[$] The strange story of the ARM Meltdown-fix backport

Alex Shi's posting of a patch seriesbackporting a set of Meltdown fixes for the arm64 architecture to the4.9 kernel might seem like a normal exercise in making important securityfixes available on older kernels. But this case raised a couple ofinteresting questions about why this backport should be accepted into thelong-term-support kernels - and a couple of equally interesting answers,one of which was rather better received than the other.