tracing: Fix file mode of free_buffer
Commit 4f271a2a60c748599b30bb4dafff30d770439b96
(tracing: Add a proc file to stop tracing and free buffer)
implement a method to free up ring buffer in kernel memory
in the release code path of free_buffer's fd.
Then we don't need read/write support for free_buffer,
indeed we just have a dummy write fop, and don't implement read fop.
So the 0200 is more reasonable file mode for free_buffer than
the current file mode 0644.
Link: http://lkml.kernel.org/r/20130526085201.GA3183@udknight
Acked-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Acked-by: David Sharp <dhsharp@google.com>
Signed-off-by: Wang YanQing <udknight@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1a41023..5f4a09c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5935,7 +5935,7 @@
trace_create_file("buffer_total_size_kb", 0444, d_tracer,
tr, &tracing_total_entries_fops);
- trace_create_file("free_buffer", 0644, d_tracer,
+ trace_create_file("free_buffer", 0200, d_tracer,
tr, &tracing_free_buffer_fops);
trace_create_file("trace_marker", 0220, d_tracer,