Comment 15 for bug 1906131

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1906131

This is NOT_A_BUG , just a new feature starting from the kernels 5.10.0 onwards.

The patch which made this mess is the following:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/Makefile?id=746b25b1aa0f5736d585728ded70a8141da91edb

Please, read the following net pointer how to handle the patch:
https://www.kernel.org/doc/Documentation/kbuild/modules.txt

For the practical implementation, please, read the following net pointer (answer 2):
https://stackoverflow.com/questions/65972180/im-unable-to-build-the-simple-hello-world-kernel-module-from-kernel-5-10-11/65979628#65979628

Zee