linux-kernel - Re: [PATCH 1/1 linux-next] ieee802154: add __init to lowpan_frags_sysctl

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Date:	Wed, 1 Oct 2014 06:36:49 +0200 (CEST)
From:	Fabian Frederick <fabf@...net.be>
To:	Alexander Aring <alex.aring@...il.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-wpan@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/1 linux-next] ieee802154: add __init to
 lowpan_frags_sysctl_register



> On 01 October 2014 at 02:25 Alexander Aring <alex.aring@...il.com> wrote:
>
>
> Hi,
>
> On Tue, Sep 30, 2014 at 10:34:08PM +0200, Fabian Frederick wrote:
> > lowpan_frags_sysctl_register is only called by __init lowpan_net_frag_init
> > (part of the lowpan module).
> >
> > Signed-off-by: Fabian Frederick <fabf@...net.be>
> > ---
> > This is untested.
> >
> >  net/ieee802154/reassembly.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/net/ieee802154/reassembly.c b/net/ieee802154/reassembly.c
> > index 32755cb..30ec608 100644
> > --- a/net/ieee802154/reassembly.c
> > +++ b/net/ieee802154/reassembly.c
> > @@ -485,7 +485,7 @@ static void __net_exit
> > lowpan_frags_ns_sysctl_unregister(struct net *net)
> > 
> >  static struct ctl_table_header *lowpan_ctl_header;
> > 
> > -static int lowpan_frags_sysctl_register(void)
> > +static int __init lowpan_frags_sysctl_register(void)
>
> yes right, but there is more lacks of missing "__init". See below.
>
> >  {
> >     lowpan_ctl_header = register_net_sysctl(&init_net,
> >                                             "net/ieee802154/6lowpan",
> > @@ -498,7 +498,7 @@ static void lowpan_frags_sysctl_unregister(void)
> >     unregister_net_sysctl_table(lowpan_ctl_header);
> >  }
> >  #else
> > -static inline int lowpan_frags_ns_sysctl_register(struct net *net)
> > +static inline int __init lowpan_frags_ns_sysctl_register(struct net *net)
>
> This is wrong, it's callback from "struct pernet_operations lowpan_frags_ops".
>
> >  {
> >     return 0;
> >  }
>
>
> Your patch adds "__init" now for two different functions and we have
> two different declarations for these functions, depends if CONFIG_SYSCTL is
> enabled.
>
> Now if CONFIG_SYSCTL select we have as lowpan_frags_sysctl_register
> declaration:
>
> static int __init lowpan_frags_sysctl_register(void)
>
> if not:
>
> static inline int lowpan_frags_sysctl_register(void)
>
> Same for lowpan_frags_ns_sysctl_register and vice versa for CONFIG_SYSCTL.
>
> Your changes are for two different functions (Don't know if you realized
> that):

Hi Alexander,

    I didn't see _ns_ . I'll send the right fix based on wpan-next.

Thanks,
Fabian


>
> "lowpan_frags_sysctl_register" and "lowpan_frags_ns_sysctl_register",
> which makes no sense. Also lowpan_frags_ns_sysctl_register isn't called
> by module init which is wrong.
>
>
> To make "correct" cleanup for this "__init" should be add to the functions,
> for
> both declarations if CONFIG_SYSCTL is set or not:
>
>  - lowpan_net_frag_init
>  - lowpan_frags_sysctl_register
>
>
> I see now it's already applied, David please revert this change. Are you
> fine to apply a correct version of this to wpan-next tree, next time?
>
> - Alex
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