rcu: Remove unused but set variable

Since commit 7ec99de36f40 ("rcu: Provide exact CPU-online tracking for
RCU"), the variable mask in rcu_init_percpu_data is set but no longer
used. Remove it to fix the following warning when building with 'W=1':

  kernel/rcu/tree.c: In function ‘rcu_init_percpu_data’:
  kernel/rcu/tree.c:3765:16: warning: variable ‘mask’ set but not used [-Wunused-but-set-variable]

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 0 insertions, 2 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 6232d2f9a84e..83bf054e194e 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3765,7 +3765,6 @@ static void
 rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
 {
         unsigned long flags;
-        unsigned long mask;
         struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
         struct rcu_node *rnp = rcu_get_root(rsp);
 
@@ -3788,7 +3787,6 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
          * of the next grace period.
          */
         rnp = rdp->mynode;
-        mask = rdp->grpmask;
         raw_spin_lock_rcu_node(rnp);            /* irqs already disabled. */
         if (!rdp->beenonline)
                 WRITE_ONCE(rsp->ncpus, READ_ONCE(rsp->ncpus) + 1);