linux-kernel - Re: [PATCH net-next 3/9] net: dsa: allow the DSA master to be seen and changed through rtnetlink

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Message-ID: <20220901132903.yidpk3v4wrm4hfu4@skbuf>
Date:   Thu, 1 Sep 2022 13:29:04 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Marek Behún <kabel@...nel.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        DENG Qingfang <dqfext@...il.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>
Subject: Re: [PATCH net-next 3/9] net: dsa: allow the DSA master to be seen
 and changed through rtnetlink

On Wed, Aug 31, 2022 at 08:50:20PM -0700, Jakub Kicinski wrote:
> net/dsa/port.c: In function ‘dsa_port_change_master’:
> net/dsa/port.c:1414:13: warning: unused variable ‘port’ [-Wunused-variable]
>  1414 |         int port = dp->index;
>       |             ^~~~

I did build patch by patch, but in the sea of stuff that got rebuilt
when I modified include/uapi/linux/if_link.h, I couldn't notice anything.

> I presume you had a look around what side effects setting rtnl_link_ops
> will have? Should .netns_refund be true?

I'm not quite sure what other side effects there will be. The netns_refund
property should be set to true, yes.