replace nf_nat_seqofs_lock with spin_lock of nf_conn

Hi,
My kernel version is 2.6.32.
I have verify that same lock is also used in 3.4.6. there is global spin lock at net/ipv4/netfilter/nf_nat_helper.c static DEFINE_SPINLOCK(nf_nat_seqofs_lock);

this is used in following functions:
adjust_tcp_sequence();
nf_nat_get_offset();

This lock will reduce performance in case of multicore machines. There is a spin_lock in nf_conn structure itself, which is used by tcp_packet() at
net/netfilter/nf_conntrack_proto_tcp.c
and other places.

So can we replace
spin_lock_bh(&nf_nat_seqofs_lock);
with
spin_lock_bh(&ct->lock);

regards
rajesh