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SubjectRe: [PATCH] tracing: Fix trace_event_raw_event_synth() if else statement
On Tue, 31 Jan 2023 09:52:37 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
>
> The test to check if the field is a stack is to be done if it is not a
> string. But the code had:
>
> } if (event->fields[i]->is_stack) {
>
> and not
>
> } else if (event->fields[i]->is_stack) {
>
> which would cause it to always be tested. Worse yet, this also included an
> "else" statement that was only to be called if the field was not a string
> and a stack, but this code allows it to be called if it was a string (and
> not a stack).
>
> Also fixed some whitespace issues.
>

Looks good to me.

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

Hmm, I need to add more tests for syntax events...

Thanks!


> Link: https://lore.kernel.org/all/202301302110.mEtNwkBD-lkp@intel.com/
>
> Fixes: 00cf3d672a9d ("tracing: Allow synthetic events to pass around stacktraces")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
> ---
> kernel/trace/trace_events_synth.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
> index adb630633f31..306c89e0ce55 100644
> --- a/kernel/trace/trace_events_synth.c
> +++ b/kernel/trace/trace_events_synth.c
> @@ -564,8 +564,8 @@ static notrace void trace_event_raw_event_synth(void *__data,
> event->fields[i]->is_dynamic,
> data_size, &n_u64);
> data_size += len; /* only dynamic string increments */
> - } if (event->fields[i]->is_stack) {
> - long *stack = (long *)(long)var_ref_vals[val_idx];
> + } else if (event->fields[i]->is_stack) {
> + long *stack = (long *)(long)var_ref_vals[val_idx];
>
> len = trace_stack(entry, event, stack,
> data_size, &n_u64);
> --
> 2.39.0
>


--
Masami Hiramatsu (Google) <mhiramat@kernel.org>

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