linux-kernel - Re: [RFC v2 2/2] kernel/sysctl: support handling command line aliases

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Message-ID: <52faea3b-6442-3b1b-9404-6a018d1d1c44@suse.cz>
Date:   Wed, 25 Mar 2020 15:36:23 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-mm@...ck.org, Ivan Teterevkov <ivan.teterevkov@...anix.com>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        "Guilherme G . Piccoli" <gpiccoli@...onical.com>
Subject: Re: [RFC v2 2/2] kernel/sysctl: support handling command line aliases

On 3/25/20 3:29 PM, Michal Hocko wrote:
> Both patches look really great to me. I haven't really checked all the
> details but from a quick glance they both seem ok.

Thanks.

> I would just add a small clarification here. Unless I am mistaken
> early_param is called earlier than it would be now. But that shouldn't
> cause any problems because the underlying implementation is just a noop
> for backward compatibility.

Yeah, indeed worth noting somewhere explicitly. The conversion can't be done
blindly, one has to consider whether the delay compared to early_param can be a
disadvantage or not. For example the nmi_watchdog parameter is probably best
left as it is?

> Thanks a lot this looks like a very nice improvement.
> 
> On Wed 25-03-20 13:03:45, Vlastimil Babka wrote:
> [...]
>> -static __init int setup_numa_zonelist_order(char *s)
>> -{
>> -	if (!s)
>> -		return 0;
>> -
>> -	return __parse_numa_zonelist_order(s);
>> -}
>> -early_param("numa_zonelist_order", setup_numa_zonelist_order);
>> -
>>  char numa_zonelist_order[] = "Node";
>>  
>>  /*
>> -- 
>> 2.25.1
>