which_dev          39 kernel/trap.c    int which_dev = 0;
which_dev          68 kernel/trap.c    } else if((which_dev = devintr()) != 0){
which_dev          80 kernel/trap.c    if(which_dev == 2)
which_dev         137 kernel/trap.c    int which_dev = 0;
which_dev         147 kernel/trap.c    if((which_dev = devintr()) == 0){
which_dev         154 kernel/trap.c    if(which_dev == 2 && myproc() != 0)