linux-kernel - Re: [PATCH v2] kconfig: Add transitional symbol attribute for migration support

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Message-ID: <202509010945.D266C0E6@keescook>
Date: Mon, 1 Sep 2025 09:48:54 -0700
From: Kees Cook <kees@...nel.org>
To: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Jonathan Corbet <corbet@....net>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>, Arnd Bergmann <arnd@...db.de>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
	Miguel Ojeda <ojeda@...nel.org>,
	Stephen Brennan <stephen.s.brennan@...cle.com>,
	Marco Bonelli <marco@...eim.net>, Petr Vorel <pvorel@...e.cz>,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] kconfig: Add transitional symbol attribute for
 migration support

On Mon, Sep 01, 2025 at 12:09:14PM +0300, Jani Nikula wrote:
> On Fri, 29 Aug 2025, Kees Cook <kees@...nel.org> wrote:
> > The transitional syntax requires a type argument and prevents type
> > redefinition:
> >
> >     config OLD_OPTION
> >         transitional bool
> >         help
> >           Transitional config for OLD_OPTION migration.
> 
> How long do you think we'll need to keep the transitional config options
> around? Forever?

As with the "manual" transitions, it'd probably be until the next LTS is
released.

-- 
Kees Cook