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

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Date:	Mon, 22 Jul 2013 15:43:13 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	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: [PATCH 0/7] tracing: Kill the buggy trace_cpu

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.

 kernel/trace/trace.c |  192 ++++++++++++++++++++------------------------------
 kernel/trace/trace.h |    8 --
 2 files changed, 76 insertions(+), 124 deletions(-)

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