1  void foo(){
       2    __builtin___clear_cache(0, 0);
       3  }
       4  
       5  void foo1(){
       6    __builtin___clear_cache((void*)0, (void*)0);
       7  }
       8  
       9  void foo2(){
      10    void *yy = 0;
      11    __builtin___clear_cache(yy, yy);
      12  }
      13  
      14  void foo3(){
      15    void *yy = (void*)0x1000;
      16    __builtin___clear_cache(yy, yy);
      17  }
      18