linux-kernel - [PATCH AUTOSEL for 4.4 018/115] perf probe: Return errno when not hitting any event

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Date:   Sat, 3 Mar 2018 22:30:58 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 018/115] perf probe: Return errno when not
 hitting any event

From: Kefeng Wang <wangkefeng.wang@...wei.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 = 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@...wei.com>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Hanjun Guo <guohanjun@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wang Nan <wangnan0@...wei.com>
Fixes: dddc7ee32fa1 ("perf probe: Fix an error when deleting probes successfully")
Link: http://lkml.kernel.org/r/1489738592-61011-1-git-send-email-wangkefeng.wang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.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 132afc97676c..9d4ac90ca87e 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -405,9 +405,9 @@ static int perf_del_probe_events(struct strfilter *filter)
 	}
 
 	if (ret == -ENOENT && ret2 == -ENOENT)
-		pr_debug("\"%s\" does not hit any event.\n", str);
-		/* Note that this is silently ignored */
-	ret = 0;
+		pr_warning("\"%s\" does not hit any event.\n", str);
+	else
+		ret = 0;
 
 error:
 	if (kfd >= 0)
-- 
2.14.1