Re: [PATCH 1/2] drm: fix drm_vm for NOMMU builds

[Arnd Bergmann]

On Wed, Jan 11, 2017 at 5:36 PM, Daniel Vetter <daniel@xxxxxxxx> wrote:
> On Wed, Jan 11, 2017 at 5:33 PM, Arnd Bergmann <arnd@xxxxxxxx> 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.

  â   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