Fixed three bugs with aux threads and nested locks

Fixes two bugs with nested locks:
1) List of aux threads could become corrupted.
  -- moved modifications to be within scheduler lock.

2) Fixed bad EDF comparison ordering that could lead
to schedule thrashing in an infinite loop.

3) Prevent aux threads from inheriting a priority from
a task that is blocked on a real-time litmus lock.
(since the aux threads can't possibly hold these locks,
we don't have to worry about inheritance.)

2 files changed, 4 insertions, 0 deletions

diff --git a/include/litmus/locking.h b/include/litmus/locking.h
index 296bbf6f7af0..4a5f198a0407 100644
--- a/include/litmus/locking.h
+++ b/include/litmus/locking.h
@@ -156,5 +156,8 @@ struct litmus_lock_ops {
 #endif
 
 
+void suspend_for_lock(void);
+
+
 #endif
 
diff --git a/include/litmus/rt_param.h b/include/litmus/rt_param.h
index 8b9e14c461dc..44f85a366574 100644
--- a/include/litmus/rt_param.h
+++ b/include/litmus/rt_param.h
@@ -288,6 +288,7 @@ struct rt_param {
 #ifdef CONFIG_REALTIME_AUX_TASKS
         unsigned int            is_aux_task:1;
         unsigned int            has_aux_tasks:1;
+        unsigned int            hide_from_aux_tasks:1;
 
         struct list_head        aux_task_node;
         struct binheap_node     aux_task_owner_node;