linux-kernel - Re: [PATCH] regmap: REGMAP_KUNIT must not select REGMAP

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Message-ID: <36a8dc3b-50bb-4db8-a7eb-bb69517187da@sirena.org.uk>
Date:   Wed, 26 Apr 2023 13:42:45 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     David Gow <davidgow@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regmap: REGMAP_KUNIT must not select REGMAP

On Wed, Apr 26, 2023 at 01:56:44PM +0200, Geert Uytterhoeven wrote:
> Enabling a (modular) test must not silently enable additional kernel
> functionality, as that may increase the attack vector of a product.
> 
> Fix this by making REGMAP_KUNIT depend on REGMAP instead.

This doesn't work since regmap is a selected library so there's no way
to directly enable regmap other than by enabling something that uses it
and it is very likely that the virtual configurations people often use
with KUnit will not have any physical hardware and therefore will not
need regmap.  It seems a lot more likely that someone would want to run
the tests on a platform that doesn't otherwise use regmap than that
someone would end up building in regmap on a production kernel that
wouldn't otherwise have enabled it.

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