linux-kernel - Re: [PATCH] s390/net: lcs: fix build errors when FDDI is a loadable module

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Date:   Thu, 22 Jun 2023 08:36:54 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Alexandra Winter <wintera@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>,
        Simon Horman <simon.horman@...igine.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH] s390/net: lcs: fix build errors when FDDI is a loadable
 module



On 6/22/23 00:15, Alexandra Winter wrote:
> 
> 
> On 21.06.23 23:37, Randy Dunlap wrote:
>> Require FDDI to be built-in if it is used. LCS needs FDDI to be
>> built-in to build without errors.
>>
>> Prevents these build errors:
>> s390-linux-ld: drivers/s390/net/lcs.o: in function `lcs_new_device':
>> drivers/s390/net/lcs.c:2150: undefined reference to `fddi_type_trans'
>> s390-linux-ld: drivers/s390/net/lcs.c:2151: undefined reference to `alloc_fddidev'
>>
>> This FDDI requirement effectively restores the previous condition
>> before the blamed patch, when #ifdef CONFIG_FDDI was used, without
>> testing for CONFIG_FDDI_MODULE.
>>
>> Fixes: 128272336120 ("s390/net: lcs: use IS_ENABLED() for kconfig detection")
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Reported-by: kernel test robot <lkp@...el.com>
>> Link: lore.kernel.org/r/202306202129.pl0AqK8G-lkp@...el.com
>> Suggested-by: Simon Horman <simon.horman@...igine.com>
>> Cc: Alexandra Winter <wintera@...ux.ibm.com>
>> Cc: Wenjia Zhang <wenjia@...ux.ibm.com>
>> Cc: linux-s390@...r.kernel.org
>> Cc: netdev@...r.kernel.org
>> Cc: Heiko Carstens <hca@...ux.ibm.com>
>> Cc: Vasily Gorbik <gor@...ux.ibm.com>
>> Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
>> Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
>> Cc: Sven Schnelle <svens@...ux.ibm.com>
>> Cc: David S. Miller <davem@...emloft.net>
>> Cc: Eric Dumazet <edumazet@...gle.com>
>> Cc: Jakub Kicinski <kuba@...nel.org>
>> Cc: Paolo Abeni <pabeni@...hat.com>
>> ---
>>  drivers/s390/net/Kconfig |    2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff -- a/drivers/s390/net/Kconfig b/drivers/s390/net/Kconfig
>> --- a/drivers/s390/net/Kconfig
>> +++ b/drivers/s390/net/Kconfig
>> @@ -6,11 +6,13 @@ config LCS
>>  	def_tristate m
>>  	prompt "Lan Channel Station Interface"
>>  	depends on CCW && NETDEVICES && (ETHERNET || FDDI)
>> +	depends on FDDI=y || FDDI=n
>>  	help
>>  	  Select this option if you want to use LCS networking on IBM System z.
>>  	  This device driver supports FDDI (IEEE 802.7) and Ethernet.
>>  	  To compile as a module, choose M. The module name is lcs.
>>  	  If you do not know what it is, it's safe to choose Y.
>> +	  If FDDI is used, it must be built-in (=y).
>>  
>>  config CTCM
>>  	def_tristate m
>>
> 
> 
> Wow Randy and Simon, you are reacting faster than I was able to evaluate this yesterday.
> 2 thoughts:
> 
> 1) As ETHERNET cannot be a module and this patch prevents FDDI from being a module, then 
> 128272336120 ("s390/net: lcs: use IS_ENABLED() for kconfig detection")
> is kind of pointless and can as well be reverted instead of doing this fix.
> Or am I missing something?

Hi,
I'll just send a revert for now and then work on the next step(s).

thanks.
-- 
~Randy