lru_add_drain_work  695 mm/swap.c      static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work);
lru_add_drain_work  726 mm/swap.c      		struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
lru_add_drain_work  741 mm/swap.c      		flush_work(&per_cpu(lru_add_drain_work, cpu));