mm: cleancache: clean up cleancache_enabled

cleancache_ops is used to decide whether backend is registered. So now cleancache_enabled is always true if defined CONFIG_CLEANCACHE. Signed-off-by: Bob Liu <[email protected]> Cc: Wanpeng Li <[email protected]> Cc: Andor Daam <[email protected]> Cc: Dan Magenheimer <[email protected]> Cc: Florian Schmaus <[email protected]> Cc: Konrad Rzeszutek Wilk <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Stefan Hengelein <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
sfionov · May 1, 2013 · ff610a1 · ff610a1
1 parent 833f866
commit ff610a1
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Showing 2 changed files with 1 addition and 12 deletions.
diff --git a/include/linux/cleancache.h b/include/linux/cleancache.h
@@ -42,9 +42,9 @@ extern void __cleancache_put_page(struct page *);
 extern void __cleancache_invalidate_page(struct address_space *, struct page *);
 extern void __cleancache_invalidate_inode(struct address_space *);
 extern void __cleancache_invalidate_fs(struct super_block *);
-extern int cleancache_enabled;
 
 #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;

diff --git a/mm/cleancache.c b/mm/cleancache.c
@@ -18,16 +18,6 @@
 #include <linux/debugfs.h>
 #include <linux/cleancache.h>
 
-/*
- * This global enablement flag may be read thousands of times per second
- * by cleancache_get/put/invalidate even on systems where cleancache_ops
- * is not claimed (e.g. cleancache is config'ed on but remains
- * disabled), so is preferred to the slower alternative: a function
- * call that checks a non-global.
- */
-int cleancache_enabled __read_mostly;
-EXPORT_SYMBOL(cleancache_enabled);
-
 /*
  * cleancache_ops is set by cleancache_ops_register to contain the pointers
  * to the cleancache "backend" implementation functions.
@@ -414,7 +404,6 @@ static int __init init_cleancache(void)
 		fs_poolid_map[i] = FS_UNKNOWN;
 		shared_fs_poolid_map[i] = FS_UNKNOWN;
 	}
-	cleancache_enabled = 1;
 	return 0;
 }
 module_init(init_cleancache)