The Russian Linux developers at ROSA have come up with a Linux kernel ABI tracker that monitors upstream versions of the kernel to record API and ABI changes.
ROSA is now maintaining a tool to visualize API/ABI changes in the mainline Linux kernel ttree by looking at the number of new/removed symbols and overall changes between releases along with putting out an ABI dump. The ABI dumps can then be compared using the ABI compliance checker.
For those developers interested in this work can find it via the ROSA Lab Wiki
and the Linux Kernel ABI Tracker
ROSA is the Russian company that has their own RHEL server clone
and a Linux desktop distribution