netdev - Re: [PATCH net-next 2/2] net: initialize hashrnd in flow_dissector with net_get_random

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Message-ID: <1382536714.7572.18.camel@edumazet-glaptop.roam.corp.google.com>
Date:	Wed, 23 Oct 2013 06:58:34 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com
Subject: Re: [PATCH net-next 2/2] net: initialize hashrnd in flow_dissector
 with net_get_random_once

On Wed, 2013-10-23 at 13:12 +0200, Hannes Frederic Sowa wrote:
> We also can defer the initialization of hashrnd in flow_dissector
> to its first use. Since net_get_random_once is irqsave now we don't
> have to audit the call paths if one of this functions get called by an
> interrupt handler.
> 
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> ---

This really works well if CONFIG_JUMP_LABEL=y

I am afraid some arches do not really have this.



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