linux-kernel - [PATCH v2 3/4] perf test: Don't fail if user rdpmc returns 0 when disabled

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Message-ID: <20251112195311.1673981-4-irogers@google.com>
Date: Wed, 12 Nov 2025 11:53:10 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Chun-Tse Shao <ctshao@...gle.com>, Thomas Falcon <thomas.falcon@...el.com>, 
	Yang Li <yang.lee@...ux.alibaba.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] perf test: Don't fail if user rdpmc returns 0 when disabled

In certain hypervisor set ups the value 0 may be returned but this is
only erroneous if the user rdpmc isn't disabled.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/mmap-basic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
index 3c89d3001887..3313c236104e 100644
--- a/tools/perf/tests/mmap-basic.c
+++ b/tools/perf/tests/mmap-basic.c
@@ -322,7 +322,7 @@ static int test_stat_user_read(u64 event, enum user_read_state enabled)
 		}
 
 		perf_evsel__read(evsel, 0, 0, &counts);
-		if (counts.val == 0) {
+		if (rdpmc_supported && counts.val == 0) {
 			pr_err("User space counter reading for PMU %s [Failed read]\n", pmu->name);
 			ret = TEST_FAIL;
 			goto cleanup;
-- 
2.51.2.1041.gc1ab5b90ca-goog