[PATCH 1/3] perf stat: Fix BPF program section name

[Namhyung Kim <namhyung@xxxxxxxxxx>]

It seems the recent libbpf got more strict about the section name.
I'm seeing a failure like this:

  $ sudo ./perf stat -a --bpf-counters --for-each-cgroup ^. sleep 1
  libbpf: prog 'on_cgrp_switch': missing BPF prog type, check ELF section name 'perf_events'
  libbpf: prog 'on_cgrp_switch': failed to load: -22
  libbpf: failed to load object 'bperf_cgroup_bpf'
  libbpf: failed to load BPF skeleton 'bperf_cgroup_bpf': -22
  Failed to load cgroup skeleton

The section name should be 'perf_event' (without the trailing 's').
Although it's related to the libbpf change, it'd be better fix the
section name in the first place.

Fixes: 944138f048f7 ("perf stat: Enable BPF counter with --for-each-cgroup")
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/util/bpf_skel/bperf_cgroup.bpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/bpf_skel/bperf_cgroup.bpf.c b/tools/perf/util/bpf_skel/bperf_cgroup.bpf.c
index 292c430768b5..c72f8ad96f75 100644
--- a/tools/perf/util/bpf_skel/bperf_cgroup.bpf.c
+++ b/tools/perf/util/bpf_skel/bperf_cgroup.bpf.c
@@ -176,7 +176,7 @@ static int bperf_cgroup_count(void)
 }
 
 // This will be attached to cgroup-switches event for each cpu
-SEC("perf_events")
+SEC("perf_event")
 int BPF_PROG(on_cgrp_switch)
 {
 	return bperf_cgroup_count();
-- 
2.37.2.789.g6183377224-goog