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" <paul...@linux.vnet.ibm.com>
Signed-off-by: Alexander Gordeev <agord...@redhat.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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