] The code in question is found in
] arch/ia64/sn/io/ate_utils.c in the 2.4 tree. It carries
] an SGI copyright. It seems that SGI was not entirely
] forthcoming in documenting the source of its source; some
] of the code in question was, indisputably, not written at
] SGI. So where does it really come from?
]
] This code is from sys/sys/malloc.c in V7 Unix. It has
] been widely published; among other things, it can be
] found in Lion's Commentary on Unix (if you can get a
] copy). It featured in this 1984 Usenet posting. And,
] crucially, it has been circulated with the V7 Unix
] source, which was released by Caldera (now the SCO Group)
] under the BSD license. SCO would like the world to forget
] about that release now, but the Wayback Machine
] remembers.

LWN: Why SCO won't show the code