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Date: Wed, 28 Aug 2013 18:32:19 -0700
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Joe Perches <joe@...ches.com>
Cc: Tim Gardner <tim.gardner@...onical.com>, 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>
Subject: Re: [PATCH net-next 1/1] net: neighbour: Simplify ifdefs around neigh_app_ns()
Joe Perches <joe@...ches.com> writes:
> On Wed, 2013-08-28 at 13:09 -0600, Tim Gardner wrote:
>> On 08/28/2013 12:51 PM, Joe Perches wrote:
>> > On Wed, 2013-08-28 at 12:24 -0600, Tim Gardner wrote:
>> >> Drop a couple of ifdef/endif pairs by moving the ifdef
>> >> surrounding neigh_app_ns() to the interior of neigh_app_ns().
>> > []
>> >> This is an admittedly trivial change. I stumbled on it while trying to figure
>> >> out why Ubuntu doesn't have CONFIG_ARPD enabled.
>
>> > I'd be more inclined to make neigh_app_ns static inline
>> > in the .h file and remove the EXPORT_SYMBOL
>
>> I thought about that as well, but then you'd have to extern
>> __neigh_notify(), which is currently a static function and large enough
>> to not really be suitable for inlining. Seems like unnecessary churn to me.
>
> Hi Tim.
>
> As is, this makes the call to neight_app_ns
> impossible to optimize away.
>
> Perhaps this:
>
> (this does add a possibly unused neigh_notify as a global symbol)
>
> Rename __neigh_notify to neigh_notify and make public
> Add static inline neigh_app_ns
> Remove #ifdefs around use of neigh_app_ns
Again. Why not just remove CONFIG_ARPD entirely? A config option to
compile out a single line of code seems like a real waste.
Eric
> ---
>
> Compile tested only
>
> include/net/neighbour.h | 10 +++++++++-
> net/core/neighbour.c | 15 +++------------
> net/ipv4/arp.c | 2 --
> net/ipv6/ndisc.c | 2 --
> 4 files changed, 12 insertions(+), 17 deletions(-)
>
> diff --git a/include/net/neighbour.h b/include/net/neighbour.h
> index 536501a..a08b0a7 100644
> --- a/include/net/neighbour.h
> +++ b/include/net/neighbour.h
> @@ -249,7 +249,15 @@ static inline struct net *pneigh_net(const struct pneigh_entry *pneigh)
> return read_pnet(&pneigh->net);
> }
>
> -void neigh_app_ns(struct neighbour *n);
> +void neigh_notify(struct neighbour *n, int type, int flags);
> +
> +static inline void neigh_app_ns(struct neighbour *n)
> +{
> +#ifdef CONFIG_ARPD
> + neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
> +#endif
> +}
> +
> void neigh_for_each(struct neigh_table *tbl,
> void (*cb)(struct neighbour *, void *), void *cookie);
> void __neigh_for_each_release(struct neigh_table *tbl,
> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
> index 60533db..6ec5f86 100644
> --- a/net/core/neighbour.c
> +++ b/net/core/neighbour.c
> @@ -50,7 +50,6 @@ do { \
> #define PNEIGH_HASHMASK 0xF
>
> static void neigh_timer_handler(unsigned long arg);
> -static void __neigh_notify(struct neighbour *n, int type, int flags);
> static void neigh_update_notify(struct neighbour *neigh);
> static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
>
> @@ -103,7 +102,7 @@ static void neigh_cleanup_and_release(struct neighbour *neigh)
> if (neigh->parms->neigh_cleanup)
> neigh->parms->neigh_cleanup(neigh);
>
> - __neigh_notify(neigh, RTM_DELNEIGH, 0);
> + neigh_notify(neigh, RTM_DELNEIGH, 0);
> neigh_release(neigh);
> }
>
> @@ -2215,7 +2214,7 @@ nla_put_failure:
> static void neigh_update_notify(struct neighbour *neigh)
> {
> call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
> - __neigh_notify(neigh, RTM_NEWNEIGH, 0);
> + neigh_notify(neigh, RTM_NEWNEIGH, 0);
> }
>
> static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
> @@ -2735,7 +2734,7 @@ static inline size_t neigh_nlmsg_size(void)
> + nla_total_size(4); /* NDA_PROBES */
> }
>
> -static void __neigh_notify(struct neighbour *n, int type, int flags)
> +void neigh_notify(struct neighbour *n, int type, int flags)
> {
> struct net *net = dev_net(n->dev);
> struct sk_buff *skb;
> @@ -2759,14 +2758,6 @@ errout:
> rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
> }
>
> -#ifdef CONFIG_ARPD
> -void neigh_app_ns(struct neighbour *n)
> -{
> - __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
> -}
> -EXPORT_SYMBOL(neigh_app_ns);
> -#endif /* CONFIG_ARPD */
> -
> #ifdef CONFIG_SYSCTL
> static int zero;
> static int int_max = INT_MAX;
> 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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