Commit 6e55f320 authored Jul 03, 2019 by Steven Rostedt (VMware)

ftrace/selftest: Test if set_event/ftrace_pid exists before writing



While testing on a very old kernel (3.5), the tests failed because the write
to set_event_pid in the setup code, did not exist. The tests themselves
could pass, but the setup failed causing an error.

Other files test for existance before writing to them. Do the same for
set_event_pid and set_ftrace_pid.

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

parent cbd965bd

tools/testing/selftests/ftrace/test.d/functions

+2 −2

Original line number	Diff line number	Diff line
		@@ -91,8 +91,8 @@ initialize_ftrace() { # Reset ftrace to initial-state
		reset_events_filter
		reset_ftrace_filter
		disable_events
		echo > set_event_pid # event tracer is always on
		echo > set_ftrace_pid
		[ -f set_event_pid ] && echo > set_event_pid
		[ -f set_ftrace_pid ] && echo > set_ftrace_pid
		[ -f set_ftrace_filter ] && echo \| tee set_ftrace_*
		[ -f set_graph_function ] && echo \| tee set_graph_*
		[ -f stack_trace_filter ] && echo > stack_trace_filter