linux-kernel - Re: [PATCH 0/4] ftrace: One more check on x86 and some small fixes

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Message-ID: <20160628151756.5ff5b24f@gandalf.local.home>
Date:	Tue, 28 Jun 2016 15:17:56 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Petr Mladek <pmladek@...e.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH 0/4] ftrace: One more check on x86 and some small fixes

On Mon, 27 Jun 2016 15:54:33 +0200
Petr Mladek <pmladek@...e.com> wrote:

> 1st patch adds one more paranoid check of the modified function on x86.
> 
> Plus there are 3 small changes that appeared when hunting down
> the 1st patch.
> 
> Petr Mladek (4):
>   ftrace/x86: Make sure to modify 5-bite instructions
>   ftrace/x86: Do not crash when reading wrong ftrace func

The first two are mostly just "detect error, when it happens again"
chanes.

>   ftrace: Always destroy trampoline when shutting down the trace
>   ftrace: Fixup trace_selftest_ops()

These two seem to fix real bugs. I'm thinking they should go in now and
be backported via stable.

Thoughts?

-- Steve

> 
>  arch/x86/kernel/ftrace.c      | 12 ++++++++-
>  kernel/trace/ftrace.c         | 62 ++++++++++++++++++++++---------------------
>  kernel/trace/trace_selftest.c |  7 ++---
>  3 files changed, 47 insertions(+), 34 deletions(-)
>