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Subject: Re: Why is CONFIG_VT forced on?
To:     Rob Landley <rob@landley.net>, linux-kernel@vger.kernel.org
References: <9b79fb95-f20c-f299-f568-0ffb60305f04@landley.net>
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 <ac0e5b3b-6e70-6ab0-0c7f-43175b73058f@landley.net>
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 <018540ef-0327-78dc-ea5c-a43318f1f640@landley.net>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <0ce685c3-a14e-0cc9-1c9c-4673bfab2e25@infradead.org>
Date:   Mon, 30 Dec 2019 18:00:08 -0800
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On 12/30/19 5:45 PM, Rob Landley wrote:
> On 12/30/19 6:59 PM, Randy Dunlap wrote:
>> #
>> # Character devices
>> #
>> CONFIG_TTY=y
>> # CONFIG_VT is not set
>>
>> But first you must set/enable EXPERT.  See the bool prompt.
> 
> Wait, the if doesn't _disable_ the symbol? It disables _editability_ of the
> symbol, but the symbol can still be on (and displayed) when the if is false?

Yes, displayed but not edited.

> (Why would...)
> 
> Ok. Thanks for pointing that out. Any idea why the menuconfig help text has no
> mention of this?

Hm, it's disappointing that EXPERT is not mentioned there somewhere,
when using menuconfig or nconfig.
When using xconfig, and selecting "Virtual terminal" VT, xconfig help does say:

type: bool
unknown property: symbol
    dep: TTY && !UML
prompt: Virtual terminal
    dep: TTY && !UML && EXPERT <<<<< so the prompt depends on EXPERT
select: INPUT
    dep: TTY && !UML
default: y
    dep: TTY && !UML


-- 
~Randy