Merge branch 'stable/for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mm

Pull cleancache cleanups from Konrad Rzeszutek Wilk:
 "Simple cleanups"

* 'stable/for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mm:
  include/linux/cleancache.h: Clean up code
  cleancache: constify cleancache_ops structure

3 files changed, 10 insertions, 12 deletions

diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c
index 945fc4327201..4ac2ca8a7656 100644
--- a/drivers/xen/tmem.c
+++ b/drivers/xen/tmem.c
@@ -242,7 +242,7 @@ static int tmem_cleancache_init_shared_fs(char *uuid, size_t pagesize)
         return xen_tmem_new_pool(shared_uuid, TMEM_POOL_SHARED, pagesize);
 }
 
-static struct cleancache_ops tmem_cleancache_ops = {
+static const struct cleancache_ops tmem_cleancache_ops = {
         .put_page = tmem_cleancache_put_page,
         .get_page = tmem_cleancache_get_page,
         .invalidate_page = tmem_cleancache_flush_page,
diff --git a/include/linux/cleancache.h b/include/linux/cleancache.h
index bda5ec0b4b4d..fccf7f44139d 100644
--- a/include/linux/cleancache.h
+++ b/include/linux/cleancache.h
@@ -37,7 +37,7 @@ struct cleancache_ops {
         void (*invalidate_fs)(int);
 };
 
-extern int cleancache_register_ops(struct cleancache_ops *ops);
+extern int cleancache_register_ops(const struct cleancache_ops *ops);
 extern void __cleancache_init_fs(struct super_block *);
 extern void __cleancache_init_shared_fs(struct super_block *);
 extern int  __cleancache_get_page(struct page *);
@@ -48,14 +48,14 @@ extern void __cleancache_invalidate_fs(struct super_block *);
 
 #ifdef CONFIG_CLEANCACHE
 #define cleancache_enabled (1)
-static inline bool cleancache_fs_enabled(struct page *page)
-{
-        return page->mapping->host->i_sb->cleancache_poolid >= 0;
-}
 static inline bool cleancache_fs_enabled_mapping(struct address_space *mapping)
 {
         return mapping->host->i_sb->cleancache_poolid >= 0;
 }
+static inline bool cleancache_fs_enabled(struct page *page)
+{
+        return cleancache_fs_enabled_mapping(page->mapping);
+}
 #else
 #define cleancache_enabled (0)
 #define cleancache_fs_enabled(_page) (0)
@@ -89,11 +89,9 @@ static inline void cleancache_init_shared_fs(struct super_block *sb)
 
 static inline int cleancache_get_page(struct page *page)
 {
-        int ret = -1;
-
         if (cleancache_enabled && cleancache_fs_enabled(page))
-                ret = __cleancache_get_page(page);
-        return ret;
+                return __cleancache_get_page(page);
+        return -1;
 }
 
 static inline void cleancache_put_page(struct page *page)
diff --git a/mm/cleancache.c b/mm/cleancache.c
index 8fc50811119b..ba5d8f3e6d68 100644
--- a/mm/cleancache.c
+++ b/mm/cleancache.c
@@ -22,7 +22,7 @@
  * cleancache_ops is set by cleancache_register_ops to contain the pointers
  * to the cleancache "backend" implementation functions.
  */
-static struct cleancache_ops *cleancache_ops __read_mostly;
+static const struct cleancache_ops *cleancache_ops __read_mostly;
 
 /*
  * Counters available via /sys/kernel/debug/cleancache (if debugfs is
@@ -49,7 +49,7 @@ static void cleancache_register_ops_sb(struct super_block *sb, void *unused)
 /*
  * Register operations for cleancache. Returns 0 on success.
  */
-int cleancache_register_ops(struct cleancache_ops *ops)
+int cleancache_register_ops(const struct cleancache_ops *ops)
 {
         if (cmpxchg(&cleancache_ops, NULL, ops))
                 return -EBUSY;