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@@ -296,7 +296,7 @@ static inline void disable_swap_token(void)
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#define read_swap_cache_async(swp,vma,addr) NULL
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#define lookup_swap_cache(swp) NULL
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#define valid_swaphandles(swp, off) 0
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-#define can_share_swap_page(p) 0
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+#define can_share_swap_page(p) (page_mapcount(p) == 1)
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#define move_to_swap_cache(p, swp) 1
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#define move_from_swap_cache(p, i, m) 1
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#define __delete_from_swap_cache(p) /*NOTHING*/
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