Re: [PATCH v5 12/21] libnvdimm: namespace indices: read and validate

+#include <asm-generic/io-64-nonatomic-lo-hi.h>
+
+#ifndef __io_virt
+#define __io_virt(x) ((void __force *) (x))
+#endif

NAK. driver code mus never include asm-generic headers directly,
and __io_virt isn't something that's up to a driver to redefine either.

I think we really need the memremap series in first before trying to
do the things done in this patch.