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

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Date:   Mon, 19 Sep 2016 14:09:39 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Josh Triplett <josh@...htriplett.org>
cc:     Jiri Benc <jbenc@...hat.com>, John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Richard Cochran <richardcochran@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 1/2] ptp_clock: allow for it to be optional

On Mon, 19 Sep 2016, Josh Triplett wrote:

> But it does seem unfortunate that this can't happen at build time via
> Kconfig.  CCing linux-kbuild in case someone has an idea for how to fix
> this.

I hoped something like this could work:

config FOO
	prompt "Blah-blah"
	tristate if (BAR != y)
	bool if (BAR = y)
	default BAR

This way FOO could be y, m or n when BAR is m or n, otherwise FOO could 
be y or n only.

But that didn't work.


Nicolas