12  * Propagate the cgroup frozen state upwards by the cgroup tree.
14 static void cgroup_propagate_frozen(struct cgroup *cgrp, bool frozen)  in cgroup_propagate_frozen()  argument
19 	 * If the new state is frozen, some freezing ancestor cgroups may change  in cgroup_propagate_frozen()
20 	 * their state too, depending on if all their descendants are frozen.  in cgroup_propagate_frozen()
22 	 * Otherwise, all ancestor cgroups are forced into the non-frozen state.  in cgroup_propagate_frozen()
25 		if (frozen) {  in cgroup_propagate_frozen()
49  * Revisit the cgroup frozen state.
50  * Checks if the cgroup is really frozen and perform all state transitions.
54 	bool frozen;  in cgroup_update_frozen()  local
59 	 * If the cgroup has to be frozen (CGRP_FREEZE bit set),  in cgroup_update_frozen()
60 	 * and all tasks are frozen and/or stopped, let's consider  in cgroup_update_frozen()
61 	 * the cgroup frozen. Otherwise it's not frozen.  in cgroup_update_frozen()
63 	frozen = test_bit(CGRP_FREEZE, &cgrp->flags) &&  in cgroup_update_frozen()
66 	if (frozen) {  in cgroup_update_frozen()
80 	TRACE_CGROUP_PATH(notify_frozen, cgrp, frozen);  in cgroup_update_frozen()
83 	cgroup_propagate_frozen(cgrp, frozen);  in cgroup_update_frozen()
104  * Enter frozen/stopped state, if not yet there. Update cgroup's counters,
111 	if (current->frozen)  in cgroup_enter_frozen()
115 	current->frozen = true;  in cgroup_enter_frozen()
123  * Conditionally leave frozen/stopped state. Update cgroup's counters,
128  * drop the frozen counter to avoid a transient switch to
140 		WARN_ON_ONCE(!current->frozen);  in cgroup_leave_frozen()
141 		current->frozen = false;  in cgroup_leave_frozen()
228 	 * Kernel threads are not supposed to be frozen at all.  in cgroup_freezer_migrate_task()
235 	 * are not freezing and task is not frozen.  in cgroup_freezer_migrate_task()
239 	    !task->frozen)  in cgroup_freezer_migrate_task()
243 	 * Adjust counters of freezing and frozen tasks.  in cgroup_freezer_migrate_task()
244 	 * Note, that if the task is frozen, but the destination cgroup is not  in cgroup_freezer_migrate_task()
245 	 * frozen, we bump both counters to keep them balanced.  in cgroup_freezer_migrate_task()
247 	if (task->frozen) {  in cgroup_freezer_migrate_task()
288 			 * Already frozen because of ancestor's settings?  in cgroup_freeze()
295 			 * Still frozen because of ancestor's settings?  in cgroup_freeze()