linux-kernel - Re: [PATCH] Support conditional deps using "depends on X if Y"

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Message-ID: <e355cd63-77cd-42ac-b852-c789ee8c8869@infradead.org>
Date: Mon, 10 Nov 2025 14:32:39 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Nathan Chancellor <nathan@...nel.org>,
 Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Graham Roff <grahamr@....qualcomm.com>, Nicolas Schier <nsc@...nel.org>,
 Jonathan Corbet <corbet@....net>, linux-kbuild@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 Nicolas Pitre <nico@...xnic.net>
Subject: Re: [PATCH] Support conditional deps using "depends on X if Y"



On 11/10/25 1:15 PM, Nathan Chancellor wrote:
> On Mon, Nov 10, 2025 at 10:48:59AM +0200, Jani Nikula wrote:
>> "depends on A || !A" (or A=n) is the most common pattern in Kconfig,
>> which literally means "depends on A if A".
> 
> That is totally fair, I did not try to actually search for the idiom. I
> will say I do not find that either expression in Kconfig easily
> translates in my head to "this dependency must be built in if the symbol
> is built in, modular if the symbol is modular, or disabled" but I guess
> that is just lack of familiarity with these idioms. I just want it to be
> obvious to folks writing Kconfig when something like this is appropriate
> to use but I guess with that being the most common usage in the tree, it
> is fine as is.

I haven't tested it but it looks reasonable to me.

> I think my point about tests still stands, at least something very
> basic.

Ack.

-- 
~Randy