linux-kernel - Re: [PATCH net] net: dsa: ocelot: add dependency for NET_DSA_MSCC

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Date:   Tue, 19 Nov 2019 15:41:25 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     maowenan@...wei.com
Cc:     vladimir.oltean@....com, claudiu.manoil@....com, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: ocelot: add dependency for
 NET_DSA_MSCC_FELIX

From: Mao Wenan <maowenan@...wei.com>
Date: Tue, 19 Nov 2019 10:51:28 +0800

> If CONFIG_NET_DSA_MSCC_FELIX=y, and CONFIG_NET_VENDOR_MICROSEMI=n,
> below errors can be found:
> drivers/net/dsa/ocelot/felix.o: In function `felix_vlan_del':
> felix.c:(.text+0x26e): undefined reference to `ocelot_vlan_del'
> drivers/net/dsa/ocelot/felix.o: In function `felix_vlan_add':
> felix.c:(.text+0x352): undefined reference to `ocelot_vlan_add'
> 
> and warning as below:
> WARNING: unmet direct dependencies detected for MSCC_OCELOT_SWITCH
> Depends on [n]: NETDEVICES [=y] && ETHERNET [=y] &&
> NET_VENDOR_MICROSEMI [=n] && NET_SWITCHDEV [=y] && HAS_IOMEM [=y]
> Selected by [y]:
> NET_DSA_MSCC_FELIX [=y] && NETDEVICES [=y] && HAVE_NET_DSA [=y]
> && NET_DSA [=y] && PCI [=y]
> 
> This patch add dependency NET_VENDOR_MICROSEMI for NET_DSA_MSCC_FELIX.
> 
> Fixes: 56051948773e ("net: dsa: ocelot: add driver for Felix switch family")
> Signed-off-by: Mao Wenan <maowenan@...wei.com>

This seems more like a "select" situation, why in the world should the
user be required to know about NET_VENDOR_MISCROSEMI at all for this
driver?

And NET_VENDOR_MICROSEMI does _NOT_ enable any code at all, you have
to enable the individual drivers guarded by NET_VENDOR_MICROSEMI in order
to resolve the symbols necessary for ocelot.

I'm not applying this, it isn't correct.

Thank you.