use console lock

console.c

@@ -278,7 +278,7 @@ console_init(void)
 
   devsw[CONSOLE].write = console_write;
   devsw[CONSOLE].read = console_read;
-  //use_console_lock = 1;
+  use_console_lock = 1;
 
   pic_enable(IRQ_KBD);
   ioapic_enable(IRQ_KBD, 0);