The tracepoint interface will stop providing regular RCU context; make
sure we do it ourselves, since perf makes use of regular RCU protected
data.
Suggested-by: Steven Rostedt (VMware) <rosted@xxxxxxxxxxx>
Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
kernel/events/core.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8950,6 +8950,7 @@ void perf_tp_event(u16 event_type, u64 c
{
struct perf_sample_data data;
struct perf_event *event;
+ unsigned long rcu_flags;
struct perf_raw_record raw = {
.frag = {
@@ -8961,6 +8962,8 @@ void perf_tp_event(u16 event_type, u64 c
perf_sample_data_init(&data, 0, 0);
data.raw = &raw;
+ rcu_flags = trace_rcu_enter();
+
perf_trace_buf_update(record, event_type);
hlist_for_each_entry_rcu(event, head, hlist_entry) {
@@ -8996,6 +8999,8 @@ void perf_tp_event(u16 event_type, u64 c
}
perf_swevent_put_recursion_context(rctx);
+
+ trace_rcu_exit(rcu_flags);
}
EXPORT_SYMBOL_GPL(perf_tp_event);
