linux-kernel - Re: [PATCH 2/2] ftrace: Adjust priority of ftrace module notifier

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Message-ID: <20160129104950.041f7522@gandalf.local.home>
Date:	Fri, 29 Jan 2016 10:49:50 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Jessica Yu <jeyu@...hat.com>, Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Ingo Molnar <mingo@...hat.com>, live-patching@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ftrace: Adjust priority of ftrace module notifier

On Fri, 29 Jan 2016 09:45:05 -0600
Josh Poimboeuf <jpoimboe@...hat.com> wrote:


> If we do that then I still think it would be a good idea to split up the
> livepatch notifiers, with:
> 
> - INT_MAX-1 for coming so that relocations are all written before any
>   other notifiers (besides ftrace) get a chance to run.
> 
> - INT_MIN-1 for going.  I don't have a good specific reason, but I think

Do you mean INT_MIN+1 ?

-- Steve

>   the symmetry will create less surprises and possibly fewer bugs if the
>   module's patched state as seen by the other notifiers is the same for
>   coming and going.
>