[lttng-dev] [PATCH lttng-modules 2/5] Fix: rcu: Remove wrapper definitions for obsolete RCU... (v5.1)

[Michael Jeanson]

See upstream commit :

commit 6ba7d681aca22e53385bdb35b1d7662e61905760
Author: Paul E. McKenney <paulmck at linux.ibm.com>
Date:   Wed Jan 9 15:22:03 2019 -0800

    rcu: Remove wrapper definitions for obsolete RCU update functions

    None of synchronize_rcu_bh, synchronize_rcu_bh_expedited, call_rcu_bh,
    rcu_barrier_bh, synchronize_sched, synchronize_sched_expedited,
    call_rcu_sched, rcu_barrier_sched, get_state_synchronize_sched, and
    cond_synchronize_sched are actually used.  This commit therefore removes
    their trivial wrapper-function definitions.
---
 lttng-events.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lttng-events.c b/lttng-events.c
index 566080a..f4206c5 100644
--- a/lttng-events.c
+++ b/lttng-events.c
@@ -75,7 +75,12 @@ int _lttng_field_statedump(struct lttng_session *session,
 
 void synchronize_trace(void)
 {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
+	synchronize_rcu();
+#else
 	synchronize_sched();
+#endif
+
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
 #ifdef CONFIG_PREEMPT_RT_FULL
 	synchronize_rcu();
-- 
2.17.1