Hook into kernel/exit.c to force exiting RT tasks into best-effort mode

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index a27a04c4fa35..07e491702a70 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -61,6 +61,8 @@
 
 static void exit_mm(struct task_struct *tsk);
 
+#include <litmus/litmus.h>
+
 extern void exit_od_table(struct task_struct *t);
 
 static void __unhash_process(struct task_struct *p, bool group_dead)
@@ -667,6 +669,15 @@ void do_exit(long code)
         if (unlikely(!tsk->pid))
                 panic("Attempted to kill the idle task!");
 
+        if (unlikely(is_realtime(tsk))) {
+                /* We would like the task to be polite
+                 * and transition out of RT mode first.
+                 * Let's give it a little help.
+                 */
+                litmus_do_exit(tsk);
+                BUG_ON(is_realtime(tsk));
+        }
+
         /*
          * If do_exit is called because this processes oopsed, it's possible
          * that get_fs() was left as KERNEL_DS, so reset it to USER_DS before