65 static struct pids_cgroup *parent_pids(struct pids_cgroup *pids)  in parent_pids()  argument
67 	return css_pids(pids->css.parent);  in parent_pids()
73 	struct pids_cgroup *pids;  in pids_css_alloc()  local
75 	pids = kzalloc(sizeof(struct pids_cgroup), GFP_KERNEL);  in pids_css_alloc()
76 	if (!pids)  in pids_css_alloc()
79 	pids->limit = PIDS_MAX;  in pids_css_alloc()
80 	atomic64_set(&pids->counter, 0);  in pids_css_alloc()
81 	atomic64_set(&pids->events_limit, 0);  in pids_css_alloc()
82 	return &pids->css;  in pids_css_alloc()
98 static void pids_cancel(struct pids_cgroup *pids, int num)  in pids_cancel()  argument
104 	WARN_ON_ONCE(atomic64_add_negative(-num, &pids->counter));  in pids_cancel()
112 static void pids_uncharge(struct pids_cgroup *pids, int num)  in pids_uncharge()  argument
116 	for (p = pids; parent_pids(p); p = parent_pids(p))  in pids_uncharge()
129 static void pids_charge(struct pids_cgroup *pids, int num)  in pids_charge()  argument
133 	for (p = pids; parent_pids(p); p = parent_pids(p))  in pids_charge()
146 static int pids_try_charge(struct pids_cgroup *pids, int num)  in pids_try_charge()  argument
150 	for (p = pids; parent_pids(p); p = parent_pids(p)) {  in pids_try_charge()
165 	for (q = pids; q != p; q = parent_pids(q))  in pids_try_charge()
178 		struct pids_cgroup *pids = css_pids(dst_css);  in pids_can_attach()  local
190 		pids_charge(pids, 1);  in pids_can_attach()
203 		struct pids_cgroup *pids = css_pids(dst_css);  in pids_cancel_attach()  local
211 		pids_uncharge(pids, 1);  in pids_cancel_attach()
222 	struct pids_cgroup *pids;  in pids_can_fork()  local
226 	pids = css_pids(css);  in pids_can_fork()
227 	err = pids_try_charge(pids, 1);  in pids_can_fork()
230 		if (atomic64_inc_return(&pids->events_limit) == 1) {  in pids_can_fork()
235 		cgroup_file_notify(&pids->events_file);  in pids_can_fork()
243 	struct pids_cgroup *pids;  in pids_cancel_fork()  local
246 	pids = css_pids(css);  in pids_cancel_fork()
247 	pids_uncharge(pids, 1);  in pids_cancel_fork()
252 	struct pids_cgroup *pids = css_pids(task_css(task, pids_cgrp_id));  in pids_free()  local
254 	pids_uncharge(pids, 1);  in pids_free()
261 	struct pids_cgroup *pids = css_pids(css);  in pids_max_write()  local
283 	pids->limit = limit;  in pids_max_write()
290 	struct pids_cgroup *pids = css_pids(css);  in pids_max_show()  local
291 	int64_t limit = pids->limit;  in pids_max_show()
304 	struct pids_cgroup *pids = css_pids(css);  in pids_current_read()  local
306 	return atomic64_read(&pids->counter);  in pids_current_read()
311 	struct pids_cgroup *pids = css_pids(seq_css(sf));  in pids_events_show()  local
313 	seq_printf(sf, "max %lld\n", (s64)atomic64_read(&pids->events_limit));  in pids_events_show()