[RTEMS Project] #4545: The SMP EDF scheduler can only support more restricted affinity sets of a thread

[RTEMS trac]

#4545: The SMP EDF scheduler can only support more restricted affinity sets of a
thread
--------------------------------+------------------------------
 Reporter:  Sebastian Huber     |       Owner:  Sebastian Huber
     Type:  defect              |      Status:  closed
 Priority:  normal              |   Milestone:  6.1
Component:  score               |     Version:  5
 Severity:  normal              |  Resolution:  fixed
 Keywords:  SMP, qualification  |  Blocked By:
 Blocking:                      |
--------------------------------+------------------------------
Changes (by Sebastian Huber <sebastian.huber@…>):

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 In [changeset:"834a86fe212719735fd7ede8c60f78fedf70a758/rtems"
 834a86fe/rtems]:
 {{{
 #!CommitTicketReference repository="rtems"
 revision="834a86fe212719735fd7ede8c60f78fedf70a758"
 score: Restrict affinity for EDF SMP scheduler

 The SMP EDF scheduler supports a one-to-one and one-to-all thread to
 processor affinity. It accepted affinity sets which are a proper
 subset of the online processor containing at least two processors owned by
 the scheduler. In this case it used a one-to-one thread to processor
 affinity. This leads to undefined behaviour if a processor is removed
 since the higher level check in rtems_scheduler_remove_processor() does
 not account for this implementation detail.

 Restrict the affinity set accepted by the SMP EDF scheduler to

 1. all online processors, or

 2. exactly one processor owned by the scheduler.

 Close #4545.
 }}}

--
Ticket URL: <http://devel.rtems.org/ticket/4545#comment:2>
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