netdev - Re: [PATCH 36/38] netfilter: connlimit: use keyed locks

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Message-ID: <20140317142644.GB26584@breakpoint.cc>
Date:	Mon, 17 Mar 2014 15:26:44 +0100
From:	Florian Westphal <fw@...len.de>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	'Pablo Neira Ayuso' <pablo@...filter.org>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 36/38] netfilter: connlimit: use keyed locks

David Laight <David.Laight@...LAB.COM> wrote:
> From: Pablo Neira Ayuso
> > +#define CONNLIMIT_SLOTS	256
> > +#define CONNLIMIT_LOCK_SLOTS	32
> 
> You might want to make these explicitly unsigned to ensure
> the divisions are unsigned (so can be done with a simple mask).

I can do  this but I checked that at least on my machine gcc already
emits a 'add' instruction to reduce the hash value.
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