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

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Message-ID: <alpine.LNX.2.00.1602160033090.22727@cbobk.fhfr.pm>
Date:	Tue, 16 Feb 2016 00:42:25 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Jessica Yu <jeyu@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Vojtech Pavlik <vojtech@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Petr Mladek <pmladek@...e.com>,
	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, 15 Feb 2016, Josh Poimboeuf wrote:

> So I think the commit causing the regression is 5156dca34a3e, which
> occurred in the 4.5 cycle, *not* in 4.4.

Agreed, by "4.4 regresion" I mean "regression compared to 4.4"; i.e. 
regression that will become real issue once 4.5 is released.

> Also it's my understanding that only the third patch ("remove ftrace 
> module notifier") is needed to fix the regression, and the other patches 
> are just general improvements.  So if needed I think we can just rebase 
> that patch (which already has Rusty's ack I believe) and send it to 
> Linus now.

3/4 and 4/4 are be sufficient, yes (although I'd like to have this 
confimed by Jessica, as she apparently already has a reliable testcase).

To be honest: I was skiing (and being offline) thursday - sunday :), so my 
original plan was to get Ack from Rusty in the meantime, and then send 
pull request to Linus once I am back on sunday evening.

This is not going to happen, so we have to start with plan B (which is 
pushing just 3/4 and 4/4). Jessica, could you please send me updated (and 
tested on your side) patchset with module.c cleanups omitted?

Steven, I'd appreciate if you could tell me whether your Ack to 
"ftrace/module: remove ftrace module notifier" still holds even if 
module.c changes are not happening.

Thanks,

-- 
Jiri Kosina
SUSE Labs