[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:                   |
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Comment (by Ian Lepore <ian@…>):

 In [changeset:"f1463c8bdd6c967501365ca37e662d763864167b/rtems"
 f1463c8/rtems]:
 {{{
 #!CommitTicketReference repository="rtems"
 revision="f1463c8bdd6c967501365ca37e662d763864167b"
 timecounter: Merge FreeBSD change r286701

 If a specific timecounter has been chosen via sysctl, and a new
 timecounter with higher quality registers (presumably in a module that has
 just been loaded), do not undo the user's choice by switching to the new
 timecounter.

 Document that behavior, and also the fact that there is no way to
 unregister
 a timecounter (and thus no way to unload a module containing one).

 Update #3175.
 }}}

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Ticket URL: <http://devel.rtems.org/ticket/3175#comment:8>
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