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Message-ID: <0f9ef383-0d1c-1b19-83e5-5f946f1b301d@linux.ibm.com>
Date: Mon, 24 Aug 2020 16:44:35 +0200
From: Thomas Richter <tmricht@...ux.ibm.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Jin Yao <yao.jin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
svens@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com,
heiko.carstens@...ibm.com
Subject: Re: [PATCH] Fix s390x compile error on F32 utils/stat-display.c
Hi Arnaldo, Jin, Jiri
any update on this issue?
Thanks.
On 8/12/20 1:27 PM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Jul 22, 2020 at 11:20:53AM +0200, Thomas Richter escreveu:
>> Fix a compile error on F32 and gcc version 10.1 on s390 in file
>> utils/stat-display.c. The error does not show up with make DEBUG=y.
>> In fact the issue shows up when using both compiler options
>> -O6 and -D_FORTIFY_SOURCE=2 (which are omitted with DEBUG=Y).
>>
>> This is the offending call chain:
>> print_counter_aggr()
>> printout(config, -1, 0, ...) with 2nd parm id set to -1
>> aggr_printout(config, x, id --> -1, ...) which leads to this code:
>> case AGGR_NONE:
>> if (evsel->percore && !config->percore_show_thread) {
>> ....
>> } else {
>> fprintf(config->output, "CPU%*d%s",
>> config->csv_output ? 0 : -7,
>> evsel__cpus(evsel)->map[id],
>> ^^ id is -1 !!!!
>> config->csv_sep);
>> }
>>
>> This is a compiler inlining issue which is detected on s390 but not on
>> other plattforms.
>
> What is the sequence of events that gets to this? I.e. is it valid to
> get a config->aggr_mode == AGGR_NONE, then have evsel not be percore and
> config->percore_show_thread to be false?
>
> I wonder if this won't be papering over some bug :-\
>
> Jin?
>
> This is where this came from:
> commit 4fc4d8dfa056dfd48afe73b9ea3b7570ceb80b9c (tag: perf-core-for-mingo-5.2-20190517)
> Author: Jin Yao <yao.jin@...ux.intel.com>
> Date: Fri Apr 12 21:59:49 2019 +0800
>
> perf stat: Support 'percore' event qualifier
>
> With this patch, we can use the 'percore' event qualifier in perf-stat.
>
> ---
>
> Also please add at least Jiri and Namhyung on the CC list, having the
> person that added that array usage also helps.
>
> [acme@...co perf]$ scripts/get_maintainer.pl tools/perf | grep reviewer
> Mark Rutland <mark.rutland@....com> (reviewer:PERFORMANCE EVENTS SUBSYSTEM)
> Alexander Shishkin <alexander.shishkin@...ux.intel.com> (reviewer:PERFORMANCE EVENTS SUBSYSTEM)
> Jiri Olsa <jolsa@...hat.com> (reviewer:PERFORMANCE EVENTS SUBSYSTEM)
> Namhyung Kim <namhyung@...nel.org> (reviewer:PERFORMANCE EVENTS SUBSYSTEM)
> [acme@...co perf]$
>
> Thanks,
>
> - Arnaldo
>
>> Output before:
>> # make util/stat-display.o
>> .....
>>
>> util/stat-display.c: In function ‘perf_evlist__print_counters’:
>> util/stat-display.c:121:4: error: array subscript -1 is below array
>> bounds of ‘int[]’ [-Werror=array-bounds]
>> 121 | fprintf(config->output, "CPU%*d%s",
>> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> 122 | config->csv_output ? 0 : -7,
>> | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> 123 | evsel__cpus(evsel)->map[id],
>> | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> 124 | config->csv_sep);
>> | ~~~~~~~~~~~~~~~~
>> In file included from util/evsel.h:13,
>> from util/evlist.h:13,
>> from util/stat-display.c:9:
>> /root/linux/tools/lib/perf/include/internal/cpumap.h:10:7:
>> note: while referencing ‘map’
>> 10 | int map[];
>> | ^~~
>> cc1: all warnings being treated as errors
>> mv: cannot stat 'util/.stat-display.o.tmp': No such file or directory
>> make[3]: *** [/root/linux/tools/build/Makefile.build:97: util/stat-display.o]
>> Error 1
>> make[2]: *** [Makefile.perf:716: util/stat-display.o] Error 2
>> make[1]: *** [Makefile.perf:231: sub-make] Error 2
>> make: *** [Makefile:110: util/stat-display.o] Error 2
>> [root@...lp46 perf]#
>>
>> Output after:
>> # make util/stat-display.o
>> .....
>> CC util/stat-display.o
>> [root@...lp46 perf]#
>>
>> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
>> ---
>> tools/perf/util/stat-display.c | 9 +++++----
>> 1 file changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
>> index 57d0706e1330..e49e544188e4 100644
>> --- a/tools/perf/util/stat-display.c
>> +++ b/tools/perf/util/stat-display.c
>> @@ -118,10 +118,11 @@ static void aggr_printout(struct perf_stat_config *config,
>> config->csv_output ? 0 : -3,
>> cpu_map__id_to_cpu(id), config->csv_sep);
>> } else {
>> - fprintf(config->output, "CPU%*d%s",
>> - config->csv_output ? 0 : -7,
>> - evsel__cpus(evsel)->map[id],
>> - config->csv_sep);
>> + if (id > -1)
>> + fprintf(config->output, "CPU%*d%s",
>> + config->csv_output ? 0 : -7,
>> + evsel__cpus(evsel)->map[id],
>> + config->csv_sep);
>> }
>> break;
>> case AGGR_THREAD:
>> --
>> 2.26.2
>>
>
--
Thomas Richter, Dept 3252, IBM s390 Linux Development, Boeblingen, Germany
--
Vorsitzender des Aufsichtsrats: Gregor Pillen
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294
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