linux-kernel - [PATCH] perf: separate bpf_counter_list and bpf

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Message-ID: <20230519235757.3613719-1-song@kernel.org>
Date:   Fri, 19 May 2023 16:57:57 -0700
From:   Song Liu <song@...nel.org>
To:     <linux-kernel@...r.kernel.org>
CC:     <acme@...hat.com>, <jolsa@...nel.org>, <kernel-team@...a.com>,
        Song Liu <song@...nel.org>, Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH] perf: separate bpf_counter_list and bpf_filters

evsel uses a union for the two lists. This turned out to be error prone.
For example:

[root@...co ~]# perf stat --bpf-prog 5246
Error: cpu-clock event does not have sample flags 66c660
failed to set filter "(null)" on event cpu-clock with 2 (No such file or
directory)

Fix this issue by separating the two lists.

Fixes: 56ec9457a4a2 ("perf bpf filter: Implement event sample filtering")
Signed-off-by: Song Liu <song@...nel.org>
Acked-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/evsel.c | 1 +
 tools/perf/util/evsel.h | 6 ++----
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 2f5910b31fa9..c2dbb5647e75 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -282,6 +282,7 @@ void evsel__init(struct evsel *evsel,
 	evsel->bpf_fd	   = -1;
 	INIT_LIST_HEAD(&evsel->config_terms);
 	INIT_LIST_HEAD(&evsel->bpf_counter_list);
+	INIT_LIST_HEAD(&evsel->bpf_filters);
 	perf_evsel__object.init(evsel);
 	evsel->sample_size = __evsel__sample_size(attr->sample_type);
 	evsel__calc_id_pos(evsel);
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index df8928745fc6..0f54f28a69c2 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -151,10 +151,8 @@ struct evsel {
 	 */
 	struct bpf_counter_ops	*bpf_counter_ops;
 
-	union {
-		struct list_head	bpf_counter_list; /* for perf-stat -b */
-		struct list_head	bpf_filters; /* for perf-record --filter */
-	};
+	struct list_head	bpf_counter_list; /* for perf-stat -b */
+	struct list_head	bpf_filters; /* for perf-record --filter */
 
 	/* for perf-stat --use-bpf */
 	int			bperf_leader_prog_fd;
-- 
2.34.1