netdev - Re: [PATCH] [net-next] net: enetc: fix link error again

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Date:   Thu, 22 Apr 2021 18:14:51 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Vladimir Oltean <vladimir.oltean@....com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michael Walle <michael@...le.cc>,
        Claudiu Manoil <claudiu.manoil@....com>
Subject: Re: [PATCH] [net-next] net: enetc: fix link error again

On Thu, Apr 22, 2021 at 03:35:11PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> A link time bug that I had fixed before has come back now that
> another sub-module was added to the enetc driver:
> 
> ERROR: modpost: "enetc_ierb_register_pf" [drivers/net/ethernet/freescale/enetc/fsl-enetc.ko] undefined!
> 
> The problem is that the enetc Makefile is not actually used for
> the ierb module if that is the only built-in driver in there
> and everything else is a loadable module.
> 
> Fix it by always entering the directory this time, regardless
> of which symbols are configured. This should reliably fix the
> problem and prevent it from coming back another time.
> 
> Fixes: 112463ddbe82 ("net: dsa: felix: fix link error")
> Fixes: e7d48e5fbf30 ("net: enetc: add a mini driver for the Integrated Endpoint Register Block")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/net/ethernet/freescale/Makefile | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/Makefile b/drivers/net/ethernet/freescale/Makefile
> index 67c436400352..de7b31842233 100644
> --- a/drivers/net/ethernet/freescale/Makefile
> +++ b/drivers/net/ethernet/freescale/Makefile
> @@ -24,6 +24,4 @@ obj-$(CONFIG_FSL_DPAA_ETH) += dpaa/
>  
>  obj-$(CONFIG_FSL_DPAA2_ETH) += dpaa2/
>  
> -obj-$(CONFIG_FSL_ENETC) += enetc/
> -obj-$(CONFIG_FSL_ENETC_MDIO) += enetc/
> -obj-$(CONFIG_FSL_ENETC_VF) += enetc/
> +obj-y += enetc/
> -- 
> 2.29.2
> 

I feel so bad that I'm incapable of troubleshooting even the most
elementary Kconfig issues... I did not even once think of opening that
Makefile.

Acked-by: Vladimir Oltean <vladimir.oltean@....com>