There is an updated pull request by leahneukirchen against master on the void-packages repository

https://github.com/ericonr/void-packages linux5.9
https://github.com/void-linux/void-packages/pull/27145

[WIP] kernel-libc-headers: update to 5.10.
- haven't rebased patches
- requires rsync for install step! BAD

Haven't tried building anything with them yet. Also, this requires a revbump to all the cross toolchains. And the `rsync` part breaks bootstrap, afaik. So gotta turn that into some nice `cp $(find ...)`

https://github.com/torvalds/linux/blob/v5.10/Makefile#L1280

A patch file from https://github.com/void-linux/void-packages/pull/27145.patch is attached