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

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Date:   Tue, 16 Mar 2021 07:58:48 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     "heying (H)" <heying24@...wei.com>,
        Randy Dunlap <rdunlap@...radead.org>, peterz@...radead.org,
        mingo@...nel.org, frederic@...nel.org, paulmck@...nel.org,
        clg@...d.org, qais.yousef@....com
Cc:     johnny.chenyi@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] smp: kernel/panic.c - silence warnings



Le 16/03/2021 à 07:35, heying (H) a écrit :
> Thanks for your reply.
> 
> 
> 在 2021/3/16 13:15, Randy Dunlap 写道:
>> On 3/15/21 9:08 PM, He Ying 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>
>>> ---
>>>   include/linux/smp.h | 8 ++++++++
>>>   1 file changed, 8 insertions(+)
>>>
>>> diff --git a/include/linux/smp.h b/include/linux/smp.h
>>> index 70c6f6284dcf..861a253cc179 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 definations.
>>                                                                definitions.
> Sorry for my typo.
>>
>>> + * Architecure dependent code may override them.
>>        Architecture-dependent
> Is that necessary?

Sure you are missing a 't'

Architecure ==> Architecture

>>
>>
>>> + */
>>> +void panic_smp_self_stop(void);
>>> +void nmi_panic_self_stop(struct pt_regs *regs);
>>> +void crash_smp_send_stop(void);
>>> +
>>>   /*
>>>    * Call a function on all processors
>>>    */
>>>
>>