linux-kernel - Re: [PATCH] tracing: Fix file mode of free

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Message-ID: <CAJL_ektFUuXQresgiNoGuDvvGvnF5G8i1wMNG3z8q8aTD4nTUA@mail.gmail.com>
Date:	Tue, 28 May 2013 13:14:19 -0700
From:	David Sharp <dhsharp@...gle.com>
To:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Cc:	Wang YanQing <udknight@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing: Fix file mode of free_buffer

On Tue, May 28, 2013 at 12:34 PM, Vaibhav Nagarnaik
<vnagarnaik@...gle.com> wrote:
> On Sun, May 26, 2013 at 1:52 AM, Wang YanQing <udknight@...il.com> wrote:
>> 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>
>
> Acked-by: Vaibhav Nagarnaik <vnagarnaik@...gle.com>

Acked-by: David Sharp <dhsharp@...gle.com>

>
> Vaibhav Nagarnaik
>
>
>> ---
>>  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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