From: Wang YanQing 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 Acked-by: David Sharp Signed-off-by: Wang YanQing Signed-off-by: Steven Rostedt --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer) 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, -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/