Add samsung specific changes

mm/cleancache.c

@@ -10,19 +10,13 @@
  * Author: Dan Magenheimer
  */
 
-#include <linux/bitops.h>
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/exportfs.h>
-#include <linux/gfp.h>
 #include <linux/mm.h>
 #include <linux/debugfs.h>
 #include <linux/cleancache.h>
 
-#ifdef CONFIG_DDAR
-#define AS_SENSITIVE (__GFP_BITS_SHIFT + 5) /* Group of sensitive pages to be cleaned up */
-#endif
-
 /*
  * cleancache_ops is set by cleancache_register_ops to contain the pointers
  * to the cleancache "backend" implementation functions.
@@ -208,15 +202,6 @@ out:
 }
 EXPORT_SYMBOL(__cleancache_get_page);
 
-#ifdef CONFIG_DDAR
-static inline int mapping_sensitive(struct address_space *mapping)
-{
-	if (mapping)
-		return test_bit(AS_SENSITIVE, &mapping->flags);
-	return !!mapping;
-}
-#endif
-
 /*
  * "Put" data from a page to cleancache and associate it with the
  * (previously-obtained per-filesystem) poolid and the page's,
@@ -237,11 +222,6 @@ void __cleancache_put_page(struct page *page)
 		return;
 	}
 
-#ifdef CONFIG_DDAR
-	if (mapping_sensitive(page->mapping))
-		return;
-#endif
-
 	VM_BUG_ON_PAGE(!PageLocked(page), page);
 	pool_id = page->mapping->host->i_sb->cleancache_poolid;
 	if (pool_id >= 0 &&