linux-kernel - Re: [PATCH v14 05/11] livepatch: Simplify API by removing registration step

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Date:   Thu, 6 Dec 2018 09:28:14 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Joe Lawrence <joe.lawrence@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Jason Baron <jbaron@...mai.com>,
        Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v14 05/11] livepatch: Simplify API by removing
 registration step

On Wed 2018-12-05 14:32:53, Joe Lawrence wrote:
> > diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> > index 972520144713..e01dfa3b58d2 100644
> > --- a/kernel/livepatch/core.c
> > +++ b/kernel/livepatch/core.c
> > @@ -45,7 +45,7 @@
> >   */
> >  DEFINE_MUTEX(klp_mutex);
> >  
> > -/* Registered patches */
> > +/* Actively used patches. */
> >  LIST_HEAD(klp_patches);
> 
> By itself, this comment makes me wonder if there are un-active and/or
> un-used patches that I need to worry about.  After this patchset,
> klp_patches will include patches that have been enabled and those that
> have been replaced, but the replacement transition is still in progress.  
> 
> If that sounds accurate, how about adding to the comment:
> 
> /* Actively used patches: enabled or replaced and awaiting transition */

The replaced patches are not in the list. This is why I used the word
"actively".

/*
 * Actively used patches: enabled or in transition. Note that replaced
 * or disabled patches are not listed even though the related kernel
 * module still can be loaded.
 */

Best Regards,
Petr