I built a kernel with Low Latency Scheduling and Preemptible Kernel Support. When I ran update_modules, all the modules return with numerous UnResolved Symbol errors. The kernel built OK without errors and does load. If you need, I can forward my .config file.
Numerous problems have been fixed in the r7 version of the kernel and likewise that is the currently recommended kernel and r5 is depreicaited. also this isn't to discriptive... we'd need a copy and paste to work from.