Reapply "[LTS 8.8-RT] Ooops all breaks"

This reverts commit 3989c50.

Author: PlaidCat

include/linux/sched.h

@@ -698,7 +698,7 @@ struct task_struct_rh {
 #endif
 
 	/* pointer back to the main task_struct */
-	struct task_struct		*task_struct;
+	struct task_struct		*task_struct //oops all breaks
 	int				trc_reader_nesting;
 	int				trc_ipi_to_cpu;
 	union rcu_special		trc_reader_special;