linux-kernel - [PATCH 10/10] rcu: Remove unnecessary grpnum field from rcu

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Date:	Mon,  9 Mar 2015 09:34:14 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH 10/10] rcu: Remove unnecessary grpnum field from rcu_node structure

Field rcu_node::grpnum is used to set rcu_node::grpmask at init
and never accessed afterwards. There is no reason to have it.

Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 kernel/rcu/tree.c | 5 ++---
 kernel/rcu/tree.h | 3 +--
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 1cc1286..6afcf8f 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3963,12 +3963,11 @@ static void __init rcu_init_one(struct rcu_state *rsp,
 			if (rnp->grphi >= nr_cpu_ids)
 				rnp->grphi = nr_cpu_ids - 1;
 			if (i == 0) {
-				rnp->grpnum = 0;
 				rnp->grpmask = 0;
 				rnp->parent = NULL;
 			} else {
-				rnp->grpnum = j % levelspread[i - 1];
-				rnp->grpmask = 1UL << rnp->grpnum;
+				int grpnum = j % levelspread[i - 1];
+				rnp->grpmask = 1UL << grpnum;
 				rnp->parent = rsp->level[i - 1] +
 					      j / levelspread[i - 1];
 			}
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index f12fe83..bd66e85 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -151,8 +151,7 @@ struct rcu_node {
 				/*  Only one bit will be set in this mask. */
 	int	grplo;		/* lowest-numbered CPU or group here. */
 	int	grphi;		/* highest-numbered CPU or group here. */
-	u8	grpnum;		/* CPU/group number for next level up. */
-	u8	level;		/* root is at level 0. */
+	int	level;		/* root is at level 0. */
 	bool	wait_blkd_tasks;/* Necessary to wait for blocked tasks to */
 				/*  exit RCU read-side critical sections */
 				/*  before propagating offline up the */
-- 
1.8.3.1

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