62 static struct pids_cgroup *parent_pids(struct pids_cgroup *pids)  in parent_pids()  argument
64 	return css_pids(pids->css.parent);  in parent_pids()
70 	struct pids_cgroup *pids;  in pids_css_alloc()  local
72 	pids = kzalloc(sizeof(struct pids_cgroup), GFP_KERNEL);  in pids_css_alloc()
73 	if (!pids)  in pids_css_alloc()
76 	pids->limit = PIDS_MAX;  in pids_css_alloc()
77 	atomic64_set(&pids->counter, 0);  in pids_css_alloc()
78 	atomic64_set(&pids->events_limit, 0);  in pids_css_alloc()
79 	return &pids->css;  in pids_css_alloc()
95 static void pids_cancel(struct pids_cgroup *pids, int num)  in pids_cancel()  argument
101 	WARN_ON_ONCE(atomic64_add_negative(-num, &pids->counter));  in pids_cancel()
109 static void pids_uncharge(struct pids_cgroup *pids, int num)  in pids_uncharge()  argument
113 	for (p = pids; parent_pids(p); p = parent_pids(p))  in pids_uncharge()
126 static void pids_charge(struct pids_cgroup *pids, int num)  in pids_charge()  argument
130 	for (p = pids; parent_pids(p); p = parent_pids(p))  in pids_charge()
143 static int pids_try_charge(struct pids_cgroup *pids, int num)  in pids_try_charge()  argument
147 	for (p = pids; parent_pids(p); p = parent_pids(p)) {  in pids_try_charge()
162 	for (q = pids; q != p; q = parent_pids(q))  in pids_try_charge()
175 		struct pids_cgroup *pids = css_pids(dst_css);  in pids_can_attach()  local
187 		pids_charge(pids, 1);  in pids_can_attach()
200 		struct pids_cgroup *pids = css_pids(dst_css);  in pids_cancel_attach()  local
208 		pids_uncharge(pids, 1);  in pids_cancel_attach()
219 	struct pids_cgroup *pids;  in pids_can_fork()  local
223 	pids = css_pids(css);  in pids_can_fork()
224 	err = pids_try_charge(pids, 1);  in pids_can_fork()
227 		if (atomic64_inc_return(&pids->events_limit) == 1) {  in pids_can_fork()
232 		cgroup_file_notify(&pids->events_file);  in pids_can_fork()
240 	struct pids_cgroup *pids;  in pids_cancel_fork()  local
243 	pids = css_pids(css);  in pids_cancel_fork()
244 	pids_uncharge(pids, 1);  in pids_cancel_fork()
249 	struct pids_cgroup *pids = css_pids(task_css(task, pids_cgrp_id));  in pids_release()  local
251 	pids_uncharge(pids, 1);  in pids_release()
258 	struct pids_cgroup *pids = css_pids(css);  in pids_max_write()  local
280 	pids->limit = limit;  in pids_max_write()
287 	struct pids_cgroup *pids = css_pids(css);  in pids_max_show()  local
288 	int64_t limit = pids->limit;  in pids_max_show()
301 	struct pids_cgroup *pids = css_pids(css);  in pids_current_read()  local
303 	return atomic64_read(&pids->counter);  in pids_current_read()
308 	struct pids_cgroup *pids = css_pids(seq_css(sf));  in pids_events_show()  local
310 	seq_printf(sf, "max %lld\n", (s64)atomic64_read(&pids->events_limit));  in pids_events_show()