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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Kefeng Wang <wangkefeng.wang@huawei.com>,
        Hanjun Guo <guohanjun@huawei.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Wang Nan <wangnan0@huawei.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 044/219] perf probe: Return errno when not
 hitting any event
Thread-Topic: [PATCH AUTOSEL for 4.9 044/219] perf probe: Return errno when
 not hitting any event
Thread-Index: AQHTsz7vzj+BKoW7nUSlFmD21/rWUw==
Date:   Sat, 3 Mar 2018 22:28:21 +0000
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From: Kefeng Wang <wangkefeng.wang@huawei.com>

[ Upstream commit 70946723eeb859466f026274b29c6196e39149c4 ]

On old perf, when using 'perf probe -d' to delete an inexistent event,
it returns errno, eg,

  -bash-4.3# perf probe -d xxx  || echo $?
  Info: Event "*:xxx" does not exist.
    Error: Failed to delete events.
  255

But now perf_del_probe_events() will always set ret =3D 0, different from
previous del_perf_probe_events(). After this, it returns errno again,
eg,

  -bash-4.3# ./perf probe -d xxx  || echo $?
  "xxx" does not hit any event.
    Error: Failed to delete events.
  254

And it is more appropriate to return -ENOENT instead of -EPERM.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: dddc7ee32fa1 ("perf probe: Fix an error when deleting probes success=
fully")
Link: http://lkml.kernel.org/r/1489738592-61011-1-git-send-email-wangkefeng=
.wang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 tools/perf/builtin-probe.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index f87996b0cb29..9a250c71840e 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -442,9 +442,9 @@ static int perf_del_probe_events(struct strfilter *filt=
er)
 	}
=20
 	if (ret =3D=3D -ENOENT && ret2 =3D=3D -ENOENT)
-		pr_debug("\"%s\" does not hit any event.\n", str);
-		/* Note that this is silently ignored */
-	ret =3D 0;
+		pr_warning("\"%s\" does not hit any event.\n", str);
+	else
+		ret =3D 0;
=20
 error:
 	if (kfd >=3D 0)
--=20
2.14.1