linux-kernel - [PATCH 1/3] perf tools: Set debug_peo_args and redirect_to_stderr to correct values in perf_quiet

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Date:   Tue, 20 Dec 2022 11:57:00 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <carsten.haitzler@....com>, <leo.yan@...aro.org>,
        <ravi.bangoria@....com>, <martin.lau@...nel.org>,
        <adrian.hunter@...el.com>, <ak@...ux.intel.com>,
        <masami.hiramatsu.pt@...achi.com>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [PATCH 1/3] perf tools: Set debug_peo_args and redirect_to_stderr to correct values in perf_quiet_option

When perf uses quiet mode, perf_quiet_option sets debug_peo_args to -1,
and display_attr incorrectly determines the value of debug_peo_args.
As a result, unexpected information is displayed.

Before:
  # perf record --quiet -- ls > /dev/null
  ------------------------------------------------------------
  perf_event_attr:
    size                             128
    { sample_period, sample_freq }   4000
    sample_type                      IP|TID|TIME|PERIOD
    read_format                      ID|LOST
    disabled                         1
    inherit                          1
    mmap                             1
    comm                             1
    freq                             1
    enable_on_exec                   1
    task                             1
    precise_ip                       3
    sample_id_all                    1
    exclude_guest                    1
    mmap2                            1
    comm_exec                        1
    ksymbol                          1
    bpf_event                        1
  ------------------------------------------------------------
  ...

After:
  # perf record --quiet -- ls > /dev/null
  #

redirect_to_stderr is a similar problem.

Fixes: f78eaef0e049 ("perf tools: Allow to force redirect pr_debug to stderr.")
Fixes: ccd26741f5e6 ("perf tool: Provide an option to print perf_event_open args and return value")
Suggested-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/perf/util/debug.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 65e6c22f38e4..190e818a0717 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -241,6 +241,10 @@ int perf_quiet_option(void)
 		opt++;
 	}
 
+	/* For debug variables that are used as bool types, set to 0. */
+	redirect_to_stderr = 0;
+	debug_peo_args = 0;
+
 	return 0;
 }
 
-- 
2.30.GIT