tracing: Do a WARN_ON() if start_thread() in hwlat is called when thr…

…ead exists The start function of the hwlat tracer should never be called when the hwlat thread already exists. If it is called, do a WARN_ON(). Signed-off-by: Steven Rostedt (VMware) <[email protected]>
sm00th · Aug 1, 2018 · 978defe · 978defe
1 parent 82fbc8c
commit 978defe
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
@@ -354,7 +354,7 @@ static int start_kthread(struct trace_array *tr)
 	struct task_struct *kthread;
 	int next_cpu;
 
-	if (hwlat_kthread)
+	if (WARN_ON(hwlat_kthread))
 		return 0;
 
 	/* Just pick the first CPU on first iteration */