linux-kernel - Re: [PATCH 0/7] tracing: Kill the buggy trace

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Date:	Mon, 22 Jul 2013 10:59:44 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	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 0/7] tracing: Kill the buggy trace_cpu

On Mon, 2013-07-22 at 15:43 +0200, Oleg Nesterov wrote:
> Hello.
> 
> Only slightly tested so far. I'll try to test more and report
> the results.
> 
> Meanwhile it would be nice if you can take a look and review.
> 
> 
> This series kills tracing_open_generic_tc/trace_cpu/etc.
> 
> trace_array_get(inode->i_private) is mostly fine, we do not
> dereference this pointer untill trace_array_get() succeeds.
> But trace_array_get(tc->tr) is wrong by the same reason why
> tracing_open_generic_file/etc are wrong, see 1/7.
> 
> And not only trace_cpu is buggy, we can simplify the code if
> we kill this member.
> 

Oleg,

So far I like the patch set. I just want to get Al's OK before we do a
hack with an inode structure item.

Thanks!

-- Steve


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