[$] Monitoring the internal kernel ABI

As part of the DistributionKernels microconference at Linux Plumbers Conference 2019, MatthiasMinnich described how the Android project monitors changes to the internalkernel ABI. As Android kernels evolve, typically by adding features andbug fixes from more recent kernel versions, the project wants to ensurethat the ABI remains the same so that out-of-tree modules will stillfunction. While the talk was somewhat Android-specific, the techniques andtools used could be applied to other distributions with similar needs(e.g. enterprise distributions).