bg.salunke09@... asked:

Can I get information about oldest linux kernel version that can support BTF?

The basic support appears to have been added by

commit e83b9f55448afce3fe1abcd1d10db9584f8042a6
Author: Andrii Nakryiko <andriin@...>
Date: Tue Apr 2 09:49:50 2019 -0700
kbuild: add ability to generate BTF type info for vmlinux

The inquiry "git branch --contains e83b9f55448a" will tell you which
of your branches contains this commit.

Hope this helps,
Alison Chaiken
Aurora Innovation