debug4            656 kern/kern_sysctl.c struct ctldebug debug2, debug3, debug4;
debug4            661 kern/kern_sysctl.c 	&debug0, &debug1, &debug2, &debug3, &debug4,
debug4            656 sys/sysctl.h   extern struct ctldebug debug0, debug1, debug2, debug3, debug4;