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

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Date:   Thu, 6 May 2021 18:12:29 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Shannon Nelson <snelson@...sando.io>,
        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 5:48 PM, Shannon Nelson wrote:
> 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/

At first glance it looks like Jakub's suggestion of
>>> 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.

is what is needed, but I'm still doing build testing ATM.


-- 
~Randy