linux-kernel - Re: [PATCH net-next] net: phy: link_topology: Don't stub-away the topology creation

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Date: Wed, 17 Apr 2024 23:09:20 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Nathan Chancellor <nathan@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com, Andrew Lunn
 <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Russell King
 <linux@...linux.org.uk>, linux-arm-kernel@...ts.infradead.org, Christophe
 Leroy <christophe.leroy@...roup.eu>, Herve Codina
 <herve.codina@...tlin.com>, Florian Fainelli <f.fainelli@...il.com>, Heiner
 Kallweit <hkallweit1@...il.com>, Vladimir Oltean <vladimir.oltean@....com>,
 Köry Maincent <kory.maincent@...tlin.com>, Jesse Brandeburg
 <jesse.brandeburg@...el.com>, Marek Behún
 <kabel@...nel.org>, Piergiorgio Beruto <piergiorgio.beruto@...il.com>,
 Oleksij Rempel <o.rempel@...gutronix.de>, Nicolò Veronese
 <nicveronese@...il.com>, Simon Horman <horms@...nel.org>,
 mwojtas@...omium.org, Antoine Tenart <atenart@...nel.org>
Subject: Re: [PATCH net-next] net: phy: link_topology: Don't stub-away the
 topology creation

Hello Nathan,

On Wed, 17 Apr 2024 11:07:21 -0700
Nathan Chancellor <nathan@...nel.org> wrote:

> Hi Maxime,
> 
> On Wed, Apr 17, 2024 at 04:27:05PM +0200, Maxime Chevallier wrote:
> > Some of the phy_link_topology operations are protected by IS_REACHABLE,
> > which can lead to scenarios where the consumer, built as modules, sees the topology
> > unstubbed, whereas the initialization didn't occur.
> > 
> > Don't stub away the creation of the topology, it has no dependency on
> > any other parts like phylib, so we can make it always available.
> > 
> > Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> > Closes: https://lore.kernel.org/netdev/2e11b89d-100f-49e7-9c9a-834cc0b82f97@gmail.com/
> > Closes: https://lore.kernel.org/netdev/20240409201553.GA4124869@dev-arch.thelio-3990X/
> > ---
> > Hi Nathan, Heiner,
> > 
> > I'm currently at EOSS, so I'm sending this patch without having been
> > able to properly test it (build-tested only), but as this addresses an
> > issue for people using -next, I'm sending this anyway, sorry about that.  
> 
> No worries, thanks for continuing to take a look. Unfortunately, this
> patch fails to build during the linking stage for me with my
> configuration:
> 
> x86_64-linux-ld: vmlinux.o: in function `free_netdev':
> net/core/dev.c:11060:(.text+0xb14030): undefined reference to `phy_link_topo_destroy'
> x86_64-linux-ld: vmlinux.o: in function `alloc_netdev_mqs':
> net/core/dev.c:10966:(.text+0xb142d6): undefined reference to `phy_link_topo_create'

Heh serves me well for trying to go too fast :) phy_link_topo_create
then need to compile unconditionally, so I'm indeed missing some bits
here.

Thanks a lot for testing,

Maxime

> 
> > Hopefully it can address the issue for now, I haven't given-up on your
> > idea to introduce a config option Heiner :)
> > 
> > Thanks,
> > 
> > Maxime
> > 
> >  include/linux/phy_link_topology_core.h | 15 ---------------
> >  1 file changed, 15 deletions(-)
> > 
> > diff --git a/include/linux/phy_link_topology_core.h b/include/linux/phy_link_topology_core.h
> > index 0a6479055745..61e2592f24ac 100644
> > --- a/include/linux/phy_link_topology_core.h
> > +++ b/include/linux/phy_link_topology_core.h
> > @@ -4,22 +4,7 @@
> >  
> >  struct phy_link_topology;
> >  
> > -#if IS_REACHABLE(CONFIG_PHYLIB)
> > -
> >  struct phy_link_topology *phy_link_topo_create(struct net_device *dev);
> >  void phy_link_topo_destroy(struct phy_link_topology *topo);
> >  
> > -#else
> > -
> > -static inline struct phy_link_topology *phy_link_topo_create(struct net_device *dev)
> > -{
> > -	return NULL;
> > -}
> > -
> > -static inline void phy_link_topo_destroy(struct phy_link_topology *topo)
> > -{
> > -}
> > -
> > -#endif
> > -
> >  #endif /* __PHY_LINK_TOPOLOGY_CORE_H */
> > -- 
> > 2.44.0
> >