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Date: Sun, 26 May 2013 16:52:01 +0800
From: Wang YanQing <udknight@...il.com>
To: rostedt@...dmis.org
Cc: fweisbec@...il.com, mingo@...hat.com, linux-kernel@...r.kernel.org,
vnagarnaik@...gle.com
Subject: [PATCH] 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.
Signed-off-by: Wang YanQing <udknight@...il.com>
---
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 ae6fa2d..02d9875 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5927,7 +5927,7 @@ 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,
--
1.7.12.4.dirty
--
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