linux-kernel - Re: [PATCH] perf trace: Remove return value of trace__fprintf_tp

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Message-ID: <CAH0uvohQvqRYo8JBX_Z1yVobqcxRgQG4G1Y8o8XMv18CnrqBbA@mail.gmail.com>
Date: Tue, 21 Jan 2025 19:01:53 -0800
From: Howard Chu <howardchu95@...il.com>
To: Benjamin Peterson <benjamin@...flow.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf trace: Remove return value of trace__fprintf_tp_fields

Hello fellow maintainers,

Just a slight ping.

Thanks,
Howard

On Fri, Dec 13, 2024 at 10:06 AM Howard Chu <howardchu95@...il.com> wrote:
>
> Hello Benjamin,
>
> On Thu, Dec 12, 2024 at 7:56 PM Benjamin Peterson <benjamin@...flow.com> wrote:
> >
> > The return value of this function was meaningless and therefore ignored by
> > the caller. Remove it.
> >
> > Signed-off-by: Benjamin Peterson <benjamin@...flow.com>
> > ---
> > This is a small followup cleanup to my earlier commit 5fb8e56542a3 ("perf
> > trace: avoid garbage when not printing a trace event's arguments").
> > ---
> >  tools/perf/builtin-trace.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> > index 6a1a128fe645014d0347ad4ec3e0c9e77ec59aee..246be66fd59a4b9d76e4d3c42b68d0a444ca366a 100644
> > --- a/tools/perf/builtin-trace.c
> > +++ b/tools/perf/builtin-trace.c
> > @@ -3022,8 +3022,8 @@ static void bpf_output__fprintf(struct trace *trace,
> >         ++trace->nr_events_printed;
> >  }
> >
> > -static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel, struct perf_sample *sample,
> > -                                      struct thread *thread, void *augmented_args, int augmented_args_size)
> > +static void trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel, struct perf_sample *sample,
> > +                                    struct thread *thread, void *augmented_args, int augmented_args_size)
> >  {
> >         char bf[2048];
> >         size_t size = sizeof(bf);
> > @@ -3088,7 +3088,7 @@ static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel,
> >                 printed += syscall_arg_fmt__scnprintf_val(arg, bf + printed, size - printed, &syscall_arg, val);
> >         }
> >
> > -       return printed + fprintf(trace->output, "%.*s", (int)printed, bf);
> > +       fprintf(trace->output, "%.*s", (int)printed, bf);
> >  }
> >
> >  static int trace__event_handler(struct trace *trace, struct evsel *evsel,
> >
> > ---
> > base-commit: eefa7a9c069908412f8f5d15833901d1b46ae1b2
> > change-id: 20241212-void-fprintf_tp_fields-8aaae2f5525f
> >
> > Best regards,
> > --
> > Benjamin Peterson <benjamin@...flow.com>
> >
> >
>
> Thank you for the follow-up patch, LGTM. Built and tested.
>
> perf $ ./perf test "perf trace"
> 109: perf trace enum augmentation tests                              : Ok
> 110: perf trace exit race                                            : Ok
>
> Reviewed-by: Howard Chu <howardchu95@...il.com>
>
> Thanks,
> Howard