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struct page {
	memdesc_flags_t flags;
	union {
		struct {
			union {
				struct list_head lru;
				struct list_head buddy_list;
				struct list_head pcp_list;
				struct llist_node pcp_llist;
			};
			struct address_space *mapping;
			union {
				pgoff_t __folio_index;		/* Our offset within mapping. */
				unsigned long share;	/* share count for fsdax */
			};
			unsigned long private;
		};
		struct {
			unsigned long pp_magic;
			struct page_pool *pp;
			unsigned long _pp_mapping_pad;
			unsigned long dma_addr;
			atomic_long_t pp_ref_count;
		};
		struct {
			unsigned long compound_head;
		};
		struct {
			void *_unused_pgmap_compound_head;
			void *zone_device_data;
		};
		struct rcu_head rcu_head;
	};

	union {
		unsigned int page_type;
		atomic_t _mapcount;
	};
	atomic_t _refcount;