Pfair: improve robustness of suspensions

This patch fixes two crash or hang bugs related to suspensions
in Pfair.

1) When a job was not present at the end of its last subtask, then
   its linked_on field was not cleared. This confused the scheduler
   when it later resumed. Fix: clear the field.

2) Just testing for linked_on == NO_CPU is insufficient in the wake_up path
   to determine whether a task should be added to the ready queue. If
   the task remained linked and then was "preempted" at a later
   quantum boundary, then it already is in the ready queue and nothing
   is required. Fix: encode need to requeue in task_rt(t)->flags.

0 files changed, 0 insertions, 0 deletions