The tcp_mem array which contains limits on the total amount of memory
used by TCP sockets is calculated based on nr_all_pages.  On a 32 bits
x86 system, we should base this on the number of lowmem pages.
Signed-off-by: NMiquel van Smoorenburg <miquels@cistron.nl>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>