The code is really not needed.
Roland Dreier/Greg KH removed the release_mem_region() calls that
were the only consumers of phys_addr:
	http://www.ussg.iu.edu/hypermail/linux/kernel/0503.0/1540.html

patch below deletes the "dead" code.
Signed-off-by: NGrant Grundler <iod00d@hp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>