linux-kernel - Re: livepatch: Implement separate coming and going module notifiers

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Message-ID: <20160129150931.3a6b734e@gandalf.local.home>
Date:	Fri, 29 Jan 2016 15:09:31 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jessica Yu <jeyu@...hat.com>
Cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Ingo Molnar <mingo@...hat.com>, live-patching@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: livepatch: Implement separate coming and going module notifiers

On Fri, 29 Jan 2016 15:04:51 -0500
Jessica Yu <jeyu@...hat.com> wrote:

> >diff --git a/kernel/module.c b/kernel/module.c
> >index 8358f46..aeabd81 100644
> >--- a/kernel/module.c
> >+++ b/kernel/module.c
> >@@ -3371,6 +3371,13 @@ static int complete_formation(struct module *mod, struct load_info *info)
> > 	mod->state = MODULE_STATE_COMING;
> > 	mutex_unlock(&module_mutex);
> >
> >+	ftrace_module_enable(mod);
> >+	err = klp_module_enable(mod);
> >+	if (err) {
> >+		ftrace_release_mod(mod);
> >+		return err;
> >+	}  
> 
> If we go this route, should we should print a big warning ("Livepatch
> couldn't patch loading module X") instead of aborting the module load
> completely? 

If anything, that should be done in klp_module_enable() not in the
module code.

-- Steve