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SubjectRe: [PATCH 2/2] ftrace/selftest: Test if set_event/ftrace_pid exists before writing
On Wed, 03 Jul 2019 15:50:01 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

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

Oops, I've missed it.

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

Looks good to me,

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>

Thank you!

>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> ---
> tools/testing/selftests/ftrace/test.d/functions | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
> index 779ec11f61bd..a7b06291e32c 100644
> --- a/tools/testing/selftests/ftrace/test.d/functions
> +++ b/tools/testing/selftests/ftrace/test.d/functions
> @@ -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 # event tracer is always on
> + [ -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
> --
> 2.20.1
>
>


--
Masami Hiramatsu <mhiramat@kernel.org>

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