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

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Message-ID: <20201012112419.GJ1099489@krava>
Date:   Mon, 12 Oct 2020 13:24:19 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     John Garry <john.garry@...wei.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 Mon, Oct 12, 2020 at 12:15:04PM +0100, John Garry wrote:
> 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.

right, thanks

Acked-by: Jiri Olsa <jolsa@...hat.com>

jirka