linux-kernel - Re: Why is CONFIG

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Message-ID: <20191231022859.GB4203@ZenIV.linux.org.uk>
Date:   Tue, 31 Dec 2019 02:28:59 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Rob Landley <rob@...dley.net>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Why is CONFIG_VT forced on?

On Mon, Dec 30, 2019 at 06:30:15PM -0600, Rob Landley wrote:
> On x86-64 menuconfig, CONFIG_VT is forced on (in drivers->char devices->virtual
> terminal), but the help doesn't mention a "selects", and I didn't spot anything
> obvious in "find . -name 'Kconfig*' | xargs grep -rw VT".
> 
> Congratulations, you've reinvented "come from". I'm mostly familiar with the
> kconfig plumbing from _before_ you made it turing complete: how do I navigate this?
> 
> I'm guessing "stick printfs into the menuconfig binary" is the recommended next
> step for investigating this? Or is there a trick I'm missing?

config VT
        bool "Virtual terminal" if EXPERT

IOW, it's only conrollable if EXPERT is set.  Finding CONFIG_EXPERT, setting it
and turning CONFIG_VT off is left as an exercise for reader; ceasing the
indignant whining for long enough to do that might or might not be doable -
up to you.