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 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html