MMUCR_URB_NENTRIES
urb = MMUCR_URB_NENTRIES + 1;
status = MMUCR_URB_NENTRIES;
status = MMUCR_URB_NENTRIES;
urb = urb % MMUCR_URB_NENTRIES;
BUG_ON(urb++ == MMUCR_URB_NENTRIES);
urb = urb % MMUCR_URB_NENTRIES;