[PATCH] perf jevents: Fix event code for events referencing std arch events

[John Garry]

The event code for events referencing std arch events is incorrectly
evaluated in json_events().

The issue is that je.event is evaluated properly from try_fixup(), but
later NULLified from the real_event() call, as "event" may be NULL.

Fix by setting "event" same je.event in try_fixup().

Also remove support for overwriting event code for events using std arch
events, as it is not used.

Signed-off-by: John Garry <john.ga...@huawei.com>

diff --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;
                        return 0;
                }
        }
@@ -678,7 +673,7 @@ static int json_events(const char *fn,
                         * An arch standard event is referenced, so try to
                         * fixup any unassigned values.
                         */
-                       err = try_fixup(fn, arch_std, eventcode, &je);
+                       err = try_fixup(fn, arch_std, &je, &event);
                        if (err)
                                goto free_strings;
                }
-- 
2.26.2