Always enable userptr support
configname: CONFIG_DRM_RADEON_USERPTR
Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Always enable userptr support
In linux kernel since version 3.10 (release Date: 2013-06-30)
This option selects CONFIG_MMU_NOTIFIER if it isn't already
selected to enabled full userptr support.
selected to enabled full userptr support.