linux-kernel - Re: [PATCHv3 1/2] sysctl/sysrq: Remove __sysrq

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Date:   Wed, 1 Apr 2020 15:41:29 +0100
From:   Dmitry Safonov <dima@...sta.com>
To:     Michael Ellerman <mpe@...erman.id.au>, linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Jiri Slaby <jslaby@...e.com>, Joe Perches <joe@...ches.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vasiliy Khoruzhick <vasilykh@...sta.com>,
        linux-serial@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCHv3 1/2] sysctl/sysrq: Remove __sysrq_enabled copy

Hi Michael,

On 4/1/20 1:22 PM, Michael Ellerman wrote:
[..]
>>  
>> +/**
>> + * sysrq_mask - Getter for sysrq_enabled mask.
>> + *
>> + * Return: 1 if sysrq is always enabled, enabled sysrq_key_op mask otherwise.
>> + */
>> +int sysrq_mask(void)
>> +{
>> +	if (sysrq_always_enabled)
>> +		return 1;
>> +	return sysrq_enabled;
>> +}
> 
> This seems to have broken several configs, when serial_core is modular, with:
> 
>   ERROR: modpost: "sysrq_mask" [drivers/tty/serial/serial_core.ko] undefined!
> 
> See:
> 
>   http://kisskb.ellerman.id.au/kisskb/buildresult/14169386/
> 
> It's also being reported by the kernelci bot:
> 
>   https://lore.kernel.org/linux-next/5e677bd0.1c69fb81.c43fe.7f7d@mx.google.com/


Thanks for reporting this,

I've reproduced it and sent a fix:
https://lkml.kernel.org/r/20200401143904.423450-1-dima@arista.com

Thanks,
          Dmitry