1 files changed, 17 insertions, 25 deletions

diff --git a/include/linux/swap.h b/include/linux/swap.h
index d476aad3ff57..0cedf31af0b0 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -129,9 +129,10 @@ enum {
 
 #define SWAP_CLUSTER_MAX 32
 
-#define SWAP_MAP_MAX    0x7fff
-#define SWAP_MAP_BAD    0x8000
-
+#define SWAP_MAP_MAX    0x7ffe
+#define SWAP_MAP_BAD    0x7fff
+#define SWAP_HAS_CACHE  0x8000          /* There is a swap cache of entry. */
+#define SWAP_COUNT_MASK (~SWAP_HAS_CACHE)
 /*
  * The in-memory structure used to track swap areas.
  */
@@ -235,7 +236,6 @@ static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
 }
 #endif
 
-#ifdef CONFIG_UNEVICTABLE_LRU
 extern int page_evictable(struct page *page, struct vm_area_struct *vma);
 extern void scan_mapping_unevictable_pages(struct address_space *);
 
@@ -244,24 +244,6 @@ extern int scan_unevictable_handler(struct ctl_table *, int, struct file *,
                                         void __user *, size_t *, loff_t *);
 extern int scan_unevictable_register_node(struct node *node);
 extern void scan_unevictable_unregister_node(struct node *node);
-#else
-static inline int page_evictable(struct page *page,
-                                                struct vm_area_struct *vma)
-{
-        return 1;
-}
-
-static inline void scan_mapping_unevictable_pages(struct address_space *mapping)
-{
-}
-
-static inline int scan_unevictable_register_node(struct node *node)
-{
-        return 0;
-}
-
-static inline void scan_unevictable_unregister_node(struct node *node) { }
-#endif
 
 extern int kswapd_run(int nid);
 
@@ -274,7 +256,7 @@ extern void swap_unplug_io_fn(struct backing_dev_info *, struct page *);
 
 #ifdef CONFIG_SWAP
 /* linux/mm/page_io.c */
-extern int swap_readpage(struct file *, struct page *);
+extern int swap_readpage(struct page *);
 extern int swap_writepage(struct page *page, struct writeback_control *wbc);
 extern void end_swap_bio_read(struct bio *bio, int err);
 
@@ -300,9 +282,11 @@ extern long total_swap_pages;
 extern void si_swapinfo(struct sysinfo *);
 extern swp_entry_t get_swap_page(void);
 extern swp_entry_t get_swap_page_of_type(int);
-extern int swap_duplicate(swp_entry_t);
+extern void swap_duplicate(swp_entry_t);
+extern int swapcache_prepare(swp_entry_t);
 extern int valid_swaphandles(swp_entry_t, unsigned long *);
 extern void swap_free(swp_entry_t);
+extern void swapcache_free(swp_entry_t, struct page *page);
 extern int free_swap_and_cache(swp_entry_t);
 extern int swap_type_of(dev_t, sector_t, struct block_device **);
 extern unsigned int count_swap_pages(int, int);
@@ -370,12 +354,20 @@ static inline void show_swap_cache_info(void)
 }
 
 #define free_swap_and_cache(swp)        is_migration_entry(swp)
-#define swap_duplicate(swp)             is_migration_entry(swp)
+#define swapcache_prepare(swp)          is_migration_entry(swp)
+
+static inline void swap_duplicate(swp_entry_t swp)
+{
+}
 
 static inline void swap_free(swp_entry_t swp)
 {
 }
 
+static inline void swapcache_free(swp_entry_t swp, struct page *page)
+{
+}
+
 static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
                         struct vm_area_struct *vma, unsigned long addr)
 {