trace: Call tracing_reset_online_cpus before tracer->init()

Impact: cleanup

To make it easy for ftrace plugin writers, as this was open coded in
the existing plugins

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Frédéric Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 1 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8fad3776e843..ef4dbac95568 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2171,6 +2171,12 @@ tracing_set_trace_read(struct file *filp, char __user *ubuf,
         return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
+int tracer_init(struct tracer *t, struct trace_array *tr)
+{
+        tracing_reset_online_cpus(tr);
+        return t->init(tr);
+}
+
 static int tracing_set_tracer(const char *buf)
 {
         struct trace_array *tr = &global_trace;
@@ -2195,7 +2201,7 @@ static int tracing_set_tracer(const char *buf)
 
         current_trace = t;
         if (t->init) {
-                ret = t->init(tr);
+                ret = tracer_init(t, tr);
                 if (ret)
                         goto out;
         }