kernel/cgroup/misc.c

57  * valid_type() - Check if @type is valid or not.
58  * @type: misc res type.
62  * * true - If valid type.
63  * * false - If not valid type.
65 static inline bool valid_type(enum misc_res_type type)
67 	return type >= 0 && type < MISC_CG_RES_TYPES;
72  * @type: misc res type.
77 u64 misc_cg_res_total_usage(enum misc_res_type type)
79 	if (valid_type(type))
80 		return atomic64_read(&root_cg.res[type].usage);
88  * @type: Type of the misc res.
91  * If capacity is 0 then the charging a misc cgroup fails for that type.
96  * * %-EINVAL - If @type is invalid.
98 int misc_cg_set_capacity(enum misc_res_type type, u64 capacity)
100 	if (!valid_type(type))
103 	WRITE_ONCE(misc_res_capacity[type], capacity);
110  * @type: Misc res type in misc cg to cancel the charge from.
116 static void misc_cg_cancel_charge(enum misc_res_type type, struct misc_cg *cg,
119 	WARN_ONCE(atomic64_add_negative(-amount, &cg->res[type].usage),
121 		  misc_res_name[type]);
126  * @type: Misc res type to charge.
136  * * -EINVAL - If @type is invalid or misc res has 0 capacity.
140 int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
147 	if (!(valid_type(type) && cg && READ_ONCE(misc_res_capacity[type])))
154 		res = &i->res[type];
158 		    new_usage > READ_ONCE(misc_res_capacity[type])) {
167 		atomic64_inc(&j->res[type].events);
172 		misc_cg_cancel_charge(type, j, amount);
173 	misc_cg_cancel_charge(type, i, amount);
180  * @type: Misc res type which was charged.
186 void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
190 	if (!(amount && valid_type(type) && cg))
194 		misc_cg_cancel_charge(type, i, amount);
250 	enum misc_res_type type = MISC_CG_RES_TYPES;
261 			type = i;
266 	if (type == MISC_CG_RES_TYPES)
279 	if (READ_ONCE(misc_res_capacity[type]))
280 		WRITE_ONCE(cg->res[type].max, max);