On powerpc (allyesconfig build) we get this error:

drivers/isdn/hardware/mISDN/hfcpci.c:1991: error: implicit declaration of function 'virt_to_bus'
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Enable support for cards with Cologne Chip AG's HFC multiport
chip.
Signed-off-by: NKarsten Keil <kkeil@suse.de>

Enable support for card with Cologne Chip AG's
HFC PCIbased cards
Signed-off-by: NKarsten Keil <kkeil@suse.de>