64 static struct pids_cgroup *parent_pids(struct pids_cgroup *pids)  in parent_pids()  argument
66 	return css_pids(pids->css.parent);  in parent_pids()
72 	struct pids_cgroup *pids;  in pids_css_alloc()  local
74 	pids = kzalloc(sizeof(struct pids_cgroup), GFP_KERNEL);  in pids_css_alloc()
75 	if (!pids)  in pids_css_alloc()
78 	atomic64_set(&pids->counter, 0);  in pids_css_alloc()
79 	atomic64_set(&pids->limit, PIDS_MAX);  in pids_css_alloc()
80 	atomic64_set(&pids->events_limit, 0);  in pids_css_alloc()
81 	return &pids->css;  in pids_css_alloc()
107 static void pids_cancel(struct pids_cgroup *pids, int num)  in pids_cancel()  argument
113 	WARN_ON_ONCE(atomic64_add_negative(-num, &pids->counter));  in pids_cancel()
121 static void pids_uncharge(struct pids_cgroup *pids, int num)  in pids_uncharge()  argument
125 	for (p = pids; parent_pids(p); p = parent_pids(p))  in pids_uncharge()
138 static void pids_charge(struct pids_cgroup *pids, int num)  in pids_charge()  argument
142 	for (p = pids; parent_pids(p); p = parent_pids(p)) {  in pids_charge()
158 static int pids_try_charge(struct pids_cgroup *pids, int num)  in pids_try_charge()  argument
162 	for (p = pids; parent_pids(p); p = parent_pids(p)) {  in pids_try_charge()
184 	for (q = pids; q != p; q = parent_pids(q))  in pids_try_charge()
197 		struct pids_cgroup *pids = css_pids(dst_css);  in pids_can_attach()  local
209 		pids_charge(pids, 1);  in pids_can_attach()
222 		struct pids_cgroup *pids = css_pids(dst_css);  in pids_cancel_attach()  local
230 		pids_uncharge(pids, 1);  in pids_cancel_attach()
241 	struct pids_cgroup *pids;  in pids_can_fork()  local
248 	pids = css_pids(css);  in pids_can_fork()
249 	err = pids_try_charge(pids, 1);  in pids_can_fork()
252 		if (atomic64_inc_return(&pids->events_limit) == 1) {  in pids_can_fork()
257 		cgroup_file_notify(&pids->events_file);  in pids_can_fork()
265 	struct pids_cgroup *pids;  in pids_cancel_fork()  local
271 	pids = css_pids(css);  in pids_cancel_fork()
272 	pids_uncharge(pids, 1);  in pids_cancel_fork()
277 	struct pids_cgroup *pids = css_pids(task_css(task, pids_cgrp_id));  in pids_release()  local
279 	pids_uncharge(pids, 1);  in pids_release()
286 	struct pids_cgroup *pids = css_pids(css);  in pids_max_write()  local
308 	atomic64_set(&pids->limit, limit);  in pids_max_write()
315 	struct pids_cgroup *pids = css_pids(css);  in pids_max_show()  local
316 	int64_t limit = atomic64_read(&pids->limit);  in pids_max_show()
329 	struct pids_cgroup *pids = css_pids(css);  in pids_current_read()  local
331 	return atomic64_read(&pids->counter);  in pids_current_read()
337 	struct pids_cgroup *pids = css_pids(css);  in pids_peak_read()  local
339 	return READ_ONCE(pids->watermark);  in pids_peak_read()
344 	struct pids_cgroup *pids = css_pids(seq_css(sf));  in pids_events_show()  local
346 	seq_printf(sf, "max %lld\n", (s64)atomic64_read(&pids->events_limit));  in pids_events_show()