1  typedef struct
       2  {
       3    unsigned long long pte;
       4  } pte_t;
       5  pte_t mk_swap_pte (unsigned long offset)
       6  {
       7    pte_t pte;
       8    pte.pte = (offset << 40);
       9    return pte;
      10  }
      11  int pte_file (pte_t pte)
      12  {
      13    return pte.pte & (1 << 4);
      14  }
      15  typedef struct
      16  {
      17    unsigned long val;
      18  } swp_entry_t;
      19  pte_t swp_entry_to_pte (swp_entry_t entry)
      20  {
      21    swp_entry_t arch_entry;
      22    arch_entry = (swp_entry_t){mk_swap_pte (swp_offset (entry)).pte};
      23    __BUG_ON ((unsigned long) pte_file ((pte_t) {arch_entry.val}));
      24    return (pte_t) {arch_entry.val};
      25  }