Commit 978defee authored Aug 01, 2018 by Steven Rostedt (VMware)

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: Steven Rostedt (VMware) <rostedt@goodmis.org>

parent 82fbc8c4

kernel/trace/trace_hwlat.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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 */