Losing the magic
https://lwn.net/SubscriberLink/915163/ba83480903b82cb8/
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The kernel project is now more than three decades old; over that time, a
number of development practices have come and gone. Once upon a time, the
use of "magic numbers" to identify kernel data structures was seen as a
good way to help detect and debug problems. Over the years, though, the
use of magic numbers has gone into decline; this
patch set from Ahelenia Ziemiańska may be an indication that the reign
of magic numbers may be reaching its end.