On Tue, Nov 9, 2021 at 12:33 AM Christoph Hellwig <hch@xxxxxx> wrote: > > Drivers that register a dax_dev should make sure it works, no need > to double check from the file system. Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx> ...with a self-reminder to migrate this validation to a unit test to backstop any future refactoring of the memmap reservation code.