nvidia-dkms-390 fails to build on unstable / 5.10

[Andrea Righi]

[Impact]

nvidia-graphics-drivers-390 fails to build against linux 5.10:

ERROR (dkms apport): kernel package linux-headers-5.10.0-6-generic is not supported
Error! Bad return status for module build on kernel: 5.10.0-6-generic (x86_64)
Consult /var/lib/dkms/nvidia/390.138/build/make.log for more information.
dpkg: error processing package nvidia-dkms-390 (--configure):
 installed nvidia-dkms-390 package post-installation script subprocess returned error exit status 10
Processing triggers for initramfs-tools (0.137ubuntu12) ...
update-initramfs: Generating /boot/initrd.img-5.10.0-6-generic
Errors were encountered while processing:
 nvidia-dkms-390
E: Sub-process /usr/bin/dpkg returned an error code (1)

[Test case]

sudo apt install nvidia-dkms-390

[Fix]

Fix build errors adding the proper #ifdef to support the new 5.10 includes, function prototypes and data structs.

[Regression potential]

All the new code is conditional (#ifdef) and it's applied only with 5.10, so there is no risk to break the other kernels (5.8). Moreover, it's worth considering that hirsute should move soon to 5.10.

[Andrea Righi (arighi)]

make.log in attach.

[Andrea Righi (arighi)]

debdiff that fixes the 5.10 build errors reported in attach.

[Andrea Righi (arighi)]

New debdiff that prevents building UVM w/ Linux 5.10 (thanks @albertomilone) and with a refreshed version of buildfix_kernel_5.10.patch that should prevent a potential memory leak due to the missing .gem_free_object in 5.10.

[Andrea Righi (arighi)]

Sorry, I posted the wrong file in comment #3, this is the right one.