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From: Guenter Roeck <linux@roeck-us.net>
Subject: Problems with phys_to_pfn_t in linux-next and s390
Message-ID: <567B8929.1060207@roeck-us.net>
Date: Wed, 23 Dec 2015 21:56:57 -0800
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To: Dan Williams <dan.j.williams@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, linux-s390 <linux-s390@vger.kernel.org>, Martin Schwidefsky <schwidefsky@de.ibm.com>
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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