Revert update for dirty_ratio for memcg.

The flags added by commit db16d5e
has no user now. We believe we'll use it soon but considering
patch reviewing, the change itself should be folded into incoming
set of "dirty ratio for memcg" patches.

So, it's better to drop this change from current mainline tree.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Greg Thelen <gthelen@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/page_cgroup.h

@@ -42,9 +42,6 @@ enum {
 	/* flags for mem_cgroup and file and I/O status */
 	PCG_MOVE_LOCK, /* For race between move_account v.s. following bits */
 	PCG_FILE_MAPPED, /* page is accounted as "mapped" */
-	PCG_FILE_DIRTY, /* page is dirty */
-	PCG_FILE_WRITEBACK, /* page is under writeback */
-	PCG_FILE_UNSTABLE_NFS, /* page is NFS unstable */
 	/* No lock in page_cgroup */
 	PCG_ACCT_LRU, /* page has been accounted for (under lru_lock) */
 };
@@ -65,10 +62,6 @@ static inline void ClearPageCgroup##uname(struct page_cgroup *pc)	\
 static inline int TestClearPageCgroup##uname(struct page_cgroup *pc)	\
 	{ return test_and_clear_bit(PCG_##lname, &pc->flags);  }
 
-#define TESTSETPCGFLAG(uname, lname)			\
-static inline int TestSetPageCgroup##uname(struct page_cgroup *pc)	\
-	{ return test_and_set_bit(PCG_##lname, &pc->flags);  }
-
 /* Cache flag is set only once (at allocation) */
 TESTPCGFLAG(Cache, CACHE)
 CLEARPCGFLAG(Cache, CACHE)
@@ -88,22 +81,6 @@ SETPCGFLAG(FileMapped, FILE_MAPPED)
 CLEARPCGFLAG(FileMapped, FILE_MAPPED)
 TESTPCGFLAG(FileMapped, FILE_MAPPED)
 
-SETPCGFLAG(FileDirty, FILE_DIRTY)
-CLEARPCGFLAG(FileDirty, FILE_DIRTY)
-TESTPCGFLAG(FileDirty, FILE_DIRTY)
-TESTCLEARPCGFLAG(FileDirty, FILE_DIRTY)
-TESTSETPCGFLAG(FileDirty, FILE_DIRTY)
-
-SETPCGFLAG(FileWriteback, FILE_WRITEBACK)
-CLEARPCGFLAG(FileWriteback, FILE_WRITEBACK)
-TESTPCGFLAG(FileWriteback, FILE_WRITEBACK)
-
-SETPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
-CLEARPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
-TESTPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
-TESTCLEARPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
-TESTSETPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
-
 SETPCGFLAG(Migration, MIGRATION)
 CLEARPCGFLAG(Migration, MIGRATION)
 TESTPCGFLAG(Migration, MIGRATION)