linux-kernel - [PATCH 6.7 456/713] perf expr: Fix "has_event" function for metric style events

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Date: Sun, 24 Mar 2024 18:43:02 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Ian Rogers <irogers@...gle.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	James Clark <james.clark@....com>,
	Kaige Ye <ye@...ge.org>,
	John Garry <john.g.garry@...cle.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.7 456/713] perf expr: Fix "has_event" function for metric style events

From: Ian Rogers <irogers@...gle.com>

[ Upstream commit 6dd76680b925228312756c13b9b983661b552a64 ]

Events in metrics cannot use '/' as a separator, it would be
recognized as a divide, so they use '@'. The '@' is recognized in the
metricgroups code and changed to '/', do the same in the has_event
function so that the parsing is only tried without the @s.

Fixes: 4a4a9bf9075f ("perf expr: Add has_event function")
Signed-off-by: Ian Rogers <irogers@...gle.com>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
Cc: K Prateek Nayak <kprateek.nayak@....com>
Cc: James Clark <james.clark@....com>
Cc: Kaige Ye <ye@...ge.org>
Cc: John Garry <john.g.garry@...cle.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Link: https://lore.kernel.org/r/20240209204947.3873294-3-irogers@google.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/util/expr.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
index 7be23b3ac0821..b8875aac8f870 100644
--- a/tools/perf/util/expr.c
+++ b/tools/perf/util/expr.c
@@ -500,7 +500,25 @@ double expr__has_event(const struct expr_parse_ctx *ctx, bool compute_ids, const
 	tmp = evlist__new();
 	if (!tmp)
 		return NAN;
-	ret = parse_event(tmp, id) ? 0 : 1;
+
+	if (strchr(id, '@')) {
+		char *tmp_id, *p;
+
+		tmp_id = strdup(id);
+		if (!tmp_id) {
+			ret = NAN;
+			goto out;
+		}
+		p = strchr(tmp_id, '@');
+		*p = '/';
+		p = strrchr(tmp_id, '@');
+		*p = '/';
+		ret = parse_event(tmp, tmp_id) ? 0 : 1;
+		free(tmp_id);
+	} else {
+		ret = parse_event(tmp, id) ? 0 : 1;
+	}
+out:
 	evlist__delete(tmp);
 	return ret;
 }
-- 
2.43.0