linux-kernel - Re: [PATCH 2/2] perf stat: Fix invalid output handle

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Message-ID: <CAM9d7cj0Zrv32CgJ7jSjCY=CsOcF40zC2kxE+NSixG4qZDpXqQ@mail.gmail.com>
Date:   Wed, 30 Nov 2022 10:32:54 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     James Clark <james.clark@....com>
Cc:     linux-perf-users@...r.kernel.org, acme@...nel.org,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH 2/2] perf stat: Fix invalid output handle

On Wed, Nov 30, 2022 at 3:15 AM James Clark <james.clark@....com> wrote:
>
> In this context, 'os' is already a pointer so the extra dereference
> isn't required. This fixes the following test failure on aarch64:
>
>   $ ./perf test "json output" -vvv
>   92: perf stat JSON output linter                                    :
>   --- start ---
>   Checking json output: no args Test failed for input:
>   ...
>   Fatal error: glibc detected an invalid stdio handle
>   ---- end ----
>   perf stat JSON output linter: FAILED!
>
> Fixes: e7f4da312259 ("perf stat: Pass struct outstate to printout()")
> Signed-off-by: James Clark <james.clark@....com>

Thanks for fixing this.  I'm not sure how I missed it.. :(

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
>  tools/perf/util/stat-display.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index 847acdb5dc40..eac5ac3a734c 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -741,7 +741,7 @@ static void printout(struct perf_stat_config *config, struct outstate *os,
>                 perf_stat__print_shadow_stats(config, counter, uval, map_idx,
>                                               &out, &config->metric_events, &rt_stat);
>         } else {
> -               pm(config, &os, /*color=*/NULL, /*format=*/NULL, /*unit=*/"", /*val=*/0);
> +               pm(config, os, /*color=*/NULL, /*format=*/NULL, /*unit=*/"", /*val=*/0);
>         }
>
>         if (!config->metric_only) {
> --
> 2.25.1
>