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Date:   Fri, 15 Jan 2021 09:54:37 +1100 (AEDT)
From:   Finn Thain <fthain@telegraphics.com.au>
To:     Arnd Bergmann <arnd@kernel.org>
cc:     John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        Linus Walleij <linus.walleij@linaro.org>,
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Subject: Undesirable code, was Re: Old platforms etc.
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On Thu, 14 Jan 2021, Arnd Bergmann wrote:

> I think it's mainly a misunderstanding of what I am trying to do
> in finding the platforms that have been completely abandoned.

Have you tried to identify those drivers and Kconfig symbols in mainline 
that are used only by devices that don't function with mainline kernels?