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typedef struct

{

  unsigned long long pte;

} pte_t;

pte_t mk_swap_pte (unsigned long offset)

{

  pte_t pte;

  pte.pte = (offset << 40);

  return pte;

}

int pte_file (pte_t pte)

{

  return pte.pte & (1 << 4);

}

typedef struct

{

  unsigned long val;

} swp_entry_t;

pte_t swp_entry_to_pte (swp_entry_t entry)

{

  swp_entry_t arch_entry;

  arch_entry = (swp_entry_t){mk_swap_pte (swp_offset (entry)).pte};

  __BUG_ON ((unsigned long) pte_file ((pte_t) {arch_entry.val}));

  return (pte_t) {arch_entry.val};

}