[PATCH] perf: Don't list tracepoints without an id

[Peter Zijlstra <peterz@infradead.org>]

Stop perf list from displaying tracepoints without an id file.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 tools/perf/util/parse-events.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 7bdad8d..d00636b 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -568,6 +568,7 @@ static void print_tracepoint_events(void)
 	struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 	struct stat st;
 	char evt_path[MAXPATHLEN];
+	int fd;
 
 	if (valid_debugfs_mount(debugfs_path))
 		return;
@@ -582,6 +583,15 @@ static void print_tracepoint_events(void)
 			goto cleanup;
 		for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
 								evt_path, st) {
+
+			snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id",
+					debugfs_path, 
+					sys_dirent.d_name, evt_dirent.d_name);
+			fd = open(evt_path, O_RDONLY);
+			if (fd < 0)
+				continue;
+			close(fd);
+
 			snprintf(evt_path, MAXPATHLEN, "%s:%s",
 				 sys_dirent.d_name, evt_dirent.d_name);
 			fprintf(stderr, "  %-40s [%s]\n", evt_path,