linux-kernel - Re: [PATCH 1/1] Drivers/media/radio: Fix build error

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Date:	Sun, 01 Apr 2012 12:35:59 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Hans Verkuil <hverkuil@...all.nl>
CC:	Tracey Dent <tdent48227@...il.com>, linux-kernel@...r.kernel.org,
	shea@...alevy.com, torvalds@...ux-foundation.org,
	mchehab@...radead.org, hans.verkuil@...co.com,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 1/1] Drivers/media/radio: Fix build error

On 04/01/2012 12:24 PM, Hans Verkuil wrote:

> On Sunday, April 01, 2012 21:09:34 Tracey Dent wrote:
>> radio-maxiradio depends on SND_FM801_TEA575X_BOOL to build or will
>> result in an build error such as:
>>
>> Kernel: arch/x86/boot/bzImage is ready  (#1)
>> ERROR: "snd_tea575x_init" [drivers/media/radio/radio-maxiradio.ko] undefined!
>> ERROR: "snd_tea575x_exit" [drivers/media/radio/radio-maxiradio.ko] undefined!
>> WARNING: modpost: Found 6 section mismatch(es).
>> To see full details build your kernel with:
>> 'make CONFIG_DEBUG_SECTION_MISMATCH=y'
>> make[1]: *** [__modpost] Error 1
>> make: *** [modules] Error 2
>>
>> Select CONFIG_SND_TEA575X to fixes problem and enable
>> the driver to be built as desired.
>>
>> v2:
>> instead of selecting CONFIG_SND_FM801_TEA575X_BOOL, select
>> CONFIG_SND_TEA575X, which in turns selects CONFIG_SND_FM801_TEA575X_BOOL
>> and any other dependencies for it to build.

Tracey,

'select' does not follow its dependency chain.  See
Documentation/kbuild/kconfig-language.txt:

  Note:
	select should be used with care. select will force
	a symbol to a value without visiting the dependencies.
	By abusing select you are able to select a symbol FOO even
	if FOO depends on BAR that is not set.
	In general use select only for non-visible symbols
	(no prompts anywhere) and for symbols with no dependencies.
	That will limit the usefulness but on the other hand avoid
	the illegal configurations all over.


> No, this is the correct patch:


Thanks.


> diff --git a/sound/pci/Kconfig b/sound/pci/Kconfig
> index 8816804..5ca0939 100644
> --- a/sound/pci/Kconfig
> +++ b/sound/pci/Kconfig
> @@ -2,8 +2,8 @@
>  
>  config SND_TEA575X
>  	tristate
> -	depends on SND_FM801_TEA575X_BOOL || SND_ES1968_RADIO || RADIO_SF16FMR2
> -	default SND_FM801 || SND_ES1968 || RADIO_SF16FMR2
> +	depends on SND_FM801_TEA575X_BOOL || SND_ES1968_RADIO || RADIO_SF16FMR2 || RADIO_MAXIRADIO
> +	default SND_FM801 || SND_ES1968 || RADIO_SF16FMR2 || RADIO_MAXIRADIO
>  
>  menuconfig SND_PCI
>  	bool "PCI sound devices"
> 
> RADIO_MAXIRADIO should be treated just like RADIO_SF16FMR2, I just didn't
> realize at the time that it had to be added as a SND_TEA575X dependency.
> 
> Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
> 
> (Sorry for the late reply, I didn't have access to my cisco email for the last
> few days).
> 
> Regards,
> 
> 	Hans
> 
>>
>> Reported-by: Shea Levy <shea@...alevy.com>
>> Signed-off-by: Tracey Dent <tdent48227@...il.com>
>> ---
>>  drivers/media/radio/Kconfig |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
>> index 8db2d7f..b518ce5 100644
>> --- a/drivers/media/radio/Kconfig
>> +++ b/drivers/media/radio/Kconfig
>> @@ -44,6 +44,7 @@ config USB_DSBR
>>  config RADIO_MAXIRADIO
>>  	tristate "Guillemot MAXI Radio FM 2000 radio"
>>  	depends on VIDEO_V4L2 && PCI && SND
>> +	select SND_TEA575X
>>  	---help---
>>  	  Choose Y here if you have this radio card.  This card may also be
>>  	  found as Gemtek PCI FM.
>>
> --


-- 
~Randy
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