linux-kernel - Re: [PATCH v3 03/15] livepatch: temporary stubs for klp_patch_pending() and klp_update_patch

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Message-ID: <20161216221550.qp26jmhe3txpl6op@treble>
Date:   Fri, 16 Dec 2016 16:15:50 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Jessica Yu <jeyu@...hat.com>, Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        Vojtech Pavlik <vojtech@...e.com>, Jiri Slaby <jslaby@...e.cz>,
        Chris J Arges <chris.j.arges@...onical.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 03/15] livepatch: temporary stubs for
 klp_patch_pending() and klp_update_patch_state()

On Fri, Dec 16, 2016 at 03:41:59PM +0100, Petr Mladek wrote:
> On Thu 2016-12-08 12:08:28, Josh Poimboeuf wrote:
> > Create temporary stubs for klp_patch_pending() and
> > klp_update_patch_state() so we can add TIF_PATCH_PENDING to different
> > architectures in separate patches without breaking build bisectability.
> > 
> > Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> > ---
> >  include/linux/livepatch.h | 7 ++++++-
> >  kernel/livepatch/core.c   | 3 +++
> >  2 files changed, 9 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
> > index 9072f04..60558d8 100644
> > --- a/include/linux/livepatch.h
> > +++ b/include/linux/livepatch.h
> > @@ -123,10 +123,15 @@ void arch_klp_init_object_loaded(struct klp_patch *patch,
> >  int klp_module_coming(struct module *mod);
> >  void klp_module_going(struct module *mod);
> >  
> > +static inline bool klp_patch_pending(struct task_struct *task) { return false; }
> 
> I was curious about this. It is implemented correctly in the 13th
> patch and it is never used until 13th patch.

Yep, I'll move it to patch 13.

> 
> > +void klp_update_patch_state(struct task_struct *task);
> 
> It seems that the stub for this function is enough.
> 
> Well, the extra function is just a cosmetic problem. If it could be
> fixed, it would be great. But the patch makes sense:
> 
> Reviewed-by: Petr Mladek <pmladek@...e.com>
> 
> Best Regards,
> Petr
> 

-- 
Josh