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

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Date:	Thu, 7 Feb 2008 11:04:12 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	shemminger@...ux-foundation.org, akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH -mm] apanel: fix kconfig dependencies

On Thu, 7 Feb 2008 17:42:51 +0100 Jean Delvare wrote:

> 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...)

OK.  What did you have in mind for the help text.  I changed it
a small bit.

I also added "depends on LEDS_CLASS" since defconfig didn't have that
set, but the build failed with wanting symbols that it provides.

Updated patch:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: Randy Dunlap <randy.dunlap@...cle.com>

Add I2C to config since the driver makes several i2c*() calls.

Add to help text that the Intel I2C ICH (i801) driver is also needed
for this kernel.

Add LEDS_CLASS to config since the driver makes les_classdev_*() calls:
ERROR: "led_classdev_register" [drivers/input/misc/apanel.ko] undefined!
ERROR: "__led_classdev_unregister" [drivers/input/misc/apanel.ko] undefined!

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
---
 drivers/input/misc/Kconfig |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- linux-2.6.24-mm1.orig/drivers/input/misc/Kconfig
+++ linux-2.6.24-mm1/drivers/input/misc/Kconfig
@@ -42,14 +42,14 @@ config INPUT_M68K_BEEP
 
 config INPUT_APANEL
 	tristate "Fujitsu Lifebook Application Panel buttons"
-	depends on X86
-	select I2C_I801
+	depends on X86 && I2C && LEDS_CLASS
 	select INPUT_POLLDEV
 	select CHECK_SIGNATURE
 	help
 	 Say Y here for support of the Application Panel buttons, used on
 	 Fujitsu Lifebook. These are attached to the mainboard through
-	 an SMBus interface managed by the I2C Intel ICH (i801) driver.
+	 an SMBus interface managed by the I2C Intel ICH (i801) driver,
+	 which you should also build for this kernel.
 
 	 To compile this driver as a module, choose M here: the module will
 	 be called apanel.
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