linux-kernel - [PATCH v2] perf probe: Fix to delete multiple probe event

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Date:   Fri, 28 Feb 2020 16:57:42 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        He Zhe <zhe.he@...driver.com>, stable@...r.kernel.org
Subject: [PATCH v2] perf probe: Fix to delete multiple probe event

Fix to delete multiple probe event with filter correctly.

When we put an event with multiple probes, perf-probe fails
to delete with filters. This comes from a failure to list
up the event name because of overwrapping its name.

To fix this issue, skip to list up the event which has
same name.

Without this patch:
  # perf probe -l \*
    probe_perf:map__map_ip (on perf_sample__fprintf_brstackoff:21@
    probe_perf:map__map_ip (on perf_sample__fprintf_brstackoff:25@
    probe_perf:map__map_ip (on append_inlines:12@...l/machine.c in
    probe_perf:map__map_ip (on unwind_entry:19@...l/machine.c in /
    probe_perf:map__map_ip (on map__map_ip@...l/map.h in /home/mhi
    probe_perf:map__map_ip (on map__map_ip@...l/map.h in /home/mhi
  # perf probe -d \*
  "*" does not hit any event.
    Error: Failed to delete events. Reason: No such file or directory (Code: -2)

With this:
  # perf probe -d \*
  Removed event: probe_perf:map__map_ip

Fixes: 72363540c009 ("perf probe: Support multiprobe event")
Reported-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Reported-by: He Zhe <zhe.he@...driver.com>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 v2:
  - Forward port on the latest perf/urgent tree.
  - Add Fixes and Reporters.
---
 tools/perf/util/probe-file.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 0f5fda11675f..8c852948513e 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -206,6 +206,9 @@ static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
 		} else
 			ret = strlist__add(sl, tev.event);
 		clear_probe_trace_event(&tev);
+		/* Skip if there is same name multi-probe event in the list */
+		if (ret == -EEXIST)
+			ret = 0;
 		if (ret < 0)
 			break;
 	}