linux-kernel - Re: [PATCH 0/3] Livepatch module notifier cleanup

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Message-ID: <878u1rko63.fsf@rustcorp.com.au>
Date:	Thu, 10 Mar 2016 13:57:32 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jessica Yu <jeyu@...hat.com>, Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jessica Yu <jeyu@...hat.com>
Subject: Re: [PATCH 0/3] Livepatch module notifier cleanup

Jessica Yu <jeyu@...hat.com> writes:
> These are the remaining 3 patches that came from the original ftrace/livepatch
> module notifier patchset found here: https://lkml.org/lkml/2016/2/8/1180

Please add my Acked-by to the first and third.

Cheers,
Rusty.

> Basically, the patchset does a bit of module.c cleanup (patch 1 and 2) in
> preparation for the klp_module_{coming,going} calls (patch 3). We decided
> to stop relying on the module notifier callchain in favor of hard-coding
> the appropriate livepatch function calls that handle coming and going
> modules. Hard-coding these calls will guarantee that ftrace and livepatch
> exit/initialization routines are called in the correct order without
> relying on module notifiers.
>
> The patches should be nearly exactly the same as those from the previous
> discussion, except in patch 3 I've added back the #if IS_ENABLED(CONFIG_LIVEPATCH)
> guard in livepatch.h, and in patch 2 I decided that it might be safer to
> change mod->state with the module mutex held.
>
> Patches based on linux-next.
>
> Previous discussion found here: https://lkml.org/lkml/2016/2/8/1180
>
> Jessica Yu (3):
>   modules: split part of complete_formation() into prepare_coming_module()
>   modules: set mod->state to GOING before going notifiers are called
>   livepatch/module: remove livepatch module notifier
>
>  include/linux/livepatch.h |  13 +++++
>  kernel/livepatch/core.c   | 145 ++++++++++++++++++++++------------------------
>  kernel/module.c           |  39 ++++++++++---
>  3 files changed, 113 insertions(+), 84 deletions(-)
>
> -- 
> 2.4.3