Fixes cross-compile to mips.

Signed-off-by: Kenneth Klette Jonassen <kenne...@ifi.uio.no>
---
Fixes build error for mips-allyesconfig:

  net/built-in.o: In function `tcp_cdg_cong_avoid':
>> tcp_cdg.c:(.text+0x217774): undefined reference to `__udivdi3'

https://lists.01.org/pipermail/kbuild-all/2015-June/010142.html
---
 net/ipv4/tcp_cdg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_cdg.c b/net/ipv4/tcp_cdg.c
index a52ce2d..8c6fd3d 100644
--- a/net/ipv4/tcp_cdg.c
+++ b/net/ipv4/tcp_cdg.c
@@ -145,7 +145,7 @@ static void tcp_cdg_hystart_update(struct sock *sk)
                return;
 
        if (hystart_detect & HYSTART_ACK_TRAIN) {
-               u32 now_us = local_clock() / NSEC_PER_USEC;
+               u32 now_us = div_u64(local_clock(), NSEC_PER_USEC);
 
                if (ca->last_ack == 0 || !tcp_is_cwnd_limited(sk)) {
                        ca->last_ack = now_us;
-- 
2.1.0

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