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authorYang Jihong <yangjihong1@huawei.com>2022-12-20 11:57:00 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2022-12-20 15:16:33 -0300
commit188ac720d364035008a54d249cf47b4cc100f819 (patch)
treef61b464bcc9fb48dbbb610e9ff50951c23dad0a4 /kernel/kheaders.c
parentb235e5b51f7d557cf10cbb1245b6cdeb341e1e2b (diff)
downloadlinux-188ac720d364035008a54d249cf47b4cc100f819.tar.bz2
perf debug: Set debug_peo_args and redirect_to_stderr variable to correct values in perf_quiet_option()
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>
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