This is a note to let you know that I've just added the patch titled
perf bpf-filter: Fix sample flag check with ||
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-bpf-filter-fix-sample-flag-check-with.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6895edb3735a24c36f1be5cbfb4be0e4d161ec6c
Author: Namhyung Kim <namhyung@xxxxxxxxxx>
Date: Thu Aug 10 19:58:21 2023 -0700
perf bpf-filter: Fix sample flag check with ||
[ Upstream commit dc7f01f1bceca38839992b3371e0be8a3c9d5acf ]
For logical OR operator, the actual sample_flags are in the 'groups'
list so it needs to check entries in the list instead. Otherwise it
would show the following error message.
$ sudo perf record -a -e cycles:p --filter 'period > 100 || weight > 0' sleep 1
Error: cycles:p event does not have sample flags 0
failed to set filter "BPF" on event cycles:p with 2 (No such file or directory)
Actually it should warn on 'weight' is used without WEIGHT flag.
Error: cycles:p event does not have PERF_SAMPLE_WEIGHT
Hint: please add -W option to perf record
failed to set filter "BPF" on event cycles:p with 2 (No such file or directory)
Fixes: 4310551b76e0d676 ("perf bpf filter: Show warning for missing sample flags")
Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230811025822.3859771-1-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/perf/util/bpf-filter.c b/tools/perf/util/bpf-filter.c
index 0b30688d78a7f..a1f076ef653d3 100644
--- a/tools/perf/util/bpf-filter.c
+++ b/tools/perf/util/bpf-filter.c
@@ -62,6 +62,16 @@ static int check_sample_flags(struct evsel *evsel, struct perf_bpf_filter_expr *
if (evsel->core.attr.sample_type & expr->sample_flags)
return 0;
+ if (expr->op == PBF_OP_GROUP_BEGIN) {
+ struct perf_bpf_filter_expr *group;
+
+ list_for_each_entry(group, &expr->groups, list) {
+ if (check_sample_flags(evsel, group) < 0)
+ return -1;
+ }
+ return 0;
+ }
+
info = get_sample_info(expr->sample_flags);
if (info == NULL) {
pr_err("Error: %s event does not have sample flags %lx\n",
