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 4.1 (release Date: 2015-06-21)
This option selects CONFIG_MMU_NOTIFIER if it isn't already
selected to enabled full userptr support.
selected to enabled full userptr support.