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

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Date:   Thu, 6 May 2021 17:21:56 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jakub Kicinski <kuba@...nel.org>,
        Shannon Nelson <snelson@...sando.io>
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 5:15 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.

-- 
~Randy