struct kmem_cache *root_cache)
{
static char memcg_name_buf[NAME_MAX + 1]; /* protected by slab_mutex */
- struct cgroup_subsys_state *css = mem_cgroup_css(memcg);
+ struct cgroup_subsys_state *css = &memcg->css;
struct memcg_cache_array *arr;
struct kmem_cache *s = NULL;
char *cache_name;
bool need_rcu_barrier = false;
bool busy = false;
+ if (unlikely(!s))
+ return;
+
BUG_ON(!is_root_cache(s));
get_online_cpus();