[$] Revisiting "too small to fail"

Back in 2014, the revelation that thekernel'smemory-management subsystem would not allow relatively small allocationrequests to fail created a bit of a stir. The discussion has settled downsince then, but the "too small to fail" rule still clearly creates acertain amount of confusion in the kernel community, as is evidenced by arecent discussion inspired by the 4.12 merge window. It would appear thatthe rule remains in effect, but developers are asked to act as if it did not.