netdev - Re: [PATCH v3 net] ionic: fix ptp support config breakage

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Date:   Thu, 6 May 2021 17:48:43 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, drivers@...sando.io,
        Allen Hubbe <allenbh@...sando.io>
Subject: Re: [PATCH v3 net] ionic: fix ptp support config breakage

On 5/6/21 5:21 PM, Randy Dunlap wrote:
> On 5/6/21 5:15 PM, Jakub Kicinski wrote:
>> On Wed,  5 May 2021 21:18:46 -0700 Shannon Nelson wrote:
>>> Driver link failed with undefined references in some
>>> kernel config variations.
>> This is really vague and the patch is not very obvious.
>>
>>>   ionic-y := ionic_main.o ionic_bus_pci.o ionic_devlink.o ionic_dev.o \
>>>   	   ionic_debugfs.o ionic_lif.o ionic_rx_filter.o ionic_ethtool.o \
>>> -	   ionic_txrx.o ionic_stats.o ionic_fw.o
>>> -ionic-$(CONFIG_PTP_1588_CLOCK) += ionic_phc.o
>>> +	   ionic_txrx.o ionic_stats.o ionic_fw.o ionic_phc.o
>> So we'd replace a build dependency..
>>
>>> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_phc.c b/drivers/net/ethernet/pensando/ionic/ionic_phc.c
>>> index a87c87e86aef..30c78808c45a 100644
>>> --- a/drivers/net/ethernet/pensando/ionic/ionic_phc.c
>>> +++ b/drivers/net/ethernet/pensando/ionic/ionic_phc.c
>>> @@ -1,6 +1,8 @@
>>>   // SPDX-License-Identifier: GPL-2.0
>>>   /* Copyright(c) 2017 - 2021 Pensando Systems, Inc */
>>>   
>>> +#if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
>>> +
>>>   #include <linux/netdevice.h>
>>>   #include <linux/etherdevice.h>
>>>   
>>> @@ -613,3 +615,4 @@ void ionic_lif_free_phc(struct ionic_lif *lif)
>>>   	devm_kfree(lif->ionic->dev, lif->phc);
>>>   	lif->phc = NULL;
>>>   }
>>> +#endif /* IS_ENABLED(CONFIG_PTP_1588_CLOCK) */
>> .. with an ifdef around an entire file? Does not feel very clean.
>>
>> The construct of using:
>>
>> 	drv-$(CONFIG_PTP_1588_CLOCK) += ptp.o
>>
>> seems relatively common, why does it now work here?
>>
>> Maybe the config in question has PTP as a module and ionic built in?
>> Then you should add depends on PTP_1588_CLOCK || !PTP_1588_CLOCK.
>>
>> Maybe somehow the "ionic-y" confuses kbuild and it should be ionic-objs?
>>
>> At the very least we need a better explanation in the commit message.
>>
> I'll take a look if someone can point me to the .config file.
>

These are the notes I got from kernel test robot:
https://lore.kernel.org/lkml/202105041020.efEaBOYC-lkp@intel.com/
https://lore.kernel.org/lkml/202105041154.GrLZmjGh-lkp@intel.com/
https://lore.kernel.org/lkml/202105041634.paURyDp0-lkp@intel.com/
https://lore.kernel.org/lkml/202105050636.UXXDl7m2-lkp@intel.com/

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