linux-kernel - Re: [PATCH 0/4] Cleanup arm64 driver dependencies

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Date:   Thu, 12 Sep 2019 11:03:08 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Amit Kucheria <amit.kucheria@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        arm-soc <arm@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Sebastian Reichel <sre@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Will Deacon <will@...nel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 0/4] Cleanup arm64 driver dependencies

On Thu, Sep 12, 2019 at 11:29:00AM +0200, Arnd Bergmann wrote:

> Generally speaking, the way that works best is

> config SUBSYS_DRIVER_FOO
>        tristate "SUBSYS support for FOO platform"
>        depends on ARCH_FOO || COMPILE_TEST
>        depends on SUBSYS
>        default "m" if ARCH_FOO

> This means it's enabled as a loadable module by default (use
> default "y" instead where necessary) as long as the platform
> is enabled, but an x86 allmodconfig build also includes it
> because of COMPILE_TEST, while any configuration without
> ARCH_FOO that is not compile-testing cannot enable it.

Indeed, though we shouldn't be adding any default m/y to things
that don't already default on.

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