linux-kernel - RE: [PATCH net-next 5/5] net: dsa: split dsa

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Date:   Fri, 13 Oct 2017 16:10:50 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Vivien Didelot' <vivien.didelot@...oirfairelinux.com>,
        'Florian Fainelli' <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Andrew Lunn <andrew@...n.ch>,
        "kernel@...oirfairelinux.com" <kernel@...oirfairelinux.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: RE: [PATCH net-next 5/5] net: dsa: split dsa_port's netdev member

From: Vivien Didelot
> Sent: 13 October 2017 16:29
> Vivien Didelot <vivien.didelot@...oirfairelinux.com> writes:
> 
> >>> How about using:
> >>>
> >>> 	union {
> >>> 		struct net_device *master;
> >>> 		struct net_device *slave;
> >>> 	} netdev;
> >> ...
> >>
> >> You can remove the 'netdev' all the compilers support unnamed unions.
> >
> > There are issues with older GCC versions, see the commit 42275bd8fcb3
> > ("switchdev: don't use anonymous union on switchdev attr/obj structs")
> >
> > That's why I kept it in the v2 I sent.
> 
> At the same time, I can see that struct sk_buff uses anonym union a lot.
> 
> It seems weird that one raised a compiler issue for switchdev but not
> for skbuff.h... Do you think it is viable to drop the name here then?

I believe the problem is with initialisers for static structures
that contain anonymous unions.

	David