Separate names with a comma.
Haha, everything was fine with kernel 5.5 and modified tools.
You can refer to this commit: https://github.com/torvalds/linux/commit/39808e451fdf30d20099a92e5185a0acb028d826
I have fixed this issue, you can add KBUILD_EXTRA_SYMBOLS := /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/Module.symvers to...