[RTEMS Project] #4545: The SMP EDF scheduler can only support more restricted affinity sets of a thread (was: The SMP EDF scheduler has to better check the affinity set of a thread)

[RTEMS trac]

#4545: The SMP EDF scheduler can only support more restricted affinity sets of a
thread
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 Reporter:  Sebastian Huber     |       Owner:  Sebastian Huber
     Type:  defect              |      Status:  assigned
 Priority:  normal              |   Milestone:  6.1
Component:  score               |     Version:  5
 Severity:  normal              |  Resolution:
 Keywords:  SMP, qualification  |  Blocked By:
 Blocking:                      |
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Description changed by Sebastian Huber:

Old description:

> The SMP EDF scheduler supports a one-to-one and one-to-all thread to
> processor affinity. Currently it accepts affinity sets which are a proper
> subset of the online processor containing at least two processors owned
> by the scheduler. In this case it sets 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.

New description:

 The SMP EDF scheduler supports a one-to-one and one-to-all thread to
 processor affinity. Currently it accepts affinity sets which are a proper
 subset of the online processors containing at least two processors owned
 by the scheduler. In this case it sets 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.

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Ticket URL: <http://devel.rtems.org/ticket/4545#comment:1>
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