Symbol: NANOTIME_SUB
sys/dev/disk/isp/isp.c
2499
enano = NANOTIME_SUB(&hrb, &hra);
sys/dev/disk/isp/isp_freebsd.c
2162
if (NANOTIME_SUB(&isp->isp_init_time, &now) > 2000000000ULL) {