From: Ian Rogers <irogers@google.com>
Date: Wed, 3 Dec 2025 21:47:00 +0000 (-0800)
Subject: perf stat: Allow no events to open if this is a "--null" run
X-Git-Tag: v6.18.2~84
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=850f134a4c81954f95f0eafe49e80fece82b11ba;p=thirdparty%2Fkernel%2Fstable.git

perf stat: Allow no events to open if this is a "--null" run

[ Upstream commit 6744c0b182c1f371135bc3f4e62b96ad884c9f89 ]

It is intended that a "--null" run doesn't open any events.

Fixes: 2cc7aa995ce9 ("perf stat: Refactor retry/skip/fatal error handling")
Tested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index f1c9d6c94fc50..b6533dcf5465b 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -856,7 +856,7 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 			goto err_out;
 		}
 	}
-	if (!has_supported_counters) {
+	if (!has_supported_counters && !stat_config.null_run) {
 		evsel__open_strerror(evlist__first(evsel_list), &target, open_err,
 				     msg, sizeof(msg));
 		ui__error("No supported events found.\n%s\n", msg);