netdev - Re: [PATCH net-next] net: pcs: xpcs: depends on PHYLINK in Kconfig

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Date:   Wed, 22 Jun 2022 15:50:31 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, 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>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH net-next] net: pcs: xpcs: depends on PHYLINK in Kconfig

On Tue, 2022-06-21 at 12:50 -0700, Jakub Kicinski wrote:
> On Tue, 21 Jun 2022 09:55:35 +0200 Paolo Abeni wrote:
> > This is another attempt at fixing:
> > 
> > > > ERROR: modpost: "phylink_mii_c22_pcs_encode_advertisement" [drivers/net/pcs/pcs_xpcs.ko] undefined!
> > > > ERROR: modpost: "phylink_mii_c22_pcs_decode_state" [drivers/net/pcs/pcs_xpcs.ko] undefined!  
> > 
> > We can't select PHYLINK, or that will trigger a circular dependency
> > PHYLINK already selects PHYLIB, which in turn selects MDIO_DEVICE:
> > replacing the MDIO_DEVICE dependency with PHYLINK will pull all the
> > required configs.
> 
> We can't use depends with PHYLINK, AFAIU, because PHYLINK is not 
> a user-visible knob. Its always "select"ed and does not show up
> in {x,n,menu}config.

So I guess we should resort to 'select'ing all the needed dependencies
(we can't mix select and depend on, as per kconfig documentation)

I'll give it another shot before surrender

Thanks!

Paolo