tracing: Do a WARN_ON() if start_thread() in hwlat is called when thread 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: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 82fbc8c4
...@@ -354,7 +354,7 @@ static int start_kthread(struct trace_array *tr) ...@@ -354,7 +354,7 @@ static int start_kthread(struct trace_array *tr)
struct task_struct *kthread; struct task_struct *kthread;
int next_cpu; int next_cpu;
if (hwlat_kthread) if (WARN_ON(hwlat_kthread))
return 0; return 0;
/* Just pick the first CPU on first iteration */ /* Just pick the first CPU on first iteration */
......
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