There is now a patch for NVIDIA 465.27 with Kernel 5.13-rc.. at: https://gist.github.com/joanbm/4a9d392e6f2d45c93ef434bda78174e5 – click on ‘Raw’ to download the source..
Thanks (again) to Joan Bruguera for the patch, and Willy Frissen for the notification..
I have tested this with Kernel 5.13-rc1, and the driver now compiles OK, and loads/runs..
Robert Gadsdon. May 10th 2021.