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Add stronger warning that spl is historical. I almost deleted this

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man page entirely, but it is still mildly useful in understanding the
few splxxx usages we still have in the tree.
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imp 2008-09-28 03:45:16 +00:00
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@ -74,6 +74,15 @@ Use mutexes to protect data structures instead.
See
.Xr mutex 9
for more information.
The API is now a complete NOP.
This man page documents historical behavior so you can understand the
code locking that the spl did when converting code from versions of the
kernel prior to
.Fx 5.0 .
The examples in this man page are also obsolete and should not be viewed
as documenting
.Fx 5.0
and newer.
.Ef
.Pp
The
@ -211,6 +220,9 @@ sets of functions to be blocked during some periods of the life of
the system.
The historical number scheme can be considered as a
simple linearly ordered set of interrupt priority groups.
.Pp
.Fx 5.0 eliminated spl entirely in favor of locking primitives which scale
to more than one processor.
.Sh AUTHORS
This manual page was written by
.An J\(:org Wunsch .