taglinefilesource code
max_nr520drivers/block/genhd.cint end_minor  = dev->max_nr * dev->max_p;
max_nr548drivers/block/ide.cgd->max_nr  = units;    /* max num real drives */
max_nr1287drivers/scsi/sd.csd_gendisk.max_nr = sd_template.dev_max;
max_nr56include/linux/genhd.hint max_nr;      /* maximum number of real devices */