linux-kernel - Re: [PATCH net] net: switchdev: zero-initialize struct switchdev_notifier_fdb_info emitted by drivers towards the bridge

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Message-ID: <20210810081616.wjx6jnlh3qxqsfm2@skbuf>
Date:   Tue, 10 Aug 2021 08:16:17 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
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        Taras Chornyi <tchornyi@...vell.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
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        Vignesh Raghavendra <vigneshr@...com>,
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        Ido Schimmel <idosch@...sch.org>
Subject: Re: [PATCH net] net: switchdev: zero-initialize struct
 switchdev_notifier_fdb_info emitted by drivers towards the bridge

Hi Leon,

On Tue, Aug 10, 2021 at 09:50:41AM +0300, Leon Romanovsky wrote:
> > +	memset(&send_info, 0, sizeof(send_info));
> 
> This can be written simpler.
> struct switchdev_notifier_fdb_info send_info = {};
> 
> In all places.

Because the structure contains a sub-structure, I believe that a
compound literal initializer would require additional braces for the
initialization of its sub-objects too. At least I know that expressions
like that have attracted the attention of clang people in the past:
https://patchwork.ozlabs.org/project/netdev/patch/20190506202447.30907-1-natechancellor@gmail.com/
So I went for the 'unambiguous' path.