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

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Message-ID: <202509031949.375138FB13@keescook>
Date: Wed, 3 Sep 2025 19:51:14 -0700
From: Kees Cook <kees@...nel.org>
To: Vegard Nossum <vegard.nossum@...cle.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 08:44:56PM +0200, Vegard Nossum wrote:
> If you change sym_calc_visibility() to always return 'yes' for
> transitional values then I don't think you need to touch
> sym_calc_value() at all.

Hm, it looks like sym_calc_visibility() doesn't strictly just look at
visibility. And visibility seems to "last"? And I think the "tri" still
can't just be "yes", don't we need the other stuff handled?

Do you see a way to do it how you're suggesting? And now I wrote the
regression tests so we can test any alternatives! ;)

-- 
Kees Cook