ftrace: return EOF in trace_pipe on change of tracer
Break out of while loop with EOF when the current_trace changes.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d141fc9..2af9404 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2253,6 +2253,9 @@
if (signal_pending(current))
return -EINTR;
+ if (iter->trace != current_trace)
+ return 0;
+
/*
* We block until we read something and tracing is disabled.
* We still block if tracing is disabled, but we have never