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

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Date:   Thu, 6 May 2021 17:15:29 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     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 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.