rt domain: evil hack to avoid recursive hrtimer lock acquisition

This is a really dirty hack, but works for now since our real-time
tasks do not use hrtimer_wakeup().

The need for this will go away when we port since newer versions of the
Linux kernel allow timers to be activated directly in the scheduler.

1 files changed, 7 insertions, 1 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 2bd9fc2a59..7b8576b6bd 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1314,6 +1314,9 @@ void hrtimer_run_queues(void)
                 run_hrtimer_queue(cpu_base, i);
 }
 
+/* FIXME: this won't be needed anymore once we port to Linux > 2.6.24 */
+void hrtimer_wakeup_hack(int onoff);
+
 /*
  * Sleep related functions:
  */
@@ -1324,8 +1327,11 @@ static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer)
         struct task_struct *task = t->task;
 
         t->task = NULL;
-        if (task)
+        if (task) {
+                hrtimer_wakeup_hack(1);
                 wake_up_process(task);
+                hrtimer_wakeup_hack(0);
+        }
 
         return HRTIMER_NORESTART;
 }