memremap: provide an optional internal refcount in struct dev_pagemap
Provide an internal refcounting logic if no ->ref field is provided in the pagemap passed into devm_memremap_pages so that callers don't have to reinvent it poorly. Signed-off-by:Christoph Hellwig <hch@lst.de> Reviewed-by:
Ira Weiny <ira.weiny@intel.com> Reviewed-by:
Dan Williams <dan.j.williams@intel.com> Tested-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
Jason Gunthorpe <jgg@mellanox.com>
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