sched: ipipe: add domain debug checks to common scheduling paths

Catch invalid calls of root-only code from the head domain from common
paths which may lead to blocking the current task linux-wise. Checks
are enabled by CONFIG_IPIPE_DEBUG_CONTEXT.

include/linux/kernel.h

@@ -239,9 +239,12 @@ struct user;
 
 #ifdef CONFIG_PREEMPT_VOLUNTARY
 extern int _cond_resched(void);
-# define might_resched() _cond_resched()
+# define might_resched() do { \
+		ipipe_root_only(); \
+		_cond_resched(); \
+	} while (0)
 #else
-# define might_resched() do { } while (0)
+# define might_resched() ipipe_root_only()
 #endif
 
 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP

kernel/sched/wait.c

@@ -79,6 +79,8 @@ static int __wake_up_common(struct wait_queue_head *wq_head, unsigned int mode,
 	} else
 		curr = list_first_entry(&wq_head->head, wait_queue_entry_t, entry);
 
+	ipipe_root_only();
+
 	if (&curr->entry == &wq_head->head)
 		return nr_exclusive;