blk_stat_alloc_callback 2873 block/blk-mq.c 	q->poll_cb = blk_stat_alloc_callback(blk_mq_poll_stats_fn,
blk_stat_alloc_callback   85 block/blk-stat.h blk_stat_alloc_callback(void (*timer_fn)(struct blk_stat_callback *),
blk_stat_alloc_callback  829 block/blk-wbt.c 	rwb->cb = blk_stat_alloc_callback(wb_timer_fn, wbt_data_dir, 2, rwb);