umassdebug
extern int umassdebug;
int umassdebug = 0;
NULL, 0, &umassdebug, sizeof(umassdebug), CTL_CREATE, CTL_EOL);
if (umassdebug & UDMASS_SCSI)
else if (umassdebug & ~UDMASS_CMD)
#define DIF(m, x) if (umassdebug & (m)) do { x ; } while (0)
extern int umassdebug;
#define DPRINTFM(M,FMT,A,B,C,D) USBHIST_LOGM(umassdebug,M,FMT,A,B,C,D)
#define UMASSHIST_CALLED(name) USBHIST_CALLED(umassdebug)