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

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Message-ID: <87r27wrzcw.fsf@xmission.com>
Date:   Fri, 14 Jun 2019 09:54:55 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Arnd Bergmann <arnd@...db.de>
Cc:     David Ahern <dsahern@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        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

Arnd Bergmann <arnd@...db.de> writes:

> 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.

Which reminds me.  I really need to write the patch to remove
CONFIG_SYSCTL_SYSCALL.

Unless I have missed something we have finally reached default off in
all of the distributions so no one should care.

Eric