linux-kernel - Re: [PATCH v2] Support conditional deps using "depends on X if Y"

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Message-ID: <19f6c99dfcc2a9c2ca4c43ba0ad352fc978c1cc9@intel.com>
Date: Fri, 05 Dec 2025 11:06:56 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Graham Roff <grahamr@....qualcomm.com>, Nathan Chancellor
 <nathan@...nel.org>, Nicolas Schier <nsc@...nel.org>, Jonathan Corbet
 <corbet@....net>
Cc: linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, Nicolas Pitre <nico@...xnic.net>, Graham
 Roff <grahamr@....qualcomm.com>
Subject: Re: [PATCH v2] Support conditional deps using "depends on X if Y"

On Tue, 18 Nov 2025, Graham Roff <grahamr@....qualcomm.com> wrote:
> @@ -602,8 +612,14 @@ Some drivers are able to optionally use a feature from another module
>  or build cleanly with that module disabled, but cause a link failure
>  when trying to use that loadable module from a built-in driver.
>  
> -The most common way to express this optional dependency in Kconfig logic
> -uses the slightly counterintuitive::
> +The recommended way to express this optional dependency in Kconfig logic
> +uses the conditional form::
> +
> +  config FOO
> +	tristate "Support for foo hardware"
> +	depends on BAR if BAR
> +
> +This slightly counterintuitive style is also widely used::
>  
>    config FOO
>  	tristate "Support for foo hardware"

Thanks for adding this documentation hunk.


BR,
Jani.


-- 
Jani Nikula, Intel