1  enum zone_type {
       2    ZONE_DMA,
       3    ZONE_NORMAL,
       4    ZONE_MOVABLE,
       5    MAX_NR_ZONES
       6  };
       7  static unsigned long arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
       8  static unsigned long arch_zone_highest_possible_pfn[MAX_NR_ZONES];
       9  void free_area_init_nodes(unsigned long *max_zone_pfn)
      10  {
      11    enum zone_type i;
      12    for (i = 1; i < MAX_NR_ZONES; i++)
      13    {
      14      if (i == ZONE_MOVABLE)
      15        continue;
      16      unsigned long _x = max_zone_pfn[i];
      17      unsigned long _y = arch_zone_lowest_possible_pfn[i];
      18      arch_zone_highest_possible_pfn[i] = _x > _y ? _x : _y;
      19    }
      20  }