xhcidebug
NULL, 0, &xhcidebug, sizeof(xhcidebug), CTL_CREATE, CTL_EOL);
#define DPRINTF(FMT,A,B,C,D) USBHIST_LOG(xhcidebug,FMT,A,B,C,D)
#define DPRINTFN(N,FMT,A,B,C,D) USBHIST_LOGN(xhcidebug,N,FMT,A,B,C,D)
#define XHCIHIST_CALLED(name) USBHIST_CALLED(xhcidebug)
USBHIST_CALLARGS(xhcidebug,FMT,A,B,C,D)
if (xhcidebug > 0) \
static int xhcidebug = 0;