[PATCH RT 6/6] rcu: disable more spots of rcu_bh
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: 2016-02-12 23:02:59
Also in:
lkml
Subsystem:
read-copy update (rcu), the rest · Maintainers:
"Paul E. McKenney", Frederic Weisbecker, Neeraj Upadhyay, Joel Fernandes, Josh Triplett, Boqun Feng, Uladzislau Rezki, Linus Torvalds
We don't use ru_bh on -RT but we still fork a thread for it and keep it as a flavour. No more. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- kernel/rcu/tree.c | 6 ++++++ kernel/rcu/tree.h | 2 ++ 2 files changed, 8 insertions(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 5359091fecaa..64098d35de19 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c@@ -454,11 +454,13 @@ EXPORT_SYMBOL_GPL(rcu_batches_started_sched); /* * Return the number of RCU BH batches started thus far for debug & stats. */ +#ifndef CONFIG_PREEMPT_RT_FULL unsigned long rcu_batches_started_bh(void) { return rcu_bh_state.gpnum; } EXPORT_SYMBOL_GPL(rcu_batches_started_bh); +#endif /* * Return the number of RCU batches completed thus far for debug & stats.
@@ -563,9 +565,11 @@ void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags, case RCU_FLAVOR: rsp = rcu_state_p; break; +#ifndef CONFIG_PREEMPT_RT_FULL case RCU_BH_FLAVOR: rsp = &rcu_bh_state; break; +#endif case RCU_SCHED_FLAVOR: rsp = &rcu_sched_state; break;
@@ -4695,7 +4699,9 @@ void __init rcu_init(void) rcu_bootup_announce(); rcu_init_geometry(); +#ifndef CONFIG_PREEMPT_RT_FULL rcu_init_one(&rcu_bh_state, &rcu_bh_data); +#endif rcu_init_one(&rcu_sched_state, &rcu_sched_data); if (dump_tree) rcu_dump_rcu_node_tree(&rcu_sched_state);
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 588509d94bbd..2ba8f6c2e81e 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h@@ -557,7 +557,9 @@ extern struct list_head rcu_struct_flavors; */ extern struct rcu_state rcu_sched_state; +#ifndef CONFIG_PREEMPT_RT_FULL extern struct rcu_state rcu_bh_state; +#endif #ifdef CONFIG_PREEMPT_RCU extern struct rcu_state rcu_preempt_state;
--
2.7.0