linux-kernel - Re: [PATCH 1/7] tracing: Introduce trace_create_cpu_file() and tracing_get

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Message-ID: <1374505560.3356.94.camel@gandalf.local.home>
Date:	Mon, 22 Jul 2013 11:06:00 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Alexander Z Lam <azl@...gle.com>,
	David Sharp <dhsharp@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] tracing: Introduce trace_create_cpu_file() and
 tracing_get_cpu()

On Mon, 2013-07-22 at 10:55 -0400, Steven Rostedt wrote:

> The problem is that some files only references the tr for a certain CPU.
> Another data structure was created when the file was opened called
> trace_cpu (tc), which maps a CPU and a trace_array. As there is no

Correction, the trace_cpu is created when the file is created, not when
it was opened.

> global list of trace_cpus, this is susceptible to the above race
> condition. Accessing tc->tr can happen after tc has been freed.


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