num_possible_cpus() usage in iptables

[David S. Miller]

From: Eric Dumazet <dada1 at cosmosbay.com>
Date: Mon, 10 Oct 2005 08:23:27 +0200

> My previous patch ([PATCH 3/3] netfilter : 3 patches to boost ip_tables 
> performance) addressed this problem.
> 
> http://marc.theaimsgroup.com/?l=linux-netdev&m=112733887410796&w=2

Long term this is the kind of thing we should be doing.

But for 2.6.14, I would like to suggest that we revert back
to using NR_CPUS as that is the simplest fix for this bug.

I even spent part of this afternoon investigating other kinds of
fixes, and all of them have possible non-trivial regressions.

Yes, using NR_CPUS wastes a lot of ram, but it fixes this
bug in a straightforward and easy to verify fashion.

Comments?