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rcu: Eliminate redundant NULL-pointer check

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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>
This commit is contained in:
Paul E. McKenney 2019-03-21 16:29:50 -07:00
parent 5d8a752e31
commit a2badefa85
1 changed files with 2 additions and 5 deletions
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7
kernel/rcu/tree_plugin.h
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@ -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);
}