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Subject[PATCH] rcu: refine structure rcu_node field for rcu boost
Do not allocate space for rcu boost field when
RCU BOOST is not configured.

Signed-off-by: Liu Changcheng <changcheng.liu@intel.com>

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 46a5d19..88f087e 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -129,6 +129,7 @@ struct rcu_node {
/* if there is no such task. If there */
/* is no current expedited grace period, */
/* then there can cannot be any such task. */
+#ifdef CONFIG_RCU_BOOST
struct list_head *boost_tasks;
/* Pointer to first task that needs to be */
/* priority boosted, or NULL if no priority */
@@ -153,6 +154,8 @@ struct rcu_node {
/* Number of tasks boosted for expedited GP. */
unsigned long n_normal_boosts;
/* Number of tasks boosted for normal GP. */
+#endif/* #ifdef CONFIG_RCU_BOOST*/
+
#ifdef CONFIG_RCU_NOCB_CPU
struct swait_queue_head nocb_gp_wq[2];
/* Place for rcu_nocb_kthread() to wait GP. */
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index db85ca3..fee0b1e 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -506,8 +506,10 @@ void rcu_read_unlock_special(struct task_struct *t)
if (IS_ENABLED(CONFIG_RCU_BOOST)) {
/* Snapshot ->boost_mtx ownership w/rnp->lock held. */
drop_boost_mutex = rt_mutex_owner(&rnp->boost_mtx) == t;
+#ifdef CONFIG_RCU_BOOST
if (&t->rcu_node_entry == rnp->boost_tasks)
rnp->boost_tasks = np;
+#endif
}

/*
--
2.7.4
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