wq_barrier
struct wq_barrier *barr = container_of(work, struct wq_barrier, work);
struct wq_barrier *barr,
static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr,
struct wq_barrier barr;
struct wq_barrier *barr;
barr = container_of(work, struct wq_barrier, work);