From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>, Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@linux.intel.com>, Ian Rogers <irogers@google.com>,
Song Liu <songliubraving@fb.com>
Subject: [PATCH] perf stat: Fix error check for bpf_program__attach
Date: Thu, 27 May 2021 15:00:52 -0700 [thread overview]
Message-ID: <20210527220052.1657578-1-namhyung@kernel.org> (raw)
It seems the bpf_program__attach() returns a negative error code
instead of a NULL pointer in case of error.
Fixes: 7fac83aaf2ee ("perf stat: Introduce 'bperf' to share hardware PMCs with BPF")
Cc: Song Liu <songliubraving@fb.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/util/bpf_counter.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
index ddb52f748c8e..974f10e356f0 100644
--- a/tools/perf/util/bpf_counter.c
+++ b/tools/perf/util/bpf_counter.c
@@ -451,10 +451,10 @@ static int bperf_reload_leader_program(struct evsel *evsel, int attr_map_fd,
goto out;
}
- err = -1;
link = bpf_program__attach(skel->progs.on_switch);
- if (!link) {
+ if (IS_ERR(link)) {
pr_err("Failed to attach leader program\n");
+ err = PTR_ERR(link);
goto out;
}
--
2.32.0.rc0.204.g9fa02ecfa5-goog
next reply other threads:[~2021-05-27 22:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-27 22:00 Namhyung Kim [this message]
2021-05-28 0:51 ` Arnaldo Carvalho de Melo
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