linux-kernel - Re: [PATCHv2-next 1/3] sysctl/sysrq: Remove __sysrq

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Message-ID: <eef8e82a-c254-9391-506b-c9de8e52ee0f@arista.com>
Date:   Sun, 23 Feb 2020 12:08:23 +0000
From:   Dmitry Safonov <dima@...sta.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Dmitry Safonov <0x7f454c46@...il.com>,
        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: [PATCHv2-next 1/3] sysctl/sysrq: Remove __sysrq_enabled copy


On 1/15/20 12:36 PM, Greg Kroah-Hartman wrote:
> On Tue, Jan 14, 2020 at 05:19:10PM +0000, Dmitry Safonov wrote:
[..]
>> +int sysrq_get_mask(void)
>> +{
>> +	if (sysrq_always_enabled)
>> +		return 1;
>> +	return sysrq_enabled;
>> +}
> 
> Naming is hard.  And this name is really hard to understand.

Agree.


> Traditionally get/put are used for incrementing reference counts.  You
> don't have a sysrq_put_mask() call, right?  :)

Yes, fair point


> I think what you want this function to do is, "is sysrq enabled right
> now" (hint, it's a global function, add kernel-doc to it so we know what
> it does...).  If so, it should maybe be something like:
> 
> 	bool sysrq_is_enabled(void);
> 
> which to me makes more sense.

Err, not exactly: there is a function for that which is sysrq_on().
But for sysctl the value of the mask (or 1 for always_enabled) is
actually needed to show a proper value back to the userspace reader.

Thanks,
          Dmitry