linux-kernel - Re: [PATCH] perf jevents: Fix sys_event_tables to be freed like arch_std

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Date:   Tue, 28 Sep 2021 13:49:20 +0100
From:   John Garry <john.garry@...wei.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Like Xu <like.xu.linux@...il.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        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] perf jevents: Fix sys_event_tables to be freed like
 arch_std_events

On 28/09/2021 12:52, Arnaldo Carvalho de Melo wrote:
> Em Tue, Sep 28, 2021 at 06:29:38PM +0800, Like Xu escreveu:
>> From: Like Xu <likexu@...cent.com>
>>
>> The compiler reports that free_sys_event_tables() is dead code. But
>> according to the semantics, the "LIST_HEAD(arch_std_events)" should
>> also be released, just like we do with 'arch_std_events' in the main().
> 
> Thanks, applied.
> 
> - Arnaldo
> 

If not too late:
Reviewed-by: John Garry <john.garry@...wei.com>

I think that it could be a good idea to raise gcc warning level to 
detect unused static functions, like this was

thanks

>   
>> Fixes: e9d32c1bf0cd7a98 ("perf vendor events: Add support for arch standard events")
>> Signed-off-by: Like Xu <likexu@...cent.com>
>> ---
>>   tools/perf/pmu-events/jevents.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
>> index 6731b3cf0c2f..7c887d37b893 100644
>> --- a/tools/perf/pmu-events/jevents.c
>> +++ b/tools/perf/pmu-events/jevents.c
>> @@ -1285,6 +1285,7 @@ int main(int argc, char *argv[])
>>   	}
>>   
>>   	free_arch_std_events();
>> +	free_sys_event_tables();
>>   	free(mapfile);
>>   	return 0;
>>   
>> @@ -1306,6 +1307,7 @@ int main(int argc, char *argv[])
>>   		create_empty_mapping(output_file);
>>   err_out:
>>   	free_arch_std_events();
>> +	free_sys_event_tables();
>>   	free(mapfile);
>>   	return ret;
>>   }
>> -- 
>> 2.32.0
>