linux-kernel - Re: [PATCH] perf jevents: Fix event code for events referencing std arch events

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Date:   Mon, 12 Oct 2020 12:15:04 +0100
From:   John Garry <john.garry@...wei.com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <namhyung@...nel.org>, <kjain@...ux.ibm.com>, <irogers@...gle.com>,
        <yao.jin@...ux.intel.com>, <yeyunfeng@...wei.com>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <=linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] perf jevents: Fix event code for events referencing std
 arch events

On 12/10/2020 11:54, Jiri Olsa wrote:
>> ff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
>> index 99df41a9543d..e47644cab3fa 100644
>> --- a/tools/perf/pmu-events/jevents.c
>> +++ b/tools/perf/pmu-events/jevents.c
>> @@ -505,20 +505,15 @@ static char *real_event(const char *name, char *event)
>>   }
>>   
>>   static int
>> -try_fixup(const char *fn, char *arch_std, unsigned long long eventcode,
>> -	  struct json_event *je)
>> +try_fixup(const char *fn, char *arch_std, struct json_event *je, char **event)
>>   {
>>   	/* try to find matching event from arch standard values */
>>   	struct event_struct *es;
>>   
>>   	list_for_each_entry(es, &arch_std_events, list) {
>>   		if (!strcmp(arch_std, es->name)) {
>> -			if (!eventcode && es->event) {
>> -				/* allow EventCode to be overridden */
>> -				free(je->event);
>> -				je->event = NULL;
>> -			}
>>   			FOR_ALL_EVENT_STRUCT_FIELDS(TRY_FIXUP_FIELD);
>> +			*event = je->event;
> I'm bit rusty on this code, 
> but isn't je->event NULL at this point?

je->event should be now assigned from es->event because of 
FOR_ALL_EVENT_STRUCT_FIELDS(TRY_FIXUP_FIELD):

#define TRY_FIXUP_FIELD(field) do { if (es->field && !*field) {\
	*field = strdup(es->field);				\
	if (!*field)						\
		return -ENOMEM;					\
} } while (0)

And es->event should be set.

Thanks,
John