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

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Date:   Fri, 16 Dec 2016 15:41:59 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Josh Poimboeuf <jpoimboe@...hat.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 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.

> +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