[PATCH 3/7] tracing: add back the available_events file

[Steven Rostedt <rostedt@goodmis.org>]

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From: Steven Rostedt <srostedt@redhat.com>

The event directory files type and available_types were no longer
needed with the new TRACE_EVENT_FORMAT macros, they were deleted.
But by accident the available_events file was also removed.
This patch brings it back.

Reported-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---
 kernel/trace/trace_events.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 85ec10f..769dfd0 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -428,6 +428,13 @@ static const struct seq_operations show_set_event_seq_ops = {
 	.stop = t_stop,
 };
 
+static const struct file_operations ftrace_avail_fops = {
+	.open = ftrace_event_seq_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = seq_release,
+};
+
 static const struct file_operations ftrace_set_event_fops = {
 	.open = ftrace_event_seq_open,
 	.read = seq_read,
@@ -569,6 +576,13 @@ static __init int event_trace_init(void)
 	if (!d_tracer)
 		return 0;
 
+	entry = debugfs_create_file("available_events", 0444, d_tracer,
+				    (void *)&show_event_seq_ops,
+				    &ftrace_avail_fops);
+	if (!entry)
+		pr_warning("Could not create debugfs "
+			   "'available_events' entry\n");
+
 	entry = debugfs_create_file("set_event", 0644, d_tracer,
 				    (void *)&show_set_event_seq_ops,
 				    &ftrace_set_event_fops);
-- 
1.6.1.3

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