linux-kernel - Re: [PATCH net] mpls: fix af

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Date:   Fri, 14 Jun 2019 08:10:48 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>, David Ahern <dsahern@...il.com>
Cc:     Matteo Croce <mcroce@...hat.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH net] mpls: fix af_mpls dependencies

On 6/14/19 7:26 AM, Arnd Bergmann wrote:
> On Fri, Jun 14, 2019 at 4:07 PM David Ahern <dsahern@...il.com> wrote:
>> On 6/14/19 8:01 AM, Arnd Bergmann wrote:
>>> On Wed, Jun 12, 2019 at 9:41 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>>>> On 6/11/19 5:08 PM, Matteo Croce wrote:
>>>
>>> It clearly shouldn't select PROC_SYSCTL, but I think it should not
>>> have a 'depends on' statement either. I think the correct fix for the
>>> original problem would have been something like
>>>
>>> --- a/net/mpls/af_mpls.c
>>> +++ b/net/mpls/af_mpls.c
>>> @@ -2659,6 +2659,9 @@ static int mpls_net_init(struct net *net)
>>>         net->mpls.ip_ttl_propagate = 1;
>>>         net->mpls.default_ttl = 255;
>>>
>>> +       if (!IS_ENABLED(CONFIG_PROC_SYSCTL))
>>> +               return 0;
>>> +
>>>         table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
>>>         if (table == NULL)
>>>                 return -ENOMEM;
>>>
>>
>> Without sysctl, the entire mpls_router code is disabled. So if sysctl is
>> not enabled there is no point in building this file.
> 
> Ok, I see.
> 
> There are a couple of other drivers that use 'depends on SYSCTL',
> which may be the right thing to do here. In theory, one can still
> build a kernel with CONFIG_SYSCTRL_SYSCALL=y and no
> procfs.

Yes, that makes sense.

-- 
~Randy