From: Petr Mladek <pmladek@suse.com>
To: Miroslav Benes <mbenes@suse.cz>
Cc: Jessica Yu <jeyu@redhat.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Seth Jennings <sjenning@redhat.com>,
Jiri Kosina <jikos@kernel.org>, Vojtech Pavlik <vojtech@suse.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
live-patching@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: livepatch/module: remove livepatch module notifier
Date: Fri, 5 Feb 2016 11:06:56 +0100 [thread overview]
Message-ID: <20160205100656.GC3305@pathway.suse.cz> (raw)
In-Reply-To: <alpine.LNX.2.00.1602051004000.25516@pobox.suse.cz>
On Fri 2016-02-05 10:15:56, Miroslav Benes wrote:
> On Thu, 4 Feb 2016, Jessica Yu wrote:
> > Argh, thank you for catching that. I think we could split up
> > complete_formation()
> > into two functions in order to make the error handling work.
> >
> > Does all this look ok?
>
> Hm, there is an another option. We can cover the needed error handling in
> complete_formation(). So for the first error there
> (verify_export_symbols() fails) we need to only release module_mutex. For
> our second error we need more. We would call module_bug_cleanup() under
> module_mutex, module_disable_{ro,nx} and going notifiers. Is this correct?
> It would be hidden in complete_formation() this way and cleaner in my
> opinion. There is some code duplication though.
This sounds better to me.
> > Also, one last thing, I noticed that module->state
> > isn't
> > set to MODULE_STATE_GOING anywhere before the going notifier chain is called
> > in
> > the bug_cleanup label (I think it is still COMING at that point), so the
> > klp_module_disable call right afterwards would have bailed out because of
> > that.
> > To be consistent, shouldn't it be set before the going notifiers are called?
>
> This could break something or introduce a race somewhere. Git grep says
> there are several checks for MODULE_STATE_GOING through out the kernel
> which need to be checked.
I think that we could relax the condition in the
klp_module_going/disable() function and allow to call it
also in MODULE_STATE_COMMING_STATE. It would deserve
a comment.
Best Regards,
Petr
next prev parent reply other threads:[~2016-02-05 10:07 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-02 1:17 [PATCH v2 0/2] Fix ordering of ftrace/livepatch calls on module load and unload Jessica Yu
2016-02-02 1:17 ` [PATCH v2 1/2] ftrace/module: remove ftrace module notifier Jessica Yu
2016-02-04 13:27 ` Petr Mladek
2016-02-04 14:18 ` Steven Rostedt
2016-02-04 15:21 ` Petr Mladek
2016-02-04 15:33 ` Steven Rostedt
2016-02-02 1:17 ` [PATCH v2 2/2] livepatch/module: remove livepatch " Jessica Yu
2016-02-04 14:39 ` Petr Mladek
2016-02-04 14:56 ` Steven Rostedt
2016-02-04 16:47 ` Miroslav Benes
2016-02-05 4:11 ` Jessica Yu
2016-02-05 9:15 ` Miroslav Benes
2016-02-05 10:06 ` Petr Mladek [this message]
2016-02-08 0:34 ` Rusty Russell
2016-02-04 17:29 ` [PATCH v2 2/2] " Miroslav Benes
2016-02-04 20:55 ` Josh Poimboeuf
2016-02-05 8:59 ` Miroslav Benes
2016-02-04 10:43 ` [PATCH v2 0/2] Fix ordering of ftrace/livepatch calls on module load and unload Jiri Kosina
2016-02-04 13:29 ` Steven Rostedt
2016-02-05 1:17 ` Rusty Russell
-- strict thread matches above, loose matches on Subject: below --
2016-02-09 4:50 [PATCH v4 0/4] " Jessica Yu
2016-02-09 4:50 ` [PATCH v4 4/4] livepatch/module: remove livepatch module notifier Jessica Yu
2016-02-09 23:43 ` Rusty Russell
2016-02-10 10:18 ` Jiri Kosina
2016-02-14 22:59 ` Jiri Kosina
2016-02-15 23:27 ` Josh Poimboeuf
2016-02-15 23:42 ` Jiri Kosina
2016-02-16 0:48 ` Jessica Yu
2016-02-16 8:41 ` Miroslav Benes
2016-02-16 19:51 ` Jessica Yu
2016-02-29 0:30 ` [PATCH v4 4/4] " Rusty Russell
2016-03-01 3:00 ` Jessica Yu
2016-03-11 20:03 [PATCH v2 0/2] Livepatch module notifier cleanup Jessica Yu
2016-03-11 20:03 ` [PATCH v2 2/2] livepatch/module: remove livepatch module notifier Jessica Yu
2016-03-14 15:06 ` Petr Mladek
2016-03-14 17:50 ` Jessica Yu
2016-03-15 9:10 ` Petr Mladek
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