15 static bool cgroup_update_frozen_flag(struct cgroup *cgrp, bool frozen)  in cgroup_update_frozen_flag()  argument
20 	if (test_bit(CGRP_FROZEN, &cgrp->flags) == frozen)  in cgroup_update_frozen_flag()
23 	if (frozen)  in cgroup_update_frozen_flag()
29 	TRACE_CGROUP_PATH(notify_frozen, cgrp, frozen);  in cgroup_update_frozen_flag()
34  * Propagate the cgroup frozen state upwards by the cgroup tree.
36 static void cgroup_propagate_frozen(struct cgroup *cgrp, bool frozen)  in cgroup_propagate_frozen()  argument
41 	 * If the new state is frozen, some freezing ancestor cgroups may change  in cgroup_propagate_frozen()
42 	 * their state too, depending on if all their descendants are frozen.  in cgroup_propagate_frozen()
44 	 * Otherwise, all ancestor cgroups are forced into the non-frozen state.  in cgroup_propagate_frozen()
47 		if (frozen) {  in cgroup_propagate_frozen()
57 		if (cgroup_update_frozen_flag(cgrp, frozen))  in cgroup_propagate_frozen()
63  * Revisit the cgroup frozen state.
64  * Checks if the cgroup is really frozen and perform all state transitions.
68 	bool frozen;  in cgroup_update_frozen()  local
71 	 * If the cgroup has to be frozen (CGRP_FREEZE bit set),  in cgroup_update_frozen()
72 	 * and all tasks are frozen and/or stopped, let's consider  in cgroup_update_frozen()
73 	 * the cgroup frozen. Otherwise it's not frozen.  in cgroup_update_frozen()
75 	frozen = test_bit(CGRP_FREEZE, &cgrp->flags) &&  in cgroup_update_frozen()
79 	if (cgroup_update_frozen_flag(cgrp, frozen))  in cgroup_update_frozen()
80 		cgroup_propagate_frozen(cgrp, frozen);  in cgroup_update_frozen()
101  * Enter frozen/stopped state, if not yet there. Update cgroup's counters,
108 	if (current->frozen)  in cgroup_enter_frozen()
112 	current->frozen = true;  in cgroup_enter_frozen()
120  * Conditionally leave frozen/stopped state. Update cgroup's counters,
125  * drop the frozen counter to avoid a transient switch to
137 		WARN_ON_ONCE(!current->frozen);  in cgroup_leave_frozen()
138 		current->frozen = false;  in cgroup_leave_frozen()
225 	 * Kernel threads are not supposed to be frozen at all.  in cgroup_freezer_migrate_task()
232 	 * are not freezing and task is not frozen.  in cgroup_freezer_migrate_task()
236 	    !task->frozen)  in cgroup_freezer_migrate_task()
240 	 * Adjust counters of freezing and frozen tasks.  in cgroup_freezer_migrate_task()
241 	 * Note, that if the task is frozen, but the destination cgroup is not  in cgroup_freezer_migrate_task()
242 	 * frozen, we bump both counters to keep them balanced.  in cgroup_freezer_migrate_task()
244 	if (task->frozen) {  in cgroup_freezer_migrate_task()