Hello,
This is a tracker of ABI changes in the new upstream releases of the Linux kernel (defconfig, x86_64): https://abi-laboratory.pro/tracker/timeline/linux/
The tracker performs backward binary compatibility analysis of all public exported symbols and data types (declared in the ".ksymtab" and ".ksymtab_gpl" sections of the vmlinux binary + system calls) and lists all added/removed symbols.
The source code of the tool is published on github: https://github.com/lvc/kernel-abi-tracker
The tool can be used to analyze downstream kernels as well. See README of the project.
Enjoy!