rcu: Eliminate redundant NULL-pointer check

Because rcu_wake_cond() checks for a null task_struct pointer, there is
no need for its callers to do so.  This commit eliminates the redundant
check.

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

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index f0aeb7416dccf99f8b4d48405c509fdebb4213b4..81d3cd821891bc2feaf7e6a5b682ee517ddab807 100644 (file)
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1191,8 +1191,6 @@ static int rcu_boost_kthread(void *arg)
 static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
        __releases(rnp->lock)
 {
-       struct task_struct *t;
-
        raw_lockdep_assert_held_rcu_node(rnp);
        if (!rcu_preempt_blocked_readers_cgp(rnp) && rnp->exp_tasks == NULL) {
                raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
@@ -1206,9 +1204,8 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
                if (rnp->exp_tasks == NULL)
                        rnp->boost_tasks = rnp->gp_tasks;
                raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
-               t = rnp->boost_kthread_task;
-               if (t)
-                       rcu_wake_cond(t, rnp->boost_kthread_status);
+               rcu_wake_cond(rnp->boost_kthread_task,
+                             rnp->boost_kthread_status);
        } else {
                raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
        }