linux-kernel - Re: [PATCH v2 1/6] panic: Separate sysctl logic from CONFIG

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Date:   Wed, 9 Nov 2022 13:48:45 -0800
From:   Bill Wendling <morbo@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jann Horn <jannh@...gle.com>, Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        tangmeng <tangmeng@...ontech.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Seth Jenkins <sethjenkins@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Arnd Bergmann <arnd@...db.de>, Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        David Gow <davidgow@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Huang Ying <ying.huang@...el.com>,
        Anton Vorontsov <anton@...msg.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 1/6] panic: Separate sysctl logic from CONFIG_SMP

On Wed, Nov 9, 2022 at 12:01 PM Kees Cook <keescook@...omium.org> wrote:
>
> In preparation for adding more sysctls directly in kernel/panic.c, split
> CONFIG_SMP from the logic that adds sysctls.
>
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: tangmeng <tangmeng@...ontech.com>
> Cc: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
> Cc: Tiezhu Yang <yangtiezhu@...ngson.cn>
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  kernel/panic.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/panic.c b/kernel/panic.c
> index da323209f583..129936511380 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -75,8 +75,9 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
>
>  EXPORT_SYMBOL(panic_notifier_list);
>
> -#if defined(CONFIG_SMP) && defined(CONFIG_SYSCTL)
> +#if CONFIG_SYSCTL

Should this be "#ifdef CONFIG_SYSCTL"?

>  static struct ctl_table kern_panic_table[] = {
> +#if defined(CONFIG_SMP)

nit: This could be "#ifdef CONFIG_SMP"

>         {
>                 .procname       = "oops_all_cpu_backtrace",
>                 .data           = &sysctl_oops_all_cpu_backtrace,
> @@ -86,6 +87,7 @@ static struct ctl_table kern_panic_table[] = {
>                 .extra1         = SYSCTL_ZERO,
>                 .extra2         = SYSCTL_ONE,
>         },
> +#endif
>         { }
>  };
>
> --
> 2.34.1
>