See upstream commit :
commit 6ba7d681aca22e53385bdb35b1d7662e61905760
Author: Paul E. McKenney <paul...@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
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