle.com>
> 
> Add I2C to config since the driver makes several i2c*() calls.

Correct.

> 
> Add PCI to config because the config selects I2C_I801, which depends
> on PCI, but currently config* does not follow dependency chains,
> so randconfig can enable INPUT_APANEL even when PCI is not enabled,
> which leads to these warnings:
> linux-2.6.24-mm1/drivers/i2c/busses/i2c-i801.c:641: error: implicit declaration of function 'pci_request_region'
> /linux-2.6.24-mm1/drivers/i2c/busses/i2c-i801.c:681: error: implicit declaration of function 'pci_release_region'

I'd rather drop the "select I2C_I801" if the config system can't handle
it properly. It's not strictly needed (not a build-time dependency), an
addition to the help text would work as well. Adding dependencies to
make our selections happy is a bit confusing and likely to cause
trouble in the future (as dependencies can change...)

> 
> Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
> ---
>  drivers/input/misc/Kconfig |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- linux-2.6.24-mm1.orig/drivers/input/misc/Kconfig
> +++ linux-2.6.24-mm1/drivers/input/misc/Kconfig
> @@ -42,7 +42,7 @@ config INPUT_M68K_BEEP
>  
>  config INPUT_APANEL
>  	tristate "Fujitsu Lifebook Application Panel buttons"
> -	depends on X86
> +	depends on X86 && I2C && PCI
>  	select I2C_I801
>  	select INPUT_POLLDEV
>  	select CHECK_SIGNATURE


-- 
Jean Delvare
--
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