DEBUG_VAR_NAME
static int DEBUG_VAR_NAME = _default_level; \
SYSCTL_INT(_DEBUG_SYSCTL_OID, OID_AUTO, DEBUG_VAR_NAME, \
&(DEBUG_VAR_NAME), 0, "debuglevel")
#define _DEBUG_PASS_MSG(_l) (DEBUG_VAR_NAME >= (_l))
if ((DEBUG_MAX_LEVEL >= (_l)) && (__predict_false(DEBUG_VAR_NAME >= (_l))))