rcu: Remove redundant callback-list initialization

The RCU callback lists are initialized in both rcu_boot_init_percpu_data()
and rcu_init_percpu_data().  The former is intended for initializing
immutable data, so this commit removes the initialization from
rcu_boot_init_percpu_data() and leaves it in rcu_init_percpu_data().
This change prepares for permitting callbacks to be queued very early
in boot.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 4ed2c2842103..febd0f72a3c9 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3419,9 +3419,6 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
         /* Set up local state, ensuring consistent view of global state. */
         raw_spin_lock_irqsave(&rnp->lock, flags);
         rdp->grpmask = 1UL << (cpu - rdp->mynode->grplo);
-        init_callback_list(rdp);
-        rdp->qlen_lazy = 0;
-        ACCESS_ONCE(rdp->qlen) = 0;
         rdp->dynticks = &per_cpu(rcu_dynticks, cpu);
         WARN_ON_ONCE(rdp->dynticks->dynticks_nesting != DYNTICK_TASK_EXIT_IDLE);
         WARN_ON_ONCE(atomic_read(&rdp->dynticks->dynticks) != 1);