[$] Losing the magic

The kernel project is now more than three decades old; over that time, anumber of development practices have come and gone. Once upon a time, theuse of "magic numbers" to identify kernel data structures was seen as agood way to help detect and debug problems. Over the years, though, theuse of magic numbers has gone into decline; thispatch set from Ahelenia Ziemiaska may be an indication that the reignof magic numbers may be reaching its end.