perf evsel: Separate bpf_counter_list and bpf_filters, can be used at the same time

'struct evsel' uses a union for the two lists. This turned out to be
error prone.

For example:

  [root@quaco ~]# 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)
  [root@quaco ~]# perf stat --bpf-prog 5246

Fix this issue by separating the two lists.

Fixes: 56ec9457a4a20c5e ("perf bpf filter: Implement event sample filtering")
Signed-off-by: Song Liu <song@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kernel-team@meta.com
Link: https://lore.kernel.org/r/20230519235757.3613719-1-song@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 2f5910b..c2dbb56 100644 (file)
--- 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 df89287..0f54f28 100644 (file)
--- 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;