[RTEMS Project] #3175: Merge FreeBSD timecounter changes from 2015-01-20 to now

[RTEMS trac]

#3175: Merge FreeBSD timecounter changes from 2015-01-20 to now
-----------------------------+------------------------------
 Reporter:  Sebastian Huber  |       Owner:  Sebastian Huber
     Type:  enhancement      |      Status:  assigned
 Priority:  normal           |   Milestone:  4.12.0
Component:  score            |     Version:  4.12
 Severity:  normal           |  Resolution:
 Keywords:                   |
-----------------------------+------------------------------

Comment (by Eric van Gyzen <vangyzen@…>):

 In [changeset:"5167d0e76bd0e153a5147064c96e2aa5e7282bc2/rtems"
 5167d0e/rtems]:
 {{{
 #!CommitTicketReference repository="rtems"
 revision="5167d0e76bd0e153a5147064c96e2aa5e7282bc2"
 timecounter: Merge FreeBSD change r315287

 Add missing pieces of r315280

 I moved this branch from github to a private server, and pulled from the
 wrong one when committing r315280, so I failed to include two recent
 commits.
 Thankfully, they were only cosmetic and were included in the review.
 Specifically:

 Add documentation, polish comments, and improve style(9).

 Tested by:      pho (r315280)
 MFC after:      2 weeks
 Sponsored by:   Dell EMC
 Differential Revision:  https://reviews.freebsd.org/D9791

 Update #3175.
 }}}

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Ticket URL: <http://devel.rtems.org/ticket/3175#comment:22>
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