unsigned long private; /* Mapping-private opaque data:
* usually used for buffer_heads
* if PagePrivate set; used for
- * swp_entry_t if PageSwapCache.
- * When page is free, this
+ * swp_entry_t if PageSwapCache;
* indicates order in the buddy
- * system.
+ * system if PG_buddy is set.
*/
struct address_space *mapping; /* If low bit clear, points to
* inode address_space, or NULL.