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Date:   Wed,  6 May 2020 23:29:12 +0900
From:   Masami Hiramatsu <>
To:     Arnaldo Carvalho de Melo <>
Cc:     Jiri Olsa <>, Namhyung Kim <>,
        Masami Hiramatsu <>,
Subject: [PATCH] perf-probe: Accept the instance number of kretprobe event

Since the commit 6a13a0d7b4d1 ("ftrace/kprobe: Show the
maxactive number on kprobe_events") introduced to show the
instance number of kretprobe events, the length of the 1st
format of the kprobe event will not 1, but it can be longer.
This caused a parser error in perf-probe.

Skip the length check the 1st format of the kprobe event
to accept this instance number.

Without this fix:

  # perf probe -a vfs_read%return
  Added new event:
    probe:vfs_read__return (on vfs_read%return)

  You can now use it in all perf tools, such as:

  	perf record -e probe:vfs_read__return -aR sleep 1

  # perf probe -l
  Semantic error :Failed to parse event name: r16:probe/vfs_read__return
    Error: Failed to show event list.

And with this fixes:

  # perf probe -a vfs_read%return
  # perf probe -l
    probe:vfs_read__return (on vfs_read%return)

Fixes: 6a13a0d7b4d1 ("ftrace/kprobe: Show the maxactive number on kprobe_events")
Signed-off-by: Masami Hiramatsu <>
 tools/perf/util/probe-event.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index eea132f512b0..c6bcf5709564 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1765,8 +1765,7 @@ int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
 	fmt1_str = strtok_r(argv0_str, ":", &fmt);
 	fmt2_str = strtok_r(NULL, "/", &fmt);
 	fmt3_str = strtok_r(NULL, " \t", &fmt);
-	if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
-	    || fmt3_str == NULL) {
+	if (fmt1_str == NULL || fmt2_str == NULL || fmt3_str == NULL) {
 		semantic_error("Failed to parse event name: %s\n", argv[0]);
 		ret = -EINVAL;
 		goto out;

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