[PATCH] mm: fix swap unused warning

If CONFIG_SWAP is not defined we get:

mm/vmscan.c: In function â\80\98remove_mappingâ\80\99:
mm/vmscan.c:387: warning: unused variable â\80\98swapâ\80\99

Convert defines in swap.h into blank inline functions to fix this warning
and be consistent.

Signed-off-by: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 1cf234e..f1a827a 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -282,18 +282,60 @@ static inline void disable_swap_token(void)
 #define free_pages_and_swap_cache(pages, nr) \
        release_pages((pages), (nr), 0);
 
-#define show_swap_cache_info()                 /*NOTHING*/
-#define free_swap_and_cache(swp)               /*NOTHING*/
-#define swap_duplicate(swp)                    /*NOTHING*/
-#define swap_free(swp)                         /*NOTHING*/
-#define read_swap_cache_async(swp,vma,addr)    NULL
-#define lookup_swap_cache(swp)                 NULL
-#define valid_swaphandles(swp, off)            0
+static inline void show_swap_cache_info(void)
+{
+}
+
+static inline void free_swap_and_cache(swp_entry_t swp)
+{
+}
+
+static inline int swap_duplicate(swp_entry_t swp)
+{
+       return 0;
+}
+
+static inline void swap_free(swp_entry_t swp)
+{
+}
+
+static inline struct page *read_swap_cache_async(swp_entry_t swp,
+                       struct vm_area_struct *vma, unsigned long addr)
+{
+       return NULL;
+}
+
+static inline struct page *lookup_swap_cache(swp_entry_t swp)
+{
+       return NULL;
+}
+
+static inline int valid_swaphandles(swp_entry_t entry, unsigned long *offset)
+{
+       return 0;
+}
+
 #define can_share_swap_page(p)                 (page_mapcount(p) == 1)
-#define move_to_swap_cache(p, swp)             1
-#define move_from_swap_cache(p, i, m)          1
-#define __delete_from_swap_cache(p)            /*NOTHING*/
-#define delete_from_swap_cache(p)              /*NOTHING*/
+
+static inline int move_to_swap_cache(struct page *page, swp_entry_t entry)
+{
+       return 1;
+}
+
+static inline int move_from_swap_cache(struct page *page, unsigned long index,
+                                       struct address_space *mapping)
+{
+       return 1;
+}
+
+static inline void __delete_from_swap_cache(struct page *page)
+{
+}
+
+static inline void delete_from_swap_cache(struct page *page)
+{
+}
+
 #define swap_token_default_timeout             0
 
 static inline int remove_exclusive_swap_page(struct page *p)