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

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Date:   Thu, 8 Oct 2020 23:19:28 +0800
From:   John Garry <john.garry@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...hat.com>, <namhyung@...nel.org>, <kjain@...ux.ibm.com>,
        <irogers@...gle.com>, <yao.jin@...ux.intel.com>,
        <yeyunfeng@...wei.com>
CC:     <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <=linux-arm-kernel@...ts.infradead.org>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH] perf jevents: Fix event code for events referencing std arch events

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.garry@...wei.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