On Sat, 17 Sep 2016, Bruce Evans wrote:

Author: bde
Date: Sat Sep 17 14:00:52 2016
New Revision: 305899
URL: https://svnweb.freebsd.org/changeset/base/305899

 Remove all kernel uses of pcb_psl, but keep in in the struct to
 preserve the ABI and API for applications.  It was removed in the port
 to amd64, but was remained as garbage giving a micro-pessimization and
 spurious single-step traps on i386.

Actually, I committed a version that breaks the API by renaming the
variable.  I will leave it like that.  pcb_psl is not used anywhere
in head/ports, so it is used in at most the externally-maintained part
of a port or things like gdb scripts.

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