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perf utils: Silence "Couldn't synthesize bpf events" warning for EPERM 

Synthesizing BPF events is only supported for root. Silent warning msg
when non-root user runs perf-record.

Reported-by: David Carrillo-Cisneros <davidca@fb.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Tested-by: David Carrillo-Cisneros <davidca@fb.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: kernel-team@fb.com
Link: http://lkml.kernel.org/r/20190204193140.719740-1-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.1
Song Liu 2019-02-04 11:31:40 -08:00 committed by Arnaldo Carvalho de Melo
parent 33937e5994
commit 39f4a913d6
1 changed files with 2 additions and 2 deletions
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4
tools/perf/util/bpf-event.c
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@ -236,8 +236,8 @@ int perf_event__synthesize_bpf_events(struct perf_tool *tool,
pr_debug("%s: can't get next program: %s%s",
__func__, strerror(errno),
errno == EINVAL ? " -- kernel too old?" : "");
/* don't report error on old kernel */
err = (errno == EINVAL) ? 0 : -1;
/* don't report error on old kernel or EPERM */
err = (errno == EINVAL || errno == EPERM) ? 0 : -1;
break;
}
fd = bpf_prog_get_fd_by_id(id);