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    SubjectRe: simplify gendisk lookup and remove struct block_device aliases v4
    Jens, can you take a look and possibly pick this series up?

    On Thu, Oct 29, 2020 at 03:58:23PM +0100, Christoph Hellwig wrote:
    > 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
    ---end quoted text---

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