linux-kernel - Re: [PATCH 2/3] x86: apuv2: fix input dependencies

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Message-ID: <CAK8P3a1-AYWtNEqwb4ZMpXKDwGB_ZGLj==uBakh0+L=5g=BQQw@mail.gmail.com>
Date:   Tue, 5 Mar 2019 17:46:17 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Linus Walleij <linusw@...nel.org>,
        Enrico Weigelt <info@...ux.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 2/3] x86: apuv2: fix input dependencies

On Tue, Mar 5, 2019 at 2:50 PM Enrico Weigelt, metux IT consult
<lkml@...ux.net> wrote:
>
> On 05.03.19 09:23, Arnd Bergmann wrote:
>
> hmm, if circular deps happen, wouldn't that mean we've got some deeper
> problems in here ? IMHO, dependencies should always form a DAG (except
> for some really rare cases).
>
> Do you recall any actual problem w/ input vs gpio vs. drivers ?
> I'd like to have a closer look at it.

Not with gpio. Most of the circular dependencies I've seen tend to
revolve around drivers/gpu/drm, which uses more 'select' statements
than most other subsystems. Those dependencies often touch
backlight, acpi, fbdev and other things then.

       Arnd