HZ_TO_MSEC_SHR32 384 kernel/time/time.c return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >> HZ_TO_MSEC_SHR32 385 kernel/time/time.c HZ_TO_MSEC_SHR32;