linux-kernel - [PATCH] perf evsel: Fix missing inherit + sample read check

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Message-ID: <20241009062250.730192-1-namhyung@kernel.org>
Date: Tue,  8 Oct 2024 23:22:50 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org,
	Ben Gainey <ben.gainey@....com>
Subject: [PATCH] perf evsel: Fix missing inherit + sample read check

It should not clear the inherit bit simply because the kernel doesn't
support the sample read with it.  IOW the inherit bit should be kept
when the sample read is not requested for the event.

Fixes: 90035d3cd876cb71 ("tools/perf: Allow inherit + PERF_SAMPLE_READ when opening events")
Cc: Ben Gainey <ben.gainey@....com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/evsel.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index d8fd493af01458b7..507f526ccbbcfc36 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2112,7 +2112,8 @@ static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
 
 static void evsel__disable_missing_features(struct evsel *evsel)
 {
-	if (perf_missing_features.inherit_sample_read)
+	if (perf_missing_features.inherit_sample_read && evsel->core.attr.inherit &&
+	    (evsel->core.attr.sample_type & PERF_SAMPLE_READ))
 		evsel->core.attr.inherit = 0;
 	if (perf_missing_features.branch_counters)
 		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_COUNTERS;
-- 
2.47.0.rc0.187.ge670bccf7e-goog