linux-kernel - Re: [RFC PATCH 2/9] livepatch: separate enabled and patched states

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Message-ID: <20150210172138.GG21643@treble.redhat.com>
Date:	Tue, 10 Feb 2015 11:21:38 -0600
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Seth Jennings <sjenning@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/9] livepatch: separate enabled and patched states

On Tue, Feb 10, 2015 at 05:44:30PM +0100, Jiri Slaby wrote:
> On 02/09/2015, 06:31 PM, Josh Poimboeuf wrote:
> > Once we have a consistency model, patches and their objects will be
> > enabled and disabled at different times.  For example, when a patch is
> > disabled, its loaded objects' funcs can remain registered with ftrace
> > indefinitely until the unpatching operation is complete and they're no
> > longer in use.
> > 
> > It's less confusing if we give them different names: patches can be
> > enabled or disabled; objects (and their funcs) can be patched or
> > unpatched:
> > 
> > - Enabled means that a patch is logically enabled (but not necessarily
> >   fully applied).
> > 
> > - Patched means that an object's funcs are registered with ftrace and
> >   added to the klp_ops func stack.
> > 
> > Also, since these states are binary, represent them with boolean-type
> > variables instead of enums.
> 
> So please do so: we have bool/true/false.

Will do, thanks.

-- 
Josh
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