linux-kernel - Re: [PATCH] nmi_backtrace: fix trigger_allbutcpu_cpu

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Date:   Mon, 7 Aug 2023 09:22:24 +0200
From:   Thorsten Leemhuis <linux@...mhuis.info>
To:     Arnd Bergmann <arnd@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Petr Mladek <pmladek@...e.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nmi_backtrace: fix trigger_allbutcpu_cpu_backtrace() stub
 definition

On 07.08.23 09:10, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The prototype for the extern declaration was changed, but the one for
> the empty stub is now missing an unused argument:
> 
> kernel/watchdog.c: In function 'watchdog_timer_fn':
> kernel/watchdog.c:521:4: error: too many arguments to function 'trigger_allbutcpu_cpu_backtrace'
>   521 |    trigger_allbutcpu_cpu_backtrace(smp_processor_id());
>       |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> In file included from kernel/watchdog.c:17:
> include/linux/nmi.h:193:20: note: declared here
>   193 | static inline bool trigger_allbutcpu_cpu_backtrace(void)
>       |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thx for this, ran into the same problem while building -next today:
https://copr-be.cloud.fedoraproject.org/results/@kernel-vanilla/next/fedora-rawhide-aarch64/06247267-next-next-all/build.log.gz

FWIW, it seems Andrew had noticed it and a fix ready:
https://lore.kernel.org/all/20230805100033.37f1df3bf720a7c21ad8980d@linux-foundation.org/

Maybe it was just not committed or something?

Ciao, Thorsten

> Fixes: 0ca1d340a231e ("nmi_backtrace: allow excluding an arbitrary CPU")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/linux/nmi.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/nmi.h b/include/linux/nmi.h
> index 7cf7801856a1b..e92e378df000f 100644
> --- a/include/linux/nmi.h
> +++ b/include/linux/nmi.h
> @@ -190,7 +190,7 @@ static inline bool trigger_all_cpu_backtrace(void)
>  {
>  	return false;
>  }
> -static inline bool trigger_allbutcpu_cpu_backtrace(void)
> +static inline bool trigger_allbutcpu_cpu_backtrace(int exclude_cpu)
>  {
>  	return false;
>  }