linux-kernel - Re: [PATCH 1/2] ptp_clock: allow for it to be optional

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Message-ID: <20160919142553.3fb682ba@griffin>
Date:   Mon, 19 Sep 2016 14:25:53 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Richard Cochran <richardcochran@...il.com>,
        Josh Triplett <josh@...htriplett.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ptp_clock: allow for it to be optional

On Sun, 18 Sep 2016 23:51:09 -0400, Nicolas Pitre wrote:
> And to make it possible for PTP to be configured out, the select statement
> in the Kconfig entry for those ethernet drivers is changed from selecting
> PTP_1588_CLOCK to PTP_1588_CLOCK_SELECTED whose purpose is to indicate the
> default Kconfig value for the PTP subsystem.

With this patch applied, the user is free to set a NIC driver as built
in and PTP_1588_CLOCK as a module, right? If so, that would lead to
non-functional PTP without any warning due to the use of IS_REACHABLE.
That doesn't sound right. Could easily cause hours of headache to
someone.

Or is this handled somehow?

Thanks,

 Jiri