linux-kernel - Re: [PATCH -next] PCI: endpoint: fix build error, EP NTB driver uses configfs

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Date:   Thu, 4 Feb 2021 19:15:39 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Randy Dunlap <rdunlap@...radead.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: [PATCH -next] PCI: endpoint: fix build error, EP NTB driver uses
 configfs

Hi Lorenzo,

On 04/02/21 3:28 pm, Lorenzo Pieralisi wrote:
> On Tue, Feb 02, 2021 at 12:12:55PM -0800, Randy Dunlap wrote:
>> The pci-epf-ntb driver uses configfs APIs, so it should depend on
>> CONFIGFS_FS to prevent build errors.
>>
>> ld: drivers/pci/endpoint/functions/pci-epf-ntb.o: in function `epf_ntb_add_cfs':
>> pci-epf-ntb.c:(.text+0x1b): undefined reference to `config_group_init_type_name'
>>
>> Fixes: 7dc64244f9e9 ("PCI: endpoint: Add EP function driver to provide NTB functionality")
>>
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: Kishon Vijay Abraham I <kishon@...com>
>> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
>> Cc: linux-pci@...r.kernel.org
>> ---
>> You may switch to 'select CONFIG_FS_FS' if you feel strongly about it.
> 
> Kishon ?

There seems to be some issue in the version that got merged. The v11
patch series had this fixed [1] by using select CONFIGFS_FS. However
whatever was merged seems to be v10 which didn't have select CONFIGFS_FS
[2]. I had sent a private mail to you pointing the same (attached for
reference, not sure if it was delivered).

Thanks
Kishon

[1] ->
https://lore.kernel.org/linux-doc/20210201195809.7342-14-kishon@ti.com/

[2] ->
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/pci/endpoint/functions/Kconfig
> 
> Thanks,
> Lorenzo
> 
>>  drivers/pci/endpoint/functions/Kconfig |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> --- linux-next-20210202.orig/drivers/pci/endpoint/functions/Kconfig
>> +++ linux-next-20210202/drivers/pci/endpoint/functions/Kconfig
>> @@ -16,6 +16,7 @@ config PCI_EPF_TEST
>>  config PCI_EPF_NTB
>>  	tristate "PCI Endpoint NTB driver"
>>  	depends on PCI_ENDPOINT
>> +	depends on CONFIGFS_FS
>>  	help
>>  	  Select this configuration option to enable the NTB driver
>>  	  for PCI Endpoint. NTB driver implements NTB controller

Download attachment "Re: [PATCH v11 13_17] PCI: endpoint: Add EP function driver to provide
 NTB functionality.eml" of type "message/rfc822" (82906 bytes)