From: Yang Jihong yangjihong1@huawei.com
[ Upstream commit 188ac720d364035008a54d249cf47b4cc100f819 ]
When perf uses quiet mode, perf_quiet_option() sets the 'debug_peo_args' variable 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: f78eaef0e0493f60 ("perf tools: Allow to force redirect pr_debug to stderr.") Fixes: ccd26741f5e6bdf2 ("perf tool: Provide an option to print perf_event_open args and return value") Suggested-by: Adrian Hunter adrian.hunter@intel.com Reviewed-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Yang Jihong yangjihong1@huawei.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Andi Kleen ak@linux.intel.com Cc: Carsten Haitzler carsten.haitzler@arm.com Cc: Ian Rogers irogers@google.com Cc: Ingo Molnar mingo@redhat.com Cc: Jiri Olsa jolsa@kernel.org Cc: Leo Yan leo.yan@linaro.org Cc: Mark Rutland mark.rutland@arm.com Cc: martin.lau@kernel.org Cc: Masami Hiramatsu mhiramat@kernel.org Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Ravi Bangoria ravi.bangoria@amd.com Cc: Ravi Bangoria ravi.bangoria@linux.ibm.com Link: https://lore.kernel.org/r/20221220035702.188413-2-yangjihong1@huawei.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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; }