opt_xferlen_exp 4452 drivers/scsi/scsi_debug.c module_param_named(opt_xferlen_exp, sdebug_opt_xferlen_exp, int, S_IRUGO); opt_xferlen_exp 4512 drivers/scsi/scsi_debug.c MODULE_PARM_DESC(opt_xferlen_exp, "optimal transfer length granularity exponent (def=physblk_exp)");