linux-kernel - Re: [PATCH 1/2] drm: fix drm

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Date:   Wed, 11 Jan 2017 17:59:57 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] drm: fix drm_vm for NOMMU builds

On Wed, Jan 11, 2017 at 5:36 PM, Daniel Vetter <daniel@...ll.ch> wrote:
> On Wed, Jan 11, 2017 at 5:33 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> CONFIG_DRM_VM=y
>
> Does randconfig just set this for fun, despite that it's a hidden
> Kconfig symbol? Should we add a depends !NOMMU to it to make sure it
> never gets enabled when it shouldn't be?
>
> tbh I have no idea how Kconfig works, I'm just really good at breaking it :(

no, randconfig won't try to set symbols that a user doesn't see. This
is what 'menuconfig'
says enabled it.

  │   Selected by: DRM_NOUVEAU [=n] && HAS_IOMEM [=y] && DRM [=y] &&
PCI [=n] && MMU [=n] && (BACKLIGHT_CLASS_DEVICE [=m] || !ACPI) ||
DRM_LEGACY [=y] && HAS_IOMEM [=y] && DRM [=y]

It must be the 'DRM_LEGACY' option that is actually user visible and
that contains
'select DRM_VM'.

     Arnd