linux-kernel - Re: [PATCH v2] smp: kernel/panic.c

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Date:   Wed, 17 Mar 2021 10:49:08 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     He Ying <heying24@...wei.com>
Cc:     peterz@...radead.org, frederic@...nel.org, paulmck@...nel.org,
        christophe.leroy@...roup.eu, clg@...d.org, qais.yousef@....com,
        johnny.chenyi@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] smp: kernel/panic.c - silence warnings


* He Ying <heying24@...wei.com> wrote:

> We found these warnings in kernel/panic.c by using sparse tool:
> warning: symbol 'panic_smp_self_stop' was not declared.
> warning: symbol 'nmi_panic_self_stop' was not declared.
> warning: symbol 'crash_smp_send_stop' was not declared.
> 
> To avoid them, add declarations for these three functions in
> include/linux/smp.h.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: He Ying <heying24@...wei.com>
> ---
> V1->V2:
> - fix some misspellings
> 
>  include/linux/smp.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/smp.h b/include/linux/smp.h
> index 70c6f6284dcf..27008a1c8111 100644
> --- a/include/linux/smp.h
> +++ b/include/linux/smp.h
> @@ -50,6 +50,14 @@ extern unsigned int total_cpus;
>  int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
>  			     int wait);
>  
> +/*
> + * Cpus stopping functions in panic. All have default weak definitions.
> + * Architecture-dependent code may override them.
> + */
> +void panic_smp_self_stop(void);
> +void nmi_panic_self_stop(struct pt_regs *regs);
> +void crash_smp_send_stop(void);

Please follow the 'extern' convention used for prototype declarations 
in that header file.

Thanks,

	Ingo