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From:   Arnd Bergmann <arnd@kernel.org>
Date:   Thu, 5 Aug 2021 16:10:17 +0200
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Subject: Re: [PATCH net-next v4] ethernet: fix PTP_1588_CLOCK dependencies
To:     Vladimir Oltean <olteanv@gmail.com>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Richard Cochran <richardcochran@gmail.com>,
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On Thu, Aug 5, 2021 at 3:32 PM Vladimir Oltean <olteanv@gmail.com> wrote:
> >
> >  # Users should depend on NET_SWITCHDEV, HAS_IOMEM, BRIDGE
> >  config MSCC_OCELOT_SWITCH_LIB
> > +     depends on PTP_1588_CLOCK_OPTIONAL
>
> No, don't make the MSCC_OCELOT_SWITCH_LIB depend on anything please,
> since it is always "select"-ed, it shouldn't have dependencies, see
> the comment above. If you want, add this to the comment: "Users should
> depend on (...), PTP_1588_CLOCK_OPTIONAL".
>

Changed now, but I only saw your message after I had already sent out v5 of
the patch. I'll hold off on sending v6 for the moment, in case someone else
notices something odd.

I generally prefer having the extra dependencies like this, because it documents
what the requirement is, and causes a config-time warning before the kernel
runs into a link failure when someone else gets the dependency wrong later.
I don't feel too strongly about it though, and I don't expect adding a comment
would help much either here, so I'm leaving it without that line.

       Arnd