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

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Date:   Tue, 16 Mar 2021 15:13:16 +0800
From:   "heying (H)" <heying24@...wei.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        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

Dear Christophe and Randy,

You both are so nice. Thank you for your reply.

在 2021/3/16 14:58, Christophe Leroy 写道:
>
>
> 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
Oh, a misspelling again. Sorry about that. I'll fix it.
>
>>>
>>>
>>>> + */
>>>> +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
>>>>    */
>>>>
>>>
> .