linux-kernel - Re: [PATCH v4 4/4] livepatch/module: remove livepatch module notifier

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Message-ID: <alpine.LNX.2.00.1602101133480.9853@pobox.suse.cz>
Date:	Wed, 10 Feb 2016 11:34:07 +0100 (CET)
From:	Miroslav Benes <mbenes@...e.cz>
To:	Jessica Yu <jeyu@...hat.com>
cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Petr Mladek <pmladek@...e.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>, live-patching@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/4] livepatch/module: remove livepatch module
 notifier

On Mon, 8 Feb 2016, Jessica Yu wrote:

> Remove the livepatch module notifier in favor of directly enabling and
> disabling patches to modules in the module loader. Hard-coding the
> function calls ensures that ftrace_module_enable() is run before
> klp_module_coming() during module load, and that klp_module_going() is
> run before ftrace_release_mod() during module unload. This way, ftrace
> and livepatch code is run in the correct order during the module
> load/unload sequence without dependence on the module notifier call chain.
> 
> This fixes a notifier ordering issue in which the ftrace module notifier
> (and hence ftrace_module_enable()) for coming modules was being called
> after klp_module_notify(), which caused livepatch modules to initialize
> incorrectly.
> 
> Signed-off-by: Jessica Yu <jeyu@...hat.com>
> Reviewed-by: Petr Mladek <pmladek@...e.com>
> Acked-by: Rusty Russell <rusty@...tcorp.com.au>

Reviewed-by: Miroslav Benes <mbenes@...e.cz>

Miroslav