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arch/s390/net/pnet.c uses ccwgroup function dev_is_ccwgroup() in pnetid_by_dev_port(). For s390 the net/smc code makes use of function pnetid_by_dev_port(). Make sure ccwgroup is built into the kernel, if smc is to be built into the kernel. Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>