netdev - Re: [PATCH net-next v10 08/13] ptp: Add phc source and helpers to register specific PTP clock or get information

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Date: Sun, 14 Apr 2024 12:33:48 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Kory Maincent <kory.maincent@...tlin.com>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Andrew Lunn <andrew@...n.ch>, 
 Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Richard Cochran <richardcochran@...il.com>, 
 Radu Pirea <radu-nicolae.pirea@....nxp.com>, 
 Jay Vosburgh <j.vosburgh@...il.com>, 
 Andy Gospodarek <andy@...yhouse.net>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Jonathan Corbet <corbet@....net>, 
 Horatiu Vultur <horatiu.vultur@...rochip.com>, 
 UNGLinuxDriver@...rochip.com, 
 Simon Horman <horms@...nel.org>, 
 Vladimir Oltean <vladimir.oltean@....com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, 
 Maxime Chevallier <maxime.chevallier@...tlin.com>, 
 Rahul Rameshbabu <rrameshbabu@...dia.com>
Subject: Re: [PATCH net-next v10 08/13] ptp: Add phc source and helpers to
 register specific PTP clock or get information

Kory Maincent wrote:
> On Wed, 10 Apr 2024 23:00:53 -0400
> Willem de Bruijn <willemdebruijn.kernel@...il.com> wrote:
> 
> > > +/**
> > > + * netdev_ptp_clock_register() - register a PTP hardware clock driver for
> > > + *				 a net device
> > > + *
> > > + * @info: Structure describing the new clock.
> > > + * @dev:  Pointer of the net device
> > > + */
> > > +
> > > +extern struct ptp_clock *
> > > +netdev_ptp_clock_register(struct ptp_clock_info *info,
> > > +			  struct net_device *dev);  
> > 
> > No need for explicit extern?
> 
> Indeed I don't think it is needed.
> I am wondering why few other functions uses it (ptp_clock_register,
> ptp_clock_event, ptp_clock_index). Do you know?

Perhaps it predates the coding style rule

    Do not use the ``extern`` keyword with function declarations as this makes
    lines longer and isn't strictly necessary.