dout               18 include/linux/ceph/ceph_debug.h #  define dout(fmt, ...)						\
dout               24 include/linux/ceph/ceph_debug.h #  define dout(fmt, ...)	do {				\
dout               35 include/linux/ceph/ceph_debug.h # define dout(fmt, ...)	pr_debug(" " fmt, ##__VA_ARGS__)