linux-kernel - Re: [PATCH] libperf test: Silence printf flag warning

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Date:   Tue, 4 May 2021 20:53:33 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libperf test: Silence printf flag warning

On Tue, May 4, 2021 at 2:43 PM Ian Rogers <irogers@...gle.com> wrote:
>
> __u64 maybe an unsigned long, it may also differ from the format
> expected by PRIu64. Add a cast to silence the warning:
>
> tools/lib/perf/tests/test-evsel.c:176:33: error: format specifies type 'unsigned long long' but the argument has type 'unsigned long' [-Werror,-Wformat]
>                 __T_VERBOSE("count = %llu\n", end - start);
>                                      ~~~~     ^~~~~~~~~~~
>                                      %lu

Which arch/compiler did you hit this? LLVM? Would have been 64-bit
presumably. I'm wondering how I didn't...

> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/lib/perf/tests/test-evsel.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/lib/perf/tests/test-evsel.c b/tools/lib/perf/tests/test-evsel.c
> index 288b5feaefe2..558097bbbfd0 100644
> --- a/tools/lib/perf/tests/test-evsel.c
> +++ b/tools/lib/perf/tests/test-evsel.c
> @@ -173,7 +173,7 @@ static int test_stat_user_read(int event)
>
>                 __T("invalid counter data", (end - start) > last);
>                 last = end - start;
> -               __T_VERBOSE("count = %llu\n", end - start);
> +               __T_VERBOSE("count = %llu\n", (unsigned long long)(end - start));

I think I'd either change end/start to uint64_t which matches the
count struct and use PRIu64, or change them to unsigned long long.

>         }
>
>         perf_evsel__munmap(evsel);
> --
> 2.31.1.607.g51e8a6a459-goog
>