Insert extra checks and debug info into the DRM range managers

configname: CONFIG_DRM_DEBUG_MM

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>Insert extra checks and debug info into the DRM range managers
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Enable allocation tracking of memory manager and leak detection on
shutdown.

Recommended for driver developers only.

If in doubt, say "N".