@@ -70,6 +70,7 @@ struct misc_cg {
struct misc_res res[MISC_CG_RES_TYPES];
};
+struct misc_cg *misc_cg_root(void);
u64 misc_cg_res_total_usage(enum misc_res_type type);
int misc_cg_set_capacity(enum misc_res_type type, u64 capacity);
int misc_cg_set_ops(enum misc_res_type type, const struct misc_res_ops *ops);
@@ -90,6 +91,20 @@ static inline struct misc_cg *css_misc(struct cgroup_subsys_state *css)
return css ? container_of(css, struct misc_cg, css) : NULL;
}
+/**
+ * misc_cg_parent() - Get the parent of the passed misc cgroup.
+ * @cgroup: cgroup whose parent needs to be fetched.
+ *
+ * Context: Any context.
+ * Return:
+ * * struct misc_cg* - Parent of the @cgroup.
+ * * %NULL - If @cgroup is null or the passed cgroup does not have a parent.
+ */
+static inline struct misc_cg *misc_cg_parent(struct misc_cg *cgroup)
+{
+ return cgroup ? css_misc(cgroup->css.parent) : NULL;
+}
+
/*
* get_current_misc_cg() - Find and get the misc cgroup of the current task.
*
@@ -114,6 +129,15 @@ static inline void put_misc_cg(struct misc_cg *cg)
}
#else /* !CONFIG_CGROUP_MISC */
+static inline struct misc_cg *misc_cg_root(void)
+{
+ return NULL;
+}
+
+static inline struct misc_cg *misc_cg_parent(struct misc_cg *cg)
+{
+ return NULL;
+}
static inline u64 misc_cg_res_total_usage(enum misc_res_type type)
{
@@ -43,17 +43,11 @@ static u64 misc_res_capacity[MISC_CG_RES_TYPES];
static const struct misc_res_ops *misc_res_ops[MISC_CG_RES_TYPES];
/**
- * parent_misc() - Get the parent of the passed misc cgroup.
- * @cgroup: cgroup whose parent needs to be fetched.
- *
- * Context: Any context.
- * Return:
- * * struct misc_cg* - Parent of the @cgroup.
- * * %NULL - If @cgroup is null or the passed cgroup does not have a parent.
+ * misc_cg_root() - Return the root misc cgroup.
*/
-static struct misc_cg *parent_misc(struct misc_cg *cgroup)
+struct misc_cg *misc_cg_root(void)
{
- return cgroup ? css_misc(cgroup->css.parent) : NULL;
+ return &root_cg;
}
/**
@@ -176,7 +170,7 @@ static void misc_cg_event(enum misc_res_type type, struct misc_cg *cg)
atomic64_inc(&cg->res[type].events_local);
cgroup_file_notify(&cg->events_local_file);
- for (; parent_misc(cg); cg = parent_misc(cg)) {
+ for (; misc_cg_parent(cg); cg = misc_cg_parent(cg)) {
atomic64_inc(&cg->res[type].events);
cgroup_file_notify(&cg->events_file);
}
@@ -211,7 +205,7 @@ int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
if (!amount)
return 0;
- for (i = cg; i; i = parent_misc(i)) {
+ for (i = cg; i; i = misc_cg_parent(i)) {
res = &i->res[type];
new_usage = atomic64_add_return(amount, &res->usage);
@@ -227,7 +221,7 @@ int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
err_charge:
misc_cg_event(type, i);
- for (j = cg; j != i; j = parent_misc(j))
+ for (j = cg; j != i; j = misc_cg_parent(j))
misc_cg_cancel_charge(type, j, amount);
misc_cg_cancel_charge(type, i, amount);
return ret;
@@ -249,7 +243,7 @@ void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
if (!(amount && valid_type(type) && cg))
return;
- for (i = cg; i; i = parent_misc(i))
+ for (i = cg; i; i = misc_cg_parent(i))
misc_cg_cancel_charge(type, i, amount);
}
EXPORT_SYMBOL_GPL(misc_cg_uncharge);