static DEFINE_SPINLOCK(swap_token_lock);
struct mm_struct *swap_token_mm;
-struct mem_cgroup *swap_token_memcg;
+static struct mem_cgroup *swap_token_memcg;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
static struct mem_cgroup *swap_token_memcg_from_mm(struct mm_struct *mm)