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Date: Sat, 3 Mar 2018 22:28:21 +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 4.9 044/219] 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 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 *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
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