Hi all, this series removes the annoying struct block_device aliases, which can happen for a bunch of old floppy drivers (and z2ram). In that case multiple struct block device instances for different dev_t's can point to the same gendisk, without being partitions. The cause for that is the probe/get callback registered through blk_register_regions. This series removes blk_register_region entirely, splitting it it into a simple xarray lookup of registered gendisks, and a probe callback stored in the major_names array that can be used for modprobe overrides or creating devices on demands when no gendisk is found. The old remapping is gone entirely, and instead the 4 remaining drivers just register a gendisk for each operating mode. In case of the two drivers that have lots of aliases that is done on-demand using the new probe callback, while for the other two I simply register all at probe time to keep things simple. Note that the m68k drivers are compile tested only. Changes since v3: - keep kobj_map for char dev lookup for now, as the testbot found some very strange and unexplained regressions, so I'll get back to this later separately - fix a commit message typo Changes since v2: - fix a wrong variable passed to ERR_PTR in the floppy driver - slightly adjust the del_gendisk cleanups to prepare for the next series touching this area Changes since v1: - add back a missing kobject_put in the cdev code - improve the xarray delete loops
