dout               16 include/linux/ceph/ceph_debug.h #  define dout(fmt, ...)						\
dout               23 include/linux/ceph/ceph_debug.h #  define dout(fmt, ...)	do {				\
dout               34 include/linux/ceph/ceph_debug.h # define dout(fmt, ...)	pr_debug(" " fmt, ##__VA_ARGS__)