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

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Date:   Wed, 14 Oct 2020 13:49:05 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     John Garry <john.garry@...wei.com>, peterz@...radead.org,
        mingo@...hat.com, 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

Em Mon, Oct 12, 2020 at 01:24:19PM +0200, Jiri Olsa escreveu:
> 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>

Ok, applied, please consider adding a Fixes tag next time.

- Arnaldo