netdev - Re: [PATCH net-next] ipv6: Avoid rt6_probe() taking writer lock in the fast path

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Message-ID: <alpine.LFD.2.11.1507220716100.1851@ja.home.ssi.bg>
Date:	Wed, 22 Jul 2015 07:19:11 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	Martin KaFai Lau <kafai@...com>
cc:	netdev <netdev@...r.kernel.org>, Kernel Team <kernel-team@...com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net-next] ipv6: Avoid rt6_probe() taking writer lock in
 the fast path


	Hello,

On Tue, 21 Jul 2015, Martin KaFai Lau wrote:

> The patch checks neigh->nud_state before acquiring the writer lock.
> Note that rt6_probe() is only used in CONFIG_IPV6_ROUTER_PREF.

	Locking usage is absolutely correct.

> +		if (!(neigh->nud_state & NUD_VALID) &&
> +		    time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {

	but this line is too long...

> +			work = kmalloc(sizeof(*work), GFP_ATOMIC);
> +			if (work) {
> +				__neigh_set_probe_once(neigh);
> +			}

	scripts/checkpatch.pl --strict /tmp/file.patch

Regards

--
Julian Anastasov <ja@....bg>
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