linux-kernel - Re: [PATCH net-next 1/1] net: neighbour: Simplify ifdefs around neigh_app

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Message-ID: <8761upbd6h.fsf@xmission.com>
Date:	Wed, 28 Aug 2013 16:36:38 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Tim Gardner <tim.gardner@...onical.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Gao feng <gaofeng@...fujitsu.com>,
	Joe Perches <joe@...ches.com>
Subject: Re: [PATCH net-next 1/1] net: neighbour: Simplify ifdefs around neigh_app_ns()

Tim Gardner <tim.gardner@...onical.com> writes:

> Drop a couple of ifdef/endif pairs by moving the ifdef
> surrounding neigh_app_ns() to the interior of neigh_app_ns().

Can we please just remove the CONFIG_ARPD option entirely.

There really is no savings to keeping this option configurable and the
option only removes a netlink notification.

> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
> Cc: James Morris <jmorris@...ei.org>
> Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
> Cc: Patrick McHardy <kaber@...sh.net>
> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
> Cc: Gao feng <gaofeng@...fujitsu.com>
> Cc: Joe Perches <joe@...ches.com>
> Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
> ---
>
> This is an admittedly trivial change. I stumbled on it while trying to figure
> out why Ubuntu doesn't have CONFIG_ARPD enabled.
>
>  net/core/neighbour.c |    4 ++--
>  net/ipv4/arp.c       |    2 --
>  net/ipv6/ndisc.c     |    2 --
>  3 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
> index 60533db..049dd9e 100644
> --- a/net/core/neighbour.c
> +++ b/net/core/neighbour.c
> @@ -2759,13 +2759,13 @@ errout:
>  		rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
>  }
>  
> -#ifdef CONFIG_ARPD
>  void neigh_app_ns(struct neighbour *n)
>  {
> +#ifdef CONFIG_ARPD
>  	__neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
> +#endif /* CONFIG_ARPD */
>  }
>  EXPORT_SYMBOL(neigh_app_ns);
> -#endif /* CONFIG_ARPD */
>  
>  #ifdef CONFIG_SYSCTL
>  static int zero;
> diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
> index 4429b01..7808093 100644
> --- a/net/ipv4/arp.c
> +++ b/net/ipv4/arp.c
> @@ -368,9 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
>  	} else {
>  		probes -= neigh->parms->app_probes;
>  		if (probes < 0) {
> -#ifdef CONFIG_ARPD
>  			neigh_app_ns(neigh);
> -#endif
>  			return;
>  		}
>  	}
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index 04d31c2..d5693ad 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -663,9 +663,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
>  		}
>  		ndisc_send_ns(dev, neigh, target, target, saddr);
>  	} else if ((probes -= neigh->parms->app_probes) < 0) {
> -#ifdef CONFIG_ARPD
>  		neigh_app_ns(neigh);
> -#endif
>  	} else {
>  		addrconf_addr_solict_mult(target, &mcaddr);
>  		ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
--
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