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

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Date:   Wed, 17 Mar 2021 12:00:29 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Ingo Molnar <mingo@...nel.org>, He Ying <heying24@...wei.com>
Cc:     peterz@...radead.org, frederic@...nel.org, paulmck@...nel.org,
        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



Le 17/03/2021 à 10:49, Ingo Molnar a écrit :
> 
> * 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);
> 

What do you mean ? 'extern' prototype is pointless for function prototypes and deprecated, no new 
function prototypes should be added with the 'extern' keyword.

checkpatch.pl tells you: "extern prototypes should be avoided in .h files"

Christophe