staging: ramster: fix build warnings

Fix build warnings resulting from in-progress work that was
not entirely ifdef'd out.

Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ramster/zcache-main.c

@@ -449,16 +449,18 @@ static struct page *zcache_alloc_page(void)
 	return page;
 }
 
+#ifdef FRONTSWAP_HAS_UNUSE
 static void zcache_unacct_page(void)
 {
 	zcache_pageframes_freed =
 		atomic_inc_return(&zcache_pageframes_freed_atomic);
 }
+#endif
 
 static void zcache_free_page(struct page *page)
 {
 	long curr_pageframes;
-	static long max_pageframes, min_pageframes, total_freed;
+	static long max_pageframes, min_pageframes;
 
 	if (page == NULL)
 		BUG();
@@ -965,9 +967,10 @@ static struct page *zcache_evict_eph_pageframe(void)
 	return page;
 }
 
+#ifdef FRONTSWAP_HAS_UNUSE
 static void unswiz(struct tmem_oid oid, u32 index,
 				unsigned *type, pgoff_t *offset);
-#ifdef FRONTSWAP_HAS_UNUSE
+
 /*
  *  Choose an LRU persistent pageframe and attempt to "unuse" it by
  *  calling frontswap_unuse on both zpages.
@@ -1060,7 +1063,9 @@ static int shrink_zcache_memory(struct shrinker *shrink,
 	int nr_evict = 0;
 	int nr_unuse = 0;
 	struct page *page;
+#ifdef FRONTSWAP_HAS_UNUSE
 	int unuse_ret;
+#endif
 
 	if (nr <= 0)
 		goto skip_evict;
@@ -1519,13 +1524,15 @@ static inline struct tmem_oid oswiz(unsigned type, u32 ind)
 	return oid;
 }
 
+#ifdef FRONTSWAP_HAS_UNUSE
 static void unswiz(struct tmem_oid oid, u32 index,
 				unsigned *type, pgoff_t *offset)
 {
 	*type = (unsigned)(oid.oid[0] >> SWIZ_BITS);
 	*offset = (pgoff_t)((index << SWIZ_BITS) |
 			(oid.oid[0] & SWIZ_MASK));
 }
+#endif
 
 static int zcache_frontswap_put_page(unsigned type, pgoff_t offset,
 					struct page *page)
@@ -1535,7 +1542,6 @@ static int zcache_frontswap_put_page(unsigned type, pgoff_t offset,
 	struct tmem_oid oid = oswiz(type, ind);
 	int ret = -1;
 	unsigned long flags;
-	int unuse_ret;
 
 	BUG_ON(!PageLocked(page));
 	if (!disable_frontswap_ignore_nonactive && !PageWasActive(page)) {