netdev - Re: [PATCH net-next] dsa: simplify Kconfig symbols and dependencies

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Date:   Sun, 21 Mar 2021 03:03:14 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Alexander Lobakin <alobakin@...me>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] dsa: simplify Kconfig symbols and dependencies

On Fri, Mar 19, 2021 at 03:46:30PM +0000, Alexander Lobakin wrote:
> 1. Remove CONFIG_HAVE_NET_DSA.
>
> CONFIG_HAVE_NET_DSA is a legacy leftover from the times when drivers
> should have selected CONFIG_NET_DSA manually.
> Currently, all drivers has explicit 'depends on NET_DSA', so this is
> no more needed.
>
> 2. CONFIG_HAVE_NET_DSA dependencies became CONFIG_NET_DSA's ones.
>
>  - dropped !S390 dependency which was introduced to be sure NET_DSA
>    can select CONFIG_PHYLIB. DSA migrated to Phylink almost 3 years
>    ago and the PHY library itself doesn't depend on !S390 since
>    commit 870a2b5e4fcd ("phylib: remove !S390 dependeny from Kconfig");
>  - INET dependency is kept to be sure we can select NET_SWITCHDEV;
>  - NETDEVICES dependency is kept to be sure we can select PHYLINK.
>
> 3. DSA drivers menu now depends on NET_DSA.
>
> Instead on 'depends on NET_DSA' on every single driver, the entire
> menu now depends on it. This eliminates a lot of duplicated lines
> from Kconfig with no loss (when CONFIG_NET_DSA=m, drivers also can
> be only m or n).
> This also has a nice side effect that there's no more empty menu on
> configurations without DSA.
>
> 4. Kbuild will now descend into 'drivers/net/dsa' only when
>    CONFIG_NET_DSA is y or m.
>
> This is safe since no objects inside this folder can be built without
> DSA core, as well as when CONFIG_NET_DSA=m, no objects can be
> built-in.
>
> Signed-off-by: Alexander Lobakin <alobakin@...me>
> ---

Thanks!

Reviewed-by: Vladimir Oltean <olteanv@...il.com>