Problems with phys_to_pfn_t in linux-next and s390

[Guenter Roeck]

s390:defconfig:

ERROR: "phys_to_pfn_t" [drivers/s390/block/dcssblk.ko] undefined!

s390 does not set CONFIG_HAS_IOMEM, which is required for phys_to_pfn_t to exist.

Introduced with commit e014f77c4b ("mm-dax-pmem-introduce-pfn_t-v3") and
possibly earlier.

Guenter
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