blk_rq_map_kern   464 block/scsi_ioctl.c 	if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
blk_rq_map_kern   752 include/linux/blkdev.h extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);