linux-kernel - [PATCH tip/core/rcu 13/20] rcu: Remove redundant nxttail index macro define

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Message-Id: <1519681990-31349-13-git-send-email-paulmck@linux.vnet.ibm.com>
Date:   Mon, 26 Feb 2018 13:53:03 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com,
        "Liu, Changcheng" <changcheng.liu@...el.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 13/20] rcu: Remove redundant nxttail index macro define

From: "Liu, Changcheng" <changcheng.liu@...el.com>

RCU's nxttail has been optimized to be a rcu_segcblist, which is
a multi-tailed linked list with macros defined for the indexes for
each tail.  The indexes have been defined in linux/rcu_segcblist.h,
so this commit removes the redundant definitions in kernel/rcu/tree.h.

Signed-off-by: Liu Changcheng <changcheng.liu@...el.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 2edd56397b00..f491ab4f2e8e 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -178,13 +178,6 @@ 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 : */
-- 
2.5.2