which_dev          40 kernel/trap.c    int which_dev = 0;
which_dev          69 kernel/trap.c    } else if((which_dev = devintr()) != 0){
which_dev          84 kernel/trap.c    if(which_dev == 2)
which_dev         138 kernel/trap.c    int which_dev = 0;
which_dev         148 kernel/trap.c    if((which_dev = devintr()) == 0){
which_dev         155 kernel/trap.c    if(which_dev == 2 && myproc() != 0)