axedebug
static int axedebug = 0;
NULL, 0, &axedebug, sizeof(axedebug), CTL_CREATE, CTL_EOL);
#define DPRINTF(FMT,A,B,C,D) USBHIST_LOGN(axedebug,1,FMT,A,B,C,D)
#define DPRINTFN(N,FMT,A,B,C,D) USBHIST_LOGN(axedebug,N,FMT,A,B,C,D)
#define AXEHIST_CALLED(name) USBHIST_CALLED(axedebug)