Support Kernel > 5.12

[Tiryoh]

trafficstars

What does this implement/fix?

Does this close any currently open issues?

How has this been tested?

Any other comments?

Checklists

• [ ] I have read the CONTRIBUTING guidelines.
  • If there is no guideline in the repository, rt-net organization's guideline applies.
• [ ] I have checked to ensure there aren't other open Pull Requests for the same change.