kdb_bt1
kdb_bt1(kdb_tsk, "A", false);
if (kdb_bt1(p, mask, btaprompt))
if (kdb_bt1(p, mask, btaprompt))
return kdb_bt1(p, "A", false);
return kdb_bt1((struct task_struct *)addr, "A", false);
return kdb_bt1(kdb_current_task, "A", false);