From: Masami Hiramatsu mhiramat@kernel.org
[ Upstream commit c6aab66a728b6518772c74bd9dff66e1a1c652fd ]
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") Reported-by: Yuxuan Shui yshuiv7@gmail.com Signed-off-by: Masami Hiramatsu mhiramat@kernel.org Tested-by: Yuxuan Shui yshuiv7@gmail.com Cc: Jiri Olsa jolsa@redhat.com Cc: Namhyung Kim namhyung@kernel.org Cc: stable@vger.kernel.org Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207587 Link: http://lore.kernel.org/lkml/158877535215.26469.1113127926699134067.stgit@dev... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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;