[PATCH] rcu: remove redundant nxttail index marco define

["Liu, Changcheng" <changcheng.liu@intel.com>]

rcu nxttail has been optimized to be rcu_segcblist.
The index has been defined in linux/rcu_segcblist.h

Signed-off-by: Liu Changcheng <changcheng.liu@intel.com>

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 46a5d19..78cb5f3 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -185,13 +185,6 @@ union rcu_noqs {
 	u16 s; /* Set of bits, aggregate OR here. */
 };
 
-/* Index values for nxttail array in struct rcu_data. */
-#define RCU_DONE_TAIL		0	/* Also RCU_WAIT head. */
-#define RCU_WAIT_TAIL		1	/* Also RCU_NEXT_READY head. */
-#define RCU_NEXT_READY_TAIL	2	/* Also RCU_NEXT head. */
-#define RCU_NEXT_TAIL		3
-#define RCU_NEXT_SIZE		4
-
 /* Per-CPU data for read-copy update. */
 struct rcu_data {
 	/* 1) quiescent-state and grace-period handling : */
-- 
2.7.4